this paper presents a prototype of a smart sound aware environment that captures ambient sounds, analyzes sound situations and gives a be-quiet reminder to someone who generates sound exceeding certain volume level an...
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this paper presents a prototype of a smart sound aware environment that captures ambient sounds, analyzes sound situations and gives a be-quiet reminder to someone who generates sound exceeding certain volume level and disturbing others in the same site. It shows the microphone net to sense sound data and the speaker net to send be-quiet reminders. All computers are interconnected with a P2P network atop of the TOMSCOP platform. It discusses how sound data is captured and processed, and when a be-quiet reminder decision is made with analyzing contexts of sounds and users in a room. Some preliminary experimental results are given
For the past years, architectures and programming models about distributed virtual shared-memory (DVSM) systems have been extensively studied. the DVSM needs communication between distributed processing nodes in order...
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Ibis' is a programming environment for the development of grid applications in Java. We aim to support a wide range of applications and parallel platforms, so our example programs should also go beyond small bench...
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ISBN:
(纸本)3540287000
Ibis' is a programming environment for the development of grid applications in Java. We aim to support a wide range of applications and parallel platforms, so our example programs should also go beyond small benchmarks, In this paper we describe a number of larger applications we have developed to evaluate Ibis' suitability for writing grid applications: a cellular automata simulator, a solver for the Satisfiability problem, and grammar-based text analysis. We give an overview of the applications, we describe their implementation, and we show performance results on a number of parallel platforms, ranging from a large supercomputer cluster to a real global grid testbed. Since all of these applications require communication between the processors during execution, it is not surprising that a supercomputer cluster proved to be the most effective platform. However, all of our applications were also efficient on a wide-area cluster system, and some of them even on a grid testbed. Since grid systems are usually only used for trivially parallel systems, we consider these results an encouraging sign that Ibis is indeed an effective environment for grid computing. In particular because for two of the three of the applications the parallelisation required very little additional program code.
the problem of computing spanning trees along with specific constraints has been studied in many forms. Most of the problem instances are NP-hard, and many approximation and stochastic algorithms which yield a single ...
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Large-scale distributed systems, such as ubiquitous computing environments, require a service delivery mechanism in order to keep track of the vast set of services offered and make them available to interested clients...
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Large-scale distributed systems, such as ubiquitous computing environments, require a service delivery mechanism in order to keep track of the vast set of services offered and make them available to interested clients. the amount of services and clients, their context, and loose coupling between them makes service delivery in ubiquitous environments different from other systems. this paper presents a solution to overcome these issues by utilizing the underlying ontology and semantics for service lookup. Access control over context data is also considered by specifying dynamic policies at the system and service level.
In this paper, we show that data content distribution can be employed to facilitate content-based multimedia retrieval in ad-hoc networks. It is challenging to perform content-based multimedia retrieval in ad hoc netw...
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In this paper, we show that data content distribution can be employed to facilitate content-based multimedia retrieval in ad-hoc networks. It is challenging to perform content-based multimedia retrieval in ad hoc networks due to the dynamic network topology. the autonomy and heterogeneity of data sources introduce additional complexity to this task. Motivated by the data organization methodology of the summary-schemas model (SSM), we proposed a logic-based content summary framework that is able to represent semantic contents of multimedia data using concise logic terms. Furthermore, we proposed a virtual infrastructure to cluster mobile nodes based on semantic contents. the proposed framework has been simulated, and the simulation results are presented and analyzed based on various performance metrics.
In this paper, we propose efficient fault-tolerant routing algorithms for 3D torus with possible large number of faulty nodes. there is no any presumption on the number and the distribution of faulty nodes. the propos...
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In this paper, we propose efficient fault-tolerant routing algorithms for 3D torus with possible large number of faulty nodes. there is no any presumption on the number and the distribution of faulty nodes. the proposed algorithms find a fault-free path between any two nonfaulty nodes with high probability in linear time by using only the local faulty information of the network. the results of our empirical analysis through simulations show that the algorithms can find a fault-free path between any two nonfaulty nodes with a probability higher than 90% in a 3D torus withthe number of faulty nodes up to 30%.
this article details a design for cheap and dependable networked RAID storage for the open source community. In this context, "networked block devices" may substitute for some of the hard disks in a RAID arr...
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this article details a design for cheap and dependable networked RAID storage for the open source community. In this context, "networked block devices" may substitute for some of the hard disks in a RAID array. Special mechanisms have been introduced for reporting, recording and recovery which together work to lower re-synchronisation transfer totals, lower latency, and in general provide an intelligent control that recognises and compensates for frequent network brown-outs, without involving the administrator or compromising the array. the practical outcome is a "fast and intelligent" open source driver drop-in for the existing Linux kernel software RAID subsystem, with further applications.
this paper presents the design principles of an advanced multicast router and evaluates its performance in experiments. Our multicast router features cluster computing, which has been used to develop a high performanc...
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this paper presents the design principles of an advanced multicast router and evaluates its performance in experiments. Our multicast router features cluster computing, which has been used to develop a high performance search engine and grid computing. the router consists of a small-scale cluster attached to a regular router. While it is not a standard router architecture, it offers high extensibility and availability without much investment. Our design is based on the new multicast technology called Flexcast by Inoue, Tani, Ishimaru, Minato and Miyazaki, (2003), which naturally supports incremental deployment of the multicast infrastructure unlike IP multicast. In Flexcast, multicast packets are replicated at each router like IP multicast. However, Flexcast is implemented in the layer above the network layer; the multicast stream is transmitted by unicast between routers that support Flexcast, and bypasses routers that do not support it. the goal of this paper is to bring the concept of incremental deployment to a multicast router as well as the protocol, by means of cluster computing. We implemented several routers on Linux PCs and tested them in experiments. the results of the experiments reveal that forwarding performance and availability are greatly enhanced by cluster computing. Our efforts provide the economy, efficiency, and extensibility needed to realize the multicast infrastructure.
this paper presents the design and implementation of a parallel two-dimensional/three-dimensional (2-D/3-D) image registration method for computer-assisted surgery. Our method exploits data and speculative parallelism...
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this paper presents the design and implementation of a parallel two-dimensional/three-dimensional (2-D/3-D) image registration method for computer-assisted surgery. Our method exploits data and speculative parallelism, aiming at making computation time short enough to carry out registration tasks during surgery. Our experiments show that exploiting both parallelisms reduces computation time on a cluster of 64 PCs from a few tens of minutes to less than a few tens of seconds
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