• 한국항행학회논문지
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• 제2권1호
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• pp.61-67
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• 1998

이 연구에서는 항공기의 주기 문제를 해결하여 주는 스케줄링 시스템과 그 조정을 위한 전문가 시스템(RACES : Ramp Activity Co-ordination Expert System)을 설계 및 개발한 내용을 기술하고 있다. RACES는 공항에서 매일 발생하는 출발편 및 도착편 항공기를 브릿지(bridge)와 스팟(spot)에 배정하기 위해 인간 전문가(human expert)로부터 습득한 해당 분야의 지식(도메인 지식) 및 휴리스틱(heuristic)을 지식 베이스로 갖고 있다. 이 RACES는 브릿지/스팟과 항공기 간에 내적 관계, 예를 들어 승객 및 공항의 그라운드 핸들링(ground handling) 등과 같은 복잡하며 동적인 제약조건 들로부터 발생하는 복잡한 스케줄링 문제를 수반한다. 매일 발생하는 600편 정도의 항공기에 대한 주기장 관리 스케줄링이 인간 전문가에 의해 수행되어졌을 경우에는 약 4~5시간이 소요되는 반면 RACES에 의해 수행되어졌을 경우에는 약 20초 정도의 시간이 소요되었고 RACES로부터 얻어진 스케줄링 결과는 해당 분야의 전문가들로부터 인정되었다. RACES는 또한 예외적인 상황이 발생했을 경우에 스케줄의 부분적인 조정을 처리하도록 설계되었다. 하루의 스케줄링이 완료된 후 항공기의 변경 및 지연 메시지는 도메인 전문가의 지식을 바탕으로 스케줄링에 반영되어 스케줄이 조정되어야 한다. 동적 재스케줄링(reactive scheduling) 단계는 도메인 전문가의 지식 모델 분석을 통해 사용자 그래픽 인터페이스의 규칙과 시나리오로써 효과적으로 나타내어진다. 항공편의 변경 및 취소로 인해 발생되는 항공기 배치의 조정은 현재 스케줄에 반영되어져야 하기 때문에 이러한 항공기 배치의 조정은 동적 재스케줄링을 위해 메인 프레임으로부터 RACES에게 통보되어져야 하며 부분적인 재스케줄링을 처리하는 것에는 불규칙적인 요소들이 많기 때문에 RACES에 의해 스케줄의 조정이 반 자동적으로 수행된다.

• 한국건설관리학회논문집
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• 제10권2호
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• pp.26-33
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• 2009

건설사업의 단계별 진행에 따라서 공정 스케줄의 정확도에 대한 요구수준이 달라진다. 본 연구의 목적은 건설사업의 초기단계에서 활용할 수 있는 표준공정모델을 제시하여 신속하게 전체 개략공기를 산정하는 체계를 제시하는 것이다. 표준공정모델을 적용하여 작업공정을 모듈화하고, Top-down 식 접근으로 상위레벨에서 공정모듈 간 작업연관관계를 분석함으로써 신속하게 프로젝트의 공사기간을 산정할 수 있다. 표준공정모델의 타당성을 검증하기 위해서 각 공정모듈의 작업기간이 일정하다고 가정하고, 가스 플랜트 공정에 대하여 적용시켰다. 그 결과 표준공정모델을 사용하여 계산한 개략 공사기간과 공정관리 툴을 사용한 상세 공사기간은 -3.1% 부터 +15.0%까지의 범위에서 차이를 가졌다. 이러한 결과는 제시된 표준공정모델이 일정 수준의 신뢰성을 가지는 공정 스케줄 정보를 제공하고, 사업기획과 타당성 분석 등 건설사업의 초기단계에서 신속하게 의사결정을 도울 수 있다는 것을 보여준다.

• 토지주택연구
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• 제2권4호
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• pp.355-365
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• 2011

Construction duration is very important as a factor which comprises three axises of construction management with quality and cost in construction project. In general project condition, construction duration is optimized while minimizing construction cost and securing required quality. However, in case of insufficient project time duration or delayed projects, project progress management is different from those of normal projects. These project areas need solutions to complete work within a given completion day. To time shortening the current duration of each typical floor of structural framework in apartment construction is investigated, and a basic time schedule planning for typical floor of structural framework in normal projects is planned. This study proposed 3 ways for time shortening of urgent project or insufficient construction duration project. Also, This study proposed detailed time shortening method and technical solution conditions while time is shortened.

• Asia pacific journal of information systems
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• 제10권4호
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• pp.37-56
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• 2000

This study proposes the concept and measurement of object-oriented systems modelling activity based on the previous research in the area of systems engineering, object-oriented modelling, and information systems. The modelling activity is related to information systems development success for exploring the correlation of each other. The object-oriented modeling activity is found to be related to user satisfaction with developed information systems, But the modeling activity does not have relation to the other successes, such as cost, development schedule, and maintenance. This study contributes to systems development modeling research, systems success, and object-oriented systems modelling research. Practically, the results support the usefulness of object-oriented modelling effort in the field in terms of user satisfaction.

