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직독식 기기를 이용한 양돈작업자의 신체부위별 PM<sub>10</sub> 노출 특성 비교 연구
신소정,김효철,김경란,서민태,박수인,김경민,김경수,Sin, Sojung,Kim, Hyocher,Kim, Kyung-ran,Seo, Mintae,Park, Sooin,Kim, Kyungmin,Kim, Kyungsu 한국산업보건학회 2019 한국산업보건학회지 Vol.29 No.2
Objectives: The purpose of this study was to evaluate the personal exposure to $PM_{10}$ by body parts for the development of dust monitoring wearable device for swine farmers. Methods: Tasks were classified by using motion pictures taken by action cameras attached to swine farmers. Concentrations of $PM_{10}$ were measured by attaching direct-reading instruments at the head, neck and waist of worker. Differences of $PM_{10}$ exposure between body parts were analyzed with linear regression. Results: We identified three tasks(vaccination, moving pigs, and manure treatment). $PM_{10}$ concentration during vaccination was the highest among the tasks, and the body part showing the highest concentration of $PM_{10}$ was the waist regardless of task. In all tasks, the closer distance between the body parts, the higher were the R-squared values(vaccination 0.4221, moving pigs 0.6990, and manure treatment 0.2164). Conclusions: We presumed that $PM_{10}$ concentrations were affected by the parts of the body in which they were measured. In order to develop swine farmer's wearable device for monitoring dust concentration in air, the determination of the positions of monitoring sensor to ensure accurate measurement is essential. Considering the results of this study, wearable sensor should be positioned at the waist.
농작업현장에 적용 가능한 안전보건 기술지침 항목 선정에 관한 연구
정원건 ( Wongeon Jung ),김경수 ( Kyungsu Kim ),서민태 ( Mintae Seo ),김효철 ( Hyocher Kim ) 한국산업보건학회 2021 한국산업보건학회지 Vol.31 No.4
Objectives: This study aimed to select items for technical guidelines through the guidelines of the Korean Occupational Safety and Health Agency (KOSHA) for agricultural workplaces. Methods: All 1,308 guidelines provided by KOSHA were reviewed and categorized using a Delphi technique questionnaire on their compatibility and urgency. Results: Among all the KOSHA guidelines, 100 items related to agricultural workplaces were selected. After that, two Delphi questionnaires were conducted and 46 items were finally selected. The average compatibility was calculated as 4.26, and urgency was 2.39. As a result of measuring the content validity of 46 items, six items were identified that were not relevant to agriculture. The final selected items were classified into four categories: Health examination and management, machinery standards, safety and health standard guides, and workplace environment management. Conclusions: The various risk factors at agricultural workplaces should be prevented and managed. It was shown that related technical guidelines or work standard manuals should be prepared. The technical guidelines of KOSHA will be provided as basic categories in the agricultural sector.
농산물 가공사업장 발생 안전사고 사례에 대한 근본 원인 분석
정원건(Wongeon Jung),김경란(Kyungran Kim),김효철(Hyocher Kim),서민태(Mintae Seo) 대한인간공학회 2021 大韓人間工學會誌 Vol.40 No.6
Objective: The purpose of this study was to investigate the cases of safety accident that occurred in Agricultural Product Processing Plants (APPPs), and the root cause and system of safety were analyzed by using logic tree diagraming method. Background: Local rural development organizations have been expanding agricultural processing-related facilities by supporting related education and starts-ups in order to increase non-agricultural income and create jobs. However, since the machinery and equipment of agricultural processing plants use high-pressure, high-temperature, and high-speed rotation, workers are exposed to various risks. Since the number of safety accidents occurring at APPPs is increasing every year, it is necessary to manage and control the characteristics of accidents. Method: The cases of 29 safety accidents that occurred in 10 APPPs were collected. Demographic characteristics and risk factors were investigated for 29 people who experienced accidents. In addition, logic tree diagraming method was conducted in order to analyze root causes and systems of safety. Results: For the rate of 29 accidents by type of accident risk, high-temperature (41.4%) was identified as the highest rate, followed by excessive force/movement (20.7%), bump (13.8%), and jammed (6.9%). As for the type of injury, burns (48.3%) had the highest rate, followed by musculoskeletal disorders (20.7%), incised wound (10.3%), and cut (6.9%). Fracture, amputations, and stabbed were 3.4%, respectively. As results of logic tree diagraming method, 119 root causes were derived, which were classified into six categories in systems of safety. The most common system of safety was mitigation (28.6%), followed by design (23.5%), personal protective equipment (19.3%), training (17.6%), warning (9.2%), and communication (1.7%). Conclusion: It was confirmed that the accident types in APPPs were similar to those in general industries, and it was determined that control and management of burn accidents were necessary. In addition, it is considered that measures such as installing protective devices, attaching warning signs, and wearing appropriate personal protective equipment are necessary to minimize the risk of APPPs. Application: It is hoped that the results of this study will be utilized in the development of safety guidelines, checklist items, and manuals for the prevention of safety accidents for workers in APPPs.
고령 농업인을 위한 하지 외골격 설계 요소 정의 및 개발
최경희(Kyeong-Hee Choi),공용구(Yong-Ku Kong),금현지(Hyunji Keum),손승재(Seungjae Son),이도경(Dokyeong Lee),양현석(Hyunseok Yang),김승연(Seoung-Yeon Kim),서민태(Mintae Seo),심현호(Hyun-Ho Shim) 대한인간공학회 2024 大韓人間工學會誌 Vol.43 No.2
Objective: The aim of this study was to define the design factors of a lower-limb wearable exoskeleton that aids in reducing the workloads of elderly farmers. Background: Musculoskeletal disorders related to agricultural work have been raised as a very important problem as the aging population progresses. Especially, the loads of back and lower-limb caused by squatting, and awkward posture like knee or back flexion posture are serious problems because most of the agricultural work consists of atypical work. Therefore, the need to develop a wearable lower-limb assistance device that can reduce the load on the lower extremities caused by agricultural work has recently emerged. Method: In this study, the design of the lower-limb wearable exoskeleton device was classified into three parts: thigh support; calf support; and knee joint connecting thigh and calf supports. First, hip and knee heights, thigh, mid-thigh, and knee circumferences were used to define dimensions for the thigh support. Second, calf height and lower knee, maximum calf, and minimum calf circumferences were used to define dimensions for the calf support. The center height and circumference of each support were set based on these measurements. Finally, in the case of the knee joint, the length between the centers of the thigh and calf support was used. Results: As a result, the specific dimensions were as follows based on the 8th Size Korea. For the thigh support, the center height was 623.7mm; upper, mid, and lower circumferences were 232.1mm (92.3R), 200.8mm (79.9R), and 173.4mm (69.0R), respectively. For the calf support, the center height was 318.6mm; upper, mid, and lower circumferences were 137.7mm (54.8R), 144.9mm (57.6R), and 115.1mm (45.8R), respectively. For the knee joint, the center height was 445.4mm; the length of the knee joint was 305.1mm. Conclusion: In this study, design factors of lower-limb exoskeleton for agricultural work were defined. The lower-limb exoskeleton was classified into three parts: thigh support, calf support, and knee joint. In the case of the support part, center height, and circumference were defined. Then, the length and angle of the knee joint were also defined. Application: It is expected to develop a wearable lower-limb exoskeleton device that can be applied to actual agricultural work in the future through continuous improvement and usability evaluation.