Computer Life (CPL) 

 ISSN: 1819-4818

Delivering Quality Science to the World

Archieves

Volume 2, Issue 1, 2014

 

Page No: 1-9

Resent Development on the Micro Strip Patch Antennas by Increasing Bandwidth of Micro Strip Feeder

Fitchy Z Ezekiel1, Winston Bunyan1 and Dennis M Jonah2

1Centre of Artificial Intelligence, University of Mississippi, MS, USA

2School of Digital Information Processing, New Jersey Institute of Technology, Newark, USA

Abstract: In this paper we are comparing the resent development on the micro strip patch antennas to increase their bandwidth by the different types of methods. First method is a 60 GHz antenna built-up on a Silicon membrane with an upper BCB (Benzo Cyclobuten dielectric) thin film deposit and excited with a U or T-shape micro strip feeder via a dielectric gap. Second method is the compound techniques to broaden the bandwidth of micro strip patch; a new type of stacked micro strip patches antenna which increases the frequency bandwidth obviously is investigated. Now the third one is an open circuited stub connected in shunt with the micro strip feed line. To further enhance the bandwidth of the antenna, an additional shunt stub and multiple shorting pins are incorporated. The design of the aperture coupled antenna with shunt stubs and shorting pins is described.

Keyword: Micro Strip Feeder, Shunt Stub, Shorting Pins

 

Page No: 10-20

A Novel Wide Band Design for Wideband Dual Frequency Application and Wireless Local Area Network

Zachary S Zephaniah and Sid Lambun

Centre of Artificial Intelligence, University of Mississippi, MS, USA

Abstract: A novel wide-band design of a finite ground coplanar waveguide (CPW)-fed monopole antenna is presented for simultaneously satisfying wireless local area network (WLAN) and worldwide interoperability for Microwave Access applications. And simple wideband dualfrequency design of a coplanar waveguide (CPW)-fed triangular planar monopole antenna is proposed.. Both theoretical and experimental results of bandwidths and radiation characteristics for prototypes of the proposed antenna have been presented. The measured −10 dB impedance bandwidth at the lower band (1.71 GHz) is about 240 MHz and that at the upper band (5.62 GHz) reaches about 2 GHz, which cover the DCS1800 and the IEEE 802.11 WLAN standards, respectively. Good monopole-like radiation patterns with antenna gains of 2.3–3.6 dBi and 3.9– 5.6 dBi over the lower and upper bands, respectively, have also been obtained.

Keyword: Monopole Antenna, Wideband, Dual Frequency, Coplanar Waveguide

 

Page No: 21-28

Event Driven Real Time Business Intelligence Using Active Data Warehouse and Data Integration

Fan Wei1, Duankang Xue1 and Qiao Xu2

1Mechanical and Electrical Overall Design Dept., Beijing Institute of Technology, Beijing, China

2School of Navigation Engineering, Naval University of Engineering, Wuhan, China

Abstract: In today’s competitive environment with high consumer expectation, it is decisions that are based on the most current data available that will improve customer relationships, increase revenue, and maximize operational efficiencies. The speed of today’s processing systems has moved classical data warehousing into the realm of real time. The result is real-time business intelligence. Business transactions are fed as they occur to a real-time business-intelligence system that maintains the current state of the enterprise. The RTBI system not only supports the classical strategic functions of data warehousing for deriving information and knowledge from past enterprise activity, but it also provides real-time tactical support to drive enterprise actions that react to immediate events. As such, it replaces both the classical data warehouse and the enterprise application integration (EAI) functions. Real-time business intelligence is also known as event-driven business intelligence. In order to react in real time, a business intelligence system must react to events as they occur– not minutes or hours later. This paper introduces an approach to implement real-time business intelligence using dynamic warehouse.

Keyword: Business Intelligence, Active Data Warehouse, ETL Process, Data Integration

 

Page No: 29-35

Research on Peak-to-Average Power Ratio Reduction Using New Companding Algorithm for Orthogonal Frequency Division Multiplexing Signals Processing

Li Wang

School of Communication and Electronic, Jiangxi Science and Technology Normal University, Nanchang, China

Abstract: One of the challenging issues for Orthogonal Frequency Division Multiplexing (OFDM) system is its high Peak-to-Average Power Ratio (PAPR). It is a major drawback of orthogonal frequency division multiplexing (OFDM) systems. Among the various PAPR reduction techniques, companding transform appears attractive for its simplicity and effectiveness. This paper gives a new approach to PAPR reduction in OFDM using new companding algorithm. Compared with the others, the proposed algorithm offers an improved bit error rate and minimized out-of-band interference while reducing PAPR effectively. Theoretical analysis and numerical simulation are presented.

