• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2006.11a
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• pp.131-136
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• 2006

In constructing projects, there exist various kinds of work interferences, which cause a delay of the outset and completion of planned schedule because of some attributions, such as variability, uncertainty and complexity. and so schedule delay has been treated as a natural phenomenon. To reduce or prevent the schedule delay, a constant confirmation of schedule delay and a preparation of counter plans for finding out the cause structure of schedule delay should have been done. However, all this time the research has been mostly done on the calculation method or claim cases of schedule delay. Moreover, the analysis method did not consider the trait, which cause the schedule delay, in constructing projects. This paper restricts the range of the cause analysis of schedule delay to the field of site management in the projects and divides the cause structure of schedule delay into the cause objects and cause attributes of schedule delay according to the input elements. The system of classifying causes of schedule delay is examined by interviews with experts and questionnaire. Additionally, this paper analyzes the attributes of cause attributes and cause subjects and presents the analysis method and procedure of schedule delay with the application of VSM.

• Journal of Navigation and Port Research
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• v.37 no.3
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• pp.231-237
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• 2013

What to analyze cognitive works that are involved in ship navigation is a basic work to make alternatives for maritime safety such as development of bridge equipments, extraction of potential human errors and development of education/ training methods. In the domains in which much research on the human error has been performed such as aviation and nuclear plant, analysis methods for cognitive work analysis have been developed and applied to them. However, the research on the cognitive work analysis is not sufficient in the maritime domain. This paper proposes a method to analyze cognitive work of ship navigation. The method was developed so that some maritime characteristics and a variety of factors influencing cognitive works are reflected on cognitive work analysis processes. On the other hand, an ship collision accident was analyzed by the proposed method as a case study.

• Proceedings of the ESK Conference
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• 1996.10a
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• pp.33-40
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• 1996

본 연구의 목적은 작업생리학적 접근방법(physiological approach)을 이용하여 생리학적 작업 능력(PWC; physiological work capacity)을 추정할 경우 작업형태와 작업방법에 따른 차이점을 비교분석해 보고자 함이다. 작업유형으로는 자전거 에르고미터(cycle ergometer)와 트레드밀 (treadmill)을 사용하였고, 작업방법으로는 각각의 작업유형에 대하여 램프 테스트(ramp test 와 인크리멘탈 테스트(increemntal test)의 차이점을 비교하였다. 또한 외국인들의 생리학적 작업능력(PWC)과 한국인들의 생리학적 작업능력(PWC)을 비교,검토하여 NIOSH(National Institute of Safety and Healty)기준치를 사용하는데 문제점이 없는가를 검토해 보고자 하였다. 작업방법 에 따른 차이점은 자전거 에르고미터의 경우 램프 테스트(ramp test )253.63 ml/min로서 인크리 멘탈 테스트(increemental test) 2859.74ml/min 의 87.70 % 정도로 나타났으며, 트레드 밑의 경우 ramp test 2859.22ml/min로서 incremental test 289.46ml/min의 98.77%정도로 나타났다. 작업유형 에 따른 결과는 자전거 에르고미터의 ramp test 트레드밀의 ramp test 는 ramp test는 트레드밀의 ramp test의 88.72% 정도로 나타났으며, 자전거 에르고미터의 incremental tests는 트레이드밀 작 업의 98.% 정도로 나타났다.

• Journal of Korean Society of Forest Science
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• v.112 no.3
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• pp.303-321
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• 2023

To develop the Forest Work Load Index (FWLI) for estimating the work intensity of forest workers, a study focused on forest tending was conducted. To estimate the FWLI, we used the Ovako Working Posture Analysis System (OWAS) and the Work Load Index (WLI). The OWAS is a prominent method used for analyzing musculoskeletal load in work tasks, and WLI is a prominent method used for analyzing the work intensity of workers. The PRI values analyzed for each forest tending project were 185.3 (Thinning), 150.6 (Pruning), 181.1 (Thinning for Forest Fire Prevention), and 197.0 (Thinning for Young Trees). The WLI values, calculated on the basis of the measured heart rates, were 59.5% (Thinning), 53.5% (Pruning), 56.2% (Thinning for Forest Fire Prevention), and 62.3% (Thinning for Young Trees). The FWLI was calculated using the analyzed PRI and WLI values. The FWLI values for the forest tending project were 110.2 (Thinning), 80.7 (Pruning), 102.1 (Thinning for Forest Fire Prevention), and 123.0 (Thinning for Young Trees). The FWLI developed in this study can be used to quantitatively compare the workloads of forest workers. In the future, the analyzed FWLI can be used as a basis for improving forest workers' postures and comparing workloads across different forest projects.

