인간공학적 접근을 통한 어묵 제조업체의 작업관련성 근골격계 질환 유해요인 개선

양성환,조문선,강영식,Yang Sung-Hwan,Cho Mn-Son,Kang Young-Sig 대한안전경영과학회 2005 대한안전경영과학회지 Vol.7 No.4

The goal of this study is to propose the improved scheme that prevents the workers against musculoskeletal disorders at a fishcake manufacturing company, A questionnaire and an ergonomic assessment method were adopted to analyze the symptoms of workers' musculoskeletal disorders, and an analysis of working postures and a quantitative assessment on various processes were performed to find out harmful factors of workplace. Based on the result of the evaluation, to enhance the working environment, improvement of worktable, working space, tools, and outfit was suggested, and induction of mechanical system was also suggested. Suggested improvement plan was applied to the workplace step by step and it is confirmed that improvement plan can removes the injurious factors of musculoskeletal diseases effectively.

디젤엔진용 연료분사장치 제조업체의 근골격계 질환 유해요인 조사 사례연구

양성환,조문선,강영식,Yang, Sung-Hwan,Cho, Mun-Son,Kang, Young-Sig 대한안전경영과학회 2009 대한안전경영과학회지 Vol.11 No.2

The goal of this study is to propose the effective method of investigating the injurious factors and making improved plans that prevents the workers against musculoskeletal disorders at an diesel engine manufacturing company and the same business field with similar working conditions and process. A questionnaire were adopted to analyze the symptoms of workers' musculoskeletal disorders, and an ergonomic assessment method such as RULA, OWAS were performed to find out harmful factors of workplace and working posture. Based on the result of the evaluation, to enhance the working environment, improvement of worktable, working space, tools, and outfit was suggested, and induction of mechanical system was also suggested. It can be concluded that the method and process described in this paper could be helpful for diagnosing the musculoskeletal disorders and making improvement plans to the diesel engine fuel injection system manufacturing company and the same business field with similar working conditions and process.

근골격계질환의 실태조사 및 분석연구

양성환(Sung Hwan Yang),박범(Peom Park) 대한설비관리학회 2002 대한설비관리학회지 Vol.7 No.2

N/A The purpose of this study is to provide the basic data of the evaluation methodology in order to apply the ergonomic program for industrial workplace. The result is helpful to establish the improvement alternatives that considered the assessment tools suitable work characteristics in order to prevent musculoskeletal disorders in workplace. The approach of this study will help to more precise assessment of the ergonomic work postures when establishing the ergonomic improvement plan.

수평거리에 따른 요배근력과 척추기립근의 근전도 변화

양성환(Sung Hwan Yang),김종인(Jong In Kim),최정화(Jeong Hwa Choi),갈원모(Won Mo Kal),박범(Peom Park) 대한설비관리학회 2001 대한설비관리학회지 Vol.6 No.1

N/A This study evaluated the compression force at the L5/S1 disc using back strength and IEMG(Integrated Electromyography). We divided the distance into one-half, three-fourth and full, measured the back strength. The results showed significant difference much among the cases. IEMG values were analyzed under the condition of fixed vertical factor, two horizontal factors, and 2 times per minute for the stoop posture. As the result, there are significant differences between horizontal distance 35cm and 55cm. This result showed that back strength decreased and the motor units of erector spinae muscle increased as the horizontal distance increased. Therefore, decreasing the horizontal distance to decrease compression force at L5/S1 is important on preventing a low back pain. Also, by using these data for prediction musculoskeletal disorders if we design equipment, machine and apparatus for human welfare, we can give advantage of prevention of low back pain much. We will be able to apply these data to work method or workplace lay-out.

작업자세에 대한 인간공학적 평가 도구들의 비교

양성환(Sung-Hwan Yang),전순호(Sun-Ho Jeon) 한국안전교육학회 2001 한국안전교육학회지 Vol.4 No.1

One of the major requirements in preventing Work-related MusculoSkeletal(WMSDs) is to know definitely what vigorous exertion requirements are contained in a job. This requires improved job analysis tools which can accurately evaluate potentially harmful stresses to the enough to motivate job changes, Therefore, the development of ergonomic evaluation tools for the jobs are important to ergonomics. The main objective is compared of the ergonomic evaluation tools which were developed in the foreign. There are many various anthropometric characters, cultural background knowledge, and scope of ages. So, it is priory needed to research of the ergonomics about Korean characteristic work by physiology and biomechanics.

