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Independent component analysis: Embedded LTSA 7

7th International Conference on Intelligent systems and Knowledge engineering, ISKE 2012 with 1st International Conference on Cognitive systems and Information Processing, CSIP 2012

作者： Yang, Qianwen Li, Yuan Sun, Fuchun Yang, Qingwen State Key Laboratory of Intelligence Technology and Systems Department of Computer Science and Technology Tsinghua University Beijing100084 China School of Information Engineering University of Science and Technology Beijing China School of Electrical and Information Engineering Beijing Jiao Tong University Beijing China

ISBN: (纸本)9783642378287

In order to solve the adaptability problem of local tangent space alignment (LTSA) with potential higher-order information loss in manifolds, a novel algorithm is proposed to optimize the extraction of local neighborhood information. The algorithm is based on LTSA and ICA algorithms, which is called the IELTSA algorithm. By optimizing the extraction of the tangent vectors, the algorithm can improve dimension reduction in high-dimensional and unevenly distributed manifolds. The proposed algorithm is feasible in carrying out manifold learning, and the reconstruction error is no more than that of LTSA. Experiments show that IELTSA can be applied to changed-density 3D curves and face images targeted at lower dimensions, showing highest performance over LTSA and other improved methods based on LTSA, and achieving the highest recognition rate in lower-dimensional embedding. The algorithm can effectively reconstruct low-dimensional coordination in curves with changed-density and also shows adaptability in high-dimensional images targeted at lower dimensions. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Independent component analysis

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Enabling decentralised microblogging through P2PVPNs

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International Journal of Security and Networks 2013年第3期8卷 169-178页

作者： St Juste, Pierre Eom, Heungsik Woodruff, Benjamin Baker, Corey Figueiredo, Renato Advanced Computing and Information Systems Lab Wireless and Mobile Systems Laboratory Department of Electrical and Computer Engineering Florida United States

The need for user privacy in social networks has prompted the exploration of social networking designs which do not rely on the common centralised client-server model. Many peer-to-peer microblogging solutions have been proposed and/or implemented utilising various technologies such as DHTs, multicast trees, and/or gossip protocols. We propose a decentralised microblogging service that leverages available Peer-to-Peer Virtual Private Networking (P2PVPN) technologies. By leveraging the private IP connectivity of P2PVPNs, our design utilises both IP multicasting and data replication through high degree nodes to ensure that peers are able to publish messages with varying degree of scope. We study the implications of our data dissemination model for a decentralised microblogging service through simulation-based analysis using a 3-million user social graph from Orkut. We also developed a prototype implementation to demonstrate the feasibility of our design choices along with a small deployment on FutureGrid to test its performance on the internet. Copyright © 2013 Inderscience Enterprises Ltd.

关键词： Multicasting

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A Fast EMT Simulation Method for Control and Protection Studies of Microgrids

A Fast EMT Simulation Method for Control and Protection Stud...

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IEEE Power and Energy Society General Meeting

作者： Yin Xu Haixiang Gao Ying Chen Chen-Ching Liu School of Electrical Engineering and Computer Science Energy Systems Innovation Center Washington State University Department of Electrical Engineering State Key Laboratory of Power Systems Tsinghua University

ISBN: (纸本)9781479964161

In this work, ac-dc hybrid microgrids are studied, which contains inverter-interfaced distributed generators (DGs) and storages (DSs). As an effective way, electromagnetic transient (EMT) simulations are widely adopted for studies on control and protection strategies of these microgrids. However, detailed EMT simulations are time-consuming, especially for microgrids with many inverter-interfaced DGs/DSs. Based on model reduction, this paper proposes a fast EMT simulation method for microgrids. A piecewise averaged model (PAM) of inverter-interfaced DGs/DSs is established and integrated into the Electromagnetic Transient Program (EMTP). Using a microgrid with 2 PV generators and 1 battery energy storage system (BESS) as test system, the proposed method is verified by comparing simulation results with those obtained from a detailed model built in PSCAD/EMTDC. The results indicate that the proposed method can effectively speed up EMT simulation of microgrids with negligible lost in accuracy.

关键词： Microgrid Distributed energy resource (DER) Power electronics converter Averaged model Electromagnetic transient program (EMTP)

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Principal Component Analysis Anomaly Detector for Rotor Broken Bars

Principal Component Analysis Anomaly Detector for Rotor Brok...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Mohammed Obaid Mustafa George Georgoulas George Nikolakopoulos Control Engineering Group Department of Computer Science Electrical and Space Engineering Lulea University of Technology Laboratory of Knowledge and Intelligent Computing (KIC) Department of Computer Engineering Technological Educational Institute of Epirus

ISBN: (纸本)9781479940318

In this article a method for the detection of broken rotor bars in asynchronous machines operating under full load is presented. Unlike most Motor Current Signature Analysis (MCSA) approaches, which operate in the frequency domain, our method operates in the time domain. The scheme is based on the use of a Principal Component Analysis (PCA) fault/anomaly detector. PCA is applied on the three stator currents to subsequently calculate the Q statistic which is employed for detecting the presence/absence of a fault. The efficiency of the proposed scheme was experimentally evaluated using different fault severity levels, ranging from 1/4 of a broken bar to three broken bars. The obtained results indicate that the method can detect the caused asymmetry with a very restricted amount of data.

