• Management & Information Systems Review
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• v.38 no.4
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• pp.159-182
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• 2019

The purpose of this study is to investigate the impact of members' perception of unit change management efforts on their emotional-organizational commitment during the military restructuring. The mediating effect of change acceptance of the members in this relationship is also studied. Currently, the military is seeking to restructure its military construct in order to actively cope with the rapidly changing security situation and the decrease in military service resources. If an organization fails to effectively manage its changes when undergoing restructuring, it is difficult to expect the success of organizational change due to its members' resistance to change. Therefore, this study suggested the effect of members' perception of personnel fairness and transformational leadership on their emotional-organizational commitment and the mediating role of the members' change acceptance in the relationship between them as the hypotheses. Survey results show that personnel justice and transformational leadership has a positive impact on the emotional-organizational commitment of the members, and that the change acceptance of the members partially mediates the relationship between them. By presenting the mediating effect of change acceptance with theoretical implications, the theory has been expanded. In practice, the change management activities for the restructuring of the military structure have been identified, and the effort for enhancing the change acceptance of the members is required to success on the organizational restructuring.

• Journal of Navigation and Port Research
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• v.37 no.4
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• pp.429-438
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• 2013

This study set up research models and hypothesis in order to analyze those factors assuming that swift trust affects group cohesiveness, group cohesiveness affects organizational civil activities and organizational effectiveness (job satisfaction and organizational commitment) and at the same time plays as a medium for the swift trust, organizational civil activities and organizational effectiveness. Based upon these finding, variables in the ship unit are analyzed through surveys. This shows that the swift trust has statistically a meaningful and beneficial impact on group cohesiveness which has statistically a meaningful and beneficial impact on organizational civil activities and organization effectiveness. In terms of effects of crew members' the swift trust on organizational civil activities, organizational commitment, and job satisfaction, group cohesiveness has a partial medicated effect.. This paper has its significance in practically proving that the established swift trust of crew members increase group cohesiveness, the heightened group cohesiveness results in the changes of behaviors and attitudes of crew members in the seagoing vessel.

• Health Policy and Management
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• v.15 no.4
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• pp.110-135
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• 2005

The objectives of this study were (1) to describe doctors' perception and attitudes toward patient safety culture and medical error reporting in their working unit and hospitals, (2) to examine whether these perception and attitudes differ by doctors' characteristics, such as sex, position, and specialties, and (3) to understand the relationship between overall perception of patient safety in their working unit and each sub domain of patient safety culture. A survey was conducted with 135 doctors working in a university hospital in Korea. After descriptive analyses and chi-square tests of subgroup differences, a multivariate-regression of overall perception of patient safety in their unit with sub-domains of patient safety culture was conducted. Overall, a significant proportion of doctors expressed negative perception of their working units' patient safety culture, many reporting potentials for patient safety problems to occur in their unit. They also negatively viewed their hospital leadership's commitment on patient safety. Regarding the patient safety in their working unit, doctors were most worried about staffing level and observance of safety procedures. Most doctors did not know how and which medical error to report. They also perceived that medical errors would work against them personally and penalize them. About 22 percent of respondents believed that even seriously harmful medical errors were not reported.

• Journal of the Korea Institute of Military Science and Technology
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• v.20 no.2
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• pp.279-288
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• 2017

The Material Transportation Capability Analysis Method in North Korea includes adversary's activities such as destruction of bridge which is one kind of choke points in the road network and surprise attack against resupply march unit. Also, the amount of damage on choke points in the road network and repair time depending on repair unit commitment must be reflected. In this study, a scenario encompassing plausible resupply transportation circumstances while counterattacking into NK will be established. Then, based on such scenario, a simulation model will be established and the result of simulation will be compared to the results of numeric example which has been used in the ROK Army. We demonstrate, through a certain Corps operation area, that the Scenario-based Simulation Model results predict the performance of resupply operation very well. Therefore, it makes sustainment planners and commanders do activities which is suitable for battlefield and should be used in the real situation. It is also a stochastic model.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.938-946
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• 2005

We study the firm's strategy to price its products and plan the spare parts manufacturing so as to maximize its profit and at the same time to fulfill its commitment to providing the customers with the key parts continuously over the relevant decision time horizon, i.e., the production plus warrantee period. To examine the research question, we developed and solved a two-stage optimal control theory model. Our analysis suggests that if the cost to produce the spare part during the warrantee period is more expensive than that during the production period, the firm should increase its sales price gradually throughout the production period to control its sales. In addition, during the production period it is optimal for the firm to produce the spare parts more than needed so that the overproduced spare parts can be used to partially meet the demand during the warrantee period. We conducted numerical analysis to investigate the sensitivity dynamics among key variables and parameters such as inventory holding cost, unit spare part production costs, part failure rate, and parameters in the demand function.

