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International Conference on Computational Science and its Applications (ICCSA)

作者： Ali Sajedi Badashian Mohammad Reza Razzazi Software Research and Development Laboratory Computer Engineering Department Azad University Lahijan Iran Software Research and Development Laboratory Computer Engineering and Information Technology Department Amirkabir University of Technology슠 Tehran Iran

In this paper we present an effective kinetic data structure (KDS) and algorithm for efficient maintenance of convex hull of moving points in 2d space. Given n objects continuously moving in the plane we present an efficient algorithm for maintaining their convex hull. Our algorithm considers cases based on status of a constant number of points. We show that our algorithm's time and space complexity are at most linear. A simulation program developed for testing the algorithm confirms the claim.

关键词： Kinetic theory Spirals Data structures Space technology software algorithms research and development Laboratories Maintenance engineering Computational geometry Delay

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Scalable Web Service Discovery on P2P Overlay Network

Scalable Web Service Discovery on P2P Overlay Network

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IEEE International Conference on Services Computing (SCC)

作者： Gang Zhou Jianjun Yu Rui Chen Hui Zhang National Digital Switching System Engineering and Technological Research and Development Center State Key Laboratory of Software Development Environment Beihang University China

Decentralized approaches for Web services discovery, such as peer-to-peer, become more and more attention - getting in the scientific community. In this paper, we propose a peer-to-peer framework, which adopts an enhanced skip graph named Servicelndex as the overlay network for service discovery. To guarantee discovery efficiency, Servicelndex schemed WSDL-S (Web services semantics) as semantic Web services description language and extracted its semantic attributes as indexing keys in skip graph. Also a multi-layer P2P overlay network was constructed to aggregate similar keys and keep load balancing on peer nodes. The evaluation showed that the Servicelndex system performs considerable service discovery efficiency.

关键词： Web services Peer to peer computing Aggregates Load management Scalability Protocols OWL Programming Switching systems Systems engineering and theory

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An Integrated software Environment For Powertrain Feasibility Assessment Using Optimization And Optimal Control

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Asian Journal of Control 2008年第3期8卷

作者： Ilya V. Kolmanovsky Jing Sun Shiva N. Sivashankar During the summer of 1993 he was a visiting scholar in the Department of Aeronautics and Astronautics Naval Postgraduate School Monterey CA where he worked on control systems for unmanned aerial vehicles. From 1993 to 2000 he was with Ford Research Laboratory working on several design aspects of powertrain control systems and processes for embedded control software development. He is currently the Vice President for Technology at Emmeskay Incorporated a company that provides systems engineering based products and services. His research interests include modeling and control of automotive systems application of systems engineering methods and tools to product development processes and multivariable robust control and estimation methods. Dr. Sivashankar has served as an associate editor for the ASME Journal of Dynamic Systems Measurement and Control.

With the increase in automotive powertrain complexity, an upfront assessment of powertrain capability in meeting its design targets is important early on in the development programs. The optimization of control policy based on powertrain simulation models can facilitate this assessment and establish limits of achievable performance for a given powertrain configuration and parameters. The paper discusses several computational optimization and user interface solutions for deploying a numerical optimal control approach in a user-friendly software environment.

关键词： Powertrain control powertrain assessment optimal control optimization dynamic programming

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Starting a software product line by reengineering a set of existing product variants

Starting a software product line by reengineering a set of e...

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2006 SAE World Congress

作者： Yoshimura, Kentaro Bayer, Joachim Ganesan, Dharmalingam Muthig, Dirk Automotive Research and Development Laboratory Hitachi Europe 18 rue Grange Dame Rose 78140 Velizy France Fraunhofer Institute for Experimental Software Engineering Germany

Today's vehicles integrate many diverse types of electronic control units, many of which can be found in every vehicle, such as in braking systems, engine control systems, or body control units. For every type of vehicle, however, individual variants (of each of these units) must be created to fulfill system requirements, which vary as to vehicle types, characteristics, wishes and strategy of vehicle manufacturers, or laws valid in different target markets. Nevertheless, variants of the same type of control unit share many common characteristics, as well as partially vary within a well-defined spectrum determined by a set of system parameters. In order to make system development more efficient, commonalities and predictable variability should be systematically exploited;software product line engineering, for example, is an approach that aims at such a systematic exploitation. The goal of product line engineering (high-level of reuse across products) is clear. Its implementation in practice, however, is a challenge in many domains and organizations. This paper presents early software product line activities which have been performed during the initialization phase of the Fraunhofer PuLSE™ (Product Line software and System engineering) approach. The activities analyze an existing set of related control units and identify common and varying characteristics of these solutions delivered to customers in the past. Based on the results of the analysis, an action plan is derived for merging pieces of different, existing systems to form the basis of a future software product line. Copyright © 2006 SAE International.

