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9th International computer-Supported Collaborative Learning Conference: Connecting computer-Supported Collaborative Learning to Policy and Practice, CSCL 2011

作者： Evans, Michael A. Crider, Jeremy Motto, Andrea Brunger, Adrienne Wilkins, Jesse L.M. Department of Learning Sciences and Technologies Virginia Tech Blacksburg VA 24061 United States Department of Computer Science Virginia Tech Blacksburg VA 24061 United States Department of Teaching and Learning Virginia Tech Blacksburg VA 24061 United States Department of Mathematics Virginia Tech Blacksburg VA 24061 United States

ISBN: (纸本)9780578091532

For the reported work we focus on several iterations to refine a tangram application for a multi-touch, multi-user interactive surface, the SMART Table™ by SmartTech. We recruited one PreK teacher and six students (ages 4 to 5) from the university's child development center to capture usability data and reactions to design choices. Preliminary findings have guided development to support research into the socio-cognitive parameters of collaboration while exploring the limitations of the commercial technology to support CSCL. © ISLS.

关键词： E-learning

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A complete gradient clustering algorithm

A complete gradient clustering algorithm

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3rd International Conference on Artificial Intelligence and Computational Intelligence, AICI 2011

作者： Kulczycki, Piotr Charytanowicz, Malgorzata Systems Research Institute Polish Academy of Sciences Center for Stochastic Data Analysis Methods Newelska 6 PL-01-447 Warsaw Poland Cracow University of Technology Department of Automatic Control and Information Technology Cracow Poland Catholic University of Lublin Institute of Mathematics and Computer Science Lublin Poland

ISBN: (纸本)9783642238956

A gradient clustering algorithm, based on the nonparametric methodology of statistical kernel estimators, expanded to its complete form, enabling implementation without particular knowledge of the theoretical aspects or laborious research, is presented here. The possibilities of calculating tentative optimal parameter values, and then - based on illustrative interpretation - their potential changes, result in the proposed Complete Gradient Clustering Algorithm possessing many original and valuable, from an applicational point of view, properties. Above all the number of clusters is not arbitrarily imposed but fitted to a real data structure. It is also possible to increase the scale of the number (still avoiding arbitrary assumptions), as well as the proportion of clusters in areas of dense and sparse situation of data elements. The method is universal in character and can be applied to a wide range of practical problems, in particular from the bioinformatics, management and engineering fields. © 2011 Springer-Verlag.

关键词： Clustering algorithms

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Time-complemented event-driven control framework for distributed motion control systems based on IEC 61499 and IEEE 1588

Time-complemented event-driven control framework for distrib...

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IEEE International Conference on Industrial Informatics (INDIN)

作者： Cheng Pang Valeriy Vyatkin Cesare Fantuzzi Department of Electrical and Computer Engineering University of Auckland Auckland New Zealand Department of Science and Methods for Engineering University of Modena and Reggio Emilia Reggio Emilia Italy

This paper presents a preliminary study towards the applications of IEC 61499 Function Block standard in distributed motion control systems, where synchronization is of crucial importance. In particular, an investigation on the possibilities of applying event-driven function blocks in the time-based motion control system has been performed on the SIDEL SL90 packaging machine's control system. To achieve the required high-precision time synchronization and to provide the reference time, the IEEE 1588 Precision Time Protocol has been implemented in this work as the essential part of the packaging control system. A time-complemented event-based control framework has also been proposed.

关键词： Clocks Synchronization Labeling IEC standards Protocols Control systems

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A fast algorithm for building spatial fingerprints database of indoor localization

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International Review on computers and Software 2011年第7期6卷 1198-1202页

作者： Wang, Shengchun Xiao, Helong Tang, Wensheng Department of Computer Teaching Hunan Normal University Changsha 410081 Hunan China School of Physics and Information Science Hunan Normal University Changsha 410081 Hunan China

Spatial location fingerprinting in RF localization has become one of the research hotspots in current indoor localization field. A key idea of this technology is how to generate the database of location fingerprinting by using received signal strength indication (RSSI) values received from the known beacon access pointers. Conventional methods sample the area directly, and it is a time-consuming work. To reduce the offline phase of the indoor localization, in this paper we proposed a novel method to generate the database by using Least Squares Support Vector Machine (LSSVM). The result of our experiment shows that compared to conventional method, less samples are required to get same accuracy of the localization in our algorithm. The algorithm we proposed provides simpler and more efficient spatial fingerprinting localization. © 2011 Praise Worthy Prize S.r.l. - All rights reserved.

关键词： Database systems

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Project Based Learning in computer science – A Review of More than 500 Projects

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Procedia - Social and Behavioral sciences 2011年 29卷 1561-1566页

作者： Robert Pucher Martin Lehner Department of Computer Science University of Applied Sciences – Technikum WienHoechstaedtplatz 5 1200 Vienna Austria Department of Social Competence & Management Methods University of Applied Sciences – Technikum WienHoechstaedtplatz 5 1200 Vienna Austria

Project Based Learning (PjBL) has become a widely used method of teaching in technical subjects. In the last ten years our experiences with PjPL reveal a very complex picture. On the one hand PPL does have benefits, on the other hand the handling of numerous projects is complex and the evaluation of the results difficult to standardize. teaching with projects quite often turned out to be chaotic in the perception of students. Remarks, based on the results of projects turned out to be highly depended on the subjective point of view of the teacher. Most teachers agree that teaching with PjPL has numerous advantages especially in the field of computer science. Students are able to apply their technical knowledge, acquire practical skills in programming, get involved into team processes and understand in some cases even so called soft factors in project management. However IT projects in teaching environments behave very oddly when one tries apply standardized frameworks onto them. After more than ten years of routinely use of PjPL in computer science the authors try to identify critical success factors for such projects. Four main reasons could be identified: 1. Students are no experienced project managers and frequently run into problems in early phases of the projects. 2. The motivation of students to actually finish the project varies between low and extremely high values. 3. Interactions of teachers with students, dependent on factors like specific experience of a given teacher with a specific project or students who are shy to ask seemingly stupid questions very early. 4. Origin of the project or project idea.

