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수직 이착륙 무인기용 소형 덕티드팬의 공력성능 및 후류특성에 관한 실험적 연구
신수희(Soo-Hee Shin),이승훈(Seung-Hun Lee),김양원(Yang-Won Kim),조태환(Tae-Hwan Cho) 한국항공우주학회 2022 韓國航空宇宙學會誌 Vol.50 No.1
소형무인기의 틸팅방식 추진장치로 소형덕티드팬을 적용하였을 때 나타나는 공력특성을 분석하기 위해 직경 104mm 전기추진 덕티드팬의 공력특성을 풍동시험을 통해 살펴보았다. 소형무인기 운영조건에서 나타나는 현상을 살펴보기 위해 OPPAV 축소시제기의 제자리비행, 전진비행 및 천이비행 조건을 시험조건으로 채택하였으며, 6분력 발란스를 사용하여 덕티드팬의 추력 및 측력, 토크를 측정하였다. 비행체 주날개 및 꼬리날개에 영향을 미칠 수 있는 팬 후류를 파악하기 위해 5공 프로브를 사용하여 덕트 후방 250mm 단면의 3차원 속도벡터를 측정하였다. 제자리비행 및 전진비행 조건에서 덕티드팬의 추력 및 토크 특성을 파악하였으며, OPPAV 축소시제기에 적용하기 위한 조건을 도출하였다. 천이비행 조건에서 틸트각 40˚ 이하에서는 각도가 변하여도 추력이 유지되는 특성을 보이고 있으며 그 이후 각에서는 점차 증가하는 경향이 나타났다. 측력은 틸트각 75˚까지 지속적으로 증가하는 경향이 나타났다. 제자리비행 및 전진비행 조건에서 60m/s 수준의 축방향 속도성분과 12m/s 수준의 원주방향 속도성분이 측정되었다. 틸트각이 증가함에 따라 축방향 속도 최대값 위치가 회전중심선을 벗어나는 경향이 나타나고 있으며, 단면 와류 중심도 유사한 위치로 이동하는 경향이 나타나고 있다. Wind tunnel test for a small scale electric ducted fan with a 104mm diameter was conducted to analyze the aerodynamic characteristics when it was used as a propulsion system of tilt-propeller UAV. Experimental conditions were derived from flight conditions of a sub-scaled OPPAV. Forces and moments of the ducted fan model were measured by a 6-axis balance and 3-dimensional wake vectors which could induce an aerodynamic influence in the vehicle were measured by 5-hole probes. Thrust and torque on hover and cruise conditions were measured and analyzed to drive out the operating conditions when it was applied in the sub-scaled OPPAV. On transition conditions, thrust keep its value with tilt angle variation below 40˚ and increase after that. But, sideforce increase constantly until 75˚. The maximum axial velocity in the wake on hover and cruise conditions was around 60m/s and tangential velocity was around 12m/s. The position of the maximum axial velocity and vortex center move off the fan rotation center line as the tilt angle increases.
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신수희(Soo Hee Shin),양혜경(Hye Kyeong Yang),조영채(Young Chae Cho) 韓國學校保健學會 2007 韓國學校保健學會誌 Vol.20 No.1
Purpose: The present study intended to reveal the association between the physique of adolescent women and dysmenorrhea, and the factors related to the frequency of dysmenorrhea. Methods: The study subjects included 511 girls of a women's high school in Daejeon city and they were, during the period of March 1st through April 30th, 2005, given self-administered questionnaires about frequency of menstruation, age, physique, exercise, and such menstruation-related items as age of menarche, menstrual period and days, and amount. Results: As with the frequency of dysmenorrhea, 38.4% experienced it ｢always｣, 44.6% ｢occasionally｣, and 17.0% ｢almost scarcely｣, and those with dysmenorrhea accounted for 83.0% of the subjects. The frequency of dysmenorrhea was not significant difference according to the BMI and HPI. However, the lower the age of menarche and the greater the amount of menstrual flow, the more frequent dysmenorrhea. The symptoms of dysmenorrhea included the highest frequency of low back pain(68.5%) and it was followed by abdominal pain(65.9%), sensibility(54.0%), fatigue(51.7%), and nervousness(49.5%). These accompanied symptoms tended to be worse as the frequency of dysmenorrhea increased. The multiple logistic regression analysis revealed that the relative risk of frequency of dysmenorrhea is 2.2 times in age of 14, by a standard age of 15 as menarchial age, 2.2 in 13, and 3.1 in below 12. The menstrual days was 3.0 times in both below 2 days and over 8 days with the standard days of 3-7 days. The menstrual amount was 1.9 times in the group with a greater amount of menstrual bleeding and 1.5 times in the group with a less amount than the normal group, respectively. Conclusion: The above results suggest that the rate of experiencing dysmenorrhea was up to 83.0% and 38.4% from these had dysmenorrhea upon every menstruation. It is thought that dysmenorrhea could be a great disadvantage sufficient to impair optimal health to a larger body of school girls. Further, for quality of life, it is required that more fundamental strategies instead of pain killers or others for palliation of dysmenorrhea would be established among adolescents.
