The use of Java for parallel programming on clusters relies on the need of efficient communication middleware and high-speed cluster interconnect support. Nevertheless, currently there are no solutions that fully fulf...
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This paper presents a technique for high-level power estimation of microprocessors. The technique, which is based on abstract execution profiles called 'event signatures', operates at a higher level of abstrac...
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This paper presents a technique for high-level power estimation of microprocessors. The technique, which is based on abstract execution profiles called 'event signatures', operates at a higher level of abstraction than commonly-used instruction-level power simulators and should thus be capable of achieving good evaluation performance. We have compared our power estimation results to those from the instruction-level simulator Wattch. In these experiments, we demonstrate that with a good underlying power model, the signature-based power modeling technique can yield accurate estimations (a mean error of 5.5 percent compared to Wattch in our experiments). At the same time, the power estimations based on our event signature technique are at least an order of magnitude faster than with Wattch.
In this work, the necessity of combining signal encoding schemes with low-level anti-crosstalk techniques like spacing and shielding is analyzed. It is shown that in order to increase the throughput improvement and/or...
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Current Web services are able to interoperate successfully with most basic data types. However, due to the limited functionality of existing data binding tools, they still experiment difficulties manipulating more com...
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Current Web services are able to interoperate successfully with most basic data types. However, due to the limited functionality of existing data binding tools, they still experiment difficulties manipulating more complex XML data types, forcing programmers to work at the XML level. In this paper we propose a business model for web services where data binding tools not only generate the WSDL, but also provide portable binding extensions for manipulating theXSD types. These binding extensions can be integrated into any other binding tool, overcoming their limitations. Because these extensions are written in XML, this model conforms to the principle of platform independence. In addition, this model does not suppose any extra programming effort to neither service providers or clients. The approach has been validated with the creation of several extensions, which has been ported into Java and PHP clients. Our preliminary results show no performance penalty.
In today's world of pervasive computing, the mobile devices are enriched with a variety of features and being used as a personal information delivery platform. The increased processing, storage and communication c...
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In today's world of pervasive computing, the mobile devices are enriched with a variety of features and being used as a personal information delivery platform. The increased processing, storage and communication capabilities of these devices combined with the latest developments in the area of service oriented architecture enables a new class of services, called nomadic mobile services (NMS). Recent research has resulted in different NMS provisioning approaches; each one employs/defines a different architecture and addresses a different mix of issues. This paper provides a comparative study of three NMS provisioning approaches based on their architectural design, development choices and prototyped applications. Each approach has its own merits considering the applications they aim at. However, in the future, a solution which uses Web services for better interoperability and employs proxy approach for better QoS could be a possible technical design.
For embedded systems as well as for biological cell systems, design is a feature that defines their identity. The assembly of different components in designs of both systems can vary widely. Given the similarities bet...
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For embedded systems as well as for biological cell systems, design is a feature that defines their identity. The assembly of different components in designs of both systems can vary widely. Given the similarities between computers and cellular systems, methods and models of computation from the domain of computersystems engineering might be applied to modeling cellular systems. Our aim is to construct a framework that focuses on understanding the design options and consequences within a cell, taking an in silico (forward-) engineering approach rather than a reverse engineering approach that is used in this domain as a default now. We take our ideas from the domain of embedded computersystems. The most important features of our approach, as taken from this domain, are a variable abstraction level of components that allows for addition of components when detailed information is lacking, and a separation of concerns between function and performance by components in the design. This allows for efficient and flexible modeling. Also, there is a strict separation between computation within- and communication between components, reducing complexity. As a proof of principle, we show that we can make a statement regarding the design of the gene expression machinery of the cell to produce a protein, using such a method
Now that the Internet and Web are abundantly present in every days live and net-working and computing speed are improving at an impressive rate, more and more attempts become visible to apply these developments toward...
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Several routing protocols for IEEE 802.11 mesh networks that operate at multiple RF channels have been described before [1][2][3]. However, only few facts about link-level characteristics in multi-channel environments...
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ISBN:
(纸本)1595933069
Several routing protocols for IEEE 802.11 mesh networks that operate at multiple RF channels have been described before [1][2][3]. However, only few facts about link-level characteristics in multi-channel environments have been published. This paper presents observations, made in an indoor testbed, about the impact of channel-assignment on the quality of links. We argue that the assumption 'all radio channels are equal' does not hold in almost all indoor scenarios. Hence, great care must be taken when assigning radio channels to individual links, in order not to spoil network performance. We found that for any given environment the quality and symmetry of a wireless link (quantified by delivery probability) varies significantly depending on the radio channel used. The delivery probability between the best and the worst case could easily exceed a factor of two. However, existing IEEE 802.11 multi-channel protocols assume that all channels are equal, which does not reflect real-world conditions. To remedy to this shortcoming we present the Multi Channel Extremely Opportunistic Routing MCExOR protocol [3]. Copyright 2006 ACM.
The aim of this work is to improve load balance of the MPI parallel version of the STEM-II air quality model. Several dynamic data distributions are proposed and evaluated on different systems: homogeneous and dedicat...
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Web Service technologies offer a successful way for interoperability among applications. However, although current approaches are beginning to address how to specify non-functional capabilities in Web Services at desc...
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