Skocz do pozycji: 1.

Tytuł:

Simple analysis of the impact of packet loss and delay on voice transmission quality

Autorzy:

Perlicki, K.

Powiązania:

https://bibliotekanauki.pl/articles/309277.pdf

Data publikacji:

2002

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

E-model
packet network
packet loss
delay
transmission quality rating

Opis:

In this paper a simple analytical expression based on E-model is applied to analyse the impact of packet loss and delay on voice transmission quality. The relationship between overall transmission quality rating, packet loss and delay G.711, G.723 and G.729 codes is presented.

Źródło:

Journal of Telecommunications and Information Technology; 2002, 2; 53-56
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Oprogramowanie Herkules do obliczania parametrów wytrzymałosciowych elementów obudowy górniczej
The packet Herkules of software for calculation results of strength tests of mining support units

Autorzy:

Pacześniowski, K.

Powiązania:

https://bibliotekanauki.pl/articles/340853.pdf

Data publikacji:

2010

Wydawca:

Główny Instytut Górnictwa

Tematy:

pakiet Herkules
Herkules packet

Opis:

Przedstawiono założenia, opis oraz sposób posługiwania się programami komputerowymi zawartymi w pakiecie Herkules, które są przeznaczone do obliczania parametrów wytrzymałościowych elementów obudów górniczych, na podstawie wyników badań stanowiskowych.
Assumptions, description, as well as the way of use of computer programmes contained in Herkules packet were presented, which are designed for calculation of strength parameters of mining support units, on the basis of results of stand tests.

Źródło:

Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa; 2010, 4; 59-73
1643-7608

Pojawia się w:

Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Simulation of Package Waves

Autorzy:

Sadatian, S. Davood

Powiązania:

https://bibliotekanauki.pl/articles/1182890.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Wave Packet; Synchrotron radiation

Opis:

An important application of simulation methods in the fields of Computational Physics, Physical Chemistry and quantum chromodynamics used to perform complex calculations related to the construction of the thermal covering on a spacecraft. In this study, we tried to establish a framework of appropriate software known as Computational Physics Laboratory and simulate a propagation of waves by computer.

Źródło:

World Scientific News; 2016, 53, 3; 309-322
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

SMM Clos-Network Switches under SD Algorithm

Autorzy:

Kleban, J.
Warczyński, J.

Powiązania:

https://bibliotekanauki.pl/articles/307990.pdf

Data publikacji:

2018

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

clos-network switch
packet dispatching algorithms
packet switching networks
stability of switching network

Opis:

This paper is devoted to evaluating the performance of Space-Memory-Memory (SMM) Clos-network switches under a packet dispatching scheme employing static connection patterns, referred to as Static Dispatching (SD). The control algorithm with static connection patterns can be easily implemented in the SMM fabric due to bufferless switches in the first stage. Stability is one of the very important performance factors of packet switching nodes. In general, a switch is stable for a particular arrival process if the expected length of the packet queues does not increase without limitation. To prove the stability of the SMM Clos-network switches considered under the SD packet dispatching scheme the discrete Markov chain model of the switch is used and Foster’s criteria to extend Lyapunov’s second (direct) method of stability investigation of discrete time stochastic systems are used. The results of simulation experiments, in terms of average cell delay and packet queue lengths, are shown as well.

Źródło:

Journal of Telecommunications and Information Technology; 2018, 1; 24-31
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Analysis of The Effectiveness of Online Electronic Learning System Using Data Traffic Network Performance Management to Succeed Merdeka Learning : Merdeka Campus During the Covid-19 Pandemic

Autorzy:

Budiyanto, Setiyo
Silalahi, Lukman Medriavin
Silaban, Freddy Artadima
Sitorus, Henry Binsar Hamonangan
Rochendi, Agus Dendi
Ismail, Mochamad Furqon

Powiązania:

https://bibliotekanauki.pl/articles/2055225.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

delay
throughput
packet loss
education

Opis:

The problems in the Covid-19 pandemic have a major influence on the field of education with the use of technology to support the teaching and learning process to facilitate students who do home learning activities. The proposed concept of freedom of learning is a more comprehensive concept such as portfolio and assignments such as group assignments, writings, and so on that are done in full online by adding additional features such as Teaching and Learning Activities and Assessment through information technology media. (E-Learning / Learning Management System). The method proposed in this research is the Peer Connection Queue (PCQ) method on mikrotik operating systems. PCQ method is a program to manage network traffic in Quality of Services (QoS). Bandwidth management methods. The hypothesis formulated is to create bandwidth management with PCQ so that bandwidth sharing is automatically and evenly distributed to multi clients. Therefore, in this research finally formulated into the goal of E-Learning effectiveness analysis using bandwidth management analysis method, which will be measured and analyzed in this research is throughput, delay, jitter, and packet loss. So that the final result of this research obtained the feasibility of the teaching and learning process that is carried out effectively.

Źródło:

International Journal of Electronics and Telecommunications; 2021, 67, 4; 595--601
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Survey of Several IP Traceback Mechanisms and Path Reconstruction

Autorzy:

Rajkumar, M. Newlin
Amsarani, R.
Shiny, M. U.

Powiązania:

https://bibliotekanauki.pl/articles/1191427.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Dos attack
Packet marking
Packet logging
Probabilistic packet marking
Hash based scheme
reflector attack
ICMP
passive IP traceback
contol flooding
input debugging

Opis:

In real world the peoples having a lot of attacks troubles in the network. The unauthorized persons or hackers are use the another person’s IP address or use the attackers nearest IP address with in the area. If some kinds attacks such as DOS, DDOS attacks are create a lot of issues in network so difficult to find the spoofers or attackers. In this papper presents the Several IP Traceback Mechanism and Path Reconstruction.

Źródło:

World Scientific News; 2016, 40; 12-22
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Wpływ kontrolera TNC na opóźnienia transmisji w sieci Packet Radio
TNC Controller Influence on Transmission Delays in Packet Radio Network

Autorzy:

Zieliński, B.

Powiązania:

https://bibliotekanauki.pl/articles/156649.pdf

Data publikacji:

2011

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

sieć Packet Radio
kontroler TNC
opóźnienia transmisji
Packet Radio network
TNC controller
transmission delays

Opis:

Kontrolery TNC są układami mikroprocesorowymi, służącymi do przesyłu informacji w sieci Packet Radio. W pracy przedstawiono wyniki badań opóźnień rozpoczęcia i zakończenia transmisji w doświadczalnej sieci Packet Radio, uzyskane przy użyciu różnych typów kontrolerów TNC. Wyniki te skonfrontowano z wynikami obliczeń z wykorzystaniem wprowadzonego wcześniej analitycznego modelu kontrolera TNC. Przedstawione rozważania mogą posłużyć do oceny możliwości zastosowania kontrolerów TNC w określonych aplikacjach uwarunkowanych czasowo.
TNC controllers are microprocessor-based circuits used as network adapters for amateur Packet Radio network. They can, however, be used in other applications, e.g., remote control or telemetry. In such applications, it is often necessary to estimate transmission delays. This paper briefly presents the previously developed analytical model that allows estimating delays of transmission start and end. Calculation results obtained with this model are used as a reference point for results obtained in an experimental Packet Radio network using various types of TNC controllers. These results clearly show that the processing power of the TNC controller microprocessor has great influence on the aforementioned transmission delays. How-ever, detailed analysis of the results shows that software-dependent protocol implementation issues also influence network achievements. Thus, it requires further research using a common hardware platform with various types and versions of the software. The presented considerations can help in analysis of TNC controller application possibilities in certain time-bounded applications.

Źródło:

Pomiary Automatyka Kontrola; 2011, R. 57, nr 1, 1; 39-41
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Use of Modified Adaptive Heuristic Critic Algorithm for Novel Scheduling Mechanism in Packet-Switched Networks

Autorzy:

Jednoralski, M.
Kacprzak, T.

