Volume 5, Issue 7, July 2014

Optical Filtering along with Pre-emphasis Driver in Long-haul Optical Networks

M. Venkata Sudhakar, Y. Mallikarjuna Reddy and B. Prabhakara Rao

Department of Electronics and Communication Engineering, J.N.T. University, Kakinada, AP, India
Department of Electronics and Communication Engineering, Vasireddy Venkatadri Institute of Technology, Guntur, AP, India

Abstract– This paper proposes a novel technique to optimize the performance of the optical link by using the pre-emphasis driver and optical filtering scheme in vertical cavity surface emitting laser (VCSEL) based transmitters. Optical band pass filters (OBPFs) are employed to provide optimal filtering of signals at VCSEL output. Analysis of optical system is performed for both Butterworth and super-Gaussian OBPFs. We are able to generate a non-return to zero (NRZ) signal from 10 Gb/s VCSEL based transmitter for 160 km error-free transmission with sensitivity of -27.2 dBm at bit error rate (BER) of 10-9. The obtained results validate that with the application of pre-emphasis driver the eye-opening is improved without the necessity of any dispersion-compensation schemes. Numerical results are analyzed and compared between the transmitter with and without pre emphasis techniques.

Keywords— Single Mode Fiber, Bit Rate, Dispersion and Optical Filter

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Corporate Governance Practices and Firms Performance: A Case of Banking Sector of Pakistan

Ali Raza Arshaad, Sohail Yousaf, Kanwal Shahzadi and Earsa Mustansar

Department of Management Sciences, University of Gujrat, Pakistan

Abstract– In this paper, we examine the relationship between corporate governance practices and firms performance banking sector of the Pakistan. In this paper, we apply the Mann-Whitney U-test for the comparison of the 3 commercial banks that practice good corporate governance and 3 commercial banks that did not practice good corporate governance. We use four financial ratios for measure the performance of the banks. The ratios which are used in paper are ROA (Return on asset), ROE (Return on equity), EPS (Earning per share) and PM (Profit margin). The time period for which financial performance is measured is from 2008-2012 at end it is concluded that there is no significant difference in the performance between commercial banks that practice good governance and commercial banks that practice weak governance.

Keywords— Corporate Governance Practices, Banks and Mann U Whitney Test

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Optimization of Process Conditions for the Dephosphorization of Iron Ore Using Sulphuric Acid

T.O. Chime

Department of Chemical Engineering, Enugu State University of Science and Technology Enugu, Nigeria

Abstract– An investigation has been carried out in this study to optimize the process variables for the dephosphorization of an iron ore using sulphuric acid. A 23 full factorial of standard central composite design was used to develop a model. The model was optimized using MATLAB. The surface responses of the plots show that particle size, leaching time and sulphuric acid concentration interacted effectively to enhance the degree of dephosphorization. The results show that 99.87% of dephosphorization was obtained at optimum values of 120 minutes leaching time, 10 microns particle size and concentration of 0.2M. The iron loss during the chemical leaching was less than 4%. It is inferred that dephosphorization using sulphuric acid is feasible under the prevailing conditions.

Keywords— Dephosphorization, Surface Response, Optimization, Chemical Leaching and Central Composite Design

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Cloud Computing Services for the Healthcare Industry

Zarina Zafar, Shahid Islam, Muhammad Shehzad Aslam and Muhammad Sohaib

Department of Computer Science & Engineering, University of Engineering & Technology, Lahore (Gujranwala Campus-RCET)

Abstract– Healthcare sector is facing a number of challenges like high IT costs, more processing power, ubiquitous access, scalability and demand for interoperability etc. Present health technology is deficient to address these challenges. Cloud computing having qualities such as multi-tenancy, flexibility and metered delivery appears a viable approach. This paper reviews the state-of-the-art cloud computing paradigm, presents a cloud driven healthcare service model, and explores different services of cloud for health industry. Paper also shed light on the constraints associated with cloud adoption for healthcare. Paper concludes that healthcare stakeholders can take advantage of cloud services to offer novel patient care applications, reduce costs and management, and ultimately provide quality healthcare services.

Keywords— Cloud Computing, Health Care, Challenges and Services

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