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Brazilian Symposium on Software engineering (SBES)

作者： Marcelo Schots Cl'udia Werner Manoel Mendonça Systems Engineering and Computing Program COPPE Federal University of Rio de Janeiro Rio de Janeiro Brazil Computer Science Department Federal University of Bahia Rio de Janeiro Brazil

The creation of tools, techniques and methodologies to support the manipulation of large data sets has been receiving special attention of both scientific and industrial communities, in order to discover new ways of dealing with the underlying information, including learning purposes, identification of patterns, decision making support, amongst others. However, making use of computing resources to enhance awareness and understanding of software information and the software itself is still a challenge in software/systems engineering, since it involves the identification of suitable mechanisms, adequate abstractions, and studies on stimulation of the human perceptive and cognitive abilities. This paper presents some of the challenges in this context, based on current trends of software development lifecycle, program comprehension, and software engineering education. At the end, a special focus is given on ongoing research on using and improving current mechanisms for supporting software reuse practices and software comprehension in general.

关键词： Software Software engineering Education Visualization Conferences Industries Data visualization

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A Fuzzy-Based Reliability System for JXTA-Overlay P2P Platform Considering Actual Behaviour and Amount of Data Exchanged between Peers

A Fuzzy-Based Reliability System for JXTA-Overlay P2P Platfo...

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International Conference on Network-Based Information systems (NBIS)

作者： Kouhei Umezaki Evjola Spaho Leonard Barolli Fatos Xhafa Muhammad Younas Jiro Iwashige Graduate School of Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Languages and Informatics Systems Technical University of Catalonia Barcelona Spain Department of Computing and Communication Technologies Oxford Brookes University Oxford UK

Peer to Peer (P2P) systems recently are receiving a lot of attention from the researchers. In such systems, peers are heterogeneous in providing resources and services. Peers do not have the same reliability so it is necessary to evaluate their trustworthiness for a reliable sharing of the resources and services. In this paper, we propose a fuzzy-based system for peer reliability in JXTA-Overlay P2P platform. We took in consideration two parameters: Actual Behaviour Criterion (ABC) and Amount of Data Exchanged (ADE) between peers. We evaluate the performance of the proposed system by computer simulations. The simulation results shows that the proposed system has a good behaviour and it can be used successfully to select the most reliable peer to execute the tasks.

关键词： Reliability Peer to peer computing Pragmatics Fuzzy logic Process control Protocols Simulation

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On efficient neighbor sensing in vehicular networks

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Computer Communications 2012年第13期35卷 1639-1648页

作者： Zuoxiang Deng Yanmin Zhu Minglu Li Department of Computer Science and Engineering Shanghai Jiao Tong University Dongchuan Road No. 800 Minhang District Shanghai 200240 PR China Shanghai Key Laboratory of Scalable Computing and Systems Department of Computer Science and Engineering Shanghai Jiao Tong University Dongchuan Road No.800 Minhang District Shanghai 200240 PR China

Efficient neighbor sensing in vehicular wireless networks is crucial to a number of applications such as driving safety and data delivery. For neighbor sensing, a vehicle has to send probe messages. The characteristics of vehicular networks raise several great challenges for real-time neighbor sensing. First, simultaneous wireless transmissions lead to packet collision. The aggressiveness of probe message transmission has a great impact on sensing latency, and it is difficult to determine the optimal aggressive degree of probe message transmission. Second, the number of neighbors of a vehicle in an urban environment may change over time and a static control method for probe message transmission results in poor performance. We design a protocol ENS for efficient neighbor sensing, in which each vehicle performs a randomized broadcast of probe messages in fix-length frames. To approach optimal neighbor sensing, ENS adopts an adaptive probe message transmission strategy. Based on an analytical framework, we theoretically determine the optimal configurations for number of probe messages and frame length. We have conducted trace driven simulation experiments, and performance results demonstrate that ENS outperforms two other alternative algorithms. In addition, more than 90% of association latencies are less than 600 ms, and more than 90% of disassociation latencies are less than 200 ms under a typical urban setting.

