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Integration of different system engineering methods using an object-oriented model

Integration of different system engineering methods using an...

引用

1992 Conference on Object-Oriented Programming systems, Languages, and Applications, OOPSLA 1992

作者： Clausen, Horst D. Hofmann, Anton Pawlitzek, Gabriele H. University of Salzburg Department of Computer Science and System Analysis Jakob-Haringer-Strasse 5 SalzburgA-5020 Austria German Aerospace Research Establishment Software Engineering Laboratory Munnchnerstrasse 20 OberpfaffenhofenD-8031 Germany

ISBN: (纸本)0897916107

The development of large, complex systems consisting of both hardware and software normally involves several companies and/or development teams for the development of the different subsystems forming the entire system. Depending on the kind of subsystem to be developed, these different development teams normally use different system engineering methodologies and/or tool sets to produce their subsystems. However, the usage of different methodologies and tools makes technical management and quality assurance for the entire development effort a difficult task. Therefore the development as well as the maintenance of future systems with their increasing size and complexity requires a common frame for the entire system development and maintenance effort covering different kinds of subsystems, like graphical user interfaces, database systems, expert systems, real-time systems, and so on. This common frame should support the separate and independent development of the different subsystems by different subcontractors using different system engineering methods, the integration of these subsystems to the entire system as well as the maintenance of the entire system. A hierarchical object-oriented model for the encapsulation and integration of different system engineering methods can serve as this common frame, providing traceability from the system requirements model to the implemented system while giving each subsystem development team full scope in choosing the system engineering method most suitable for a specific subsystem. The approach underlying this object-oriented model is the encapsulation of the different subsystems in "high-level objects," which can be either further decomposed into "high-level object" or described in more detail using any appropriate system engineering method. The integration of these "high-level objects" to the entire system is supported by a "definition object" on each layer of each system engineering model. The "definition objects" provide trace

关键词： Maintenance

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On the fault-tolerant support of the Distributed Logical Machine system

On the fault-tolerant support of the Distributed Logical Mac...

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International Conference on Communication systems

作者： Jim-Min Lin Shang Rong Tsai Computer System Laboratory Department of Electrical Engineering National Cheng Kung University Tainan Taiwan

This paper discusses the support for two different implementations of resilient Logical Machines. LM checkpoint/rollback and replicated LM execution, corresponding to backward and forward error recovery respectively. By LM approaches, one can effectively achieve fault-tolerance for node crash but eliminate some critical problems such as domino effect, live lock, and local dependencies.< >

关键词： Fault tolerant systems Fault tolerance computer crashes Mobile communication Virtual machining Distributed computing Power engineering computing Power system reliability Operating systems Condition monitoring

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Active tactile sensing by robotic fingers based on minimum-external-sensor-realization

Active tactile sensing by robotic fingers based on minimum-e...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： M. Kaneko H. Maekawa K. Tanie Computer Science and System Engineering Kyushu Institute of Technology Fukuoka Japan Robotics Department Mechanical Engineering Laboratory Tsukuba Japan

The authors discuss active tactile sensing for detecting a contact point between a multifingered robot hand and an unknown object. They define the concept of actively sensible meaning that an active sensing motion can be planned for a sensing event. Assuming more than two sensing events, conditional-minimum-external-sensor-realization is defined, where it is shown that it is possible to reduce the number of external sensors with a well-planned sensing algorithm. Based on these definitions, an active sensing algorithm for detecting the contact point with minimum-external-sensor-realization is proposed. This approach remedies several disadvantages found in conventional approaches. The approach was tested through experiments using a single-finger model with a fingertip tactile sensor.< >

关键词： Robot sensing systems Fingers Tactile sensors Object detection Shape Motion detection computer science systems engineering and theory Mechanical engineering Laboratories

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Self-posture changeability (SPC) for 3-D link system

Self-posture changeability (SPC) for 3-D link system

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IEEE International Conference on Robotics and Automation (ICRA)

