• Proceedings of the Military Operations Research Society of Korea Conference
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• 2007.03a
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• pp.118-140
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• 2007

• Journal of the Korea Institute of Information Security & Cryptology
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• v.20 no.6
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• pp.271-288
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• 2010

In this paper, we study the dysfunctions of cryptography as dual-use goods and national domestic encryption control policies like key recovery system and decryption order. And we examine risks of the breach of the peoples' constitutional rights like the right to privacy in these policies and analyze these policies by applying the principle of the ban on the over-restriction. Finally, we propose the direction and requirements of our national domestic encryption control policy that maintains the balance of peoples' constitutional rights and investigatory powers.

• Journal of the Korea Convergence Society
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• v.11 no.12
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• pp.233-242
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• 2020

We posit that employee ownership through defined contribution (DC) plans results in managerial entrenchment, and then examine the effect of the enactment of the Pension Protection Act of 2006 on the relation between the employee ownership and firm performance. By conducting Ordinary Least Square regression with the data from Form 5500 over the period of 1999-2014, we find that firms with large employee ownership increase their firm value measured by Tobin's Q after the adoption of the Act. These findings suggest that the adoption of the Act has been effective to mitigate the negative effect of managerial entrenchment by decreasing the employee ownership and reinforcing the fiduciary duty of plan trustees. Given the fact that we test the effects of the diversification rule on employee ownership using firm performance, further research could aim to examine the effects of the rule on employee ownership using stock return or market reaction.

• Journal of the Korea Society for Simulation
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• v.19 no.1
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• pp.133-141
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• 2010

This research suggests a unified scheme for using stratified sampling and control variates method to improve the efficiency of estimation for parameters in simulation experiments. We utilize standardized concomitant variables defined during the course of simulation runs. We first use these concomitant variables to counteract the unknown error of response by the method of control variates, then use a concomitant variable not used in the controlled response and stratify the response into appropriate strata to reduce the variation of controlled response additionally. In case that the covariance between the response and a set of control variates is known, we identify the simulation efficiency of suggested method using control variates and stratified sampling. We conjecture the simulation efficiency of this method is better than that achieved by separated application of either control variates or stratified sampling in a simulation experiments. We investigate such an efficiency gain through simulation on a selected model.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1995.04a
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• pp.749-749
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• 1995

• Journal of the Korea Society for Simulation
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• v.18 no.2
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• pp.49-55
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• 2009

In this paper, we investigate an optimal allocation of constant service resources in stochastic system to optimize the expected performance of interest. For this purpose, we use the control variates to estimate the gradients of expected performance with respect to given resource parameters, and apply these estimated gradients in stochastic optimization algorithm to find the optimal allocation of resources. The proposed gradient estimation method is advantageous in that it uses simulation results of a single design point without increasing the number of design points in simulation experiments and does not need to describe the logical relationship among realized performance of interest and perturbations in input parameters. We consider the applications of this research to various models and extension of input parameter space as the future research.

• Korean Business Review
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• v.22 no.1
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• pp.1-25
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• 2009

Typically, economic rationality is too apart from in a public enterprises system is started many cause troubles. The government in that upper management personnel of agencies and politicians who exploit the parachute and coalesce with the labor union as a hotbed of corruption due to inefficiency have bands. Most of peoples need to reform public enterprises and the idea became. The future direction of public enterprise reform is clear. As like Infrastructure industrial sector which is difficult to privatization of government owned and controlled public enterprises to improve efficiency and management systems to build. On the other hand, it is difficult to upset non-public enterprises, private sector efficiency in the transfer of management control to consider the idea of an active policy of privatization conversion is required.

• Journal of the Korean Operations Research and Management Science Society
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• v.29 no.3
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• pp.63-78
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• 2004

This paper deals with a supplier-managed inventory(SMI) control for a two-echelon supply chain model with a service facility and a single supplier. The service facility is allocated to customers and provides a service using items of inventory that are purchased from the supplier, Assuming that the supplier knows the information of customer queue length as well as inventory position in the service facility at the time when it makes a replenishment decision, we identify an optimal replenishment policy which minimizes the total supply chain costs by reflecting these information into the replenishment decision. Numerical analysis demonstrates that the SMI strategy can be more cost-effective when the information of both customer queue length and inventory position is shared than when the information of inventory position only is shared.

• Review of KIISC
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• v.22 no.6
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• pp.9-14
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• 2012

정보보호 활동에 대한 이사회 및 최고경영층의 역할과 책임을 강조하는 거버넌스에 대한 이슈가 최근 공공기관 및 민간기업 공히 화두로 등장하고 있다. 조직 내 정보보호가 효과적으로 수행되기 위해서는 무엇보다도 정보보호에 대한 주요 방향 제시와 통제 기능을 수행하는 최고경영층의 리더십과 지원체계가 핵심성공요인이라는 것을 인식하기 시작한 것이다. 이러한 정보보호의 새로운 패러다임을 반영하여 현재 정보보호 거버넌스에 관한 국제표준화 작업이 완성단계에 있어 2013년에는 국제표준으로 발표될 예정이고, 국내 KS 표준으로도 상정될 예정이다. 또한 최근 금융권을 비롯하여 정보보호 거버넌스 도입을 위한 프로젝트가 수행되었다. 본 연구에서 국제표준의 내용을 중심으로 거버넌스를 위한 원칙과 프로세스를 소개하고, 국내 정보보호 거버넌스 도입 사례 연구를 통해 거버넌스의 현 수준을 살펴보고 향후 추진되어야 할 과제를 제시하고자 한다.

• Journal of Internet Computing and Services
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• v.19 no.6
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• pp.9-20
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• 2018

Financial service industry has introduced and operated management systems such as information security management system (ISMS), personal information security management system, business continuity management system to protect and maintain suitably customer's financial information and financial service. This study started that it's desirable financial industry takes consideration of ISMS and it can be different types among various organizations taking consideration of culture, practical work, and guideline of information security. The study derives primary control areas of ISMS through analyzing non-conformity trends and control factors according to certification audit for finance-related organizations introduced international ISMS of ISO27001 which is well known and commonly applicable irrespective of areas in financial service industry. Through case analyses for five finance-related organizations operating ISMS, this study analyzed improvement effects of ISMS. It has a meaning as an initial research though it was difficulty in acquiring data for empirical study because of rare organizations maintaining certification in financial sector. As a result, number of non-confirmity from the first audit to three years' elapse was decreased every year. Physical and environmental security, communication and operations management, and access control having the highest frequency of non-conformity each presented 23%, 19%, and 17%, which reached 59% in total and they are derived into primary control areas. ISMS can fulfill technical, managerial, physical security issues, which have not been treated importantly in financial industry. In addition, this study presented that ISMS can be an effective management system applicable for financial service industry.