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Efficient processing power reservation approach to imporove real-time task schedulability and relaibaility

International Journal of computer science Issues 2012年第5 5-2期9卷 196-205页

作者： Youssef, Ahmed E. Hamdy, Abeer Ammar, Reda Faculty of Engineering-Helwan Helwan University Cairo Egypt Department of Information Systems King Saud University Riyadh 11543 Saudi Arabia Department of Computers and Systems Electronic Research Institute Faculty of informatics and Computer Science British University Egypt Dep. of Computer Science and Engineering University of Connecticut Storrs CT 06269-3155 United States

Efficient utilization of the computational resources is an urgent demand especially if real time constraints should be guaranteed. Moreover, an acceptable level of reliability should be provided due to the critical nature of some real time applications. This paper proposes a new approach for processing power reservations that efficiently utilizes all the available processing power to improve reliability and schedulability of independent real time tasks on a uniprocessor. The basic idea of the proposed approach is to use all of the available processing power in the time interval between the arrivals of two successive tasks or when an existing task departs. The advantages of this mechanism are: 1) it reduces the execution time required for each task and hence increases its reliability. 2) At the arrival of a new task;the processing power requirements for the executing tasks to meet their deadlines are smaller, which gives the new arriving tasks higher chances to be accommodated with the existing ones. 3) Efficient processing power utilization may reduce the power consumption in processors with dynamic voltage scaling. An illustration example and simulation experiments showed that our approach provides a more reliable scheduling scheme with higher acceptance rate compared to the traditional approach based on Rialto operating system. © 2012 International Journal of computer science Issues.

关键词： Reliability

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Digital art: Evaluation, appreciation, critique (invited SIG)

Digital art: Evaluation, appreciation, critique (invited SIG...

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30th ACM Conference on Human Factors in Computing systems, CHI 2012

作者： England, David Fantauzzacoffin, Jill Bryan-Kinns, Nick Latulipe, Celine Candy, Linda Sheridan, Jennifer School of Computing and Maths Liverpool John Moores University Liverpool United Kingdom Department of Digital Media Georgia Institute of Technology Atlanta GA United States School of Electronic Engineering and Computer Science Queen Mary University of London London. E1 4N United Kingdom Department of Software and Information Systems University of North Carolina at Charlotte Charlotte NC United States Creativity and Cognition Studios University of Technology Sydney NSW Australia BigDog Interactive Ltd. London United Kingdom

ISBN: (纸本)9781450310161

This SIG examines the vexed question of evaluation of Digital Art and how lessons on evaluation can be exchanged between the arts and mainstream HCI. We start by looking at critiques of standard approaches to evaluation in HCI. We then look at approaches, which have been developed in Digital Art to merge qualitative and quantitative methods. These investigations set the agenda for the SIG with the aim of uncovering the audience's knowledge and attempts at Digital Art evaluation, appreciation and critique. The chief outcome will be an exchange of experiences and proposals for ways forward for both the Digital Arts community and the broader CHI community. © 2012 Authors.

关键词： Arts computing

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A memoryless Viterbi decoder for LTE systems

A memoryless Viterbi decoder for LTE systems

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IEEE Global Conference on Consumer Electronics (GCCE)

作者： Chu Yu Yu-Shan Su Bor-Shing Lin Po-Hsun Cheng Sao-Jie Chen Department of Electronic Engineering National Ilan University Yilan Taiwan Department of Software Engineering National Kaohsiung Normal University Kaohsiung Taiwan Department of Computer Science and Information National Taiwan University Taipei Taiwan Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan

This paper presents a novel memoryless Viterbi decoder (VD) with a 4-level soft decision for long term evolution (LTE) systems. Based on the proposed architecture, the survivor memory can be eliminated totally, which will significantly reduce 50% of the total power dissipation. Finally, the proposed design consumes approximately 23.4K gates using 0.18 μm CMOS technology, and its power consumption is approximately 7.5 mW at 80 MHz.

关键词： Decoding Viterbi algorithm Educational institutions Memory architecture CMOS integrated circuits Wireless communication

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Recommendation of More Interests Based on Collaborative Filtering

Recommendation of More Interests Based on Collaborative Filt...

