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Simulation Winter Conference

作者： M.A. Dummler Department of Distributed Systems Institute of Computer Science University of Würzburg Wurzburg Germany

This paper presents a series of experiments that were conducted to investigate in the nonstationary behavior of a wafer fab after changes in product mix. The experiments were performed using a simulation model of the front end area of an existing semiconductor fab. We observe how short-term increases in wafer starts of a product influence the cycle time and WIP of this product and of the other products. It is examined how the fab recovers from such production surges under different dispatch rules. We also investigate how different lot start mechanisms affect the short term fab performance. More specifically, we observe the effects of changing the mix of the lots started into the fab on a weekly basis. Finally, we compare two alternative ways of releasing lots into the fab: the first is to distribute lot starts evenly over a given period, e.g. a week, and the other is to start all lots at the beginning of the period.

关键词： Surges Semiconductor device modeling computer science Computational modeling Throughput Production planning Electric breakdown Semiconductor device breakdown Steady-state Measurement

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Scalability issues in CORBA

Scalability issues in CORBA

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IEEE International Workshop on Software Engineering for Parallel and distributed systems

作者： Manjula Rani Vijay Srinivas Janaki Ram Distributed Object Systems Lab Department of Computer Science & Engg Indian Institute of Technology Chennai India

Scalability is recognised as a primary factor to be considered in the design of distributed systems. The scalability of object-oriented middleware CORBA is becoming a major concern as it has emerged as a standard architecture for distributed object computing. In this paper, a systematic scalability analysis of the basic components of the CORBA specification is attempted. From this analysis, the Portable Object Adapter (POA) and the Implementation Repository (IR) are identified to influence the scale of a CORBA-based system. The specification of the POA provides enough feasibility for the application designer to handle scalability. The existing implementations of IR have a tradeoff between scalability and object migration. A scalable design of the IR is proposed which allows individual objects to migrate without compromising scalability. A performance comparison of the proposed model with existing IR designs is made using a simulation study.

关键词： Client-server systems

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Generic programming: International seminar on generic programming dagstuhl castle, Germany, April 27-May 1, 1998 selected papers

Generic programming: International seminar on generic progra...

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International Seminar on Generic Programming, 1998

作者： Jazayeri, Mehdi Loos, Rüdiger G. K. Musser, David R. Technical University of Vienna Information Systems Institute Distributed Systems Group Argentinierstr. 8/184-1 Vienna Austria Universität Tübingen Wilhelm-Schickard-Institut für Informatik Sand 13 Tübingen Germany Rensellaer Polytechnic Institute Computer Science Department TroyNY United States

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Reusable integrated components of inter-related patterns for software development

Reusable integrated components of inter-related patterns for...

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Asia-Pacific Conference on Software Engineering

作者： J. Ram M. Sreekanth Distributed Object Systems Laboratory Department of Computer Science & Engineering Indian Institute of Technology Madras Chennai India

Patterns are a means for capturing experience in solving general problems. They give general solutions to common and recurring problems. They exist at various phases of the software development life-cycle (SDLC), namely the analysis phase, the design phase, the coding phase and the testing phase. Patterns in each phase are identified independently. It is possible for the patterns of one phase to be related to patterns in other phases. This paper proposes pattern mapping to inter-relate the patterns of various phases in SDLC to address this issue. It is advantageous to capture the related patterns of different phases as a single unit for software development. Reusable integrated components (ICs) of patterns are proposed to capture the related patterns. A software IC is a group of inter-related patterns, that gives solutions for a recurring problem at various phases of SDLC. A representation mechanism for ICs is presented using the URA (Unified Representation of an Artifact) model, which captures the software development process. Also, this paper proposes a software development process that is based on reusable ICs of patterns. The representation of a software project developed using ICs is also discussed.

关键词： Programming Pattern analysis Integrated circuit modeling Object oriented modeling Software design computer science Life testing Software testing Software engineering Software reusability

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StreamJoin: a generic database approach to support the class of stream-oriented applications

StreamJoin: a generic database approach to support the class...

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International Symposium on Database Engineering and Applications (IDEAS)

作者： C. Nippl R. Rantzau B. Mitschang Department of Computer Science Technical University Munich Munich Germany Institute of Parallel and Distributed High Performance Systems University of Stuttgart Stuttgart Germany

Today many applications routinely generate large quantities of data. The data often takes the form of (time) series, or more generally streams, i.e. an ordered sequence of records. Analysis of this data requires stream processing techniques which differ in significant ways from what current database analysis and query techniques have been optimized for. In this paper we present a new operator, called StreamJoin, that can efficiently be used to solve stream-related problems of various applications, such as universal quantification, pattern recognition and data mining. Contrary to other approaches. StreamJoin processing provides rapid response times, a non-blocking execution as well as economical resource utilization. Adaptability to different application scenarios is realized by means of parameters. In addition, the StreamJoin operator can be efficiently embedded into the database engine, thus implicitly using the optimization and parallelization capabilities for the benefit of the application. The paper focuses on the applicability of StreamJoin to integrate application semantics into the DBMS.

关键词： Databases Data analysis Proteins Itemsets Application software Data mining Sequences Decision support systems computer science Pattern recognition

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Workshop on software and performance [Guest Editors' Introduction]

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IEEE Transactions on Software Engineering 2000年第12期26卷 1121-1121页

作者： A.M.K. Cheng P. Clements M. Woodside Department of Computer Science University of Houston Houston TX USA Software Engineering Institute Carnegie Mellon University Pittsburgh PA USA Real-Time and Distributed Systems Group Department of Systems and Computer Engineering Carleton University Ottawa ONT Canada

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Optimal scheduling of iterative data-flow programs onto multiprocessors with non-negligible interprocessor communication 7th

Optimal scheduling of iterative data-flow programs onto mult...

