• 대한전기학회논문지:전력기술부문A
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• 제55권5호
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• pp.214-219
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• 2006

Oligopoly differs from perfect competition and monopoly in that a firm must consider rival firms' behavior to determine its own best policy. This interrelationship among firms is the issue examined in this paper. In the oligopoly market, the complete information market means that each producer has full information about itself, the market, and its rivals. That is, each producer knows the market demand function, its own cost function and the cost functions of rivals. On the other hand, the incomplete information market means that in general each producer lacks full information about the market or its rivals. Here, we assume that each firm doesn't know the cost functions and the strategic biddings of its rivals. The main purpose of this paper is to analyze firm' strategic behaviors and equilibrium in an electricity market with incomplete information. In the case study, the complete information market and the incomplete market are compared at the Nash Equilibrium from the viewpoints of market price, transaction quantities, consumer benefits, and Social Welfare.

• 대한토목학회논문집
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• 제29권3D호
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• pp.373-379
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• 2009

건설 프로젝트에 있어 공사비 산정은 예산편성, 대안검토, 입찰, 공사수행 등의 각 단계에 따른 의사결정 과정의 주요한 근거가 된다. 이에 따라 사업 초기 단계에서 보다 정확한 사업비를 산정하기 위하여 다양한 방법들이 적용되어 왔으며, 여러 연구를 통해 각 단계의 특성에 적합한 예측 방법론이 필요하다는 문제인식이 이루어져 왔다. 도로공사의 경우, 특히 타당성 조사 및 설계 초기단계에서 기준의 부재 등으로 정확한 사업비 산정에 어려움이 있는 것으로 분석되었다. 본 연구는 이러한 노선결정 이전까지의 단계를 대상으로 설계 초기단계에 적합한 대표공종의 물량 예측에 기반한 공사비 산정체계를 제시하였다. 이를 위하여 87건의 실시 설계 데이터를 분석하여 대표공종을 도출하고, 전체를 토공, 배수공, 포장공, 기타공종으로 구분하여 각 공종별 특성에 기반한 예측모델을 제시하였다. 도출된 공사비 산정모델의 검증을 위하여 9건의 추가 데이터의 공사비 예측결과를 실시 설계 공사비와 비교하여 평균 8% 수준의 오차율을 얻었다. 현행 단위길이당 공사비 기준을 적용한 산정결과와 비교할 때, 본 연구모델의 활용을 통해 설계단계 개략공사비 산정업무의 정확성 및 신뢰성을 향상시킬 수 있는 결과를 제시하였다고 할 수 있다.

• 산업경영시스템학회지
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• 제23권55호
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• pp.51-71
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• 2000

A case of company manufacturing industrial valves is studied. To survive the fierce competition in the low-volume, high-complexity production environment, the company needs accurate information on the cost of its products. Current cost accounting system which allocates production costs based on the weights of intermediates and final products cannot provide accurate cost information that managers really need. Data on the company's cost structure and production processes were reviewed and managers were interviewed before problems with the current costing system were identified. Activity-based costing (ABC) system as well as an improved traditional costing system is considered to replace the current system. A prototype of ABC system is developed to better represent the relationships among the cost drivers, activities, and products.

• 산업경영시스템학회지
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• 제27권4호
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• pp.179-186
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• 2004

The purpose of this study is to implement web-based quality cost management system to measure the performance of quality improvement activities in the business firms. Developed WQCMS(Web-based Q-Cost Management System) have ability to collect and analyze quality data generated from various different departments in the inside or outside of the enterprise without any limitations, if end-users are able to access wide area network. It provides the capability to integrate quality information from database and to generate various easy analysis reports to management's needs using built-in analysis tool modules with real-time. The proposed system was developed using Microsoft's .Net technology, ASP.NET and MS-SQL Server 2000. By web-enabling Q-cost management system, the effectiveness of the system management and utilization was realized by easiness of information integration and economical efficiency.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 가을 학술논문 발표대회
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• pp.232-233
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• 2021

As construction projects become larger and more complex in the construction environment, and as the Building Information Model(BIM) is technically introduced, the demand for construction costs in units of space is increasing. Cost estimating of spacial element can reduce the error in cost prediction method based on cost of work type and to utilize the construction cost data for each space in the design phase. The purpose of this study is to extract spatial statements by utilizing spacial information of quantitative statements based on items that are common elements of the Quantity Take-Off and Bill of Quantity.

• 대한산업공학회지
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• 제34권2호
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• pp.223-234
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• 2008

Mobile multi-hop relaying (MMR) technology is being considered as a promising solution capable to enhance coverage, user throughput, and system capacity of the current wired backbone dependent wireless access networks. Since the relaying nodes do not need a wired backbone access, MMR technology offers easy and low-cost deployment, flexible cell planning, and adaptive traffic handling performance. In this paper, we investigate performance and cost effectiveness of the MMR technology deployment in the IEEE802.16j based WiBro/WiMAX systems. We first introduce standardization activities and research issues of MMR WiBro/ WiMAX systems. Since the coverage extension problem may occur in metropolitan areas as well as suburban or rural areas where user density is relatively low or moderate, we introduce several MMR topologies and analyze cost-effectiveness of MMR based coverage extension with respect to the user traffic density. Then, we argue cost effect on MMR technology deployment and throughput performance, Finally, we introduce further study issues including sectorized base station based MMR deployment approaches and the single and multi-frame structure MMR approaches.

