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Usability evaluation of three unilateral - Propelled wheelchairs for hemiplegic patients

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作者： Tsai, Kueng Horng Yeh, C.Y. Lo, H.C. Chang, L.T. Lee, J.S. Lee, C.T. Graduate Institute of System Engineering National University of Tainan Taiwan School of Physical Therapy Chung Shan Medical University Taiwan Institute of Biomedical Engineering National Cheng Kung University Taiwan Department of Childhood Education and Nursery Chia Nan University of Pharmacy and Science Tainan Taiwan Department of Computer Science and Information Engineering National University of Tainan Taiwan

ISBN: (纸本)9783540693666

Most hemiplegic patients use the unaffected arm and leg to propel wheelchair. The asymmetrical forces may cause the wheelchair to stray toward the affected side on level surface, and even cause danger on a slope. Although a variety of designs from mechanical approach have been developed to improve propulsion efficiency and reduce injuries, such as hand-lever drive and crank propulsion, most of them were just designed for users having healthy upper limbs. The purpose of this study was to evaluate the usability and the physiological responses of each of the two new wheelchairs comparing with a commercial two-handrim propelled wheelchair at a rehabilitation center. Two newly designed wheelchairs (ankle-propelled wheelchair (APW), knee-propelled wheelchair (KPW)) were recruited and compared with a commercial two-handrim propelled wheelchair (TPW). 15 stroke patients were recruited from the rehabilitation center of Chung Shan Medical University, Taichung, Taiwan. Subjects propelled the three wheelchairs along an oval-shaped pathway and videotape was made during test for analysis. The parameters, including total propelling time, deviation frequencies, deviation percentage, physiological cost index (PCI), maximum VO2 (VO2max), and rating of perceived exertion (RPE) were measured and compared among the three types of wheelchair. The results show that KPW had the best results in terms of performance evaluation among the three wheelchairs no matter in controllability, cardiopulmonary responses, or RPE. However, the gear ratio of force transmitting system of KPW was fixed, and some patients felt that the propulsion was heavy when starting KPW. It was more suitable and comfortable for hemiplegic patients to use KPW than to propel TPW and APW. If the adjustment of KPW were properly improved, it would be a comfortable device for movement for hemiplegic patients. © 2008 Springer-Verlag.

关键词： Wheelchairs

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A Reference Monitor Model for Improving User Comfort and Privacy of Home Gateway in OSGi Service Platform

A Reference Monitor Model for Improving User Comfort and Pri...

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IEEE International Conference on Consumer Electronics (ICCE)

作者： Eun-Ae Cho Chang-Joo Moon Doo-Kwon Baik Department of Computer Science & Engineering Korea University Seoul South Korea Department of Aerospace Information System Engineering Konkuk University Seoul South Korea

In home network environments, user comfort, and privacy are very important issues that need to be addressed. The reference monitor is the collection of access controls for devices, files, memory, and other kinds of objects and it is also able to provide advanced facilities for access control. In order to meet the user's requirements for comfortability and privacy, a reference monitor model is proposed for improving the home gateway in the OSGi service platform. The proposed model is based on the RBAC model, and the policy is classified into two types: user-role assignment policy and permission-role assignment policy. The policies are in XML format. With the use of the proposed reference monitor model, more effective guidelines can be provided for user access control in home networks.

关键词： Privacy Home automation Access control Authorization XML Information security computerized monitoring Home appliances computer science Aerospace engineering

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Using adaptive agent-based approach to iterative distributed swapping prediction for interference reduction in cellular systems

Using adaptive agent-based approach to iterative distributed...

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International Symposium on Performance Evaluation of computer & Telecommunication systems SPECTS

作者： Jamal Raiyn Avraham Freedmann Helena Szczerbicka Department of Computer Science Alqasemi College for Education Baka Al-Gharbia Israel Hexagon System Engineering Petach Tikva Israel Institute for System Engineering University of Hannover Germany

ISBN: (纸本)9781424434497

In todaypsilas high density wireless networks, interference is considered one of the main factors limiting the capacity and increasing the new call blocking probability of a cellular system. In this paper we discuss and analyze interference scenarios in cellular systems and we propose a novel scheme based on iterative distributed swapping scheme to reduce the interference they experience.

关键词： Iterative methods Interchannel interference Resource management Base stations systems engineering and theory Telecommunication traffic Radio transmitters Power system modeling Working environment noise Land mobile radio cellular systems

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An Approach to Privacy Enhancement for Access Control Model in Web 3.0

An Approach to Privacy Enhancement for Access Control Model ...

