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1st Space Exploration Conference: Continuing the Voyage of Discovery

作者： Goforth, Andre Karsai, Gabor Orosz, Michael Neches, Robert Szekely, Pedro Ashish, Naveen NASA Ames Research Center Moffett Field CA 94035-1000 United States Vanderbilt University Institute for Software Integrated Systems Nashville TN 37235 United States University of Southern California Information Sciences Institute Marina del Rey CA 90292 United States USRA Research Institute for Advanced Computer Science NASA Ames Research Center Moffett Field CA 94035 United States Code TC MS269-4 United States Department of Electrical and Computer Engineering Distributed Scalable Systems Division

ISBN: (纸本)1563477270

Program affordability needs to be built-in at the initial concept formulation stage. For NASA's space exploration vision this is critical for long range sustainability of human presence in space. What is often overlooked in the initial concept formulation of a large scale system endeavor such as NASA's Constellation program is the hidden cost of maintaining requisite operational safety margins and redundancy through adequate supply chain logistics. Ensuring adequate supply chain logistics necessitates the integration of operations and maintenance cycles. What enables this integration is the coordination and reconciliation across multiple equipment types of system health features and logistical information such as: (1) prognostic drivers from Integrated Vehicle Health Monitoring (IVHM) systems producing proactive condition-based "maintain me" demands, (2) maintenance management systems tracking usage and producing scheduled maintenance demands, (3) unscheduled maintenance demands resulting from any trouble reports entered by human observers of conditions missed by the IVHM system, and (4) implicit maintenance demands resulting from mission plans which require assignment of vehicular/robotic assets and consequently require assurance of the assigned assets' fitness for the intended tasks. In this paper we discuss how Coordinated Multi-source Maintenance on Demand (CMMD) technology, which is being is transitioned to the USMC Coherent Analytical Computing Environment (CACE) program and the Joint Strike Fighter Program, can be applied to the NASA domain, and its benefits in terms of mission affordability, operations efficiency and system health effectiveness. Using concepts derived from CMMD, we discuss the kind of IVHM capabilities needed to optimize multiple, parallel, yet inter-linked, operations-maintenance cycles, thereby optimizing program affordability while meeting specific mission supportability requirements across a broad range of mission scenarios.

关键词： Space research

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Study of Multi media Streams Dynamic Rate Control Based on Fuzzy Adaptive PID

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The Journal of China Universities of Posts and Telecommunications 2005年第4期12卷 75-79页

作者： SUN Yan-fei ZHANG Shun-yi SHI Jin WANG Jiang-tao Jiangsu Province Engineering Research Center of Telecommunication dr Network Technology Nanjing University of Posts and TelecommunicationsNanjing 210003 P.y. China State Key Laboratory of Novel Software Technology Nanjing University Nanjing 210093 P. R. China Department of Computer Science and Technology Nanjing University of Posts and Telecommunications Nanjing 210003 P. R. China

A Multimedia streams dynamic rate control algorithm based on Fuzzy adaptive PID （MFPID） has been proposed to implement multimedia streams＇ end sending rate on-line self-regulating and smoothing, and to track system resources in time, so that it can avoid system＇s regulating oscillation and guarantee system＇s stability. And, some work has been done to analyze adaptive session model of multimedia streams, to implement future available bandwidth estimation of IP network, to achieve PID parameters＇ on-line self-tuning by fuzzy controlling. Simulation validated the theoretical results of MFPID.

关键词： multimedia transmission dynamic end sending rate PID adaptive regulating fuzzy parameter self-tuning

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Low-level cursive word representation based on geometric decomposition

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4th International Conference on Machine Learning and Data Mining in Pattern Recognition, MLDM 2005

作者： Dong, Jian-Xiong Krzyzak, Adam Suen, Ching Y. Ponson, Dominique IMDS Software 75 rue Queen Montréal Que. H3C 2N6 Canada Center for Pattern-Recognition and Machine Intelligence Concordia University Montréal Que. H3G 1M8 Canada Department of Computer Science and Software Engineering Concordia University 1455 de Maisonneuve Blvd. W. Montréal Que. H3G 1M8 Canada

ISBN: (纸本)3540269231

An efficient low-level word image representation plays a crucial role in general cursive word recognition. This paper proposes a novel representation scheme, where a word image can be represented as two sequences of feature vectors in two independent channels, which are extracted from vertical peak points on the upper external contour and at vertical minima on the lower external contour, respectively. A data-driven method based on support vector machine is applied to prune and group those extreme points. Our experimental results look promising and have indicated the potential of this low-level representation for complete cursive handwriting recognition. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Image analysis

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Testing and Certification of Trustworthy Systems Introduction to Minitrack

Testing and Certification of Trustworthy Systems Introductio...