Powiązania:

https://bibliotekanauki.pl/articles/92909.pdf

Data publikacji:

2005

Wydawca:

Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach

Tematy:

reinforcement learning
telecommunication networks
packet scheduling

Opis:

In this paper a novel scheduling algorithm of packet selection in a switch node for transmission in a network channel, based on Reinforcement Learning and modified Adaptive Heuristic Critic is introduced. A comparison of two well known scheduling algorithms: Earliest Deadline First and Round Robin shows that these algorithms perform well in some cases, but they cannot adapt their behavior to traffic changes. Simulation studies show that novel scheduling algorithm outperforms Round Robin and Earliest Deadline First by adapting to changing of network conditions.

Źródło:

Studia Informatica : systems and information technology; 2005, 2(6); 21-34
1731-2264

Pojawia się w:

Studia Informatica : systems and information technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Light Weight Clustered Trust Sensing Mechanism for Internet of Things Network

Autorzy:

Rajendra Prasad, M.
Krishna Reddy, D.

Powiązania:

https://bibliotekanauki.pl/articles/2055236.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

internet of things
trust sensing
clustering
mobility
packet forwarding factor
malicious detection rate
packet delivery ratio

Opis:

Internet of Things (IoT) is the new research paradigm which has gained a great significance due to its widespread applicability in diverse fields. Due to the open nature of communication and control, the IoT network is more susceptible to several security threats. Hence the IoT network requires a trust aware mechanism which can identify and isolate the malicious nodes. Trust Sensing has been playing a significant role in dealing with security issue in IoT. A novel a Light Weight Clustered Trust Sensing (LWCTS) model is developed which ensures a secured and qualitative data transmission in the IoT network. Simulation experiments are conducted over the proposed model and the performance is compared with existing models. The obtained results prove the effectiveness when compared with existing approaches.

Źródło:

International Journal of Electronics and Telecommunications; 2022, 68, 1; 5--12
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Performance evaluation of the multiple output queueing switch with different buffer arrangements strategy

Autorzy:

Danilewicz, G.
Kabaciński, W.
Pleban, J.
Parniewicz, D.
Dąbrowski, P.

Powiązania:

https://bibliotekanauki.pl/articles/308008.pdf

Data publikacji:

2006

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

packet switching
switch fabric
multiple output queueing

Opis:

Performance evaluation of the multiple output queueing (MOQ) switch recently proposed by us is discussed in this paper. In the MOQ switch both the switch fabric and buffers can operate at the same speed as input and output ports. This solution does not need any speedup in the switch fabric as well as any matching algorithms between inputs and outputs. In this paper new performance measures for the proposed MOQ switch are evaluated. The simulation studies have been carried out for switches with different buffer arrangements strategy and of capacity 2×2, 4×4, 8×8, 16×16 and 32×32, and under selected traffic patterns. The simulations results are also compared with OQ switches of the same sizes.

Źródło:

Journal of Telecommunications and Information Technology; 2006, 3; 43-48
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Evaluation of a method for enumerating the most probable packet arrangements

Autorzy:

Szcześniak, I.

Powiązania:

https://bibliotekanauki.pl/articles/121700.pdf

Data publikacji:

2011

Wydawca:

Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane

Tematy:

packet networks
synchronous network
sieci pakietowe
sieć synchroniczna

Opis:

The problem of calculating routing probabilities in packet synchronous networks, such as optically-switched packet networks, involves enumerating packet arrangements. Previously we published a method for enumerating the most probable packet arrangements, and in this article we present its novel graph interpretation and evaluate the method for several stop conditions and for the Poisson and geometric probability distributions of arriving packets.

Źródło:

Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2011, 16; 147-152
2450-9302

Pojawia się w:

Scientific Issues of Jan Długosz University in Częstochowa. Mathematics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Adaptive wavelet techniques for compressing digital mammograms

Autorzy:

Bruckmann, A.
Flatscher, H.
Schell, T.
Uhl, A.

Powiązania:

https://bibliotekanauki.pl/articles/1954514.pdf

Data publikacji:

1999

Wydawca:

Politechnika Gdańska

Tematy:

wavelet compression
wavelet packet
time-varying decomposition
NSMRA
mammograms

Opis:

In this work we investigate the possible benefit of employing adaptive wavelet algorithms instead of the classical fixed pyramidal wavelet decomposition for the compression of digital mammograms. In particular, we target on adaptive wavelet packet and NSMRA decompositions. We observe that information cost function optimized wavelet packet subband structures do not offer compression performance gain in this case whereas NSMRA decompositions moderately improve the results of classical wavelet decompositions. Due to the lack of fast and reliable search algorithms fixed NSMRA decompositions need to be generated and employed for classes of similar images.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 4; 381-396
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Sleep Snoring Sound Recognition Based on Wavelet Packet Transform

Autorzy:

Ding, Li
Peng, Jianxin
Zhang, Xiaowen
Song, Lijuan

Powiązania:

https://bibliotekanauki.pl/articles/31339924.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

snoring recognition
wavelet packet transform
feature selection
machine learning

Opis:

Snoring is a typical and intuitive symptom of the obstructive sleep apnea hypopnea syndrome (OSAHS), which is a kind of sleep-related respiratory disorder having adverse effects on people’s lives. Detecting snoring sounds from the whole night recorded sounds is the first but the most important step for the snoring analysis of OSAHS. An automatic snoring detection system based on the wavelet packet transform (WPT) with an eXtreme Gradient Boosting (XGBoost) classifier is proposed in the paper, which recognizes snoring sounds from the enhanced episodes by the generalization subspace noise reduction algorithm. The feature selection technology based on correlation analysis is applied to select the most discriminative WPT features. The selected features yield a high sensitivity of 97.27% and a precision of 96.48% on the test set. The recognition performance demonstrates that WPT is effective in the analysis of snoring and non-snoring sounds, and the difference is exhibited much more comprehensively by sub-bands with smaller frequency ranges. The distribution of snoring sound is mainly on the middle and low frequency parts, there is also evident difference between snoring and non-snoring sounds on the high frequency part.

Źródło:

Archives of Acoustics; 2023, 48, 1; 3-12
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Pupils’ Opinions on Digital Systems Education Enriched by DCBLP Discourse

Autorzy:

Hapl, Lukáš
Kostolányová, Kateřina
Habiballa, Hashim

Powiązania:

https://bibliotekanauki.pl/articles/1964300.pdf

Data publikacji:

2021-09-30

Wydawca:

Wydawnictwo Adam Marszałek

Tematy:

DCBLP
digital systems
e-learning
Packet Tracer
students’ opinions

Opis:

The article presents knowledge about the modified e-learning on-line synchronous teaching of digital systems, which took place in the period of widespread closure of schools during almost the entire school year 2020/2021 at a secondary school with an IT focus. The importance of teaching digital systems in computer science and the integration of teaching into available lessons is briefly clarified. Furthermore, the content of teaching is presented, including its modification by elements of programming by DCBLP discourse and links to existing knowledge about this use from previous years. The subject of research interest will be the specific effects of changes on students’ opinions regarding the content of the subject. For this purpose, a qualitative investigation based on the design of the grounded theory will be used. The work brings partial knowledge that can serve as additional material for the determination of other research questions, hypotheses and identification of potential problems in teaching. The results show the pupils’ interest in the digital systems enriched by the programming discourse reveals the possible perception of a long time distance learning in this area.

Źródło:

The New Educational Review; 2021, 65; 200-210
1732-6729

Pojawia się w:

The New Educational Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

The Effect of Voice over IP Transmission Degradations on MAP-EM-GMM Speaker Verification Performance

Autorzy:

Maciejko, W.

Powiązania:

https://bibliotekanauki.pl/articles/177874.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

automatic speaker verification
packet loss
speech compression
voice over IP

Opis:

Despite the growing importance of packet switching systems, there is still a shortage of thorough analyses of VoIP transmission effect on speech and speaker recognition performance. Voice over IP transmission systems use packet switching. There is no guarantee of delivery. The main disadvantage of VoIP is a packet loss which has a major impact on the performance experienced by the users of the network. There are several techniques to mask the effects of a packet loss, referred to as packet loss concealment. In this study, the effect of voice transmission over IP on automatic speaker verification system performance was investigated. The analyzed system was based on MAP-EM-GMM modelling methods. Four various speech codecs of H.323 standard were investigated with special emphasis placed on the packet loss phenomenon and various packet loss concealment techniques.

