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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2672卷 103-122页

作者： Fiege, Ludger Gärtner, Felix C. Kasten, Oliver Zeidler, Andreas Department of Computer Science Databases Distributed System Group D-64283 Darmstadt Germany School of Computer and Communication Sciences Distributed Programming Laboratory CH-1015 Lausanne Switzerland Department of Computer Science Distributed Systems Group CH-8092 Zurich Switzerland

Publish/subscribe (pub/sub) is considered a valuable middleware architecture that proliferates loose coupling and leverages reconfigurability and evolution. Up to now, existing pub/sub middleware was optimized for static systems where users as well as the underlying system structure were rather fixed. We study the question whether existing pub/sub middleware can be extended to support mobile and location-dependent applications. We first analyze the requirements of such applications and distinguish two orthogonal forms of mobility the system-centric physical mobility and an application-centric logical mobility (where users are aware that they are changing location). We introduce location-dependent subscriptions as a suitable means to exploit the power of the event-based paradigm in mobile applications. Briefly spoken, location-dependency refines a subscription to accept only events related to a mobile user's current location. Implementations for both forms of mobility are presented within the content-based pub/sub middleware REBECA, drawing from its refined routing capabilities (namely, covering and merging). © IFIP International Federation for Information Processing 2003.

关键词： Location

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Unified service level monitoring using CIM

Unified service level monitoring using CIM

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International Conference on Enterprise distributed Object Computing (EDOC)

作者： M. Debusmann M. Schmidt M. Schmid R. Kroeger Department of Computer Science Distributed Systems Laboratory University of Applied Sciences Fachhochschule Wiesbaden Wiesbaden Germany

This paper contributes to service level management of complex Web-based e-business environments using WBEM/CIM. Such e-business environments usually consist of Web servers and Web containers to realize client access, and EJB containers or CORBA components for modeling the application business logic. Since the DMTF does not define a model providing a unified view upon such complex environments, the definition of a management information model is the core part of the work presented. Currently, the information model mainly focuses on performance aspects, like application response times, which are integral part of many SLAs. The paper also presents a framework that was developed to efficiently implement the information model. The framework increases the portability of CIM providers, which are responsible for retrieving management information, between different CIMOMs by providing an abstraction layer. In addition, the framework simplifies the development of providers by offering support for caching etc.

关键词： computer integrated manufacturing Application software Containers Delay Power system management Logic Information management Power system modeling computerized monitoring Environmental management

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G-monitor: a web portal for monitoring and steering application execution on global grids

G-monitor: a web portal for monitoring and steering applicat...

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International Workshop on Challenges of Large Applications in distributed Environments

作者： M. Placek R. Buyya Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

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The tangible file system

The tangible file system

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International Conference on distributed Computing systems Workshop

作者： A. Karypidis S. Lalis Distributed Systems Laboratory Foundation for Research & Technology Hellas Institute for Computer Science Greece Department of Computer and Communication Engineering University of Thessally Greece

The "tangible file system"/sup 1/ is a document management and access infrastructure for the ubiquitous computing era. It provides a transparent user interface which takes advantage of physical user actions for the purpose of directory management, data sharing and document location tracking. This is achieved by digitally augmenting both documents and document containers to detect the location of physical information and to trigger corresponding update actions in the electronic world. The system is built using the Datlet [9] architecture to allow any 'tool-objects' to be applied to 'data-objects', thereby enabling an even more natural user interaction based on affordances.

关键词： File systems Pervasive computing Ubiquitous computing User interfaces distributed computing Physics computing Laboratories computer science Technology management Engineering management

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An active traffic splitter architecture for intrusion detection

An active traffic splitter architecture for intrusion detect...

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International Symposium on Modeling, Analysis and Simulation of computer and Telecommunication systems (MASCOTS)

作者： I. Charitakis K. Anagnostakis E. Markatos Institute of Computer Science Foundation for Research and Technology Hellas Greece Distributed Systems Laboratory CIS Department University of Pennsylvania Phila PA USA

Scaling network intrusion detection to high network speeds can be achieved using multiple sensors operating in parallel coupled with a suitable load balancing traffic splitter. This paper examines a splitter architecture that incorporates two methods for improving system performance: the first is the use of early filtering where a portion of the packets is processed on the splitter instead of the sensors. The second is the use of locality buffering, where the splitter reorders packets in a way that improves memory access locality on the sensors. Our experiments suggest that early filtering reduces the number of packets to be processed by 32%, giving a 8% increase in sensor performance, while locality buffers improve sensor performance by about 10%. Combined together, the two methods result in an overall improvement of 20% while the performance of the slowest sensor is improved by 14%.

