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AIAA/ASME/SAE/ASEE 42nd Joint Propulsion Conference

作者： Figueroa, Fernando Holland, Randy Schmalzel, John Duncavage, Dan Crocker, Alan Alena, Rick NASA Stennis Space Center Stennis Space Center MS 39529 Rowan University Dept. of Electrical and Computer Engineering Glassboro NJ 08028 NASA Johnson Space Center Houston TX 77058 NASA Ames Research Center Moffett Field CA 94035 Science and Technology Division EA41 Stennis Space Center MS 39529 AIAA Department of Electrical and Computer Engineering Rowan University Glassboro NJ 08028 International Space Station Program OD NASA Johnson Space Center Houston TX 77058 Systems Division Mission Operations Directorate DF NASA Johnson Space Center Houston TX 77058 Intelligent Systems Division MS 269-4 Moffett Field CA 94035

ISBN: (纸本)1563478188

This paper addresses methodic implementation of a credible ISHM capability for elements of Constellation systems. ISHM capability must be implemented by a combination of on-board and ground elements, each contributing to determining the health of systems in the most effective manner. Implementation of ISHM capability must evolve continuously to reach higher and higher levels of functional capability. The implication is that a sustainable approach must be defined in order to accomplish a believable capability. This paper describes the methodology, the elements, and the technology to implement ISHM capability throughout the life cycle of elements of Constellation systems, reaching beyond individual elements that might have a limited life while the constellation moves on.

关键词： Spacecraft propulsion

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Real-time organ motion tracking and fast image registration system for MRI-guided surgery

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systems and computers in Japan 2006年第1期37卷 83-92页

作者： Tokuda, Junichi Hirano, Masaya Tsukamoto, Tetsuji Dohi, Takeyoshi Hata, Nobuhiko Graduate School of Information Science and Technology University of Tokyo Tokyo 113-8656 Japan GE Yokogawa Medical Systems Ltd. Hino 191-8503 Japan International Society for Computer-Aided Surgery Japan Society for Computer-Aided Surgery Japan Society for Magnetic Resonance in Medicine GE Yokogawa Medical Systems Ltd. Imaging Application Tech. Center MR Group R and D Laboratory Technology Center GE Yokogawa Medical Systems Ltd. Society for Magnetic Resonance in Medicine Graduate School of Information Science and Technology Society for Life Support Technology Japan Society for Organ Preservation Biology and Medicine Society for Precision Engineering Society for Medical Image Computing and Computer Assisted Intervention International Union for Physics and Engineering Sciences in Medicine JSMEBE Japan Society for Life Assistance Technology Brigham and Women's Hospital Harvard Medical School MR Therapy Program

The advantage of magnetic resonance imaging (MRI)-guided surgery, in which MR images taken during surgery are used to guide the surgery, has been recognized recently. However, there is a problem, due to long imaging time of MRI, that it is difficult to capture the respiratory organ motion. It is often a constraint that the patient must hold his or her breath, especially in the treatment of the abdominal region. Consequently, this paper proposes a method of eliminating this constraint in MRI-guided surgery by real-time monitoring of the movement of the organ involved in the surgery by means of the signal derived from MRI. Specifically, the navigator echo is extracted in imaging during surgery. The movement of the organ involved in surgery is detected on the basis of the change in the calculated projection profile, and the results are presented to the surgeon. In this study, the procedure is built into a 1.5-T clinical MRI system. The feasibility of the proposed system was examined under clinical conditions by evaluating its accuracy and delay in a phantom experiment, and also in an in vivo experiment on the liver of a volunteer. The results are reported in this paper. © 2005 Wiley Periodicals, Inc.

关键词： Motion estimation

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Chitosan for Biofunctionalization of Microsystems

Chitosan for Biofunctionalization of Microsystems

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IEEE/NLM Life science systems and Applications Workshop

作者： Stephan T. Koev Michael A. Powers Vlad Badilita Hyunmin Yi William E. Bentley Gregory F. Payne Gary W. Rubloff Reza Ghodssi Institute for Systems Research ISR University of Maryland College Park MD USA University System of Maryland Adelphi MD US Department of Materials Science and Engineering University of Maryland College Park MD USA Department of Chemical Engineering University of Maryland College Park MD 20742 University of Maryland Biotechnology Institute (UMBI) University of Maryland College Park MD 20742 Bioengineering Graduate Program University of Maryland College Park MD 20742 University of Maryland College Park MD USA University of Maryland Biotechnology Institute College Park MD USA Institute for Systems Research (ISR) University of Maryland College Park MD 20742 Department of Materials Science and Engineering University of Maryland College Park MD 20742 Department of Electrical and Computer Engineering University of Maryland College Park MD 20742 Institute for Systems Research (ISR) University of Maryland College Park MD 20742