关键词： Computer software

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Multimodal error correction for continuous handwriting recognition in pen-based user interfaces 06

Multimodal error correction for continuous handwriting recog...

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IUI 06 - 2006 International Conference on Intelligent User Interfaces

作者： Wang, Xugang Li, Junfeng Ao, Xiang Wang, Gang Dai, Guozhong Intelligence Engineering Lab. Institute of Software Chinese Academic of Science Beijing 100080 China Laboratory of Computer Science Institute of Software Chinese Academic of Science Beijing 100080 China France Telecom Research and Development Beijing Beijing 100080 China

ISBN: (纸本)1595932879

In this paper, we describe a multimodal error correction mechanism. It allows the user to correct errors in continuous handwriting recognition naturally by simultaneously using pen gesture and speech. A multimodal fusion algorithm is designed to enhance recognition accuracies of handwriting and speech through cross-modal influence. We have performed preliminary evaluation experiments and the results show that this multimodal mechanism can efficiently correct the errors in continuous handwriting recognition.

关键词： Character recognition

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A CLASS OF COMPACT UPWIND TVD DIFFERENCE SCHEMES

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Applied Mathematics and Mechanics(English Edition) 2006年第6期27卷 765-772页

作者：涂国华袁湘江夏治强呼振 China Aerodynamics Research and Development Center Mianyang 621000 Sichuan ProvinceP. R. China National CFD LaboratoryBeijing 100083P. R. China Center for Information Analysis Research Institute of Chemical Defense Beijing 102205P. R. China School of Software Engineering Tongji University Shanghai 200331P. R. China

A new method was proposed for constructing total variation diminishing （TVD） upwind schemes in conservation forms. Two limiters were used to prevent nonphysical oscillations across discontinuity. Both limiters can ensure the nonlinear compact schemes TVD property. Two compact TVD （CTVD） schemes were tested, one is thirdorder accuracy, and the other is fifth-order. The performance of the numerical algorithms was assessed by one-dimensional complex waves and Riemann problems, as well as a twodimensional shock-vortex interaction and a shock-boundary flow interaction. Numerical results show their high-order accuracy and high resolution, and low oscillations across discontinuities.

关键词： high-order difference schemes compact schemes TVD schemes shock- vortex shock-boundary

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Discovering Organizational Aspects from the Source Code History Log during the Product Line Planning Phase--A Case Study

Discovering Organizational Aspects from the Source Code Hist...

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Working Conference on Reverse engineering

作者： Dharmalingam Ganesan Dirk Muthig Jens Knodel Kentaro Yoshimura Fraunhofer Institute of Experimental Software Engineering (IESE) Kaiserslautern Germany Research and Development Laboratory Hitachi Europe Automotive France

ISBN: (纸本)9780769527192

How to introduce software product line engineering (PLE) in the presence of existing stand-alone similar systems remains a challenging question for many organizations. This paper reports on a reverse engineering approach to understanding the organizational aspects during the product line planning phase. The organizational aspects include domain expert identification, understanding the organization's development or team structure, and predicting the existing product architecture using the organization's architecture. In addition, this paper highlights how the source code change history log provides valuable data for various product line related activities, such as scoping, architecture evaluation, reengineering towards product line and project management in the product line context. The proposed approach is validated by means of the engine control systems of Hitachi. The results show that change history can be used to identify experts of the system or components, among other things

关键词： History Computer architecture Automotive engineering Project management Reverse engineering Knowledge management software engineering Europe research and development Stability

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Predicting return-on-investment for product line generations

Predicting return-on-investment for product line generations

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International software Product Line Conference (SPLC)

作者： D. Ganesan D. Muthig K. Yoshimura Fraunhofer Institute of Experimental Software Engineering (IESE) Kaiserslautern Germany Hitachi Europe Automotive Research and Development Laboratory Velizy France

The decision of an organization to introduce product line engineering depends on a sound and careful analysis of risks and return on investment. The latter is computed by an economic model, which relies on high quality input and must reflect the envisioned migration strategy sufficiently. To facilitate risk analysis, this paper applies Monte-Carlo simulation to an existing product line economic model. Additionally, the model is extended by the support of product line generations that is, considering the degeneration of product line infrastructures and taking reinvestment into an existing product line into account. The practical application of the model is demonstrated by an industrial case study

关键词： Economic forecasting Investments software engineering Acoustical engineering Automotive engineering Risk analysis Computational modeling Predictive models Uncertainty Europe

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Providing means for precision airdrop delivery from high altitude

Providing means for precision airdrop delivery from high alt...

