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2011 2nd International Conference on Education and Educational Technology(EET 2011)

作者： Fáber Giraldo Sergio F.Ochoa Laura Aballay Clifton Clunie Andrés Neyem Raquel Anaya System and Computer Engineering University of Quindío Computer Science Department University of Chile Informatics Institute National University of San Juan Computational Systems Engineering Technological University of Panama Computer Science Department Pontifical Catholic University of Chile System Engineering Department Universidad EAFIT

computer science students must be able to support the global software development phenomena;therefore they should enhance their teamwork, communication, negotiation, leadership and collaboration skills. It pushes the educational institutions to rethink the way in which they are transferring the soft skills, e.g. collaboration capabilities, to the new software engineers. Advances in developing platforms, wideband communications, global markets, technological trends and outsourcing promote the conception of a global software engineering. Trying to help address this issue, this paper describes the results of two experiences where a CODILA(Collaborative and Distributed Learning Activity) was used to solve a software engineering problem in a distributed way. These experiences involved students and instructors of eight Latin American universities. We have measured the development of collaboration skills and satisfaction level of computer science students participating in these distributed collaborative practices, and the obtained results are highly encouraging.

关键词： CODILA,distributed CSCL experience,interaction and communication design,experimental software engineering

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Feasibility implementation of voltage-current waveform telemetry system in power delivery system

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IEEJ Transactions on Fundamentals and Materials 2011年第4期131卷 288-294+10页

作者： Furukawa, Tatsuya Akagi, Keita Fukumoto, Hisao Itoh, Hideaki Wakuya, Hiroshi Hirata, Kenji Ohchi, Masashi Graduate School of Science and Engineering Saga University 1 Honjo-machi Saga 840-8502 Japan Department of Electric Control System NITTETSU ELEX CO. LTD. 1320-4 Maeda Outsuka Yahata-Higashi-ku Kitakyushu 805-8555 Japan Department of Electrical Electronics and Computer Engineering Faculty of Engineering Chiba Institute of Technology 2-17-1 Tsudanuma Narashino 275-0016 Japan

The electric power is indispensable for modern life. However, there is a problem of harmonic disturbance when the harmonic power runs into electronic devices. To overcome the problem and realize a stable supply of the electric power is an important issue. In this study, we have developed a voltage-current waveform telemetry system for the remote measurement of the harmonics in the power delivery lines. The system consists of sensors, preamplifiers, a single board computer, and power collectors. Improvements are made on all of these components except the sensors. The power collector is a coil that can be placed around the same power line that we measure. We have designed the power collector by a finite element method(FEM) so that it can provide enough electricity for the computer to work properly. Thus, no other power source such as a battery except the secondary rechargeable battery for the recovery is necessary at the measurement place. The preamplifier in the new system is a single-supply differential amplifier circuit, and the single board computer has an inexpensive SH-3 CPU. Through experiments, we have confirmed that the power collector can provide sufficient electricity and that the new system can successfully measure the waveforms and the harmonics in power delivery systems. © 2011 The Institute of Electrical Engineers of Japan.

关键词： Embedded systems

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Intrusion prevention by image based authentication techniques

Intrusion prevention by image based authentication technique...

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International Conference on Recent Trends in Information Technology (ICRTIT)

作者： M Sreelatha M Shashi M Roop Teja M Rajashekar K Sasank Department of Computer Science and Engineering RVR and JC College of Engineering Guntur Andhra Pradesh India Department of Computer Science and System Engineering Andhra University College of Engineering Visakhapatnam Andhra Pradesh India

PDAs are becoming one of the most popular gadgets all over the world. A PDA functions as a personal information manager. It has many functions. People store personal information like PIN numbers, account numbers etc. in the PDA. No one should access this information except the owner. Owner should be authenticated to use the gadget. Textual passwords are vulnerable to dictionary attacks, social engineering and shoulder surfing. Many graphical schemes are proposed to address these problems, but most of them are vulnerable to shoulder-surfing. Two authentication techniques-Pair based, and Text based Image Authentication are proposed in this paper which are resistant to shoulder surfing.