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International Conference on Convergence Information Technology

作者： Eun-Ae Cho Chang-Joo Moon Dae-Ha Park Doo-Kwon Baik Department of Computer Science & Engineering Korea University Seoul South Korea Department of Aerospace Information System Engineering Konkuk University Seoul South Korea Department of Computer and Information Science Korea Digital University Seoul South Korea

The recent Web technology has been developed by three mainsprings which include integration, virtualization, and socialization. The Web technology provides the increment of the social networking ability. However it deepens the exposure of privacy about personal information as more complicating and difficult problems. Representatively, it is impossible to define and manage the specific relation, so the personal information and interest can be inferred from collecting and summarizing the contents. Also, there are some problems that it is hard to construct the information owner's own social network. Thus this paper proposes the new access control model which enhances the user privacy of the existing access control methods in web 2.0. This method prevents privacy such as personal inclination from being exposed and enables to define and manage the specific relation. By doing this the information owners can construct their social network. This social network can be applied and extended to Web contents.

关键词： Privacy Access control Social network services Protection Information services Web sites Internet Content management Service oriented architecture Information technology

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Optimal Dynamic-Priority Real-Time Scheduling Algorithms for Uniform Multiprocessors

Optimal Dynamic-Priority Real-Time Scheduling Algorithms for...

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Real-Time systems Symposium (RTSS)

作者： Shih-Ying Chen Chih-Wen Hsueh Embedded System and Wireless Network Laboratory Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan

In hard-real-time environment, scheduling periodic tasks upon multiprocessors is one of the most popular problems where uniform multiprocessor scheduling is a well-known one. In this platform, execution time of each task in one processor is proportional to the computing capacity of this processor. From previous works, we know there are only approximate feasible solutions for on-line scheduling on uniform multiprocessors. In this paper, with task migration, we first present a novel model called T-Ler plane to describe the behavior of tasks and processors, and two optimal on-line algorithms based on T-Ler plane to schedule real-time tasks with dynamic-priority assignment on uniform multiprocessors. To make it practical and to reduce context switches, we also present a polynomial-time algorithm to bound the times of rescheduling in a T-Ler plane. Since task migration is easier in SOC multicore processors, our result might be applicable and adapted to many asymmetric multicore platforms.

关键词： Scheduling algorithm Processor scheduling Optimal scheduling Job shop scheduling Multicore processing Concurrent computing Real time systems Dynamic scheduling Switches Linux

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Finite element analysis of honeycomb-core foam on shock-absorbing capability against childhood head injury

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作者： Lin, C.Y. Chang, Li-Tung Huang, T.J. Tsai, K.H. Li, C.S. Chang, G.L. Department of Pharmacy Chia Nan University of Pharmacy and Science Tainan Taiwan Department of Childhood Education and Nursery Chia Nan University of Pharmacy and Science 60 Erh-Jen Road Jen Te Tainan Taiwan Department of Mechanical Engineering National Cheng Kung University Tainan Taiwan Graduate Institute of System Engineering National University of Tainan Tainan Taiwan Department of Computer Science and Information Engineering National University of Tainan Tainan Taiwan Institute of Biomedical Engineering National Cheng Kung University Tainan Taiwan

ISBN: (纸本)9783540693666

This study developed a rubber foam model consisting of a surface layer of solid and a base layer of honeycomb core and used it to investigate head injury protective performance. An explicit finite element method based on the experimental data was used to simulate head impact on the rubber foam. The peak acceleration and head injury criterion (HIC) were employed to assess the shock-absorbing capability of the foam. This study supports the feasibility of using rubber foam with honeycomb core construction to improve shockabsorbing capability. The honeycomb-core structure provided an excellent cushioning effect via a lower axial shear stiffness of the surface layer and lower transverse shearing stiffness of the core. The core's dimensions were an important parameter in determining the shearing stiffness. The analysis suggested that the cushioning effect would significantly reduce the peak force on the head from a fall and delay the occurrence of the peak value during impact, resulting in a marked reduction in the peak acceleration and HIC values of the head. © 2008 Springer-Verlag.

