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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:
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:
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:
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
Tytuł:
Composition of norfloxacin-resistant bacteria and isolation of norfloxacin-degrading bacteria in subtropical aquaculture ponds in China
Autorzy:
Mao, Lutian
Chen, Lifen
Wang, Xirui
Xu, Zhongbao
Ouyang, Hui
Huang, Biyou
Zhou, Libin
Powiązania:
https://bibliotekanauki.pl/articles/4790189.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-throughput sequencing
norfloxacin
antibiotic resistant bacterium
pond culture
Opis:
To analyze the composition of norfloxacin-resistant bacteria and norfloxacin-degrading bacteria in pond water and sediment in subtropical China, the composition of antibiotic resistant bacteria in pond water and sediment enriched with norfloxacin-containing medium was analyzed by high-throughput sequencing. Sediment and water samples were collected from 3 fish ponds in subtropical China, and domesticated with norfloxacin, subsequently norfloxacin-resistant bacteria through high-throughput sequencing of 16S rDNA, and isolated norfloxacin--degrading bacteria. Our results showed that the pond sediment and water contain a variety of norfloxacin-resistant bacteria, mainly from Proteobacteria, Bacteroidetes, Actinobacteria, Firmicutes, and Chloroflexi. Moreover, we isolated two norfloxacin-degrading bacteria (NorXu-2 and NorXu-3). The norfloxacin-degrading rate by NorXu-2 and NorXu-3 in the culture mediums with 200 μg/mL was the highest, which was up to 49.71% and 35.79%, respectively. When the norfloxacin concentration was 200 μg/mL, NorXu-2 and NorXu-3 had the best norfloxacin- -degrading effect at pH of 6, and the degradation rates were 53.64% and 45.54%, respectively. Moreover, NorXu-3 exhibited a good tolerance to high NaCl concentration. These results not only provided basic data for the follow-up study of the molecular mechanism of antimicrobial microbial degradation, but also provided potential norfloxacin degrading bacteria for norfloxacin removal and bioremediation in aquaculture environment.
Źródło:
Archives of Environmental Protection; 2022, 48, 4; 95--101
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Throughput, Spectral, and Energy Efficiency of 5G Massive MIMO Applications Using Different Linear Precoding Schemes
Autorzy:
Salah, Ibrahim
Rahouma, Kamel Hussein
Hussein, Aziza I.
Mabrook, M. Mourad
Powiązania:
https://bibliotekanauki.pl/articles/2203002.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
throughput
massive MIMO
spectral efficiency
energy efficiency
trade-off
Opis:
On fifth-generation wireless networks, a potential massive MIMO system is used to meet the ever-increasing request for high-traffic data rates, high-resolution streaming media, and cognitive communication. In order to boost the trade-off between energy efficiency (EE), spectral efficiency (SE), and throughput in wireless 5G networks, massive MIMO systems are essential. This paper proposes a strategy for EE 5G optimization utilizing massive MIMO technology. The massive MIMO system architecture would enhance the trade-off between throughput and EE at the optimum number of working antennas. Moreover, the EE-SE tradeoff is adjusted for downlink and uplink massive MIMO systems employing linear precoding techniques such as Multiple -Minimum Mean Square Error (M-MMSE), Regularized Zero Forcing (RZF), Zero Forcing (ZF), and Maximum Ratio (MR). Throughput is increased by adding more antennas at the optimum EE, according to the analysis of simulation findings. Next, utilizing M MMSE instead of RZF and ZF, the suggested trading strategy is enhanced and optimized. The results indicate that M-MMSE provides the best tradeoff between EE and throughput at the determined optimal ratio between active antennas and active users equipment’s (UE).
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 1; 185--191
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency analysis of IEEE 802.11 protocol with block acknowledge and frame aggregation
Autorzy:
Zieliński, B.
Powiązania:
https://bibliotekanauki.pl/articles/202267.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wireless LANs
IEEE 802.11
protocol performance
throughput upper limit
Opis:
The article presents data transmission methods in IEEE 802.11 wireless LAN standard, including transmission efficiency improving methods like block acknowledge and two variants of frame aggregation. On the basis of their operation, an analytical model is derived which allows for estimation of protocol efficiency and effective throughput under perfect conditions for various protocol parameters. With this model, all transmission methods are analysed for their efficiency for two currently used physical layers, namely, OFDM (802.11a/g) and HT (802.11n). The calculation results are presented on graphs and discussed. Finally, so-called throughput upper limit is calculated for all the methods considered in the paper.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 2; 235-243
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of the availability of resources, the allocation of buffers and number of workers on the effectiveness of an assembly manufacturing system
Autorzy:
Kłos, S.
Trebuna, P.
