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Congress on Evolutionary Computation

作者： Udit Halder Swagatam Das Dipankar Maity Ajith Abraham Preetam Dasgupta Department of Electronics and Telecommunication Engineering Jadavpur University Kolkata India Faculty of Computer Science and Electrical Engineering VSB - Technical University of Ostrava Czech Republic Machine Intelligence Research Labs (MIR Labs) Seattle WA USA

In this paper we propose a Self Adaptive Cluster based and Weed Inspired Differential Evolution algorithm (SACWIDE), the total population is divided into several clusters based on the positions of the individuals and the cluster number is dynamically changed by the suitable learning strategy during evolution. Here we incorporate a modified version of the Invasive Weed Optimization (IWO) algorithm as a local search technique. The algorithm strategically determines whether a particular cluster will perform Differential Evolution (DE) or the IWO algorithm (modified). The number of clusters in a particular iteration is set by the algorithm itself self-adaptively. The performance of SACWIDE is reported on the set of 22 benchmark problems of CEC-2011.

关键词： Clustering algorithms Optimization Iron Algorithm design and analysis Convergence Performance evaluation Heuristic algorithms

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Autonomous passive light tracking utilizing single-wall carbon nanotube enhanced opto-thermo-mechanical elastomer actuators

Autonomous passive light tracking utilizing single-wall carb...

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International Conference on Solid State Sensors and Actuators (TRANSDUCERS)

作者： Ye Liu Chensha Li Chi-Wei Lo Hongrui Jiang Electrical and Computer Engineering Department University of Wisconsin Madison Madison WI USA Materials Science Program University of Wisconsin Madison Madison WI USA

We have developed novel opto-thermo-mechanical actuators by effectively distributing a significant amount of single-wall carbon nanotube (SWCNT, up to 0.7%w/w) into liquid crystal elastomer (LCE) matrices. These SWCNT/LCE actuators exhibit a great potential to be utilized in MEMS applications, as they respond to a wide spectrum of visible/near-infrared light, and possess a large reversible compressive strain (up to 35%) when stimulated. Autonomous and passive light tracking is demonstrated here as one of the applications. With a simple design, the actuators are able to adaptively tilt a solar cell towards the light source by a degree of ~15° (with an incident light intensity of 1.6 kW/m 2 ). As a result, the photocurrent output of the solar cell is significantly enhanced (up to 247.10%) without any other control system or external energy source.

关键词： Actuators Photovoltaic cells Photoconductivity Films Carbon nanotubes Light sources Micromechanical devices

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An authentication protocol based on kerberos 5

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International Journal of Network Security 2011年第3期12卷 159-170页

作者： El-Emam, Eman Koutb, Magdy Kelash, Hamdy Faragallah, Osama S. Egyptian Space Program National Authority for Remote Sensing and Space Sciences El-Nozha El-Gedeeda Cairo Egypt Department of Industrial Electronics and Control Faculty of Electronic Engineering Menouf Egypt Department of Computer Science and Engineering Faculty of Electronic Engineering Menouf Egypt

We introduce some modifications to the widely deployed Kerberos authentication protocol. The principle's secret-key will be independent of the user password to overcome the weak passwords chosen by the network principal that are susceptible to password guessing attacks, the main drawback of the Kerberos protocol. Instead, the Kerberos Distribution Center saves a profile for every instance in its realm to generate the principle's secret-key by hashing the profile, and encrypting the output digest. Besides, the lifetime of the secret-key is controlled using the sys-tem clock. Triple-Des is used for encryption, SHA-256 for hashing, and Blum Blum Shub for random number gen-eration.

关键词： Authentication

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Optimization of defect hole placement in resonant cavities

Optimization of defect hole placement in resonant cavities

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作者： Kang, Christopher Weiss, Sharon M. Vlasov, Yurii A. Assefa, Solomon Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Physics and Astronomy Vanderbilt University Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University 37235 United States IBM T.J. Watson Research Center Yorktown Heights NY 10536 United States

We demonstrate the resonance wavelength and quality factor dependence of 50nm defect-hole placement within photonic crystal L3 microcavities. Proper placement of defect-holes leads to a 12% increase in photonic crysta... 详细信息

ISBN: (纸本)9781557529107

关键词： Photonic crystals

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Characteristics of step-graded InxGa1-xAs and InGaPySb1-y metamorphic buffer layers on GaAs substrates

Characteristics of step-graded InxGa1-xAs and InGaPySb1-y me...

