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Tytuł:
Effective throughput of AX.25 protocol
Autorzy:
Zieliński, B.
Powiązania:
https://bibliotekanauki.pl/articles/200383.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wireless LANs
AX.25 protocol
TNC controller
effective throughput
throughput upper limit
Opis:
AX.25 protocol belongs to the HDLC protocols family and is used, among others, as a data link layer in an amateur Packet Radio network. The paper presents a simple analytical model developed on the basis of protocol frame exchange rules. Then, we compare analytical results to the experimental ones achieved using various different types of TNC controllers that act as network interfaces for Packet Radio network. In the experimental part we focus on both hardware and software properties of TNC that have influence on the effective throughput of the network.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 639-647
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Throughput comparison between the new HEW 802.11ax standard and 802.11n/ac standards in selected distance windows
Autorzy:
Masiukiewicz, Antoni
Powiązania:
https://bibliotekanauki.pl/articles/226879.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wireless networks
throughput optimization
WLANS
Opis:
The 802.11ax standard final specification is expected in 2019, however first parameters are just released. The target of the new standard is four times improvement of the average throughput within the given area. This standard is dedicated for usage in dense environment such as stadiums, means of municipal communication, conference halls and others. The main target is to support many users at the same time with the single access point. The question arises if the new standard will have higher throughput then previous ones in the single user mode. The author calculated the maximal theoretical throughput of the 802.11ax standard and compared the results with the throughput of older 802.11 standards such as 802.11n and 802.11ac. The new he-wifi-network example included in the ns-3.27 release of the NS-3 simulator was used to simulate the throughput between the access point and the user terminal. The results indicate that in some conditions the 802.11ac standard has higher throughput than the new 802.11ax standard.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 1; 79-84
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Operational characteristic of wireless WiMax and IEEE 802.11x systems in underground mine environments
Autorzy:
Kowal, M.
Kubal, S.
Piotrowski, P.
Zieliński, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/227021.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
WLAN
WiMAX
throughput
delay
mine environment
Opis:
The paper presents research results pertaining to transmission parameters of wireless communication systems, based on WiMax and IEEE 802.11x radio interfaces. Research was performed in severe operating conditions of an underground mine - testing various parameters, such as: throughput, delays and maximum range.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 1; 81-86
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study of two selected eastern port operational performance in Nigeria: Case of Rivers and Delta ports
Autorzy:
Nwaogbe, Obioma Reuben
Erhijivwo, Sophia
Miracle, John
Powiązania:
https://bibliotekanauki.pl/articles/27324308.pdf
Data publikacji:
2023
Wydawca:
Fundacja Centrum Badań Socjologicznych
Tematy:
ports performance
turnaround
port
cargo throughput
Opis:
Purpose: The main purpose of this paper is to compare the operational performance of two selected eastern ports in Nigeria: Rivers and Delta ports. Methodology: The paper uses secondary data from the Nigeria Port Authority (NPA) Portal from 2008 to 2013. The paper employs multiple regression models to analyze the data using SPSS and Statgraphics software packages. Results: The results show that Rivers port has a higher operational efficiency than Delta port, with an R-squared value of 81.34% and 79.47%, respectively. The results also reveal a significant relationship between cargo throughput and some independent variables, such as vessel traffic, turnaround time, berth occupancy, and number of employees. Theoretical contribution: The paper contributes to the existing literature on port performance measurement and improvement by applying multiple regression models to assess the operational efficiency of two Nigerian ports. The paper also provides empirical evidence on the factors affecting port performance in a developing country context. Practical implications: The paper has practical implications for port authorities, maritime agencies, shipping companies, and the government. The paper suggests some policy recommendations to enhance the operational performance of the eastern ports, such as improving port infrastructure, pricing policy, and strategic competition.
Źródło:
Journal of Sustainable Development of Transport and Logistics; 2023, 8, 2; 153--163
2520-2979
Pojawia się w:
Journal of Sustainable Development of Transport and Logistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of iPerf as a Tool for LAN Throughput Prediction
Autorzy:
Zieliński, Bartłomiej
Powiązania:
https://bibliotekanauki.pl/articles/27311890.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
local area networks
throughput
FTP
iPerf
Opis:
This article discusses whether iPerf can be used as an effective tool for wired and wireless LAN throughput estimation. The potential advantages of using iPerf in comparison to FTP are discussed. Finally, the article presents the throughput measurement results obtained with FTP, iPerf2 and iPerf3 in a simple experimental network.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 3; 523--528
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
QoS-based Joint User Selection and Scheduling for MU-MIMO WLANs
Autorzy:
Rao, D. S.
Hency, V. D. B.
