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International Conference on Information Society (i-Society)

作者： Fáber D. Giraldo Sergio F. Ochoa Myriam Herrera Andrés Neyem José Luis Arciniegas Clifton Clunie Sergio Zapata Fulvio Lizano System and Computer Engineering University of Quindío Armenia Colombia Computer Science Department University of Chile Santiago Chile Informatics Institute National University of San Juan San Juan Argentina Computer Systems Engineering Technical University of Panama Panama Computer Science Department Pontifical Catholic University of Chile Santiago Chile IDIS University of Cauca Popayan Colombia Informatics School National Autonomous University of Costa Rica Costa Rica

Teaching and learning software engineering have been recognized as important challenges for computer science students and instructors. These challenges become stronger if we consider the distributed software development scenario that is gaining space everyday into the software industry. In order to help address this challenge, this article introduces a Collaborative and Distributed Learning Activity (CODILA). This collaborative activity helps students to reach the professional skills required in the professional work, and instructors to perform such transfer process. The paper also presents and discusses the obtained results from a particular CODILA, which address the challenge of designing a software architecture of a communication infrastructure in a distributed way. Six Latin American universities participated in the activity. The obtained results were satisfactory and indicate these types of experiences can be used to address the stated challenges.

关键词： Software computer architecture

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Distributed Power and Rate Allocation with Fairness for Cognitive Radios in Wireless Ad Hoc Networks

Distributed Power and Rate Allocation with Fairness for Cogn...

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2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

作者： Songtao Guo Yunqiang Zhang Yuanyuan Yang High Performance Networking Research Center State Key Laboratory of Power Transmission Equipment and System Security College of Computer Science Chongqing University Chongqing China Department of Electrical and Computer Engineering Stony Brook University Stony Brook NY USA

In this paper, we propose a distributed resource allocation framework for cognitive radio networks by using the orthogonal frequency division multiple access (OFDMA) modulation. We jointly consider the constraints of quality of service (QoS), maximum power, and minimum rates in the network to obtain optimal available subcarrier sets and transmission power. The fairness of resource allocation is guaranteed by incorporating the probability that a subcarrier is occupied into the link capacity expression. We present a distributed subcarrier selection and power allocation algorithm and evaluate the algorithm through simulations. Our results confirm that the proposed algorithm outperforms the existing algorithms in terms of throughput, the number of secondary links admitted, and the fairness of resource allocation.

关键词： Resource management Optimization Cognitive radio Ad hoc networks Interference Throughput Joints

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Quantum-limited phase-matching effect in a Λ-type laser system

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Physical Review A 2011年第6期83卷 063846-063846页

作者： Deshui Yu Jingbiao Chen Department of Applied Physics The University of Tokyo Bunkyo-ku Tokyo 113-8656 Japan Institute of Quantum Electronics and State Key Laboratory of Advanced Optical Communication System & Network School of Electronics Engineering & Computer Science Peking University Beijing 100871 P.R. China

The theory of a quantum-limited phase-matching effect in a Λ-type lasing system is studied in detail based on the quantum Langevin approach. Two quasimonochromatic fields are directly generated based on two lasing transitions. We find that the coherence between two lasers can well exceed the linewidth of either laser field. This result denotes that two field phases match each other although either laser field has a high phase fluctuation. Unlike the phase-matching effect based on atomic absorption, the final coherence between two laser fields here is not limited by saturation broadening, and the higher laser intensities lead to a higher coherence. Additionally, based on a linear stability analysis, we find that the instability of the field steady state can substantially restrict the occurrence of this phase-matching effect in the bad-cavity limit for a high pump rate. We also discuss the spectrum of amplitude fluctuations of output fields, and the result shows that the squeezing of amplitude fluctuations at low frequencies for a single field oscillating inside the cavity is damaged in the case of two fields oscillating.

关键词： Phase matching

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A Self Learning VLSI Lab along with Web-Based Platform to Design Schematics and Layouts

A Self Learning VLSI Lab along with Web-Based Platform to De...

