16557699
Disconnected Operation Service in Mobile Grid Computing
In this paper, we discuss on the extension of grid computing systems in mobile computing environments, where mobile devices can be effectively incorporated into the grid either as service recipients or as more valuable service providers. First, based on the present grid architecture, we try to figure out what would be the newly required services in such a mobile/grid integrated architecture. There are a number of challenging issues when taking mobile environment into account, such as intermittent connectivity, device heterogeneity, and weak security. Among these issues to solve, we particularly focus on a disconnected operation problem in this paper since mobile resources are prone to frequent disconnections due to their confined communication range and device mobility. We develop a new job scheduling algorithm for mobile grid system and evaluate it by various methods such as mathematical analysis, simulation, and prototype implementation.
9375021
Dynamic Data Grid Replication Strategy Based on Internet Hierarchy
In data grid, large quantity of data files is produced and data replication is applied to reduce data access time. Efficiently utilizing grid resources becomes important research issue since available resources in grid are limited while large number of workloads and large size of data files are produced. Dynamic replication in data grid aims to reduce data access time and to utilize network and storage resources efficiently. This paper proposes a novel dynamic replication strategy, called BHR, which reduces data access time by avoiding network congestions in a data grid network. With BHR strategy, we can take benefits from ‘network-level locality’ which represents that required file is located in the site which has broad bandwidth to the site of job execution. We evaluate BHR strategy by implementing it in an OptorSim, a data grid simulator initially developed by European Data Grid Projects. The simulation results show that BHR strategy can outperform other optimization techniques in terms of data access time when hierarchy of bandwidth appears in Internet. BHR extends current site-level replica optimization study to the network-level.
816246
Alternative Software Stacks for OGSA-based Grids
The Open Grid Services Architecture (OGSA) has been a major step forward for Grid Computing, but its de facto reliance on the Web Services Resource Framework (WSRF) and WS-Notification have left some in the community questioning if the Grid software and protocols have become too complex. In this paper, we consider the feasibility of an "alternative" software stack, based on WS-Transfer and WS-Eventing. We compare and evaluate WSRF/WS-Notification vs. WS-Transfer/WSEventing, first via a "hello world" service and then via a more complete Grid scenario for remote execution called "Grid-in-a-Box". By qualitatively and quantitatively evaluating each approach, we find that while subtle differences exist (e.g., the naming of resources, the creation of resources), the stacks are overwhelmingly equivalent in their functionality and implied performance. Overall, this paper uniquely shows that there could be alternative software stacks for OGSA-based Grids.
42030145
Rutgers Interactive Track at TREC-5
The Interactive Track investigation at Rutgers concentrated primarily on three factors: the searchers' uses and understandings of relevance feedback and ranked output, and the utility of relevance feedback for the interactive track task; the searchers' understandings of the interactive track task; and performance differences based on topic characteristics and searcher and order effects. Our official results are for twelve searchers, each of whom did searches on six different topics
195882533
Energy efficiency and fairness tradeoffs in multi-resource, multi-tasking embedded systems
This paper presents techniques for optimizing the energy efficiency of multi-resource, multi-tasking embedded systems. Low power design of individual system resources, such as embedded processors, has been extensively studied in the past. However, system-level techniques, such as those presented in this paper, which exploit the synergy between various system resources, achieve levels of energy efficiency that cannot be obtained by considering individual resources independently. We demonstrate that, in multi-resource embedded systems that concurrently execute multiple applications, there exists a tradeoff between resource management efficiency and resource allocation fairness. By solving the multi-resource energy optimization problem in the context of an embedded sensor system, we show that our techniques enable the system designer to traverse this efficiency-fairness tradeoff space.
20757485
Rigorous Modeling of Disk Performance for Real-Time Applications
Performance modeling of magnetic disks allows the prediction of the disk service time which is useful for on-line decision support for soft real-time applications. In this paper, we propose a new performance model of disk access time to estimate the bounded disk service time. Our proposed model focuses on modeling the head positioning time to fully utilize the disk I/O bandwidth by exploiting the geometric layout of the disk. The experimental results show that our proposed model can estimate the disk service time with less than 10% error on average.
5736489
Architecture for Implementing the Mobile Government Services in Korea
Each nation’s architecture for the m-Government including Korea’s is being laid out somewhat differently according to its strategy, approach, and its own structural conditions and challenges. Despite such differences, all of them are making numerous efforts to establish the advanced service architecture for the m-Government. In the meantime, they are confused in securing and managing strategic resources which are needed to create constant mobile values, diversifying wired and wireless connection sections, and dealing with technological complexities and differences in various kinds of mobile technologies. Therefore, this study proposes the m-Government service architecture, which can effectively provide nationwide m-Governmental services. It also defines key components of the m-Government service architecture and specific characteristics of applied technologies.
3150650
Fault-Tolerant All-to-All Broadcasting in Hypercubes