关键词： Authentication Personal digital assistants Resistance Image recognition Databases Force Dictionaries

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Complexity of the Stamp Folding Problem

Complexity of the Stamp Folding Problem

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5th Annual International Conference on Combinatorial Optimization and Applications (COCOA 2011)

作者： Umesato, Takuya Saitoh, Toshiki Uehara, Ryuhei Ito, Hiro School of Information Science Japan Advanced Institute of Science and Technology Ishikawa 923-1292 Japan ERATO MINATO Discrete Structure Manipulation System Project Japan Science and Technology Agency Hokkaido 060-0814 Japan Department of Communications and Computer Engineering Graduate School of Informatics Kyoto University Kyoto 606-8501 Japan

ISBN: (纸本)9783642226151

For a given mountain-valley pattern of equidistant creases on a lone paper strip, there are many folded states consistent with the pattern. Among these folded states, we like to fold a paper so that the number of the paper layers between each pair of hinged paper segments. which is called the crease width at the crease point, is minimized. This problem is called the stamp folding problem and there are two variants of this problem;minimization of the maximum crease width, and minimization of the total crease width. This optimization problem is recently introduced and investigated from the viewpoint of the counting problem. However, its computational complexity is not known. In this paper, we first show that the minimization problem of the maximum crease width is strongly NP-complete. Hence we cannot solve the problem in polynomial time unless P=NP. We next propose an algorithm that solves the minimization problem. The algorithm itself is a straightforward one, but its analysis is not trivial. We show that this algorithm runs in O(n(2)((n+k)(k))) time where n is the number of creases and k is the total crease width. That is, the algorithm runs in O(n(k+2)) time for a constant k. Hence we can solve the problem efficiently for a small constant k.

关键词： linkage NP-complete optimization problem pleat folding rigid origami

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Retraction notice to ‘‘Specification and Verification of Dynamic Evolution of Software Architectures” [SYSARC 56 (10) (2010) 523–533]

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Journal of systems Architecture 2012年第8期58卷 338-338页

作者： Xu Hongzhen Zeng Guosun Department of Computer Science and Technology Tongji University Shanghai 201804 China Department of Computer Science and Technology East China Institute of Technology Fuzhou Jiangxi Province 344000 China Application of Nuclear Technology Engineering Center of Ministry of Education Nanchang Jiangxi Province 330013 China Embedded System and Service Computing Key Lab of Ministry of Education Shanghai 201804 China

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Sustainable Service Level Agreements

Sustainable Service Level Agreements

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IEEE International Conference on Services Computing (SCC)

作者： Thiago Barroero Gianmario Motta Marco Durante Department of Computer Engineering and System Science University of Pavia Pavia Italy Assocontact Rome Italy

Our paper provides a method to manage sustainable service levels in call centers. We defined a service level management process and a related capacity and workforce management that considers Erlang-A operational model for staffing levels. Based on such model, we compute the minimum sustainable price for a service contract based on the fixed service levels, and enable transparent pricing against a certified service level. The model has been implemented in a tool and are being tested in real call centers.

关键词： Estimation Computational modeling Gallium nitride Testing Analytical models Job shop scheduling Manufacturing

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Optimized Distributed Control and Network Topology Design for Interconnected systems

Optimized Distributed Control and Network Topology Design fo...

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IEEE Conference on Decision and Control

作者： Dominic Gross Olaf Stursberg Institute of Control and System Theory Department of Electrical Engineering and Computer Science University of Kassel (Germany)

ISBN: (纸本)9781612848006

This paper considers optimized network topology design and distributed control for linear discrete-time systems consisting of subsystems interconnected through states, inputs, and a cost function. By using a distributed control law, which makes use of the communicated states of other subsystems, closed-loop performance is increased at the expense of communication costs. This raises the question of how to find a topology and associated distributed control law with optimal trade-off between communication costs and closed-loop performance. As an answer to this question, we propose an approach to simultaneous optimization of network topology and control law with respect to a cost function which combines a quadratic performance criterion with costs associated to the presence of communication links. The problem is formulated as mixed-integer semi-definite problem (MISDP) where the discrete optimization of the network topology subject to communication constraints and embedded subproblems for structured controller synthesis lead to an upper bound for the combined cost. An example is used to illustrate the method.

