딤플 패턴이 있는 실리콘 표면의 마찰특성

유신성(Shin Sung Yoo),허윤영(Yoon-Young Heo),김대은(Dae-Eun Kim) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.5

자전거 출퇴근자의 의복 선택에 영향을 미치는 요소 및 요구사항 조사연구

유신정(Yoo, Shin Jung),이명주(Lee, Myung Joo),이희림(Lee, Hee Rim) 한국디자인문화학회 2015 한국디자인문화학회지 Vol.21 No.4

자전거 이용이 저탄소 정책의 성공과 연결되기 위해서는 운동으로서의 수단이 아니라 출퇴근시 자가용 이용을 대체할 수 있어야 한다. 따라서 본 연구에서는 자전거 출퇴근 자들이 느끼는 환경 중 의복적 측면에서의 불편함과 요구, 선호 등을 조사하여 자전거 출퇴근 전용 전문 스마트웨어 개발을 위한 기초적인 자료를 제공하고자 수행되었다. 자전거로 출퇴근 하는 남성 110명을 대상으로 온, 오프라인 설문을 통해 자료가 수집되었으며 자전거 출퇴근에 따른 환경과 의복관련 전반적인 문제점과 선호요인이 조사분석되었다. 연구 결과 가장 영향을 미치는 요소는 눈과 비, 바람과 같은 외부 환경요소였으며 출퇴근 후 샤워문제와 같은 부대시설의 미비도 문제점으로 느끼고 있는 것으로 조사되었다. 자전거 출퇴근 용 의복 선택 시 중요시 하는 요소는 디자인보다 기능성과 가격으로 나타났다. 현재는 자전거 출퇴근시 전문사이클용 자전거 복을 주로 착용하고 있으나 화려하고 지나치게 눈에 띄는 색상이나 무늬, 몸에 밀착되는 소재와 디자인 등에 불만을 가지고 있었고 선호하는 기능으로는 주행 중 땀처리, 외부환경으로부터의 보호, 휴대와 세탁의 용이함 등이 포함되었다. 출근 후 젖은 옷의 처리 문제도 해결 받기 원하는 큰 문제점으로 조사되었으며 스마트 웨어가 개발된다면 가장 기대하는 성능은 가변적인 체온조절 기능, 유해환경으로부터의 보호인 것으로 조사되어, 자동차와 같이 보호되지 않는 환경에서의 출퇴근을 위한 자전거 타기에서 가장 기대하는 성능은 다변하는 날씨로 부터의 보호와 쾌적성(protection and comfort)이라는 것을 알 수 있었다. For the sake of low-carbon policy, bicycle should be used as a transport for commuting. The purpose of this study was to figure out difficulties, demands, and preference of bike commuters in terms of environment and clothing in order to provide fundamental data for developing smart clothing for bike commuters. 110 bike commuters were participated via on/off line survey. Results showed that the most influencing factors for bike commuting were environmental situation, such as rain or snow. Difficulty of taking shower after riding was one of the main problems. Important considering factors when purchasing cycling clothing were function and price rather than design. Most of respondents were wearing cycling wear for bike commuting but dissatisfied with loud color/pattern and skintight design/fabric. Preferred functions were sweat management during riding, protection against dangerous environment, and easy to carry/maintenance. Management of wet clothing after riding was one of the biggest problems, especially in summer. As for the expecting performances of smart clothing for bike commuters, versatile control of body temperature and keepping riders comfortable from various situations during riding. Overall, protection and comfort against adverse environment such as changeable weather and harsh conditions (protection and comfort) were the main demands for the smart clothing for the bike commuters.

Friction Reduction Properties of Evaporation Coated Petroleum and Silicone Oil Lubricants

Shin Sung Yoo(유신성),Dae Eun Kim(김대은) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.8

진동을 이용한 세라믹 재료의 마찰 저감 효과에 대한 연구

유신성(Shin-Sung Yoo),허윤영(Yoon-Young Heo),김대은(Dae-Eun Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11

마이크로 마모 시험기 개발을 위한 설계 방안 및 구조 해석

유신성 ( Shin Sung Yoo ),김대은 ( Dae Eun Kim ) 정보저장시스템학회 2012 정보저장시스템학회논문집 Vol.8 No.1

소아 백일해 감염의 유행 및 임상 양상(2000. 3-2001. 3)

유신,안경옥,박은혜,조현상,박종영,이혜란,Yoo, Shin,Ahn, Kyong Ouk,Park, Eun Hye,Cho, Hyun Sang,Park, Chong Young,Lee, Hae Ran 대한소아청소년과학회 2002 Clinical and Experimental Pediatrics (CEP) Vol.45 No.5