ISBN: (纸本)1424402778

We present the use of the polysaccharide chitosan for immobilizing biomolecules on microfabricated device surfaces. The main advantages of chitosan are its abundance of primary amine groups and its ability to be electrodeposited. Biomolecules are easily attached to chitosan 's amines by standard glutaraldehyde chemistry. The electrodeposition of chitosan allows accurate spatial and temporal control of biomolecule placement. We have demonstrated this biofunctionalization method for two different bioMEMS devices: a biophotonic sensor and a micromechanical biosensor. We have successfully assembled probe DNA on each of them and detected hybridization with target DNA as a demonstration of sensor operation. Here, we briefly present the fabrication procedure and testing results for both of these bioMEMS sensing devices

关键词： DNA Biosensors Molecular biophysics Probes Micromechanical devices Optical sensors Optical surface waves Optical interferometry Assembly Biomedical optical imaging

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Data Storage Media Sanitization Procedures at the U.S. Agency For International Development (USAID)

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EDPACS 2006年第8期29卷 11-19页

作者： James Craft William Cleveland The Information Systems Security Officer at the United States Agency for International Development (USAID) Bureau for Management Information Resources Management (M/IRM) Information Systems Security Team. He has a BS in business management from George Mason University and has 22 years of experience focusing primarily on systems engineering cybersecurity and enterprise operations. He has played a major role in the implementation of the U.S. Government's Model Information Security Policy. The USAID PRIME Security Program Manager Computer Sciences Corporation in Arlington Virginia. He has MS degrees in information and telecommunications systems management and in military science. Cleveland has over 20 years of experience in the planning and management of a wide variety of functions including business process reengineering and IT security.

This article is derived from a Best Security Practice (BSP) developed by the U.S. Agency for International Development (USAID), Bureau for Management, Information Resources Management (M/IRM), Information systems Security Team. The USAID is an independent agency that provides economic, development, and humanitarian assistance around the world in support of the foreign policy goals of the United States. It is located in the Ronald Reagan Building in Washington, D.C.

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Meeting the Information Assurance Crisis in the U.S. Now

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EDPACS 2006年第6期28卷 1-14页

作者： Corey Schou Deborah Frincke Charles Reynolds James Frost The Associate Dean of Information Systems Programs at Idaho State University (ISU) in Pocatello and the director of the Center for Decision Support. Currently he serves as the Chair of the National Colloquium on Information System Security Education. Schou also directs the ISU National Center of Excellence in Information Assurance Education and the ISU Technology Innovation Center. Contact Corey Schou one of the authors of this article and the Chair of the NCISSE by email at Schou@*** for help in finding additional ways to address the issues raised in this article. A member of the University of Idaho College of Engineering faculty. She graduated from the University of California at Davis. Frincke is the co-director and co-founder of the university's Center for Secure and Dependable Software (CSDS). She was the program chair for the 2nd International Workshop on Recent Advances in Intrusion Detection (RAID). A professor of Computer Science at the College of Integrated Science and Technology at James Madison University in Harrisonburg Virginia. He holds a Ph.D. in computer science from the University of Texas at Austin and a BA in philosophy from the University of Houston. Reynolds is the Director of Information System Security Education at James Madison University. Since 1997 Reynolds has led the development of the first remote Internet-based curriculum that leads to an M.S. degree in computer science with a concentration in information security. Thus far 160 students have completed this program. A professor of computer information systems at Idaho State University and the manager of its Simplot Decision Support Center.

T he only difference etween evolution and revolution is the speed at which each occurs.

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On-line system identification using context discernment

On-line system identification using context discernment

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International Joint Conference on Neural Networks, IJCNN 2005

作者： Holmstrom, Lars Santiago, Roberto Lendaris, George G. NW Computational Intelligence Laboratory Portland State University Portland OR 97201 Systems Science Ph.D. Program Department of Systems Science and Electrical and Computer Engineering

ISBN: (纸本)0780390482

Mathematical models are often used in system identification applications. The dynamics of most systems, however, change over time and the sources of these changes cannot always be directly determined or measured. To maintain model accuracy, it is desirable to design system identifiers that can adapt to these dynamical shifts. We use reinforcement learning to train an agent to recognize dynamical changes in a modeled system and to estimate new parameter values for the model. The subsequent actions of this agent are characterized as "moving" the parameterized model on an optimal trajectory in model parameter space. It is found that this method is capable of quickly and accurately discerning the correct parameter values. © 2005 IEEE.

