scholarly journals Analysis and Performance Evaluation of the IEEE 802.16 ARQ Mechanism

2008 ◽  
Vol 4 (1) ◽  
pp. 29 ◽  
Author(s):  
Vitaliy Tykhomyrov ◽  
Alexander Sayenko ◽  
Henrik Martikainen ◽  
Olli Alanen
Keyword(s):  
Data Transmission ◽  
Block Size ◽  
Ieee 802.16 ◽  
Reliable Data ◽  
Mac Layer ◽  
Feedback Type ◽  
Transmission Window ◽  
Key Features ◽  
And Performance ◽  
Application Protocols

The IEEE 802.16 standard defines the ARQ mechanismas a part of the MAC layer. The functioning of the ARQmechanism depends on a number of parameters. The IEEE802.16 specification defines them but it does not provide concrete values and solutions. This paper studies the key features and parameters of the 802.16 ARQ mechanism. In particular, we consider a choice for the ARQ feedback type, an algorithm to build block sequences, the ARQ feedback intensity, a scheduling of the ARQ feedbacks and retransmissions, the ARQ block rearrangement, ARQ transmission window and the ARQ block size. We ran simulation scenarios to study these parameters and how they impact the performance of application protocols. Thesimulation results reveal that the ARQ mechanism and its correct configuration play an important role in achieving reliable data transmission.

Indigenous Novels in Canada

2018 ◽  
Author(s):  
Tara Hyland-Russell
Keyword(s):  
Coming Of Age ◽  
Institutional Racism ◽  
Indigenous Literature ◽  
Poetic Tradition ◽  
Performance Traditions ◽  
Growing Body ◽  
Key Features ◽  
Power Of Story ◽  
And Performance ◽  
Place And Identity

Canadian Indigenous novels emerged as a specific genre within the last thirty years, rooted in a deep, thousands-year-old ‘performance art and poetic tradition’ of oratory, oral story, poetry, and drama. In addition to these oral and performance traditions are the ‘unique and varying methods of written communication’ that flourished long before contact with Europeans. The chapter considers Canadian novels by Indigenous writers. It shows that Indigenous fiction is deeply intertwined with history, politics, and a belief in the power of story to name, resist, and heal; that novel-length Aboriginal fiction in Canada built on a growing body of other forms of Indigenous literature; and that many Indigenous novels foreground their relationship with place and identity as key features of the resistance against systemic and institutional racism. It also examines coming-of-age novels of the 1980s and 1990s that are grounded in realism.

scholarly journals Recent Advances in Conventional Methods and Electrochemical Aptasensors for Mycotoxin Detection

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1437
Author(s):  
Jing Yi Ong ◽  
Andrew Pike ◽  
Ling Ling Tan
Keyword(s):  
Quantitative Analysis ◽  
Animal Feed ◽  
Cost Effective ◽  
Preventive Action ◽  
High Affinity ◽  
Recent Advances ◽  
Recognition Elements ◽  
Key Features ◽  
Pre Treatment ◽  
And Performance

The presence of mycotoxins in foodstuffs and feedstuffs is a serious concern for human health. The detection of mycotoxins is therefore necessary as a preventive action to avoid the harmful contamination of foodstuffs and animal feed. In comparison with the considerable expense of treating contaminated foodstuffs, early detection is a cost-effective way to ensure food safety. The high affinity of bio-recognition molecules to mycotoxins has led to the development of affinity columns for sample pre-treatment and the development of biosensors for the quantitative analysis of mycotoxins. Aptamers are a very attractive class of biological receptors that are currently in great demand for the development of new biosensors. In this review, the improvement in the materials and methodology, and the working principles and performance of both conventional and recently developed methods are discussed. The key features and applications of the fundamental recognition elements, such as antibodies and aptamers are addressed. Recent advances in aptasensors that are based on different electrochemical (EC) transducers are reviewed in detail, especially from the perspective of the diagnostic mechanism; in addition, a brief introduction of some commercially available mycotoxin detection kits is provided.

scholarly journals A Simulation Model of IEEE 802.15.4 GTS Mechanism and GTS Attacks in OMNeT++ / MiXiM + NETA

2018 ◽  
Vol 11 (1) ◽  
pp. 78 ◽  
Author(s):  
Yasmin M. Amin ◽  
Amr T. Abdel-Hamid
Keyword(s):  
Simulation Model ◽  
Data Transmission ◽  
Ieee 802.15.4 ◽  
Personal Area Networks ◽  
Wireless Personal Area Networks ◽  
Mac Layer ◽  
Management Scheme ◽  
Free Data ◽  
Ieee 802.15.4 Standard ◽  
Time Critical

The IEEE 802.15.4 standard defines the PHY and MAC layer specifications for Low-Rate Wireless Personal Area Networks (LR-WPANs). With the proliferation of many time-critical applications with real-time delivery, low latency, and/or specific bandwidth requirements, Guaranteed Time Slots (GTS) are increasingly being used for reliable contention-free data transmission by nodes within beacon-enabled WPANs. To evaluate the performance of the 802.15.4 GTS management scheme, this paper introduces a new GTS simulation model for OMNeT++ / MiXiM. Our GTS model considers star-topology WPANs within the 2.4 GHz frequency band, and is in full conformance with the IEEE 802.15.4 – 2006 standard. To enable thorough investigation of the behaviors and impacts of different attacks against the 802.15.4 GTS mechanism, a new GTS attacks simulation model for OMNeT++ is also introduced in this paper. Our GTS attacks model is developed for OMNeT++ / NETA, and is integrated with our GTS model to provide a single inclusive OMNeT++ simulation model for both the GTS mechanism and all known-to-date attacks against it.

The Design and Implementation of ECC High-Speed Encryption Engine Based on FPGA

2012 ◽  
Vol 459 ◽  
pp. 544-548 ◽  
Author(s):  
Wei Liang ◽  
Jian Bo Xu ◽  
Wei Hong Huang ◽  
Li Peng
Keyword(s):  
Data Transmission ◽  
High Speed ◽  
Lower Cost ◽  
Low Cost ◽  
Rapid Development ◽  
Security Technology ◽  
Multiplication Algorithm ◽  
Secure Data Transmission ◽  
And Performance ◽  
Computation Speed

Network security technology ensures secure data transmission in network. Meanwhile, it brings extra overhead of security system in terms of cost and performance, which seriously affects the rapid development of existing high-speed encryption systems. The existing encryption technology cannot meet the demand of high security, low cost and high real-time. For solving above problems, an ECC encryption engine architecture based on scalable public key cipher and a high-speed configurable multiplication algorithm are designed. The algorithm was tested on FPGA platform and the experiment results show that the system has better computation speed and lower cost overhead. By comparing with other systems, our system has benefits in terms of hardware overhead and encryption time ratio

Real Time Data: Interactive Monitoring of Data Flow for Continuous and Reliable Data Transmission

2013 ◽  
Author(s):  
Abdulrahman A. Al-Amer ◽  
Muhammad Al-Gosayir ◽  
Naser Al-Naser ◽  
Hussain Al-Towaileb
Keyword(s):  
Real Time ◽  
Data Transmission ◽  
Data Flow ◽  
Reliable Data ◽  
Time Data ◽  
Real Time Data
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