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블루베리 수확 작업의 작업자세 분석 및 인간공학적 평가
이인석(Inseok Lee),김용휘(Yonghwi Kim) 대한인간공학회 2019 大韓人間工學會誌 Vol.38 No.4
Objective: The aim of this study is to evaluate the postural load of blueberryharvesting tasks based on continuous observation of working postures and measurement of wrist angles with electronic goniometers. Background: Agricultural workers are known to be highly exposed to various risk factors of musculoskeletal disorders. The blueberry-harvesting workers have to carry out the repetitive manual tasks for a long time in a very hot summer season. Their work has not yet been studied sufficiently for us to understand the postural load of the tasks based on quantitative and objective data. Method: Four female workers were video-recorded while they are carrying out their normal work of blue-berry harvesting. Their tasks were categorized as 3 subtasks of pricking, storing, and miscellaneous. The working postures were continuously observed and categorized according to the postural classification based on REBA using a computer S/W program, CAPTIV. The estimated working time a day for each subtask, the percentage for the categorized working postures of lower arm, upper arm, neck, trunk, and leg, and the mean and maximum sustained times for each posture were analyzed. Their wrist angles were measured using electronic goniometers while they were carrying out their normal work. The positions, movements, and frequencies of the wrist motions were analyzed. Results: It was shown that the workers spent 82% of their working time on picking, with 11.9 sec and 45.0 sec of mean and maximum sustaining time of picking. They took mild or severe bending postures in their trunk for 55.7% of the working time and mild bending in the neck for 50.2% of the working time. They elevated their arms to the shoulder height for more than 60% of the working time, and 11.4% and 26.7% of the working time for squat sitting and unbalanced standing, respectively. The maximum sustaining times for mild and severe bending for the trunk are 56.9 sec and 37.3 sec, respectively, and 72.9 sec, 56.0 sec, and 46.6 sec for the mild bending of neck, severe arm elevation, and squat sitting, respectively. It was found that the workers mostly assumed extended wrist postures, though the workload on the wrist seemed to be moderate according to the positions, movements, and frequencies of wrist flexion/extension and deviations, as compared to previous studies of other repetitive work. Conclusion: It was shown that the workers have to carry out the picking tasks in the most time. They took non-neutral postures in the trunk, arms, legs and neck for the most of the working time. It can be resumed that the workers are very highly exposed to the risks of musculoskeletal disorders. Application: The results of this study can be used as a basic and practical data for the study for preventing musculoskeletal disorders of blueberry-harvesting workers.
전자 제조업에서 광치료가 교대 근무자의 심박변이도에 미치는 영향
이인석(Inseok Lee),모승민(Seung-Min Mo) 대한인간공학회 2021 大韓人間工學會誌 Vol.40 No.6
Objective: The purpose of this study is to analyze heart rate variability on the light therapy for shift worker in electronics industry. Background: Although the shift work system could be improved productivity, it has been reported that the inconsistency of the circadian rhythm negatively affects worker"s health such as physical, psychological and psychosocial activities. Method: This study participated in eighteen female workers in their 20s and 30s. They have been working in shift for more than six months in the electronics manufacturing process. For the heart rate signal measured during work, heart rate signals were sampled in a continuous 60-minute interval within 120 minutes after the starting (early) and before ending (last) of the working period. This study evaluated the time domain heart rate variability (HRV) of Mean NN, SDNN, SDANN, SDNN index, RMSSD and pNN50. For the Wilcoxon signed-rank test, this study analyzed the significant difference between the HRV in the early and last of working period according to the light therapy. Results: For the non-light therapy group, there were significant difference of HRV of Mean NN, RMSSD and pNN50 between early and late of working period. These HRV were analyzed to be significantly increased in the late of working period than in the early work period. In non-light therapy group, most of HRV showed high variability. This reason is that worker"s psychological tension was alleviated in relation to the finish time at the late of working period. For the light therapy group, there were no significant difference of all HRV between early and late of working period. It showed that the light therapy group should keep maintained stability of autonomic nervous system compared to the non-light therapy group. Conclusion: This study suggested a method that the light therapy could be reduce variability in heart rated and improve stability for shift worker. And RMSSD and pNN50 of HRV could effectively evaluate the activation of the autonomic nervous system among HRV in the time domain. Application: Based on the result of this study, non-invasive light therapy could contribute to the prevention of occupational diseases and improving work quality in the shift work system.