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International Workshop on Technology for Education, T4E

作者： Shashank Sharma Syed Azeemuddin Mohd Anwar Computer Science Engineering Department International Institute of Information Technology Hyderabad India Center of VLSI & Embedded System Technology International Institute of Information Technology Hyderabad India CVEST IIIT-Hyderabad Hyderabad India

We present a web-based environment along with an interactive interface for VLSI schematic design, simulation, and layout design. It consist of 10 experiments starting from transistor level design of inverter, then some basic gates such as NAND, NOR, XOR etc, finally design of D latch and flip flop. In each experiment student will learn how to design VLSI circuits both schematic and layout. It also consists of experiment components such as objective, introduction, quiz, and theory etc. which gives step by step explanation of each experiment. It is a powerful self learning supplement for the VLSI design course offered in undergraduate engineering program. Along with teaching schematics and layouts of circuits, this virtual lab also consists of some experiment explaining about SPICE coding, VHDL and Verilog coding. An interactive panel is given in which student will write programming codes, simulate and see real time waveforms. The web based schematic and layout editor is designed to maintain the commonality with EDA tools such as Cadence Virtuoso, HSpice Cosmos, Tanner tools etc.

关键词： Very large scale integration Integrated circuit modeling Java Layout Browsers Servers Computational modeling

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A new spatial network clustering approach for aggregate query processing

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ICIC Express Letters 2011年第4 B期5卷 1347-1352页

作者： Ma, Yonggang Tan, Guozhen Wang, Wei Li, Xiaolei School of Computer Science and Technology Dalian University of Technology No. 2 Linggong Road Ganjingzi District Dalian 116023 China Department of Embedded System Engineering Dalian Neusoft Institute of Information No. 8 Ruanjianyuan Road Dalian 116023 China

If the data are organized effectively in spatial networks, it is possible to reduce the cost of the aggregate network operations during query processing. So different techniques based on the clustering graph model are proposed to solve the spatial network clustering problem. However, the clustering graph model can not correctly capture the disk access costs of aggregate network operations. Thus, we propose an improved clustering approach to overcome the shortcomings of graph clustering model. The proposed approach aims to minimize the total number of disk page accesses in aggregate network operations while reducing the number of allocated disk pages as far as possible. The experimental results show that the proposed approach is very effective in reducing the number of disk accesses incurred by the network operations. ICIC International © 2011.

关键词： Query processing

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Using P2P Networks to Repair Packet Losses in Digital Video Broadcasting systems

Using P2P Networks to Repair Packet Losses in Digital Video ...

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International Conference on Parallel and Distributed systems (ICPADS)

作者： Yung-Tsung Weng Ce-Kuen Shieh Tzu-Chi Huang Yu-Ben Miao Department of Management Information System Far East University Tainan Taiwan Institute of Computer and Communication Engineering Department of Electrical Engineering National Cheng Kung University Tainan Taiwan Department of Electric Engineering Lunghwa University of Science and Technology Taoyuan Taiwan Information and Communications Research Laboratories Industrial Technology Research Institute Hsinchu Taiwan

Digital multimedia broadcasting services require resiliency against signal fading due to signal encounters with bad weather, terrain obstructions, such as tree, building, etc. There are several solutions that use peer-to-peer network to repair packet losses. But they have some shortcomings such as long lookup latency, control message overhead, flash crowd problem and low chunk availability. In this paper we propose a novel solution that considers load distribution in structured peer-to-peer networks and repairing packet losses in short lookup latency. Our proposed solution doesn't need to modify the codec technology for multimedia stream. Our proposed solution can achieve load evenly distributed, high chunk availability, short lookup latency and low control message overhead by using peer-to-peer network to repair packet losses in digital multimedia broadcasting systems.

关键词： Peer to peer computing Digital video broadcasting Media Message systems Streaming media Receivers Multimedia communication

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Yet an efficient algorithm for computing reduced area VLSI channel routing solutions with floating terminals

Yet an efficient algorithm for computing reduced area VLSI c...

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International Conference on computer and Information Technology (ICCIT)

作者： Achira Pal Swagata Saha Sau Tarak N. Mandal Rajat K. Pal Alak K. Datta Atal Chaudhuri Harinavi Subhasini Balika Sikshalaya West Bengal India Department of Computer Science Sammilani Mahavidyalaya Baghajatin Kolkata West Bengal India IBM Pvt Ltd Kolkata West Bengal India Department of Information Technology Assam University Cachar Assam India Department of Computer and System Sciences Visva-Bharati Birbhum West Bengal India Department of Computer Science and Engineering Jadavpur University Kolkata West Bengal India

