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作者： Sato, Asaji Sato, Osamu Takahashi, Nobuya Kono, Michio Dept. of Mechanical Engineering Miyakonojo National College of Technology Miyakonojo 885-8567 Japan Dep. of Computer Science and Systems Engineering Faculty of Engineering University of Miyazaki Miyazaki 889-2192 Japan

ISBN: (纸本)9784990288013

In this paper, equations of motion of a manipulator, whose mechanism has a passive revolute joint, are derived in consideration of characteristics of driving source. Considering the final condition about displacement and velocity, trajectories of velocity for saving energy are calculated by iterative dynamic programming. And, the dynamic characteristics of manipulator controlled based on the trajectory for saving energy are analyzed theoretically. ©ISAROB 2007.

关键词： Dynamic programming

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Discrete methods for association search and status prediction in genotype case-control studies

Discrete methods for association search and status predictio...

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7th IEEE International Conference on Bioinformatics and Bioengineering, BIBE

作者： Brinza, Dumitru Zelikovsky, Alexander Dep. Computer Science and Engineering University of California at San Diego San Diego CA 92093 United States Department of Computer Science Georgia State University Atlanta GA 30303 United States

ISBN: (纸本)1424415098

Recent improvements in high-throughput genotyping technology make possible genome-wide association studies and status prediction (classification) for common complex diseases. This paper addresses three challenges commonly facing such studies: (i) searching an enormous amount of possible gene interactions, (ii) validating reproducibility of associations and (iii) reliably predicting disease status. These challenges have been traditionally addressed in statistics while here we apply computational approaches - optimization and cross-validation. A complex risk factor is modeled as a subset of SNP's with specified alleles and the optimization formulation asks for the one with the maximum odds ratio. When searching for disease associated risk factor, we show that greedy heuristics are much faster and lead to significantly better solutions than exhaustive heuristics in a reasonable amount of time. We propose a novel randomized complimentary greedy search method that is advantageous to the previously best search method. To measure and compare ability of search methods to find reproducible risk factors, we propose to apply a cross-validation scheme usually used for prediction validation. The proposed heuristic association search methods promise better reproducibility than exhaustive searches. We then show that k-fold cross-validation is more reliable than leave-one-out cross-validation for disease status prediction methods since it captures overtraining effect. We have applied known search methods with proposed enhancements as well as status prediction methods (based on these search methods) to real case-control studies for several diseases (Chron's disease, autoimmune disorder, tick-born encephalitis, lung cancer, and rheumatoid arthritis). 2- and 3-fold cross-validations show that the new methods find strongly associated risk factors and reliably predict disease status for considered case-control studies. ©2007 IEEE.

关键词： Genes

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An integrative approach for teaching/tutoring process models using meta-models

An integrative approach for teaching/tutoring process models...

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IADIS International Conference on Cognition and Exploratory Learning in Digital Age, CELDA 2007

作者： Martens, Alke Harrer, Andreas University of Rostock Dep. of Computer Science and Electrical Engineering Albert-Einstein-Str. 21 D-18059 Rostock Germany University of Eichstätt Dep. of Mathematics and Geography Ostenstr. 14 D-85072 Eichstätt Germany

ISBN: (纸本)9781627483322

This paper discusses different formal models to represent educational processes and their use by computer systems. Currently most of these models are tied to specific application scenarios and tools, which reduces the transferability and re-usability of these models in different contexts. To achieve the interoperable use and transfer between different educational systems we propose the meta-modeling approach GOLEM (Graphically Organized Learning and Educational Metamodel) using an intermediary visual language the different models are mapped to. We describe the different mappings and discuss potential and limitations of the transformations.

关键词： Visual languages

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Agent-based distributed group key establishment in wireless sensor networks

Agent-based distributed group key establishment in wireless ...

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2007 IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, WOWMOM

作者： Chatzigiannakis, Ioannis Konstantinou, Elisavet Liagkou, Vasiliki Spirakis, Paul Computer Technology Institute P.O. Box 1122 26110 Patras Greece Department of Computer Engineering and Informatics University of Patras 26500 Patras Greece Dep. of Information and Communication Systems Engineering University of the Aegean 83200 Samos Greece

