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이봉구(Lee, Bong-Goo),오성모(Oh Seong-Mo) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.4
우리는 자동차 엔진을 지지하기 위한 고무에 대한 마찰특성을 연구하였다. 본 논문은 실험실에서 개발된 테 스트 장비를 사용하여 여러 고무의 마찰 마모 특성을 실험적 연구에 의해 분석하였다. 마찰특성은 하중과 온도, 속 도 등과 같은 여러 가지 조건 하에서의 마찰력과 수직하중으로부터 측정되었다. 따라서 자동차는 물론 각종 구조용 으로 사용되어 지고 있는 고무는 여러 조건에 따라 마찰특성의 관계를 연구하였다. We have studied on the frictional characteristics for mounting rubbers varieties structures on the automotive engine. This paper are using a test apparatus developed in the laboratory, friction and wear characteristics of various rubbers have been analyzed by experimental study. Frictional characteristics has been measured from the normal force and friction force under various operating conditions, such as, loads, speed and temperatures. Therefore, the rubbers are used in a several varieties structures as well as automotive, the relations between the various conditions and frictional characteristics have been investigated.
아토피 피부염 및 두드러기 환자에서 알레르겐 단자시험과 혈중 호산구 및 IgE 검사 성적에 관한 연구
이봉구(Bong Goo Lee),심우영(Woo Young Sim),이무형(Mu Hyoung Lee),허충림(Choong Rim Haw) 대한피부과학회 1989 대한피부과학회지 Vol.27 No.5
Common environmental allergens play an important role in the pathogenesis of atopic dermstitis and urticaria via type I hypersensitivity reaction. The present study was undertaken to observe the prick test reactivity to common environmental allergens and peripheral blood eosinophil and total serum IgE levels in 20 patients of atopic dermatitis, 26 patients of chronic urticaria and 27 patients of artificial urticaria The results were as follows : 1, The psitive reactivities of allergens in patients with atopic dermatitis, chronie urticaria and artificial urticaria were 75.0%, 84.6% and 66.7%, respectively. 2. The positive reactivities of the inhalant allergens were more common than those of the food allergens, but statistically significant difference was found only in patients with chronic urticaria. 3. The most frequent allergen in prick test reactivity was D. farinae. 4. In patients with atopir, dermatitis, chrcnic urticaria and artificial urticaria, peripheral blood eosinophilias were encountered in 31.3%, 30.4%, and 25.0%, respectively. And statisticnlly significant elevations of eosinqphils in the prick test positive groups were observed in patients with atopic dermatitis. 5. ln patients with atopic dermatitis, chronic urticaria and artificial urticaria, elevati<ons of total serum IgE levels were encountered in 86.7%, 63.6% and 61.5 respectively, but there were no statistically significant differences of serum IgE levels between the prick test positive and negative groups in all disease groups. 6. Statistically significant correlations were observed between eosinophil and IgE levels in all patients group(r=0.352 p<0.01) and chronic urticarial patients (r=0.551, p<0.05).
유한 요소법을 이용한 히트싱크의 성능평가를 위한 열해석 연구
이봉구(Lee, Bong-Goo),이민(Lee, Min) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.9
최근 전자 및 기계부품 기술의 발전으로 전자 장비는 더욱 고성능화, 소형화, 다기능화 되면서 시스템 내부에 발생하 는 발열부의 온도를 제어하기 위해 히트싱크가 사용된다. 본 연구에서는 내부 터널 구조의 2가지 형상의 히트싱크의 열 성능 평가를 유한요소 프로그램인 ANSYS를 이용하여 수치해석 하였다. 수치해석은 자연대류 상태에서의 열 성능을 수치해석으 로 비교 분석하여 냉각핀 형상에 따른 열 성능을 평가하였다. 또한 시간에 따른 열전달 특성과 온도분표의 해석결과를 기초 로 하여 히트싱크의 성능평가를 예측하였다. 수치해석의 결과, 형상 A 히트싱크가 형상 B의 히트싱크보다 열 전달율이 자연 대류에서 약 70% 향상되었다. This study examined the numerical analysis results with respect to the thermal behavior of a natural convection cooled pin-fin heat sink. The heat sink consisted of pin fins integrated with plate fins. The heat sinks were designed with two different types to fit the limited internal space. The two types of heat sinks designed were analyzed using the ANSYS software package, and the numerical analysis results were compared with the cooling performance of the two types of heat sinks. The results of the simulation were analyzed according to the temperature distribution and air flow characteristics, heat flux etc. This study examined the correlation of the cooling performance with the heat sink internal structure and fin shape. FEM (Finite Element Method) confirmed the cooling performance of heat sink type A under natural convection conditions as the best results. The results of the numerical simulation showed that the heat sink type A shape showed an approximately 70 percent better heat transfer rate with natural convection than that of type B.
