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OALib Journal期刊

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Safety Management in a Manufacturing Company: Six Sigma Approach  [PDF]
Lateef Ur Rehman Ateekh-ur-Rehman
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.47053
Abstract: The manufacturing company under consideration recorded the high accident rates for last few years. These accidents cause the organization the heavy man-day loss, the production loss and heavy costs of insurance. The objective of health and safety department at the manufacturing company was to set and improve accidents prevention system. The paper presents how does the six-sigma technique will help to evaluate the safety and environmental hazards in performance of organizations? It is observed that the study helped the management to measure, analyze and improve overall safety plan to protect the life and health of the employees.
Field Engineers' Scheduling at Oil Rigs: a Case Study
Ateekh-Ur-Rehman,Y. S. Usmani
Engineering, Technology & Applied Science Research , 2012,
Abstract: Oil exploration and production operations face a number of challenges. Professional planners have to design solutions for various practical problems or issues. However, the time consumed is often very extensive because of the large number of possible solutions. Further, the matter of choosing the best solution remains. The present paper investigates a problem related to leading companies in the energy and chemical manufacturing sector of the oil and gas industry. Each company’s field engineers are expensive and valuable assets. Therefore, an optimized roster is rather important. In the present paper, the objective is to design a field engineers’ schedule which would be both feasible and satisfying towards the various demands of rigs, with minimum operational cost to the company. An efficient and quick optimization technique is presented to schedule the shifts of field engineers.
Jovian Problem: Performance of Some High-Order Numerical Integrators  [PDF]
Shafiq Ur Rehman
American Journal of Computational Mathematics (AJCM) , 2013, DOI: 10.4236/ajcm.2013.33028
Abstract:

N-body simulations of the Sun, the planets, and small celestial bodies are frequently used to model the evolution of the Solar System. Large numbers of numerical integrators for performing such simulations have been developed and used; see, for example, [1,2]. The primary objective of this paper is to analyse and compare the efficiency and the error growth for different numerical integrators. Throughout the paper, the error growth is examined in terms of the global errors in the positions and velocities, and the relative errors in the energy and angular momentum of the system. We performed numerical experiments for the different integrators applied to the Jovian problem over a long interval of duration, as long as one million years, with the local error tolerance ranging from 10-16 to 10-18.

Accuracy and Computational Cost of Interpolation Schemes While Performing N-Body Simulations  [PDF]
Shafiq Ur Rehman
American Journal of Computational Mathematics (AJCM) , 2014, DOI: 10.4236/ajcm.2014.45037
Abstract: The continuous approximations play a vital role in N-body simulations. We constructed three different types, namely, one-step (cubic and quintic Hermite), two-step, and three-step Hermite interpolation schemes. The continuous approximations obtained by Hermite interpolation schemes and interpolants for ODEX2 and ERKN integrators are discussed in this paper. The primary focus of this paper is to measure the accuracy and computational cost of different types of interpolation schemes for a variety of gravitational problems. The gravitational problems consist of Kepler’s two-body problem and the more realistic problem involving the Sun and four gas-giants—Jupiter, Saturn, Uranus, and Neptune. The numerical experiments are performed for the different integrators together with one-step, two-step, and three-step Hermite interpolation schemes, as well as the interpolants.
Multiphase Flow Simulations through Tarbela Dam Spillways and Tunnels  [PDF]
Muhammad Abid, Muftooh Ur Rehman Siddiqi
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.26060
Abstract: Tarbela dam is one of the largest earth filled dam in the world used for power generation and irrigation purposes. Like all reservoirs the sediments inflow in the Tarbela reservoir has resulted in reduction in water storage capacity and is also causing damage to the tunnels, power generating units and ultimately to the plant equipment. This numerical study was performed to predict the flow patterns and characteristics in Tarbela dam. Tunnel 3 and 4 inlets; originally on the bed level were raised in the 3-D model and meshed. Analysis was performed using multiphase flow (water and air) for maximum inflow in the reservoir, i.e., considering summer season and discharging water through different locations, i.e., tunnels and spillways. Pressure, velocities, flow rate and free surface height results obtained were found in good agreement with the analytical and existing results where available. Results show uneven discharge through each gate due to maximum velocity near exits and overall stagnant phenomena of water within the reservoir. Maximum velocity was observed along the spillways outlet. Strong vortex motion was observed near the spillways outlet and tunnel inlets. New design of Tunnel 3 and 4 were suggested to WAPDA in order to decrease the sediment inflow and improvements in design of the spillways were suggested.
Simulation on Single Server & Distributed Environment (It’s Comparison & Issues)  [PDF]
A. Jawwad Memon, Wasi Ur Rehman
World Journal of Engineering and Technology (WJET) , 2013, DOI: 10.4236/wjet.2013.12004
Abstract:

Simulation has become the evaluation method of choice for many areas of distributing computing research. Simulation has been applied successfully for modeling small and large complex systems and understanding their behavior, especially in the area of distributed systems or parallel environment. The aim of my research is to study and qualitative analysis of simulation on a single server & on distributed environment and finding the related issues & its comparison.

Application of the Method of Characteristics to Population Balance Models Considering Growth and Nucleation Phenomena  [PDF]
Shahzadi Mubeen ur Rehman, Shamsul Qamar
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.513178
Abstract:

The population balance modeling is regarded as a universally accepted mathematical framework for dynamic simulation of various particulate processes, such as crystallization, granulation and polymerization. This article is concerned with the application of the method of characteristics (MOC) for solving population balance models describing batch crystallization process. The growth and nucleation are considered as dominant phenomena, while the breakage and aggregation are neglected. The numerical solutions of such PBEs require high order accuracy due to the occurrence of steep moving fronts and narrow peaks in the solutions. The MOC has been found to be a very effective technique for resolving sharp discontinuities. Different case studies are carried out to analyze the accuracy of proposed algorithm. For validation, the results of MOC are compared with the available analytical solutions and the results of finite volume schemes. The results of MOC were found to be in good agreement with analytical solutions and superior than those obtained by finite volume schemes.

Measuring service quality in public and private sector university libraries of Pakistan
Shafiq ur Rehman
Pakistan Journal of Library and Information Science , 2012,
Abstract:
The Impact of Innovation on Customer Satisfaction and Brand loyalty: A Study of the Students of Faisalabad
Khaliq ur Rehman Cheema
International Journal of Management and Organizational Studies , 2013,
Abstract: The competition within the mobile market is increasing day by day in Pakistan. The rapid changes in the technology are the challenge for the companies to satisfy the customers and to get their loyalty through innovative products. Purpose of this study is to investigate the benefits (customer satisfaction and loyalty) and cost (customer dissatisfaction) associated with innovation. These benefits and costs are investigated through analyzing the relationship between the innovation, customer satisfaction, and brand loyalty. The hypothesis was developed through literature review and data was collected through questionnaire from 85 university students, received questionnaires were tested through simple linear regression and correlation for appropriate findings. The results described the significant relationship of innovation with customer satisfaction and brand loyalty. This also showed significant relationship between the customer satisfaction and brand loyalty. The studies on mobile market in Pakistan are conducted at minor level and this study has uniqueness in investigation only students as a mobile users market. This provides the way to marketers in targeting a specific class of mobile consumers, a way to conduct the research on the bases of these variables in other classes of mobile users.
PATIENTS OF HEAD INJURY IN FAISALABAD
Muhammad Naeem ur Rehman
The Professional Medical Journal , 1998,
Abstract: This study was conducted at the department of neurosurgery Allied Hospital Faisalabad where a total of1526 patients of head injury were admitted during four years from January to December 1995. Road TrafficAccident was major cause of head injury in adult age group and fall from height in pediatric age group.Ignorance from law, poor compliance of legislation, had planning of houses were main factors causing headinjury. Gun shot injuries and head injuries due to assault are gradually increasing. The age group withgreatest incidence aged 5-40 years. Mortality in different types of head injuries is also discussed and theinformation gathered from this study would suggest the need to established a head injury preventionprogram in our country. This of course implies major co-operation among the providers of health caredelivery, the medical profession. Legislators and the government at all levels.
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