• 핵의학기술
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• 제13권3호
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• pp.193-195
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• 2009

Purpose: The work flow of international hospital's laboratory consists of rapid test and result report at the present day. However, the frequent inquiry of sample, which cause affairs to delay and efficiency to Lower, affects medical examination. In order to promote work's efficiency, we should improve the problem and make work smooth between a laboratory, outs and ward. Materials and Methods: This study runs as follows. First, Investigating test result, test schedule, test receipt, quick result, etc through the activity required from September to November 2007 about the inquiry of sample. After analysis of the problem in December, remaking the test schedule for improvement solution and reporting it to outs and ward. When the result is retest and dilution, we directly fill in a result space with the result situation of the patient to let them know beforehand. We also, prevent the omission of the result through checking the sample list and discriminate in vivo from in vitro by changing the laboratory's telephone number. We have improved the problem about the inquiry of sample through valuation and analysis since the improvement activity from January to March 2008. Result: The case about the frequent inquiry of sample has reduced by 57.8%. this improvement activity indicated that p-value<0.05 was statistically significant through paired t-test. This activity make study smooth and we rapidly report the result. Conclusion: By reducing the case regarding the inquiry of sample, work discontinuation, and concentration reduction, the work efficiency was increased.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1993년도 춘계공동학술대회 발표논문 및 초록집; 계명대학교, 대구; 30 Apr.-1 May 1993
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• pp.343-352
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• 1993

In this study, a modified algorithm for the exchange heuristic is developed and applied to a resource-constrained scheduling problem. The problem involves multiple projects and multiple resource categories and allows flexible resource allocation to each activity. The objective is to minimize the maximum completion time. The exchange heuristkc is a multiple pass algorithm which makes improvements upon a given initial feasible schedule. Four different modified algorithms are proposed. The original algorithm and the new algorithms were compared through an experimental investigation. All the proposed algorithms reduce the maximum completion time much more effectively than the original algorithm. Especially, one of four proposed algorithms obviously outperforms the other three algorithms. The algorithm of the best performance produces significantly shorter schedules than the original algorithm, though it requires up to three times more computation time. However, in most situations, a reduction in schedule length means a significant reduction in the total cost.

• 한국경영과학회지
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• 제20권1호
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• pp.85-99
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• 1995

Increasingly, risk analysis is becoming important ingredients in achieving the successful implementation and application in the area of the project management. The project management system is designed to manage or control the project resources on a given activity within time, cost and performance so called TPPM (Total Productive Project Management). In this research, a risk analysis model misproposed to identify potential problem areas, quantify the risks, and generated the chice of the action that can be taken to reduce the risk. In addition two analysis models are proposed : 1) risk factor model and 2) network simulation model using VERT (Venture Evaluation and Review Technique ). The objective of the remodels is to estimate the schedule, cost performance risks. These proposed quantitative models for project risk analysis are proving its value for the project managers who need to assess the risk of changes in cost, schedule, or performance. The proposed models will be used in the area of project selection, evaluation and the allocation of project resources.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전력기술부문
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• pp.351-353
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• 2006

Preventive maintenance can avail the generating unit to reduce cost and gain more profit in a competitive supply-side power market. so, it is necessary to perform reliability analysis on the systems in which reliability is essential. In this paper, FMECA assessment adopted using real historical failure data in Korean power plants for apply RCM analytical method. The stochastic FMECA is an engineering analysis and a core activity performed by reliability engineers to review the effects of probable failure modes of generating unit and assemblies of the power system on system performance. Optimal RCM schedule which is considered the severity level of each generating unit and failure probability from failure prediction of generating unit can be planned using proposed FMECA with IOE index.

• Advances in Traditional Medicine
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• 제8권4호
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• pp.354-364
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• 2008

The present study was carried out to investigate the antihypertensive effect of a folklore herbal formulation (HF) (300mg/kg/day; p.o.) in deoxycorticosterone acetate (DOCA)-salt induced and fructose induced hypertensive rats. In DOCA model, DOCA (15 mg/kg, s.c., twice a week) was administered to unilateral nephrectomized rats for 4 weeks. In fructose model, drinking water was replaced with 10% fructose solution for 6 weeks to induce hypertension. Systolic blood pressure (BP) was measured once every week during the treatment schedule. After completion of treatment schedule, BP and vascular reactivity to various agonists like Noradrenaline, Adrenaline, Phenylephrine and Serotonin (5-hydroxytrptamine; 5-HT) were recorded in rats of both models. A cumulative concentration response curve of 5-HT was carried out in isolated rat fundus strip of the DOCA-salt induced and fructose induced hypertensive rats. The results tend to suggest that HF possesses antihypertensive activity.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.230-231
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• 2019

The nuclear power plant construction project is large-scale, has various stakeholders and computer system, and is produced and managed a large amount of information. The domestic nuclear power plant construction project has accumulated data based on many years of experience in the system. It has the competitiveness to suggeest alternatives that meet the requirement of the client in the overseas nuclear power plant project. Earned value management, which integrates schedule and cost, is possible to risk management. It was developed the earned value management system considering the the actual data properties and types of the preceding nuclear power plant construction projects. It will be able to increase the nuclaer power plant export competieiveness. Therefore, it was palned to carry out future stuies so that it be able to complement the measure to integrate cost and schedule in consideration of actual data(quantity of activity, etc.).