들기 작업시 손잡이의 영향에 관한 연구

장성록,배동철 한국안전학회 2003 한국안전학회지 Vol.18 No.2

Despite rapid technological advance and increased automation facilities, many jobs and activities in our living require manual materials handling(MMH). These include wide variety of activities such as moving things, lifting bags, boxes or cartons, etc. Many studies found that handle could affect on maximum acceptable weight of lifting, but there were few studies for the effects of work posture and coupling in lifting tote box. This study performed that ten male college students were required to lift a tote box with and without handle for three postures (bending, straight, right angle posture). From the experiment, following results were obtained. (1) MVC reduced maximum 23% by type of handle. (2) MVC was highest in straight posture, but was lowest in right angle posture. (3) As a result of ANOVA, MVC paid attention to posture and coupling. (p<0.01) (4) To all handle types. biceps brachii activity was increased in right angle posture, but reduced in straight posture. (5) To all posture, biceps brachii activity was most lively in no handle. The results of MVC measurement, subjective rating. EMG analysis, statistic analysis showed that maximum acceptable weight of lifting was influenced by type of handle and straight posture was more comfortable than other postures. Based on these results. it was concluded that acceptable weight of lifting has to differ for work posture and coupling.

인적오류에 의한 항공사고 분석

장성록,황진태,배동철 釜慶大學校 2001 釜慶大學校 論文集 Vol.6 No.-

This study aimed to investigate the human-related causes of aircraft accidents and present the basic data for developing human-error prevention program. Peterson's model of accident causation and Cooper's model of safety culture were applied to analyze the severe causes of aircraft accidents for last 10 years. For analyzing the causes of aircraft accidents, expert's opinion method was adopted. The analyses showed that the overload and decision error were major causes of aircraft accidents. The causes and backgrounds of human error were found with respect to human, tasks, organization.

건설현장 화재예방에 관한 연구 : 용접작업을 중심으로

목연수,장성록,이영섭,고성석 한국산업안전학회 2002 한국안전학회지 Vol.17 No.2

Current fire safety in the construction sites has developed piecemeal over a considerable period of time. However, the law and regulation of fire safety is insufficient to protect fire in the construction sites. The frequency of fire in the construction sites is very rare but it brings longterm deterioration durability of building structure and large scale industrial calamity. There are many process of works and each work deals with many kind of flammable material, so it is very difficult find a proper safety fire prevention. This study executed the questionnaire and fire experiment of the welding work to provide effective fire prevention counterplan.

A Case Study of Ergonomic Evaluation for the Control Rooms of a Petroleum Complex

Seong Rok Chang,Hoon-Yong Yoon,Hong-In Cheng 대한인간공학회 2017 大韓人間工學會誌 Vol.36 No.1

Objective: Two control rooms of a petroleum complex were ergonomically evaluated for this study using diverse drawings of the rooms. The objective of the study is to show the evaluation process and its results, assessment method and essential elements for drawing-based ergonomic evaluation. Background: Ergonomics can enhance the working environment and safety for a control room when implemented effectively. A control room design was examined by ergonomists based on ergonomic principles and well-practiced standards. This study was conducted because a construction consortium wanted to perform an ergonomic evaluation of the control rooms before the construction. Method: A simple evaluation process, composed with a pre-evaluation, an evaluation and a post-evaluation, was employed to carry out the study. ISO 11064, NUREG- 700, NUREG/CR-6150, and CRIOP were reviewed to evaluate the control rooms. The assessment ranges over the control room layout, workstations, display and control, environmental requirements and safety. Three ergonomists participated in the study and performed the evaluation for two months. Results: An experienced consortium of construction companies designed the petroleum complex and control rooms. No significant ergonomic design problems were detected. Quantitative recommendations were provided for the layout and workstation dimensions. Specific design directions were also proposed for environmental requirements and safety. Conclusion and Application: Design advice and minor potential problems were reported as results of the drawing-based ergonomic evaluation. More practical suggestions could be additionally provided if an on-site assessment was conducted. However, the ergonomic evaluation used in this study could be helpful and applied to designing and evaluating other various control rooms prior to their construction.

