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A novel fuzzy approach to improve near neighborhood allocation algorithm in DDB

A novel fuzzy approach to improve near neighborhood allocati...

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ACS/IEEE International Conference on computer Systems and Applications

作者： Reza Basseda Maseud Rahgozar Database Research Group Control and Intelligent Processing Center of ExcellenceSchool of Electrical and Computer Engineering Faculty of Engineering University of Tehran Tehran Iran Database Research Group Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering Faculty of Engineering University of Tehran Tehran Iran

Since accurate migrations of data fragments in distributed database systems, known dynamic fragment allocation, play an important role in amendment of distributed database performance, several algorithms each of which shows different performance in various conditions, have been proposed to improve dynamic fragment allocation in distributed database systems. In this paper, we are going to propose a novel algorithm which is able to detect oscillation conditions and provides a solution to prevent redundant fragment migration. Proposed algorithm, an improved version of the previous near neighborhood allocation (NNA) algorithm, uses a fuzzy inference engine to detect oscillations in fragment request and ignore fragment migrations under these conditions. Our results indicate that, fuzzy based clearly improved the performance of distributed database systems in which oscillation conditions are more probable. This algorithm, providing data clustering, is very suitable for DDBS in the networks, with heavy loads, and frequent requests for data fragments coming from different sites.

关键词： Database systems Distributed databases Inference algorithms Costs Heuristic algorithms Fuzzy systems Data engineering Clustering algorithms Algorithm design and analysis Fuzzy control

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Attenuation of ultrasound pressure fields described via contrast source formulation

Attenuation of ultrasound pressure fields described via cont...

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2009 IEEE International Ultrasonics Symposium, IUS 2009

作者： Demi, L. Verweij, M.D. Huijssen, J. De Jong, N. Van Dongen, K.W.A. Laboratory of Acoustical Imaging and Sound Control Faculty of Applied Sciences Delft University of Technology Netherlands Laboratory of Electromagnetic Research Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Netherlands Laboratory of Experimental Echocardiography Erasmus Medical Center Rotterdam Netherlands

ISBN: (纸本)9781424443895

Experimental data reveal that attenuation is an important phenomenon in medical ultrasound. The phenomenon is of particular importance for applications based on nonlinear propagation, as the higher frequency components of the pressure field generally experience greater attenuation. Therefore a method that is capable of modeling attenuation accurately is essential. In this paper we present a method to model attenuation via a contrast source formulation. We compare the obtained results with a version of the INCS method in which the attenuation is included in the Green's function. Both results are in excellent agreement with each other. ©2009 IEEE.

关键词： Ultrasonics

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Mobile agent watermarking (MAW): Security properties and attacks revisited 09

Mobile agent watermarking (MAW): Security properties and att...

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6th International Conference on Frontiers of Information Technology, FIT '09

作者： Khan, Abid Niu, Xiamu Anwar, Waqas Ahmed, Mansoor Nawaz Khan, Ali Department of Computer Science COMSATS Institute of Information Technology Islamabad Pakistan Information Security Technique Research Center Harbin Institute of Technology Shenzhen Graduate School China Department of Computer Science COMSATS Institute of Information Technology Abbottabad Pakistan Department of Electrical Engineering COMSATS Institute of Information Technology Lahore Pakistan

ISBN: (纸本)9781605586427

Providing integrity of execution is considered as the most challenging problem in Mobile Agent System (MAs). Mobile agent watermarking (MAW) is a technique that attempts to provide integrity of execution to a mobile agent. We discuss the attacks against MAW technique and how the security properties for MAs data integrity are fulfilled. We try to model the behavior of a malicious host by launching a series of passive attacks against mobile agent and then see to what extent the security properties for mobile agent can be achieved. The experimental results suggest that MAW framework can be used to protect the computations results of mobile agents Copyright 2009 ACM.

关键词： Mobile agents

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Optimal quarantining of wireless malware through power control

Optimal quarantining of wireless malware through power contr...