Źródło:

Archives of Acoustics; 2015, 40, 3; 407-417
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Efficient Performance and Lower Complexity of Error Control Schemes for WPAN Bluetooth Networks

Autorzy:

El-Bendary, M. A. M.
El-Tokhy, M. A. R.

Powiązania:

https://bibliotekanauki.pl/articles/308324.pdf

Data publikacji:

2014

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

Bluetooth
EDR
packet loss
power efficiency
Wireless Personal Area Network

Opis:

This paper presents a new technique of reduction retransmission time by decreasing the discarded packets and combating the complexity through error control techniques. The work is based on Bluetooth, one of the most common Wireless Personal Area Network. Its early versions employ an expurgated Hamming code for error correction. In this paper, a new packet format using different error correction coding scheme and new formats for the EDR Bluetooth packets are presented. A study for the Packet Error Probability of classic and Enhanced Data Rate (EDR) packets is also presented to indicate the performance. The simulation experiments are performed over Additive White Gaussian Noise (AWGN) and Rayleigh flat-fading channels. The experimental results reveal that the proposed coding scheme for EDR packets enhances the power efficiency of the Bluetooth system and reduce the losses of EDR packets.

Źródło:

Journal of Telecommunications and Information Technology; 2014, 4; 100-107
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Token Bucket Algorithm with Modernization Techniques to avoid Congestion in DEC Protocol of WSN

Autorzy:

Mohammad, Habibulla
Krishna, K. Phani Rama
Gangadhar, Ch
Mohammed, Riazuddin

Powiązania:

https://bibliotekanauki.pl/articles/27311894.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

Packet size
Token bucket
Queue
Base station
Residual energy
congestion

Opis:

A wireless sensor system is an essential aspect in many fields. It consists of a great deal of sensor nodes. These sensor networks carry out a number of tasks, including interaction, distribution, recognition, and power supply. Data is transmitted from source to destination and plays an important role. Congestion may occur during data transmission from one node to another and also at cluster head locations. Congestion will arise as a result of either traffic division or resource allocation. Energy will be wasted due to traffic division congestion, which causes packet loss and retransmission of removed packets. As a result, it must be simplified; hence there are a few Wireless sensor networks with various protocols that will handle Congestion Control. The Deterministic Energy Efficient Clustering (DEC) protocol, which is fully based on residual energy and the token bucket method, is being investigated as a way to increase the energy efficiency. In the event of congestion, our proposal provides a way to cope with it and solves it using this method to improve lifespan of the sensor networks. Experiments in simulation show that the proposed strategy can significantly enhance lifetime, energy, throughput, and packet loss.

Źródło:

International Journal of Electronics and Telecommunications; 2023, 69, 3; 507--513
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Imitation modeling of the routing process based on fuzzy logic
Model symulacji procesu routingu opartego na logice rozmytej

Autorzy:

Lesovoy, I.
Pylypenko, G.

Powiązania:

https://bibliotekanauki.pl/articles/408625.pdf

Data publikacji:

2018

Wydawca:

Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej

Tematy:

fuzzy logic
routing
load
packet loss
logika rozmyta
obciążenie
utrata pakietów

Opis:

The paper discusses the details of modeling of the routing process according to the loading of output buffer storage. Shows the obtained dependence of the fraction of lost packets from the input intensity. It is shown that taking into account buffer occupancy increases the efficiency of their use and can significantly affect the quality of the functioning of the telecommunications network in the face of considerable.
W niniejszym artykule zostały omówione cechy symulacji procesu routingu uwzględniające nośność buforów wyjściowych napędu. Otrzymano zależność frakcji zagubionych pakietów od intensywności strumienia wejściowego. Wykazano, że uwzględnienie obciążenia bufora zwiększa efektywność ich użytkowania i może znacząco wpłynąć na wydajność sieci telekomunikacyjnej w warunkach znacznego obciążenia.

Źródło:

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2018, 8, 1; 16-19
2083-0157
2391-6761

Pojawia się w:

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Analysis of Burst Ratio in Concatenated Channels

Autorzy:

Rachwalski, J.
Papier, Z.

Powiązania:

https://bibliotekanauki.pl/articles/309539.pdf

Data publikacji:

2015

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

bursty packet loss
E-model
quality of experience
voice over IP

Opis:

Burst ratio is a parameter that quanties packet loss patterns in transmission networks. It has been dened for an end-to-end scenario, therefore burst ratio can be determined only if the characteristics of the whole transmission path are known. In this paper, the burst ratio parameter applicability to cases when the transmission path consists of a series of transmission channels with known packet loss rate and burst ratio values is extended. The paper also presents the results of simulations performed with NS2 software, demonstrating the validity of the burst ratio analysis. Consequently, the research makes it possible to determine the value of the burst ratio parameter in concatenated packet networks, which in turn supports delivering higher quality VoIP services.

Źródło:

Journal of Telecommunications and Information Technology; 2015, 4; 65-73
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Research of Typical Information Objects Traffic

Autorzy:

Goykhman, Vadim
Korganbaeva, Luiza
Ermakov, Alexey
Nikolaeva, Maria

Powiązania:

https://bibliotekanauki.pl/articles/102211.pdf

Data publikacji:

2019

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

traffic
TCP session
Netflow
packet
flows
ruch
sesja TCP
pakiety
przepływy

Opis:

The article considers network traffic as an aggregation of information flows from typical information objects, which can include apartment buildings, student campuses, office centers, sports and entertainment facilities of general use, etc. The study showed that the amount of information transferred by the TCP protocol significantly exceeds (by orders of magnitude) the amount of information transferred by the UDP protocol, which illustrates the average daily traffic graph of the amount of information transferred by the TCP and UDP protocols. The methods of traffic analysis were considered, the most significant characteristics of traffic were determined.

Źródło:

Advances in Science and Technology. Research Journal; 2019, 13, 2; 51-55
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

A Study on Packet Scheduling Algorithms for Healthcare Contents over Fifth Generation (5G) Mobile Cellular Network

Autorzy:

Ramli, Huda Adibah Mohd

Powiązania:

https://bibliotekanauki.pl/articles/1844466.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

packet scheduling
5G
flexible frame structure
transmission reliability
scalable TTI

Opis:

This paper models the downlink Fifth Generation (5G) network that supports a flexible frame structure and a shorter Round-Trip Time (RTT) for Hybrid Automatic Repeat Request (HARQ). Moreover, the design of the renowned Time Division Multiple Access (TDMA) packet scheduling algorithms is revised to allow these algorithms to support packet scheduling in the downlink 5G. Simulation results demonstrate that the Proportional Fair provides a comparable performance to the delay–aware Maximum-Largest Weighted Delay First for simultaneously providing the desired transmission reliability of the Guaranteed Bit Rate (GBR) and Non-Guaranteed Bit Rate (Non - GBR) healthcare contents whilst maximizing the downlink 5G performance.

Źródło:

International Journal of Electronics and Telecommunications; 2020, 66, 4; 729-735
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Uniqueness and Reproducibility of Trac Signatures

Autorzy:

Oida, K.

Powiązania:

https://bibliotekanauki.pl/articles/308320.pdf

Data publikacji:

2015

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

user authentication
traffic signature
HTTP stream-ing
packet capture
variance plot

Opis:

Usable user authentication is an important research topic. The traffic signature-based approach is a new authentication technology that identifies the devices used by online users based on traffic signatures, where the traffic approach has two advantages. First, users need not do any operations regarding the device identification. Second, users need not be sensitive to the privacy loss and computer theft. In this paper, an author evaluates the uniqueness and reproducibility of the signature by introducing a function that quantifies the distance between two signatures. Through number of experiments is demonstrated that the process interference approach has the advantage of generating new signatures that are sufficiently distinguishable from one another.

Źródło:

Journal of Telecommunications and Information Technology; 2015, 4; 44-53
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Towards broadband global optical and wireless networking

Autorzy:

Marciniak, M.

