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IEEE International Nanoelectronics Conference (INEC)

作者： Haixia Da Kai-Tak Lam Ganesh S. Samudra Gengchiau Liang Sai-Kong Chin Department of Electrical and Computer Engineering National University of Singapore Singapore Institute of High Performance Computing Singapore

We investigate the device performance of heterojunction graphene nanoribbons tunneling field-effect transistors as a function of the doping concentrations based on the non-equilibrium Green's function. We observe that variation in source doping changes the OFF-non-equilibrium Green's functionstate currents (I OFF ), the ON-state currents (I ON ) and the subthreshold slope (SS) significantly while variation in drain doping changes mainly the I OFF . Additionally, low SS and large I ON /I OFF ratio can be achieved by applying proper asymmetric source-drain doping.

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Modeling and analysis of dual-arm cluster tools for wafer fabrication with revisiting

Modeling and analysis of dual-arm cluster tools for wafer fa...

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2011 7th IEEE International Conference on Automation Science and engineering, CASE 2011

作者： Qiao, Yan Wu, NaiQi Zhou, MengChu Department of Industrial Engineering School of Mechatronics Engineering Guangdong University of Technology Guangzhou 510006 China Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 200092 China Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102-1982 United States

ISBN: (纸本)9781457717307

Some wafer fabrication processes are repeated processes, e.g. atomic layer deposition (ALD) process. For such processes, the wafers need to visit some processing modules for a number of times, which complicates the cycle time analysis. This paper studies the cycle time analysis problem for such processes. With a Petri net model, it is found that such processes contain local cycles involving only the revisiting PMs and global cycles involving both revisiting and non-revisiting PMs. The process switches between these two types of cycles such that the process never reaches a steady state. Based on this finding, the mechanism underlying such processes is revealed and analytical expressions are given for the calculation of their cycle time. Illustrative examples are presented to show the application of the proposed approach. © 2011 IEEE.

关键词： Atomic layer deposition

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Selective coupling of quantum dot exciton spin states to a photonic crystal cavity using magnetic field tuning

Selective coupling of quantum dot exciton spin states to a p...

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International Symposium Semiconductor Device Research (ISDRS)

作者： Hyochul Kim Thomas C. Shen Deepak Sridharan Glenn Solomon Edo Waks Department of Electrical and Computer Engineering IREAP and Joint Quantum Institute University of Maryland College Park USA Joint Quantum Institute National Institute for Standards and Technology USA

In this work exciton spin state degeneracy of InAs quantum dots (QDs) have been shown to be lifted by applying a magnetic field. A strong coupling between a QD exciton spin state and a photonic crystal cavity was demonstrated as well as two QDs and the cavity. Applying a magnetic field to the QD-cavity system not only serves as a method for tuning QD emission frequency, but also opens the possibility of exploring the interactions between a cavity and multi-level quantum emitter systems.

关键词： Cavity resonators Magnetic fields Excitons Couplings quantum dots Tuning Photonic crystals

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quantum Codes Give Counterexamples to the Unique Preimage Conjecture of the N-Representability Problem

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Physical Review Letters 2011年第11期106卷 110501-110501页

作者： Samuel A. Ocko Xie Chen Bei Zeng Beni Yoshida Zhengfeng Ji Mary Beth Ruskai Isaac L. Chuang Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts USA Department of Mathematics and Statistics University of Guelph Guelph Ontario Canada Institute for Quantum Computing University of Waterloo Waterloo Ontario Canada Perimeter Institute for Theoretical Physics Waterloo Ontario Canada Department of Electrical and Computer Engineering Tufts University Medford Massachusetts USA

It is well known that the ground state energy of many-particle Hamiltonians involving only 2-body interactions can be obtained using constrained optimizations over density matrices which arise from reducing an N-particle state. While determining which 2-particle density matrices are “N-representable” is a computationally hard problem, all known extreme N-representable 2-particle reduced density matrices arise from a unique N-particle preimage, satisfying a conjecture established in 1972. We present explicit counterexamples to this conjecture through giving Hamiltonians with 2-body interactions which have degenerate ground states that cannot be distinguished by any 2-body operator. We relate the existence of such counterexamples to quantum error correction codes and topologically ordered spin systems.

