• Journal of the Korea Convergence Society
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• v.12 no.5
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• pp.207-215
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• 2021

A forklift is an industrial vehicle with a power-operated fork for lifting and moving heavy loads over short distances. A significant number of accidents are caused by forklifts every year. Most of them are known to be caused by the unsafe acts of workers. However, only a few studies have focused on the risks of forklift work from the perspective of human error. In addition, various methods have been developed to analyze the risk of human error, while it is hard to find studies that directly compare the effectiveness or strengths/weaknesses of those methods. This study aims to analyze risk factors related to unsafe behavior in forklift operations using two representative human error analysis techniques, i.e., .SHERPA and HE-HAZOP, and compare their advantages and disadvantages. The analysis was performed on three main forklift operations ('unloading from the truck', 'moving and loading into the storage', and 'loading on the truck'). As a result, 118 errors and 34 remedial measures were derived by SHERPA. Through HAZOP, 139 errors and 54 measures were derived. The two techniques were compared in terms of the number of results and the method of deriving errors and remedial measures, cause analysis, and risk assessment. This study might be used to reduce human error related disasters in workplaces using forklifts. In order to provide a guide for choosing an appropriate analysis method, more comparative studies on different techniques involving wide range of tasks are needed in the future.

• Tunnel and Underground Space
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• v.24 no.1
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• pp.11-20
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• 2014

This study analyzed the optimal routes of auxiliary vehicles in an open-pit mine that need to traverse the entire mine through many working points. Unlike previous studies which usually used the Dijkstra's algorithm, this study utilized a heuristic algorithm for the Traveling Salesman Problem(TSP). Thus, the optimal routes of auxiliary vehicles could be determined by considering the visiting order of multiple working points. A case study at the Pasir open-pit coal mine, Indonesia was conducted to analyze the travel route of an auxiliary vehicle that monitors the working condition by traversing the entire mine without stopping. As a result, we could know that the heuristic TSP algorithm is more efficient than intuitive judgment in determining the optimal travel route; 20 minutes can be shortened when the auxiliary vehicle traverses the entire mine through 25 working points according to the route determined by the heuristic TSP algorithm. It is expected that the results of this study can be utilized as a basis to set the direction of future research for the system optimization of auxiliary vehicles in open-pit mines.

• Journal of Korean Society of Forest Science
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• v.90 no.3
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• pp.388-397
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• 2001

In forestry, where improvement of labor environment is quite impossible, improved posture would result in direct effects by preventing waste of physical strength, prevention of accidental injury caused by fatigue accumulated on certain body parts, and prevention of human error by inattentiveness due to weakened body. Therefore, this research carried on analysis of working posture in manual forest work(thinning using chain-saw, salvage cutting using chain-saw, clearing using hand saw, clearance of twiner using sickle, pruning using saw with a long handle, and tending of young growth using sickle) using OWAS analysis system. According to the OWAS method, percentage of OWAS action categories III and IV in the tasks using chain-saw and sickle was higher than another tasks. For the compared middle skillful worker group and low skillful worker group at felling work using chain-saw, percentage of OWAS action categories IV in middle skillful worker group was 5.1%, and low skillful worker group was 14.1%.

• The Journal of Korean society of community based occupational therapy
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• v.9 no.2
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• pp.43-58
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• 2019

Objective : The purpose of this study was to develop an assessment tool to measure Korean occupational balance. Methods : From March 2017 to July 2019, preliminary questionnaire was prepared through analysis of previous research and expert focus meeting, and preliminary questions were selected through the Delphi survey. In order to verify the validity of the items, Rash analysis was conducted to analyze the persons and items fitness, the distribution of item difficulty, separation reliability, and the appropriateness of the rating scale. Results : Among 141 subjects, 9 (6.38%) in time use and 11 (7.80%) in the occupation area were inappropriate subjects. As a result of analyzing the appropriateness of the items except for the inappropriate subjects, the 3 items were judged as ineligible items, but 1 item of the occupation characteristics was finally deleted based on the theoretical and clinical grounds. In the analysis of the scale, 4 points were more appropriate than the 5 point scale, and the separation reliability was .86~.94. Finally, 3 categories (time use, occupation area, occupation characteristics) and 18 items were selected. Conclusion : The occupational balance assessment tool was selected three categories and 18 questions finally, three categories and 18 questions, and was developed on a four-point Likert scale. Further research needs to prove the concurrent validity of the K-OBA and to analyze the factors that influence the occupational balance.

• Journal of Korean Society of Forest Science
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• v.87 no.2
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• pp.121-130
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• 1998

This study was carried out to investigate working time, productivity, and heart rate during thinning using chain saw in Japanese larch(Larix leptolepis) plantation site for analysis of physical work load, and to investigate maximal oxygen uptake of worker for analysis of maximal work capacity. The real working time was 366 minutes in a day ; about 192 minutes in the a.m., 174 minutes in the p.m.. The ratio of real working time per total working time was approximately 90%. The rate of moving(Mo) to real working times was 26.3, which was the largest one of work elements. Average maximal oxygen uptake, as an asset of personnel performance, was $2.42{\ell}/min$($46.5m{\ell}/kg/min$). During the real working time, average productivity, the mean rate of increase of heart rate, and the mean work load index was $2.62m^3/hr$, 93.2%, and 41.9%, respectively.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.136-138
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• 1998

