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2005 AAAI Fall Symposium

作者： Chandra Sekharaiah, Kangaluru Janaki Ram, D. Distributed Object Systems Group Department of Computer Science and Engg. JNTU College of Engineering Hyderabad India Distributed Object Systems Lab. Department of Computer Science and Engg. Indian Institute of Technology Madras

ISBN: (纸本)1577352548

A role paradigm conformance model (RPCM) called Typehole model was developed and implemented in Java. It does not use Is-role-of inheritance and is free from the object schizophrenia (OS) problem (OSP). An extended distributed role model provides multifarious role hierarchies at different sites. Modeling object role systems is prone to OSP. OSP is the error in the RPCM design to subscribe to the viewpoints in the client space. OS and OSP are contrasted. A classification of OSPs is made. Role modeling problem is the requirement to design an OSP-free RPCM with Is-role-of inheritance. The existing object-oriented role models have been evaluated as regards OSP. No role model has strong claims as regards solving the role modeling problem. A security model was developed for RPCM-based distributed object systems and implemented on CORBA. By designing message filter hierarchies, hybrid security is developed at global and local levels for RPCM-based object systems. Role is either abstract or concrete as it can be a type or an instance. Copyright © 2005, American Association for Artificial Intelligence (***). All rights reserved.

关键词： Database systems

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Best-effort versus reservations revisited

Best-effort versus reservations revisited

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13th International Workshop on Qualityof Service - IWQoS 2005

作者： Heckmann, Oliver Schmitt, Jens B. KOM Multimedia Communications Lab. TU Darmstadt Germany DISCO Distributed Computer Systems Lab. University of Kaiserslautern Germany

In this paper, we walk in the footsteps of the stimulating paper by Lee Breslau and Scott Shenker entitled "Best-effort vs. Reservations: A Simple Comparative Analysis"[1]. In fact, we finally follow their invitation to use their models as a starting point and extend them to reason about the very basic but still very much debated architectural issue whether quality of service (QoS) mechanisms like admission control and service differentiation are necessary or if overprovisioning with a single service class does the job just as well at lower system complexity. We analytically compare two QoS systems: a QoS system using admission control and a reservation mechanism that can guarantee bandwidth for flows respectively offers service differentiation based on priority queueing for two service classes and a system with no admission control and a single best-effort service class. © IFIP International Federation for Information Processing 2005.

关键词： Quality of service

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Surrogate Object Model: A New Paradigm for distributed Mobile systems 4

Surrogate Object Model: A New Paradigm for Distributed Mobil...

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4th International Conference on Information systems Technology and its Applications, ISTA 2005

作者： Mohamed, M.A. Maluk Janakiram, D. Chakraborty, Mohit Distributed and Object Systems Lab Dept. of Computer Science and Engg. Indian Institute of Technology Madras India

ISBN: (纸本)388579392X

distributed mobile systems are characterized by asymmetry in both network connectivity and computing power, mobility of hosts and their constraints. To address these issues, existing approaches attempt to completely redesign distributed applications or algorithms to make them work in a distributed mobile environment. This paper proposes an alternate mechanism namely, the surrogate object model to handle the asymmetry problem in distributed mobile systems. The surrogate object is a representative for a particular Mobile Host (MH) in the wired network that maintains application specific data structures and methods. The surrogate object model maintains a cache of data stored in the mobile host and reduces wireless data transfers. The proposed novel model also provides an ideal placeholder for MH location information, thus solving the location management problem to handle mobility of hosts. A comprehensive simulation study of the surrogate object model has been done. Performance studies of a sample application with and without the surrogate object model illustrates the efficiency of developing applications over the surrogate object model. © 2005 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Location

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Ontology-driven Web services composition platform

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Information systems and e-Business Management 2005年第2期3卷 175-199页

作者： Arpinar, I. Budak Zhang, Ruoyan Aleman-Meza, Boanerges Maduko, Angela Large Scale Distributed Information Systems Lab. Computer Science Department University of Georgia Athens GA 30602-7404 United States