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AIAA Guidance, Navigation, and Control Conference 2006

作者： Hattis, Philip D. Campbell, Darryn P. Carter, David W. McConley, Marc Tavan, Steve Draper Laboratory Cambridge MA 02139 United States US Army Research Development and Engineering Command Natick Soldier Center Natick MA 01760 United States Mission Design and Analysis Group 555 Technology Square Mail Stop 77 AIAA United States Embedded Software Group 555 Technology Square Mail Stop 77 Decision Systems Group 555 Technology Sauare Mail Stop 77 United States Tactics Guidance and Control Group 555 Technology Square Mail Stop 77 Precision Airdrop GN and C Research NSC Airdrop Aerial Delivery Directorate AMSRD-NSC-AD-JP Kansas Street United States

ISBN: (纸本)1563478196

Precision airdrop is essential to insertion of military and humanitarian supplies at remote, globally distributed locations that are involved in conflict or have experienced natural disasters. Enabling precision payload delivery following high altitude release limits risk to carrier aircraft For the past eight years, the Army and Air Force have combined resources to facilitate major advances in precision, high altitude airdrop. This includes new means for on-board airdrop mission planning for an expanding set of ballistic parachute and guided parafoil airdrop systems that realize accuracy improvement by using detailed system dynamics models, high fidelity atmospheric state models, and means to generate and upload revised mission plans for guided airdrop systems. development and implementation of an open-architecture Guidance, Navigation, and Control (GN&C) system has also been pursued for use on large parafoil airdrop systems. Implementation features of the personal computer-based Precision Airdrop System (PADS) mission planner are reviewed and the parafoil GN&C design features are discussed. A review is provided of payload delivery performance realized using the PADS for a variety of ballistic and guided airdrop systems and using the GN&C system on the Dragonfly 10,000-lb class parafoil. Continued capability development plans for PADS and the GN&C system are also summarized. Copyright © 2006 by the Charles Stark Draper laboratory, Inc.

关键词： Electronic guidance systems

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An on-board mission planning system to facilitate precision airdrop

An on-board mission planning system to facilitate precision ...

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InfoTech at Aerospace: Advancing Contemporary Aerospace Technologies and Their Integration

作者： Campbell, Darryn Fill, Thomas Hattis, Philip Tavan, Steven Draper Laboratory Cambridge MA 02139 US Army Research Development and Engineering Command Natick MA 01760 Embedded Software Group Mail Stop 31 555 Technology Square Guidance and Control Group Mail Stop 70 555 Technology Square AIAA Mission Design and Analysis Group Mail Stop 77 555 Technology Square Airdrop/Aerial Delivery Directorate AMSRD-NSC-AD-JP Kansas Street

ISBN: (纸本)1563477394

The Precision Airdrop System (PADS), a laptop computer-based airdrop planning system, enables a crew on-board carrier aircraft to improve payload delivery precision for high atitude airdrops. It is also used for personnel airdrop mission planning. A core element of PADS is the Precision Airdrop Planning System (PAPS) that includes accurate models of an expanding set of airdrop systems. PAPS enables in-flight airdrop mission planning, including release point determination for ballistic parachute airdrop systems, as well as release envelopes and mission plans for guided airdrop systems. PAPS is integrated within PADS with the WindPADS wind field determination system to enable precision delivery by anticipating the descent trajectory behavior of airdrop systems in the vicinity of Drop Zones (DZs). PADS has graphical interfaces that have the look and feel of the Portable Flight Planning System which is already used by the Air Force on-board its aircraft. PADS acquires meteorological and DZ target data through a variety of aircraft communication links, and provides mission updates to guided airdrop systems shortly before their release. Using FalconView, PADS provides an interface to display release points/envelopes and failed payload expected impact footprints over maps or images of the terrain near the DZ. PADS currently accommodates a variety of 2,000-Ib-class ballistic and guided airdrop systems released from C-130 and C-17 aircraft. The ballistic airdrop planning capability has undergone Operational Utility Evaluation (OUE) with both aircraft classes, and is already in limited field use. For airdrops from both 18,000 feet and 25,000 feet, the OUE demonstrated a Circular Error Probable of 260 m for C-130 drops and 308 m for C-17 drops. PADS support capability for guided airdrops is completing flight evaluation, in preparation for use in the field. In addition, PADS support capabilities for 10,000-30,000 Ib-class airdrop systems is in development. Copyright © 2005 by C

关键词： Aerospace engineering

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