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AIAA SPACE Conference and Exposition 2011

作者： Cohen, Nicholas C. Richardson, Gregory G. Martinelli, Scott K. Betser, Joseph The Aerospace Corporation Engineering Data Analysis and Integration Department Acquisition Analysis and Planning Subdivision Systems Engineering Division El Segundo CA 90245 United States The Aerospace Corporation Space Architecture Engineering and Cost Department Acquisition Analysis and Planning Subdivision Systems Engineering Division El Segundo CA 90245 United States The Aerospace Corporation Space Architecture Department Architecture and Design Subdivision Systems Engineering Division El Segundo CA 90245 United States The Aerospace Corporation Computers and Software Division El Segundo CA 90245 United States

ISBN: (纸本)9781600869532

This paper studies the potential demand for on-orbit satellite servicing in geosynchronous orbit (GEO). This paper assumes that the capability to perform on-orbit servicing in GEO exists and that operational vehicles could consider servicing alternatives as vehicles approach their end of operational life. Using a database of spacecraft anomalies maintained by The Aerospace Corporation, cases of GEO satellites launched since 1990 that are no longer operational are identified. The end of life may be due to unexpected failure or due to planned depletion of consumables. Each mission is evaluated to determine whether a servicing mission might have extended the useable lifetime of the spacecraft. Several degrees of servicing are determined to address different ways a satellite's operational life ends. An evaluation summary is presented to show the need for different types of servicing, and specific cases of non-operational satellites demonstrate the different servicing needs. By studying launches over a period of 20 years, 86 spacecraft were identified which could benefit from servicing. Relocation and refueling missions are the simplest servicing missions to implement in the near-term, and also represent categories with the largest demand. Repair missions, particularly internal repair, likely present a much more difficult category. © 2011 by The Aerospace Corporation. Published by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Satellites

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Automatic Dent-landmark Detection in 3-D CBCT Dental Volumes

Automatic Dent-landmark Detection in 3-D CBCT Dental Volumes

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Erkang Cheng Jinwu Chen Jie Yang Huiyang Deng Yi Wu Vasileios Megalooikonomou Bryce Gable Haibin Ling Center for Data Analytics & Biomedical Informatics Computer & Information Science Department Temple University Division of Oral and Maxillofacial Radiology School of Dentistry Temple University College of Computer and Software Nanjing University of Information Science & Technology Data Engineering Laboratory Temple University

ISBN: (纸本)9781424441211

Orthodontic craniometric landmarks provide critical information in oral and maxillofacial imaging diagnosis and treatment planning. The Dent-landmark, defined as the odontoid process of the epistropheus, is one of the key landmarks to construct the midsagittal reference plane. In this paper, we propose a learning-based approach to automatically detect the Dent-landmark in the 3D cone-beam computed tomography (CBCT) dental data. Specifically, a detector is learned using the random forest with sampled context features. Furthermore, we use spacial prior to build a constrained search space other than use the full three dimensional space. The proposed method has been evaluated on a dataset containing 73 CBCT dental volumes and yields promising results.

关键词： Three dimensional displays Training Context Feature extraction Vegetation Dentistry Testing

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engineering spacecraft mission software using a model-based and safety-driven design methodology

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Journal of Aerospace Computing, Information and Communication 2006年第11期3卷 562-586页

作者： Weiss, Kathryn Anne Dulac, Nicolas Chiesi, Stephanie Daouk, Mirna Zipkin, David Leveson, Nancy Jet Propulsion Laboratory Pasadena CA 91109 Massachusetts Institute of Technology Cambridge MA 02139 Flight Software and Data Systems Section M/S 301-225 4800 Oak Grove Drive AIAA Department of Aeronautics and Astronautics 77 Mass. Ave. #33-407 Engineering Systems Division 77 Mass. Ave. #33-407 Department of Aeronautics and Astronautics 77 Mass. Ave. #33-336

This paper outlines an integrated approach to system, software, and safety engineering for today's complex, safety-critical systems. Intent Specifications, component-based systems engineering, and a new hazard analysis technique based on the Systems Theoretic Accident Modeling and Process (STAMP) are all combined in a seamless, safety-driven design methodology. This integrated approach to system software development is demonstrated through an example application of the techniques on a low-Earth orbiting satellite. The results of performing the system modeling, hazard analyses, and model simulations of the spacecraft as a whole are also presented. Finally, the approach is compared to other, current model-based systems engineering and hazard analysis techniques. Copyright © 2006 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Computer software

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An automated seamless mosaicing system of multi-charge coupled devices of panchromatic data

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Journal of the Indian Society of Remote Sensing 2004年第1期32卷 103-111页

