• Physical Therapy Rehabilitation Science
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• 제6권1호
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• pp.14-19
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• 2017

Objective: To investigate the effect of performing three different bridge exercise conditions on the activities of four different muscles using surface electromyography (sEMG) in healthy young adults. Design: Cross-sectional study. Methods: A total of 20 healthy young adults (10 males, 10 females) voluntarily participated in this study. All subjects randomly performed three different bridge conditions as follows: general bridge exercise, isometric hip abduction (IHAB) with a blue Theraband (Hygenic Corp., USA), and isometric hip adduction (IHAD) with a Swiss ball (Hygenic Corp.). The muscle activities of bilateral erector spinae (ES), gluteus maximus (GM), biceps femoris (BF), and external oblique (EO) muscles during the bridge exercises were measured using sEMG. Subjects performed each of the three bridge conditions three times in random order and mean values were obtained. Results: For bilateral ES and BF, there was a significant increase in muscle activity in the IHAD condition compared to the general bridge and IHAB condition (p<0.05). For bilateral GM, there was a significant increase in muscle activity in the IHAB condition compared to the general bridge condition (p<0.05) and there was a significant increase in muscle activity in the IHAB condition compared to IHAD condition (p<0.05). For left EO, a significant increase was observed in the IHAD condition compared to the general bridge condition (p<0.05). Conclusions: ES and BF muscle activity increases were observed with hip adduction and increased GM activity was observed with hip abduction. These findings may be applicable within the clinical field for selective trunk and lower extremity muscle activation and advanced rehabilitation purposes.

• 한국직업건강간호학회지
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• 제23권2호
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• pp.89-96
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• 2014

Purpose: The purpose of this study is to discover the influence of the working conditions on women workers' occupational stress. Methods: Descriptive method is used to identify women's stress depending on their general working features and conditions by conducting a survey of them in women-dominated service industries. SPSS 18.0 program is used for data analysis and descriptive statistics is presented with standard deviation, frequency and percentage. ${\chi}^2$-test is used as an analysis tool. To figure out factors that influence their stress, logistic regression analysis is used for general features and working conditions as independent variables, and occupational stress as a dependent variable. Results: As a result, among the independent variables, employment status, weekly working hours, career, shiftwork, and work-family-balance are meaningful factors that influence their stress. Temporary workers' stress is 3.65 times higher (p<.001), and workers working over 48 hours a week have 1.97 times higher stress (p<.003). Workers with over 5 years' career are under 1.73 times higher stress (p<.046) and shift workers are under 3.51 times higher stress (p<.001). Work family balance results in 1.93 times higher stress (p<.009). Conclusion: It is necessary to seek how to prevent and manage women workers' stress considering features.

• 한국ITS학회 논문지
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• 제7권6호
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• pp.121-132
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• 2008

최근 들어 고령운전자의 이동편의 및 안전증진을 위한 차량 및 도로시설의 운전환경개선에 대한 관심이 높아지고 있는 실정이다. 본 논문은 65세 이상 고령운전자의 특성을 설문조사를 통하여 분석하여, 일반운전자와 비교한 자기인식 및 운전특성의 차이점을 도출하고, 이를 바탕으로 개선방안을 제시하였다. 분석결과 고령운전자의 통행목적은 출퇴근 50%, 업무 33%로 나타나 자가운전을 하는 고령자의 경우 아직 경제활동을 하는 경우가 많은 것으로 나타났고, 이는 일반운전자와 매우 유사하였다. 고령운전자는 차량선택 시 안전성을 가장 중시하였고, 일반운전자는 브랜드인지도를 더 중시하였다. 그리고 고령운전자는 운전경력이 일반운전자에 비해 상대적으로 오래되어 교통상황에 대한 기술적인 대처능력은 일반운전자와 큰 차이가 없지만, 신체적인 능력저하에 따른 차이, 즉 거리 감각이나 반응속도 등은 일반운전자와 비교하여 차이점을 인식하고 있고 이에 따른 심리적 불안감을 갖고 있다. 또한 고령운전자는 워크로드가 많은 도로환경에 대하여 심리적인 위축감을 크게 느끼는 것으로 파악되어, 향후 도로시설물에 대하여 시인성 향상을 포함한 개선을 통하여 안전한 도로환경을 구축하는 노력이 필요하다.

• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2001년도 정기학술대회
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• pp.227-229
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• 2001

The components of dependability are reliability, availability, maintainability, safety. The dependability thus often designated in terms of RAMS. A guide to the appropriate selection applicable standards on test conditions and statistical analysis is suggested. It includes a general guide to planning, performing and analysing data from reliability tests. The environmental and operational conditions available as IEC standards are referred.

• 한국농촌생활과학회지
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• 제5권1호
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• pp.31-41
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• 1994

The purpose of this study is to analyze the changes of rural housing conditions by comparing the general housing indicators of rural area and those of urban. For those purposes, the indicators that present the housing conditions are set up, and the changes of average housing conditions are analyzed by a region : Shis(cities), Ups, Myons. For the analysis, Population and Housing Census Report and related data were used. Rural housing conditions have become better since the 1960s in the aspect of quality. They are, however, relatively much worse than those of urban areas. The gap of housing conditions between urban and rural housing is big, especially in qualitative indicators, which are housing facilities. Quantitative indicators, which are housing supply rate and ownership rate, are better than urban conditions.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2004년도 춘계공동학술대회 논문집
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• pp.636-647
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• 2004

The objective of this paper is to provide an improved reorder decision policy for general multi-echelon distribution systems utilizing the shared stock information. It has been known that traditional reorder policies sometimes show poor performance in distribution systems. Thus, in our previous research we introduced the order risk policy which utilizes the shared stock information more accurately for the 2-echelon distribution system and proved the optimality. However, since the real world supply chain is generally composed with more than 2 echelons, we extend the order risk policy for the general multi-echelon systems. Since the calculation of the exact order risk value for general multi-echelon systems is very complex, we provide two approximation methods for the real-time calculation. Through the computational experiment comparing the order risk policy with the existing policies under various conditions, we show the performance of the order risk policy and analyze the value of the shared stock information varying with the characteristics of the supply chain.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2003년도 추계학술대회 및 정기총회
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• pp.159-165
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• 2003

The objective of this paper is to provide an improved reorder decision policy for general multi-echelon distribution systems utilizing the shared stock information. Since it has been known that traditional reorder policies sometimes show poor performance in distribution systems, in our previous research we introduced the order risk policy which utilizes the shared stock information more accurately f3r the 2-echelon distribution system and proved the optimality. However, since the real world supply chain is generally composed with more than 2 echelons, we extend the order risk policy for the general multi-echelon systems. Since the calculation of the exact order risk value fur general multi-echelon systems is very complex, we provide two approximation methods. Through the computational experiment comparing the order risk policy with the existing policies under various conditions, we show the performance of the order risk policy and analyze the value of the shared stock information varying with the characteristics of the supply chain.

• 산업공학
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• 제17권3호
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• pp.359-374
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• 2004

The objective of this paper is to provide an improved reorder decision policy for general multi-echelon distribution systems utilizing the shared stock information. It has been known that traditional reorder policies sometimes show poor performance in distribution systems. Thus, in our previous research we introduced the order risk policy which utilizes the shared stock information more accurately for the 2- echelon distribution system and proved the optimality. However, since the real world supply chain is generally composed with more than 2 echelons, we extend the order risk policy for the general multi-echelon systems. Since the calculation of the exact order risk value for general multi-echelon systems is very complex, we provide two approximation methods for the real-time calculation. Through the computational experiment comparing the order risk policy with the existing policies under various conditions, we show the performance of the order risk policy and analyze the value of the shared stock information varying with the characteristics of the supply chain.

• 대한족부족관절학회지
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• 제3권1호
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• pp.62-65
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• 1999

Traumatic dislocation of the peroneal tendon is a rare injury. It should be distinguished from other conditions that can cause pain and disability of lateral aspect of the ankle joint. We experienced a case of chronic recurrent dislocation of the peroneal tendon, which was treated by deepening of the peroneal groove of the lateral malleolus and reattachment of the superior peroneal retinaculum. The clinical result was satisfactory.

• Archives of Plastic Surgery
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• 제42권3호
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• pp.346-350
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• 2015

Brown syndrome is known as limited elevation of the affected eye during adduction. It is caused by a disorder of the superior oblique tendon, which makes it difficult for the eyeball to look upward, especially during adduction. It is classified into congenital true sheath Brown syndrome and acquired simulated Brown syndrome. Acquired simulated Brown syndrome can be caused by trauma, infection, or inflammatory conditions. The surgical restoration of blowout fractures can also lead to limitations of ocular motility, including Brown syndrome. We report on three patients with acquired simulated Brown syndrome, who complained of diplopia and limitation of ocular motility after operations to treat blowout fractures.