Hongsuk Yang
Seoul National University
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Publication
Featured researches published by Hongsuk Yang.
International Journal of Production Research | 2014
Soojung Oh; Hongsuk Yang; Soo Wook Kim
Firms need to find a proper fit between their own information technology (IT) capabilities and IT systems in order to enhance performance. Thus, the purpose of this paper is to examine the moderating effect of certain e-procurement system types on the relationship between IT capabilities and firm performance. Moderated regression analysis is used to test for interaction effects of IT capabilities, including collaboration capability and dynamic capability, and e-procurement system types including, E-market and Extranet. Data of 142 Korean manufacturing firms are collected and used in the analysis. There is a stronger effect when relationships between IT capability and firm performance are considered with the involvement of other resource such as e-procurement system type. When e-procurement has a minimum-information sharing function and a high market-making function, collaboration capability had a greater contribution on financial performance. On the other hand, when an e-procurement system has limited search functions, the dynamic capability shows a greater contribution to financial performance. The result of this paper gives a strategic view by providing a new perspective regarding the suitability between e-procurement being used by itself and the IT capability necessary for this.
international conference on future generation information technology | 2009
Young-Chae Hong; Dong-Kyu Kim; Seung-Young Kho; Soo Wook Kim; Hongsuk Yang
This study proposes a new model to simulate tandem tollbooth system in order to enhance planning and management of toll plaza facilities. A discrete-event stochastic microscopic simulation model is presented and developed to evaluate the operational performance of tandem tollbooth. Traffic behavior is represented using a set of mathematical and logical algorithms. Modified versions of Max-algebra approach are integrated into this new algorithm to simulate traffic operation at toll plazas. Computational results show that the benefit of tandem tollbooth depends on the number of serial tollbooth, service time and reaction time of drivers. The capacity of tandem tollbooth increases when service time follows a normal distribution rather than negative exponential distribution. Specifically, the lower variance of service time is, the better capacity tollbooth has. In addition, the ratio of drivers reaction time to service time affects the increasing ratio of the capacity extended by tollbooth.
Management Science and Financial Engineering | 2013
Sungwook Kang; Hongsuk Yang
An interesting puzzle in business practices is that although many researchers emphasize the benefits of a revenue-sharing contract, a wholesale contract has remained to be the most common contractual form. By introducing the concept of unobservable efforts, we examine the contractual efficiency of a wholesale contract and a revenue-sharing contract. The multi-task agency model and experimental design approach are used to analyze the relationship between the contractual efficiency and parameters. A major finding of our study is that a wholesale contract coordinates unobservable efforts, while it fails to coordinate the order quantity decision. Because unobservable efforts have mixed effects on the contractual efficiency, the superiority of contract type depends on parameters. This finding implies that a wholesale contract can be a competitive contract, especially when unobservable efforts are heavily involved. Our conclusion is that the current popularity of a wholesale contract is manager’s rational response to complex supply chain environments rather than irrational behaviors.
Journal of the Korean operations research and management science society | 2012
Sung Wook Jung; Hongsuk Yang; Soo Wook Kim
In recent years, service delivery systems employing a self-service approach have been rapidly spreading. Since a self-service system provides a lower product price, it attracts more customers. However, some system managers are still hesitant to accept a self-service system, because there is no systematic model to predict its performance. Therefore, this research attempts to provide a systematic and quantitative model to predict the performance of a self-service system, focused specifically on a self-service gas station. Under this model, the traditional queuing theory was adopted to describe the general self-service process, but it is also assumed that some changes occur in both the customer arrival rate and the service performance rate. In particular, the price elasticity was introduced to capture the change in the customer arrival rate, and the existence of learning effect and helpers were assumed to design the changed service performance rate. Under these assumptions, a simulation model for a self-service gas station is established, and three performance measurements, such as average number of customers, average waiting time, and Utilization are observed, depending on the changes in price difference and helper-operating time. In this research, the optimal operation strategy for price differentiation and helper-operating time is proposed in accordance with the level of the customer learning rate. Although this research confines the scope of the study to the self-service gas station model, the results of this research can be applied to any type of self-service system.
Asian Journal on Quality | 2009
Hongsuk Yang
This paper considers the short term fleet scheduling problem as described by Keskinocak and Tayur (1998). Fleet scheduling may directly affect the service quality of fractional jet aircraft business. The contributions of this paper are two: (i) we show how their model is easily implemented in a standard modeling language, LINGO, and (ii) an alternate formulation is given which is expected to perform better on large, difficult problems.
European Journal of Operational Research | 2009
Hongsuk Yang; Linus Schrage
International Journal of Hospitality Management | 2011
Kyung Ho Kang; Seoki Lee; Hongsuk Yang
Corporate Governance: An International Review | 2018
Jae Yong Shin; Jeong-Hoon Hyun; Seungbin Oh; Hongsuk Yang
Archive | 2006
Hongsuk Yang
The Korean Journal of Nutrition | 2018
Kana Asano; Hongsuk Yang; Youngmi Lee; Jihyun Yoon