There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

In this Chapter, we imagine a decision maker (or a group of experts) trying to establish or examine fair procedures to combine opinions about alternatives related to different points of view.

Multiple criteria decision making

Investigation of heat transfer in square porous-annulus

Viscous dissipation and radiation effects on MHD natural convection in a square enclosure filled with a porous medium

The current work highlights the effect of radiation on the conjugate heat and mass transfer in a square porous cavity having a solid wall. The solid wall is placed at the center of cavity. The left surface of cavity is maintained at higher temperature Tw and concentration Cw whereas the right surface is maintained at Tc and Cc such that Tw>Tc and Cw>Cc. The top and bottom surfaces are adiabatic. The governing equations are solved with the help of finite element method by making use of triangular elements. The results are discussed with respect to two different heights of solid wall inside the porous medium along with the radiation parameter.

Influence of radiation on double conjugate diffusion in a porous cavity

Free Convection And Radiation For A Vertical Wall With Varying Temperature Embedded In A Porous Medium

Steady two-dimensional free convection flow due to combined effect of radiation and convection through a porous medium bounded by a vertical infinite plate is considered. The behaviour of Darcy and non-Darcy flow is investigated. The flow of water through different porous media under different environmental conditions is discussed. Effect of four non-dimensional parameters, i.e. Prandtl number (Pr), modified Grashof number (G), permeability parameter (K) and radiation parameter (N) has been studied. Effect of these parameters on Nusselt number is analysed. Copyright © 2005 John Wiley & Sons, Ltd.

Free convection and radiation characteristics for a vertical plate embedded in a porous medium

The maximin criterion chooses the best alternative among the worst possibilities. In portfolio investment, the portfolio is chosen to maximize the minimum return over all past observation periods for a given level of return. The objective of this paper is to determine the portfolio composition based on maximin principle during the economic crisis in Malaysia from the year 1997 to 2001. The determined selection was found to consist of stocks of different weights. The portfolio mean return is found to be higher than the aspired target return.

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Portfolio Decision Analysis with Maximin Criterion in the Malaysian Stock Market

Efficiency evaluation is vital as it is able to determine the financial performance of the companies. Efficiency describes how well the companies in utilizing their inputs to generate outputs. The objective of this study is to propose a financial ratio based Data Envelopment Analysis (DEA) model to evaluate and compare the efficiency of listed technology companies in Malaysia for the period of 2011–2015. In DEA model, the efficiency is defined as the ratio of sum-weighted outputs to sum-weighted inputs. In this study, LINGO software is used to solve the DEA model. The results of this study indicate that ELSOFT, GTRONIC, KESM, MPI and VITROX are ranked as efficient technology companies in Malaysia. Besides that, the potential improvement for each inefficient company can be identified based on the benchmark efficient companies. This study is significant because it helps to identify the efficient technology companies which can serve as benchmarks to other inefficient companies for further improvement. Moreover, it is a pioneer study of proposing DEA model with financial ratio to evaluate and compare the efficiency of technology companies in Malaysia.

Improvement on the Efficiency of Technology Companies in Malaysia with Data Envelopment Analysis Model

Financial ratio and risk are important financial indicators to evaluate the financial performance or efficiency of the companies. Therefore, financial ratio and risk factor are needed to be taken into consideration to evaluate the efficiency of the companies with Data Envelopment Analysis (DEA) model. In DEA model, the efficiency of the company is measured as the ratio of sum-weighted outputs to sum-weighted inputs. The objective of this paper is to propose a DEA model by incorporating the financial ratio and risk factor in evaluating and comparing the efficiency of the financial companies in Malaysia. In this study, the listed financial companies in Malaysia from year 2004 until 2015 are investigated. The results of this study show that AFFIN, ALLIANZ, APEX, BURSA, HLCAP, HLFG, INSAS, LPI, MNRB, OSK, PBBANK, RCECAP and TA are ranked as efficient companies. This implies that these efficient companies have utilized their resources or inputs optimally to generate the maximum outputs. This study is significant because it helps to identify the efficient financial companies as well as determine the optimal input and output weights in maximizing the efficiency of financial companies in Malaysia.

https://iopscience.iop.org/article/10.1088/1742-6596/995/1/012021/pdf

Lam Weng Siew

Papers

Free Convection And Radiation For A Vertical Wall With Varying Temperature Embedded In A Porous Medium

Free convection and radiation characteristics for a vertical plate embedded in a porous medium

Portfolio Decision Analysis with Maximin Criterion in the Malaysian Stock Market

Improvement on the Efficiency of Technology Companies in Malaysia with Data Envelopment Analysis Model

Investigation on the Efficiency of Financial Companies in Malaysia with Data Envelopment Analysis Model