• 디지털융복합연구
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• 제8권4호
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• pp.185-204
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• 2010

본 연구는 정부기관의 정보시스템을 통합한 정부통합전산센터의 사례를 중심으로 IT 통합의 경제적 성과를 측정하였다. 성과측정을 위해 측정항목은 TCO 비용항목에 기반하여 사전 2개 기관에 대한 시범분석을 통하여 최종 측정항목을 개발하였다. 측정결과, IT 자산비용이 가장 큰 경제적 성과로 성과의 대부분을 차지하고 있으며, 다음으로 IT 지원비용과 IT 관리비용의 순으로 경제적 성과가 있는 것으로 조사 및 분석되었다. 본 연구의 주요 의의로는 국내외 선행연구 검토를 토대로 TCO 방법론에 따라 2개 기관을 대상으로 시범분석 과정을 통하여 TCO 측정항목을 IT 통합성과 측정에 적합하도록 개발하였으며, 동 측정항목을 기준으로 신뢰성 있는 현황자료를 토대로 객관적으로 경제적 성과를 측정하였다는 점이다.

• 한국산학기술학회논문지
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• 제20권6호
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• pp.483-488
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• 2019

본 연구는 높은 수익비용대응이 자기자본비용을 감소시키는지 먼저 살펴보고 재량적 발생액과 자기자본비용에 미치는 영향을 검증하도록 한다. 선행연구에 의하면, 수익비용대응이 높을수록 이익의 질이 높은 것으로 나타났다. 이익의 질이 높을수록 정보위험이 낮고, 정보위험이 낮으면 기업의 자본비용은 감소할 것이라고 하였다. 재량적 발생액은 서로 상반되는 두 개의 역할을 한다고 하였다. 첫째 경영자는 재량적 발생액을 사용하여 기업의 미래에 대한 정보를 정보이용자에게 제공하므로 이익정보의 유용성을 제고시키는 역할을 한다고 보았다. 둘째 경영자는 재량적 발생액을 의도적으로 사용하여 이익을 왜곡시키고 정보이용자에게 잘못된 정보를 제공하므로 이익정보의 유용성을 감소시킬 수 있다고 보았다. 이러한 선행연구의 결과를 비추어 볼 때, 먼저 수익비용대응이 높을수록 자기자본비용이 감소하는지를 살펴본다. 높은 수익비용대응이 수행된 기업의 경우 재량적 발생액을 이용하여 자기자본비용을 감소시키는지를 살펴본다. 연구결과, 수익비용대응이 높을수록 자기자본비용이 감소하는 것으로 나타났다. 수익비용대응이 높은 기업들은 재량적 발생액을 이용하여 자기자본비용을 감소시키는 것으로 나타났다.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.253-260
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• 2022

Existing web-based cost databases have proved invaluable for construction cost estimating. These databases have been utilized to compute approximate cost estimates using assembly rates, unit rates, and etc. These web-based databases can be used independently with traditional cost estimation methods (manual methods) or used to support BIM-based cost estimating platforms. However, these databases are rigid, costly, and require a lot of manual inputs to reflect recent trends in prices or prices relative to a construction project's location. To address this gap, this study integrated deep learning techniques with web-based price analysis to develop a database that incorporates a project's location cost estimating standards and current cost trends in generating a cost estimate. The proposed method was tested in a case study project in Lagos, Nigeria. A cost estimate was successfully generated. Comparison of the experimental results with results using current industry standards showed that the proposed method achieved a 98.16% accuracy. The results showed that the proposed method was successful in generating approximate cost estimates irrespective of project's location.

• 한국정밀공학회지
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• 제29권8호
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• pp.879-886
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• 2012

The ultrasonic horn used for bonding of flip chip has been designed to vibrate at a natural frequency. The ultrasonic horn must be manufactured accurately in physical terms, because the small change of mechanical properties may result in the significant change of natural frequency. Therefore, tight tolerance is inevitable to keep the natural frequency in acceptable range. However, since tightening of the tolerance increases the manufacturing cost significantly, trade-off between the cost and accuracy is necessary. In this research, an attempt was made to design the ultra sonic horn within acceptable natural frequency while the manufacturing cost was kept as low as possible. For this purpose, among the 18 tolerances of physical terms of the ultrasonic horn, the most important 4 factors were selected using Taguchi method. The equation to relate those main factors and the natural frequency was made using response surface method. Finally, optimal design scheme for minimum manufacturing cost without a loss of performance was determined using SQP method.