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International Conference on Advanced information Networking and Applications (AINA)

作者： Qian Wu Feilong Tang Li Li Leonard Barolli Ilsun You Yi Luo Huakang Li Department of Computer Science and Engineering Shanghai Jiaotong University Shanghai China School of Software Shanghai Jiaotong University Shanghai China Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan School of Information Science Korean Bible University Seoul South Korea China Xinhua Network Company Limited Beijing China

Collaborative Filtering is one of the most important techniques in recommender systems. Current researches on Collaborative Filtering focus on how to improve the accuracy. However, it is of the same importance to recommend more potential interests to users because many of them have more expectations for recommendation list besides the accuracy. Current recommender systems did not address this problem. This paper focuses on how to help users find more interests in the recommendation list. We propose an sampling-based algorithm Probabilistic Top-N Selection to recommend potential interests for users, and propose two metrics, average predicted rating and category coverage, to assess the quality of the recommendation list. Then we conduct a series of experiments on Movie Lens dataset, experimental results demonstrate that our algorithm can significantly improve user experience through providing them with more potential interests.

关键词： Prediction algorithms Probabilistic logic Collaboration Recommender systems Educational institutions Measurement

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Multiple vehicle driving control for traffic flow efficiency

Multiple vehicle driving control for traffic flow efficiency

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IEEE Symposium on Intelligent Vehicle

作者： Seong-Woo Kim Gi-Poong Gwon Seung-Tak Choi Seung-Nam Kang Myoung-Ok Shin In-Sub Yoo Eun-Dong Lee Emilio Frazzoli Seung-Woo Seo Singapore-MIT Alliance for Research Technology Massachusetts Institute of Technology USA Department of Electrical Engineering and Computer Science Seoul National University South Korea Laboratory for Information Decision Systems Massachusetts Institute of Technology USA

The dynamics of multi-agent in nature have been largely studied for a long time to investigate how the aggregation of agents can move smoothly in complex environments without collision. The main insights can be summarized such that the aggregated dynamics of animals and particles can be explained by an individual's simple rules. In a similar vein, we conjecture that such simple rules for vehicle maneuvering can accommodate the fluid flow of traffic and reduce car accidents in highway and urban areas. In this paper, we first show the Reynolds' three rules are applicable to autonomous driving on a single lane. Moreover, we provide additional requirements and algorithms for multiple lanes. Based on these results, we show that the proposed nature-inspired driving maneuver can increase traffic flow by 1) mitigating shockwave at bottlenecks and 2) extending the perception range for better path planning, which requires the support of the vehicle autonomy and wireless communication, respectively. Finally, we prove the feasibility of our work with experiments using multiple UAVs.

关键词： Vehicles Sensors Wireless communication Merging Acceleration Safety Mathematical model

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Social-Aware Routing for Wireless Mesh Networks

Social-Aware Routing for Wireless Mesh Networks

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IEEE Conference on Vehicular Technology (VTC)

作者： Shadi Saleh Basurra Yusheng Ji Marina De Vos Julian Padget Tim Lewis Simon Armour Department of Computer Science University of Bath UK Information Systems Architecture Science Research Division National Institute of Informatics Tokyo Japan Toshiba Research Europe Limited Bristol UK Department of Electrical and Electronic Engineering Bristol University UK

In wireless mesh networks (WMN), most routing algorithms apply broadcasting at some stage of the path discovery process. They thereby consume large chunks of the network throughput. Intelligent rebroadcast algorithms aim to reduce this overhead by calculating the usefulness of a rebroadcast and the likelihood of collisions. Unfortunately, this introduces latency and breaks the rebroadcast chain, resulting in reduced reachability. In this paper we present our Social-aware Routing Protocol with Parallel Collision Guidance Broadcasting for WMN (SCG). It reduces rebroadcasting without a loss in reachability and without a significant increase in latency. Our claims are validated through simulations comparing our algorithm with existing protocols.

关键词： Routing Routing protocols Broadcasting Delay Ad hoc networks Wireless mesh networks

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Acoustic novelty detection based on AHLAC and NMF

Acoustic novelty detection based on AHLAC and NMF

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IEEE International Symposium on Intelligent Signal Processing and Communication systems (ISPACS)

作者： Akira Sasou Nyamerdene Odontsengel Smart Communication Research Group Intelligent Systems Research Institute Advanced Industrial Science and Technology Tsukuba Ibaraki Japan Department of Computer Science Graduate school of System and Information Engineering University of Tsukuba Tsukuba Ibaraki Japan

ISBN: (纸本)9781467350839

The importance of video surveillance applications has been increasing with the increase of crime and terrorism. In addition to traditional video cameras, the use of acoustic sensors in surveillance and monitoring applications is also becoming increasingly important. In this paper, we apply High-Order Local Auto-Correlation (HLAC), which has succeeded in video surveillance applications, to extract features from acoustic signals in order to construct an acoustic surveillance system based on a novelty detection approach. We also apply Non-Negative Matrix Factorization (NMF) to this problem. Experiment results confirmed that the AHLAC-based method outperforms the NMF-based and the cepstrum-based methods under all SNR conditions. The combined NMF-AHLAC method was able to improve the Equal Error Rate (EER) at lower SNRs, although the EERs at higher SNRs tend to degrade.