Powiązania:
https://bibliotekanauki.pl/articles/407452.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computer simulation
availability of resources
buffer allocation
throughput analysis
work-in-progress
Opis:
This paper proposes the application of computer simulation methods in order to analyse the availability of resources, buffers and the impact of the allocation of workers on the throughput and work-in-progress of a manufacturing system. The simulation model of the production system is based on an existing example of a manufacturing company in the automotive industry. The manufacturing system includes both machining and assembly operations. Simulation experiments were conducted vis-`a-vis the availability of the different manufacturing resources, the various allocations of buffer capacities and the number of employees. The production system consists of three manufacturing cells – each cell including two CNC machines – and two assembly stations. The parts produced by the manufacturing cells are stored in buffers and transferred to the assembly stations. Workers are allocated to the manufacturing cells and assembly stations, but the number of workers may be less than number of workplaces and are thus termed ‘multi-workstations’. Using computer simulation methods, the impact of the availability of resources, the number of employees and of the allocation of buffer capacity on the throughput and work-in-progress of the manufacturing system is analysed. The results of the research are used to improve the effectiveness of manufacturing systems using a decision support system and the proper control of resources. Literature analysis shows that the study of the impact of buffer capacities, availability of resources and the number of employees on assembly manufacturing system performance have not been carried out so far.
Źródło:
Management and Production Engineering Review; 2017, 8, 3; 40-49
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Next Generation Dynamic Inter-Cellular Scheduler
Autorzy:
Yağcıoğlu, Mert
Bayat, Oğuz
Powiązania:
https://bibliotekanauki.pl/articles/963803.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
frequency reuse
Inter-Cell Interference Coordination
LTE
OFDMA
throughput
SINR
capacity
scheduling
load balancing
Opis:
Orthogonal frequency division multiple access (OFDMA) in Long Term Evolution (LTE) can effectively eliminate intra-cell interferences between the subcarriers in a single serving cell. But, there is more critical issue that, OFDMA cannot accomplish to decrease the inter-cell interference. In our proposed method, we aimed to increase signal to interference plus noise ratio (SINR) by dividing the cells as cell center and cell edge. While decreasing the interference between cells, we also aimed to increase overall system throughput. For this reason, we proposed a dynamic resource allocation technique that is called Experience-Based Dynamic Soft Frequency Reuse (EBDSFR). We compared our proposed scheme with different resource allocation schemes that are Dynamic Inter-cellular Bandwidth Fair Sharing FFR (FFRDIBFS) and Dynamic Inter-cellular Bandwidth Fair Sharing Reuse-3 (Reuse3DIBFS). Simulation results indicate that, proposed EBDSFR benefits from overall cell throughput and obtains higher user fairness than the reference schemes.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 3; 441-448
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soil microbiomes of reclaimed and abandoned mines of the Yamal region
Autorzy:
Pershina, Elizaveta
Ivanova, Ekaterina
Kimeklis, Anastasia
Zverev, Alexey
Kichko, Arina
Aksenova, Tatiana
Andronov, Evgeny
Abakumov, Evgeny
Powiązania:
https://bibliotekanauki.pl/articles/2041836.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Yamal Peninsula
microbiome
soil
high-throughput sequencing
16S rRNA
qPCR
mining
reclamation
Źródło:
Polish Polar Research; 2020, 41, 1; 95-114
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using computer simulation method to improve throughput of production systems by buffers and workers allocation
Autorzy:
Kłos, S.
Trebuna, P.
Powiązania:
https://bibliotekanauki.pl/articles/406730.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computer simulation
series-parallel production line
buffer allocation
throughput analysis
life span of products
Opis:
This paper proposes the application of computer simulation methods to support decision making regarding intermediate buffer allocations in a series-parallel production line. The simulation model of the production system is based on a real example of a manufacturing company working in the automotive industry. Simulation experiments were conducted for different allocations of buffer capacities and different numbers of employees. The production system consists of three technological operations with intermediate buffers between each operation. The technological operations are carried out using machines and every machine can be operated by one worker. Multi-work in the production system is available (one operator operates several machines). On the basis of the simulation experiments, the relationship between system throughput, buffer allocation and the number of employees is analyzed. Increasing the buffer capacity results in an increase in the average product lifespan. Therefore, in the article a new index is proposed that includes the throughput of the manufacturing system and product life span. Simulation experiments were performed for different configurations of technological operations.
Źródło:
Management and Production Engineering Review; 2015, 6, 4; 60-69
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-throughput phenotyping and genotyping in comparative QTL analysis of early short-time drought tolerance in Polish fodder and malting spring barleys
Autorzy:
Wojcik-Jagla, M.
Rapacz, M.
Tyrka, M.
Koscielniak, J.
Crissy, K.
Zmuda, K.
Powiązania:
https://bibliotekanauki.pl/articles/80659.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
spring barley
malting barley
high throughput
phenotyping
genotyping
quantitative trait locus
drought tolerance
fodder barley
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
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