• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 춘계학술대회논문집
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• pp.731-739
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• 2002

recently out door stadiums have been built as multi purpose stadium for athletic sports It hold but also various events and huge concerts. in the past, out-door stadium usually was built, but recently the out-door stadium which of the 50 ％ of roof covered by doom have been built increasingly. as the result, the sound obstacle is becoming very important. but a design of sound has become unplaned except some of the stadium, also rarely been built by sound-absorption material. as the result, the purpose of this study is investigating, analyzing the theory for plan of electric acoustic sound, a drawing of acoustic design and measurement a result value, comparison, evaluating a main sound factor with criteria of the Seoul City design. and reservation time, clearness, sound pressure level suitable for using purpose, so the necessary quantities will be added to financial budget of building acoustic design. and For verification, this contains acoustic analyser measurement and computer simulation and this study will find the solution of helping method.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1997년도 추계학술대회논문집
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• pp.93-97
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• 1997

Since the modified membrane element has the same external appearance as the ordinary membrane element, it is not able to apply the thickness variation of sheet metal in the blank holder to the contact treatment and the equally distributed blank holding force should be inevitably imposed on sheet metal along the periphery regardless of the contact status. But sheet metal does not contact with the blank holder at the periphery, nor the blank holding force is distributed uniformly along the boundary. To impose the blank holding force properly, the scheme is improved so that the blank holding force at each node imposed on sheet metal is dependent on the calculated thickness derivation and a state of equilibrium with the total blank holding force. The validity of the improved scheme is demonstrated with the simulation of cylindrical and rectangular cup deep drawing.

• 반도체디스플레이기술학회지
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• 제18권3호
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• pp.12-18
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• 2019

The protective double layer polymer coatings on silica optical fibers are realized by wet-on-wet liquid coating process and they play an important role in final quality of mass produced optical fibers. This numerical study aims to analyze the effects of secondary coating die design parameters by employing two dimensional axisymmetric model of coating cup and coating die geometry and computational fluid dynamics simulations which include temperature dependent viscosity of polymer coating liquids and viscous dissipation heating. Under high speed fiber drawing conditions and pressurized coating liquid supply, the effects of converging die angle are investigated in order to appreciate the change of coating liquid flow patterns such as flow recirculation zone near coating die as well as primary and secondary coating layer thicknesses. The auxiliary coating die to converging coating die is also tested and the results find that this concept is advantageous in achieving stable double layer coatings on silica glass fiber.

• 반도체디스플레이기술학회지
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• 제17권4호
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• pp.80-85
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• 2018

The present investigation on optical fiber mass manufacturing features the computational modeling and simulation on a double layer liquid coating process on glass fiber surface. The computational model employs a simplified geometry of typical fiber coating system which consists of primary and secondary coating dies along with secondary coating cup. The viscous dissipation in coating flow is incorporated into the double layer coating process simulations. Heavy temperature dependence of coating liquid viscosity is also considered in the model. The computational results found that the effects of viscous dissipation on both primary and secondary coating layer thicknesses are highly significant at higher drawing speed. Several important coating process parameters such as supply temperature and pressure of primary and secondary coating liquids are investigated and discussed in order to appreciate how those parameters affect the double layer coating layer thickness on fast moving glass fiber.

• 한국조경학회지
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• 제36권2호
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• pp.42-52
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• 2008

본 연구는 도시공원의 수목식재 개선을 위한 기초연구로 서울 월드컵공원 평화의공원 지구의 식재기능을 구분하고 기능별 식재특성을 연구하였다. 우선 식재기능에 관한 이론적 고찰을 토대로 도시공원내 적용 가능한 식재기능을 도출하였고, 대상지 설계의도와 환경요인 분석을 거쳐 이를 적용하였다. 식재특성 분석은 우점 식재종 분포와 층위 구성을 전체 도면화한 후 식재기능별 표본 조사구를 설정하여 배식구조를 분석하였다. 대상지 식재기능은 경관식재의 정형식재, 자연경관식재와 완충식재의 방음식재, 차폐식재, 녹음식재의 녹음식재, 지피식재로 구분되었다. 우점식재종은 소나무, 느티나무가 넓게 식재되었고, 식재기능별로는 자연경관식재지내 소나무 이외 다양한 수종이 도입되어 있었다. 이는 공원조성이전 식재된 기념식수목으로 과도한 종의 다양성과 수종간 부조화로 의도한 자연경관 형성에 부적합하였다. 방음식재지는 지형 조정과 키 큰수목을 배식하였으나 전체적으로 하층의 보완이 필요하였다.