关键词： Principal component analysis Rotors Bars Induction motors Detectors Stators Fault detection

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Wind power forecasting using emotional neural networks

Wind power forecasting using emotional neural networks

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2014 IEEE International Conference on systems, Man, and Cybernetics, SMC 2014

作者： Lotfi, Ehsan Khosravi, Abbas Akbarzadeh, M.-R. Nahavandi, Saeid Department of Computer Engineering Torbat-e-Jam Branch Islamic Azad University Torbat-e-Jam Iran Center for Intelligence Systems Research Deakin University Geelong3217 Australia Departments of Electrical and Computer Engineering Center of Excellence on Soft Computing and Intelligent Information Processing Ferdowsi University of Mashhad Iran Centre for Intelligent Systems Research Deakin University 75 Pigdons Road Waurn PondsVIC3216 Australia

ISBN: (纸本)9781479938407

Emotional neural network (ENN) is a recently developed methodology that uses simulated emotions aiding its learning process. ENN is motivated by neurophysiological knowledge of the human's emotional brain. In this paper, ENNs are developed and examined for prediction tasks. Genetic algorithm is applied for optimal tuning of crisp numerical parameters of ENN. The performance of the proposed ENN is examined using data sets for a couple of synthetic (with constant and variable noise) and real world (wind farm power generation data) case studies. A traditional artificial neural network (ANN) is also implemented for comparison purposes. Numerical results indicate the superiority of ENN over ANN in terms of accuracy and stability. © 2014 IEEE.

关键词： Wind power

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Social incentive policies to engage commercial building occupants in demand response

Social incentive policies to engage commercial building occu...

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2014 IEEE International Conference on Automation Science and engineering, CASE 2014

作者： Li, Sisi Deng, Kun Zhou, Meng Chu Department of Electrical and Computer Engineering New Jersey Institute of Technology NewarkNJ07012 United States Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai201804 China Coordinated Science Laboratory University of Illinois at Urbana-Champaign UrbanaIL61801 United States

Occupants' comfort is the primary target in a building operation. However their efforts are often neglected and ruled out from traditional control strategies of energy-efficient building management systems. Occupant-engaged control strategies have recently attracted many research attentions and demonstrated great potentials for energy saving. With them, occupants' behavior is incorporated into the closed-loop control methods in which their initiatives actively contribute to building services and energy utility by explicitly expressing their preferences. This work proposes an occupant-engaged demand response (DR) strategy for building automation in which occupants are actively engaged to adapt their energy consumption in response to incentive opportunities designed by facility managers. A model-based study and a Nash-Equilibrium-based solution are provided to assist facility managers with the design of social incentive policies to promote occupant participation, along with the guarantee of lucrativeness for a DR event. © 2014 IEEE.

关键词： Energy efficiency

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ECG Representation with Simulated 2D and 3D VCG using Prior Knowledge Based Weighted PCA

ECG Representation with Simulated 2D and 3D VCG using Prior ...

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2012 International Conference on Medical Physics and Biomedical engineering(ICMPBE 2012)

作者： Kai Huang Liqing Zhang MOE-Microsoft Key Laboratory for Intelligent Computing and Intelligent Systems Department of Computer Science and EngineeringShanghai Jiao Tong University

It is important to use prior knowledge of signal characteristics and their distribution in time-frequency space to extract valuable information from noisy medical ***,the noise in an ECG often has a wide bandwidth which is difficult for approaches based on filters or *** adaptive filters such as Wigner filters or Kalman filters are able to remove wide-bandwidth noise,signal waveform distortion may be brought *** we propose a new noise reduction method which uses the inherent information redundancy in an *** construct 2D and 3D Vectorcardiographs from a standard 12 channel ECG signal,and then project them onto the channel axes to recreate the ECG ***,we take advantage of prior knowledge of where the valuable information is in the *** then apply a knowledge-based weighted Principle Component Analysis to reduce the noise and extract the valuable waveform with the recreated ECG signal.