作者： Ramakrishnan, R. Manthira Moorthi, S. Padmanabhan, N. Gupta, P. Data Products Software Division Signal and Image Processing Group Space Applications Centre (ISRO) Ahmedabad-380 015 India Department of Computer Science and Engineering Indian Institute of Technology Kanpur Kanpur 208 016 India

Panchromatic data of pixel resolution 5.8 m obtained from IRS-IC and IRS-ID satellites proved to be very useful for mapping purposes. One of the popular data product is the 70 km swath mosaic which is covered by a combination of 3 CCD line sensors, each with 4096 pixels. Each CCD-line sensor with different imaging times causes geometric problems of mosaicing three strips data together. In this paper, we propose the details of the design elements of system that caters to the need for accurate and automatic multi strip image registration without any second resampling of the data. The systematic geometric correction grid mapping is improved to facilitate accurate mosaicing by automatic image registration task that makes use of the overlap data within image strips and image registration is achieved up to sub-pixel level.

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Integrating mobile agent infrastructures in operational ERP systems 4

Integrating mobile agent infrastructures in operational ERP ...

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4th International Conference on Enterprise Information Systems, ICEIS 2002

作者： Vontas, Apostolos Koutsakas, Philippos Athanasopoulou, Christina Koumpis, Adamantios Hatzaras, Panos Manolopoulos, Yannis Vassilakopoulos, Michael ALTEC S.A. Software Business Unit Research Programmes Division Mich. Kalou 6 ThessalonikiGR - 546 29 Greece Data Engineering Laboratory Department of Informatics Aristotle University of Thessaloniki GR 54006 Greece

ISBN: (纸本)9729805067

In this paper we present our most recent work carried out in the wider context of the IST-ADRENALIN project, to facilitate formation and lifecycle management of networked enterprises. The projects focus is in designing and building an execution "kernel" for mobile agent applications written in Java, using the Aglets platform and integrating it with any existing ERP system. For integrating mobile agent infrastructures in operational ERP systems, we developed a generic model, which we call Mobile Agent Model, and which encompasses two parts concerning the Agent Logic and the Agent Proprietary data, analysed in more detail in this paper. This model is branch independent and builds on the Adrenalin Company concept, where the fractal and the Information supply chain concepts are combined, introducing that every process, activity and resource can be defined with the "triangle" of executor - controller - co-ordinator tasks, supporting characteristics of self-similarity, self-organisation, self-optimisation and dynamic organisational behaviour.

关键词： Fractals

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ASYNCHRONOUS TRANSFER MODE (ATM) OPERATION VIA SATELLITE - ISSUES, CHALLENGES AND RESOLUTIONS

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 211-222页

作者： CHITRE, DM GOKHALE, DS HENDERSON, T LUNSFORD, JL MATHEWS, N COMSAT Laboratories 22300 Comsat Drive Clarksburg MD 20871 USA. Received his B.Sc. from the University of Bombay India an M.A. in mathematics from the University of Cambridge U.K. and a Ph.D. in physics from the University of Maryland. He is currently an Associate Executive Director of the Network Technology Division at COMSAT Laboratories. He has been involved in research and development activities in ISDN VSAT networks data communications and network systems and architectures. Prior to his current positions Dr. Chitre was a Principal Scientist in the Network Technology Division at COMSAT Laboratories. Dr. Chitre joined COMSAT Laboratories in 1980. He has made major contributions to the analysis and architecture of data communication ISDN and BISDN via satellite. Dr. Chitre directs and participates in the international and national standards activities in ISDN BISDN and data communication as they apply to satellite communication. He was Chairman of the Working Group on Protocols and Network Timing Function of the CCIR/CCITT Joint Ad Hoc Group on ISDN-Satellite Matters during 1990–1992. Currently he is the Chairman of the Working Group on New Technologies in the ITU Intersector Coordinating Group (ICG) on Satellite Matters. Dr. Chitre was a programme manager during 1990 and 1991 on a contract from INTELSAT on systems studies on satellite communications systems architectures for ISDN and broadband ISDN systems. Currently he is the technical manager of the DoD Contract on ATM via satellite demonstration and the programme manager for the INTELSAT contract on analysis and top-level specification of INTELSAT ISDN subnetworks and SDH compatible transport network. Department manager for ISDN/Data Communications in the Network Technology Division of COMSAT Laboratories. His responsibilities include managing the implementation of next generation telecommunication systems for fixed and mobile satellite systems. Current projects include the development of a high data rate gateway switch that provides for the

Key issues regarding the operation of the broadband integrated services digital network (BISDN) via satellite are presented herein. The specific issues, challenges, and their resolutions are detailed. In particular, the impact of error characteristics and propagation delay on the operation of BISDN via satellite is discussed. Solutions are presented for removing adverse effects and providing high-quality service to users of BISDN via satellite.