关键词： Project Based Learning computer science Motivation

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Deciding to major in computer science: A grounded theory of students' self-assessment of ability 11

Deciding to major in computer science: A grounded theory of ...

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7th International Computing Education Research Workshop, ICER 2011

作者： Lewis, Colleen M. Yasuhara, Ken Anderson, Ruth E. Graduate School of Education University of California Berkeley Berkeley CA 94720 United States Center for Engineering Learning and Teaching University of Washington Seattle Seattle WA 98195-2183 United States Department of Computer Science and Engineering University of Washington Seattle Seattle WA 98195-2350 United States

ISBN: (纸本)9781450308298

There is great interest in understanding and influencing students' attraction to computing-related majors. This qualitative study is based on interviews with 31 students enrolled in introductory programming courses at two public universities in the United States. This paper presents a model of five factors that influence student decisions to major in CS and elaborates on our grounded theory analysis of one of these factors: how students assess their CS-related ability. We describe how students measure their ability in terms of speed, grades, and previous experience and how students make interpretations and decisions based upon these measurements. We found that students' interpretations were influenced by experiences in their environments and beliefs about ability as being fixed or malleable. © 2011 ACM.

关键词： Students

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EFW: A cross-layer metric for reliable routing in wireless mesh networks with selfish participants

EFW: A cross-layer metric for reliable routing in wireless m...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： Stefano Paris Cristina Nita-Rotaru Fabio Martignon Antonio Capone Dipartimento di Elettronica e Informazione Politecnico di Milano Italy Department of Computer Science Purdue University USA Department of Information Technology and Mathematics Methods University of Bergamo Italy

Wireless mesh networks (WMNs) have emerged as a flexible and low-cost network infrastructure, where heterogeneous mesh routers managed by different users collaborate to extend network coverage. Several routing protocols have been proposed to improve the packet delivery rate based on enhanced metrics that capture the wireless link quality. However, these metrics do not take into account that some participants can exhibit selfish behavior by selectively dropping packets sent by other mesh routers in order to prioritize their own traffic and increase their network utilization. This paper proposes a novel routing metric to cope with the problem of selfish behavior (i.e., packet dropping) of mesh routers in a WMN. Our solution combines, in a cross-layer fashion, routing-layer observations of forwarding behavior with MAC-layer measurements of wireless link quality to select the most reliable and high-performance path. We integrated the proposed metric with a well-known routing protocol for wireless mesh networks, OLSR, and evaluated it using the NS2 simulator. The results show that our cross-layer metric accurately captures the path reliability, even when a high percentage of network nodes misbehave, thus considerably increasing the WMN performance.

关键词： Measurement Network topology Wireless communication Topology Routing Routing protocols Ad hoc networks

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Efficient routing strategies in scale-free networks with limited bandwidth

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Physical Review E 2011年第2期84卷 026116-026116页

作者： Ming Tang Tao Zhou Web Sciences Center University of Electronic Science and Technology of China Chengdu 610054 People’s Republic of China Computer Experimental Teaching Center University of Electronic Science and Technology of China Chengdu 610054 People’s Republic of China Department of Modern Physics University of Science and Technology of China Hefei 230026 People’s Republic of China

We study the traffic dynamics in complex networks where each link is assigned a limited and identical bandwidth. Although the first-in–first-out (FIFO) queuing rule is widely applied in the routing protocol of information packets, here we argue that if we drop this rule, the overall throughput of the network can be remarkably enhanced. We propose some efficient routing strategies that do not strictly obey the FIFO rule. Compared to the routine shortest-path strategy, throughput for both Barabási-Albert (BA) networks and the Internet can be improved by a factor of more than five. We calculate the theoretical limitation of the throughput. In BA networks, our proposed strategy can achieve 88% of the theoretical optimum, yet for the Internet, it is about 12%, implying that we still have a huge space to further improve the routing strategy for the Internet. Finally, we discuss possibly promising ways to design more efficient routing strategies for the Internet.

关键词： Throughput

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New sensitivity normalization in electrical tomography

New sensitivity normalization in electrical tomography

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2nd Annual Conference on Electrical and Control Engineering, ICECE 2011

作者： Wang, Zhanjun Li, Liu Department of Computer and Mathematics Teaching Shenyang Normal University Shenyang Liaoning China College of Physics Science and Technology Shenyang Normal University Shenyang Liaoning China

ISBN: (纸本)9781424481637

Due to the shortcoming of linear normalization for sensitivity in electrical tomography system, nonlinear formulas are derived about electrical resistance tomography (ERT), capacitance tomography (ECT) and electromagnetic tomography (EMT). Those formulas are deduced according to the characteristics of analytical solution and system structure. The role of normalization in data processing is introduced. Logarithmic normalization formula is summarized for ERT. In ECT, parallel model and serial model are introduced, and nonlinear formulas are described depending on real distribution in object field. Mainly, special normalization formula is deduced. © 2011 IEEE.

关键词： Data handling

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New sensitivity normalization in electrical tomography

New sensitivity normalization in electrical tomography

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International Conference on Electrical and Control Engineering (ICECE)

作者： Zhanjun Wang Liu Li Department of Computer and Mathematics Teaching Shenyang Normal University Shenyang Liaoning China College of Physics Science and Technology Shenyang Normal University Shenyang Liaoning China

关键词： Sensitivity Educational institutions Capacitance Instruments Electrical capacitance tomography

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