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Document Clustering Using Differential Evolution

Document Clustering Using Differential Evolution

引用

Congress on Evolutionary Computation

作者： A. Abraham S. Das A. Konar IITA Professorship Program School of Computer Science and Engineering Chung Ang University Seoul South Korea Department of Electronics and Telecommunication Engineering Jadavpur University Kolkata India

This paper investigates a novel approach for partitional clustering of a large collection of text documents by using an improved version of the classical differential algorithm (DE). Fast and accurate clustering of documents plays an important role in the field of text mining and automatic information retrieval systems. The k-means has served as the most widely used partitional clustering algorithm for text documents. However, in most cases it provides only locally optimal solutions. In this work, the clustering problem has been formulated as an optimization task and is solved using a modified DE algorithm. To reduce the computational time, a hybrid k-means with DE method has also been proposed. The new algorithms were tested on a number of document datasets. Comparison with k-means, a state of the art PSO and one recently proposed real coded GA based text clustering methods reflects the superiority of the proposed techniques in terms of speed and quality of clustering.

关键词： Clustering algorithms Partitioning algorithms Information retrieval Tree graphs Genetic algorithms Particle swarm optimization computer science Text mining Testing Clustering methods

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Novel Design of Interactive Multimodal Biofeedback System for Neurorehabilitation

Novel Design of Interactive Multimodal Biofeedback System fo...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： He Huang Y Chen W Xu H. Sundaram L. Olson T Ingalls T Rikakis Jiping He Center for Neural Interface Design Biodesign Institute Harrington USA Computer Science and Engineering Arts Media and Engineering Program Arizona State University Tempe AZ USA

A previous design of a biofeedback system for Neurorehabilitation in an interactive multimodal environment has demonstrated the potential of engaging stroke patients in task-oriented neuromotor rehabilitation. This report explores the new concept and alternative designs of multimedia based biofeedback systems. In this system, the new interactive multimodal environment was constructed with abstract presentation of movement parameters. Scenery images or pictures and their clarity and orientation are used to reflect the arm movement and relative position to the target instead of the animated arm. The multiple biofeedback parameters were classified into different hierarchical levels w.r.t. importance of each movement parameter to performance. A new quantified measurement for these parameters were developed to assess the patient's performance both real-time and offline. These parameters were represented by combined visual and auditory presentations with various distinct music instruments. Overall, the objective of newly designed system is to explore what information and how to feedback information in interactive virtual environment could enhance the sensorimotor integration that may facilitate the efficient design and application of virtual environment based therapeutic intervention

关键词： Biological control systems Virtual reality Virtual environment Helium Design engineering Spatiotemporal phenomena Error correction Cities and towns USA Councils Multimedia systems

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Reconfigurable crossbar switch architecture for network processors

Reconfigurable crossbar switch architecture for network proc...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： H.C. Freitas M.B. Carvalho A.M. Amaral A.R.M. Diniz C.A.P.S. Martins L.E.S. Ramos Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Belo Horizonte Brazil Computer Science Rutgers University NJ USA

This paper presents the proposal and development of a reconfigurable crossbar switch (RCS) architecture for network processors. Its main purpose is to increase the performance, and flexibility for environments with multiprocessors and computer clusters. The results include VHDL simulation of RCS and the use of it in a broadcast function implementation, found in message passing support middleware

关键词： Switches Engines Field programmable gate arrays Network topology computer architecture Proposals Communication switching Circuit topology Broadcasting Application specific integrated circuits

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Custom error control schemes for energy efficient bluetooth sensor networks

Custom error control schemes for energy efficient bluetooth ...

引用

International Symposium on Telecommunications

作者： Joao H. Kleinschmidt Walter C. Borelli Marcelo E. Pellenz Department of Telematics School of Electrical and Computer Engineering State University of Campinas Sao Paulo Brazil Graduate Program in Computer Science Pontifical Catholic University of Paraná Curitiba Parana Brazil

This paper analyzes the effect of custom error control schemes on the energy efficiency in Bluetooth sensor networks. The energy efficiency metric considers in just one parameter the energy and reliability constraints of the wireless sensor networks. New packet types are introduced using some error control strategies in the AUX1 packet, such as Hamming and BCH codes, with and without CRC for error detection. Two adaptive techniques are proposed that change the error control strategy based on the number of hops traversed by a packet through the network. The performance results are obtained through simulations in a channel with Rayleigh fading for networks with different number of hops, showing that error control can improve the energy efficiency of a Bluetooth-based sensor network.

