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Volume phase transitions of smectic gels

Physical Review E 2009年第5期79卷 051704-051704页

作者： Akihiko Matsuyama []Department of Bioscience and Bioinformatics Faculty of Computer Science and System Engineering Kyushu Institute of Technology Kawazu 680-4 Iizuka Fukuoka 820-8502 Japan

We present a mean-field theory to describe volume phase transitions of side-chain liquid crystalline (LC) gels, accompanied by isotropic-nematic-smectic-A phase transitions. Three different uniaxial nematic phases (N1, N2, and N3) and smectic-A phases (S1, S2, and S3) are defined by using orientational order parameter Sm of side-chain liquid crystals (mesogens), Sb of semiflexible backbone chains, and a translational order parameter σ for a smectic-A phase. We derive the free energy for smectic-A phases of side-chain LC gels dissolved in an isotropic solvent and examine the swelling curve of the LC gel, the orientational order parameters, and the deformation of the LC gel as a function of temperature. We find that the LC gel discontinuously changes the volume at an isotropic-nematic, an isotropic-smectic-A, and a nematic-smectic-A phase transition.

关键词： Chains

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An inter-MAC architecture for heterogeneous Gigabit home networks

An inter-MAC architecture for heterogeneous Gigabit home net...

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2009 IEEE 20th Personal, Indoor and Mobile Radio Communications Symposium, PIMRC 2009

作者： Meyer, Torsten Suraci, Vincenzo Langendörfer, Peter Nowak, Stefan Bahr, Michael Jennen, Ralf Information and Communications Siemens AG Corporate Technology Munich Germany Department of System and Computer Science University of Rome La Sapienza Rome Italy Germany Communication Technology Institute Dortmund University of Technology Dortmund Germany Department of Communication Networks RWTH Aachen University Faculty 6 Aachen Germany

ISBN: (纸本)9781424451234

The home network of the near future will be a heterogeneous broadband network supporting the use of wired as well as wireless transmission technologies. The variety of services will range from HDTV via gaming to emergency services in the telemedicine area. In this paper, we introduce a technology-independent protocol layer called Inter-MAC which provides a common infrastructure to all home networking devices. The Inter-MAC can establish a connection via different transmission technologies while ensuring appropriate QoS. Key to this is the capability to correctly interpret technology-dependent PHY and MAC parameters for determining QoS when selecting initial and alternative paths, as well as the feature of admission control. Our simulations indicate clearly that the Inter-MAC approach can cope with varying loads, for instance, the time the jitter needed to stabilize was as short as 4 s. The reduced QoS was not noticeable by the user since the jitter introduced by handling additional HDTV flows was less than 0.2 ms for the existing and less than 0.7 ms for the new flow. ©2009 IEEE.

关键词： Jitter

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Solving linear fractional-order differential equations via the enhanced homotopy perturbation method

Solving linear fractional-order differential equations via t...

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3rd International Workshop on Fractional Differentiation and its Applications, FDA08

作者： Naseri, E. Ghaderi, R. Ranjbar N, A. Sadati, J. Mahmoudian, M. Hosseinnia, S.H. Momani, S. Intelligent System Research Group Babol Noushirvani University of Technology Faculty of Electrical and Computer Engineering PO Box 47135-484 Babol Iran Golestan University Gorgan Iran Mutah University PO Box 7 Al-Karak Jordan

The linear fractional differential equation is solved using the enhanced homotopy perturbation method (EHPM). In this method, the convergence has been provided by selecting a stabilizing linear part. The most significant features of this method are its simplicity and its excellent accuracy and convergence for the whole range of fractional-order differential equations. © 2009 The Royal Swedish Academy of Sciences.

关键词： Perturbation techniques

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Evaluation of P2P overlays for aoi management in distributed virtual environments

Evaluation of P2P overlays for aoi management in distributed...