关键词： Hamiltonians

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Visualization of the mining models on a data mining and integration platform

Visualization of the mining models on a data mining and inte...

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作者： Janciak, Ivan Lenart, Marek Brezany, Peter Novakova, Lenka Habala, Ondrej Research Group of Scientific Computing Faculty of Computer Science University of Vienna Austria Department of Cybernetics Faculty of Electrical Engineering Czech Technical University Czech Republic Institute of Informatics Slovak Academy of Sciences Slovakia

ISBN: (纸本)9789532330670

An appropriate and understandable data visualization is a key feature for the usability of a data mining system. The proper visualization methods for data exploration increase the whole acceptability of the system and proper selection of the further data processing tasks. This paper introduces a framework for visualization of results as it is being implemented in the European project ADMIRE (Advanced Data Mining and Integration Research for Europe). The feasibility of the framework for distributed systems is presented on a real data mining and integration scenario. We describe two visualization components fully implemented and deployed in the distributed environment. The first one is implemented on the ADMIRE Gateway and is processing input data and producing information required by the second component residing on the ADMIRE Workbench, which provides the actual graphical visualization. The ADMIRE Gateway and Workbench are two basic components of the distributed ADMIRE Platform. © 2011 MIPRO.

关键词： Data mining

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Hybrid optimization with improved tabu search

Hybrid optimization with improved tabu search

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作者： Mashinchi, M. Hadi Orgun, Mehmet A. Pedrycz, Witold Department of Computing Macquarie University Sydney NSW 2109 Australia Department of Electrical and Computer Engineering University of Alberta Edmonton AB T6R 2G7 Canada Systems Research Institute Polish Academy of Sciences Warsaw Poland

Finding a global optimum of an unknown system has attracted a great deal of interest in many engineering problems. In this settings, meta-heuristics are very common as efficient approaches for solving complex real-world problems in global continuous optimization problems (GCOPs) as they can approximate solutions without considering mathematical constraints such as differentiability. In this study, we propose a method based on tabu search (TS) and Nelder-Mead (NM) search strategy in application to GCOPs. To increase the robustness of the proposed method, we add a new phase, referred to as partitioning phase, before diversification which is realized by the TS. The TS is improved and then followed by the NM search strategy. The partitioning phase aims at distributing initial random solutions in the search space. By doing this, we increase the robustness of the method. The TS has an interesting ability of covering a wide solution space by promoting the search far away from the current solution and consecutively decreasing the possibility of trapping in local minima. The neighbour search-strategy of the TS is improved to accelerate the speed of finding the near optimum solution. Instead of just generating random neighbours around the current solution, we generate some neighbours in the direction of the previous move as well as some neighbours in the previous best crown. When certain criteria are reached for the diversification of the search space, the NM search strategy is carried out with the focus on the intensification of the solution found in the diversification phase. We assess the performance of the algorithm for a range of standard test functions available in the literature and compare the obtained results with those available in the literature. There are two main advantages of the proposed method;first, it can apply to any GCOP without considering any constraints and secondly, it shows better performance (in terms of function evaluation, success rate, and average

关键词： Tabu search

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Nonorthogonal state discrimination below the homodyne limit

Nonorthogonal state discrimination below the homodyne limit

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Laser Science, LS 2011

作者： Becerra, F.E. Fan, J. Baumgartner, G. Polyakov, S. Goldhar Kosloski, J.T. Migdall, A. Joint Quantum Institute Department of Physics University of Maryland National Institute of Standards and Technology 100 Bureau Drive Gaithersburg MD 20899 United States Laboratory for Telecommunications Sciences 8080 Greenmead Drive College Park MD 20740 United States Department of Electrical and Computer Engineering University of Maryland College Park 2410 A.V. Williams Bldg MD 20742 United States Department of Electrical and Computer Engineering Johns Hopkins University Baltimore MD 21218 United States

ISBN: (纸本)9781557529176

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PAC-PLRU: A cache replacement policy to salvage discarded predictions from hardware prefetchers 11

PAC-PLRU: A cache replacement policy to salvage discarded pr...