Discovering and composing individual Web services into more complex yet new and more useful Web processes is an important challenge. In this paper, we present three techniques for (semi) automatically composing Web services into Web processes by using their ontological descriptions and relationships to other services. In Interface-Matching Automatic composition technique, the possible compositions are obtained by checking semantic similarities between interfaces of individual services. Then these compositions are ranked considering their Quality of Services (QoS) and an optimum composition is selected. In Human-Assisted composition the user selects a service from a ranked list at certain stages. We also address automatic compositions in a Peer-to-Peer network. © Springer-Verlag Berlin 2005.

关键词： Composition Discovery Ontology Web services

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A flexible and extensible object middleware: CORBA and beyond

A flexible and extensible object middleware: CORBA and beyon...

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5th International Workshop on Software Engineering and Middleware, SEM 2005

作者： Hauck, Franz J. Kapitza, Rüdiger Reiser, Hans P. Schmied, Andreas I. Distributed Systems Lab. University of Ulm Germany Dept. of Computer Science University of Erlangen-Nürnberg Germany

This paper presents a CORBA-compliant middleware architecture that is more flexible and extensible compared to standard CORBA. The portable design of this architecture is easily integrated in any standard CORBA middleware;for this purpose, mainly the handling of object references (IORs) has to be changed. To encapsulate those changes, we introduce the concept of a generic reference manager with portable profile managers. Profile managers are pluggable and in extreme can be downloaded on demand. To illustrate the use of this approach, we present a profile manager implementation for fragmented objects and another one for bridging CORBA to the Jini world. The first profile manager supports truly distributed objects, which allow seamless integration of partitioning, scalability, fault tolerance, end-to-end quality of service, and many more implementation aspects into a distributed object without losing distribution and location transparency. The second profile manager illustrates how our architecture enables fully transparent access from CORBA applications to services on non-CORBA platforms. Copyright 2005 ACM.

关键词： Middleware

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GDP: A paradigm for intertask communication in grid computing through distributed pipes

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2nd International Conference on distributed Computing and Internet Technology, ICDCIT 2005

作者： Janakiram, D. Reddy, M. Venkateswara Srinivas, A. Vijay Mohamed, M. A. Maluk Kumar, S. Santosh Distributed and Object Systems Lab. Dept. of Computer Science and Engg. Indian Institute of Technology Madras Chennai India

ISBN: (纸本)3540309993

Existing grid models target purely data parallel applications without inter-task communication. This paper proposes a transparent programming model to support communicating parallel tasks in a wide area grid. The proposed grid model with distributed Pipes (DP) abstraction named as, GDP, enables location independent intertask communication among processes on machines spread over a wide area distributed system. This approach enables anonymous migration of communicating parallel tasks adjusting to grid dynamics. The proposed model supports sequential load to coexist with parallel load. A prototype of the proposed model has been implemented over clusters of nodes spread across the Internet. A steady state equilibrium engineering problem was studied over the model. Performance studies show linear to super linear speed up for the application. © Springer-Verlag Berlin Heidelberg 2005.

关键词： distributed computer systems

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Service Composition based middleware architecture for mobile grid

Service Composition based middleware architecture for mobile...

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作者： Maluk Mohamed, M.A. Janakiram, D. Distributed and Object Systems Lab Dept. of Computer Science and Engg Indian Institute of Technology Madras Chennai India

ISBN: (纸本)9728865244

Service Composition refers to the construction of complex services with the help of more primitive and easily executable services or components. With the proliferation of wireless communication and the mobile Internet, the demand for mobile data services has increased. In addition the recent spurt of eservices and m-services has increased the importance of service composition. We envisage service composition to play a crucial role in providing mobile devices access to complex services. The basis for our proposed approach is to virtualize the individual system resources as services that can be described, discovered and dynamically configured at runtime to execute an application. The paper discuss a novel paradigm which integrates mobile devices into the traditional grid, with the capability for composition of services. To accomplish such a global service composition in the new model we propose to add functional layers over the already proposed Anonymous Remote Mobile Cluster Computing model. The idea behind such middleware is to use the available resources efficiently and to hide the complexity inherent in managing heterogeneous services. This paper describes the unique capabilities of the proposed middleware and gives the layered view of the proposed architecture.