• Proceedings of the KIEE Conference
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• 2008.11a
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• pp.457-459
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• 2008

This paper presents the optimization of CHP (Combined heat and power) plant under deregulated market. In this case, a boiler is added as different source for heat providing, that gives flexible and efficient operation for the plant. The purpose of optimization is to maximize the profit in period of 24 hours by making unit commitment decision, called "optimal policy". In this paper, Dynamic Programming method is introduced as the effective and efficient method. Finally, an example is solved to illustrate the optimal Policy of such a CHP and boiler.

• Journal of Power Electronics
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• v.9 no.6
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• pp.919-928
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• 2009

Microgrids (MGs) are typically comprised of distributed generators (DGs) including renewable energy sources (RESs), storage devices and controllable loads, which can operate in either interconnected or isolated mode from the main distribution grid. This paper introduces a novel dynamic programming (DP) approach to MG optimization which takes into consideration the coordination of energy supply in terms of heat and electricity. The DP method has been applied successfully to several cases in power system operations. In this paper, a special emphasis is placed on the uncontrollability of RESs, the constraints of DGs, and the application of demand response (DR) programs such as directed load control (DLC), interruptible/curtaillable (I/C) service, and/or demand-side bidding (DSB) in the deregulated market. Finally, in order to illustrate the optimization results, this approach is applied to a couple of examples of MGs in a certain configuration. The results also show the maximum profit that can be achieved.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.10
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• pp.1721-1730
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• 2007

SThis paper proposes a new dispatch scheduling algorithm in interconnected regional system operations. The dispatch scheduling formulated as mixed integer non-linear programming (MINLP) problem can efficiently be computed by generalized Benders decomposition (GBD) algorithm. GBD guarantees adequate computation speed and solution convergency since it decomposes a primal problem into a master problem and subproblems for simplicity. In addition, the inter-temporal optimal power flow (OPF) subproblem of the dispatch scheduling problem is comprised of various variables and constraints considering time-continuity and it makes the inter-temporal OPF complex due to increased dimensions of the optimization problem. In this paper, regional decomposition technique based on auxiliary problem principle (APP) algorithm is introduced to obtain efficient inter-temporal OPF solution through the parallel implementation. In addition, it can find the most economic dispatch schedule incorporating power transaction without private information open. Therefore, it can be expanded as an efficient dispatch scheduling model for interconnected system operation.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.26 no.12
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• pp.93-98
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• 2012

Economics of available alternatives in the transmission planning are evaluated by the investment cost, loss cost and congestion cost. Congestion/loss cost is calculated in many years and many load levels by unit commitment of generators, optimal dispatch, load flow, judgement about transmission congestion and re-dispatch to reduce the congestion. The greatest difficulties to introduce variable optimization techniques on the transmission planning is the convergence of load flow. In this paper, economics in the transmission planning are evaluated using DC load flow, and case study is conducted on the Korea power system by proposed congestion/loss calculation methods.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.831-833
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• 2005

과거 전력산업의 독점체제에서 발전기 기동 정지계획은 1-7일 정도의 예측된 부하를 최소비용으로 공급하기 위해서 발전기의 정보만을 고려하여 수요에 부합되도록 결정되었다. 향후 전개될 전력시장의 형태인 완전경쟁시장에서는 각 발전사업자가 자신의 발전기들을 대상으로 이익을 최대화하기 위한 입찰전략으로서의 기동정지계획을 수립하게 된다. 본 논문에서는 이익극대화로서의 발전사업자 기동정지계획을 수립함에 있어 유전알고리즘을 적용하였다. 또한 발전사업자의 입찰전략에 주요한 요소로 작용하는 입찰량 결정에 있어서 발전기 증감발율을 고려하여 최적의 발전량을 결정하도록 하였다.