소아에서의 갑상선 종양

양성환(Sung Hwan Yang),김갑태(Gab Tae Kim),오성수(Sung Su Oh),정을삼(Eul Sam Chung) 대한두경부종양학회 1998 대한두경부 종양학회지 Vol.14 No.1

Objectives: We'd like to give help in diagnosis and treatment of children's thyoid tumor through our clinical experiences and reference consideration. Materials and Methods: The authors report their experiences with 33 cases of thyroid tumor in patients younger than 16 years of age who were treated at Presbyterian Medical Center from 1979 to 1995. Results: 1) Girls were more predominant than boys by a ratio of 5.6:1. The peak incidence was in the 15 years old of age. 2) The final diagnosis in the 33 patients were thyroid carcinoma in 12 cases, nodular goiter in 6 cases, adenoma in 6 cases, Graves disease in 4 cases, Hasimoto's disease in 4 cases and cyst in 1 case. 3) All of 12 patients with thyroid cancer had nodular tumor. 4) In 5 of 6 patients with palpable cervical lymphadenopathy, the final diagnosis was thyroid carcinoma. 5) Delayed diagnosis arose in 6 of 12 thyroid carcinomas which were treated for long periods as benign disease. 6) The surgical procedures were total thyroidectomy in 3 cases, subtotal thyroidectomy in 13 cases and thyroid lobectomy in 17 cases. 7) 11 of 12 patients with thyroid carcinoma had subtotal or total thyroidectomy with lymphnode dissection and only one had lobectomy. 8) The overall rate of postoperative complication was 3%(1 of 33 patient). 9) Postoperative 131I therapy was done in 7 case because of recurrence and distant metastasis in six and severe local invasion in one. 10) In thyroid cancer, the metastatic rate of lymph node at initial surgery was 81%(9/11) and rate of recurrence was 50%(6/12). 11) Patients with thyroid carcinoma were followed up for a mean of 12 years but only one died as a result of thyroid carcinoma 3.5 years later. Conclusion: The authors suggest that thyroid tumors in childhood should receive the benifit of joint management by endocrine pediatrician and experianced surgeons with an agreed protocol of diagnosis and management. We, also, recommend aggressive surgical and 131I treatment as the most effective regimen for children with thyroid carcinoma.

대칭과 비대칭 인양시의 생체역학적 요추부하 비교

양성환(Sung Hwan Yang),최정화(Jeong Hwa Choi),박범(Peom Park) 대한설비관리학회 2001 대한설비관리학회지 Vol.6 No.3

N/A The purpose of this study was to quantitatively prove the asymmetric lifting acts on the risk factor of low back pain by a comparison of muscle activities of spinal loading and muscle strength(hand grip and back strength) between two types of lifting tasks(symmetric and asymmetric). Fourteen male subjects were participated in the experiment. We analysed and compared hand grip force, back strength, EMG(Electromyography), and IEMG(Integrated Electromyography) values for the stoop posture between symmetric and asymmetric lifting tasks using paired t-test. As the result, the back strength decreased in twisting posture. According to the result of EMG analysis, there were significant differences between right and left erector spinae muscle in asymmetric lifting task regardless of load. When subjects lifted boxes of right side, EMG values of left muscle were higher than those of right muscle. As twisting angle increased, EMG values of left muscle increased and EMG values of right muscle decreased. The results of IEMG analysis were similar to the results of EMG analysis. The results of EMG values during lifting indicated that the take-of stage was most stressful.