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Information Theory and Applications Workshop, ITA

作者： M. H. R. Khouzani Eitan Altman Saswati Sarkar School of Electrical and Systems Engineering University of Pennsylvania USA The French national Institute of research in computer science and control INRIA France

The topic of malware propagation in mobile wireless networks is gaining momentum among the research community, as actual vulnerabilities are revealed through recent outbreaks of worms. We introduce a defense strategy that quarantines the malware by reducing the communication range. This counter-measure faces us to a trade-off: reducing the communication range suppresses the spread of the malware, however, it also negatively affects the performance of the network as the end-to-end communication delay increases. We model the propagation of the malware as a deterministic epidemic. Using an optimal control framework, we select the optimal communication range that captures the above trade-off by minimizing a global cost function. Using Pontryagin's Maximum Principle, we derive structural characteristics of the optimal communication range as a function of time for two different cost functions.

关键词： Power control Mobile communication Wireless networks computer worms Optimal control computer networks Power engineering and energy Systems engineering and theory Mobile computing Cost function

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Teachers need robotics-training, too 37

Teachers need robotics-training, too

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SEFI 37th Annual Conference 2009

作者： Burr, Barbara Jeschke, Sabina Knipping, Lars Scheurich, Jörg Vollmer, Ursula Wilke, Marc University of Stuttgart Department for Computer Science Electrical Engineering and Information Technology Center of Information Technologies Allmandring 30a Stuttgart70553 Germany University of Stuttgart Department for Computer Science Electrical Engineering and Information Technology Institute of Information Technology Services Allmandring 30a Stuttgart70553 Germany Technische Universität Berlin School of Mathematics and Natural Sciences Center for Multimedia in Education and Research Straße des 17. Juni 136 Berlin10623 Germany

Since robotics holds a special fascination among all the technological fields - due to its cross-disciplinary approach as well as its popularity through movies and literature - this field is attracting even the interest of pupils and students who are normally more reserved and cautious towards technological areas. In particular, practical experiences have shown that out of all the different technological areas robotics has a very high motivation impact on women. Thus, robotics can also be utilized as an instrument to bridge the gender gap in technological areas and fields of natural sciences. However, so far the majority of projects and initiatives focus on the instruction of the pupils and students themselves which naturally leads to restrictions concerning the scope of application. In order to enhance the impact factor, the integration of "multipliers", in particular the "educators" in elementary schools, middle schools und high schools - and even in the kindergarten - is an important task. Within this paper, we describe a concept for teaching teachers how to implement robotics curriculum into today's classrooms which is currently under development at the University of Stuttgart and the Technische Universität Berlin.

关键词： Robotics

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PH control of penicillin fermentation process using predictive approach

PH control of penicillin fermentation process using predicti...

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作者： Ashoori, Ahmad Moshiri, Behzad Ramezani, Amin Bakhtiari, Mohammad Reza Khaki-Sedigh, Ali Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran Iran Iranian Research Organization for Science and Technology Iran Department of Electrical Engineering K.N. Toosi University of Technology Tehran Iran Box No. 83 2205 Lower Mall Vancouver BC V6T 1Z4 United States

Bioprocesses which are involved in producing different pharmaceutical products may conveniently be classified according to the mode chosen for the process: cither batch, fed-batch or continuous. From the control engineer's viewpoint they are fed-batch processes, which present the greatest challenge to get a pure product with a high concentration. Complicated dynamics, nonline-arity and non-stationarity make controlling them a very delicate task. pH control of bioreactors has been an interesting problem from both implementation and controller design points of view. This is particularly true if the complex microbial interactions yield significant nonlinear behavior. When this occurs, conventional control strategies may not succeed and more advanced strategies need to be suggested. This paper discusses model predictive control (MPC) based on a detailed unstructured model for penicillin production in a fed-batch fermentor. The approach used here is to use quadratic cost function for pH regulation, while taking into account control signal fluctuations in the optimization block. The result of applying the obtained controller and also its sensitivity to disturbance have been displayed and compared with the results of an auto-tuned PID controller used in previous works. The merit of this method is its low computational cost of solving the optimization problem, while leading to a closed form controller as well.

