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矢狀分割骨折斷術 後 나사固定方法에 따른 應力分布에 관한 有限要素法的 硏究
韓勳,金麗甲 慶熙大學校 齒科大學 1995 慶熙齒大論文集 Vol.17 No.2
A finite element study was done for stress distribution on various rigid fixation methods with screw after sagittal split ramus osteotomy. The purpose of this study was to analyze the various methods used for screw fixation after sagittal split ramus osteotomy. The fixation methods were classified as the Type I-triangular pattern at 90 degree to the bone surface(2 above and 1 below the mandibular canal), Type II-triangular pattern at 70 degree to the bone surface(2 above and 1 below the mandibular canal), and Type III-linear pattern at 90 degree to the bone surface (3 above the mandibular canal). Also the applied direction of force was classified as the anterior, premolar, and molar area with 100 Kg F/cm2 on each region. The results were as follows 1. The stress was mainly concentrated on the condylar neck of the mandible and the superior area of proximal bone fragment after sagittal split ramus osteotomy with screw fixation 2. The stress acting on the screw was principally shear stress, which cause the screw to bend, and increased in magnitude as the applied force was moved from posterior to anterior, and increased in angulated case than perpendicular case. 3. The triangular pattern was clinically more favorable compared to the linear pattern, because the stress distribution on the screw was comparably uniform, and inferior screw significantly contributed to prevent the screw bending 4. The perpendicular pattern to the bone surface was clinically more favorable than the angulated pattern, because the actual differences of shear stress on the screw was increased as the applied force was moved from posterior to anterior.
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중소규모 사업장의 산업재해 예방을 위한 정부 정책의 효과성 분석: 경영진 리더십과 안전 규정의 매개효과를 중심으로
한훈 국제문화기술진흥원 2024 문화기술의 융합 Vol.10 No.6
본 연구는 중소규모 사업장의 산업재해 예방을 위한 정부 정책의 효과성을 분석하고자 하였다. 특히 고용노동부의 감독과 산업안전보건공단의 지원 활동, 그리고 산업안전보건법과 중대재해처벌법에 대한 인지도가 산업재해 발생률에 미치는 영향을 경영진 리더십과 안전 규정의 매개효과를 중심으로 검증하였다. 연구 방법으로는 산업안전보건연구원의 제10차 산업안전보건 실태조사 통계자료를 활용하여 689개 중소규모 제조업체를 대상으로 분석을 실시하였다. PROCESS macro를 이용한 매개효과 분석 결과, 산업안전보건법과 중대재해처벌법에 대한 인지도가 산업재해 발생률 감소에 유의미한 직접효과와 간접효과를 미치는 것으로 나타났다. 반면 고용노동부의 감독 활동은 유의미한 효과를 보이지 않았으며, 산업안전보건공단의 지원 활동은 안전 규정 강화를 통해 간접적으로 산업재해 발생률 감소에 기여하는 것으로 나타났다. 경영진 리더십과 안전 규정은 모든 모델에서 산업재해 발생률에 유의한 영향을 미쳤다. 이러한 결과를 바탕으로 본 연구는 법규 인지도 향상을 위한 교육 프로그램 강화, 안전 규정의 실효성 제고를 위한 지원 체계 강화, 경영진의 안전 리더십 강화 프로그램 개발, 산업안전보건공단 지원 활동의 다각화, 그리고 고용노동부 감독 방식의 개선 등을 제안하였다. 본 연구의 결과는 중소규모 사업장의 산업재해 예방을 위한 효과적인 정책 수립에 기여할 수 있을 것으로 기대된다. This study aimed to analyze the effectiveness of government policies for preventing industrial accidents in small and medium-sized workplaces. In particular, it examined the impact of the Ministry of Employment and Labor's supervision, the Korea Occupational Safety and Health Agency's support activities, and awareness of the Occupational Safety and Health Act and the Serious Accidents Punishment Act on the incidence of industrial accidents, focusing on the mediating effects of management leadership and safety regulations. The research method involved analyzing 689 small and medium-sized manufacturing companies using statistical data from the 10th Occupational Safety and Health Status Survey conducted by the Occupational Safety and Health Research Institute. Mediation effect analysis using PROCESS macro revealed that awareness of the Occupational Safety and Health Act and the Serious Accidents Punishment Act had significant direct and indirect effects on reducing the incidence of industrial accidents. On the other hand, the Ministry of Employment and Labor's supervisory activities did not show significant effects, while the Korea Occupational Safety and Health Agency's support activities indirectly contributed to reducing industrial accident rates through strengthening safety regulations. Management leadership and safety regulations had significant effects on industrial accident rates in all models. Based on these results, this study proposed strengthening educational programs to improve awareness of regulations, enhancing support systems to increase the effectiveness of safety regulations, developing programs to strengthen management's safety leadership, diversifying the Korea Occupational Safety and Health Agency's support activities, and improving the Ministry of Employment and Labor's supervision methods. The results of this study are expected to contribute to the establishment of effective policies for preventing industrial accidents in small and medium-sized workplaces.
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Preparation and Properties of Nylon 4/6 Copolymer Nanofibers Containing Silver-Zeolite Nanoparticles
한훈,김준호 한국섬유공학회 2018 Fibers and polymers Vol.19 No.2
Nylon 4/6 copolymer has desirable properties, such as high affinity to water and good tensile strength. These properties originate from the characteristics of nylon 4 and nylon 6. Zeolite is a good adsorptive material that has many pores in its structure and the ability to capture metallic ions. As a multifunctional additive, silver-ion-loaded zeolite nanoparticles were used to increase the moisture regain and impart antimicrobial properties to the nylon 4/6 copolymer. A nylon 4/6nanofiber web was prepared by electrospinning from a polymer solution containing silver zeolite nanoparticles. The moisture regain of the nylon 4/6 nanofiber web increased with increasing amount of silver zeolite added. The web showed excellent antimicrobial activity against Klebsiella pneumoniae and Staphylococcus aureus. Overall, the nylon 4/6 nanofiber web could be a good material for wound healing dressings and high functional medical filters.
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