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Stability Analysis for High Frequency Networked Control systems

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IEEE Transactions on Automatic Control 2012年第10期57卷 2694-2700页

作者： Hongjiu Yang Yuanqing Xia Peng Shi Mengyin Fu Institute of Electrical Engineering Yanshan University Qinhuangdao China School of Automation Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing Institute of Technology Beijing China School of Engineering and Science Victoria University Melbourne VIC Australia Department of Computing and Mathematical Sciences University of Glamorgan Pontypridd UK

This note generalizes the stability analysis for a high frequency networked control system. The high-frequency networked control system is described by a delta operator system with a high frequency constraint. Stability conditions are given for the high frequency delta operator system. Furthermore, by developing the generalized Kalman-Yakubovic-Popov lemma, improved stability conditions are also presented in terms of linear matrix inequalities. Some experiment results are presented to illustrate the effectiveness of the developed techniques.

关键词： Stability analysis Delay Linear matrix inequalities Frequency control Educational institutions Power system stability Numerical stability

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Determination of the effective constitutive parameters of active transmission line metamaterials

Determination of the effective constitutive parameters of ac...

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International Workshop on Metamaterials

作者： Li-Ming Si Weiren Zhu Xin Lv Beijing Key Laboratory of Millimeter Wave and Terahertz Technology Department of Electronic Engineering School of Information and Electronics Beijing Institute of Technology Beijing China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

This paper presents an alternative approach, based on the transmission line theory, for determination of the attenuation constant (α), phase constant (β), characteristic impedance (Zo), refractive index (n), effective permittivity (ε) and effective permeability (μ) for active transmission line (TL) metamaterial. When active elements are introduced into the lossy TL meta-material, the gain acquired from the active elements should be evaluated quantitatively against the attenuation due to the loss in order to avoid ambiguities in determining the signs of the effective constitutive parameters. In stead of directly determining the characteristic impedance from S-parameters, we introduce the reflection coefficient as an intermediate quantity to assist solving the characteristic impedance. This paper shows demonstration of this method with an example of active TL metamaterial.

关键词： Metamaterials Impedance Refractive index Attenuation Magnetic materials Permeability

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Clustering Students Based on their Annotations of a Digital Text

Clustering Students Based on their Annotations of a Digital ...

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International Workshop on Technology for Education, T4E

作者： Keith Ying Maiga Chang Andrew F. Chiarella Kinshuk Jia-Sheng Heh Department of Information and Computer Engineering Chung-Yuan Christian University Chungli Taiwan School of Computing and Information Systems Athabasca University Athabasca Canada Centre for Social Sciences Athabasca University Athabasca Canada

Students often annotate texts they are reading using highlighting, underlining, and written comments and marks in the margins of the text. These may serve various functions and will reflect each student's goals and understanding of the text. This research proposes two simple biology-inspired approaches to represent the patterns of student annotations and to cluster students based on the similarity between their annotations; the annotations produced were simple highlighting. To verify the effectiveness of the proposed approaches, the research compared the processing speed of these approaches with generic hierarchical clustering algorithm implemented in Matlab and compared the accuracy of the clusters with the clusters created by human raters. The results show that both of the proposed approaches are more efficient and accurate than the generic hierarchical clustering algorithm. The proposed methodology can be implemented as an add-on to existing learning management systems and e-book readers, to automatically offer the students important notes and annotations conducted by others (either peers or students in the past) who have similar annotation behaviour pattern and style to the students.

关键词： Biological cells Humans Standards Benchmark testing Clustering algorithms Clustering methods Educational institutions

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Optimal adaptive antijamming in wireless sensor networks

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International Journal of Distributed Sensor Networks 2012年第12期2012卷 1-9页

作者： Zhu, Yanmin Li, Xiangpeng Li, Bo Department of Computer Science and Engineering Shanghai Jiao Tong University Minhang Shanghai 200240 China Shanghai Key Lab of Scalable Computing and Systems Shanghai Jiao Tong University Minhang Shanghai 200240 China Department of Computer Science and Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong

Wireless sensor networks have been widely applied to various application domains such as environmental monitoring and surveillance. Because of reliance on the open transmission media, a sensor network may suffer from radio jamming attacks, which are easy to launch but difficult to defend. Attacked by jamming signals, a sensor network may experience corrupted packets and low network throughput. A number of defense techniques have been proposed. However, each defense technique is suitable for only a limited range of network and jamming conditions. This paper proposes an adaptive approach to antijamming for sensor networks by combining the strength of state-of-the-art antijamming techniques, which enables each node to adaptively select the optimal antijamming technique for different jamming conditions. The great challenge is that the sensor network undergoes varying jamming conditions over time. We address this challenge by formulating the antijamming problem of the sensor network as a Markov decision process and propose an efficient algorithm for computing the best antijamming strategy. By comprehensive simulation experiments, we demonstrate that a sensor network using the derived antijamming strategy can well defend from radio jamming attacks and in the meanwhile retain high energy efficiency. © 2012 Yanmin Zhu et al.

关键词： Sensor nodes

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A Recursive Local Linear Estimator for Identification of Nonlinear ARX systems *

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IFAC Proceedings Volumes 2012年第16期45卷 1517-1522页

作者： Wen-Xiao Zhao Wei Xing Zheng Er-Wei Bai Key Laboratory of Systems and Control Academy of Mathematics and Systems Science CAS Beijing P. R. China National Center for Mathematics and Interdisciplinary Sciences CAS Beijing P. R. China School of Computing Engineering and Mathematics University of Western Sydney Penrith NSW 2751 Australia Department of Electrical and Computer Engineering University of Iowa Iowa City IA 52242 USA

In this work, we propose a recursive local linear estimator (RLLE) for identification of nonlinear autoregressive systems with exogenous inputs, along with an analysis of its strong consistency and asymptotical mean s... 详细信息

关键词： Nonlinear ARX systems recursive identification local linear estimator almost sure convergence

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A Situated Game for Autistic Children Learning Activities of Daily Living

A Situated Game for Autistic Children Learning Activities of...

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IEEE International Workshop on Digital Game and Intelligent Toy Enhanced Learning (DIGITEL)

作者： Maiga Chang Rita Kuo Chun-Wei Lyu Jia-Sheng Heh School of Computing and Information Systems Athabasca University Canada Academic and Industrial Research Centre Knowledge Square Inc. Taiwan Department of Information and Computer Engineering Chung-Yuan Christian University Taiwan

Daily living skills are difficult for autistic children to learn because they have low motivation in learning new things. Some research has developed virtual environment to assist parents and teachers teaching autistic children daily living skills, educators still need to spend a lot of time in preparing personalized and more realistic tasks for children to practice. This research designs an activity generation mechanism by measuring activity's weight with fuzzy theory and rough set's help. Based on the activity generation mechanism and weight measurement, a Flash-based situated game is developed for providing autistic children personalized and non-repeated practices of activities of daily living. An evaluation plan of the pilot for verifying the effectiveness of the game and gathering the users' (include teachers, parents, and the autistic children) perceptions toward the game and the game-play is designed.

关键词： Games Videos Autism Automata Weight measurement Educational institutions

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International Conference on Computer Communications and Networks (ICCCN)

作者： Yuehua Wang Zhong Zhou Ling Liu Liang Cheng Wei Wu State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University China Georgia Institute of Technology College of Computing Georgia Institute of Technology USA Department of Computer Science and Engineering Lehigh University USA

Group communication is essential for multi-user applications. However, due to unpredictable node departures and non-deterministic network partitions, providing reliable and scalable group communication services is challenging when the applications are utilized by the users with heterogeneous capacities on a large scale. To address this challenge, we propose a novel replication scheme to achieve high reliability and low-cost scalability in group communication with following three features. First, it introduces a new concept of replication based on topological similarity, which empowers each node with an ability of measuring similarity between the nodes in topology. By eliminating the topological similarity between the replicas, it intelligently mitigates service interruptions caused by node failures and network partitions. Second, instead of specifying the number of replicas, it provides a technique for nodes to dynamically adapt the replication placement schemes by exploiting functionality importance of the nodes in the group- communication session. It eliminates the bottleneck problem and improves the network resource utilization. Third, the scheme is self-converging and it can stabilize within a few adaptations even facing a high churn rate. Extensive simulations show that it yields significant improvements in reduction of replication overhead and service interruption when comparing to existing approaches.

关键词： Random access memory Topology Maintenance engineering Reliability theory Computer network reliability

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