• Korean Journal of Construction Engineering and Management
• /
• v.12 no.6
• /
• pp.160-167
• /
• 2011

An Analysis on the Pre-Feasibility Evaluation Factors of Activation for Welfare Facilities for the Residents in Apartment Building. The adapted research method of selected case five apartment building in D new town and carried out questionnaire survey to residents and user for draw items of feasibility evaluation. Drew items of feasibility evaluation classify as Plan section, Design section, and Operation section and evaluate the weight of each section utilizing analytical hierarchy process (AHP). Depending on the purpose and methods. The results of this study are as follows: Such as Plan section, Composition of Program Facility, User Charge Survey, Arrangement of Program Room were analyzed highest. Such as Design section, Arrangement of Program Room, Circulation planning, Educational Equipment were analyzed highest. And such as Operation section, Operation costs, Operation Plan, Review of Program Facility were analyzed highest.

• Proceedings of the Korea Society for Simulation Conference
• /
• 1992.10a
• /
• pp.9-9
• /
• 1992

시뮬레이션(simulation)은 실 시스템(real system)의 효과적이고 효율적인 운영을 도모하기 위하여 실 시스템의 동작을 이해하고 분석, 예측, 평가하는 과학적인 문제해결 접근방법이다. 시뮬레이션 수행단계는 실 시스템의 행위를 정확히 반영하도록 타당한 모델을 구축하는 모델링 단계와 모델에 의도하는 명령어들을 컴퓨터 프로그램으로 작성하는 구현단계로 나누어진다. 시뮬레이션 모델은 시간, 상태, 확률변수, 상호규칙 등의 여러 관점에 따라 다양하게 존재하는데, DEVS(Descrete EVent system Specification) 모델은 연속적인 시간상에서 이산적으로 발생하는 사건에 따라 시스템의 상태를 분석할 수 있고 모델링 및 시뮬레이션 방법론의 형식화를 위한 견고한 이론적 기반을 제공하고 있다. 또한, DEVS 모델은 모듈적, 계층적 특성을 제공하고 집합론에 근거한 수학적 형식구조를 제공하여 실 시스템에 대한 체계적인 분석과정을 수행하게 되어 보다 현실적인 모델링을 가능하게 한다. 그러나 타당하지 못한 DEVS 모델이 구축되면 시뮬레이션을 통한 분석결과의 신뢰성이 떨어져 아무런 효과가 없고 경제적인 손실만이 따른다. DEVS 모델에 대한 기존의 타당성 검사가 많은 시간과 노력이 요구되고, 반복적인 DEVS 모델링 과정으로 인한 전문적이고 경험적인 지식을 요구한다. 또한, 모델설계자에 의해 설정된 실험 프레임하에서 DEVS 모델의 구성요소에 속하는 상태전이함수, 시간진행함수 및 출력함수에 대하여 commutative 성질의 보전성 검사가 어렵다는 문제점을 가지고 있다. 본 연구에서는 이와 같은 문제점을 해결하기 위하여, DEVS 모델에 대한 타당성 검사를 SPN(Stochastic Petri Net) 모델로 변환하여 SPN 모델을 이용하는 간단하고 효과적인 타당성 검사 방법을 제안한다. 먼저, DEVs 모델에 대한 개념과 기존의 DEVS 모델에 대한 타당성 검사 방법을 고찰하고 그 문제점에 대하여 자세히 설명한다. DEVS 모델의 타당성 검사에 이용하는 SPN 모델에 대한 개념과 DEVS 모델과 행위적으로 동등한 SNP 모델로 변환을 위한 관점을 제조명하다. 동일한 관점에서 두 모델의 상태표현이 같도록 DEVS 모델이 SPN 모델로 표현됨을 보이는 변환이론을 제시하고 변환이론을 바탕으로 모델 변환과정을 제시한다. 모델 변환이론과 변환고정을 기본으로 타당성 검사를 위한 새로운 동질함수(homogeneous function)를 정의하고 이와 함께 SPN 모델의 특성을 이용하여 DEVS 모델에 대한 타당성 검사 방법을 새롭게 제안한다.