작업들이 자원을 공유하는 경우 예측하기 어려운 지연시간이 발생한다. 다중 프로세서 시스템에서의 자원공유로 인한 지연시간은 더욱 예측하기 어렵다. 실기간 시스템의 스케줄 가능성 검사를 위해서는 이러한 지연시간을 정확히 예측해야한다. 선점가능한 우선순위 구동 CPU 스케줄링 알고리즘에 의해서 다른 우선순위의 작업과의 동기화는 우선순위 역전 문제를 야기한다. 본 논문에서는 다중 프로세서에서의 동기화 프로토콜을 제안하고 작업의 지연시간을 분석한다. 다른 프로세서에 할당된 작업들이 수행중인 자원을 요구할 때, 자원을 수행하는 작업의 우선순위를 높여줌으로써 자원수행을 빠르게 종료하게 한다. 이로 인해 자원에 의한 지연을 최소화한다. 특히, 높은 우선순위 작업의 경우 더욱 작은 지연시간을 갖게한다. 시뮬레이션을 통한 Shared Memory Protocol [5]과의 비교, 분석 결과 성능의 향상을 보임을 알 수 있다. 다양한 작업집합에 대한 지연시간을 분석하였다.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.11 no.1
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• pp.111-124
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• 2000

The Purpose of this study is to find out the relationships of affective outcomes and work itself performed by librarians. General job satisfaction, internal work motivation and growth satisfaction were set as independent variables in this study. Work effectiveness was set as a dependent variable. The result of multiple regressions by the data from 88 systems librarians who work at university libraries showed that affective outcomes affect work effectiveness, and growth satisfaction is important to affective outcome.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1996.04a
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• pp.162-164
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• 1996

다른 배경음악의 종류와 수준이 어떻게 컴퓨터 문서편집작업의 수행능력에 영향을 주는지를 알아보기위해 18명의 대학생을 대상으로 2인자 혼합인자 실험계획법을 이용하여 실험을 실시하였다. 실험에 사용된 독립변수로는 "클래식, 록, 그리고 한국민속음악"의 3종류를 갖는 음악형태와 "Low (60~65dB), High(80~85dB)"의 2수준을 갖는 음악크기이며, 분석을 위해 수집된 종족변수치는 문서편집작업의 완료시간 및 작업에러수이다. 분산분석을 이용한 통계분석 결과, 높은 (80~85 dB) 배경음악수준하에서는 낮은 (60~65 dB) 수준에 비해 통계적으로 문서편집작업의 완료시간이 많이 걸렸으며, 특히 록음악이 높은 수준으로 연주될때는 낮은 수준에 비해 유의하게 많은 문서편집작업에러가 발생하였다. 많은 문서편집작업에러가 발생하였다.

• Electric Engineers Magazine
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• s.350
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• pp.21-25
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• 2011

전기설비에 접근하여 활선작업을 수행하는 과정에서 "안전조치, 작업공구, 먼지, 분진, 쥐, 절연" 등의 문제로 기인하는 단락사고가 발생하면 플라즈마(plasma) 아크 형태의 전기적 방전이 일어나므로, 아크 플래시 위험에 노출된 작업자는 심각한 화상은 물론 생명에 위험을 초래할 수 있다. 이러한 위험으로부터 근로자를 보호하기 위하여 IEEE Std. 1584에 수행절차와 방법에 대하여 상세히 해설하고 있고, NFPA 70E는 보호기준 등을 규정하고 있다. 국내에서도 이 기준 등을 참고하여 산업안전기준에 관한 규칙에 의거, 활선작업 및 활선근접작업에 관한 기술지침(KOSHA CODE E-3G-2005)과 난연성 전기 작업복 선정에 관한 기술지침(KOSHA CODE E-32-2006을 규정하고 있다. 그러나 국내에서는 외국 기업 일부를 제외하고는 아크 플래시 위험분석 업무를 실무에 적용하는 사례를 찾아보기 어렵다. 또한 적용 범위에 있어서도 난연성 전기 작업복 선정에 관한 기술지침을 600V 이상의 활선작업 및 활선근접 작업시만 착용하도록 한정한 것은 아크 플래시 위험에 대한 보호가 충분하지 않은 것으로 판단된다. 오히려 고압보다도 저압회로 고장 지점의 최소 단락전류에서 차단기의 동작시간이 지연되는 경우, 사고에너지를 더 증가시키기 때문에 위험성과 빈도는 높아질 수 있다 이와 관련하여 본문에서는 "아크 플래시 위험" 분석 및 평가방법에 대하여 살펴보기로 한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.07a
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• pp.247-248
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• 2019

본 논문에서는 블루투스 비콘을 이용해 고소 작업장 등의 위험지역에서 작업자 추적 및 확인과 안전 벨트고리를 체결했는지 여부와 작업자의 행동에 따른 데이터를 추가로 수집하여 작업자의 행동 패턴을 분석하였다. IoT 국제 표준인 oneM2M을 기반으로 IoT Device와 Application을 연결하는 중간 매개체로 모비우스 플랫폼을 사용해 시스템을 구축하였다. 또한, 본 연구팀의 선행 연구에서 작업자 위험 행동분류 시스템을 개선할 수 있는 연구 결과를 비교하였다.