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2009 International Conference on Ultra Modern Telecommunications and Workshops

作者： Bettinger, Christian Oechsle, Rainer Esch, Markus Schloss, Hermann Sturm, Peter Trier University of Applied Sciences Department of Computer Science D-54293 Trier Germany University of Luxembourg Faculty of Sciences Technology and Communication 1359 Luxembourg Luxembourg University of Trier System Software and Distributed Systems D-54286 Trier Germany

ISBN: (纸本)9781424439416

Client/Server-based DVE approaches incur scalability and load balancing problems while addressing massive number of users. In order to mitigate these problems P2P overlays are proposed for content provision and management issues instead. However, content provision and management in a distributed manner is much more complicated and requires an exhaustive study of overlay network properties. In order to investigate which kinds of overlay networks suit the requirements stated by DVEs at best, we have performed a comparative evaluation of the deterministic DHT-based Tapestry overlay and the nondeterministic prefix-tree-based P-Grid overlay considering their data location performance and construction cost. In this paper we discuss these evaluation results and exemplarily show how AoI management and content provision can be realized by using the P-Grid overlay. ©2009 IEEE.

关键词： Overlay networks

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A bit-serial sum of absolute difference accelerator for variable block size motion estimation of H.264

A bit-serial sum of absolute difference accelerator for vari...

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IEEE Conference on Innovative Technologies in Intelligent systems and Industrial Applications (CITISIA)

作者： Mohammad Reza H. Fatemi Hasan F. Ates Rosli Salleh Department of Computer System & Technology Faculty of Computer Science and Information Technology University of Malaya Kuala Lumpur Malaysia Department of Electronics Engineering Isik University Istanbul Turkey

Bit-serial architectures offer a number of attractive features over their bit-parallel counterparts such as smaller area cost, lower density interconnection, a reduced number of pins, higher clock frequency, simpler routing and etc. These attractive features make them suitable for using in VLSI design and reduce overall production cost. In this paper, we propose the first least significant bit (LSB) bit-serial sum of absolute difference (SAD) hardware accelerator for integer variable block size motion estimation (VBSME) of H.264. This hardware accelerator is based on a previous state-of-art bit-parallel architecture namely propagate partial SAD. In order to reduce area cost and improve throughput, pixel truncation technique is adopted. Due to the bit-serial pipeline architecture and using small processing elements, our architecture works at much higher clock frequency (at least 4 times) and reduces area cost about 32% compared with its bit-parallel counterpart. The proposed hardware accelerator can be used in different disciplines from low bit rate to high bit rate by making a tradeoff between the degree of parallelism or using fast algorithm or a combination of both.

关键词： Motion estimation Costs Hardware Clocks Frequency Bit rate Pins Routing Very large scale integration Production

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SR direct etching of PTFE and its application to millimeter-wave PTFE-filled waveguide

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and systems 2009年第2期129卷 259-266+9页

作者： Kishihara, Mitsuyoshi Ukita, Yoshiaki Yamamoto, Shigeaki Ohta, Isao Utsumi, Yuichi Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja-shi Okayama 719-1197 Japan Japan Laboratory of Advanced Science and Technology for Industry University of Hyogo 3-1-2 Kamigori Ako Hyogo 678-1205 Japan University of Hyogo 2167 Shosha Himeji-shi Hyogo 671-2280 Japan

Microdevices have recently been developed by various micromachining technologies such as laser cutting, lithography, etc. PTFE is widely used as a microwave and millimeter-wave material. However, it is known that PTFE is too difficult to process with high precision by conventional machining, or even by laser cutting or electrical discharge machining. It has been reported that PTFE microstructures can be fabricated by direct exposure to synchrotron radiation. In this paper, the SR direct etching of PTFE is introduced and a trial fabrication of millimeter-wave PTFE-filled waveguide by sputter deposition of metal is attempted. © 2009 The Institute of Electrical Engineers of Japan.

关键词： Millimeter waves

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Insolvency prediction model using artificial neural network for Malaysian general insurers

Insolvency prediction model using artificial neural network ...

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World Congress on Nature & Biologically Inspired Computing (NaBIC)

作者： Ng Shu Chiet Saiful Hafizah Jaaman Noriszura Ismail Siti Mariyam Shamsuddin Faculty of Science and Technology Universiti Kebangsaan Malaysia Selangor Malaysia Faculty of Computer Science & Information System Universiti Teknologi Malaysia Johor Malaysia

Insolvency of insurance companies has been a concern to the community due to the need to protect the general public from the aftermath of insurer insolvency and to try to minimize the costs associated to this difficulty such as the insurance guaranty funds. The artificial neural network is utilized in this study to create an insolvency predictive model that could predict any future failure of general insurance company in Malaysia. The neural networks results show high predictability, suggesting the usefulness of this method for predicting future insurer insolvency in Malaysia.