• 한국산학기술학회논문지
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• 제19권8호
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• pp.25-31
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• 2018

본 연구에서는 카울 모듈의 성형 시 최적 설계 공정을 유한요소해석을 통해 도출하는 방안을 제시하였다. 소재 인장시험 및 성형성 평가와 같은 기계적 물성 평가를 통해 성형 해석의 주름 및 크랙 발생을 사전에 파악하고 이를 개선하기 위한 공정 설계 변경을 통해 최적 설계 방안을 도출하였다. 또한 제진성 향상이 필요한 카울 로워 패널에 패치워크를 적용을 통해 카울 모듈의 강성 증대 및 제진 특성 향상을 고유진동수 측정 시험과 해석을 통해 확인하였다. 해석 결과, 실러 패치워크 기술 적용에 따른 1차 고유진동수가 향상됨을 알 수 있었고, 이는 강성 및 제진특성 증대와 관련있다고 볼 수 있다. 실러 패치워크 적용 시 공정수 감소를 위해 성형 전 로워 패널 블랭크에 패치워크 블랭크를 점용접으로 접합시켜 성형하므로, 성형 후 패치워크 패널의 위치가 점용접 조건에 따라 달라진다. 이를 위해 점용접 위치에 따른 성형 해석을 실시하여 결과를 바탕으로 최적 공정 설계를 도출하였다. 스탬핑 공법을 이용한 타부품의 적용을 위해 성형 해석 기법을 구축하여 다양한 제품 설계에 도움이 될 것으로 판단된다.

• 인간식물환경학회지
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• 제22권2호
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• pp.145-157
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• 2019

This study was conducted to examine the effects of horticultural therapy on depression and emotional balance of women with hearing impairment. Ten women with hearing impairment registered in the Mokpo branch of the Korean Association of the Hearing Impaired were selected, and participated in the horticultural therapy program composed of 14 sessions from May 15 to July 31. The horticultural therapy program consisted of 'planting tropical orchids,' 'making a dish garden,' 'making plum pickles,' 'decorating a table with flowers,' 'making a hanging pot with succulent plants,' 'making pressed flowers with hydrangea,' 'making a fan with pressed flowers,' 'making a terrarium,' 'making a flower basket,' 'making a mosquito repellent spray,' 'decorating a heart-shaped cup with flowers,' 'making a natural herbal soap,' 'making a hydrangea bouquet' and 'making watermelon salad.' The depression and emotional balance scales were used to examine the effects of the program and the pre- and post-program scores were compared. The mean value of depression statistically significantly decreased from 49.0 points before the program to 43.9 points after the program. In addition, the mean value of emotional balance statistically significantly increased from 0.3 points before the program to 2.3 points after the program. The activity of drawing a picture after each session was effective in reducing depression and improving positive emotional balance by expressing emotions through pictures. The programs preferred by women with hearing impairment included 'making plum pickles,' 'making pressed flowers with hydrangea,' 'planting tropical orchids,' 'making a mosquito repellent spray,' 'making a natural herbal soap,' and 'making watermelon salad.' In conclusion, horticultural therapy programs were effective in reducing depression and improving emotional balance of women with hearing impairment.

• 대한물리의학회지
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• 제19권2호
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• pp.91-98
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• 2024

PURPOSE: This study aimed to provide basic clinical data by investigating the impact of Activities of daily living-related dual-task intervention on lung function, balance, and Activities of daily living of stroke patients. METHODS: After sampling 40 stroke patients who met the selection criteria, this study randomly assigned 20 patients who received dual-task exercise intervention to the experimental group and 20 patients who received single exercise intervention to the control group by drawing lots. Next, the study pre-tested their lung function, balance, and activity of daily living. All interventions were conducted for 30 minutes, 3 times a week for 4 weeks, and when all interventions were completed after 4 weeks, lung function, balance, and activity of daily living were re-measured in the same way as the pre-test. RESULTS: In comparing changes in lung function, balance, and activity of daily living within each of the experimental and control groups, statistically significant improvement were found in the experimental group only (p < .01). Statistically significant improvement were also found in lung function, balance, and activities of daily living between the groups (p < .05) (p < .01). CONCLUSION: A statistically significant improvements were found in lung function, balance, and activities of daily living only in the experimental group and statistically significant differences were found between groups. Because they take arm exercises by maintaining balance in a standing position on a labile surface and through dual-task exercise such as folding a towel, moving a cup, and throwing and catching a ball, muscles related to lung function were stimulated and lung function and balance were improved. This helped activities of daily living to be improved. Thus, it is considered that dual-task exercise should be utilized for stroke patients' smooth everyday life.

• 한국재난정보학회 논문집
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• 제8권2호
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• pp.158-170
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• 2012

본 연구에서는 오늘날 급변하는 사회 정서에 맞추어 사람들의 삶의 질 역시 향상되어 많은 사람들이 다양한 문화 향유의 욕구충족을 위해서 공연 및 행사장을 많이 찾는 현실적 추세에 따라 인명 피해 역시 발생하였으며 또한 피해가 우려되는 상황이다. 따라서 이에 대해 실태분석 및 대책을 마련 해보았다. 공연주최사 및 민간경비의 실태는 실무경험을 바탕으로 사실적으로 분석 파악하고 문제점을 진단하였으며, 공연장 안전관리를 위한 양측의 역할을 모색하고 관련기관과의 협력체계의 향상을 시키고자 함에 중점을 두었다. 따라서 실질적인 관람객의 안전보장을 고려하여 공연시작부터 끝나는 시점까지 안전을 위한 효과적인 대책 마련에 대한 각자의 역할을 모색하고 살펴보게 된다.