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作者： Kirch, J. Dudley, P. Kim, T. Radavich, K. Ruder, S. Mawst, L.J. Kuech, T.F. Lalumondiere, S.D. Sin, Y. Lotshaw, W.T. Moss, S.C. Department of Electrical and Computer Engineering University of Wisconsin - Madison 1415 Engineering Dr. Madison WI 53706 United States Materials Science Program University of Wisconsin - Madison 1415 Engineering Dr. Madison WI 53706 United States Department of Chemical and Biological Engineering University of Wisconsin - Madison 1415 Engineering Dr. Madison WI 53706 United States Aerospace Corporation Electronics and Photonics Lab El Segundo CA 90245 United States

ISBN: (纸本)9781457717536

Step-graded InGaPySb1-y and InxGa 1-xAs metamorphic buffer layer (MBL) structures are grown on GaAs substrates by metal-organic chemical vapor deposition (MOCVD). AFM analysis indicates that graded group V InGaPySb1-y MBLs exhibit significantly lower surface roughness (∼4.7nm) compared with more conventional graded group III InxGa1-xAs MBLs, which typically have rms surface roughness in the range of 7- 14nm. To reduce the surface roughness of the InxGa1-xAs MBL, a post growth Chemical-Mechanical Polishing (CMP) procedure is implemented. AFM image analysis indicates the CMP process is effective in reducing the step-graded In xGa1-xAs MBL surface roughness from ∼7.3 nm (as-grown) to 2.3 nm post CMP. Preliminary studies indicate that bulk InGaAs layers regrown on top of the MBL subjected to CMP exhibit improved static and transient PL characteristics compared with those deposited on as-grown MBLs. © VDE VERLAG GMBH.

关键词： III-V semiconductors

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3 Vectors Game and Balance Multicast architecture Algorithms for Sensor Grid

3 Vectors Game and Balance Multicast architecture Algorithms...

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IEEE Conference on computer Communications Workshops, INFOCOM Wksps

作者： Qingfeng Fan Qiongli Wu Naixue Xiong Athanasios Vasilakos Yanxiang He Saint-Quentin Laboratory PRISM University of Versailles Versailles France INRIA Saclay Ecole Centrale de Paris Ile-de-France France Department of Computer Science Georgia State University Atlanta GA USA Department of Computer and Telecommunication Engineering University of Western Macedonia Greece School of computer science Wuhan University of China Wuhan China

ISBN: (纸本)9781457702495

We propose a scheme to reach shorter multicast delay, better energy utilizing efficiency and higher efficiency of data transferring for Sensor Grid. Our scheme calculates the space, energy and data weight vectors in one cluster. Then it searches a new vector composed by the linear combination of the three individual ones. We build game balance equation, use the equal correlation coefficient between the new and old vectors to find the point of game balance, seek linear parameters, and generate a least weight path tree. Extended simulation results indicate that our scheme attains less average multicast delay, the number of links used and better system robusticity.

关键词： Clustering algorithms Vectors Games Delay Routing Robot sensing systems Mathematical model

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Dual Transform Technique for Robust Steganography

Dual Transform Technique for Robust Steganography

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International Conference on Computational Intelligence and Communication Networks (CICN)

作者： K.B. Shiva Kumar T. Khasim K.B. Raja Sabyasachi Pattnaik R.K. Chhotaray Department of Telecommunication Engg Sri Siddhartha Institute of Technology Tumkur India Department of ECE University Visvesvaraya College of Engineering Bangalore India Department of Information and Communication Technology Fakir Mohan University Balasore India Department of Computer science Engg Seemanta Engineering College Mayurbhanj India

Steganography enables to have a secret communication in modern information technology using public channel. In this paper, we propose Dual Transform Technique for Robust Steganography (DTTRS). The cover image is segmented into blocks of 4*4 each and Discrete Wavelet Transform (DWT) is applied on each block. In the resulting DWT coefficients, blocks of vertical band of 2*2 each are considered and Integer Wavelet Transform (IWT) is applied to get blocks of 1*1 each. The IWT is applied on vertical band of DWT of payload to generate coefficients of payload and are embedded into IWT coefficients of cover image using least significant bit replacement method. On applying IIWT and IDWT, stego image is derived. The concept of error detecting and correcting coding technique is employed to ensure more reliable communication. It is observed that the proposed algorithm has excellent PSNR, provides high level security and more robust compared to individual transform techniques.

关键词： Payloads Discrete wavelet transforms PSNR Robustness Security

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Structure and magnetic properties characterization of electrodeposited Co37Fe63 alloys containing oxygen for magnetic recording applications

Structure and magnetic properties characterization of electr...