关键词： Middleware

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A categorization of collaborative business process modeling techniques

A categorization of collaborative business process modeling ...

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IEEE International Conference on E-Commerce Technology Workshops

作者： S. Roser B. Bauer Programming Distributed Systems Lab Institute of Computer Science University of Augsburg Germany

Business process modeling (BPM) is one of the key factors in defining service-oriented solutions for business collaborations. Like in traditional software engineering there is a need for adaptable methodologies to develop information and communication technology (ICT) systems supporting collaborative business processes. In this work we introduce a categorization for the classification of modeling languages and approaches used to model collaborative business processes. Considering an example, we show how the classification of modeling languages and approaches facilitates the development of methodologies for collaborative business processes.

关键词： Collaboration Standardization Collaborative work Application software Software engineering Collaborative software Service oriented architecture Standards organizations Standards development computer science

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M2DR: A near-optimal multiclass minimum-delay routing algorithm for smart radio access networks

M2DR: A near-optimal multiclass minimum-delay routing algori...

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IEEE Conference on Local computer Networks - 30th Anniversary, LCN 2005

作者： Hollick, Matthias Mogre, Parag S. Krop, Tronje Huth, Hans-Peter Schmitt, Jens B. Steinmetz, Ralf Department of Electrical Engineering and Information Technology Technische Universität Darmstadt Merckstrasse 25 64283 Darmstadt Germany Siemens AG Corporate Technology Department Information and Communications Munich Germany Distributed Computer Systems Lab. Computer Science Department University of Kaiserslautern Germany

ISBN: (纸本)0769524214

Today, we witness a transformation of radio access network topologies from strictly tree-structured towards meshed architectures. Yet, these edge networks follow mostly circuit-switched paradigms to support quality of service applications such as voice or video communication. In this work, we develop a novel quality of service aware routing framework to optimize the performance of edge networks in the packet-switched domain. Starting from the Internet's best-effort routing paradigm and building on related work, we formulate a near-optimal multiclass minimum-delay routing algorithm. Our algorithm optimizes network-wide end-to-end delay and allows for differentiation of service. We exploit two orthogonal dimensions namely multipath routing and class-based service prioritization. We provide a precise description of our algorithm and a detailed experimental analysis against state of the art routing algorithms. Our algorithm is able to achieve excellent performance while maintaining the simplicity of a decentralized and distributed routing algorithm, thus matching the requirements for future radio access networks. © 2005 IEEE.

关键词： Telecommunication networks

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A Simple Model for Evaluating the Scalability in Wireless Sensor Networks

A Simple Model for Evaluating the Scalability in Wireless Se...

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Intelligent Sensors, Sensor Networks and Information Processing Conference (ISSNIP)

作者： R. Venkateswarlu D. Janakiram Distributed and Object Oriented Systems Lab Department of Computer Science and Engineering IIT Madras Chennai India

Recent advances in wireless technology have enabled the rapid development of wireless sensor networks. Such networks, consisting of ten to thousands of randomly deployed nodes collaborating to achieve a goal, are used in a variety of applications. We have developed a new framework called TinyMaCLaS(tiny middleware and compositional language for sensor networks) for sensor networks that simplifies the process of developing applications. As a part of this framework, we have developed a COMiS(component oriented middleware for sensor networks). Most of the protocols and middleware argue scalability through simulations. Unfortunately, theoretical analysis does not exist for scalability. We have done theoretical analysis, in order to prove the scalability of our middleware. The paper presents the theoretical analysis, and it can be used for any middleware or protocol.

关键词： Scalability Intelligent networks Wireless sensor networks Middleware Protocols Object oriented modeling Intelligent sensors Intelligent transportation systems computer science Collaboration

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