Powiązania:

https://bibliotekanauki.pl/articles/308934.pdf

Data publikacji:

2004

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

optical networks
wireless networks
radio-over-fibre
optical packet networks
transparent networks

Opis:

This paper presents a novel, non-conventional approach to the future optical and wireless hybrid transport network, capable of supporting dominant kinds of trac, i.e., voice/real time, wireless and packet data tracffic in a single transport network. The proposed model combines different technologies as connection and connectionless networks, optical cable and wireless (microwave/millimetre wave or optical wireless), being suitable for a variety of purposes and services in order to achieve global broadband networking features. Our new networking model contains an extension to wireless world in order to achieve mobility and personalisation of connection. From the networking point of view it consists of an upgrade of real-time traffic with the microwave modulated optical wave, in order to carry out conventional mobile wireless signals via optical fibres over long distances and without significant distortion. The whole available bandwidth can be fully exploited in the hybrid network. In the IP part of the network the quality of service (QoS) can be differentiated for various classes of packets and network reliability/survivability can be categorised for the whole hybrid network. This proposal combines complete and revolutionary shift to packet traffic with smooth evolutionary upgrades. We believe the model presented here is a powerful tool to trace the future evolution of telecommunications worldwide for the next 25 years.

Źródło:

Journal of Telecommunications and Information Technology; 2004, 3; 65-70
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Wykorzystanie analizatora tcpdump w symulatorze NS-3 do analizy ruchu w sieciach wi-fi
Using TCP DUMP Analyzer in the NS-3 Simulator for Traffic Analysis in Wifi Networks

Autorzy:

Masiukiewicz, Antoni

Powiązania:

https://bibliotekanauki.pl/articles/440126.pdf

Data publikacji:

2018

Wydawca:

Akademia Finansów i Biznesu Vistula

Tematy:

interferencje
NS-3
symulator sieciowy
analizator pakietów
interference
network simulator
packet analyzer

Opis:

Symulator NS-3 jest zaawansowanym narzędziem do analizy sieci. Pozwala na symulacje szeregu sieci bezprzewodowych i posiada rozbudowany moduł dotyczący sieci Wi-Fi. Model do przeprowadzenia analizy danego zagadnienia musi być przygotowany indywidualnie. Do pozyskania informacji na temat ruchu w sieci w trakcie symulacji możliwe jest wykorzystanie analizatora tcpdump. Jest on przydatny również dlatego, że symulator NS-3 jest w zasadzie przeznaczony do pracy w środowisku Linux, a tcpdump jest domyślnie instalowany w systemach operacyjnych Linux. W artykule przetestowano możliwość wykorzystania tcpdump przy analizie zjawiska interferencji w modelu wifi-simple-interference.
The NS-3 Simulator is a powerful tool for network analysis. It enables simulation of a number of wireless networks and has a developed module for Wi-Fi networks. In order to analyze the issue, the model must be prepared individually. To obtain information about the network traffic during the simulation it is possible to use the tcpdump packet analyzer. It is also useful because the NS-3 simulator is basically designed to work in a Linux environment, and tcpdump is installed by default on Linux operating systems. In this article, the author has tested the possibility of using tcpdump when analyzing the interference in the wifi-simple-interference model.

Źródło:

Kwartalnik Naukowy Uczelni Vistula; 2018, 1(55); 99-111
2084-4689

Pojawia się w:

Kwartalnik Naukowy Uczelni Vistula

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Speech Enhancement Based on Discrete Wavelet Packet Transform and Itakura-Saito Nonnegative Matrix Factorisation

Autorzy:

Liu, Houguang
Wang, Wenbo
Xue, Lin
Yang, Jianhua
Wang, Zhihua
Hua, Chunli

Powiązania:

https://bibliotekanauki.pl/articles/1448505.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

speech enhancement
discrete wavelet packet transform
nonnegative matrix factorisation
Itakura-Saito divergence

Opis:

Nonnegative matrix factorization (NMF) is one of the most popular machine learning tools for speech enhancement (SE). However, there are two problems reducing the performance of the traditional NMF-based SE algorithms. One is related to the overlap-and-add operation used in the short time Fourier transform (STFT) based signal reconstruction, and the other is the Euclidean distance used commonly as an objective function; these methods can cause distortion in the SE process. In order to get over these shortcomings, we propose a novel SE joint framework which combines the discrete wavelet packet transform (DWPT) and the Itakura-Saito nonnegative matrix factorisation (ISNMF). In this approach, the speech signal was first split into a series of subband signals using the DWPT. Then, the ISNMF was used to enhance the speech for each subband signal. Finally, the inverse DWPT (IDWT) was utilised to reconstruct these enhanced speech subband signals. The experimental results show that the proposed joint framework effectively enhances the performance of speech enhancement and performs better in the unseen noise case compared to the traditional NMF methods.

Źródło:

Archives of Acoustics; 2020, 45, 4; 565-572
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Heuristic algorithms for the optimization of total weighted completion time for asynchronous transmission in a packet data transmission system

Autorzy:

Piórkowski, A.
Werewka, J.
Bielecka, M.

Powiązania:

https://bibliotekanauki.pl/articles/206673.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

total weighted completion time
total cost factor
optimization
heuristic algorithms
packet transmission

Opis:

In this paper, the minimization of total weighted completion time (total cost) for asynchronous transmission in distributed systems is discussed. Special attention has been paid to the problem of message scheduling on the sender side. Messages to be sent form a queue, therefore the order in which they are to be sent has to be set. Scheduling algorithms can be chosen to optimize scheduling criteria such as total completion time or total weighted completion time. The message scheduling problem becomes complicated considerably when the transmitted data stream between the sender and the receiver is formed into packets. TheWSPT (Weighted Shortest Processing Time) scheduling rule, which orders messages according to non-decreasing length and weight ratios has been proven to be non-optimal. It has been demonstrated that the problem of minimizing the total weighted completion time is NP-hard. Here, we propose heuristic algorithms for scheduling messages and experimentally evaluate the performance of these scheduling algorithms.

Źródło:

Control and Cybernetics; 2014, 43, 4; 507-529
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Packet switch architecture with multiple output queueing

Autorzy:

Danilewicz, G.
Głąbowski, M.
Kabaciński, W.
Kleban, J.

Powiązania:

https://bibliotekanauki.pl/articles/308342.pdf

Data publikacji:

2004

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

high-speed packet switching
output queueing
buffer
switch fabric
switching node
multicast

Opis:

In this paper the new packet switch architecture with multiple output queuing (MOQ) is proposed. In this architecture the nonblocking switch fabric, which has the capacity of N _N2 N2, and output buffers arranged into N separate queues for each output, are applied. Each of N queues in one output port stores packets directed to this output only from one input. Both switch fabric and buffers can operate at the same speed as input and output ports. This solution does not need any speedup in the switch fabric as well as arbitration logic for taking decisions which packets from inputs will be transferred to outputs. Two possible switch fabric structures are considered: the centralized structure with the switch fabric located on one or several separate boards, and distributed structure with the switch fabric distributed over line cards. Buffer arrangements as separate queues with independent write pointers or as a memory bank with one pointer are also discussed. The mean cell delay and cell loss probability as performance measures for the proposed switch architecture are evaluated and compared with performance of OQ architecture and VOQ architecture. The hardware complexity of OQ, VOQ and presented MOQ are also compared. We conclude that hardware complexity of proposed switch is very similar to VOQ switch but its performance is comparable to OQ switch.

Źródło:

Journal of Telecommunications and Information Technology; 2004, 4; 76-83
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Prediction of Psychoacoustic Metrics Using Combination of Wavelet Packet Transform and an Optimized Artificial Neural Network

Autorzy:

Pourseiedrezaei, Mehdi
Loghmani, Ali
Keshmiri, Mehdi

Powiązania:

https://bibliotekanauki.pl/articles/177762.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

sound quality measurement
psychoacoustic metrics
wavelet packet transform
optimized artificial neural network

Opis:

In this paper, a modified sound quality evaluation (SQE) model is developed based on combination of an optimized artificial neural network (ANN) and the wavelet packet transform (WPT). The presented SQE model is a signal processing technique, which can be implemented in current microphones for predicting the sound quality. The proposed method extracts objective psychoacoustic metrics including loudness, sharpness, roughness, and tonality from sound samples, by using a special selection of multi-level nodes of the WPT combined with a trained ANN. The model is optimized using the particle swarm optimization (PSO) and the back propagation (BP) algorithms. The obtained results reveal that the proposed model shows the lowest mean square error and the highest correlation with human perception while it has the lowest computational cost compared to those of the other models and software.