• Korean Journal of Construction Engineering and Management
• /
• v.5 no.3 s.19
• /
• pp.97-105
• /
• 2004

Planning phase became very important because the construction market in Korea is often unpredictable. The existing feasibility analysis cannot fulfill its purpose in development projects because they are based on intuitive approach rather than systematic approach. The purpose of this study is to make a prototype of feasibility model to be a good investment. To build the model, first, risk factors which can be occurred in project had to be selected. Risk factors were divided into several groups in basis of characteristical risk. Economical risk factors were input on financial analysis. Then, to catch the relevance and influence of all risk factors, influence diagram and decision tree were made. Finally, sensitivity analysis was activated, then what the critical factors were, and how those factors could be solved. Through these procedures, the feasibility model that was made in this study could include both quantitative and qualitative factors. This model is expected to be used as a guide of feasibility analysis including all risk factors and is to serve systematic frame in planning and feasibility stage.

• Korean Journal of Construction Engineering and Management
• /
• v.6 no.5 s.27
• /
• pp.110-118
• /
• 2005

This paper examines the method of evaluation for feasibility study factors on housing development projects which can assist project managers to asses potential sources of risk. The aim is to reduce uncertainty on the project objectives. The major initial goals for a feasibility analysis are to define a limited set of key related factors which apply to housing development project according to development and market environment, condition of project planning and economics. Thus, in order to construct types of factors related with the feasibility, the research executes Delphi Method subjected personnel in the task to explore housing development projects. Such exploration provide the information for Importance Index, Extra Weight and the Mean of Extra Weight that is used for constituting confines of factors related with a feasibility analysis.

• Korean Journal of Construction Engineering and Management
• /
• v.5 no.1 s.17
• /
• pp.71-79
• /
• 2004

In the stage of feasibility study of urban rehabilitation projects, the precise forecast of physical and environmental changes has great influence on the further transaction of the projects. However, various important decision makings are made by the experience and intuition of the person-in-charge in practice without the process and method for systematic and quantitative analysis. In spite of various qualitative influent factors on the projects, the feasibility studies are made by the result of economic analysis only, which often lead the projects to the crucial deficit. The main reasons of such a mal-functional transaction are due to the absence of the reasonal procedure of feasibility study and decision making reflecting the characteristics of urban rehabilitation projects. The objective of this paper is to propose feasibility study processes and decision making methods in relation to various influent factors on urban rehabilitation projects in the initial stage. The goal and process of every analysis stage and the pertinent factors and decision makings are analyzed and proposed through the survey of current research, a case study, interview with the professionals. The processes and methods are well applied to improve current problems of feasibility study of urban rehabilitation projects. In addition, the establishment of the analysis goal at three principal stage and a series of reasonable decision makings with pertinent factors to each stage will lead the project to more successful result than ever.

• Korean Journal of Construction Engineering and Management
• /
• v.11 no.5
• /
• pp.3-14
• /
• 2010

This study investigated and analyzed feasibility analysis case studies, carried out by contractor of EPC LSTK projects in the planning stage to suggest the strategies to solve problems for project improvement. For this, five feasibility analysis case studies of gulf cooperation council (GCC) countries were reviewed and investigated. The results can be summarized as follows: 1) Those factors needed to be analyzed, including cost increase, project delay, quality decrease were insufficiently considered when assessing feasibility. 2) And improvement strategies for three problems mentioned above were suggested based on findings in feasibility analysis. 3) Lastly the process of the project feasibility analysis that can be applied to overseas plant construction project was suggested step by step.