Powiązania:
https://bibliotekanauki.pl/articles/309403.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
802.11ac
CSI
delay
MMSE
throughput
Opis:
The shift in Multi-User Multiple Input Multiple Output (MU-MIMO) has gained attention due to its wide support in very high throughput Wireless Local Area Networks (WLANs) such as the 802.11ac. However, the full advantage of MU-MIMO can be utilized only with proper user selection and scheduling. Also, providing Quality of Service (QoS) support is a major challenge for these wireless networks. Generally, user scheduling is done with the acquisition of Channel State Information (CSI) from all the users. In MU-MIMO based WLANs, the number of CSI request increases with the number of users. This results in an increased CSI overhead and in degradation of the overall throughput. Most of the proposals in the literature have not addressed the contention in the CSI feedback clearly. Hence, in this paper a Joint User Selection and Scheduling (JUSS) scheme is discussed and its performance is evaluated in terms of throughput, delay, packet loss and fairness. In the performance comparison some wellknown Medium Access Control (MAC) protocols are considered. The proposed scheme not only enhances throughput, but also avoids contention during CSI feedback period.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 4; 17-24
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving manufacturing processes using simulation methods
Autorzy:
Kłos, S.
Patalas-Maliszewska, J.
Trebuna, P.
Powiązania:
https://bibliotekanauki.pl/articles/118119.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
computer simulation
production line
buffer allocation
throughput
Opis:
The paper presents the results of simulation research on buffer space allo-cated in a flow line and operation times influence on the throughput of a manufacturing system. The production line in the study consists of four stages and is based on a real machining manufacturing system of a small production enterprise. Using Tecnomatix Plant Simulation software, a simulation model of the system was created and set of experiments was planned. Simulation experiments were prepared for different capacities of intermediate buffers located between manufacturing resources and op-eration times as input parameters, and the throughput per hour and aver-age life span of products as the output.
Źródło:
Applied Computer Science; 2016, 12, 4; 7-17
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the search of efficient AQM for large delay networks
Algorytm AQM dla sieci z dużymi opóźnieniami
Autorzy:
Brachman, A.
Chrost, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/375627.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
active queue management
large delay network
throughput
Opis:
The main idea of all Active Queue Management algorithms, is to notify the TCP sender about incoming congestion by dropping packets, to prevent from the buffer overflow, and its negative consequences. However, most AQM algorithms proposed so far, neglect the impact of the high speed and long delay links. As a result, the algorithms' efficiency, in terms of throughput and/or queue stability, is usually significantly decreased. The contribution of this paper is twofold. First of all, the performance of the well known AQM algorithms in high speed and long delay scenarios is evaluated and compared. Secondly, a new AQM algorithm is proposed, to improve the throughput in the large delay scenarios and to exclude the usage of random number generator.
W obecnym Internecie odrzucanie bądź znakowanie pakietów ma na celu powiadomienie nadawcy o przeciążeniu. Ten fakt jest wykorzystywany przez źródła TCP w celu ograniczenia prędkości nadawania. Rozwiązaniem problemu pełnej kolejki jest prewencyjne odrzucanie pakietów, aby nie dopuścić do zapełnienia bufora i powstania przeciążenia. Prawdopodobieństwo prewencyjnego odrzucenia pakietu rośnie wraz ze wzrostem poziomu przeciążenia. Idea ta jest wykorzystywana w aktywnych algorytmach zarządzania kolejką. Prewencyjne odrzucanie pakietów wprowadza mechanizm sprzężenia zwrotnego informując nadawców o zbliżającym się przeciążeniu. Informacja jest wykorzystywana przez nadawców w celu zwolnienia szybkości nadawania. Losowe odrzucanie wybranych pakietów pozwala uniknąć sytuacji, w której wszystkie źródła zwalniają jednocześnie, co eliminuje problem globalnej synchronizacji. Większość obecnych algorytmów AQM pomija wpływ cech charakterystycznych dla łączy szkieletowych, tj. dużej przepustowości i dużych opóźnień propagacji. W rezultacie sprawność algorytmów AQM rozumiana jako przepustowość łącz i stabilność kolejki jest znacznie mniejsza niż w sieciach dostępowych. W pracy zaprezentowano badania wydajności popularnych algorytmów AQM w sieciach szkieletowych o dużych przepustowościach i dużych opóźnieniach propagacji. Wdalszej części przedstawiono propozycje algorytmu, który ma na celu poprawić przepustowość transmisji na tych łączach i który pozwala wykluczyć użycie generatora liczb losowych. Zaproponowana metoda - algorytm LINDROP - wykorzystuje niemalejącą funkcję liniową, w zależności od średniej długości kolejki, do oszacowania współczynnika odrzucania nadchodzących pakietów. Algorytm poprawia przepustowość w łączu szkieletowym.
