September2011

1) Optimal Generation Scheduling using Genetic Algorithm
(pp. 300-303)

Authors: M. F. Kotb, A. El-Fergany

Abstract - This  article  presents  an  application  of  Genetic Algorithm  (GA)  to  solve  classic  Economic  Dispatch  (ED) problems. The operation of generating unit capacity constraints and transmission losses are considered. Total fuel cost saving is achieved, indicated and proved by numerical simulation results. Several cases were tested and verified, among of them, two cases of 15- generating units and 6-generating units including lines losses were simulated and compared with previous reported researches.

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2) Optimal Design of Axial Flux Permanent Magnet Generator for Hybrid Electric Vehicle.
(pp. 304-308)

Authors: Prof. B.S. Dani, Prof. M.D.Khardenvis, Prof. V.M.Jape

Abstract - The axial flux permanent magnet machine is an attractive alternative to radial flux machines in wind turbine applications. The axial flux configuration is amenable to the low-speed, high-torque operation of a direct drive wind energy system. Axial flux permanent magnet (PM) machines are being developed for many applications due to their attractive features. An extensive literature exists concerning the design of a variety of types of axial flux PM machines. The objective of this paper is to optimize the design since design formulae involves various parameters and constraints. Modern day approach of Artificial Intelligent technique is also introduced as an effective design optimization method. Cost and qualitative parameters can be segmented easily with such approach. Case study design is discussed and effect of varying design parameters on performance and economy is concluded in the paper. Efforts are proposed and also discussed to minimize losses, improved efficiency and torque during design process.  

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3) Effect of Crossed Magnetic Field on Ozone Production in Air
(pp. 309-312)

Authors: Z. Buntat, I. R. Smith and N. A. M. Razali

Abstract - An application of magnetic field, B to a discharge chamber under transverse electric field, E  is studied, with the objective to view the effect of magnetic  field to the electrons in a plasma. Theory of gas discharge stated that this configuration will create a helical motion to electrons due to gradient drift or gyration. Experimental result from previous research showed, however that this magnetic field has no effect to corona current, in contrast to the theory that the helical motion will increase the ionization collision process and cause more electron emissions. To verify the result, application of B effect to ozone chamber is constructed under AC and pulsed power supply, and the result shows that the B does not influence gas discharge characteristic agreeing with the result from previous author.

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4) A NOVEL ROUTING STRATEGY FOR AD HOC NETWORKS WITH SELFISH NODES
(pp. 313-318)

Authors: Shailender Gupta Chander Kumar

Abstract - To secure the data in the ad hoc network the intermediate nodes with in a route are created on the basis of their currently known reputation (trust) index. However, a node which was earlier trust worthy may no longer to be so as it becomes selfish due to loss of power. This selfish behavior problem is quite common in ad hoc networks and the literature contains many strategies to deal with them. This paper presents a novel routing strategy to deal with such nodes. The strategy assumes that the selfish nodes are not malicious and obligated to speak truth about their current energy level.

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5) Periodically Loaded Rectangular Waveguide with FSS Strip Layer Supporting Wideband Backward Wave
(pp. 319-322)

Authors: A.Akbarzadeh-Jahromi, M.Tayarani, and M.Khalaj-Amirhosseini

Abstract - In this paper, a negative refractive index guided-wave structure is realized using a rectangular waveguide loaded with H-shaped frequency selective surface (FSS) strip layer. This new structure shows wideband double negative (DNG) and backward wave properties. Indeed these properties can be controlled well over wide frequency range with control of physical dimension of the structure. Using the FSS, two wideband band-pass filter proposed which are inexpensive to fabricate due to using printed layer which are ideal for mass production.

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6) Comparative Analysis between Various Types of Corrugated Profiled Horns
(pp. 323-325)

Authors: S. H. Mohseni Armaki, R. Kazemi, F. H. Kashani and M. Fallah

Abstract - A parametric study is performed to the various types of conical corrugated profiled horn antennas. The obtained simulated results are presented graphically to show the features of the horns in terms of gain, cross polarization return loss, phase center and radiation patterns. The objective of this paper is to simulate some profiles and compare results with corrugated linear profiled horn as reference antenna.

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7) The Information Economy and Information and Communication Technology
(pp. 326-329)

Authors: Mohsen Gerami

Abstract - Information is a key strategic asset and Information assets are perhaps the most important type of asset in the knowledge-based economy. The Information economy mainly defined by the extension of information and communication technologies. The rapid growth of telecommunications and information technologies in the past decade is shifting the global market from a technology-based economy to an information-based economy. Countries with highly developed telecommunications infrastructure can adjust to this rapid change and take advantage of the enormous new opportunities. This paper describes some of the impacts of the information and communication technologies on the information economy.

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8) Frequency Assignment for Cellular Mobile Systems Using a Hybrid Tabu search
(pp. 330-334)

Authors: Jamal Elhachmi and Zouhair Guenoun

Abstract - This paper presents a new algorithm for solving the frequency assignment problem in cellular mobile systems. The proposed algorithm is based on a Taboo search starting with a sequential local search method. Instead of using a minimum number of frequencies and reusing them a maximum number of times, our algorithm assembles to maximum the frequencies while avoiding deadlock. This algorithm introduces a powerful sequential local search method to start with an initial solution respecting all constraints, and minimizing the costs of employment. This initial solution is used to construct a global solution by permutation of all frequencies of a constraint link in its frequency domain in order to obtain the smallest maximum frequency used and the overall cost of such a solution. The algorithm reduces both the search space, the order of variables and values and avoids cycles through by the use of a temporary Taboo list. Our approach has been tested on standard benchmark problems called Philadelphia benchmarks of frequency assignment problem. The results obtained are equivalent to those of current methods. Moreover, our approach shows more efficiency in terms of flexibility and autonomy.

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