목 적 : 최근 연간 10여건으로 감소추세로 보고되고 있는 백일해의 유행실태와 임상양상을 분석함으로써 백일해에 대한 역학적 자료와 임상적 진단의 지침 마련에 도움이 되고자 본 연구를 시행하였다. 방 법 : 2000년 3월부터 2001년 3월까지 본원에 입원한 환아 중 1주일 이상의 심한 백일해양 기침 증상을 보인 환아 49명을 대상으로 비인두 가검물을 채취하여 PCR과 배양검사를 실시하였다. 결 과 : 49명의 검사 의뢰 환아 중 10명이 PCR 양성이었고 이중 4명이 배양검사 양성이었다. 이환 환아는 모두 봄철인 3-5월과 가을철인 9-11월에 발생하였고, 나이별로는 10명 모두 6개월 미만이였고 이중 8명이 DTaP 미접종 환아이었다. 결 론 : 본 연구에서 백일해로 진단된 환아들은 대부분 지역의원에서 질병 초기에 세기관지염, 폐렴 및 기관지염으로 진단되어 치료를 받다가 전원 되었다. 그러므로 특히 DTaP 접종을 받지 않은 영아에서 특징적인 '흡' 소리가 없더라도 심한 기침이 있는 경우 관심을 가지고 백일해 진단을 위한 검사를 시행한다면 보다 많은 수의 백일해 환자가 진단될 가능성이 있다고 사료된다. Purpose : Pertussis is a highly communicable infectious disease in children with high mortality, especially in young infants. The incidence of pertussis in South Korea has decreased to about 10 cases a year in late '90s. Doubting previously reported incidences of pertussis, we designed this study to establish exact epidemiology and a diagnostic basis of pertussis. Methods : From Mar. 2000 to Mar. 2001, polymerase chain reaction(PCR) and cultures of nasopharyngeal aspirates were taken from 49 patients who were clinically suspected of pertussis in Kangdong Sacred Heart Hospital. Results : Among 49 patients suspected of pertussis, 10 cases showed positive results by PCR method. Four out of those 10 cases were positive in culture. The peak outbreak was noticed in the spring(Mar.-May) and the autumn(Sep.-Nov.). The mean age of the patients was 3.6 months. Eight of the 10 cases which were PCR positive results proved not to be immunized against pertussis. Conclusion : Most of the pertussis patients in our study were diagnosed as bronchiolitis, pneumonia or bronchitis at the beginning of the disease and only a few patients showed typical clinical manifestations of pertussis, including whooping. When the above results are taken together, we suggest the possibility that the actual prevalence of pertussis in South Korea might be higher than that of previous reports. The importance of pertussis screen tests should be emphasized in children with severe coughs.

수종의 알레르기 관련 약물이 흰쥐의 복강내 비만세포에서 Hyaluronidase 및 히스타민 유리에 미치는 영향

유신애,김구자,하종식,Yoo, Shin-Ae,Kim, Ku-Ja,Hah, Jong-Sik 대한생리학회 1988 대한생리학회지 Vol.22 No.2

Type I allergic reaction and it's related clinical manifestations are known to occur by the effects of various chemical mediators. These chemical mediators are released from circulating basophils and tissue mast cells, which become 'sensitized' through the binding of antigens and antibodies of the IgE type to their cell surface receptors. Efforts to elucidate the mechanism of the release of these mediators, especially that of histamine, have been persued for years. The mechanism is not yet clarified at the present time. Recent reports of hyaluronidase, an enzyme known to be involved in the tissue inflammatory process, as possible participant in type I allergic reaction, initiated this study. Relationships between the hyaluronidase activity and histamine release from the sensitized rat peritoneal mast cells were investigated. Also anti-allergic agents, tranilast and disodium cromoglycate, along with known histamine releasers, morphine and compound 48/80, were used to observe the inhibitory and stimulatory effects of these substances on the hyaluronidase activity as well as histamine release from the rat mast cells. The results obtained are summarized as follows: 1) Hyaluronidase activity and histamine release from sensitiaed rat peritoneal mast cells started to increase on the 4th day of postsensitization. Hyaluronidase activity reached it's peak value on the 7th day of postsensitization and that of histamine release on the 14th day of postsensitization. 2) Hyaluronidase activity and histamine release from sensitized rat peritoneal mast cells, pre-treated with tranilast revealed significant decrease in comparison with those of non-treated cells. 3) Hyaluronidase activity and histamine release from sensitized rat peritoneal mast cells, pre-treated with tranilast, followed by morphine injection, revealed significant increase in comparison with those of tranilast treated cells. 4) In vitro study of hyaluronidase activity and histamine release from un-sensitized rat peritoneal mast cells, using morphine and compound 48/80 as activators, revealed significant increase compared to those of non-activator used cells. 5) In vitro study of hyaluronidase activity and histamine release from un-sensitized rat peritoneal mast cells, pre-treated with tranilast and disodium cromoglycate, using confound 48/80 and morphine as activators revealed significant decrease in comparison with those of tranilast and disodium cromoglycate treated cells. From above results, participation of enzyme hyaluronidase in the process of histamine release from sensitized rat pertioneal mast cells, could be suggested. It was also quite evident that the clinically used anti-allergic agents, tranilast and disodium cromoglycate, have significant inhibitory function on the hyaluronidase activity and histamine release from sensitized rat peritoneal mast cells, while morphine significantly increased the hyaluronidase activity and histamine release from sensitized rat peritoneal mast cells.

