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6th ieee international Workshop on distributed Simulation and real-time Applications (DS-RT 2002)

作者： Pullen, JM Simon, R Khunboa, C Parupalli, M Brutzman, D George Mason Univ Dept Comp Sci Fairfax VA 22030 USA

ISBN: (纸本)0769518532

this paper reports on development of a Web-based capability for distributed simulation in large-scale virtual environments that has been developed collaboratively by the Naval Postgraduate School and George Mason University. the work brings together several years of effort in DIS-Java-VRML and the Virtual reality Transfer Protocol on the part of NPS with a similar period of effort by GMU in Selectively Reliable Multicast for distributed virtual simulation combined with Java-based middleware for use with the DoD High Level Architecture (HLA) for modeling and simulation. We describe the capability we have created for simulations of military and other highly interactive, physics-based models to operate in three-dimensional visualization over advanced Internet facilities. the major components of our system are described in detail, with the intent of creating interest in their use by the academic community.

关键词： Computational modeling Internet IP networks Java Large-scale systems Multicast protocols Virtual environment Virtual reality Visualization Voltage control

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Aspect-oriented programing techniques to support distribution, fault tolerance, and load balancing in the CORBA LCcomponent model

Aspect-oriented programing techniques to support distributio...

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6th ieee international symposium on Network computing and Applications

作者： Sevilla, Diego Garcia, Jose M. Gomez, Antonio Univ Murcia Comp Engn E-30071 Murcia Spain Univ Murcia Informat & Commun Engn E-30071 Murcia Spain

ISBN: (纸本)9780769529226

the design and implementation of distributed High Performance computing (HPC) applications is becoming harder as the scale and number of distributed resources and application is growing. Programming abstractions, libraries and frameworks are needed to better overcome that complexity. Moreover when Quality of Service (QoS) requirements such as load balancing, efficient resource usage and fault tolerance have to be met, the resulting code is harder to develop, maintain, and reuse, as the code for providing the QoS requirements gets normally mixed with the functionality code. Component Technology, on the other hand, allows a better modularity and reusability of applications and even a better support for the development of distributed applications, as those applications can be partitioned in terms of components installed and running (deployed) in the different hosts participating in the system. Components also have requirements in forms of the aforementioned non-junctional aspects. In our approach, the code for ensuring these aspects can be automatically generated based on the requirements stated by components and applications, thus leveraging the component implementer of having to deal with these non-functional aspects. In this paper we present the characteristics and the convenience of the generated code for dealing with load balancing, distribution, and fault-tolerance aspects in the context of CORBA-LC. CORBA-LC is a lightweight distributed reflective component model based on CORBA that imposes a peer network model in which the whole network acts as a repository for managing and assigning the whole set of resources: components, CPU cycles, memory, etc.

关键词： Common object request broker architecture (CORBA)

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Network Bandwidth Predictor (NBP): A system for online network performance forecasting 06

Network Bandwidth Predictor (NBP): A system for online netwo...

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6th ieee international symposium on Cluster computing and the Grid (CCGRID 2006)

作者： Eswaradass, Alaknantha Sun, Xian-He Wu, Ming IIT Dept Comp Sci Chicago IL 60616 USA

ISBN: (纸本)0769525857

the applicability of network-based computing depends on the availability of the underlying network bandwidth. However, network resources are shared and the available network bandwidth varies with time. there is no satisfactory solution available for network performance predictions. In this research, we propose, design, and implement the NBP (Network Bandwidth Predictor) for rapid network performance prediction. NBP is a new system that employs a neural network based approach for network bandwidth forecasting. this system is designed to integrate with most advanced technologies. It employs the NWS (Network Weather Service) monitoring subsystem to measure the network traffic, and provides an improved, more accurate performance prediction than that of NW3, especially with applications with a network usage pattern. the NBP system has been tested on real time data collected by NWS monitoring subsystem and on trace files. Experimental results confirm that NBP has an improved prediction.

