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System identification of magneto-rheological damper using group method of data handling (GMDH)

System identification of magneto-rheological damper using gr...

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2009 6th International Symposium on Mechatronics and its Applications, ISMA 2009

作者： Assaleh, Khaled Shanableh, Tamer Kheil, Yasmeen Abu Department of Electrical Engineering American University of Sharjah United Arab Emirates Department of Computer Science and Engineering American University of Sharjah United Arab Emirates Mechatronics Graduate Program American University of Sharjah United Arab Emirates

ISBN: (纸本)9781424434817

In this paper Group Method of Data Handling (GMDH) technique is implemented and applied to the system identification problem of a Magneto-Rheological (MR) damper. GMDH networks are used to approximate the forward and inverse dynamic behaviors of a MR damper. The difficulty of this identification problem stems from the inherent hysteretic and highly nonlinear dynamics of MR dampers. The GMDH-based solution exhibits comparable identification accuracy in both the forward and inverse models as compared to state-of-the-art more computationally extensive solutions. © 2009 IEEE.

关键词： Inverse problems

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An agent framework to support sensor networks' setup and adaptation

An agent framework to support sensor networks' setup and ada...

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International Multiconference on computer Science and Information Technology, IMCSIT '09

作者： De Freitas, Edison Pignaton Heimfarth, Tales Ferreira, Armando Morado Wagner, Flávio Rech Pereira, Carlos Eduardo Larsson, Tony IDE Halmstad University Halmstad Sweden Institute of Informatics UFRGS Porto Alegre Brazil Computer Science Department UFLA Lavras Brazil Defense Engineering Graduate Program Military Institute of Engineering Rio de Janeiro Brazil

ISBN: (纸本)9781424453146

Sensor networks are being used in several emerging applications not even imagined some years ago due to advances in sensing, computing, and communication techniques. However, these advances also pose various challenges that must be faced. One important challenge is related to the autonomous capability needed to setup and adapt the networks, which decentralizes the control of the network, saving communication and energy resources. Middleware technology helps in addressing this kind of problem, but there is still a need for additional solutions, particularly considering dynamic changes in users' requirements and operation conditions. This paper presents an agent-based framework acting as an integral part of a middleware to support autonomous setup and adaptation of sensor networks. It adds interoperability among heterogeneous nodes in the network, by means of autonomous behavior and reasoning. These features also address the needs for system setup and adaptations in the network, reducing the communication overhead and decentralizing the decision making mechanism. Additionally, preliminary results are also presented. © 2009 IEEE.

关键词： Middleware

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Towards an applied multicriteria model to the diagnosis of Alzheimer's disease: A neuroimaging study case

Towards an applied multicriteria model to the diagnosis of A...

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IEEE International Conference on Intelligent Computing and Intelligent Systems (ICIS)

作者： Isabelle Tamanini Ana Karoline de Castro Plácido Rogério Pinheiro Mirian Calíope Dantas Pinheiro University of Fortaleza (UNIFOR) - Graduate Program in Applied Computer Sciences Fortaleza Brazil University of Fortaleza (UNIFOR) - Graduate Program in Applied Computer Sciences Av. Washington Soares 1321 - Bl J Sl 30 - 60.811-905 - Brazil

The Alzheimer's disease has become the most frequent cause of dementia in the last few years, and it is responsible, alone or in association with other diseases, for 50% of the cases in western countries. The main focus of this work is to develop a multicriteria model for aiding in decision making on the diagnosis of Alzheimer's disease by using the Aranau Tool, structured on the Verbal Decision Analysis. In this work, the modeling and evaluation processes were conducted with the aid of a medical expert, bibliographic sources and questionnaires. The questionnaires taken into account were based mainly on patients' neuroimaging tests, and we analyzed wheter or not there were problems in the patients' brain that could be relevant to the diagnosis of Alzheimer's disease.

关键词： Alzheimer's disease Neuroimaging Dementia Testing Batteries Senior citizens Decision making Medical diagnostic imaging Demography Hippocampus

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Design an empathic virtual human to encourage and persuade learners in e-learning systems

Design an empathic virtual human to encourage and persuade l...