关键词： Identification (control systems)

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Analysis and evaluation of a new MAC protocol for broadband wireless access

Analysis and evaluation of a new MAC protocol for broadband ...

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2005 International Conference on Wireless Networks, Communications and Mobile Computing

作者： De Moraes, L.F.M. Maciel Jr., P.D. High-Speed Networks Laboratory - RAVEL Systems Engineering and Computer Science Program COPPE/UFRJ Rio de Janeiro - RJ Brazil

ISBN: (纸本)0780393058

Broadband Wireless Access (BWA) systems offer a solution for broadband access and high data rate transmission of multimedia services with distinct Quality-of-Service (QoS) requirements through a wireless medium. IEEE 802.16 Standard specifies the PHY and MAC layers for BWA systems. However, in spite of including the possibility for QoS support, the standard does not define how to schedule different types of traffic. This article propose a new MAC protocol for BWA systems that incorporates a traffic scheduling mechanism based on messages and/or stations priorities. An analytical model to evaluate the performance of the proposed protocol is also developed and results obtained for the messages waiting times of different traffic classes are presented. © 2005 IEEE.

关键词： Network protocols

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Odyssey-VCS: A flexible version control system for UML model elements 05

Odyssey-VCS: A flexible version control system for UML model...

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12th International Workshop on Software Configuration Management, SCM 2005

作者： Oliveira, Hamilton Murta, Leonardo Werner, Cláudia COPPE/UFRJ - Systems Engineering and Computer Science Program Federal University of Rio de Janeiro P.O. Box 68511 21945-970 Rio de Janeiro Brazil

ISBN: (纸本)1595933107

Many current version control systems use a simple data model that is barely sufficient to manipulate source-code. This simple data model is not sufficient to provide versioning capabilities for software modeling environments, which are strongly focused on analysis and architectural design artifacts. In this work, we introduce a flexible version control system for UML model elements. This version control system, named Odyssey-VCS, deals with the complex data model used by UML-based CASE tools. Moreover, it allows the configuration of both the unit of versioning and unit of comparison for each specific project, respecting the different needs of the diverse development scenarios. Copyright © 2005 ACM.

关键词： Information management

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Location management for PCS networks with consideration of mobility patterns

Location management for PCS networks with consideration of m...

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IEEE INFOCOM 2005

作者： Li, Jie Kubota, Atsushi Kameda, Hisao Department of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba Sci. City Ibaraki 305-8573 Japan Doctoral Program in Science and Information Engineering University of Tsukuba Tsukuba Sci. City Ibaraki 305-8573 Japan

ISBN: (纸本)0780389689

This paper addresses the dynamic location management for personal communication service (PCS) networks with consideration of mobility patterns. The popular hexagonal cellular architecture is considered. In this paper, we first introduce a coordinate system for the hexagonal cellular architectures. Then, we develop an all-direction mobility model based on the coordinate system for the hexagonal cellular architecture to cope with the mobility patterns of mobile terminals (MTs). The shape and size of the local area (LA) in the dynamic location management scheme is determined by minimizing the total location management cost with bounding the paging cost The optimization problem is transferred to maximize expected number of cells traversed by the MT in the LA with a given size of the LA. The analytic model of calculating the probabilities of any MT's moving is established. An algorithm is proposed to solve the optimization problem efficiently. © 2005 IEEE.

关键词： Data transfer

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A guideline for parameter design of body surface laplacian electrodes and its application in EGG detection

A guideline for parameter design of body surface laplacian e...

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2005 27th Annual International Conference of the engineering in Medicine and Biology Society, IEEE-EMBS 2005

作者： He, Feng Li, Gang Lin, Ling Besio, Walter G. Lu, Stephen C.-Y. Inspiring Technical Laboratory College of Precision Instruments and Opto-Electronics Engineering Tianjin University Tianjin 300072 China Biomedical Engineering Program Center for Biomedical Engineering and Rehabilitation Science Louisiana Tech University LO United States Dept. of Aerospace and Mechanical Engineering Computer Science and Industrial and Systems Engineering University of Southern California CA 90089-1453

ISBN: (纸本)0780387406

The influence of dimension parameters on the performance of Body-surface Laplacian electrodes is studied in this paper. Some rules about the parameter optimization design are presented. The investigation suggests that the effective radius b should be equal to the inner radius of the ring electrode in order to reduce the relative error. Besides, in the presence of weak bioelectrical signals, reasonably increasing b would be helpful to improve SNR. Furthermore, an evaluation method based on these principles is prompted, as an instance of which, feasibility of introducing Surface Laplacian technique into EGG exploration is discussed. © 2005 IEEE.

关键词： Product design

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