关键词： Model predictive control

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Six-DOF trajectory tracking for payload directed flight using trajectory linearization control

Six-DOF trajectory tracking for payload directed flight usin...

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作者： Adami, Tony M. Zhu, J. Jim Ishihara, Abraham K. Yeh, Yoo-Hsiu Ippolito, Corey A. Avionics Engineering Center Ohio University Athens OH 45701 United States Silicon Valley Campus Carnegie Mellon University Moffett Field CA 94035 United States NASA Ames Research Center Moffett Field CA 94035 United States School of Electrical Engineering and Computer Science Ohio University Athens United States NASA Ames Research Center Intelligent Systems Division United States

ISBN: (纸本)9781563479717

Payload Directed Flight (PDF) calls for agile and precise tracking control of an air vehicle that poses significant challenges to current flight control techniques. To support the goals of NASA's Payload Directed Flight program, Trajectory Linearization control (TLC) can provide robust, agile tracking of online-generated near-optimal trajectories for a wide variety of applications. In this paper we describe a 6DOF tracking controller design for a generic general aviation (GA) aircraft dynamics model using TLC. Initial design verification is presented via simulation results. Copyright © 2009 by J. Jim Zhu.

关键词： NASA

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Optofluidic packaging of silicon microchips for applications in light emitting devices

Optofluidic packaging of silicon microchips for applications...

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International Conference on Solid State Sensors and Actuators (TRANSDUCERS)

作者： S. E. Chung S. A. Lee J. Kim S. Kwon School of Electrical Engineering and Computer Science Inter-university Semiconductor Research Center Seoul National University Seoul South Korea

We demonstrate optofluidic packaging of silicon microchips using image processing-based optofluidic maskless lithography (IP-OFML). Optofluidic maskless lithography (OFML) is a dynamic photopolymerization technique for free-floating microstructures within a fluidic channel using a MEMS spatial light modulator. OFML via computer vision-aided image processing enables individual polymer packaging of each microdevice for protection. Furthermore, our technology is applicable to phosphor coating of light emitting diodes (LEDs).

关键词： Packaging Silicon Lithography Light emitting diodes Application software Fluid dynamics Microstructure Fluidic microsystems Microfluidics Micromechanical devices

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Improvement on erase characteristics of SONOS flash memory by bandgap engineering of tunnel oxide

Improvement on erase characteristics of SONOS flash memory b...

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IEEE International Workshop Integrated Reliability

作者： Dong Hua Li Byung-Gook Park Inter-university Semiconductor Research Center School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea

We comparatively analyze the erase speed and long-term reliability between the conventional SONOS flash memory and the bandgap engineered SONOS flash memory devices. As a result, the bandgap engineered SONOS device is indeed proven to provide faster erase speed and better long-term data retention characteristics than the conventional SONOS device.

关键词： SONOS devices Flash memory Photonic band gap Silicon Reliability engineering CMOS technology Substrates Electrons Charge carrier processes computer science

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Application of neuro-fuzzy models in short term electricity load forecast

Application of neuro-fuzzy models in short term electricity ...

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International CSI computer Conference, CSICC

作者： A. R. Koushki M. Nosrati Maralloo C. Lucas A. Kalhor Department of Computer Engineering Science and Research Branch Islamic Azad University Tehran Iran Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran Iran

One of the important requirements for operational planning of electrical utilities is the prediction of hourly load up to several days, known as short term load forecasting (STLF). Considering the effect of its accuracy on system security and also economical aspects, there is an on-going attention toward putting new approaches to the task. Recently, neuro fuzzy modeling has played a successful role in various applications over nonlinear time series prediction. This paper presents a neuro-fuzzy model for the application of short-term load forecasting. This model is identified through locally liner model tree (LoLiMoT) learning algorithm. The model is compared to a multilayer perceptron and Kohonen classification and intervention analysis. The models are trained and assessed on load data extracted from EUNITE network competition.

关键词： Predictive models Load forecasting Multilayer perceptrons Economic forecasting Power system modeling Power generation economics Fuel economy Artificial neural networks Power system economics Temperature

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