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作者： Elhalawaty, S. Carpenter, R.W. George, J. Brankovic, S.R. Materials Science and Engineering Graduate Program School for Engineering of Matter Transport and Energy Arizona State University 85287-6106 United States LeRoy Eyring Center for Solid State Science Arizona State University AZ 85287-9506 United States Center for Nanomagnetic Systems University of Houston TX 77204-4005 United States Electrical and Computer Engineering Department University of Houston TX 77204-4005 United States

ISBN: (纸本)9781118029473

Soft and high magnetic moment Co37Fe63 films were electro-deposited with variable additives on Cu/Ti/Si substrates. The correlation between structure and magnetic properties has been investigated. TEM showed the crystal structure of the films to be BCC with a 〈111〉 texture, and a grain size in the range of 10-20 nm. Oxygen in the deposited films has been identified by EDS and EELS using HAADF STEM. SIMS analysis revealed the presence of hydrogen and oxygen in the deposited CoFe films. Electron microscopy results showed that the oxygen was mainly distributed along the grain boundaries in the CoFe film. In regions where oxygen was present in the films, the Fe content was enhanced relative to Co. The magnetic properties of the deposits have been measured by Vibrating Sample Magnetometer (VSM), quantifying the impact of incorporated oxygen in the film on the saturation magnetization and the coercivity.

关键词： Magnetic properties

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MLEA： A Solution for Users of Android in UTPVirtual

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computer Technology and Application 2011年第5期2卷 406-412页

作者： Gisela Torres de Clunie Sergio Crespo Coelho da Silva Pinto Aris Linet Castillo Lucas Monteiro Braz Tasia Serrao Norman Rangel Jeanette Riley Olinda de Barraza Kexy Rodriguez Computer Systems Engineering Department Technological University of Panama Panama 0819 Panama Computer Science Research and Graduate Program in Applied Computing University of the Sinos Valley （UNISINOS） RS 93022-000 Brazil CIDITIC Technological University of Panama Panama 0819 Panama

This paper describes a design of an educational platform for a mobile learning architecture, which is a state of the an topic in distance education. The product will allow users to interact in an efficient, flexible, and transparent fashion with a web-based education environment, in this case Module Object-Oriented Dynamic Learning Environment （Moodle）, using Android mobile devices. In order to provide a strong and lasting architecture, the Service Oriented Architecture （SOA） methodology is used given that it allows easy software re-utilization as well as integration of heterogeneous services. The architecture is based on web services implemented with Representational State Transfer （REST）, as it has been demonstrated to be lighter and less consuming than other protocols, for devices with limited resources such as mobile devices. Web services provide the communication means between the server side and the client side of the architecture, whereas agents are used to deliver the services itself. The authors propose the development of an environment that facilitates the integration of various educational resources to support m-learning. An important aspect of the proposal is the offering of a tool to provide customized alerts for students and teachers, enabling them to remain updated about activities taking place in the courses.

关键词： Distance learning virtual education m-learning service oriented architecture （SOA） mobile learning mobile computing interoperability representational state transfer （REST）.

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LOW-FREQUENCY ELECTRONIC NOISE IN GRAPHENE TRANSISTORS: COMPARISON WITH CARBON NANOTUBES

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International Journal of High Speed Electronics and Systems 2011年第1期20卷 161-170页

作者： GUANXIONG LIU WILLIAM STILLMAN SERGEY RUMYANTSEV MICHAEL SHUR ALEXANDER A. BALANDIN Nano-Device Laboratory Department of Electrical Engineering Materials Science and Engineering Program Bourns College of Engineering University of California – Riverside Riverside California 92521 USA Center for Integrated Electronics and Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy New York 12180 USA Ioffe Physico-Technical Institute Russian Academy of Sciences St. Petersburg 194021 Russia Nano-Device Laboratory Department of Electrical Engineering and Materials Science Engineering Program Bourns College of Engineering University of California – Riverside Riverside California 92521 USA

We report results of the experimental investigation of the low-frequency noise in graphene transistors. The graphene devices were measured in three-terminal configuration. The measurements revealed low flicker noise levels with the normalized noise spectral density close to 1/f (f is the frequency) and the Hooge parameter α H ~10 -3 . Both top-gate and back-gate devices were studied. The analysis of the noise spectral-density dependence on the gate biases helped us to elucidate the noise sources in these devices. We compared the noise performance of graphene devices with that of carbon nanotube devices. It was determined that graphene devices works better than carbon nanotube devices in terms of the low-frequency noise. The obtained results are important for graphene electronic, communication and sensor applications.

关键词： graphene 1/ f noise carbon nanotubes low-frequency noise graphene transistors

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