关键词： Finite element method

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Attribute clustering with unknown cluster numbers

Attribute clustering with unknown cluster numbers

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IEEE International Conference on systems, Man and Cybernetics

作者： Tzung-Pei Hong Yan-Liang Liou Cho-Han Lee Department of Computer Science and Information Engineering National Information Engineering National University of Kaohsiung Department of Computer Science and Engineering Kaohsiung Taiwan InfoChamp System Corporation Kaohsiung Taiwan Institute of Electrical Engigeering National University of Kaohsiung Kaohsiung Taiwan

In this paper, we try to select features based on attribute clustering without knowing the exact cluster numbers in advance. A similarity measure for a pair of attributes is first described, and an attribute clustering approach based on the CAST algorithm is then proposed to group the attributes into adequate number of clusters. The representative attributes found in the clusters are thus used for classification such that the whole feature space is greatly reduced. If the values of some representative attributes cannot be obtained from current environments for inference, some other possible attributes in the same clusters can also be used to achieve approximate inference results.

关键词： Clustering algorithms Inference algorithms computer science Extraterrestrial measurements Algorithm design and analysis Pattern recognition Machine learning Data mining Filters

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Full-Searching-Equivalent Vector Quantization Method Using Orthogonal Projection

Full-Searching-Equivalent Vector Quantization Method Using O...

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International Symposium on Intelligent Information Technology Application, IITA

作者： Chang-Chu Chen Chin-Chen Chang Department of Computer Science and Information Engineering National Chung Cheng University Taiwan Department of Management Information System Central Taiwan University of Science and Technology Taichung Taiwan Department of Information Engineering and Computer Science Feng Chia University FCU Taichung Taiwan

The encoding process of vector quantization (VQ) is computational complex and time consuming. Compared with traditional Euclidean distance computation, some geometric properties can generate approximations with simpler computation and filter out impossible codevectors to reduce computation time. In this paper, we introduce a new approximation adopting orthogonal projection on a hyperplane for speed-up VQ encoding. Experimental results show that our proposed scheme requires only 2.7~23.2% of actual Euclidean distance calculation in the full searching. Having been proved, our proposed scheme requires only 30.1~40.3% of computation time that other recently proposed schemes need.

关键词： Vector quantization Encoding Decoding Multimedia systems Streaming media Image coding computer science Euclidean distance Table lookup Image retrieval

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Interactive musical editing system to support human errors and offer personal preferences for an automatic piano - Method of searching for similar phrases with DP matching and inferring performance expression

Interactive musical editing system to support human errors a...

引用

作者： Chigoi, Yuichi Hayashi, Eiji Graduate School of Computer Science and System Engineering Kyushu Institute of Technology 680-4 Iizuka City Fukuoka 820-8502 Japan Department of Mechanical Information Science and Technology Kyushu Institute of Technology 680-4 Iizuka City Fukuoka 820-8502 Japan

ISBN: (纸本)9784990288020

We have developed a system that allows a piano to perform automatically. To get the piano to play music in the manner of a live pianist, we must add expression to the piano's performance. In the case of piano music, there are often 1000 or more notes in the score of even a short piece of music, and the automatic editor must spend a huge amount of time to accurately simulate the emotionally expressive performance of a highly skilled pianist. To shorten this editorial time, we have developed an interactive musical editing system to edit music more efficiently by utilizing a database. We have analyzed MIDI data regarding the performances of highly skilled pianists in order to observe the stylistic tendencies of their performances. We found that phrases having similar patterns in the same composition were performed in similar styles. Therefore, we developed a system that searches for similar phrases throughout the musical score and infers the style of their performance. Here, we propose a method using DP (Dynamic Programming) matching as a way to search for similar phrases and a method for inferring performance expression. ©ISAROB 2008.

关键词： Music

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Justification of some field observations of dynamic load behaviors: Analytical and numerical approach

Justification of some field observations of dynamic load beh...

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IEEE General Meeting Power& Energy Society

作者： Byoung-Kon Choi Hsiao-Dong Chiang Stuart T. Cain Department of Electrical Engineering and Computer Science University of Wisconsin Milwaukee WI USA School of Electrical and Computer Engineering Cornell University Ithaca NY USA System Planning Department TN USA

It is known that modeling impedance in distribution networks, including the percentage of induction motor load, is essential to the study of distribution system dynamic responses. In this paper, some field observations of dynamic load behaviors related to distribution network impedance and the percentage of induction motor load are justified using a novel composite load model and output trajectory sensitivity analysis. To provide this justification, we propose a composite load model named Z-ZIP-IM where equivalent distribution network impedance is serially connected to a conventional ZIP-induction motor (ZIP-IM) model. Then parameter values of the proposed composite load model are estimated using actual measurement data from TVA. Finally, output trajectory sensitivity with respect to model parameters at the obtained values is analyzed. In addition, the numerical identifiability of the obtained parameter values is tested.

关键词： Load modeling Numerical models Computational modeling Sensitivity Induction motors Impedance Reactive power

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