Źródło:

Archives of Acoustics; 2019, 44, 3; 561-573
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Traffic type influence on performance of OSPF QoS routing

Autorzy:

Czarkowski, M.
Kaczmarek, S.
Wolff, M.

Powiązania:

https://bibliotekanauki.pl/articles/307682.pdf

Data publikacji:

2013

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

DiffServ
exponential traffic
network performance
OSPF routing
packet networks
QoS
self-similar traffic

Opis:

Feasibility studies with QoS routing proved that the network traffic type has influence on routing performance. In this work influence of self-similar traffic for network with DiffServ architecture and OSPF QoS routing has been verified. Analysis has been done for three traffic classes. Multiplexed On-Off model was used for self-similar traffic generation. Comparison of simulation results was presented using both relative and non-relative measures for three traffic classes. Results were commented and analyzed. The basic conclusion is that performance for streaming and best-effort class for self-similar traffic is higher than performance for the same class with exponential traffic (Poisson). The other important conclusion is relation between performance differences and offered traffic amount.

Źródło:

Journal of Telecommunications and Information Technology; 2013, 3; 19-28
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Methods for evaluation packet delay distribution of flows using Expedited Forwarding PHB

Autorzy:

Kaczmarek, S.
Narloch, M.

Powiązania:

https://bibliotekanauki.pl/articles/308193.pdf

Data publikacji:

2004

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

packet delay distribution
Expedited Forwarding PHB
differentiated services
Service Level Specification
IP QoS

Opis:

The paper regards problem of providing statistical performance guarantees for real-time flows using Expedited Forwarding Per Hop Behavior (EF PHB) in IP Differentiated Services networks. Statistical approach to EF flows performance guarantees, based on calculation of probability that end-to-end packet delay is larger than certain value, allows larger network utilization than previously proposed deterministic approach. In the paper different methods of packet delay distribution evaluation are presented and compared. Considered cases comprise evaluation of delay distribution models for the core network and evaluation of end-to-end packet delay in the network consisted of edge node and chain of core nodes. Results obtained with aid of analytical models are compared with simulation results.

Źródło:

Journal of Telecommunications and Information Technology; 2004, 2; 29-37
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Dekompozycja falkowa profilu powierzchni obrobionej po toczeniu
Wavelet packet decomposition of turned surface profile

Autorzy:

Zawada-Tomkiewicz, A.

Powiązania:

https://bibliotekanauki.pl/articles/156457.pdf

Data publikacji:

2009

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

powierzchnia obrobiona
dekompozycja metodą pakietów falkowych
entropia
machined surface
wavelet packet decomposition
entropy

Opis:

Powierzchnię obrobioną po toczeniu można scharakteryzować jako zbiór różnych składowych częstotliwości. Jedną z metod opisu tego typu powierzchni jest dekompozycja przy zastosowaniu transformaty pakietów falkowych. Celem pracy była optymalizacja struktury drzewa uzyskanych metodą pakietów falkowych dla dekompozycji profilu powierzchni obrobionej. Dokonano rozdziału sygnału profilu dla 1480 przypadków różnych profili powierzchni i uogólniono statystycznie dobór najlepszego drzewa.
The optimisation of wavelet packets tree structure for turned surface decomposition is the aim of the work. The machined surface after the process of turning is characterised by the set of irregularities left by tool wedge pass. Tool geometry, feed rate and tool chipping are the basic factors influencing the surface features [1, 2]. The machined surface profile can be described by a continuous spectrum of wavelength. The information about the tool chipping and other maladjustments is contained in higher frequency components [3, 4, 5]. One of the techniques of machined surface profile decomposition is a wavelet packet transform. It enables to select the appropriate wavelet function and, simultaneously, to perform deep and complete analysis [6, 7, 8]. The wavelet packet decomposition was performed with use of the Coiflet wavelet function. The previous investigations had confirmed the usefulness of this wavelet function for the turned surface description [8]. For 1480 different machined surface profiles the best tree was statistically elaborated with use of the entropy criterion [10, 11, 12]. The discrete wavelet transform tree was indicated to be optimal for 69% machined surface profile decompositions. The completion of this tree with additional detail vectors enabled the analysis to be more thorough. The statistically optimal tree contained 97% optimal subtrees (Tab. 1.) and was treated as an optimal one.

Źródło:

Pomiary Automatyka Kontrola; 2009, R. 55, nr 4, 4; 243-246
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Wavelet Packet Transform based Speech Enhancement via Two-Dimensional SPP Estimator with Generalized Gamma Priors

Autorzy:

Sun, P.
Qin, J.

Powiązania:

https://bibliotekanauki.pl/articles/177782.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

speech enhancement
speech presence probability
wavelet packet transform
two-dimensional Teager energy operator

Opis:

Despite various speech enhancement techniques have been developed for different applications, existing methods are limited in noisy environments with high ambient noise levels. Speech presence probability (SPP) estimation is a speech enhancement technique to reduce speech distortions, especially in low signalto-noise ratios (SNRs) scenario. In this paper, we propose a new two-dimensional (2D) Teager-energyoperators (TEOs) improved SPP estimator for speech enhancement in time-frequency (T-F) domain. Wavelet packet transform (WPT) as a multiband decomposition technique is used to concentrate the energy distribution of speech components. A minimum mean-square error (MMSE) estimator is obtained based on the generalized gamma distribution speech model in WPT domain. In addition, the speech samples corrupted by environment and occupational noises (i.e., machine shop, factory and station) at different input SNRs are used to validate the proposed algorithm. Results suggest that the proposed method achieves a significant enhancement on perceptual quality, compared with four conventional speech enhancement algorithms (i.e., MMSE-84, MMSE-04, Wiener-96, and BTW).

Źródło:

Archives of Acoustics; 2016, 41, 3; 579-590
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Tunnelling effects of a Gaussian wave packet impinging on a barrier

Autorzy:

Papadopoulos, George J.

Powiązania:

https://bibliotekanauki.pl/articles/1954608.pdf

Data publikacji:

2020

Wydawca:

Politechnika Gdańska

Tematy:

quantum tunnelling
Gaussiam wave packet
potential barrier
tunelowanie kwantowe
fale Gaussama
potencjalna bariera

Opis:

A general procedure based on momentum-like quantity provides the reflection and transmission amplitudes for a given barrier sandwiched by semiconductor reservoirs is presented. Furthermore, the evolution of the wave function stemming from an initial Gaussian wave packet located on the left hand side of the barrier with ignorable barrier overlap is obtained. The evolving wave function enables obtaining the associated probability and current densities space and time-wise. As application, the case of smooth double barrier is considered. The numerical results exhibit similar picture as obtained via propagator in the limited case of square barrier, e.g. repeated current density reversal at the barrier entrance, while being unidirectional at the exit. Presently, the treatment takes account of any barrier, inclusive of applied voltage. The basic quantity required is the value of the momentum-like quantity at the barrier entrance, which is obtained solving a Riccati equation governing the quantity, in question, whose value is known at the barrier exit in terms of the carrier energy and applied bias.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2020, 24, 1; 83-91
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Burst Ratio in Concatenated Markov-based Channels

Autorzy:

Rachwalski, J.
Papir, Z.

Powiązania:

https://bibliotekanauki.pl/articles/307592.pdf

Data publikacji:

2014

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

burst ratio
bursty packet loss
E-Model
quality of service
voice over IP

Opis:

This paper deals with the burst ratio parameter, which describes the burstiness of a packet loss observed in digital networks. It is one of the input parameters of E-model – the most widely used method of assessing conversational quality of telephony. The burst ratio is defined for one channel scenario so it can be calculated when the whole transmission path has been characterized by a single set of parameters. The main objective of the paper is to extend the burst ratio definition when the transmission path is defined as a tandem concatenation of transmission channels being described by their individual burst ratios. It is assumed that packet loss of a single channel is described by a 2-state Markov chain. The final result of the research is an equation describing the burst ratio parameter when the transmission path consists of multiple concatenated channels. The derived formula has been validated by extensive simulations.