关键词： Network topology decentralised control control law Cost functions Performance metrics Communication Research SUB-system large-scale systems closed-loop performance

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system system configuration and evaluation for optical sled drive using constraint-tuning ultrasonic actuator

System System configuration and evaluation for optical sled ...

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2011 International Conference on Applied Mechanics and Manufacturing Technology, AMMT'11

作者： Lai, Ming-Hung Wen, Fuh-Liang Shen, Yu-Lin Ouyang, Minsun Department of Engineering and System Science National Tsing-Hua University Hsinchu 30043 Taiwan Department of Mechanical and Computer-Aided Engineering Graduate Institute of Automation and Mechatronics St.John's University Tamsui New Taipei City 25135 Taiwan Department of Mechanical Engineering University of New Mexico Albuquerque NM 87131 United States

ISBN: (纸本)9783037852309

Through the estimated method for constraint-tuning modified-mode (CTMM), an innovative thin-disc piezoelectric ultrasonic actuator is used to drive an optical sled in this study. With four screws positioned on the thin-disc actuator at the angle distribution of 0°, 90°, 180°, and 320°, both modified modes of ((1, 2))C and ((1, 1))S in vibration provide an approximate equilibrium force to push an optical sled in bilateral movement. The innovative ultrasonic actuator has the vibrator's compact and thinner structure, a thickness of 3 millimeters, without a gearbox rather than a conventional DC sled motor. Using contact friction to drive an optical sled with quick tracking in bilateral motion, experimental results demonstrate obtaining the desired function by a proposed single-phase, bi-frequency LC resonant driving circuit as well as remaining the original sled controller. The general specification of linear speed achieves 200-300 mm/s at less power dissipation for pushing the CD652A BenQ sled drive with 1.0 N output force and 20%-33% efficiency. © (2011) Trans Tech Publications.

关键词： Tuning

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Applying a distributed CSCL activity for teaching software architecture

Applying a distributed CSCL activity for teaching software a...

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

ISBN: (纸本)9780956426383

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. © 2011 IEEE.

关键词： Software architecture

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A system to discover correlations within a biological pathway between the expression levels of genes

A system to discover correlations within a biological pathwa...

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2011 11th IEEE International Conference on Bioinformatics and Bioengineering, BIBE 2011

作者： Wu, Li-Ching Chang, Cheng-Wei Chao, Tsung-Ming Yeh, Rong-Hwei Horng, Jorng-Tzong Institute of System Biology and Bioinformatics National Central University Taiwan Department of Information Management Hsing Wu College Taiwan Department of International Business Ching Yun University Taiwan Department of Photonics and Communication Engineering Asia University Taiwan Department of Computer Science and Information Engineering National Central University Taiwan Department of Bioinformatics Asia University Taiwan

ISBN: (纸本)9780769543918

Current pathway presentation method to the biologist is static graph. The analysis of differentially expressed genes using microarray gene expression data can help to find factors that affect diseases. However, the differentially expressed genes that are identified may be too large in number and it's difficult for biologist to pinpoint the correlations between genes and crucial points on pathway interactively. In this study, we propose a method that attempts to avoid this problem and allows the discovery of greater biological meaning than the traditional method. We select a gene pair set of interacting genes in a biological pathway and investigate the correlation in expression between the gene pairs under different condition (such as relapsed and non-relapsed breast cancer) using microarray gene expression data. We tested the approach using breast cancer relapsed and non-relapsed datasets in order to demonstrate that our method is both useful and reliable;very stable results were obtained when the same microarray platform was used. We finally use an interface to display correlations within a biological pathway. © 2011 IEEE.

关键词： Gene expression

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