Volume 7, Issue 3, March 2016

Various Types of Antenna with Respect to their Applications: A Review

Abdul Qadir Khan, Muhammad Riaz and Anas Bilal

School of Information Technology, The University of Lahore, Islamabad Campus

Abstract– Antenna is the most important part in wireless communication systems. Antenna transforms electrical signals into radio waves and vice versa. The antennas are of various kinds and having different characteristics according to the need of signal transmission and reception. In this paper, we present comparative analysis of various types of antennas that can be differentiated with respect to their shapes, material used, signal bandwidth, transmission range etc. Our main focus is to classify these antennas according to their applications. As in the modern era antennas are the basic prerequisites for wireless communications that is required for fast and efficient communications. This paper will help the design architect to choose proper antenna for the desired application.

Keywords— Antenna, Communications, Applications and Signal Transmission

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Comparison Solutions of the Laplace’s Equation by the FDM and BEM with Simple Boundary Conditions

Saeid Panahi and Hassan Ghassemi

Department of Maritime Engineering, Amirkabir University of Technology, Tehran, Iran

Abstract– This paper presents to solve the Laplace’s equation that is many applicable to the engineering problems. Analytical solution may be calculated by separation of variables method. Numerically solutions by two methods i.e. the finite difference method (FDM) and the boundary element method (BEM) are employed to predict the potential characteristics of the domain. In the BEM, the integration domain needs to be discretized into small elements. The boundary integral equation derived using Green’s theorem by applying Green’s identity for any point in the surface. The methods are applied to investigate an example of rectangular domain. The present methods can be extrapolated to other linear homogeneous differential equations. Both types of numerical models are computed and compared with analytical solution. The results obtained agree perfectly with those obtained from exact solution.

Keywords— Laplace’s Equation, Boundary Element Method and Finite Difference Method

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Memory Management: Challenges and Techniques for traditional Memory Allocation Algorithms in Relation with Today's Real Time Needs

Muhammad Abdullah Awais

Virtual University of Pakistan

Abstract– In recent era of computing, applications and operating systems cannot survive without efficient memory management, especially if an application has to be under severe load for undefined long time. Resources must be utilized efficiently to enhance performance. Real time systems require timely and proficient use of memory to perform efficiently otherwise the purpose of real time systems would be lost. It’s the responsibility of operating system to provide the support for memory management through different ways supported as it acts as an interface between the primary resources such as hardware and applications running. Different memory allocation algorithms have been devised to organize memory efficiently in different timestamps according to the needs and scenario of usage yet there are issues and challenges of these allocators to provide full support for real time needs. Memory management in any operating system is governed by different aspects such as on hardware level, application level and especially the operating system level memory management which is our focus. Real time systems require memory on priority otherwise program may crash or may be unresponsive if demanded memory is not allocated with quick response......

Keywords— Memory Management, Dynamic Memory Management, Dynamic Memory Allocation, DMA, Real Time System, Operating System Memory Management, Fragmentation and Memory Blocks

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Analytical Hierarchy Process to Identify and Recommend the Influence of Social Network Sites on Students Academic Performance of College Students

Addisu Mesfin Jemberie and Shruti Patil

Symbiosis International University, Pune, India

Abstract– The purpose of this paper is to Identify and recommend why most students use social sites specially facebook and whatsapp. And use AHP as a mathematical tools is to identify different criterion problems in order to recommend the influence of social sites in Symbiosis International University ,Symbiosis Institute of Technology Students on their academic performance. This AHP result gets from Excel and Matlab application software to identify different questionnaires weight, ratio and different percentage among in different questionnaires. From here I got different results from different questionnaires and summarized to convert weights to percentage all each questionnaires and got their difference by subtract one percentages from others and recommend all depends on the percentage result.

Keywords— Social Network, Identify, Questionnaires and Academic Performance

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