The main objective of VLSI channel routing problem is to compute a feasible reduced area routing solution which reduces the height of the channel. A channel is a rectangular routing region with two open ends (left and right) and two sets of fixed terminals (top terminals and bottom terminals) are placed in the upper and lower sides of the channel. A net is a set of terminals that need to be electrically connected (usually using rectilinear wiring). Routing is a process to interconnect all nets within the channel considering all constraints (horizontal and vertical constraints) of that channel. The terminals along the left and right ends of the channel are not fixed, known as floating terminals. Generally, channel routing problem for area minimization is NP-complete. So developing a heuristic algorithm is really interesting. In this paper, we consider a general channel routing problem for channel instances with fixed and floating terminals, and develop an efficient graph based heuristic algorithm for reducing area in the reserved two-layer Manhattan channel routing model.

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Cognitive Radio Network as Wireless Sensor Network (I): Architecture, Testbed, and Experiment

Cognitive Radio Network as Wireless Sensor Network (I): Arch...

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IEEE National Aerospace and Electronics Conference

作者： Jingzhi Yu Changchun Zhang Zhen Hu Feng Lin Nan Guo Michael Wicks Robert C. Qiu Kenneth Currie L. Li Cognitive Radio Institute Department of Electrical and Computer Engineering Center for Manufacturing Research Tennessee Technological University ISR Group of Sensor System University of Dayton Research Institute Center for Manufacturing Research Tennessee Technological University Department of Computer Science Center for Manufacturing Research Tennessee Technological University

ISBN: (纸本)9781457710407

This paper explores the vision of a dual-use sensing/communication system based on Cognitive Radio Network (CRN). The motivation of the paper is to push the convergence of sensing and communication systems into a unified cognitive network. The concept design of this sensing/communication system is presented along with potential functions and challenges. A through tree target detection using real data collected by CRN testbed is demonstrated. The CRN testbed will be built based on Rice WARP nodes. To further exploit the advantages of dynamic spectrum access and frequency diversity, multi-frequency signal, which is similar to OFDM signal, are employed to for detection experiment in the harsh radio environment. The experiment results illustrate the vision of employing a CRN as wireless sensor network.

关键词： Cognitive radio networks Wireless sensor network Orthogonal frequency-division multiplexing (OFDM) Software defined radio (SDR)

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Providing feedback on emotional experiences and decision making

Providing feedback on emotional experiences and decision mak...

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AFRICON Conference

作者： Jana Machajdik Julian Stöttinger Ester Danelova Martin Pongratz Lukas Kavicky Roberto Valenti Allan Hanbury Computer Vision Lab Vienna University of Technology Austria Dept. of Information Engineering and Computer Science University of Trento Italy Department of Psychology Masaryk University Institute of Computer Technology Vienna University of Technology Intelligent System Lab Amsterdam University of Amsterdam Information Retrieval Facility Vienna Austria

We present a novel lifelog system concept created to provide a human user with feedback on their conscious and unconscious emotional reactions and encourage the process of self-reflection by looking into an affective mirror. The emotion of the user is deduced from biometric data and enhanced by affective sound analysis and facial expression recognition of faces of the weares conversational partners. These high-level analyses also offer information about the social context of the user. All of the recorded data is processed using a novel modification of the spreading-activation theory which is used to model human-like associative thinking.

关键词： Humans Visualization Sensors Heart rate Skin Mirrors Biomedical measurements

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Design of grid multi-wing butterfly chaotic attractors from piecewise Lü system based on switching control and heteroclinic orbit

Design of grid multi-wing butterfly chaotic attractors from ...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Simin Yu Jinhu Lü Guanrong Chen Xinghuo Yu College of Automation Guangdong University of Technology Guangzhou China School Electrical Computer Engineering RMIT University Australia Acad. Mathematics & System Science Chinese Academy and Sciences Beijing China Department Electrical Engineering City University of Hong Kong Hong Kong China School Electrical Computer Engineering RMIT University Melbourne VIC Australia

Over the last two decades, multi-scroll chaos generation has seen promising advances and becomes an active research field. This paper initiates a novel approach to design various grid multi-wing butterfly chaotic attractors from piecewise Lü system based on switching control and heteroclinic orbit. It should be especially pointed out that these generating multi-wing chaotic attractors are chaotic in the sense of Smale horseshoe from Shilnikov theorem. Moreover, there are some potential engineering applications in the future because of the simplicity of the proposed design approach.

关键词： Chaos Switches Orbits Linear systems Manifolds Bifurcation

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