作者： M. Kaneko K. Tanie Computer Science and System Engineering Kyushu Institute of Technology Fukuoka Japan Robotics Department Mechanical Engineering Laboratory Tsukuba Japan

The authors discuss the self-posture changeability (SPC) for a general 3-D link system. The series of motions brought about by SPC is called self-posture changing motions (SPCM). SPC and SPCM are considered assuming that the link system moves slowly enough to suppress any dynamic effects. It is shown that, according to a particular combination of link posture, joint assignment, and object shape, there exist a deadlock state, where no further angular displacement can be imparted to the position-controlled joint. It is also shown that there are two different types of deadlock states which never result in any SPCM. The authors introduce (w, omega )-posture changeability, the characteristic with which a link can change posture for every possible force within a cone of a prime axis w and a solid angle, omega . The necessary and sufficient conditions leading to (w, omega )-posture changeability are shown, for a given contact point and frictional conditions. a sufficient condition is included required to realize SPCM under the assumption that the contact point moves continuously over the object and the link-object system never results in a deadlock state.< >

关键词： Fingers Shape Tactile sensors Sufficient conditions Robot sensing systems Machine vision Force control Force sensors computer science systems engineering and theory

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A Homomorphic Harmony Network Approach to Solving the Unification Problem

A Homomorphic Harmony Network Approach to Solving the Unific...

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IJCNN International Joint Conference on Neural Networks

作者： Dian-xun Shuai Wen-Ju Liu Department of Computer Engineering Xian University of Electronic Science and Technology Laboratory of Intelligence Technology and System Tsinghua University Department of Computer Science and Technology Tsinghua University

＜正＞The unification problem is one of the most important and fundamental problems in many fields,such as artificial intelligence,knowledge engineering,intelligent robotics,deductive database,and new-type programming *** paper presents an AND-OR terms graph for representing a power set of terms,and establishes a homomorphic mapping from the terms graph to a Harmony network for solving the first order unification problem under some equational ***,in order to construct the homomorphic Harmony network an improved competitive activation mechanism is presented,which allows more than one nodes within an inhibitory cluster of nodes to be activated simultaneously and avoids running the time-consuming Harmony network learning algorithm based on complicated stochastic *** algorithm,given by this paper,used for getting the maximum Harmony state of the homomorphic Harmony network,which is associated with the solution of unification problems,can update network states in such a way that several nodes corresponding to the same variable in a given set of terms always result in the same value through a stochastic dynamic *** approach and the algorithms in this paper are superior to the traditional symbolic logic methods in the high parallelism, the ability of solving the unification problem between uncertain and incomplete terms,the ease of treating combination of several equational theories,and the adaptability for many various types of the unification problems,especially,for solving many terms’ unification simultaneously and parallelly.

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Neural Nets Simulation on Transputer

Neural Nets Simulation on Transputer

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IJCNN International Joint Conference on Neural Networks

作者： Sought Zhao T.S.Dillon Expert and Intelligence System Laboratory Applied Computing Research Institute Department of Computer Science&Computer Engineering La Trobe University BundooraVIC 3083Australia

Simulating a large artificial neural network to solve real-world application problems often requires large amounts of computational *** of the algorithm on conventional hardware are rather slow and direct VLSI or special purpose hardware implementations are rather *** this paper,it is investigated to simulate a fully connected multilayered feedforword neural network using the backpropagation learning algorithm on a distributed memory multiprocessor *** partitioning and data partitioning schemes and their algorithms are described and the network partitioning method was realized in a ring network topology of transputer *** almost linear acceleration result has been achieved.