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Annual Hawaii International Conference on System Sciences (HICSS)

作者： A.R. Hevner R.C. Linger G.H. Walton Information Systems & Decision Sciences Department University of South Florida Tampa FL USA Software Engineering Institute CERT Research Center Carnegie Mellon University Pittsburgh PA USA Department of Mathematics & Computer Science Florida Southern College Lakeland FL USA

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Impacts and cost of faults on services in cellular networks

Impacts and cost of faults on services in cellular networks

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International Conference on Mobile Business (ICMB)

作者： O.P. Kogeda J.I. Agbinya C.W. Omlin Department of Computer Science (Center of Excellence for IP and Internet Computing) University of Western Cape Bellville South Africa Faculty of Engineering (Information & Communication Technology Group) University of Technology Sydney NSW Australia Department of Mathematics and Computing Science University of South Pacific Suva Fiji

In this paper faults are processed and models of faults in telecommunications networks are proposed in relation to services and revenues. The probability of faults occurring is estimated. Cost models are presented predicting the amount of revenue loss. We relate faults to services with detailed relationship between them being shown.

关键词： Costs Intelligent networks Land mobile radio cellular systems

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Learning distributed grasp in presence of redundant agents

Learning distributed grasp in presence of redundant agents

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： A.H. Elahibakhsh M. Nili Ahmadabadi F. Janabi-Sharifi B. Nadjar Araabi AI & Robotics Laboratory Center of Excellence for Control and Intelligent Processing Department of Electrical and Computer Eng. Institute for Studies on Theoretical Physics and Mathematics University of Tehran Tehran Iran Robotics and Manufacturing Automation Lab Department of Mechanical and Industrial Engineering Ryerson University Toronto ONT Canada

Learning distributed object grasp by a group of robots with redundant members is the main focus of this paper. In Elahibakhsh, A. H., et al. (2004), we tackled the problem of learning form closure grasp for planar convex objects by multiple non-communicating robots without any information about the shape of objects. In this paper, the problem in presence of redundant agents is investigated. Agents' states and actions are designed such that the group learns grasping different objects using Q-learning method. As the environment is not intelligent enough to assess each agent's effect on the team performance, a credit assignment algorithm based on knowledge evaluation is designed. The proposed method considers the environment credit for the team, number of redundant agents, and the expertness level of each agent in its credit assignment. Applicability of the designed approach is verified through a set of simulations. It is shown that the team learns grasping different objects. Therefore, it is expected that the proposed method can be extended for distributed grasp of deformable objects

关键词： Intelligent robots Learning Robot sensing systems Shape Cognitive robotics Robotics and automation Intelligent agent Algorithm design and analysis Grasping Redundancy

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Work in progress - spiral curriculum approach to reformulate engineering curriculum

Work in progress - spiral curriculum approach to reformulate...

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Frontiers in Education (FIE) Conference

作者： V.K. Lohani K. Mallikarjunan Wolfe ML T. Wildman J. Connor J. Muffo J. Lo T.W. Knott G.V. Loganathan R. Goff M. Chang J. Cundiff G. Adel F. Agblevor M. Gregg D. Vaughan E. Fox H. Griffin S. Mostaghimi Department of Engineering Education Virginia Polytechnic Institute and State University Blacksburg VA USA Biological Systems Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA Center for Excellence in Undergraduate Teaching Virginia Polytechnic Institute and State University Blacksburg VA USA Academic Assessment Unit Virginia Polytechnic Institute and State University Blacksburg VA USA Civil and Environmental Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA Mining and Minerals Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA Computer Science Virginia Polytechnic Institute and State University Virginia Polytechnic Institute and State University Blacksburg VA USA