Źródło:

Journal of Telecommunications and Information Technology; 2014, 1; 3-9
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

A Rattle Signal Denoising and Enhancing Method Based on Wavelet Packet Decomposition and Mathematical Morphology Filter for Vehicle

Autorzy:

Liang, Linyuan
Chen, Shuming
Li, Peiran

Powiązania:

https://bibliotekanauki.pl/articles/2141688.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

rattle signals
wavelet packet decomposition
mathematical morphology filter
critical frequency band
information entropy

Opis:

Buzz, squeak and rattle (BSR) noise has become apparent in vehicles due to the significant reductions in engine noise and road noise. The BSR often occurs in driving condition with many interference signals. Thus, the automatic BSR detection remains a challenge for vehicle engineers. In this paper, a rattle signal denoising and enhancing method is proposed to extract the rattle components from in-vehicle background noise. The proposed method combines the advantages of wavelet packet decomposition and mathematical morphology filter. The critical frequency band and the information entropy are introduced to improve the wavelet packet threshold denoising method. A rattle component enhancing method based on multi-scale compound morphological filter is proposed, and the kurtosis values are introduced to determine the best parameters of the filter. To examine the feasibility of the proposed algorithm, synthetic brake caliper rattle signals with various SNR ratios are prepared to verify the algorithm. In the validation analysis, the proposed method can well remove the disturbance background noise in the signal and extract the rattle components with well SNR ratios. It is believed that the algorithm discussed in this paper can be further applied to facilitate the detection of the vehicle rattle noise in industry.

Źródło:

Archives of Acoustics; 2022, 47, 1; 43-55
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

All-Optical Techniques Enabling Packet Switching with Label Processing and Label Rewriting

Autorzy:

Jung, H.
Llorente, J. H.
Tangdiongga, E.
Koonen, T.
Dorren, H.

Powiązania:

https://bibliotekanauki.pl/articles/308821.pdf

Data publikacji:

2009

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

label processor
optical flip-flop memory
optical packet switching
optical signal processing
wavelength converter

Opis:

Scalability of packet switched cross-connects that utilize all-optical signal processing is a crucial issue that eventually determines the future role of photonic signal processing in optical networks. After reviewing several labeling techniques, we discuss label stacking and label swapping techniques and their benefits for scalable optical packet switched nodes. All-optical devices for implementing the packet switch based on the labeling techniques will be described. Finally, we present a 1×4 all-optical packet switch based on label swapping technique that utilizes a scalable and asynchronous label processor and label rewriter. Error-free operation indicates a potential utilization of the swapping technique in a multihop packet-switched network.

Źródło:

Journal of Telecommunications and Information Technology; 2009, 1; 20-28
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

QoS Conditions for VoIP and VoD

Autorzy:

Dymarski, P.
Kula, S.
Huy, T. N.

Powiązania:

https://bibliotekanauki.pl/articles/307870.pdf

Data publikacji:

2011

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

delay jitter
packet loss rate
PESQ
POLQA
quality of service
VoD
VoIP
VQM
VQmon

Opis:

This paper concerns quality evaluation of the telecommunication services: VoIP (representing the RT interactive class) and VoD (representing the MM streaming class). Subjective and objective methods and tools for perceived quality measurement are analyzed and compared. Subjective tests are performed for selected video sequences using the Double-Stimulus Impairment Scale (DSIS) method. Thus the objective algorithms (VQM and VQmon) are calibrated. Speech quality is measured using the objective methods: PESQ and POLQA. Threshold values for network parameters (packet loss rate, delay jitter) are set, that guarantee the acceptable service quality.

Źródło:

Journal of Telecommunications and Information Technology; 2011, 3; 29-37
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Wybrane mechanizmy gwarantowania jakości usług w sieciach IP
Selected mechanisms of ensuring quality of services in IP Networks

Autorzy:

Chaładyniak, D.
Podsiadły, M.

Powiązania:

https://bibliotekanauki.pl/articles/91280.pdf

Data publikacji:

2016

Wydawca:

Warszawska Wyższa Szkoła Informatyki

Tematy:

jakość usług
opóźnienie
odrzucenie pakietów
zmienność opóźnienia
quality of services
delay
packet rejection
delay variation

Opis:

W artykule zaprezentowano wybrane mechanizmy gwarantujące jakość usług w sieciach IP (FIFO, WFQ, PQ). Na potrzeby badań stworzono odpowiednie scenariusze symulacyjne w środowisku laboratoryjnym OPNET. Przedstawiono wpływ wybranych mechanizmów gwarantowania jakości usług na tak istotne parametry infrastruktury sieciowej jak: opóźnienie, odrzucenie pakietów czy zmienność opóźnienia.
The article presents selected mechanisms of ensuring quality of services in IP networks (FIFO, WFQ, PQ). Appropriate simulation scenarios in a laboratory environment OPNET were developed. The impact of the selected mechanisms of quality of services on such important parameters of the network infrastructure as delay, packet rejection or delay variation are shown.

Źródło:

Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki; 2016, 10, 14; 49-64
1896-396X
2082-8349

Pojawia się w:

Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Phonetic Segmentation using a Wavelet-based Speech Cepstral Features and Sparse Representation Classifier

Autorzy:

Al-Hassani, Ihsan
Al-Dakkak, Oumayma
Assami, Abdlnaser

Powiązania:

https://bibliotekanauki.pl/articles/2058484.pdf

Data publikacji:

2021

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

Arabic speech corpus
ASR
F1-score
phonetic segmentation
sparse representation classifier
TTS
wavelet packet

Opis:

Speech segmentation is the process of dividing speech signal into distinct acoustic blocks that could be words, syllables or phonemes. Phonetic segmentation is about finding the exact boundaries for the different phonemes that composes a specific speech signal. This problem is crucial for many applications, i.e. automatic speech recognition (ASR). In this paper we propose a new model-based text independent phonetic segmentation method based on wavelet packet speech parametrization features and using the sparse representation classifier (SRC). Experiments were performed on two datasets, the first is an English one derived from TIMIT corpus, while the second is an Arabic one derived from the Arabic speech corpus. Results showed that the proposed wavelet packet decomposition features outperform the MFCC features in speech segmentation task, in terms of both F1-score and R-measure on both datasets. Results also indicate that the SRC gives higher hit rate than the famous k-Nearest Neighbors (k-NN) classifier on TIMIT dataset.

Źródło:

Journal of Telecommunications and Information Technology; 2021, 4; 12--22
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Automatyzacja pomiarów pakietowej stopy błędów w cyfrowym torze radiowym
Automation of packet error rate measurements in digital radio link

Autorzy:

Rzepka, D.
Krzak, Ł.
Worek, C.

Powiązania:

https://bibliotekanauki.pl/articles/152554.pdf

Data publikacji:

2010

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

pakietowa stopa błędów
PER
tor radiowy
automatyzacja pomiarów
packet error rate
radio
testbed
measurement automation

Opis:

Ocena jakości cyfrowego systemu radiokomunikacyjnego polega najczę- ściej na określeniu stopy błędów dla różnych stanów kanału transmisyjnego. W artykule przedstawiono przykładowy tor pomiarowy, umożliwiający automatyzację tego rodzaju testów. Przeanalizowano również zależność dokładności pomiaru od ilości odebranych danych oraz zbadano wpływ iteracyjnego wyznaczania ilości danych na błąd pomiaru.
Design of digital radio networks requires procedures for verification of transmission quality for every device participating in data exchange. The primary criterion of quality level is measurement of packet error rate (PER). A testbed presented in this paper enables automation of such measurements according to a programmable scenario, using control interfaces of measurement devices and processing results. The test transmitter consists of a RF signal generator modulated with the signal from an arbitrary pattern generator. A PC computer generates a test signal, controls and processes the data. The required precision of PER (Pt) measurements can be achieved by sending a certain number of test frames (n), which can be evaluated analytically [I]. The presented radio testbed was used for projects "Radio voice communication and remote control system for safety blockades and machinery, designed to work in underground coal mines" [2] and "Photovoltaics and sensors in environmental development of Malopolska region", for verification of detection and synchronization algorithms designed and implemented on FPGA devices [3]. It resulted in significant decrease of the measurements time and effort, accelerating diagnostics for radio modules.