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7th International Conference on High-Performance Computing and Networking, HPCN Europe 1999

作者： Antony Louis Piriyakumar, D. Levi, Paul Siva Ram Murthy, C. Institute of Parallel and Distributed High-Performance Systems University of Stuttgart Stuttgart70565 Germany Department of Computer Science and Engineering Indian Institute of Technology Chennai600 036 India

ISBN: (纸本)3540658211

The problem of optimal compile-time multiprocessor scheduling of iterative data-flow programs with feedback (delay elements) is addressed in this paper, unlike the earlier studies assumed the availability of a large number of processors and complete interconnection among them along with the interprocessor communication (IPC) to be non-negligible to be more realistic. We first explain the effects of including IPC in non-overlapped, overlapped, fully-static, and cyclo-static multiprocessor schedules with LMS filter as a realistic example. The effect of IPC in the rate-optimal schedules with the transformation techniques viz. unfolding and retiming in scheduling data-flow programs with optimal unfolding is discussed with an example. We then propose an algorithm, based on the well-known A* algorithm, for optimal scheduling of data-flow programs onto multiprocessors, which uses only minimum number of processors. To alleviate the impediments of large requirements of memory space and CPU time for the optimal scheduling algorithm, we present an effective technique, branch join path isomorphism (BJP) which relies on our previously defined processor isomorphism, task isomorphism, and node isomorphism apart from the lower bound theory and upper bound on the completion time. The schedules produced by our algorithm are superior to those obtained by the earlier algorithms despite considering IPC as non-negligible and also not completely connected multiprocessor systems. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Scheduling

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New object models for seamless transition across heterogeneous mobile environments

New object models for seamless transition across heterogeneo...

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International Workshop on Database and Expert systems Applications

作者： A. Pasala D. Janaki Ram Distributed & Object Systems Group Department of Computer Science and Engineering Indian Institute of Technology Chennai India

In mobile collaborative applications, collaborators may move across heterogeneous environments. This paper proposes object models for seamless transition of collaborators across heterogeneous environments. This is achieved by framing the various limitations of the environment as constraints and abstracting them into a constraint meta-object. Collaborator objects are dynamically customized by attaching the appropriate constraint meta-object based on the environment in which the collaborators are working. Remote customization of objects is achieved by 'distributed glue model'.

关键词： Collaborative work Collaboration Mobile computing computer science Application software Joining processes Wireless communication Physics computing Wireless networks Error analysis

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The prototype of continuous media file system, CrownFS

The prototype of continuous media file system, CrownFS

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International Conference on Information Networking

作者： Se-Jin Hwang Jin-Uok Kim Myong-Soon Park Oh-Young Kwon Tae-Geun Kim Computer Systems Laboratory Computer Science Department Korea University Seoul South Korea Distributed Computing Laboratory Network Computing Department Systems Engineering Research Institute Daejeon South Korea

ISBN: (纸本)0818672250

Currently, many multimedia or continuous media server system is under development on top of either workstations or high-end PCs clustered with high speed networking facilities. In this paper we introduce Crown, a continuous media server on clustered high performance PCs with Myrinet, fast network switching equipment, and then address CrownFS, a file system on top of Crown, to offer continuous media streams to many subscribers at the same time. For easy and rapid tuning of the performance of CrownFS, we prototyped it. Prototyping requires less efforts and costs than direct implementation. Also, more reliable system optimization is obtainable rather than simulation. By using the prototype, we measured the scalability of CrownFS according to disk access strategies.

关键词： Prototypes File systems Streaming media Network servers Personal communication networks Multimedia systems Workstations High-speed networks File servers Costs

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Constraint meta-object: A new object model for distributed collaborative designing

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IEEE TRANSACTIONS ON systems MAN AND CYBERNETICS PART A-systems AND HUMANS 1997年第2期27卷 208-221页

作者： Ram, DJ Vivekananda, N Rao, CS Mohan, NK Distributed and Object Systems Group Department of Computer Science and Engineering Indian Institute of Technology Chennai India

Object databases have been recognized as providing rich data modeling capabilities for the next generation applications, especially CAD/CAM, software engineering, and multimedia, The core object model consisting of objects, messages and inheritance, however, is not adequate to tackle all the requirements of these applications, Since collaborative activity is one of the key features of next-generation applications, it is essential that the basic object model be extended to support collaborative activity, We propose an object model for collaborative designing based on objects and constraint meta-objects. Each design object has an associated constraint space consisting of one or more constraint meta objects. The object/constraint meta-object separation achieves a clear distinction between design object and its associated design environment and provides a framework for supporting collaboration among members of a design team, Collaboration is modeled as dependencies among multiple constraint spaces on different nodes, and collaborative activity as design transactions satisfying local constraints and propagating constraints among interrelated constraint spaces, We propose language extensions to C++ for capturing the object/constraint meta-object paradigm. The extensions are implemented using filters, a special mechanism for capturing messages sent to an object, Our model has been applied to the case of a mechanical CAD problem.

关键词： collaborative designing computer-aided design (CAD) computer-supported collaborative work (CSCW) constraint meta-object distributed object databases

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