Effect of Trunk and Upper Arm Angle on Lifting Capacity

Chang, Seong Rok The Korean Society of Safety 2011 International Journal of Safety Vol.10 No.1

Lifting capacity and difficulty of task are influenced by body posture. In RULA and REBA, the body was divided into segments which formed two groups, A and B. Group A includes the upper and lower arm and wrist while group B includes the neck, trunk and legs. This ensures that whole body posture is recorded so that any awkward or constrained posture of the legs, trunk or neck which might influence the posture of the upper limb. This study aimed to measure MVC (maximum voluntary contraction) and subjective judgment in psychophysical method (Borg's scale) according to trunk and upper arm angle and to analyze results statistically. The results of this study were that lifting capacity was more influenced by interaction of body posture rather than angles of each part, and MVC variation according to trunk and upper arms angles should different patterns. This means that we consider the interaction of trunk angles and upper arm angles when we access risk factors of the postures. This survey would be also the basic data to evaluate difficulty of lifting tasks according to body postures ergonomically.

An Experimental Study on the Asymmetric Factor of Load Handling for Korean

Chang,Seong Rok 한국산업안전학회 2001 한국안전학회지 Vol.16 No.5

The twisted posture has been found to be significantly associated with back pain and several types of low back pain. This study was performed to provide information relating to the twisted posture, i.e. psychophysical load handling capacity during asymmetric lifting without trunk flexion. Ten right-handed male subjects performed isometric maximum efforts at 0-90 degree at intervals of 10 degrees of preset trunk twisting angles in both the clockwise and counterclockwise directions. The results from the statistical analysis showed significant differences according to direction and angle of action, and no interaction between two variables. Mean of maximum voluntary contraction(MVC) in the counterclockwise direction was 8% higher than that in the clockwise direction. And MVC was decreased linearly according as asymmetric angle was increased.

인간/시스템안전분야 : 들기작업 시 몸통각도와 상완각도가 작업부담에 미치는 영향에 관한 연구

장성록 ( Seong Rok Chang ),박형구 ( Hyung Gu Park ) 한국안전학회(구-한국산업안전학회) 2009 한국안전학회지 Vol.24 No.2

근골격계 부담작업 개선에 따른 경제적 효과 분석

장성록(Seong Rok Chang),김동준(Dong Joon Kim),박주용(Ju Yong Park),김진우(Jin Woo Kim) 대한인간공학회 2007 대한인간공학회 학술대회논문집 Vol.- No.-

최근 국내 산업현장에서는 근골격계질환으로 인한 산업재해자 수가 급증하고 있는 추세이며, 특히 조선산업에서의 직?간접적인 비용손실이 큰 것으로 나타났다. 이에 따라 근골격계질환 관련 산업재해자로 인해 발생되는 손실의 정량화 및 인간공학프로그램의 도입으로 거둘 수 있는 경제적 효과를 추정하는 연구가 이루어 지고 있다. 본 연구에서는 조선산업의 작업에 대한 유해성을 평가하여, 유해작업을 분류하였다. 또한 세계 굴지의 조선회사 A 사를 대상으로 최근 3 년간(2004~2006)근골격계 질환자를 작업별로 분류하였다. 이를 토대로 작업별 유해성과 근골격계질환자 발생 상관관계를 분석하였다. 이와 더불어 조선산업의 근골격계 부담작업을 개선함으로써 근골격계질환으로 발생되는 손실을 어느 정도 경감시킬 수 있는지를 정량적으로 분석하였다.

들기작업 시 몸통각도와 상완각도가 작업부담에 미치는 영향에 관한 연구

장성록 ( Seong Rok Chang ),박형구 ( Hyung Gu Park ) 한국안전학회 2009 한국안전학회지 Vol.24 No.4

It is well-known that lifting capacity of a worker is influenced by body posture during the task. When a task analyst make use of RULA and REBA Trunk and upper arm angles are recorded in a separate item. It means that the interaction between the angles of two body segments may be ignored in a final score. The NLE(NIOSH Lifting Equation) has been used to supplement this problem. However, there is no study to validate the result of RWL (Recommended Workload Limit) under the existence of interactions between trunk and upper arm angles. The goal of this study was to assess the effect of the interaction between trunk and upper arm angles. Three responses, including NMVC(normalized maximum voluntary contraction), RWL(Recommended Weight Limit) and subjective judgment in psychophysical method (Borg`s scale), were recorded according to the combinations of three trunk angles and nine upper arm angles. The results showed that lifting capacity is highly influenced by interaction of two body segments(trunk and upper arm). It means that the task workload has to be analyzed along with the interaction of trunk angles and upper arm angles when the task analyst assesses potential risk factors on the postures. This study may be able to be a fundamental study to develop an assessment method for lifting task analyses according to body postures.

건축공사 공종별 위험지수 산정모델에 관한 연구

장성록 ( Seong Rok Chang ),고성석 ( Seong Seok Go ),이종빈 ( Jong Bin Lee ) 한국안전학회 2007 한국안전학회지 Vol.22 No.6