Źródło:
Theoretical and Applied Informatics; 2011, 23, 1; 3-20
1896-5334
Pojawia się w:
Theoretical and Applied Informatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production Economics with the Use of Theory of Constraints
Autorzy:
Wojakowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/409558.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
theory of constraints
TOC
throughput accounting
TA
Opis:
The article is a literature review in the scope of theory of constraints in manufacturing companies developed by E. Goldratt. Particular emphasis is placed on the economic sphere of such companies as opposed to the literature dedicated to solving production control problem by using DBR technique advocated by developers and active users of theory of constraints. The article aims to show the approach to the presentation of measurements developed by theory of constraints in the context of corporate net profit and return on invested money in productive activities in the real industrial plants. This is called throughput accounting that indicates the effectiveness of money processing in the production system. In addition, literature analysis aims to show the degree of utilization of theory of constraints in scientific environments in the context of efficiency measures in achieving the goal objective of making money or achieving degree of operational expenses savings in production systems.
Źródło:
Research in Logistics & Production; 2016, 6, 1; 79-88
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bacterial communities in PM2.5 and PM10 in broiler houses at different broiler growth stages in spring
Autorzy:
Zhang, J.
Li, Y.
Xu, E.
Jiang, L.
Tang, J.
Li, M.
Zhao, X.
Chen, G.
Zhu, H.
Yu, X.
Zhang, X.
Powiązania:
https://bibliotekanauki.pl/articles/2087465.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bacterial communities
broilers
high-throughput sequencing
particulate matter
Źródło:
Polish Journal of Veterinary Sciences; 2019, 3; 495-504
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fairness considerations with algorithms for elastic traffic routing
Autorzy:
Cinkler, T.
Laborczi, P.
Pióro, M.
Powiązania:
https://bibliotekanauki.pl/articles/308189.pdf
Data publikacji:
2004
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
elastic traffic
routing
fairness
maximum throughput
algorithms
ILP
heuristics
Opis:
The bit rate of modern applications typically varies in time. We consider the traffic elastic if the rate of the sources can be controlled as a function of free resources along the route of that traffic. The objective is to route the demands optimally in sense of increasing the total network throughput while setting the rates of sources in a fair way. We propose a new fairness definition the relative fairness that handles lower and upper bounds on the traffic rate of each source and we compare it with two other known fairness definitions, namely, the max-min and the proportional rate fairness. We propose and compare different routing algorithms, all with three types of fairness definitions. The algorithms are all a tradeoff between network throughput, fairness and computational time.
Źródło:
Journal of Telecommunications and Information Technology; 2004, 2; 3-12
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Spectrum Sensing Parameters in Cognitive Radio Using Adaptive Genetic Algorithm
Autorzy:
Chatterjee, S.
Dutta, S.
Bhattacharya, P. P.
Roy, J. S.
Powiązania:
https://bibliotekanauki.pl/articles/308511.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
adaptive genetic algorithm
bandwidth
cognitive radio
spectrum sensing
throughput
Opis:
Quality of service parameters of cognitive radio, like, bandwidth, throughput and spectral efficiency are optimized using adaptive and demand based genetic algorithm. Simulation results show that the proposed method gives better real life solution to the cognitive radio network than other known approach.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 1; 21-27
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dining Cryptographers with 0.924 Verifiable Collision Resolution
Autorzy:
Franck, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/106326.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
dining cryptographers protocol
algorithms
stable throughput
collision resolution
anonymity
Opis:
The dining cryptographers protocol implements a multiple access channel in which senders and recipients are anonymous. A problem is that a malicious participant can disrupt communication by deliberately creating collisions. We propose a computationally secure dining cryptographers protocol with collision resolution that achieves a maximum stable throughput of 0.924 messages per round and which allows to easily detect disruptors.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2014, 14, 1; 49-60
1732-1360
2083-3628
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sequentially Distributed Coalition Formation Game for Throughput Maximization in C-RANs
Autorzy:
Gbenga-Ilori, A.
Sanusi, O.
Powiązania:
https://bibliotekanauki.pl/articles/226910.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coalition game
C-RAN
SDCF
throughput
interference
wireless networks
Opis:
Cloud radio access network (C-RAN) has been proposed as a solution to reducing the huge cost of network upgrade while providing the spectral and energy efficiency needed for the new generation cellular networks. In order to reduce the interference that occur in C-RAN and maximize throughput, this paper proposes a sequentially distributed coalition formation (SDCF) game in which players, in this case the remote radio heads (RRHs), can sequentially join multiple coalitions to maximize their throughput. Contrary to overlapping coalition formation (OCF) game where players contribute fractions of their limited resources to different coalitions, the SDCF game offers better stability by allowing sequential coalition formation depending on the availability of resources and therefore providing a balance between efficient spectrum use and interference management. An algorithm for the proposed model is developed based on the merge-only method. The performance of the proposed algorithm in terms of stability, complexity and convergence to final coalition structure is also investigated. Simulation results show that the proposed SDCF game did not only maximize the throughput in the C-RAN, but it also shows better performances and larger capabilities to manage interference with increasing number of RRHs compared to existing methods.
Źródło:
International Journal of Electronics and Telecommunications; 2018, 64, 4; 505-512
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 65

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