关键词： performance prediction network bandwidth artificial neural network distributed computing

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the real-time Systems Compiler: migrating event-triggered systems to time-triggered systems

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SOFTWARE-PRACTICE & EXPERIENCE 2011年第12期41卷 1491-1515页

作者： Scheler, Fabian Schroeder-Preikschat, Wolfgang Univ Erlangen Nurnberg Dept Comp Sci Distributed Syst & Operating Syst 4 Erlangen Germany

In this paper, we present a prototype of the real-time Systems Compiler (RTSC). the RTSC is a compiler-based tool that enables the migration from event-triggered to time-triggered real-time systems. this is achieved by replacing the real-time systems architecture of a given real-time system. the real-time systems architecture governs the structural properties of the white-box view of a real-time system: how are tasks attached to events and how are dependencies between different tasks implemented. the RTSC uses an abstraction called Atomic Basic Blocks (ABBs) to hide the real-time systems architecture and capture all relevant dependencies of an event-triggered system in a global ABB-graph. the RTSC automatically extracts that ABB-graph from an event-triggered real-time system given as source code, transforms that ABB-graph appropriately, and maps it to a statically computed schedule that could be executed by standard time-triggered real-time operating systems. Important temporal properties of the physical environment of the real-time system needed for that transformation are stored in a system model provided as additional input to the RTSC. Furthermore, we demonstrate the applicability of our approach and the operation of our prototype by transforming an event-triggered control application into a time-triggered equivalent. Copyright (C) 2011 John Wiley & Sons, Ltd.

关键词： real-time systems time-triggered systems event-triggered systems

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Research of context situation awareness technology

Research of context situation awareness technology

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作者： Shi, Dianxi Wu, Zhendong Ding, Bo Yan, Huining National Key Laboratory for Parallel and Distributed Processing School of Computer Science National University of Defense Technology Changsha 410073 China

ISBN: (纸本)9780769546698

Context situation, which means a snapshot of the status of the real world, is formed by integrating a large amount of contexts collected from various resources. How to get the context situation and use the situation to provide better services is a challenging issue. In this paper, we focused on this challenge on the basis of the mobile cloud computing architecture. An abstract model is proposed in this paper to uniformly collect the context and send them to cloud. A rule-based large-scale context aggregation algorithm is also proposed which utilizes the MapReduce computing paradigm. Finally, a large-scale context management framework based on the abstract model and the context aggregation algorithm is proposed, and a real-time traffic demo is implemented to verify the validity of the framework. © 2012 ieee.

关键词： MapReduce

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Design space exploration of object caches with cross-profiling

Design space exploration of object caches with cross-profili...

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作者： Schoeberl, Martin Binder, Walter Villazón, Alex Department of Informatics and Mathematical Modeling Technical University of Denmark Denmark Faculty of Informatics University of Lugano Switzerland Universidad Privada Boliviana Bolivia

ISBN: (纸本)9780769543680

To avoid data cache trashing between heap-allocated data and other data areas, a distinct object cache has been proposed for embedded real-time Java processors. this object cache uses high associativity in order to statically track different object pointers for worst-case execution-time analysis. However, before implementing such an object cache, an empirical analysis of different organization forms is needed. We use a cross-profiling technique based on aspect-oriented programming in order to evaluate different object cache organizations with standard Java benchmarks. From the evaluation we conclude that field access exhibits some temporal locality, but almost no spatial locality. therefore, filling long cache lines on a miss just introduces a high miss penalty without increasing the hit rate enough to make up for the increased miss penalty. For an object cache, it is more efficient to fill individual words within the cache line on a miss. © 2011 ieee.

关键词： Aspect oriented programming

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"MatchMaker" - Synchronising objects in replicated software-architectures 6

"MatchMaker" - Synchronising objects in replicated software-...

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6th international Workshop on Groupware (CRIWG 2000)

作者： Tewissen, F Baloian, N Hoppe, U Reimberg, E Univ Duisburg Gesamthsch D-4100 Duisburg Germany

ISBN: (纸本)0769508286

In this paper, we present an approach and an existing implementation to support the object-wise synchronisation of general software entities. the software toolkit "MatchMaker" allows for synchronising already existing software applications by plugging in transparent event listener mechanisms that distribute information via a central server to other remote applications. Based on the original approach that has been presented in 1995, the current implementation of "MatchMaker" serves as the communication basis in real world applications of three computer-integrated classrooms in Europe. Current developments are oriented rewards the integration of promising technologies in the field of distributed computing. the main goal of "MatchMaker" is the provision of powerful yet easy applicable high-level API for synchronising distributed objects.