关键词： Acoustics Time frequency analysis Vectors Feature extraction Matrix decomposition Video surveillance

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Applications of fuzzy logic and artificial neural network for solving real world problem

Applications of fuzzy logic and artificial neural network fo...

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International Conference on Advances in engineering, science and Management (ICAESM)

作者： R. Ramya R. Anandanatarajan R. Priya G. Arul Selvan Department of Computer Applications Research Scholor Dr. M.G. R. Educational & Research Institute Karaika Chennai Department of Electronics and Instrumentation Engineering Pondicherry Engineering College Puducherry Department of Software Engineering and Information Technology A.V.C. College of Engineering Nagapattinam District Tamil Nadu Department of Computer Science and Engineering EGS Pillay Engineering College Nagapattinam Tamil Nadu

Most of the neural networks in initial stage of enthusiasm, the field survived a period of frustration and disrepute. The reason for this is previous neuron doesn't do anything that conventional computers don't do already. Moreover they are observed to be too complex when noticed by humans as well as computers. Moreover we are furiously rising in fourth generation to increase the neural network standard in neurology and psychology. They are regularly used to model parts of living organisms and to investigate the internal mechanisms of the brain. At present the most exsisting aspect of neural networks is the possibility that some day `conscious' networks might be produced. Fuzzy logic and Neural network provide new method for desining control system and fuzzy logic and Neural networks can start with an approximate control knowledge base and refine it through inforcement learning.

关键词： Fuzzy logic Neural networks Biological system modeling Adaptation models Feeds Business

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Productive information system oriented trust chain scheme

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Telkomnika 2012年第5期10卷 1093-1100页

作者： Tian, Li-Ye Shen, Chang-Xiang Department of Electronic and Information Engineering Naval Aeronautical and Astronautical University China Beijing Key Laboratory of Trusted Computing College of Computer Science and Technology Beijing University of Technology China State Key Laboratory of Information Security Chinese Academy of Sciences Institute of Software China

Productive information system has high-level security requirements, but Trusted Computing Group's solution of trust chain isn't competent. After analysis and comparison of two different trust transfer ways, a new trust chain scheme was designed and its architecture was shown. With independent TPCM as a trust root, this scheme combined the advantages of linear and radial transfer. So that stronger cryptographic algorithm could be adopted by TPCM and applications' trust attenuation decreased a lot. This scheme was described formally by 6 linear temporal logic rules. It was proved that based on these rules, this scheme could transfer trust from trust root to applications. Meanwhile, it could actively report and handle exceptions in trust chain building and system running. Conclusion and future work were given at the end of this manuscript. © 2012 Universitas Ahmad Dahlan.

关键词： Chains

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Generation of discrete frequency and wavelength for secured computer networks system using integrated ring resonators

Generation of discrete frequency and wavelength for secured ...

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International Conference on computer and Communication engineering, ICCCE

作者： I. S. Amiri k. Sarkhanlou A. Nikoukar A. Shahidinejad J. Ali P. P. Yupapin Institute of Advanced Photonics Science Nanotechnology Research Alliance Universiti Teknologi Malaysia (UTM) Johor Bahru Malaysia Department of Computer Software Engineering Comprehensive University of Applied and Practical Sciences Ardebil Iran Faculty of Computer Science & Information Systems (FCSIS) Universiti Teknologi Malaysia (UTM) Johor Bahru Malaysia Advanced Research Center for Photonics Faculty of Science King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand

In this study, a system of discrete optical pulse generation via a series of microring resonator (MRR) is presented. Chaotic signals can be generated by an optical soliton or a Gaussian pulse within a MRR system. Large bandwidth signals of optical soliton are generated by input pulse propagating within the MRRs, which can be used to form continuous wavelength or frequency with large tunable channel capacity. Therefore, distinguished discrete wavelength or frequency pulses can be generated by using localized spatial pulses via a networks communication system. Selected discrete pulses are more suitable to generate high-secured quantum codes because of the large free spectral range (FSR). Quantum codes can be generated by using a polarization control unit and a beam splitter, incorporating to the MRRs. In this work, frequency band of 10.7 MHz and 16 MHz and wavelengths of 206.9 nm, 1448 nm, 2169 nm and 2489 nm are localized and obtained which can be used for quantum codes generation applicable for secured networks communication.

关键词： Optical solitons Optical filters Optical pulses Optical ring resonators Nonlinear optics Optical polarization

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