인간공학적 접근을 통한 화학제품 제조업체의 설비개선 방안 연구

양성환 ( Sung Hwan Yang ) 대한설비관리학회 2010 대한설비관리학회지 Vol.15 No.2

The goal of this study is to propose the effective method of making improvement plans that prevents the workers against musculoskeletal disorders at chemical product companies and the same business field with similar working conditions and process. A questionnaire were adopted to analyze the symptoms of workers` musculoskeletal disorders, and an ergonomic assessment method such as RULA, OWAS were performed to find out harmful factors of workplace and working posture. Based on the result of the evaluation, to enhance the working environment, improvement of worktable, working space, tools, and outfit was suggested, and induction of mechanical system was also suggested. It can be concluded that the method and process described in this paper could be helpful for diagnosing the musculoskeletal disorders and making improvement plans to the chemical product companies and the same business field with similar working conditions and process.

몸통 굽힘자세에 대한 근육활동량에 관한 연구

김대성 ( Day Sung Kim ),양성환 ( Sung Hwan Yang ),문명국 ( Myung Kug Moon ) 대한설비관리학회 2011 대한설비관리학회지 Vol.16 No.4

When applying various evaluation tools that analyze work posture risk through observation, accurate measurement of body flexion angle is very important. This study is to investigate differences of flexion angle at reference positions of 6 participants in the same work posture. Six types of trunk flexion postures(0°, 15°, 20°, 30°, 45°, 60°) were constructed using the Poser 6.0 program. Electromyo- graphy(L3/L4 elector spine left, right) for trunk flexion was determined. As a results, muscle activation revealed no significant differences between male and female, but the most significant differences in trunk flexion angle are seen. In general, the muscle activities of the elector spine increased significantly as the trunk angle increased. In this study, however, the muscle activities was lower in the trunk flexion angle 60°than 30°and 45°. Thus, performing the practical and various study for the trunk flexion angle is re quired for the accurate analysis of working postures.\

가토 정맥에서 CT 조영제의 혈관외유출 예방을 위한 EDA 시스템의 실험적 연구

권대철,정석희,양성환,조문선,장근조,김순근,유병규,이종석,Kweon, Dae-Cheol,Jeong, Seok-Hee,Yang, Sung-Hwan,Cho, Mun-Son,Jang, Keun-Jo,Kim, Sun-Geun,Yoo, Beong-Gyu,Lee, Jong-Seok 한국의학물리학회 2006 의학물리 Vol.17 No.4

CT 검사에서 조영제 혈관외유출을 예방하기 위해 EDA 시스템을 개발하여 가토를 대상으로 실험적으로 혈관외유출의 검출 효율을 평가하였다. 7마리의 가토 IV 정맥 부위에 EDA 시스템의 스트레인게이지를 부착하여 조영제를 주입하면서 혈관외유출 검출 효율을 평가하였다. 조영제의 혈관외유출은 7건으로 혈관외유출 용량 $14{\sim}23ml$ (평균 18.86 ml), 혈관외유출 발생시간 평균 11.29초, 평균압력 109.71 psi, EDA 시스템에서 스트레인게이지의 분해능 평균 512.18, 진양성 7건, 진음성 19건, 위양성 2건이었고, 민감도 100%, 특이도 90%로 나타났다. 개발된 EDA 시스템을 가토에 실험적으로 적용하여 소량의 혈관외유출 조영제를 검출하는 효율이 있어 혈관외유출을 예방하는 효과가 있다. To assess the ability of an extravasation defection accessory (EDA) to detect the clinically important extravascular Injection of iodinated contrast material that was delivered with an automated mechanical power injector. The purpose of this study was to assess the ability of this device during clinically important episodes of extravasation. The EDA system was composed of a strain gage, an amplifier and a computer-based system. In the rabbit experimental cases, there were seven true-positive cases (range of the extravasation volumes: $14{\sim}23 ml$). The algorithm results showed seven true-positive cases (range of the extravasation volumes: $7{\sim}16ml$), nineteen true-negative cases, two false-positive cases and no false-negative cases. The EDA system had a sensitivity of 100% and a specificity of 90% for the detection of clinically important extravasation. The EDA system had good sensitivity for the detection of clinically important extravasation and the EDA system has the clinical potential for the early detection of extravasation of the contrast medium that is administered with power injectors.