• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2005년도 학술대회 논문집
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• pp.345-347
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• 2005

The electric demands increase, financial need for new power plant constructions and environmental problem have led to search for more efficient energy production and load management. To minimize the construction of power plants and reduce total power consumption include installation of demand controller to industrial applications. Accordingly to maximize the load control by the diffusion of demand controller, govermental economic supports as well as the analysis of energy saving effects. This paper presents the cost-effectiveness analysis for DSM program evaluation and case study to analyze demand controller DSM program.

• 한국도로학회논문집
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• 제19권6호
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• pp.75-81
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• 2017

PURPOSES : So far, aged cement concrete pavement on express highways has been rehabilitated mainly with asphalt concrete inlay. However, potholes were the major problem, and they shortened the life of the inlay mainly owing to the poor drainage of water once it infiltrated the interface of the concrete and asphalt. The purpose of this study is to compare the performance and economic efficiency of asphalt overlay and inlay. METHODS : Overlay and inlay were compared through accelerated pavement testing, and a life-cycle cost analysis was conducted in this study using the CA4PRS program. RESULTS and CONCLUSIONS : It was found from accelerated pavement testing that the overlay exhibited reflective crack resistance that was more than twice as effective as that of inlay. The total cost (construction cost + user cost) within the analysis period (20 years) of the overlay was 37% lower than that of the inlay.

• 한국건축시공학회지
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• 제14권5호
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• pp.443-449
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• 2014

최근 건설프로젝트에서 발생하는 리스크는 매년 감소하고 있지만 사망사고 등 중대리스크는 증가하는 실정이다. 이에 본 연구에서는 국내 건설회사의 리스크요소를 분석하기 위해 설문조사를 수행하였다. 그 결과 리스크관리 성공에 미치는 영향 요소인 공정, 공사비, 공사계획, 공사성공률, 발주자 만족도, 타공사 성공률 등을 종속변수로 하고 국내 건설회사의 리스크요소를 독립변수로 하여 다중회귀분석으로 분석하였다. 분석결과 리스크관리 성공에 미치는 리스크요소로는 Prototype선정, Simulation, 안전조직도 등이 중요한 요소로 분석되었다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 추계학술대회 논문집
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• pp.303-310
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• 2000

In this study the basic direction of conceptual design of new HSR(High Speed Railway) slab track was determined in the viewpoint of running safety, economic efficiency and maintenance costs. Based on the research results, a detailed conceptual design of HRS slab track is suggested. For the systematic development of slab track, a comparative study is carried out, comparing merits and demerits of each slab type, and used in the design process of slab track. To compensate the demerits of high cost in slab track construction, a program for determination of efficient slab section is coded and applied.

• 한국실내디자인학회논문집
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• 제29호
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• pp.249-256
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• 2001

The Purpose of this study is to Provide a basic data for Projects of residential bathroom remodeling according to contemporary life style. The subjects of this investigation are collected through questionnaire from adult resident who live in Seoul Korea. Four hundred ten cases are collected, and frequencies, percentile, crosstabs, and factor analysis and varianc analysis using Spss-win program analyze adequate cases in necessary condition. In this study, residents demographic informations, bathroom preferences, types, sizes, cost construction period, instruments needs, behaviors and facilities seperation are included. By statistics treatment, the significance of the data is analyzed.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(1)
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• pp.446-450
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• 2003

This paper makes more stronger than original model about sending station fault and saves total construction cost to replace established six-pulse bridge by each six thyristor for DC-transmission. Also, varying of controller for sending station has a robust characteristics for harmonics and unbalanced faults. This paper is verified by simulation using EMTDC program. Comparing with the results of original model, this paper is proved superiority.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회논문집(I)
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• pp.223-228
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• 2000

The principle objective of this study is to make an integrated development environment with an expert system for designing RC retaining walls. The program has several advantages over conventional design tools and characteristics of functions. It is easy to use and to obtain the technical reports with minor efforts. Various possible design alternatives can be compared, then the most optimal design can be selected in terms of construction cost and structural safety.

• 한국농공학회지
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• 제30권3호
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• pp.82-94
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• 1988

A growing attention has been paid to the optimum design of structures in recent years. Most studies on the optimum design of reinforced concrete structures has been mainly focussed to the design of structural members such as beams, slabs and columns, and there exist few studies that deal with the optimum design of large-scale concrete shell structures. The purpose of the present investigation is, therefore, to set up an efficient optimum design method for the large-scale reinforced concrete cylindrical shell structures like intake tower of reservoir. The major design variables are the dimensions and steel areas of each member of structures. The construction cost which is compo8ed of the concrete, steel, and form work costs, respectively, is taken as the objective function. The constraint equations for the design of intake-tower are derived on the basis of strength design method. The results obtained are summarized as follows 1. The efficient optimlzation algorithrns which can execute the automatic optimum design of reinforced concrete intake tower based on the strength design method were developed. 2. Since the objective function and design variables were converged to their optimum values within the first or second iteration, the optimization algorithms developed in this study seem to be efficient and stable. 3. When using the strength design method, the construction cost could be saved about 9% compared with working stress design method. Therefore, the reliability of algorithm was proved. 4. The difference in construction cost between the optimum designs with substructures and with entire structure was found to be small and thus the optimum design with substructures may conveniently be used in practical design. 5. The major active constraints of each structural member were found to be the 'bending moment constraint for slab, the minimum longitudinal steel ratio constraint for tower body and the shearing force, bending moment and maximum eccentricity constraints for footing, respectively. 6. The computer program developed in the present study can be effectively used even by an uneiperienced designer for the optimum design of reinforced concrete intake-tower on the basis of strength design method.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.625-634
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• 2007

Energy-saving is one of important issues in multi-family housing projects in South Korea. According to the study by Yu et al. (2002), the balcony conversion causes energy loss approximately one and a half times. Therefore, it is important to select the economical glass type in the balcony window. In order to identify the most economical glass type of balcony conversion in multi-family housing projects, the most typical type of the multifamily housing projects in the metropolitan area was selected as a candidate project. The selected candidate project has been simulated using ENERGY-10 program to estimate the heat load by the different five types of glasses as well as their life cycle cost analysis (LCCA) using present worth method. Finally, sensitivity analysis has been conducted to determine the most economical glass types under a different discount rate (interest rate) and service life of building.

• 한국컴퓨터정보학회논문지
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• 제7권4호
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• pp.168-173
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• 2002

인터넷 서비스의 급속한 발전으로 전자 상거래의 이용규모가 해마다 증가하고 있다. 이에 따라 소프트웨어 개발비용을 줄이고 자료구축을 용이하게 함으로서 전자상거래의 활성화를 유도하는 방안이 요구된다. 인터넷 기반의 분산기술을 적용한 웹 서비스는 소프트웨어의 공유를 통해 개발비용을 줄이는 기반을 제공한다. 공유된 소프트웨어는 동일 자료에 접근하게 함으로서 서로 다른 사이트에서 공동의 자료를 참조할 수 있게 한다. 본 고에서는 전자상거래를 위한 데이터베이스 처리 모듈을 웹 서비스로 설계 및 구현함으로서 전자상거래 사이트 개발을 용이하게 하고 데이터베이스를 공유할 수 있도록 하였다. 구현된 웹 서비스는 개발자간에 자료의 선택 수정 추가 삭제 및 검색 기능을 지원하며, 서로 다른 사이트간에 상품정보의 공동 활용이 가능함을 보였다.