• Proceedings of the ESK Conference
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• 1995.10a
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• pp.75-83
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• 1995

본 연구는 12명의 컴퓨터 작업자를 대상으로 테이터 입력 방법과 소음 수준이 데이터 입력 작업 수행도에 미치는 영향을 분석하였다. 다른 형태의 Database Format 및 Interaction Technique을 갖는 3가지 데이터 입력 방법(Card Format/Keyvoard 입력, Card Format/Menu방식을 이용한 Mouse Click, Table Format/Keyboard 입력)과 소음의 2수준(60 .approx. 65dBA, 80 .approx. 85dBA)을 독립실험인자로 채택하였다. 에러 문제를 효율적으로 다루기 위해 에러 방지(error prevention)와 에러 관리(error management)의 두 가지 전략을 고려하여 두 가지 실험을 실시하였다. 실험 1에서는 에러를 효율적으로 예방할 수 있는 데이터 입력 방법 및 작업 환경을 알아보고자 데이터 입력작업 완료시간과 데이터 입력 시 발생하는 에러의 수를 종속변수로 측정하였으며, 실험 2에서는 에러의 효율적인 관리를 위한 데이터 입력 방법 및 작업 환경을 알아보고자 에러수정시간을 종속변수로하여 측정하였다. 통계분석결과, 높은 소음 수준하에서 에러수정시간이 많이 걸렸다. Form Fill-in 형식으로 입력하는 방법을 이용했을 경우 입력작업 완료시간이 적게 걸렸으며 Card format을 갖는 입력방식을 이용했을 때 적은 에러 수정시간을 나타내었다.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 1998.10a
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• pp.671-688
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• 1998

본 논문은 작업그룹의 과업을 수행하는 인지적 과정을 분석하는 방안을 제시한다. 먼저, 그룹의 인지현상을 연구하는 분산인지이론을 검토하고, 기존의 개인 과업 분석 방법론중의 하나인 GOMS를 확장하여 그룹에 적용할 수 있는 분산형 GOMS 방법론을 제안한다. 제안한 분산형 GOMS 방법론을 작업그룹의 실제 사례인 원자력 발전소의 주 제어실 운전반의 한 과업에 시험적으로 적용하여 분석해 본 결과를 제시한다. 각 구성원의 업무 수행 시간, 의사소통시간, 최대인지 부하등을 기초로 작업그룹의 업무 수행시간과 인지 부하의 ？형도를 계산하여 그룹의 과업에 대해 분석하였다.

• The Transactions of the Korea Information Processing Society
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• v.5 no.4
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• pp.904-914
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• 1998

BPR(Business Process Reengineering), a radical improvement approach of business process, has been paying attention, and work-flow management and automation has been concentrated on progress velocity of business process and productivity of engineers. In software engineering, software process engineering which focus to process begin to be watched, and for the purpose of software productivity and quality progress and reduction of development term, study on SPR(Software Process Reengineering) is being progressed. In this paper, made workflow analysis and design method for construction of work-flow management system of software process to stand firm process reengineering methodology. In other words, we studied modeling process methods for SPR process, and software process structure and workflow analysis method which construct software process workflow model and specification definition method of workflow software.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.2 no.1
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• pp.41-51
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• 2004

The cost-effective reduction of occupational radiation dose (ORD) at a nuclear power plant could not be achieved without going through an extensive analysis of accumulated ORD data of existing plants. Through the data analysis, it is required to identify what are the jobs of repetitive high ORD at the nuclear power plant. In this study, Percentile Rank Sum Method (PRSM) is proposed to identify repetitive high ORD jobs, which is based on non-parametric statistical theory. As a case study, the method is applied to ORD data of maintenance and repair jobs at Kori units 3 and 4 that are pressurized water reactors with 950 MWe capacity and have been operated since 1986 and 1987, respectively in Korea. The results was verified and validated, and PRSM has been demonstrated to be an efficient method of analyzing the data.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.947-952
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• 2007

The construction project is composed of individual trade which is consists of each activity. and the performance of each activity is the lowest level to influence the project performance. Consequently, It is essential to measure and evaluate the performance of the each assignment. But the existing performance measurement have mainly focussed on company level and project level. Therefore, this paper select PPC as the indicator of a activity and, suggests the analysis method of indicators for a goal-oriented management and continuous improvement through a statistical control techniques.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2006.05a
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• pp.148-152
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• 2006

제품(또는 서비스)을 생산하기 위하여 여러 순차적인 작업이 수행되어야 하는 환경에서 생산자원(기계 또는 작업자)에게 얼마만큼의 요소작업을 배정하는가를 결정하는 작업배정(Work Assignment) 문제는 중요한 의사결정 문제이다. 일반적으로 이용하는 작업배정 방식은 각 생산자원에게 가급적 균등한 작업량을 배정하는 라인밸런싱(LB: Line Balancing) 전략이다. 그러나 LB 방식은 작업자의 작업속도 차이나 시스템의 여러 가지 변동 상황(기계고장, 품질문제 등)의 고려 없이 작업을 배정하기 때문에 실제로는 계획된 밸런싱효율을 달성하기 어렵다. Bucket Brigade (BB)는 이러한 문제에 대응하기 위한 새로운 작업배정 방법으로 제시되고 있다. BB는 개미의 협력작업 개념을 바탕으로 하는 분산 자율적인 작업배정 방법이다. 본 발표에서는 생산 및 물류시스템에서 BB의 적용 가능성과 문제점을 논의하고, 시뮬레이션을 통하여 여러 작업 환경에서 BB의 수행도를 분석한다.