동방결절에서 과분극에 의해 활성화되는 내향전류에 대한 Cyclic-GMP의 영향

유신,호원경,엄융의,Yoo, Shin,Ho, Won-Kyung,Earm, Yung-E 대한약리학회 1997 The Korean Journal of Physiology & Pharmacology Vol.1 No.6

The aim of present study is to investigate the effects of cGMP on hyperpolarization activated inward current ($I_f$), pacemaker current of the heart, in rabbit sino-atrial node cells using the whole-cell patch clamp technique. When sodium nitroprusside (SNP, $80{\mu}M$), which is known to activate guanylyl cyclase, was added, $I_f$ amplitude was increased and its activation was accelerated. However, when $I_f$ was prestimulated by isopreterenol (ISO, $1{\mu}M$), SNP reversed the effect of ISO. In the absence of ISO, SNP shifted activation curve rightward. On the contrary in the presence of ISO, SNP shifted activation curve in opposite direction. $8Br-cGMP(100\;{\mu}M)$, more potent PKG activator and worse PDE activator than cGMP, also increased basal $I_f$ but did not reverse stimulatory effect of ISO. It was probable that PKG activation seemed to be involved in SNP-induced basal $I_f$ increase. The fact that SNP inhibited ISO-stimulated $I_f$ suggested cGMP antagonize cAMP action via the activation of PDE. This possibility was supported by experiment using 3-isobutyl-1-methylxanthine (IBMX), non-specific PDE inhibitor. SNP did not affect $I_f$ when $I_f$ was stimulated by $20{\mu}M$ IBMX. Therefore, cGMP reversed the stimulatory effect of cAMP via cAMP breakdown by activating cGMP-stimulated PDE. These results suggest that PKG and PDE are involved in the modulation of $I_f$ by cGMP: PKG may facilitate $I_f$ and cGMP-stimulated PDE can counteract the stimulatory action of cAMP.

한반도 중부권 지각물질의 구조와 물성연구: 콘크리트 공시체에 의한 표준시험 규정에 대하여

정지곤 ( Ji Gon Jeong ),유신애 ( Shin Ae Yoo ) 대한지질공학회 1995 지질공학 Vol.5 No.2

2008년~2013년 전문 등산잡지에 나타난 기능성 등산복 광고 분석

유흔(Xin Liu),유신정(Shin Jung Yoo) 한국디자인문화학회 2014 한국디자인문화학회지 Vol.20 No.3

본 연구에서는 2008년~2013년까지 6년간 국내 기능성 아웃도어 전문잡지에 나타난 기능성 등산복 광고680개를 대상으로 소구유형과 제품의 성능정보제공유무, 모델의 유형에 따라 분석하여 기능성 등산복 광고의 년도별 특성과 년도에 따른 변화 양상을 살펴보았다. 연구 결과 2008년도에는 기능성 의류제품의 특징을 반영하는 광고의 성격을 띄어, 성능정보를 주요한내용으로 제공하며 비유명인 모델을 사용하는 광고가주로 이루어졌으나 2013년에는 73.53%의 등산복 광고가 성능정보를 제공하지 않았으며 감성소구가 이성소구보다 3배 정도 많이 사용된 것으로 조사되었다. 또한 유명인 모델을 사용하는 비율도 2008년 1.48%에서2013년에는 35.30%로 급격히 증가하여 기능성 의류제품의 광고가 패션의류의 광고와 유사하게 변화되고있음을 확인할 수 있었다. 연구의 결과는 현재까지 이루어진 바 없는 기능성의류 광고의 분석과 방향 수립을 위한 기초자료로 사용될 수 있을 것이다. This study aimed to figure out current situationand changing trends of advertisement of functionalclimbing wear. From functional outdoorwear magazinesduring 2008~2013, 680 advertisements were analyzed interms of appeal type, type of functional information, andmodel type to investigate characteristics and trends ofannual changes of functional climbing wearadvertisement. The results clearly showed themagazine advertisements of climbing wear have beenchanged like fashion ads. On 2008, functional climbingwear ads had characteristic features such as deliveringfunctional information using unfamous models. On 2013,however, 73.53% of ads did not provide any functionalinformation and emotional appeals used three timesmore than rational appeals. Proportion of famous modelswas dramatically increased from 1.48% (2008) to35.30%(2013). The results will provide practicalinformation for analysis and planning for the ads offunctional clothing.