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1st ACM International Workshop on Multimedia Technologies for Distance Learning, MTDL 2009, Co-located with the 2009 ACM International Conference on Multimedia, MM'09

作者： Wang, Chin-Yeh Chen, Gwo-Dong Liu, Chen-Chung Liu, Baw-Jhiune Taiwan e-Learning and Digital Archives Program Office National Central University Taiwan Department of Computer Science and Information Engineering National Central University Taiwan Graduate Institute of Network Learning Technology National Central University Taiwan Department of Computer Science and Engineering Yuan-Ze University Taiwan

ISBN: (纸本)9781605587578

Studies indicate that making learners feel good is important only minor to clear knowledge transformation. Many studies have tried to use virtual humans as a part of interface in learning systems to increase the effect of instructions. Based on social interaction and pedagogical theories, many e-learning systems use animated films or virtual reality to boost human-computer engagement and ease their negative emotions. However, affective learning systems still need much research to improve their functionalities and usability. This study proposed a convenient approach to develop an emotionally interactive learning system;learners can express their emotions by mouse-clicking while learning. A virtual human was created to empathically react to learners in proactive and reactive ways to encourage and persuade them into persistent learning and help achieve their goals. Experimental results show that, averagely, subjects can tell virtual human's emotions and agree to its empathic reactions. Persuasion conducted by virtual human could not increase subjects' learning time, but could significantly increase their completion rate of exercises. Copyright 2009 ACM.

关键词： Learning systems

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Policy control management for Web Services

Policy control management for Web Services

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IFIP/IEEE International Symposium on Integrated Network Management

作者： Arlindo L. Marcon Altair O. Santin Luiz A. de Paula Lima Rafael R. Obelheiro Maicon Stihler Graduate Program in Computer Science Pontifical Catholic University of Paraná Brazil Department of Computer Science State University of Santa Catarina Brazil

The decentralization of corporate policy administration aiming to maintain the unified management of user permissions is a hard task. The heterogeneity and complexity of corporate environments burdens the security administrator with writing equally complex policies. This paper proposes an architecture based on Web Services, policy provisioning, and authorization certificates, to build up a loosely coupled unified administrative control for corporate environments. A certificate-based permission management scheme is used to derive new policies in the local domains of each branch. These new policies will update the corporate repository which, in turn, will configure the corresponding policies in the local domains of each branch. The Web Services technology provides the underlying protocols for the development of a prototype which shows the feasibility of our proposal.

关键词： Web services Service oriented architecture Proposals Authorization computer science Permission Prototypes Resource management Access control Information security

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A virtual harp for therapy in an augmented reality environment

A virtual harp for therapy in an augmented reality environme...

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2008 ASME International Design Engineering Technical Conferences and computers and Information in Engineering Conference, DETC 2008

作者： Taylor, Tanasha Palmerius, Karijohan L. Smith, Shana Virtual Reality Applications Center Human Computer Interaction Graduate Program Iowa State University United States NorrkOping Visualization and Interaction Studio LinkOping University Sweden Department of Mechanical Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)9780791843253

The goal of this research study was to develop a music therapy tool using a computer-generated harp which could provide users with visual, audio, and haptic feedback during interaction with the virtual instrument. Realistic 3D visual and haptic feedback was provided through immersion in a portable augmented reality-based system composed of a video see- through head mounted display (HMD) and a Sensable Phantom Omni haptic device. Users play the virtual harp by using the Phantom Omni haptic device to pluck or strum the strings of the harp. Users can also freely move the harp in the augmented reality environment to provide a more realistic experience, similar to that of playing a traditional musical instrument. The system will be used to provide interactive musical experiences and to develop motor skills among individuals with disabilities through music therapy. A virtual therapist feature was developed which can be used by a therapist without musical knowledge to observe a user during therapy exercises or by a user to engage in self-motivated therapy exercises outside the therapy room. With the virtual therapy feature, users can follow a simple pre-determined sequence of notes using color-coded strings. User testing was completed to study usability, therapeutic effectiveness, and patients' therapy motivation. Copyright © 2008 by ASME.

关键词： Virtual reality

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Simulation of Gravity and Flooding Algorithm for Wireless Sensor Network

Simulation of Gravity and Flooding Algorithm for Wireless Se...

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IEEE Malaysia International Conference on Communications

作者： Karyono Ihan Martoyo Henri P. Uranus Junita Byungho Kim Graduate and Undergraduate Program in Electrical Engineering University of Pelita Harapan Dept. of Computer Engineering Kyungsung University

ISBN: (纸本)9781424455317;9781424455324

Wireless Sensor Network (WSN) is a network of sensors that has a very large scale of nodes with a tight resources limitation. WSN is application specific, with a wide range of applications in military, survey, industrial, up to home usage. The major problems for WSN are resource limitations and dynamic network, which require unique algorithms for unique applications. Our study focused on the implementation and the characterization of the Gravity algorithm, with the Flooding algorithm as a comparison. The Gravity algorithm uses the gravity weight which is stored on each node to form a virtual contour. This contour will guide the message to reach the sink. This work is the first implementation of the Gravity model in OMNeT++. Simulations conducted in the full mesh and the layered topology show that the Gravity algorithm uses less energy and a higher diversity factor compared to the Flooding algorithm. A similar result is also acquired when the probability of failures are considered. The result shows that the Gravity algorithm outperforms the Flooding algorithm while still maintaining the simplicity of the algorithm. This is important to a WSN which is resources limited. Only a small amount of memory is needed for the gravity weight calculation and storage.