关键词： Predictive models Artificial neural networks Insurance Risk analysis Investments Mathematical model Fluid flow Protection Costs Data analysis

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Neuro-fuzzy system in web client-side caching

Neuro-fuzzy system in web client-side caching

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ACS/IEEE International Conference on computer systems and Applications

作者： Waleed Ali Siti Mariyam Shamsuddin Soft Computing Research Group Faculty of Computer Science & Information System University Technology of Malaysia Skudai Johor Malaysia

Web caching is a well-known strategy for improving performance of Web-based system by keeping Web objects that are likely to be used in the near future closer to the client. Although most researchers focused on designing efficient caching with proxy and origin servers, the potential gain of exploiting client-side caching based on neuro-fuzzy system is not yet being investigated. Hence, this paper proposes a splitting Web client-side cache to two caches, short-term cache and long-term cache. Initially, a Web object is stored in short-term cache. The Web objects that are visited more than the pre-specified threshold value will be moved to long-term cache and other objects in short-term cache are removed with time. Thus, we ensure that the preferred Web objects are cached in long-term cache for longer time. In this study, neuro-fuzzy is employed to determine which Web objects should be removed in order to create more spaces for the new Web objects. By implementing this mechanism, the cache space is used properly. Experimental results have shown that the proposed approach has better performance compared to the most common caching policies and has improved the performance of client-side caching substantially.

关键词： Fuzzy neural networks Pollution Fuzzy systems Neural networks Adaptive systems Inference algorithms Web services Network servers Web server computer science

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Improving performance of radial basis function network based with particle swarm optimization

Improving performance of radial basis function network based...

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Congress on Evolutionary Computation

作者： Sultan Noman Qasem Siti Mariyam Hj. Shamsuddin Soft Computing Research Group Faculty of Computer Science and Information System University Technology of Malaysia Skudai Johor Malaysia

In conventional RBF Network structure, different layers perform different tasks. Hence, it is useful to split the optimization process of hidden layer and output layer of the network accordingly. This study proposes hybrid learning of RBF Network with Particle Swarm Optimization (PSO) for better convergence, error rates and classification results. The hybrid learning of RBF Network involves two phases. The first phase is a structure identification, in which unsupervised learning is exploited to determine the RBF centers and widths. This is done by executing different algorithms such as k-mean clustering and standard derivation respectively. The second phase is parameters estimation, in which supervised learning is implemented to establish the connections weights between the hidden layer and the output layer. This is done by performing different algorithms such as Least Mean Squares (LMS) and gradient based methods. The incorporation of PSO in hybrid learning of RBF Network is accomplished by optimizing the centers, the widths and the weights of RBF Network. The results for training, testing and validation of five datasets (XOR, Balloon, Cancer, Iris and Ionosphere) illustrate the effectiveness of PSO in enhancing RBF Network learning compared to conventional Backpropogation.

关键词： Radial basis function networks Particle swarm optimization Clustering algorithms Convergence Error analysis Unsupervised learning Parameter estimation Supervised learning Least squares approximation Testing

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Application of the enhanced homotopy perturbation method to solve the fractional-order Bagley-Torvik differential equation

Application of the enhanced homotopy perturbation method to ...

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3rd International Workshop on Fractional Differentiation and its Applications, FDA08

作者： Zolfaghari, M. Ghaderi, R. SheikholEslami, A. Ranjbar, A. Hosseinnia, S.H. Momani, S. Sadati, J. Intelligent System Research Group Faculty of Electrical and Computer Engineering Babol Noushirvani University of Technology PO Box 47135-484 Babol Iran Golestan University Gorgan Iran Department of Mathematics Mutah University PO Box 7 Al-Karak Jordan

The enhanced homotopy perturbation method (EHPM) is applied for finding improved approximate solutions of the well-known Bagley-Torvik equation for three different cases. The main characteristic of the EHPM is using a stabilized linear part, which guarantees the stability and convergence of the overall solution. The results are finally compared with the Adams-Bashforth-Moulton numerical method, the Adomian decomposition method (ADM) and the fractional differential transform method (FDTM) to verify the performance of the EHPM. © 2009 The Royal Swedish Academy of Sciences.

关键词： Differential equations

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