关键词： Application software Collaborative software Collaborative work Computer applications distributed computing Java Problem-solving Software libraries Software tools User interfaces

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Proceedings - ieee international symposium on distributed Simulation and real-time Applications, DS-RT

Proceedings - IEEE International Symposium on Distributed Si...

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6th ieee international Workshop on distributed Simulation and real-time Applications, DS-RT 2002

ISBN: (纸本)0769518532

the proceedings contain 20 papers. the topics discussed include: a load management system for running HLA-based distributed simulations over the grid;PERFOSIM: a performance evaluation tool for HLA distributed simulations;bridging the HLA: problems and solutions;a next-generation internet federation object model for the HLA;automatic construction of hierarchical federations architecture;trade-offs in overhead vs. effectiveness of causality inconsistency tracking for preemptive rollback in optimistic simulation;performance evaluation of real time schedulers for a multicomputer;performance trade-off in distributed simulation;using a software architecture description language to model the architecture and run-time performance of a federate;and software design for implementation of the selectively reliable multicast protocol.

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object recognition using image segmentation 6

Object recognition using image segmentation

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6th international Conference on Parallel, distributed and Grid computing, PDGC 2020

作者： Chaturvedi, Manish Kaur, Mandeep Rakesh, Nitin Nand, Parma Sharda University Department of Computer Science and Engineering Greater Noida India

ISBN: (纸本)9781728171326

the aim of the paper is to develop a system that can recognize various targeted objects in real-time by incorporating some computer vision techniques and advanced boosted Machine Learning algorithms to solve the problem of object recognition with high accuracy. the task of object detection is a combination of both, image classification and image localization. Image classification identifies the class of target object whereas localization identifies its position inside the input image. Viola-Jones is an algorithm that can work effectively for recognizing a large number of categories such as airplanes, cars, faces, etc. It works on feature extraction and uses Haar-Like features to achieve the objective. So, Viola-J ones is the algorithm that will be used for the development purpose of this paper. Also, instead of using a normal image, the image segmentation technique will be used to create segments in the image that will make it easy to analyze and process the image for further computations. © 2020 ieee.

关键词： Adaptive boosting

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Evaluating policies and mechanisms for supporting embedded, real-time applications with CORBA 3.0

Evaluating policies and mechanisms for supporting embedded, ...

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6th ieee real-time Technology and Applications symposium (RTAS 2000)

作者： O'Ryan, C Schmidt, DC Kuhns, F Spivak, M Parsons, J Pyarali, I Levine, DL Univ Calif Irvine Dept Elect & Comp Engn Irvine CA 92697 USA

ISBN: (纸本)0769507131

To be an effective platform for performance-sensitive real-time systems, commercial-off-the-shelf(COTS) distributed object computing (DOC) middleware must support application quality of service (QoS) requirements end-to-end. However conventional DOC middleware does not provide this support, which makes it unsuited for applications, with stringent latency, determinism, and priority preservation requirements. It is essential, therefore, to develop standards-based, COTS DOC middleware that permits the specification allocation, and enforcement of application QoS requirements end-to-end. the real-time CORBA and Messaging specifications in the forthcoming CORBA 3.0 standard are important steps towards defining standards-based, COTS DOC middleware that can deliver end-to-end QoS support at multiple levels in distributed and embedded real-rime systems. However these specifications still lack sufficient detail to portably configure and control processor;communication, and memory resources for applications with stringent QoS requirements. this paper provides four contributions to research err realtime DOC middleware. First, we illustrate how the CORBA 3.0 real-time and Messaging specifications provide a starting point for addressing the needs of an important class of applications with stringent real-time requirements. Second, we illustrate how the CORBA 3.0 specifications are not sufficient to solve all the issues within this application domain. third, we describe how we have implemented portions of these specifications, as well as several enhancements, using TAO, which is our open-source real-time CORBA ORB. Finally we empirically evaluate the performance of TAO to illustrate how its features address the QoS requirements of certain types of realtime applications.

关键词： real-time CORBA patterns and frameworks distributed and real-time middleware

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