Źródło:

Pomiary Automatyka Kontrola; 2010, R. 56, nr 8, 8; 990-993
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Analysis of the Discrete-time Multi-queue System with a Cycle-based Scheduler

Autorzy:

Burakowski, Wojciech
Sosnowski, Maciej

Powiązania:

https://bibliotekanauki.pl/articles/1839463.pdf

Data publikacji:

2021

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

discrete-time queueing system with vacations
system state distribution
packet sojourn time distribution
virtualized system

Opis:

This paper presents an analysis of a discrete-time multi-queue system handling a number of packet streams. The analysis focuses on calculating system state distribution and packet sojourn time distribution. The method relied upon for determining system state distribution is based on creating a number of equations that are solved numerically. Next, based on the distribution calculated in such a manner, we derive relations for packet sojourn time distribution. The models studied may be useful for instance in a system supporting a number of virtual links (each of a constant bitrate) that share a common physical link. Isolation of performance of those virtual links needs to be assured. Finally, we present some exemplary numerical results showing the usefulness of the proposed analysis for supporting the system dimensioning process.

Źródło:

Journal of Telecommunications and Information Technology; 2021, 2; 68-76
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Time - frequency method and artificial neural network classifier for induction motor drive system defects classification

Autorzy:

Behim, Meriem
Merabet, Leila
Saad, Salah

Powiązania:

https://bibliotekanauki.pl/articles/31341644.pdf

Data publikacji:

2024

Wydawca:

Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN

Tematy:

energy
L-kurtosis
wavelet packet decomposition
multilayer perceptron neural network
induction motor defects
vibratory signals

Opis:

In this paper, by introducing two statistical parameters, energy and L-kurtosis, a new fault diagnostic system combining Wavelet Packet Decomposition and Multilayer Perceptron Neural Network is designed to improve efficiency and precision of induction motor defects diagnosis. This method is applied to vibratory signals of asynchronous motor running at two different rotational speeds (1500 rpm and 2000 rpm) at a sampling frequency of 8 KHz to detect three main types of defects: bearing faults, load imbalance and misalignment. These speeds are considered as the usual medium running speeds of induction motor. According to the results, the high performance and accuracy of this new faults diagnostic system is proved and confirmed, thus it can be used in the detection of other machines defects.

Źródło:

Diagnostyka; 2024, 25, 1; art. no. 2024110
1641-6414
2449-5220

Pojawia się w:

Diagnostyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Machined surface quality estimation based on wavelet packets parameters of the surface image
Estymacja jakości powierzchni obrobionej na bazie parametrów rozkładu pakietów falkowych obrazu tej powierzchni

Autorzy:

Zawada-Tomkiewicz, A.

Powiązania:

https://bibliotekanauki.pl/articles/155123.pdf

Data publikacji:

2010

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

powierzchnia obrobiona
dekompozycja pakietów falkowych
obraz powierzchni
entropia
machined surface
wavelet packet decomposition
surface image
entropy

Opis:

Machined surface image, destined for monitoring, was represented by the diagnostic feature vector, correlated with maladjustment of the process. Maladjustment is manifested by the increase of the signal random component in relation to deterministic one. Such a behavior of the system was the basis for diagnostic measure elaboration. From the definition of entropy, it increases with the increase of the random component. So, the entropy of normalized energy vector for optimal decomposition tree coefficients was selected as the diagnostic measure. The correlation between the entropy of energy vector of decomposition tree coefficients and machined surface parameters and tool wear was demonstrated.
Środowisko zautomatyzowanego wytwarzania wymaga szybkich pomiarów chropowatości, jeszcze przed ostatecznym ukształtowaniem wyrobu. Do tej pory nie udało się opracować takiego układu, który spełniałby wymagania systemów sterowania produkcją, ze względu na wiele niekontrolowanych czynników wpływających na ostateczną jakość powierzchni. Jednym z możliwych do zastosowań przemysłowych układów inspekcji powierzchni jest system bazujący na obrazie tej powierzchni, szerzej omówiony w [1-4]. Obraz powierzchni po obróbce toczeniem, podobnie jak powierzchnia, jest strukturą kierunkową, w której dane zebrane w kierunku prostopadłym do śladów obróbki, w kolejnych chwilach czasu, reprezentują przebieg procesu skrawania. W artykule dane jasności obrazu powierzchni, zebrane w kierunku prostopadłym do kierunkowości, modelowano przy zastosowaniu pakietów falkowych. Problem analizy czasowo-częstotliwościowej obrazów powierzchni po toczeniu sprowadził się do przeprowadzenia odpowiedniego schematu dekompozycji przestrzeni czasowo-częstotliwościowej i wyznaczenia wektorów składowych [5-7]. Dobór drzewa dekompozycji pozwolił na ograniczenie liczby analizowanych wektorów składowych do ośmiu w2,2, w2,3, w3,3, w4,0, w4,1, w4,2, w4,3.. Zaproponowano miarę nieuporządkowania energii (entropia znormalizowanej energii) dla opisu poszczególnych składowych drzewa dekompozycji [8], które skutecznie charakteryzują nieregularność profilu obrazu powierzchni i rozregulowanie procesu. Potwierdzono zależność statystyczną między wartościami miar nieuporządkowania energii poszczególnych składowych a parametrami powierzchni i zużycia ostrza.

Źródło:

Pomiary Automatyka Kontrola; 2010, R. 56, nr 6, 6; 606-609
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Noise Detection for Biosignals Using an Orthogonal Wavelet Packet Tree Denoising Algorithm

Autorzy:

Schimmack, M.
Mercorelli, P.

Powiązania:

https://bibliotekanauki.pl/articles/226940.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

noise detection
wavelet packet transform
wavelet analysis
Daubechies wavelet
linux-based embedded system
ARM processor platform

Opis:

This article deals with the noise detection of discrete biosignals using an orthogonal wavelet packet. In specific, it compares the usefulness of Daubechies wavelets with different vanishing moments for the denoising and compression of the digitalised biosignals in case of surface electromyography (sEMG) signals. The work is based upon the discrete wavelet transform (DWT) version of wavelet package transform (WPT). A noise reducing algorithm is proposed to detect unavoidable noise in the acquired data in a model independent way. The noise of a signal sequence will be defined by a seminorm. This method was developed for a possible observation during a fracture healing period. The proposed method is general for signal processing and its design was based upon the wavelet packet.

Źródło:

International Journal of Electronics and Telecommunications; 2016, 62, 1; 15-21
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Analysis of Latency-Aware Network Slicing in 5G Packet xHaul Networks

Autorzy:

Klinkowski, Mirosław

Powiązania:

https://bibliotekanauki.pl/articles/27311921.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

5G
radio access networks
packet-switched xHaul
latency-sensitive network
network slicing
traffic prioritization
network optimization

Opis:

Packet-switched xHaul networks are a scalable solution enabling convergent transport of diverse types of radio data flows, such as fronthaul / midhaul / backhaul (FH / MH / BH) flows, between remote sites and a central site (hub) in 5G radio access networks (RANs). Such networks can be realized using the cost-efficient Ethernet technology, which enhanced with time-sensitive networking (TSN) features allows for prioritized transmission of latency-sensitive fronthaul flows. Provisioning of multiple types of 5G services of different service requirements in a shared network, commonly referred to as network slicing, requires adequate handling of transported data flows in order to satisfy particular service / slice requirements. In this work, we investigate two traffic prioritization policies, namely, flowaware (FA) and latency-aware (LA), in a packet-switched xHaul network supporting slices of different latency requirements. We evaluate the effectiveness of the policies in a networkplanning case study, where virtualized radio processing resources allocated at the processing pool (PP) facilities, for two slices related to enhanced mobile broadband (eMBB) and ultra-reliable low latency communications (URLLC) services, are subject to optimization. Using numerical experiments, we analyze PP cost savings from applying the LA policy (vs. FA) in various network scenarios. The savings in active PPs reach up to 40% − 60% in ring scenarios and 30% in a mesh network, whereas the gains in overall PP cost are up to 20% for the cost values assumed in the analysis.

Źródło:

International Journal of Electronics and Telecommunications; 2023, 69, 2; 335--340
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Impact of the duration of speech sequences on speech quality

Autorzy:

Pocta, P.
Vaculík, M.