关键词： Neural Networks Parallelism Transputer Backpropagation

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Obstacle detection for a vehicle using optical flow

Obstacle detection for a vehicle using optical flow

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1992 Intelligent Vehicles Symposium, IVS 1992

作者： Young, G.-S. Hong, T.-H. Herman, M. Yang, J.C.S. Bldg 220 Rm B124 GaithersburgMD2089 United States Robotics Laboratory Department of Mechanical Engineering University of Maryland College ParkMD20742 United States Department of Computer Science and Informatim System American University WashingtonDC20016 United States

ISBN: (纸本)078030747X

A novel approach to obstacle detection using optical flow without recovering range information has been developed. This method can be used for ground vehicles to navigate through man-made roadways or natural outdoor terrain or for air vehicles to land on known or unknown terrain. A linear relationship, plotted as a line and called a reference flow line, has been found. This reference flow line can be used to detect discrete obstacles above or below the reference terrain. Slopes of surface regions are also computed. The approach is simple, fast, and robust because: (1) the only required information is one component of the optical flow, (2) each image line can be processed in parallel, and (3) the error sources involved are reduced to a minimum. An initial experiment using noisy synthetic data is also included to demonstrate the applicability and robustness of the method. © 1992 IEEE.

关键词： Landforms

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Parallelization of AMBER molecular dynamics program for the AP1000 highly parallel computer

Parallelization of AMBER molecular dynamics program for the ...

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Scalable High Performance Computing Conference

作者： H. Sato Y. Tanaka H. Iwama S. Kawakika M. Saito K. Morikami T. Yao S. Tsutsumi Computer Systems Architecture Laboratory Fujitsu Laboratories Limited Kawasaki Japan Fujitsu Laboratories Limited Japan Protein Engineering Research Institute Fujitsu Kyushu System Engineering Limited

The authors have parallelized the AMBER molecular dynamics program for the AP1000 highly parallel computer. To obtain a high degree of parallelism and an even load balance between processors for model problems of protein and water molecules, protein amino acid residues and water molecules are distributed to processors randomly. Global interprocessor communication required by this data mapping is efficiently done using the AP1000 broadcast network, to broadcast atom coordinate data for other processors' reference and its torus network; also for point-to-point communication to accumulate forces for atoms assigned to other processors. Experiments showed that a problem with 41095 atoms is processed 226 times faster with a 512 processor AP1000 than by a single processor.< >

关键词： Concurrent computing Bonding Protein engineering Hydrogen Parallel processing Broadcasting Temperature computer architecture Laboratories Electronic mail

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An efficient decentralized approach to processor-group membership maintenance in real-time LAN systems: the PRHB/ED scheme

An efficient decentralized approach to processor-group membe...

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Reliable Distributed systems

作者： K.H. Kim H. Kopetz K. Mori E.H. Shokri G. Gruensteidl Department of Electrical & Computer Engineering University of California Irvine USA Department of Electrical & Computer Engineering University of California Irvine CA USA Technical University of of Vienna Austria Hitachi System Device Laboratory Japan University of California USA

In constructing highly reliable LAN systems, a mechanism that enables every active node to maintain timely and consistent knowledge about the health status of all cooperating nodes can be used as a cornerstone. The authors consider the case where maintenance of such knowledge is achieved in a decentralized manner and timely and consistent recognition of newly joining nodes is also facilitated. The authors develop an optimal version of H. Kopetz et al.'s (1985) periodic reception history broadcast (PRHB) method. The authors' version enables detection of failures with minimum latency and is called the PRHB with earliest detection (PRHB/ED). This scheme has much shorter latency than the previous PRHB scheme and is yet equally practical in the sense that it does not increase the communication traffic at all, and the complexity of the algorithm for analyzing the observations exchanged among the active nodes is still bounded by a linear function of the number of nodes in the system.< >

关键词： Local area networks Delay Real time systems Time division multiple access Maintenance Clocks Time division multiplexing History Broadcasting Telecommunication traffic

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Inter-Channel Interference Cancellation Technique for Cdma Mobile/personal Communication Base Stations

Inter-Channel Interference Cancellation Technique for Cdma M...

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IEEE International Symposium on Spread Spectrum Techniques and Applications

作者： S. Kubota S. Kato K. Feher NTT Radio Communication System Laboratories Yokosuka Japan Digital Communication Laboratory Department of Electrical and Computer Engineering University of California슠Davis Davis CA USA

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