关键词： Error correction Energy efficiency Bluetooth Wireless sensor networks Media Access Protocol Energy consumption Sensor phenomena and characterization Automatic repeat request Analytical models Cyclic redundancy check

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A SCORM/IMS Compliance Online Test and Diagnosis System

A SCORM/IMS Compliance Online Test and Diagnosis System

引用

International Conference on Information Technology Based Higher Education and Training, ITHET

作者： Jyh-Cheng Chang Shao-Chun Li Alex Chang Maiga Chang Department of Information & Computer Engineering Chung Yuan Christian University Chungli Taiwan National Science and Technology Program for e-Learning Chungli Taiwan

Teachers always want to know how much their students had learned in classes. The most convenient way to discover learning status is `test'. Each item on a test sheet always contains one or more concepts used to check whether a student really understands or not. Teachers can also find a student's misconceptions out via the concept relations stored in a test sheet. In order to make the diagnosis process simple, teachers always take concept maps as their test development and learning diagnosis tools. This paper implements a SCORM/IMS compliance online test and diagnosis system base on concept maps. In the system, it has more than 5000 members and generates real-time learning report for misconception diagnosis over 500 times monthly. The members are the third-year student at junior high school and come from different counties and cities all over the country. Currently, the system covers 11 courses such as Chinese, English, Physics, History, and Earth science. It's obviously the system is useful for both teachers and students

关键词： System testing Learning systems Real time systems Materials testing Embedded computing Education Electronic learning Cities and towns Physics History

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Incorporation of Markov reliability models for digital instrumentation and control systems into existing PRAs

Incorporation of Markov reliability models for digital instr...

引用

5th International Topical Meeting on Nuclear Plant Instrumentation Controls, and Human Machine Interface Technology (NPIC and HMIT 2006)

作者： Bucci, P. Mangan, L.A. Kirschenbaum, J. Mandelli, D. Aldemir, T. Arndt, S.A. Ohio State University Dept. of Computer Science and Engineering 395 Dreese Labs. 2015 Neil Ave. Columbus OH 43210 Ohio State University Nuclear Engineering Program 650 Ackerman Road Columbus OH 43202 U.S. Nuclear Regulatory Commission Office of Nuclear Regulatory Research Washington DC 20555

ISBN: (纸本)0894480510

Markov models have the ability to capture the statistical dependence between failure events that can arise in the presence of complex dynamic interactions between components of digital instrumentation and control systems. One obstacle to the use of such models in an existing probabilistic risk assessment (PRA) is that most of the currently available PRA software is based on the static event-tree/fault-tree methodology which often cannot represent such interactions. We present an approach to the integration of Markov reliability models into existing PRAs by describing the Markov model of a digital steam generator feedwater level control system, how dynamic event trees (DETs) can be generated from the model, and how the DETs can be incorporated into an existing PRA with the SAPHIRE software.

关键词： Nuclear instrumentation

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Chitosan for biofunctionalization of microsystems

Chitosan for biofunctionalization of microsystems

引用

2006 IEEE/NLM Life science Systems and Applications Workshop, LiSA 2006

作者： Koev, Stephan T. Powers, Michael A. Badilita, Vlad Yi, Hyunmin Bentley, William E. Payne, Gregory F. Rubloff, Gary W. Ghodssi, Reza Department of Electrical and Computer Engineering University of Maryland College Park MD 20742 Department of Materials Science and Engineering University of Maryland College Park MD 20742 Department of Chemical Engineering University of Maryland College Park MD 20742 University of Maryland College Park MD 20742 University of Maryland College Park MD 20742 Bioengineering Graduate Program University of Maryland College Park MD 20742

ISBN: (纸本)1424402786

We present the use of the polysaccharide chitosan for immobilizing biomolecules on microfabricated device surfaces. The main advantages of chitosan are its abundance of primary amine groups and its ability to be electrodeposited. Biomolecules are easily attached to chitosan's amines by standard glutaraldehyde chemistry. The electrodeposition of chitosan allows accurate spatial and temporal control of biomolecule placement. We have demonstrated this biofunctionalization method for two different BioMEMS devices: a biophotonic sensor and a micromechanical biosensor. We have successfully assembled probe DNA on each of them and detected hybridization with target DNA as a demonstration of sensor operation. Here, we briefly present the fabrication procedure and testing results for both of these BioMEMS sensing devices. © 2006 IEEE.

