This paper presents the design and evaluation of an adaptive, system sensitive partitioning and load balancing framework for distributed structured adaptive mesh refinement applications on heterogeneous and dynamic cl...
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This paper reports on an ongoing research project aimed at designing and deploying a COMA Commodity Grid (COG) Kit. The overall goal of this project is to explore how commodity distributed computing technologies and s...
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In order to satisfy, the complex and various demands of the customers, telecommunication networks must provide their services rapidly and flexibly, with the support of efficient service and network management systems....
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ISBN:
(纸本)0769512305
In order to satisfy, the complex and various demands of the customers, telecommunication networks must provide their services rapidly and flexibly, with the support of efficient service and network management systems. To fulfill these requirements, TINA has appeared as a concept for the advanced telecommunication system using information technology such as distributed processing, object oriented modeling. We mention some problems of developing applications in the TINA service management layer. To solve the problems, we propose the advanced architecture called OMS (object management system), which consists of three managers (data manager, data access manager and metadata registry manager). OMS separates the application layer and the middleware such as ODBC and JDBC. And the application layer and OMS are connected by distributed object middleware based on CORBA. Also in order to manage efficiently managed objects stored in different repositories, we have implemented metadata registry by using the metadata concept.
The growth of the Internet and the advent of the computational "Grid" have made it possible to develop and deploy advanced computational collaboratories. These systems build on high-end computational resourc...
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The growth of the Internet and the advent of the computational "Grid" have made it possible to develop and deploy advanced computational collaboratories. These systems build on high-end computational resources and communication technologies underlying the Grid, and provide seamless and collaborative access to particular resources, services or applications. Integrating these "focused" collaboratories presents significant challenges. Key among these is the design and development of robust middleware support that addresses scalability, service discovery, security and access control, and interaction and collaboration management for consistent access. The authors first investigate the architecture of such a middleware that enables global (Web-based) access to collaboratories. They then present the design and implementation of a middleware substrate that enables a peer-to-peer integration of and global (collaborative) access to geographically distributed instances of the DISCOVER computational collaboratory for interaction and steering.
We present the design, implementation and evaluation of a framework that uses JavaSpaces [1] to support this type of opportunistic adaptive parallel/distributed computing over networked clusters in a non-intrusive man...
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We present the design, implementation and evaluation of a framework that uses JavaSpaces [1] to support this type of opportunistic adaptive parallel/distributed computing over networked clusters in a non-intrusive manner. The framework targets applications exhibiting coarse-grained parallelism and has three key features: (1) portability across heterogeneous platforms, (2) minimal configuration overheads for participating nodes, and (3) automated system state monitoring (using SNMP) to ensure nonintrusive behavior. Experimental results presented in this paper demonstrate that for applications that can be broken into coarse-grained, relatively independent tasks, the opportunistic adaptive parallel computing framework can provide performance gains. Furthermore, the results indicate that monitoring and reacting to the current system state minimizes the intrusiveness of the framework.
This paper presents a mechanism for active resource management (ARM) in a differentiated services environment.. While the differentiated services architecture and the bandwidth broker agent provide a mechanism for QoS...
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ISBN:
(纸本)0769515282
This paper presents a mechanism for active resource management (ARM) in a differentiated services environment.. While the differentiated services architecture and the bandwidth broker agent provide a mechanism for QoS management through resource reservation, this mechanism is based on a static provisioning of resources. As bandwidth requirements are typically dynamic, such a static reservation approach can either lead to wasted bandwidth or leave applications resource-starved. The active resource management approach presented in this paper addresses this problem by dynamically, reallocating resources based on current network state and applications requirements. An implementation and evaluation of ARM using the NS-2 simulation toolkit is also presented.
Static mixed-mode presentations consisting of verbal explanations illustrated with diagrams have long been used to communicate information. With the advent of multimedia, such presentations have become dynamic, by mig...
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We have developed a new, robust clustering algorithm, Self-Splitting Competitive Learning (SSCL). It has shown great abilities in detecting not only isolated clusters, but overlapped clusters, curves and spherical she...
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We have developed a new, robust clustering algorithm, Self-Splitting Competitive Learning (SSCL). It has shown great abilities in detecting not only isolated clusters, but overlapped clusters, curves and spherical shells. We apply SSCL to quantization of color images. The clustering algorithm iteratively partitions the color space into natural clusters without a prior information on the number of clusters. The algorithm starts with only a single color prototype and adaptively splits it into multiple prototypes during the learning process based on a split validity measure. It is able to discover all natural groups; each is associated with a color prototype. The experimental results show remarkably better performance as compared to several other existing clustering algorithms.
software architectural styles that represent structural characteristics of software programs range from specific ones that can be applied to a particular domain to generic ones that can be applied to any domain. If a ...
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software architectural styles that represent structural characteristics of software programs range from specific ones that can be applied to a particular domain to generic ones that can be applied to any domain. If a specific architectural style is available for the target system to be developed, it is appropriate to apply it together with its associated modeling method. However, no quantitative evaluation on the efficiency of specific architectural styles has as yet been reported. This paper presents a quantitative comparison of two architectural styles: specific and generic software architectural styles. The comparison shows that a specific architectural style combined with its associated modeling method allows us to reduce modeling cost as much as a few scores of percent compared with the generic one combined with its modeling method. The improvement results from the characteristics that (1) a specific software architectural style requires less rewriting of modeling diagrams due to its inherent basic structure and (2) there is less redundant information among modeling diagrams.
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that c...
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ISBN:
(纸本)9781581132199
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a *** this paper we present a framework for the iterative design of interactive Hypermedia Educational Manuals, implemented in a software tool that integrates authoring and evaluation support in order to speed up iterative design cycles. Two unique features of our approach are the automatic generation of a structural description of the manual being designed and the automatic incorporation of interaction data logging elements in the manual during the authoring phase. These are then used by an evaluation tool to generate statistical analyses and graphical presentations of user interactions with the manual and redesign recommendations. Thus, the architecture of this tool embodies a tight coupling between the design of Hypermedia Educational Manuals and the evaluation of their instructional effectiveness. An experiment was carried out in which a prototype manual was created, tested with a group of students, redesigned based on analyses and recommendations provided by the evaluation tool, and then re-evaluated using data from a second group of students. This experiment showed that the integrated tool does help simplify the evaluation process and improve the efficiency of iterative design cycles.
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