ISBN: (纸本)1424409926

Wireless sensor networks are comprised of a vast number of ultra-small autonomous computing, communication and sensing devices, with restricted energy and computing capabilities, that co-operate to accomplish a large sensing task. Such networks can be very useful in practice, e.g. in the local monitoring of ambient conditions and reporting them to a control center. In this paper we propose a distributed group key establishment protocol that uses mobile agents (software) and is particularly suitable for energy constrained, dynamically evolving ad-hoc networks. Our approach totally avoids the construction and the maintenance of a distributed structure that reflects the topology of the network. Moreover, it trades-off complex message exchanges by performing some amount of additional local computations in order to be applicable at dense and dynamic sensor networks. The extra computations are simple for the devices to implement and are evenly distributed across the participants of the network leading to good energy balance. We evaluate the performance of our protocol in a simulated environment and compare our results with existing group key establishment protocols. The security of the protocol is based on the Diffie-Hellman problem and we used in our experiments its elliptic curve analog. Our findings basically indicate the feasibility of implementing our protocol in real sensor network devices and highlight the advantages and disadvantages of each approach given the available technology and the corresponding efficiency (energy, time) criteria. ©2007 IEEE.

关键词： Wireless sensor networks

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Refinement of a tool to assess the data quality in Web portals

Refinement of a tool to assess the data quality in Web porta...

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7th International Conference on Quality Software, QSIC 2007

作者： Caro, Angélica Calero, Coral De Salamanca, Juan Enriquez Piattini, Mario Department of Computer Science and Information Technologies University of Bio Bio Chillán Chile Information Systems and Technologies Dep. UCLM-INDRA Research and Development Institute University of Castilla-La Mancha Spain

ISBN: (纸本)0769530354

The Internet is now firmly established as an environment for the administration, exchange and publication of data. To support this, a great variety of Web applications have appeared, among these web portals. Numerous users worldwide make use of Web portals to obtain information for different purposes. These users, or data consumers, need to ensure that this information is suitable for the use to which they wish to put it. PDQM (Portal Data Quality Model) is a model for the assessment of portal data quality. It has been implemented in the PoDQA tool (Portal Data Quality Assessment tool), which can be accessed at http://***. In this paper we present the various refinements that it has been necessary to make in order to obtain a tool which is stable and able to make accurate and efficient calculations of the elements needed to assess the quality of the data of a web portal. ©2007 IEEE.

关键词： Portals

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StorySurfer: A playful book browsing installation for children's libraries 07

StorySurfer: A playful book browsing installation for childr...

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6th international Conference on Interaction Design And Children, IDC 2007

作者： Eriksson, Eva Lykke-Olesen, Andreas IDC - Interaction Design Collegium Dep. of Computer Science and Engineering Chalmers University of Technology SE-41296 Gothenburg Sweden Department of Design Aarhus School of Architecture DK-8000 Aarhus C Denmark

ISBN: (纸本)9781595937476

In this paper, we present a large-scale interactive book browsing installation for children's libraries called StorySurfer. The StorySurfer prototype is developed within the Interactive Children's Library project, which includes interests from within design, research, industry, and libraries. The objective of the project is to give room for and encourage the physical activities of children, while pursuing to connect these with the basic digital and analogue services of the library e.g. borrowing and handing in books, searching for information, and providing access to a rich variety of media. Copyright 2007 ACM.

关键词： Digital libraries

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Implementation and evaluation of EduBingo for arithmetic drill

Implementation and evaluation of EduBingo for arithmetic dri...

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DIGITEL 2007: 1st IEEE International Workshop on Digital Game and Intelligent Toy Enhanced Learning

作者： Chang, Sung-Bin Deng, Yi-Chan Cheng, Hercy N. H. Liao, Hui-Chun Yu, Fu-N Chan, Tak-Wai Dep. of Computer Science and Information Engineering National Central University Taiwan Institute of Education National Cheng Kung University Taiwan Graduate Institute of Network Learning Technology National Central University Taiwan

ISBN: (纸本)0769528015

Bingo is a universally known, popular, and easy-toplay game. Following Bingo rules with some modifications, we have designed and implemented a game, called EduBingo, for practicing mathematics fractions. The game was implemented and experimented in a 'one-to-one' technology enhanced classroom, where every student learns with a wireless enabled computing device. The experiment investigated students' preferences, system usability, as well as the effects on their affective states of a grade 4 class with 22 students. The result of the questionnaire indicates that the usability of EduBingo is acceptable and there was increase of various affective levels of the students. The data collected by the system, after analysis, implies that, for most students, accuracy and efficiency of solving fraction questions increased. The preliminary result also suggests some directions for further research. © 2007 IEEE.