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최수영 ( Soo Young Choi ),이인용 ( In Yong Lee ),손정호 ( Jung Ho Shon ),이용원 ( Yong Won Lee ),신수희 ( Soo Hee Shin ),이득희 ( Deuk Hee Lee ),김평환 ( Pyoung Hwan Kim ),용태순 ( Tai Soon Yong ),홍천수 ( Chein Soo Hong ),박중원 대한천식알레르기학회 2006 천식 및 알레르기 Vol.26 No.4
Background and Objective: Mechanical laundry has a key role for environmental control of allergens. However, the optimal conditions for removing allergens such as house dust mite (HDM), dog dander, and pollens are not yet clear. Method: Four cleaning modes such as 30℃, 40℃, 60℃, and steam (adapt steam and water cleaning) were evaluated. Viability of HDM was assayed with heat escape method and levels of group 1 major allergens of D. farinae (Der f 1) and dog dander (Can f 1) were assayed with 2-site ELISA. Levels of pollen protein were assayed with Bradford method. Result: At 60℃ and steam cleaning modes, all HDM were dead but at 30∼40℃ modes, only 6.4∼9.3% of HDM were dead. The levels of Der f 1 in extraction buffers immediately after 30℃, 40℃, 60℃, and steam cleaning were 26.8%, 2.4%, 1.3%, and 0.6%, respectively. The levels of Can f 1 were 41.5%, 42.7%, 12.6%, 9.8% and the pollen protein levels were 31.8%, 4.9%, 3.9%, and 2.8%, respectively. Conclusion: Steam and 60℃ cleaning is better than 30∼40℃ cleaning for removing indoor and pollen allergens. (Korean J Asthma Allergy Clin Immunol 2006;26:289-296)
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2011-2014 국내 의류학 전문 학술지에 발표된 의류소재 분야의 연구동향
허예지(Heo Ye ji),신수희(Shin Soo hee),최종명(Choi Jong myoung) 충북대학교 생활과학연구소 2017 생활과학연구논총 Vol.21 No.1
This paper was performed to study the trends of textile research, published in Korean journals of clothing & textiles in 2011-2014. There are five kinds of journals in this research: Journal of the Korean Society of Clothing and Textile; Fashion & Textile Research Journal; Journal of the Korean Society of Costume; The Research Journal of the Costume Culture; and Journal of the Korean Fashion & Costume Design Association. Analysis was utilized exclusively on the articles of textile in these journals, classifying according to research methods, research contents, and number of researcher. Among these articles published during those periods, the number of textile articles was 202, and totalled to 11.5%. The ratio of textile articles differed according to each journal, but there was no difference between the number of articles and published year. The research contents of the textile articles varies in fabric properties/finishing, dyeing, fabric pattern, and they differed according to the journals. And more than half of the research methods of textile articles were executed using experimental research, most of the articles about fabric properties/finishing and dyeing chose experimental research as their research methods. The number of researchers who conducted the study of apparel materials differed according to the research methods. The experimental research and survey were facilitated by two or three researchers. Moreover, most review articles were facilitated by one researcher.
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