이봉구(Lee, Bong-Goo),오성모(Oh Seong-Mo) 한국산학기술학회 2008 한국산학기술학회논문지 Vol.9 No.6
본 논문은 실험실에서 개발된 테스트 장치를 사용하여 여러 고무의 마찰 마모 특성을 실험적 연구에 의해 분석하였다. 마찰 계수는 하중과 온도 등과 같은 여러 가지 속도 조건 하에서의 마찰력과 측정된 수직하중으로부터 계산되었다. 자동차에 사용되는 타이어는 여러 가지 작통 상태에 따라 마찰 특성의 관계가 확인되었다. This paper are using a test apparatus developed in the laboratory, friction and wear characteristics of various rubbers have been analyzed by experimental study. Friction coefficient has been calculated from the measured normal force and friction force under various speed operating conditions, such as, loads and temperatures. The tire are used in a automobile, the relations between the various operating conditions and friction characteristics have been verified.
이봉구(Lee, Bong-Goo) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.12
레이저 직접묘화방법을 이용하여 절연기판(SiO₂)위에 미세전도성패턴을 제조하였다. 레이저 유도증착공정은 레이저 빔이 금속박막에 조사되면 레이저 빔의 빛 에너지가 금속박막에 흡수되어 열에너지로 바뀌면서 열전도에 의한 열분해반응으 로 기판위에 증착이 일어난다. 본 논문에서는 금속박막위에 폴리머 코팅을 하여 레이저 직접묘화공정을 적용하여 미세패턴 과 3차원 마이크로 구조물 제조에 관한 연구를 수행하였다. 평균 증착율은 전반적으로 레이저출력이 높을 수록 선형적으로 증가하고, 빔 스캔 속도가 감소할수록 증착율은 증가한다는 것을 확인하였다. Polymer 코팅층을 이용하여 미세전극을 증착 하여 비저항값을 측정하여, 코팅층을 사용한 경우의 전기전도도가 코팅을 하지 않은 경우보다 약 3배정도 향상되는 것을 확인할 수 있었다. A micro-conductive pattern was fabricated on an insulating substrate (SiO₂) surface using a laser direct writing method. In the LIFT process, when the laser beam irradiates a thin metal film, the photon energy is absorbed by the film and converted to thermal energy, and the thermal decomposition reaction produced by the resulting heat conduction forms a deposit on the substrate. The resistivity of the micro-electrodes deposited through LIFT process with and without polymer coating was measured. The results showed that the electric conductivity of the micro-pattern and micro-structure can be increased approximatly two times when the deposited micropattern is fabricated through a LIFT process with a polymer coating, compared to the case without a polymer coating.
Etretinate 경구 투여로 호전을 보인 모공성 홍색 비강진
이봉구(Bong Goo Lee),이무형(Moo Hyung Lee),김낙인(Nack In Kim),허충림(Choong Rim Haw) 대한피부과학회 1987 대한피부과학회지 Vol.25 No.6
We report herein a case of pityriasis rubra pilaris in a 39-year-old male, who had erythematous scaly patches on the face, trunk and extremities for one year. The skin lesion showed well defined plaques on the elbow and knee joint areas, and exfoliative hyperkeratotic sheets with fissures on the palms and soles. He had no family and past history of such skin lesion. He was treated with etretinate lmg/kg/day for 1 week initially, and then tapered off 0.5mg/kg/day for 5 weeks with marked improvement. There was no exacerbation and recurrence of the skin lesion for about 1 year.
양치우(Chee Woo Yang),이봉구(Bong Goo Lee),이무형(Moo Hyung Lee),김낙인(Nack In Kim) 대한피부과학회 1989 대한피부과학회지 Vol.27 No.1
We report a case of tinea incognito occurring in a 47-year-old woman who deveoped erythematous papules and scaly patches on whole body after taking corticosteroid therapy intermittently over a period of 3 months. Direct smear and culture for fungus of the lesions demonstrated hyphae and C. albicans and T. mentagrophytes, which confirms the diagnosis. The lesions disappeared three months after systemic and topical antifungal therapy.
오희수(Hee Soo Oh),이봉구(Bong Goo Lee),김낙인(Nack In Kim),허충림(Choong Rim Haw) 대한피부과학회 1987 대한피부과학회지 Vol.25 No.4
We report a case of 77-year old male with erythema elevatum diutinum, associated with pancytopenia, which developed on the unusual sites. Erythematous or brownish nodules developed on the face, neck, trunk, upper extremities and tongue. Histopathological examination of skin and tongue lesions showed perivascular infiltration of neutrophils, lymphocytes and nuclear dusts, and deposition of fibrinoid material within and around the vessel walls. His skin lesions improved slightly with systemic corticosteroid therapy.