关键词： Digital arithmetic

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A Generic Multi-Robot Coordination Strategic Layer 1

A Generic Multi-Robot Coordination Strategic Layer

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1st International Conference on Robot Communication and Coordination, RoboComm 2007

作者： Certo, João Lau, Nuno Reis, Luis P. IEETA Institute of Electronics and Telematics Engineering of Aveiro Portugal FEUP Faculty of Engineering The University of Porto Portugal DETI –Informatics Electronics and Telecommunications Dep. University of Aveiro Portugal LIACC – Artificial Intelligence and Computer Science Lab. Univ. Porto Portugal

ISBN: (纸本)9789639799080

Managing a team of heterogeneous robots in a dynamic environment poses a challenging job. In this paper a model for a multi-purpose, real-time, adaptable, strategical coordination layer is presented. Based on previous work developed for the RoboCup Soccer simulation, small-size, middle-size and legged leagues, a generic coordination model was built. As both centralized and distributed environment are handled by the layer, communication was an important factor to consider only introducing a minor overhead. A multi-level hierarchical approach was followed with hybrid methods used to switch between concepts. The model was tested with two strategy instances, RoboCup Rescue Simulation and RoboCup Soccer. Strategies are designed with the help of a graphical tool. Results achieved by the team in RoboCup Rescue and Soccer Simulation competitions demonstrate the usefulness of this approach. Copyright © 2011-2012 ICST

关键词： Sports

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Estimation of time-varying cortical connectivity during the intention of movement in spinal cord injured patients

Estimation of time-varying cortical connectivity during the ...

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2007 Joint Meeting of the 6th International Symposium on Noninvasive Functional Source Imaging of the Brain and Heart and the International Conference on Functional Biomedical Imaging, NFSI and ICFBI 2007

作者： Astolfi, L. Mattia, D. Cincotti, F. De Vico Fallani, F. Tocci, A. Colosimo, A. Salinari, S. Marciani, M.G. Gao, S. Witte, H. Babiloni, F. Dep. of Human Physiology and Pharmacology Univ. of Rome La Sapienza IRCCS Fondazione Santa Lucia Rome Italy Fondazione Santa Lucia Rome Italy Centro di Ricerca de La Sapienza l'Analisi dei Modelli Informazione Nei Sistemi Biomedici Rome Italy Dep. of Computer Science Univ. of Rome La Sapienza Dep. of Neuroscience University of Tor Vergata and Fondazione Santa Lucia Rome Italy Department of Biomedical Engineering Tsinghua University Beijng China Institute of Medical Statistics Computer Sciences and Documentation Friedrich Schiller University of Jena Germany

ISBN: (纸本)1424409489

In this paper we propose the use of a time-varying multivariate estimator based on the Partial Directed Coherence (PDC), a frequency-domain estimator able to describe interactions between cortical areas in terms of the concept of Granger causality. Time-varying PDC was obtained by the adaptive recursive fit of an MVAR model with time-dep.ndent parameters, by means of a generalized recursive least-square (RLS) algorithm, taking into consideration a set of EEG epochs. Such estimator is able to follow rapid changes in the connectivity between cortical areas during an experimental task. We provide an application to the cortical estimations obtained from high resolution EEG data, recorded from a group of healthy subject during a combined foot-lips movement, and from a patient with Spinal Cord Injury during the attempt to move the paralysed limb. Normal subjects and the SCI patient exhibit similar cortical networks, although certain differences between the time evolution of connectivity strengths between the primary foot and lips areas arose. © 2007 IEEE.

关键词： Frequency domain analysis

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Sending the most appropriate feedbacks to students

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WSEAS Transactions on Information science and Applications 2007年第3期4卷 584-591页

作者： Kuo, Rita Hsieh, Athena Chang, Maiga Heh, Jia-Sheng Department of Electronic Engineering Chung-Yuan Christian University No.200 Chung Pei Rd. Chung Li 32023 Taiwan Dep. of Information and Computer Engineering Chung-Yuan Christian University No.200 Chung Pei Rd. Chung Li 32023 Taiwan National Science and Technology Program for e-Learning in Taiwan No.300 Jungda-Rd. Chung-Li 32001 Taiwan

It is important for students getting suitable feedback information when either they are doing or completing a learning activity. This research tries to know what kind of feedback message is really useful to students. For this purpose, this paper develops a workable e-learning environment with feedback mechanism to gather the learning effects of students with different kinds of feedbacks. The experiment involves five fifth-grade classes and divides five classes into three different groups. The students in the control group have no feedback and students in the other two groups have different kinds of feedback messages. The analysis of experiment data contains two parts: the first one evaluates the feedback efficiencies for all groups;and, then all students will be separated into three clusters based on their academic achievement in order to do further analysis.

关键词： Feedback

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