关键词： ATM BISDN

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THE CALLING(SM) NETWORK - A GLOBAL WIRELESS COMMUNICATION-SYSTEM

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第1期12卷 45-61页

作者： TUCK, EF PATTERSON, DP STUART, JR LAWRENCE, MH Calling Communications Corporation. 1900 West Garvey Ave South. Suite 200 West Covina CA 91790 USA. Chairman of Calling Communications Corporation. He is also the Managing Director of Kinship Venture Management Inc. the general partner of Kinship Partners 11 and a General Partner of Boundary the general partner of The Boundary Fund. As a venture capitalist he has founded or participated in founding several telecommunications companies including Calling Communications Corporation Magellan Systems Corporation manufactures of Global Positioning System receivers Applied Digital Access manufacturer of DS-3 test access and network performance monitoring equipment Endgate Technology Corporation specialists in satellite phased array antennas and Poynting Systems Corporation. now a division of Reliance Corporation manufacturers of fibre optic transport equipment. He was a founder of Kebby Microwave Corporation where he invented the first solid-state. frequency-modulated commercial microwave link system. The company was acquired by ITT Corporation where he rose to the position of V.P. and Technical Director of ITT North America Telecommunications Inc. Subsequently he was V.P. of Marketing and Engineering at American Telecommunications Inc. (ATC). He was founding Director of American Telecom Inc. a joint venture between ATC and Fujitsu and has served on more than 20 boards of directors including those of three public companies. He has authored articles on microwave engineering and telephone signalling and was a contributor to Reference Data For Radio Engineers. He is a graduate of the University of Missouri at Rolla where he was later awarded an honorary Professional degree and serves on its Academy of Electrical Engineering. Mr Tuck is a Senior Member of the IEEE a Fellow of the Institution of Engineers (Australia) a Professional Member of the AIAA and a registered professional engineer in three states. More than 25 years of experience in the telecommunications industry where he has been responsibl

There is a very large demand for basic telephone service in developing nations, and remote parts of industrialized nations, which cannot be met by conventional wireline and cellular systems. This is the world's largest unserved market. We describe a system which uses recent advances in active phased arrays, fast-packet switching technology, adaptive routeing, and light spacecraft technology, in part based on the work of the Jet Propulsion Laboratory and on recently-declassified work done on the Strategic Defense Initiative, to make it possible to address this market with a global telephone network based on a large low-Earth-orbit constellation of identical satellites. A telephone utility can use such a network to provide the same modern basic and enhanced telephone services offered by telephone utilities in the urban centres of fully-industrialized nations. Economies of scale permit capital and operating costs per subscriber low enough to provide a service to all subscribers, regardless of location, at prices comparable to the same services in urban areas of industrialized nations, while generating operating profits great enough to attract the capital needed for its construction. The bandwidth needed to support the capacity needed to gain these economies of scale requires that the system use K(alpha)-band frequencies. This choice of frequencies places unusual constraints on the network design, and in particular forces the use of a large number of satellites. Global demand for basic and enhanced telephone service is great enough to support at least three networks of the size described herein. The volume of advanced components, and services such as launch services, required to construct and replace these networks is sufficient to propel certain industries to market leadership positions in the early 21st Century.

关键词： LOW EARTH ORBIT SATELLITE COMMUNICATIONS FAST PACKET SWITCHING EARTH FIXED CELLS ADAPTIVE ROUTEING LIGHT SPACECRAFT K(A) BAND PHASED-ARRAY ANTENNAS

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APPLYING VECTOR PROCESSING TO ACTIVE SONARS FOR INCREASED ACCURACY AND AN EXPANDED OPERATING ENVELOPE

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NAVAL ENGINEERS JOURNAL 1991年第3期103卷 231-239页

作者： WHITNEY, DA BENEDICT, TJ David A. Whitneyis a division staff analyst in the Strategic Systems Division at TASC Reading Mass. He has B.S. and M.S. degrees in mathematics and statistics from Princeton University and the University of Illinois and has completed additional graduate work toward a Ph.D. at MIT. He has directed a number of algorithm development and data analysis activities in support of the U.S. Navy's Trident programs and has authored several technical papers. Mr. Whitney is currently involved in development and field testing of passive sonar signal processing algorithms and directs a R&D activity in the area of parallel processing applications for ASW. Lt Terry J. Benedict USNis an engineering duty officer in the U.S. Navy and is currently assigned as the assistant section head for missile engineering at Strategic Systems Programs Washington D.C. He has a B.S. degree in management from the U.S. Naval Academy and M.S. degree in weapons systems engineering from the Naval Postgraduate School. He formerly served as the system software development officer for the Navigation Branch at Strategic Systems Programs and shared responsibilities for the design development testing and configuration control of the Navigation Subsystem software.

