Chian-Son Yu

A robust optimization model for stochastic logistic problems

The main di

A GP-AHP Method for solving group decision-making fuzzy AHP Problems

culty of a logistic management problem is in the face of uncertainty about the future. Since many logistic models encounter uncertainty and noisy data in which variables or parameters have the probability of occurrence, a highly promising technique of solving stochastic optimization problems is the robust programming proposed by Mulvey et al. (Operations Research 43(2) (1995a) 264}281) and Mulvey and Ruszczynski (Operations Research 43 (3) (1995b) 477}490). However, heavy computational burden has prevented wider applications in practice. In this study, we reformulate a stochastic management problem as a highly e

Causes influencing the effectiveness of the post‐implementation ERP system

cient robust optimization model capable of generating solutions that are progressively less sensitive to the data in the scenario set. The method proposed herein to transform a robust model into a linear program only requires adding n#m variables (where n and m are the number of scenarios and total control constraints, respectively). Whereas, the current robust programming methods proposed by Mulvey et al., Mulvey and Ruszczynski and Bai et al. (Management Science 43 (7)(1997) 895}907) require adding 2n#2m. Two logistic examples, logistic management problems involving a wine company and an airline company, demonstrate the computational e

Construction and validation of an e‐lifestyle instrument

ciency of the proposed model. ( 2000 Elsevier Science B.V. All rights reserved.

A Review of Deterministic Optimization Methods in Engineering and Management

The analytic hierarchy process (AHP) elicits a corresponding priority vector interpreting the preferred information from the decision-maker(s), based on the pairwise comparison values of a set of objects. Since pairwise comparison values are the judgments obtained from an appropriate semantic scale, in practice the decision-maker(s) usually give some or all pair-to-pair comparison values with an uncertainty degree rather than precise ratings. By employing the property of goal programming (GP) to treat a fuzzy AHP problem, this paper incorporates an absolute term linearization technique and a fuzzy rating expression into a GP-AHP model for solving group decision-making fuzzy AHP problems. In contrast to current fuzzy AHP methods, the GP-AHP method developed herein can concurrently tackle the pairwise comparison involving triangular, general concave and concave-convex mixed fuzzy estimates under a group decision-making environment.

A global optimization method for nonconvex separable programming problems

Purpose – This article aims to find a chain of causal relations affecting the operating effectiveness of the implemented enterprise resource planning (ERP) system instead of focusing on either the evaluation of software/vendors/consultants or critical successful factors (CSF) identification for ERP implementation, a course followed by the dominant ERP literature.Design/methodology/approach – This article is a process‐oriented approach and aims to give a moving picture of how one step affects another step from pre‐implementation stage, to during‐implementation stage, and to post‐implementation stage.Findings – A significant insight learned from this study is that end‐users across the organization must be educated from the onset of ERP implementation. Although education is a corner‐stone of ERP implementation, the user training is usually only emphasized and the courses are centered on computer/system operation rather than on understanding the ERP concept and spirit.Originality/value – This article may be i...

Influences on Taiwanese SME E-Marketplace Adoption Decisions

Purpose – The purpose of this paper is to construct and validate an e‐lifestyle scale.Design/methodology/approach – Through a two‐step approach of exploratory factor analysis (EFA), the generated two EFA solutions reveal the adequacy of the generated seven components underlying the 1,135 responses. By using the other 793 respondents sampling from the same population, confirmatory factor analysis (CFA) examines and supports the fitness of the overall structure.Findings – The empirical results show that the 39 items of the e‐lifestyle scale were grouped into seven distinct components. These components represented seven principal factors that significantly influence and shape individual e‐lifestyles.Research limitations/implications – This investigation merely represents a starting point in e‐lifestyle research. To enhance the validity and generalization of the scale proposed in this study, further cross‐cultural validation is necessary.Practical implications – Beyond constructing and validating an e‐lifesty...

Assessing and differentiating the quality of Internet-based services: a case of online banking in Taiwan

With the increasing reliance on modeling optimization problems in practical applications, a number of theoretical and algorithmic contributions of optimization have been proposed. The approaches developed for treating optimization problems can be classified into deterministic and heuristic. This paper aims to introduce recent advances in deterministic methods for solving signomial programming problems and mixed-integer nonlinear programming problems. A number of important applications in engineering and management are also reviewed to reveal the usefulness of the optimization methods.

A fuzzy multiobjective program with quasiconcave membership functions and fuzzy coefficients

Abstract Conventional methods of solving nonconvex separable programming (NSP) problems by mixed integer programming methods requires adding numerous 0–1 variables. In this work, we present a new method of deriving the global optimum of a NSP program using less number of 0–1 variables. A separable function is initially expressed by a piecewise linear function with summation of absolute terms. Linearizing these absolute terms allows us to convert a NSP problem into a linearly mixed 0–1 program solvable for reaching a solution which is extremely close to the global optimum.

Comments on “fuzzy programming with nonlinear membership functions...”

Abstract E-marketplaces began to receive considerable interest in the late 1990s, and after going through a gloomy period from 1999 through 2002, e-marketplaces now appear set to make a major contribution to the business-to-business (B2B) e-commerce market. However, in the past years, the rate of adoption of e-marketplaces among Taiwanese small and medium enterprises (SMEs) has remained lower than expected. This low adoption rate is particularly difficult to understand given that the Taiwanese government has constructed one of the highest quality national information infrastructures in the world, and has encouraged SMEs to seek global trade opportunities over time. Accordingly, this work explores the influences on Taiwanese SME decisions regarding e-marketplace adoption.