Powiązania:

https://bibliotekanauki.pl/articles/308555.pdf

Data publikacji:

2007

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

voice transmission quality of service
speech sequence
intrusive measurement
perceptual evaluation of speech quality
jitter rate
packet loss

Opis:

This paper describes simulations of speech sequences transmission for intrusive measurement of voice transmission quality of service (VTQoS) in the environment of IP networks. The aim of the simulations was to investigate the impact of the different durations of speech sequences on speech quality from the jitter rate and packet loss point of view in IP networks. The ITU-T G.729 and ITU-T G.723.1 encoding schemes were used for the purpose of the simulations. The assessment of speech quality was realized by means of perceptual evaluation of speech quality (PESQ) algorithm. A comparison of the impact of different durations of speech sequences on speech quality and determination of the optimal duration of speech sequence for measurements of speech quality in telecommunication networks, is the aim of this paper.

Źródło:

Journal of Telecommunications and Information Technology; 2007, 4; 72-76
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Delay analysis in wireless sensor network protocols
Analiza opóźnień w protokołach bezprzewodowych sieci sensorowych

Autorzy:

Dymora, P.
Mazurek, M.

Powiązania:

https://bibliotekanauki.pl/articles/152924.pdf

Data publikacji:

2013

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

quality of service
wireless sensor networks protocols
packet delay analysis
jakość usług
protokoły bezprzewodowych sieci sensorowych
analiza opóźnień pakietów

Opis:

Sensor networks form a special group of distributed measurement systems that can be used to control a wide range of applications with strong requirements for packet delay minimization. This can be achieved by using appropriate algorithms responsible for packet routing. The study of communication delays show that architecture and protocols can be used to provide support for QoS in the sensor network applications. This problem is a major challenge for researchers. This paper presents a comparative analysis of selected routing algorithms and their impact on the packet delays in the work.
Dynamiczny rozwój miniaturyzacji oraz niskie zapotrzebowanie na energię przyczyniło się do wzrostu popularności bezprzewodowych sieci sensorowych. Sieci te tworząc specjalną grupę rozproszonych systemów pomiarowych, mogą być wykorzystane do obsługi szerokiej gamy aplikacji, mających silne wymagania co do opóźnień w przesyle informacji między węzłami, jak również strat powstałych podczas transmisji danych. Zakres wykorzystania sieci jest praktycznie nieograniczony, od systemów sieci czujników przeznaczonych m.in. do monitorowania środowiska (pożary, powodzie itp.), kontroli i monitoringu stanu zdrowia, zastosowań w automatyce domowej, systemach bezpieczeństwa czy systemach militarnych. Aby zapewnić prawidłowe działanie systemu wymagana jest duża stabilność pracy sieci, a więc niski poziom opóźnień w działaniu, uwarunkowany m.in. odpornością sieci na uszkodzenia. Sieć czujników musi reagować na zmiany w topologii sieci, wywołane przez awarię węzłów, brak zasilania czy różnego rodzaju zakłócenia elektromagnetyczne. Istotną kwestią dla zapewnienia odpowiedniego poziomu jakości transmisji jest zapewnienie maksymalnej wydajności, energooszczędności i minimalnego poziomu błędów. Można to osiągnąć poprzez zastosowanie odpowiednich algorytmów odpowiedzialnych za trasowanie pakietów. Przeprowadzone badania opóźnień komunikacyjnych pokazują, które architektury lub protokoły mogą zostać wykorzystane do zapewnienia wsparcia QoS dla obsługiwanych przez sieć sensorową aplikacji. Problem ten stanowi duże wyzwanie dla naukowców. W niniejszej pracy przedstawiono analizę porównawczą wybranych algorytmów trasowania i ich wpływ na opóźnienia w pracy.

Źródło:

Pomiary Automatyka Kontrola; 2013, R. 59, nr 10, 10; 1054-1056
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

City Backbone Network Traffic Forecasting

Autorzy:

Serikov, Tansaule
Zhetpisbayeva, Ainur
Аkhmediyarova, Аinur
Mirzakulova, Sharafat
Aigerim, Kismanova
Tolegenova, Aray
Wójcik, Waldemar

Powiązania:

https://bibliotekanauki.pl/articles/1844529.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

time series
packet intensity
Dickey-Fuller test
Kwiatkowski-Phillips-Perron-Shin-Schmitt test
forecasting
integrated moving average autoregression model

Opis:

The work considers a one-dimensional time series protocol packet intensity, measured on the city backbone network. The intensity of the series is uneven. Scattering diagrams are constructed. The Dickie Fuller test and Kwiatkowski-Phillips Perron-Shin-Schmitt test were applied to determine the initial series to the class of stationary or non-stationary series. Both tests confirmed the involvement of the original series in the class of differential stationary. Based on the Dickie Fuller test and Private autocorrelation function graphs, the Integrated Moving Average Autoregression Model model is created. The results of forecasting network traffic showed the adequacy of the selected model.

Źródło:

International Journal of Electronics and Telecommunications; 2021, 67, 3; 319-324
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Wykorzystanie analizy WPT i sieci neuronowych PNN w diagnozowaniu zakłóceń w dopływie paliwa do cylindrów
The application of a wavelet packet transform and PNN neural network for disturbances in the fuel inflow SI engine detection

Autorzy:

Czech, P.
Madej, H.

Powiązania:

https://bibliotekanauki.pl/articles/256599.pdf

Data publikacji:

2009

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy

Tematy:

diagnostyka
silnik spalinowy
analiza falkowa (WPT)
sieć neuronowa PNN
diagnostics
SI engine
wavelet packet transform
WPT
PNN neural network

Opis:

W artykule przedstawiono wyniki badań diagnostycznych silnika spalinowego przy zastosowaniu pakietu analizy falkowej (WPT) i probabilistycznej sieci neuronowej. Obiektem badań był czterocylindrowy silnik spalinowy z zapłonem iskrowym. Głównym celem badań było określenie wpływu symulowanego braku dopływu paliwa do poszczególnych cylindrów na sygnał przyspieszeń drgań kadłuba silnika. Zarejestrowane sygnały przyspieszeń drgań zostały poddane analizie za pomocą WPT w celu określenia entropii sygnału na poszczególnych poziomach dekompozycji. Określona wartość entropii stanowiła podstawę do budowy wzorców stanów pracy silnika przeznaczonych do uczenia sieci neuronowych. Z przeprowadzonych badań wynika, że istnieje możliwość wykorzystania analizy WPT i probabilistycznych sztucznych sieci neuronowych do diagnozowania uszkodzeń silników spalinowych.
An investigation of a fault diagnostic technique for internal combustion engine using wavelet packet transform (WPT) and probabilistic neural network is presented in this paper. The object of research was a four-cylinder spark ignition engine. The main purpose of the research was to determine the effect of the lack of fuel inflow to an individual cylinder of the engine block vibration signal. The vibration signals are decomposed by WPT to obtain the approximated and detailed coefficient and to calculate wavelet packet node entropy. The value of entropy was used as a basis in the construction of the states of engine operation intended for teaching probabilistic neural network. The experimental results indicated that the proposed system using the engine block vibration signal is effective and can be used for fault detection of an IC engine.

Źródło:

Problemy Eksploatacji; 2009, 1; 17-26
1232-9312

Pojawia się w:

Problemy Eksploatacji

Dostawca treści:

Biblioteka Nauki

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Tytuł:

Performance evaluation of an M/G/n-type queue with bounded capacity and packet dropping

Autorzy:

Tikhonenko, O.
Kempa, W. M.

Powiązania:

https://bibliotekanauki.pl/articles/331288.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

AQM algorithm
finite buffer
loss probability
total packet volume
queue size distribution
aktywne zarządzanie kolejką
prawdopodobieństwo straty
rozkład wielkości kolejki

Opis:

A queueing system of the M/G/n-type, n ≥ 1, with a bounded total volume is considered. It is assumed that the volumes of the arriving packets are generally distributed random variables. Moreover, the AQM-type mechanism is used to control the actual buffer state: each of the arriving packets is dropped with a probability depending on its volume and the occupied volume of the system at the pre-arrival epoch. The explicit formulae for the stationary queue-size distribution and the loss probability are found. Numerical examples illustrating theoretical formulae are given as well.

Źródło:

International Journal of Applied Mathematics and Computer Science; 2016, 26, 4; 841-854
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

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