To date, many of existing Grid resource brokers make their decisions concerning selection of the best resources for computational jobs using basic resource parameters such as, for instance, load. This approach may oft...
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Any simulation-based evaluation of an interconnection network proposal requires a good characterization of the workload. Synthetic traffic patterns based on independent traffic sources are commonly used to measure per...
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Any simulation-based evaluation of an interconnection network proposal requires a good characterization of the workload. Synthetic traffic patterns based on independent traffic sources are commonly used to measure performance in terms of average latency and peak throughput. As they do not capture the level of self-throttling that occurs in most parallel applications, they can produce inaccurate throughput estimates at high loads. Thus, workloads that resemble the varying levels of synchronization of actual applications are needed to study the performance of interconnection networks. One approach is to use simple, burst-synchronized synthetic workloads that emulate the self-throttling of many parallel applications. To validate this approach, we compare the gains achieved by a restrictive injection mechanism under this workload with those obtained using traces from the NAS Parallel Benchmarks. This study confirms that the burst-synchronized traffic model provides reasonable performance estimates, which could be improved by taking into account dependency chains between messages.
We present novel concepts, technologies and potentials of optical data communication, especially for future computerarchitectures. The WDM (wavelength division multiplexing) and the optical wiring technologies are ex...
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There is potential for interference between IEEE 802.11 wireless local area networks (WLANs) and Bluetooth (BT) piconets as both of them are operating in the 2.4 GHz Industrial, Scientific, and Medical (ISM) radio ban...
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Various models of distance learning are being used for deaf students at post-secondary levels. The web-based distance learning that enhances classroom instruction, synchronous videoconferencing that supports staff dev...
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This paper deals with the use of parallel processing for multi-objective optimization in applications in which the objective functions, the restrictions, and hence also the solutions can change over time. These dynami...
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This paper deals with the use of parallel processing for multi-objective optimization in applications in which the objective functions, the restrictions, and hence also the solutions can change over time. These dynamic optimization problems appear in quite different real-world applications with relevant socio-economic impact. The procedure in this paper is presented based on PSFGA, a parallel evolutionary procedure for multi-objective optimization. It uses a master process that distributes the population among the processors in the system (that evolve their corresponding solutions according to an island model), and collects and adjusts the set of local Pareto fronts found by each processor (this way, the master also allows an implicit communication among islands). Moreover, the procedure exclusively uses non-dominated individuals for the selection and variation, and maintains the diversity of the approximation to the Pareto front by using a strategy based on a crowding distance.
In this paper, we present a large-scale interactive book browsing installation for children's libraries called StorySurfer. The StorySurfer prototype is developed within the Interactive Children's Library proj...
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ISBN:
(纸本)9781595937476
In this paper, we present a large-scale interactive book browsing installation for children's libraries called StorySurfer. The StorySurfer prototype is developed within the Interactive Children's Library project, which includes interests from within design, research, industry, and libraries. The objective of the project is to give room for and encourage the physical activities of children, while pursuing to connect these with the basic digital and analogue services of the library e.g. borrowing and handing in books, searching for information, and providing access to a rich variety of media. Copyright 2007 ACM.
Public spaces are changing from being ungoverned places for interaction to be more formalized, controlled, less interactive, and designed places aimed at fulfilling a purpose. Simultaneously, new personal mobile techn...
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ISBN:
(纸本)159593619X
Public spaces are changing from being ungoverned places for interaction to be more formalized, controlled, less interactive, and designed places aimed at fulfilling a purpose. Simultaneously, new personal mobile technology aims at providing private individual spaces in the public domain. In this paper we explore the implications of interacting in public space and how technology can be rethought to not only act as personal devices, but be the tool to reclaim the right and possibility to interact in public spaces. We introduce information exchange, social support and regulation as three central aspects for reclaiming public space. The PhotoSwapper application is presented as an example of a system designed to integrate pervasive technology in a public setting. The system is strongly inspired by the activities at a traditional market place. Based on the design of the application we discuss four design challenges when designing for public interaction. Copyright 2007 ACM.
This article presents a remote automatic meter reading (AMR) system as a result of the Mirakonta project, in which are involved several university investigation groups and a private company. The AMR system is composed...
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ISBN:
(纸本)1424406064
This article presents a remote automatic meter reading (AMR) system as a result of the Mirakonta project, in which are involved several university investigation groups and a private company. The AMR system is composed by reader devices and a group of elements that allow a wireless connection to a central server. The system is based on taking a picture of the fluid meter digit display, preprocessing and transmitting it to a remote element using a radio frequency ad-hoc protocol. The reader device is implemented on a FPGA based system and the firmware can be updated remotely (remote reconfiguration). In addition, the different parameters of the reader can be configured remotely. To meet the low power requirements a sleep and wake-up technique is applied. All the requirements of the system have been covered, offering a hardware-software product that covers most needs of the end users.
This paper presents the item-missing error model. It stems from the analysis of real bugs that are collected in two market-oriented projects: (1) the AMBA interface of a general-purpose microprocessor IP core; (2) a w...
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This paper presents the item-missing error model. It stems from the analysis of real bugs that are collected in two market-oriented projects: (1) the AMBA interface of a general-purpose microprocessor IP core; (2) a wireless sensor network oriented embedded processor. The bugs are analyzed via code structure comparison, and it is found that item-missing errors merit attention. The test generation method for item-missing error model is proposed. Structural information obtained from this error model is helpful to reach a greater probability of bug detection than that in random-generation verification with only functional constraints. Finally, the proposed test method is applied in verification of our designs, and experimental results demonstrate the effectiveness of this method.
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