• Proceedings of the Korean Institute Of Construction Engineering and Management
• /
• 2008.11a
• /
• pp.905-908
• /
• 2008

The BTL project, 4 years since its operation, has benchmarked the PFI Project in Japan and has been introduced. Given the evaluation step to select a preferred bidder, in a technological factor, the basic plans are corrected and complemented, whereas in a price factor, the low price bidding system is being enforced. There is concern that how to select preferred bidders and how to operate project costs during operation and management period may be problematic. Thus, in this study, using the Analytic Hierarchy Process, the method of deciding the pribrity to select preferred bidders in an early stage of the project and the evaluation model to evaluate the validity of BTL project expenses in process of project enforcement are established. Targeting the group. composed of experts who have experiences in the BTL project. Then, the levelling of evaluation factors and grouping have been carried out as following: LCC analysis and disbursement for government including two more detailed factors.

• Proceedings of the Korea Society for Simulation Conference
• /
• 1998.03a
• /
• pp.61-64
• /
• 1998

도로의 건설을 위해서는 통상 타당성조사, 기본계획, 기본설계 및 시공의 여러 가지 단계를 밟는다. 이들 각 단계를 거치면서 일반적으로 투자비 추정액은 실제 공사비와 더욱 근접하게 되게 되나, 타당성조사 등 계획단계에서의 추정액은 실제 공사비와 상당한 차이를 보이는 것이 일반적이다. 이러한 차이는 계획물량의 추정이나, 단가의 추정 등에서도 발생할 수도 있고, 구체적인 지질조사 등이 없는 상태에서 가정한 지질조건이나 공사조건 등에 대한 불확실성으로 인해 발생한다. 현재의 일반적인 관행은 이러한 투자비 추정단계에 작용하는 불확실성을 명시적으로 고려하여 투자비 추정치의 확률적인 분포를 산정하지 않고, 하나의 확정적인 추정치만 제시하고 있어 제시된 추정치의 신뢰도를 확인하기가 곤란하다. 본 연구에서는 현재의 관행과는 달리 투자비추정에서 관여하는 불확실성을 확률분포를 사용하여 명시적으로 고려하여 추정된 투자비에 대한 확률분포를 명시적으로 파악하려는 노력을 하였다. 추정된 투자비에 대한 확률분포는 Mont Carlo 시뮬레이션 방법을 이용하여 분석하였으며, 연구의 결과와 현재 각 계획단계에서 일반적으로 용인되는 추정오차와의 관계도 분석하였다. 결과에 근거하여 도로사업에 대한 투자비 추정을 효율적으로 할 수 있는 방법을 제시하였으며, 추가적인 연구방향도 제시하였다.

• Proceedings of the Korean Institute Of Construction Engineering and Management
• /
• autumn
• /
• pp.454-459
• /
• 2003

Feasibility study on large scale projects like an investment on infrastructure development is very important because it provides fundamental data which determine the total investment size and duration. However, previous feasibility studies have a few problems of ambiguous estimation standards, unsystematical estimation methods, and so on. Accordingly, this study intends to regulate tile problems on economic feasibility as well as financial feasibility study which have been considered more critical in recent time, subsequently presents a reform measure. Also, this study identifies predictable risks during the feasibility study, presents a scheme which lets investor and owner control the risk themselves through a process which uses theoretical and political management plans.

• Journal of Korea Technology Innovation Society
• /
• v.3 no.1
• /
• pp.22-36
• /
• 2000

본 연구에서는 신제품의 경제성 분석에 있어 기존연구의 분리된 방법론을 통합한 새로운 모델의 수립에 의의가 있다. 필자가 제시하고 있는 신제품의 전주기 경제성 분석모델은 신제품의 연구시작 단계에서부터 시제품 생산, 공장가동 생산판매 공익적 가치분석, 소비자 행태분석 단계까지를 통합하고 있다 본 모델에서는 기존의 경제학, 경여학, 산업공학에서 개별적으로 분리되어 사용되어 온 경제성 분석의 방법론을 수요자 중심으로 통합함으로써 분석의 객관성과 구체적 적용성을 높였으며 또한 각 분석단계마다 연구사례를 제시하여 독자의 이해와 활용성을 제고시켰다.