Advanced computing technology development now allows considerable computational power to be packaged in small, modular components for low costs. In particular, vector and array processor add-on boards offer a way to incorporate modern parallel capabilities into existing hardware systems. In addition to cost efficiency, the fact that these boards may be able to plug-in to existing computer systems provides both design flexibility and a more rapid way of upgrading deployed computer hardware. To take advantage of such processing capabilities, however, algorithm analysis must be performed to determine what functions can be efficiently off-loaded to the vector processing board, and to decide what parts of the original serial algorithm should be redesigned to take advantage of the new hardware architecture. This paper presents a case study of how these issues are being addressed in a real-time active sonar data processing system. Vector processing technologies are being analyzed for application to correlation sonar systems used for estimating ship velocity on submarines, surface ships, and autonomous underwater vehicles. Such a system is deployed on Trident II SSBNs and is meeting its current design objectives. However, real-time operation of the correlation sonar is computationally intensive and fully utilizes the processing power of the fielded computing hardware. Expansions in the accuracy and operating envelope of the system are desirable and are not limited by the physics or practical operation of the sonar system, but rather by the speed at which processing of hydrophone returns can be performed. This analytic feasibility study investigates the possibility of expanding the operating envelope through the use of vector processing technology, within the constraint that any hardware or software changes would have minimal impact on the deployed system. It is predicted that significant speedups and operating envelope expansions can be achieved by introducing vectorized ha

关键词： Sonar

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Configuration control for evolutional software products 6

Configuration control for evolutional software products

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6th International Conference on software engineering, ICSE 1982

作者： Shigo, Osamu Wada, Yoshio Terashima, Yuichi Iwamoto, Kanji Nishimura, Takashi Software Product Engineering Laboratory Nippon Electric Co. Ltd. 4-I-I Miyazaki Miyamae-ku Kawasaki-city213 Japan Data Terminals Division Nippon Electric Co. Ltd. Japan NEC Software Chubu Ltd. Japan Information-Technology Promotion Agency Japan

This paper describes the concept of and a system for configuration control for evolutional software products, in which a wide spectrum of varied software products are being continuously evolved, along with rapid advancements in hardware technologies. The system contains a database for dealing with the overall configuration structure, including hierarchical product structure with change status, master file directories, difficulty occurrences and user information. The data representing the configuration can be in more abstract or macroscopic level than the traditional software configuration control, since the configuration manager should control the overall outlines for all software products. The concept and system described in the paper have been used for intelligent terminal software product management in NEC's data Terminals division. © 1982 IEEE.

关键词： Information management

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DESIGN AND EVALUATION OF A RECEPTOR

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PATTERN RECOGNITION 1979年第4期11卷 277-288页

作者： SUTO, Y HAYASHI, Y Medical Equipment Division Toshiba Corporation Kawasaki 213 Japanwas born in Japan in July 193 He received M.S. and Ph.D. degrees in administration engineering from Keio University Yokohama Japan in 197 and 1977 respectively. From 196 to 1978 he was with the Electronic Computer Division Toshiba Corporation Tokyo Japan engaged in the development of computer application software. He is currently with the Medical Equipment Division Toshiba Corporation and is concerned with nuclear medical data processing. Dr. Suto is a member of the Japan Society of Medical Electronics and Biological Engineering the Japan Society of Ergonomics and the Information Processing Society of Japan.YoshioFaculty of Engineering Keio University Yokohama 223 Japan was born in Tokyo Japan in September 192 He received M.D. and Ph.D. degrees from Keio University Tokyo Japan in 1960 and 1967 respectively. From 195 to 1965 he was associated with the school of Medicine Keio University. He is currently a Professor in the Department of Administration Engineering Keio University. He has been concerned with human engineering system engineering and bioengineering and is presently engaged in research in the areas of pattern recognition. Dr. Hayashi is a member of the Japan Society of Ergonomics the Operations Research Society of Japan and the Society of Instrument and Control Engineers of Japan.

A pattern recognition system is divided into two parts, a receptor and a categorizer. In this research, a creative receptor is designed, and then an effective pattern recognition system based on the receptor is constituted. The receptor is composed of a set of unique matrix operators which allow it to perform efficient feature measurement extraction. The feature measurements are ranked in effective order, based on another function of the receptor. For the categorizer, a well-known optimization theory is applied. To evaluate the performance of this system, some evaluation functions are defined. Therefore, the receptor mechanism is optimized by the functions. This system is experimentally evaluated by computer simulations.

关键词： Receptor Categorizer Mapping operator Discriminant function Picture primitives System evaluator

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