Faced with the challenge of finding ways to use an evergrowing transistor budget, microarchitects have begun to move towards the chip multiprocessors (CMPs) as an attractive solution. CMPs have become a common way of ...
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ISBN:
(纸本)9781595939999
Faced with the challenge of finding ways to use an evergrowing transistor budget, microarchitects have begun to move towards the chip multiprocessors (CMPs) as an attractive solution. CMPs have become a common way of reducing chip complexity and power consumption while maintaining high performance. Multiple cores are replicated on a single chip, resulting in a potential linear scaling of performance. Cores are becoming sufficiently small with technology scaling. As technology continues to scale, inter-die and intra-die variations in process parameters can result in significant impact on performance and power consumption, leading to asymmetry among the cores that were designed to be symmetric. Adaptive voltage scaling can be used to bring all cores to the same performance level leaving only core-to-core power variations. The goal of our work is to find the optimal frequency that balances performance with power against asymmetry. We also demonstrate that traditional task scheduling techniques need to be revisited to mitigate the effects of process variations. Copyright 2008 ACM.
Past research and recent lessons learned suggest that large-scale wind farms not only have to operate in the maximum power tracking (MPT) mode to maximize capture of wind energy, they also have to be able to quickly r...
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Past research and recent lessons learned suggest that large-scale wind farms not only have to operate in the maximum power tracking (MPT) mode to maximize capture of wind energy, they also have to be able to quickly respond to system reliability and economic conditions by operating in the power regulation (PR) mode. This paper discusses several newly identified, critical issues that need to be addressed for satisfactory operation of large-scale wind farms. We first present a nonlinear controller that enables seamless operation in both the MPT and PR modes-a feature not available in existing schemes-but suffers from limited robustness. We then present the result of an empirical study on the loss of power generation in wind farms and discuss its impact on wind farm operation. Finally, we propose a controller for potentially overcoming these issues and conclude with future research directions.
With reducing feature size, the effects of process variations are becoming more and more predominant. Memory components such as on-chip caches are more susceptible to such variations because of high density and small ...
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Radio frequency identification (RFID) technology has become more sophisticated in recent years and is being developed rapidly for a variety of applications. The problem of eliminating redundant readers has been reduce...
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ISBN:
(纸本)9781424440085
Radio frequency identification (RFID) technology has become more sophisticated in recent years and is being developed rapidly for a variety of applications. The problem of eliminating redundant readers has been reduced to the minimum cover problem and proved to be NP-hard. In this paper, a density-based redundant reader elimination algorithm (DRRE) is presented; DRRE eliminates the redundant readers without influencing the number of usable tags. Simulation results demonstrate that the DRRE algorithm performed better in all instances in a variety of environments compared with other algorithms. In a densely deployed RFID network, the DRRE algorithm detected 85% more redundant readers than others.
This paper presents a torque and rotational speed estimation method for line-start induction motor operated valves. Routine inspections are carried out to those valves, because motor operated valves are used in the se...
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This paper presents a torque and rotational speed estimation method for line-start induction motor operated valves. Routine inspections are carried out to those valves, because motor operated valves are used in the serious plant such as power plant. and securing reliability is an extreme important matter for these systems. Movement environments in these plants are high temperature and humidity, so it is difficult to put sensors near motors. In such a case, we must find the trouble of the system without torque sensor or speed sensor. The proposal method can estimate the torque and rotational speed of induction motor by using time-series data of voltages and currents at the switchboard. Furthermore, we propose the parameter identification method of mutual inductance by comparing the inner and outer products between voltages and currents. First, a torque and rotational speed of induction motor are estimated. Next, a mutual inductance parameter is got. Last, the proposed estimation method is verified by results of experiment.
A 1 GeV/u 56 Fe ion beam allows for true 90° tilt irradiations of various microelectronic components and reveals relevant upset trends for an abundant element at the GCR flux energy peak.
A 1 GeV/u 56 Fe ion beam allows for true 90° tilt irradiations of various microelectronic components and reveals relevant upset trends for an abundant element at the GCR flux energy peak.
This paper introduces DynamicView, a novel Semantic Web application, for users to query, browse and visualize distribution and evolution of research interests in temporal, spatial and ontological dimensions. We presen...
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There are many distributed, autonomous, heterogeneous and dynamic data sources in data sharing environment. In order to achieve the goal of global data sharing without compromising the security of local domain respect...
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ISBN:
(纸本)9781424432004;9780769531854
There are many distributed, autonomous, heterogeneous and dynamic data sources in data sharing environment. In order to achieve the goal of global data sharing without compromising the security of local domain respectively, it is necessary to establish an access control mechanism to satisfy the security need of data sharing across multi-domain. In this paper, a criterion based algorithm for role mapping across multi-domain is proposed. The algorithm not only resolves the conflicts of cyclic inheritance and separation of duties, but also makes the establishment of role mapping more efficiently by preserving the historical information of role mapping paths established successfully before. Evaluation by access instances shows that the algorithm meets the demands of access control in multi-domains and scales very well.
Multicast plays an important role in supporting a new generation of applications. At present and for different reasons, technical and non-technical, multicast IP hasnpsilat yet been totally adopted for Internet. Durin...
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Multicast plays an important role in supporting a new generation of applications. At present and for different reasons, technical and non-technical, multicast IP hasnpsilat yet been totally adopted for Internet. During recent years, an active area of research is that of implementing this kind of traffic in the application layer where the multicast functionality isnt a responsibility of the routers but that of the hosts, which we know as Multicast Overlay Networks (MON). In this article, routing in an MON is put forward as a multiobjective optimization problem (MOP) where two functions are optimized: 1) the total end to end delay of the multicast tree and 2) the maximum link utilization. The simultaneous optimization of these two functions is an NP-Complete problem and to solve this we suggest using Multiobjective Evolutionary Algorithms (MOEA), specifically NSGA-II.
The current software development environment has been changing into new development paradigms such as concurrent distributed development environment and the so-called open source project by using network computing tec...
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