关键词： Microsystems

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Increasing the performance of cortically-controlled prostheses

Increasing the performance of cortically-controlled prosthes...

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28th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBS'06

作者： Shenoy, Krishna V. Santhanam, Gopal Ryu, Stephen I. Afshar, Afsheen Yu, Byron M. Gilja, Vikash Linderman, Michael D. Kalmar, Rachel S. Cunningham, John P. Kemere, Caleb T. Batista, Aaron P. Churchland, Mark M. Meng, Teresa H. Department of Electrical Engineering Stanford University Stanford CA 94305 United States Neurosciences Program Stanford University Stanford CA 94305 United States Department of Neurosurgery Stanford University Stanford CA 94305 United States Medical Scientist Training Program Stanford University Stanford CA 94305 United States Department of Computer Science Stanford University Stanford CA 94305 United States

ISBN: (纸本)1424400325

Neural prostheses have received considerable attention due to their potential to dramatically improve the quality of life of severely disabled patients. Cortically-controlled prostheses are able to translate neural activity from cerebral cortex into control signals for guiding computer cursors or prosthetic limbs. Non-invasive and invasive electrode techniques can be used to measure neural activity, with the latter promising considerably higher levels of performance and therefore functionality to patients. We review here some of our recent experimental and computational work aimed at establishing a principled design methodology to increase electrodebased cortical prosthesis performance to near theoretical limits. Studies discussed include translating unprecedentedly brief periods of "plan" activity into high information rate (6.5 bits/s) control signals, improving decode algorithms and optimizing visual target locations for further performance increases, and recording from chronically implanted arrays in freely behaving monkeys to characterize neuron stability. Taken together, these results should substantially increase the clinical viability of cortical prostheses. © 2006 IEEE.

关键词： Prosthetics

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A Hybrid Rough Set--Particle Swarm Algorithm for Image Pixel Classification

A Hybrid Rough Set--Particle Swarm Algorithm for Image Pixel...

引用

International Conference on Hybrid Intelligent Systems (HIS)

作者： Swagatam Das Ajith Abraham Subir Kumar Sarkar Department of Electronics and Telecommunication Engineering Jadavpur University Kolkata India School of Computer Science IITA Professorship Program Yonsei University Seoul South Korea

This article presents a framework to hybridize the rough set theory with a famous swarm intelligence algorithm known as Particle Swarm Optimization (PSO). The hybrid rough-PSO technique has been used for grouping the pixels of an image in its intensity space. Medical and remote sensing satellite images become corrupted with noise very often. Fast and efficient segmentation of such noisy images (which is essential for their further interpretation in many cases) has remained a challenging problem for years. In this work, we treat image segmentation as a clustering problem. Each cluster is modeled with a rough set. PSO is employed to tune the threshold and relative importance of upper and lower approximations of the rough sets. Davies-Bouldin clustering validity index is used as the fitness function, which is minimized while arriving at an optimal partitioning.

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A Supervised Constructive Neuro-Immune Network for Pattern Classification

A Supervised Constructive Neuro-Immune Network for Pattern C...

引用

International Joint Conference on Neural Networks (IJCNN)

作者： H. Knidel L. Nunes de Castro F.J. Von Zuben Laboratory of Bioinformatics and Bioinspired Computing-LBiC Department of Computer Engineering and Industrial Automation-DCA School of Electrical and Computer Engineering-FEEC State University of Campinas-UNICAMP Sao Paulo Brazil Graduate Program in Computer Science Catholic University of Santos Sao Paulo Brazil

This paper proposes a supervised version of a learning algorithm for a constructive neuro-immune network. The proposed methodology is developed by taking ideas from the immune system and learning vector quantization. The resulting classification algorithm is characterized by high-performance, similar to the ones produced by alternative methods in the literature, and parsimonious solutions, with a much smaller set of prototypes per class when compared with the other approaches. The number of prototypes is automatically defined by the convergence criterion. The algorithm requires a single user-defined parameter for training, associated with the convergence criterion, and the computational cost is sufficiently reduced to support applications involving large data sets.

关键词： Pattern classification Immune system Neurons Supervised learning Vector quantization Classification algorithms Prototypes Clustering algorithms Unsupervised learning Artificial neural networks

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