A theme-based spiral curriculum approach is being adopted to initiate the department-level reform (DLR) of the freshman engineering and the bioprocess engineering curricula at Virginia Tech. A large number of engineering faculty members are collaborating with experts in educational psychology and academic assessment to accomplish the objectives of this 3-year NSF supported project that began in September 2004. Successful implementation of the spiral approach will be used as a model for incorporating similar reforms in other engineering departments and elsewhere

关键词： Spirals Collaboration engineering education Psychology Biological systems Systems engineering and theory Educational programs Minerals computer science Systems engineering education

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A hybrid method for real-time animation of trees swaying in wind fields

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VISUAL computer 2004年第10期20卷 613-623页

作者： Ota, S Tamura, M Fujimoto, T Muraoka, K Chiba, N Iwate Software Center Japan Department of Computer and Information Sciences Faculty of Engineering Iwate University Japan Department of Communications Engineering Tohoku Institute of Technology Japan

Trees are one of the most important elements of natural landscapes. Therefore, in computer graphics, there is a great demand for methods to realize the natural representation of trees in virtual landscapes in various fields such as the entertainment industry or environmental assessment in construction. Many studies have been made on techniques in which the shapes of trees are modeled but only a few studies have been reported on methods to incorporate the shapes with motions in a wind field. Most of these studies use physical simulation techniques based on the equations of motion to generate the branch motions and cannot realize the motions of individual leaves. In this paper, we propose a method to create the natural motions of individual leaves and branches swaying in a wind field. The proposed method uses a hybrid approach combining a stochastic method and a simulation method. The stochastic method is based on 1/f(beta) stop noise, which is observed in various natural phenomena, and provides natural motion to leaves and branches. In addition, a simple simulation method based on the spring model is applied to branches to enhance the reality of their motions. This method enables the real-time creation of the leaf and branch motions. Diverse motions according to tree species and shapes and wind conditions can be easily realized by controlling the parameters.

关键词： tree motion wind 1/f(beta) noise real-time animation

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Priority assessment of software requirements from multiple perspectives

Priority assessment of software requirements from multiple p...

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Proceedings of the 28th Annual International computer software and Applications Conference, COMPSAC 2004

作者： Liu, Xiaoqing Veera, Chandra Sekhar Sun, Yan Noguchi, Kunio Kyoya, Yuji University of Missouri Computer Science Department Rolla Software Engineering Center Toshiba Corporation Japan

The development of complex software systems involves collecting software requirements from various stakeholders. Often stakeholder perceptions conflict during the requirements elicitation phase. An effective technique for to resolve such a conflict is needed. In this paper, we presented a framework that prioritizes software requirements gathered from multiple stakeholders by incorporating interperspective relationships, which is not addressed by existing priority assessment techniques. We use a relationship matrix to analyze the impact between requirements and facilitate the integration process which assesses their priorities based on their relationships from multiple perspectives. It allows the development team to resolve conflicts effectively and concentrate their valuable time and resources on the critical few requirements from multiple perspectives that directly contribute to high customer satisfaction. © 2004 IEEE.

关键词： Requirements engineering

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Improvement of low frequency oscillation damping in power systems via an adaptive critic based neurofuzzy controller 8th

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8th International Conference on Knowledge-Based Intelligent Information and engineering Systems, KES 2004

作者： Rashidi, Farzan Moshiri, Behzad Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Iran

ISBN: (纸本)9783540232056

This paper proposes an Adaptive Critic Based Neuro-Fuzzy Controller (ACBNFC) to Thyristor Controlled Series Capacitor (TCSC), which might have a significant impact on power system dynamics. The function of the ACBNFC is to control a firing angle of the TCSC. The proposed method is used for damping the low frequency oscillations caused by disturbances such as a sudden change of small or large loads or an outage in the generators or transmission lines. To evaluate the usefulness of the proposed method, the computer simulation for single machine infinite system is performed and compared with fuzzy PD controller. Obtained results show the proposed control strategy is very robust, flexible and could be used to get the desired performance levels. The response time is also very fast. Simulation results that have been compared with fuzzy PD controller show that our method has the better control performance than fuzzy PD controller. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Damping

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