Keyword: Companding, OFDM, PAPR Effectively, Signal Processing

 

Page No: 36-44

Management on the Resources of Service Provider under Cloud Computing Environment by Virtual Machine and Round Robin Algorithm

Xaviera Mohurimon W, Shrivaly A Eleanor

Department of Network Engineering, University of Nigeria Nsukka, Enugu State, Nigeria

Abstract: Cloud computing is known as digital service delivery over the Internet by several applications which are carried out by computer systems in distributed datacenters. It supplies a high performance computing facilities which allow shared computation and storage over long distances. To properly manage the resources of the service provider we require balancing the load of the jobs that are submitted to the service provider. Load balancing is required as we don’t want one centralized server’s performance to be degraded. In this paper, we present Round Robin Algorithm for efficient load balancing in cloud environment.

Keyword: Cloud Computing, Load Balancing, Virtual Machine, Round Robin Algorithm

 

Page No: 45-49

PIE-variant Images Applied in Face Recognition with Illumination and Expression Variations Using SIFT Features

Weihua Huang and Dong Lin

School of Electronics and Information Engineering, Changchun University of Science and Technology, Changchun, China

Abstract: Prior research has shown that under the illumination controlled and user cooperative conditions, nearly all of face recognition method perform very well, but when it comes to the variant illumination, pose and expression (PIE) conditions, the performance of these methods degrade seriously. Face recognition in variant PIE conditions is one of the most challenging problem in this field. In this paper, a method based on SIFT features is used to research on face recognition in variable PIE conditions. Three professional PIE-variable face database are used to experiment the performance of SIFT method. The experiment results show the huge potential of SIFT method in application to face recognition in variable PIE conditions.

Keyword: PIE Conditions, Face Recognition, Sift Feature, Matching

 

Page No: 50-58

Knowledge Active Push System Optimization and the Multi-dimensional Knowledge Management Based on Amnestic Vector Model

Zhenghua Li1, Qun Zheng1 and Meng Yu2

1School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China

2School of Information Engineering, North China Electric Power University, Baoding, China

Abstract: A knowledge push framework based on analysis of the behavior, task and role of a designer was proposed, providing excellent ways for solving the problems of low accuracy, complicated operation, low efficiency and difficulty in acquiring knowledge through retrieval. A knowledge active push system was realized through forgotten attenuation, similarity filtering and other key methods, playing a good supporting role to designers and greatly reducing the time required for designing.

Keyword: Knowledge Management; Knowledge Push; Forgotten Attribute; Knowledge Engineering; Similar Filter

 

Page No: 59-65

Analysis of Shielding Effectiveness of Metal Layer in the Time Varying Change Magnetic Field for Undersea Contactless Power Transmission System

Hui Wang

School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, China

Abstract: A contactless power transmission system work based on high-frequency electromagnetic induction, companying amount of leakage magnetic flux spread outside the coupling structure and inducing power loss in the metal shell. It is necessary to design shielding mechanism to weaken the influence of leakage magnetic flux. This paper analyzed the shielding effectiveness of metal layer in the time-varying change magnetic field, and revealed the shielding function of a thin copper sheet between cores and shells. By using FEM simulation, distributions of magnetic intensity and eddy current density were imaged and compared to demonstrate the shielding effectiveness. Finally, a prototype of coupling structure with shielding sheets was proposed and tested. The testing results proved the significant affection of shielding sheet on improving the system’s transferring ability.

Keyword: Contactless Power Transmission, Shielding Analysis, FEM Simulation

 

Page No: 66-71

Designing and Optimizing of a New Algorithm for the Wallace Tree Multiplier Based on Carry Look Ahead Adder

Cherylly Nathaniei and Conositance M Maltzo

School of Electronic Engineering, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya

Abstract: This paper deals with design and synthesis of 8x8 Wallace Tree Multiplier. Multipliers form the heart of DSP operation and determine the performance of general-purpose microprocessors and other devices where multipliers are highly involved. However, addition is a fundamental operation of multiplier and the question is how the addition operation is performed in order to improve the speed of the multiplier. The paper proposed a new algorithm for Wallace tree multiplier as it is an efficient hardware implementation of a circuit that multiplies two integers. It consists of three stages: In the first stage, the partial product matrix is generated, and in the second stage, the partial product matrix is reduced to a height of two through taking any three wires with the same weights and input them into a full adder in the final stage, these two rows are combined using a carry look ahead adder. But, if there are two wires of the same weight left, input them into a half adder or if there is just one wire left, connect it to the next layer. The work resulted in reduction of a number of adders, which in turn resulted in reduction of delay (logic gate delay & route delay).

Keyword: Multiplier, Multiplicand, Wallace Tree, Carry Look Ahead Adder

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