关键词： Prior Knowledge based Weighted PCA,ECG denoise,information redundancy

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Fluid dynamic characterization of a novel branching anastomosis design

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International Biomechanics 2015年第1期2卷 73-78页

作者： Samuelson, Rodney Nair, Priya Snyder, Kenneth Frakes, David Preul, Mark C. Nakaji, Peter Spetzler, Robert F. Division of Neurological Surgery Barrow Neurological Institute Phoenix AZ United States School of Biological and Health Systems Engineering Arizona State University Tempe AZ United States Department of Neurosurgery University of Buffalo Buffalo NY United States School of Electrical Computer and Energy Engineering Arizona State University Tempe AZ United States Neurosurgery Research Laboratory Barrow Neurological Institute Phoenix AZ United States

Geometric characteristics of a vascular anastomosis can have important biomechanical impacts, particularly in the hemodynamic context of wall shear stress (WSS). In this study, we propose a new branching anastomosis design, the Hybrid anastomosis, to connect a donor vessel to two recipient vessels. The central obstruction characteristic of the traditional Figure 8 anastomosis is mitigated by creating a recessed lumen at the bifurcation. Chicken vessels were used to create and test three Figure 8 and three Hybrid anastomoses ex vivo. Computational fluid dynamics (CFD) simulations of idealized anastomosis designs were then used to verify the experiments and further studied the WSS and WSS gradient (WSSG) profiles of the designs. Experimental results showed increased flow through the Hybrid anastomosis (0.40 ml/s vs. 0.23 ml/s). The mean suture time averaged 20 and 28 min for the Figure 8 and Hybrid anastomoses, respectively. CFD simulations agreed with the experiments;the simulations showed lower flow resistance in the Hybrid anastomosis (1.89 kPa-s/ml vs. 6.77 kPa-s/ml). Most importantly, a set of more physiologically realistic simulations showed that the Hybrid anastomosis reduced WSS and WSSG by over 60% as compared to the Figure 8. Results demonstrated that the proposed Hybrid anastomosis can be created on a comparable surgical time scale (and from the same initial vasculature) as compared to the Figure 8 anastomosis, while decreasing flow resistance and reducing WSS and WSSG considerably. These findings support that the new Hybrid anastomosis may represent a favorable surgical alternative to the Figure 8 design. © 2015 The Author(s). Published by Taylor & Francis.

关键词： Anastomosis Computational fluid dynamics Wall shear stress

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Pinso: Precise Isolation of Concurrency Bugs via Delta Triaging

Pinso: Precise Isolation of Concurrency Bugs via Delta Triag...

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International Conference on Software Maintenance (ICSM)

作者： Bo Liu Zhengwei Qi Bin Wang Ruhui Ma Department of Computer Science and Engineering Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University Shanghai CN

Concurrent programs are known to be difficult to test and maintain. These programs often fail because of concurrency bugs caused by non-deterministic interleavings among shared memory accesses. Even though a concurrency bug can be detected, it is still hard to isolate the root cause of the bug, due to the challenge in understanding the complex thread interleavings or schedules. In this paper, we propose a practical and precise isolation technique for concurrent bugs called Pinso that seeks to exploit the non-deterministic nature of concurrency bugs and accurately find the root causes of program error, to further help developers maintain concurrent programs. Pinso profiles runtime inter-thread interleavings based on a set of summarized memory access patterns, and then, isolates suspicious interleaving patterns in the triaging phase. Using a filtration-oriented scheduler, Pinso effectively eliminates false positives that are irrelevant to the bug. We evaluate Pinso with 11 real-world concurrency bugs, including single- and multi-variable violation, from sever/desktop concurrent applications (MySQL, Apache, and several others). Experiments indicate that our tool accurately isolates the root causes of all the bugs.

关键词： Concurrent computing computer bugs Instruction sets Schedules Testing History Synchronization

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Conformational Dynamics of apo‐GlnBP Revealed by Experimental and Computational Analysis

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Angewandte Chemie 2016年第45期128卷

作者： Yitao Feng Lu Zhang Shaowen Wu Zhijun Liu Xin Gao Xu Zhang Maili Liu Jianwei Liu Xuhui Huang Wenning Wang Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Department of Chemistry and Institutes of Biomedical Sciences Fudan University Shanghai P.R. China Department of Chemistry The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong National Center for Protein Science Shanghai Institute of Biochemistry and Cell Biology Chinese Academy of Sciences Shanghai China King Abdullah University of Science and Technology (KAUST) Computational Bioscience Research Center (CBRC) Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division Thuwal 23955 Saudi Arabia Key Laboratory of Magnetic and Resonance in Biological Systems State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Centre for Magnetic Resonance Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan China Division of Biomedical Engineering Center of Systems Biology and Human Health Institute for Advance Study and School of Science The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong

The glutamine binding protein (GlnBP) binds l ‐glutamine and cooperates with its cognate transporters during glutamine uptake. Crystal structure analysis has revealed an open and a closed conformation for apo‐ and holo‐GlnBP, respectively. However, the detailed conformational dynamics have remained unclear. Herein, we combined NMR spectroscopy, MD simulations, and single‐molecule FRET techniques to decipher the conformational dynamics of apo‐GlnBP. The NMR residual dipolar couplings of apo‐GlnBP were in good agreement with a MD‐derived structure ensemble consisting of four metastable states. The open and closed conformations are the two major states. This four‐state model was further validated by smFRET experiments and suggests the conformational selection mechanism in ligand recognition of GlnBP.

关键词： FRET Konformationsdynamik Moleküldynamik NMR-Spektroskopie Proteinfaltung

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