关键词： Wireless Sensor Network OMNeT++ Flooding Gravity Routing Algorithm Wireless sensor networks Gravity Flood Routing algorithms WSN gene gravity model algorithms diversity factor Custom design simulating

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Encrypted certified trust in multi-agent system

Encrypted certified trust in multi-agent system

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International Conference on computer Supported Cooperative Work in Design

作者： Vanderson Botelho Fabricio Enembreck Braulio C. Avila Hilton de Azevedo Edson E. Scalabrin PPGIA Graduate Program on Applied Computer Science PUCPR-Pontifícia Universidade Católica do Paraná Curitiba Brazil PPGTE Graduate Program on Technology Federal University of Technology-Paraná Curitiba Brazil

ISBN: (纸本)9781424435340

We present a model for the certification of trust in multi-agent systems based on encryption. The objective is to raise the level of efficiency that client agents have when contracting specialized service agents. We make three hypotheses: (i) client agents are able to measure and inform the quality of a service they receive from a service agent; (ii) distributed certificate control is possible because every service agent stores the certificates it receives from its client agents and, (iii) the content of a certificate can be considered safe as long as the public and private keys used to encrypt the certificate remain safe. This approach reduces some weak points of trust models that rely on the direct interaction between service and client agents (direct trust) or those that rely on testimony obtained from client agents (propagated trust). Simulation showed that encrypted certificates of trust improved the efficiency of client agents when choosing their service provider agents. The reason seems to be that the reputation of a given service provider agent is based on the reputation it has among the totality of client agents that used its services.

关键词： Cryptography Multiagent systems Testing Ontologies Open systems Collaborative work computer science Certification Distributed control Context-aware services

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A learning agent to help drive vehicles

A learning agent to help drive vehicles

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International Conference on computer Supported Cooperative Work in Design

作者： Andre Pinz Borges Richardson Ribeiro Braulio C. Avila Fabricio Enembreck Edson E. Scalabrin Graduate Program in Computer Science (PPGla) Pontifical Catholic University of Paraná Brazil Department of Statistics University of Contestado Brazil

ISBN: (纸本)9781424435340

This paper presents the development of an intelligent agent used to assist vehicle drivers. The agent has a set of resources to generate its action policy: road and vehicle features and a knowledge base containing conduct rules. The perception of the agent is ensured by a set of sensors, which provide the agent with data such as speed, position and conditions of the brakes. The main agent behaviour is to carry out action plans involving: increase, maintain or reduce speed. The main effort of this research was the induction of conduct rules from data of previous trips. These rules form a classifier used for the selection of actions forming the conduction plan. Results observed with the experiments have showed that the proposed classifier increases the efficiency throughout the conduction of vehicles.

关键词： Vehicle driving Roads Remotely operated vehicles Vehicle safety Machine learning Data mining Bagging Intelligent agent Navigation Motion control

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An authenticated anonymous group key management with only one rekey message

An authenticated anonymous group key management with only on...

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5th IASTED European Conference on Internet and Multimedia Systems and Applications, EuroIMSA 2009

作者： Wuu, Lih-Chyau Hung, Chi-Hsiang Department of Computer Science and Information Engineering National Yunlin University of Science and Technology 123 University Road Touliu Yunlin Taiwan Graduate School of Engineering Science and Technology Doctoral Program National Yunlin University of Science and Technology 123 University Road Touliu Yunlin Taiwan

ISBN: (纸本)9780889868021

In Internet, IP multicast has been used successfully to provide an efficient, best-effort delivery service for group communication applications. However, applications such as multiparty private conference, distribution of stock market information, pay per view and other subscriber services require secure multicast to protect integrity and confidentiality of the group traffic, and validate group member's authenticity. Providing secure multicast for group communication is problematic without a robust group key management. In this paper, we propose an anonymous group key management with ID-based Signature and secret sharing technologies to distribute a new group key securely to each participant of a group with only one rekey message whenever the group membership changes. The key management guarantees that a legal user, without revealing his/her real identity, can join a group after finishing the mutual authentication with the group initiator, and enforces the forward secrecy and backward secrecy.

关键词： Multicasting

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