이인석(Inseok Lee),모승민(Seung?Min Mo),공용구(Yong?Ku Kong),송영웅(Young Woong Song),정명철(Myung?Chul Jung) 대한인간공학회 2009 大韓人間工學會誌 Vol.28 No.4
The purpose of this study was to evaluate the legibility of one-syllable Korean characters with the participation of sixteen subjects. The experiment considered nine factors including age (young and old), gender (male and female), illuminance (150lx and 600lx), viewing distance (50㎝ and 200㎝), material type (paper and LCD), typeface (Ming and Gothic), thickness (plain and bold), color contrast (black letter/white background and white letter/black background), and complexity (simple, complex, and number) to examine main effects with a 2<SUP>6-3</SUP>×3 fractional factorial design. The dependent variables were minimum character size of 100% correctness, maximum character size of 0% correctness, and minimum character size of comfortable reading preference. The results of analysis of variance (ANOVA) revealed that age, illuminance, viewing distance and complexity were significant for all dependent variables, except gender which was significant only for the minimum character size of comfortable reading preference. In general, the young could see twofold smaller size letters than the elderly. The subjects could see smaller sized letters with the illuminance of 600lx and viewing distance of 50㎝ than 150lx and 200㎝, respectively and also with numbers, simple characters, and complex characters in that order. The findings of this study could be characterized about the legibility of Korean characters and be good resources for developing its standard.
이인석 ( Inseok Lee ) 대한췌장담도학회 2021 대한췌담도학회지 Vol.26 No.4
내시경 검사는 지난 반세기 동안 광학기술의 발달과 다양한 보조기구의 개발로 눈부신 발전을 이루어 왔다. 특히 췌장담도 분야의 내시경 검사와 시술은 고난이도의 술기이며 전문적인 시술을 이루기 위해서는 별도의 수련과정이 필요하며 시술 연관 합병증이 발생하지 않도록 늘 조심해야 한다. 전문 의학분야에서 인정의 제도는 대한의학회에서 세부·분과전문의 제도로 운영되고 있으며 해당 세부·분과전문 분야의 우수한 자질과 능력을 갖춘 임상의사를 양성함으로써 학문과 의료기술의 발전에 공헌하고 의사 개인의 자기 발전을 도모하며 국민 보건 향상에 기여함을 목적으로 시행되고 있다. 우 리 나 라 건 강 보 험 제 도 는 국 민 의 질 병 · 부 상 에 대 한 예방·진단·치료·재활과 출산·사망 및 건강 증진에 대하여 보험급여를 실시함으로써 국민보건을 향상시키고 사회보장을 증진함을 목적으로 하고 있다(국민건강보험법 제1조). 내시경역행담췌관조영술 (endoscopicretrograde cholangiopancreatography, ERCP) 인증의 역시 고난이도의 시술을 시행하는 의사로서 전문성을 유지하여 국민보건을 향상시키는 것을 목적으로 하고 있다. 본고에서는 인증의 제도가 국민건강보험제도에서 어떻게 반영되고 있는지를 고찰하고, 향후 ERCP 인증의가 국민에게 미치는 영향에 대해 생각해 보는 시점이 되고자 한다. 이를 통해 ERCP 인증의 제도가 올바르게 자리매김을 하고 오로지 국민건강향상을 위해 운영되고자 국내의 현황과 제도를 알아보고자 한다. Pancreatic and biliary endoscopy certified doctors perform high-level procedures and try to improve public health by maintaining professionalism. In this manuscript, I review how the certification system is reflected in the Korean National Health Insurance. In addition, we considered the impact of certified pancreatic and biliary endoscopy doctors on the public. Through this, the pancreatobiliary endoscopy certification system is to be properly established and to contribute to the improvement of public health. Korean J Pancreas Biliary Tract 2021;26(4):216-220