关键词： Intrusion detection Filtering Telecommunication traffic Sensor systems computer architecture Traffic control computer science Laboratories Computational Intelligence Society Load management

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Optimal partition of QoS requirements for many-to-many connections

Optimal partition of QoS requirements for many-to-many conne...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： D.H. Lorenz A. Orda D. Raz Distributed Computer Systems IBM Haifa Research Laboratory Haifa Israel Department of Electrical Engineering Technion-Israel Institute of Technology Haifa Israel Department of Computer Science Technion-Israel Institute of Technology Haifa Israel

The problems related to supporting multicast connections with quality of service (QoS) requirements are studied. We investigate the problem of optimal resource allocation in the context of performance dependent costs. In this context each network element can offer several QoS guarantees, each associated with a different cost. This is a natural extension to the commonly used bi-criteria model, where each link is associated with a single delay and a single cost. This framework is simple yet strong enough to model many practical interesting networking problems. The fundamental multicast resource allocation problem under this framework is how to optimally allocate QoS requirements on the links of the multicast tree. One needs to partition the end-to-end QoS requirement along the various paths in a tree. The goal is to satisfy the end-to-end QoS requirement with minimum cost. Previous studies under this framework considered single-source multicast connections, where the end-to-end QoS requirement is specified from the source to all other multicast group members. In this paper we extend these results to the more general, and considerably harder case of multicast sessions, where the end-to-end requirement hold for every path between any two multicast group members. Our aim is to provide rigorous solutions, with proven performance guarantees, by way of algorithmic analysis. The problem under investigation is NP hard for general cost functions, thus we first present a pseudopolynomial exact solution. From this solution we derive two efficient /spl epsi/-approximate solutions. One achieves optimal cost, but may violate the end-to-end delay requirement by a factor of (1 + /spl epsi/), and the other strictly obeys the bounds and achieves a cost within a factor of (1+/spl epsi/) of the optimum. Furthermore, we present improved results for discrete cost functions, and give a simple linear-time exact polynomial solution for a specific, and practically interesting, family of convex

关键词： Quality of service Delay Cost function Resource management Call conference distributed computing computer science Multicast algorithms Performance analysis Algorithm design and analysis

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A risk-free multiversion temporally correct algorithm

A risk-free multiversion temporally correct algorithm

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International Symposium on parallel and distributed Processing (IPDPS)

作者： A. Boukerche T. Tuck Department of Computer Sciences Parallel Simulation and Distributed Systems (PARADISE) Research Laboratory University of North Texas USA

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Sequential and distributed Model Checking of Petri Net Specifications

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Electronic Notes in Theoretical computer science 2002年第4期68卷 539-558页

作者： Alexander Bell Boudewijn R. Haverkort Department of Computer Science Laboratory for Performance Evaluation and Distributed Systems RWTH Aachen D-52056 Aachen Germany

In this paper we present algorithms for model checking CTL over systems specified as Petri nets. We present sequential as well as distributed model checking algorithms. The algorithms rely on an explicit representation of the system state space, but do not require the transition relation to be explicitly available; it is recomputed whenever required. This approach allows us to model check very large systems, with hundreds of millions of states, in a fast and efficient way. Furthermore, our distributed algorithms scale very well, as they show efficiencies in the range of 80 to 100%.

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Adaptive admission control of multimedia traffic in high-speed networks

Adaptive admission control of multimedia traffic in high-spe...

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IEEE International Symposium on Intelligent Control (ISIC)

作者： S. Jagannathan A. Tohmaz A. Chronopoulos H.G. Cheung Embedded Systems and Networking Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA Parallel and Distributed Systems Lab Department of Computer Science University of Texas-San Antonio TX USA

This paper proposes a novel real-time adaptive admission control (AAC) scheme with a desired quality of service (QoS) guarantee and high network utilization in high speed networks. The QoS is given in terms of service delay, which is defined as the time it takes for a source to get admitted into the network after it initiates its intended request, packet/cell losses, and transmission delay (time taken to complete transmission from its initiation). AAC uses the following information - the available capacity from a novel adaptive bandwidth estimation scheme, a congestion indicator derived from a congestion controller, peak cell rate estimate from new sources, along with the desired QoS metrics, and outputs an 'admit' or 'reject' decision signal to the new sources while guaranteeing QoS and network utilization. Simulation results are presented by streaming ON/OFF and video data into the network. Results show that the proposed AAC admits significantly more traffic compared to other available admission control schemes thereby guaranteeing high network utilization while maintaining the desired QoS.

关键词： Programmable control Adaptive control Admission control Communication system traffic control High-speed networks Quality of service Delay effects Propagation losses Bandwidth Streaming media

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Measuring end-to-end performance of CORBA applications using a generic instrumentation approach

Measuring end-to-end performance of CORBA applications using...

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IEEE Symposium on computers and Communications (ISCC)

作者： M. Debusmann M. Schmid R. Kroeger Department of Computer Science Distributed Systems Laboratory University of Applied Sciences Wiesbaden Germany

The Common Object Request Broker Architecture (CORBA) is often used as backbone middleware for connecting critical business system components and for integrating legacy systems. Therefore, CORBA applications have to be managed in an efficient manner. The emerging trend of service level agreements and service level management requires the management of a system from an end-user's viewpoint, i.e., metrics like application response time and availability are key concerns. This requires a very fine-grained monitoring of the application in order to identify its performance-critical parts. This paper presents a new generic instrumentation approach for CORBA applications that enables the measurement of end-to-end performance characteristics. The measurements are very fine-grained, i.e., complex invocation hierarchies within object meshes can be monitored. The presented solution is based on portable interceptors and the application response measurement (ARM).

关键词： Instruments Application software Middleware Delay Environmental management Monitoring computer architecture Spine Hardware computer science

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