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Proceedings of the 2011 11th IEEE/ACM International Symposium on Cluster, Cloud and Grid computing

作者： Zhang, Ke Wang, Zhensong Chen, Yong Zhu, Huaiyu Sun, Xian-He Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Graduate University Chinese Academy of Sciences Beijing 100049 China Department of Computer Science Texas Tech University Lubbock TX 79409 United States Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 United States Department of Computer Science Illinois Institute of Technology Chicago IL 60616 United States

ISBN: (纸本)9780769543956

Cache replacement policy plays an important role in guaranteeing the availability of cache blocks, reducing miss rates, and improving applications' overall performance. However, recent research efforts on improving replacement policies require either significant additional hardware or major modifications to the organization of the existing cache. In this study, we propose the PAC-PLRU cache replacement policy. PAC-PLRU not only utilizes but also judiciously salvages the prediction information discarded from a widely-adopted stride prefetcher. The main idea behind PAC-PLRU is utilizing the prediction results generated by the existing stride prefetcher and preventing these predicted cache blocks from being replaced in the near future. Experimental results show that leveraging the PAC-PLRU with a stride prefetcher reduces the average L2 cache miss rate by 91 over a baseline system with only PLRU policy, and by 22 over a system using PLRU with an unconnected stride prefetcher. Most importantly, PAC-PLRU only requires minor modifications to existing cache architecture to get these benefits. The proposed PAC-PLRU policy is promising in fostering the connection between prefetching and replacement policies, and have a lasting impact on improving the overall cache performance. © 2011 IEEE.

关键词： computer architecture

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Extracting all minimal siphons from maximal unmarked siphons in manufacturing-oriented Petri nets

Extracting all minimal siphons from maximal unmarked siphons...

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2011 7th IEEE International Conference on Automation Science and engineering, CASE 2011

作者： Wang, ShouGuang Zhou, MengChu Wang, ChengYing College of Information and Electronic Engineering Zhejiang Gongshang University Hangzhou 310018 China Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102-1982 United States MoE Key Laboratory of Embedded System and Service Computing Tongji University Shanghai 200092 China

ISBN: (纸本)9781457717307

Deadlock control is an important research issue in automated manufacturing systems that have a high degree of resource sharing and concurrency. Since minimal siphons are closely tied with deadlocks in Petri net models, their efficient extraction is fundamentally important. The existing methods can rapidly extract one minimal siphon given a maximal unmarked siphon that is obtained by using a mixed integer programming approach. This paper for the first time presents an extraction algorithm that can efficiently extract all minimal ones. The idea is based on the generation and use of a subnet tree structure given the places in a maximal unmarked siphon. Several Petri net models of automated manufacturing systems are used to illustrate the proposed concepts and methods. © 2011 IEEE.

关键词： Petri nets

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Selection of Spatiotemporal Features in Breast MRI to Differentiate between Malignant and Benign Small Lesions Using computer-Aided Diagnosis

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Advances in Artificial Neural Systems 2012年第1期2012卷

作者： F. Steinbruecker A. Meyer-Baese C. Plant T. Schlossbauer U. Meyer-Baese Department of Computer Science Technical University of Munich 8574 Garching Germanytum.de Department of Scientific Computing Florida State University Tallahassee FL 32306-4120 USAfsu.edu Institute for Clinical Radiology University of Munich 81377 Munich Germanyuni-muenchen.de Department of Electrical and Computer Engineering FAMU/FSU College of Engineering Tallahassee FL 32310-6046 USAfsu.edu

Automated detection and diagnosis of small lesions in breast MRI represents a challenge for the traditional computer-aided diagnosis (CAD) systems. The goal of the present research was to compare and determine the optimal feature sets describing the morphology and the enhancement kinetic features for a set of small lesions and to determine their diagnostic performance. For each of the small lesions, we extracted morphological and dynamical features describing both global and local shape, and kinetics behavior. In this paper, we compare the performance of each extracted feature set for the differential diagnosis of enhancing lesions in breast MRI. Based on several simulation results, we determined the optimal feature number and tested different classification techniques. The results suggest that the computerized analysis system based on spatiotemporal features has the potential to increase the diagnostic accuracy of MRI mammography for small lesions and can be used as a basis for computer-aided diagnosis of breast cancer with MR mammography.

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