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나선형 홈을 가진 브레이크 유로 내에서의 국소 열전달 측정 및 열 유동 해석
임창율(Changyul Lim),박성봉(Sungbong Park),이대희(Daehee Lee),김흥섭(Hengseob Kim),이관수(Kwansoo Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
A ventilated disk brake having spirally fluted fins has been proposed to improve the thermal judder by way of heat transfer enhancement. The local heat transfer coefficients were measured in the flow passage of disk brake. These measured local heat transfer data were utilized to do the finite element numerical analysis which predicts the maximum temperatures on the disk brake. The results show that the maximum temperatures on the disk surface with spirally fluted fins are approximately 26.6% lower than those without them.
The Evolution of Korea's Basic Acts on Science and Technology and their Characteristics
Lee, Changyul,Lee, Elly Hyanghee,Kim, Seongsoo Asian Society for Innovation and Policy 2021 Asian Journal of Innovation and Policy Vol.10 No.3
This study examined the evolution of S&T Basic Acts in Korea from the Science and Technology Promotion Act (1967) through the Special Act on STI (1997) to the Framework Act on Science and Technology (2001) in the following aspects: 1) comprehensive plans, 2) coordination mechanisms for S&T policies, 3) enforcement of R&D programs and performance diffusion, 4) promotion of human resources, 5) and S&T investment and budgeting. Before the Framework Act on S&T was enacted in 2001, critical issues were found in establishing S&T master plans, promotion of R&D programs, comprehensive coordination mechanisms, and R&D budgeting. The three Basic Acts have expanded the scope of regulation over time to cover the entire cycle of the S&T process. They concern a wide range of issues, including creating a basis for scientific and technological development, S&T promotion, disseminating and commercializing research outcomes, and preventing adverse effects from science and technology. The content of the Basic Acts has evolved in response to changes in the political, economic, and social environment of Korean industry during the past five decades.
면역독성평가 대체시험법 개발을 위한 참조 시험물질 선정 방안
김창열 ( Changyul Kim ),허용 ( Yong Heo ) 한국동물실험대체법학회 2021 동물실험대체법학회지 Vol.15 No.1
Alternative test method for screening immunotoxic substances has not been actively challenged and no test guideline has been officialized internationally. Preparation of master list on reference chemicals is a critical process for decision on positive or negative immunotoxicity of test substances through alternative test method. The reference master list is recommended to include various scopes of immuntoxic xenobiotics including medicinal products, cosmetic ingredients, and industrial or environmental agents. Data bases or research results on human or animal immunotoxicity of chemicals were collected and analyzed for preparing the list of reference chemicals. Twenty eight chemicals were selected as non-immunotoxicants, which could be used as negative controls for immunotoxicity and 10 immunosuppressive drugs were chosen for classifying immunosuppressive toxicity of test substances. Considering chemicals used as positive controls for immunotoxicity, 38 substances with aberrant immune regulatory capacity were listed, which are categorized into 23 industrial or environmental agents, 12 medicinal products, and 3 agrochemicals. The list of reference test substances could contribute to development of in vitro alternative assay method for immunotoxicity evaluation.
천창율,정진교 江原大學校 産業技術硏究所 1993 産業技術硏究 Vol.13 No.-
This paper presents an analysis of microwave device component. An H-Plane waveguide component with arbitrary shape is analyzed using finite element method (FEM) cooperated with boundary element method(BEM). The finite element method (FEM) is applied to the junction region and the boundary element method(BEM) to the waveguide region. For the application of BEM in the waveguide structure, a ray representation of the waveguide Green's function is used. The proposed technique was applied to the analysis of the waveguide inductive junction to compare the numerical result with the result of the mode matching technique. The comparison showed good agreements between the two results. Transmitted powers were also computed in T-junction waveguides for the various shape of the junction area.
Byambaakhuu Batnairamdal,Changyul Cheon,Kwan-Jin Oh 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.4
본 논문에서 무선 양이 보청기 시스템을 위한 소형 안테나를 설계 및 측정하였다. 제안된 안테나는 CPW 형태로 급전하였으며 ┌ 자형과 테이퍼드 슬롯으로 구조, 고유전율 세라믹 기판(ε=10)을 이용하여 안테나 크기를 소형화 시켰다. 제작된 안테나는 비유전율 10인 Taconic 사의 두께 0.635 ㎜인 기판을 사용하였으며, 안테나 크기는 3.68 ㎜ × 4.28 ㎜ 로 매우 작다. 설계주파수는 8.4 GHz 이며, 제작된 안테나 실험 결과 7.9 ~ 9.5 GHz 까지 -10 dB 이하에 반사 손실을 보였다. 또한 인체 귀 주변에 위치별로 S21 측정 실험을 진행하여 측정된 값을 비교함으로써 제안된 안테나의 통신 성능이 가장 좋은 위치를 살펴보았다. 실험결과 귀 뒤 위치에서 S21 값이 가장 잘 나타나는 것을 (위치 3에서 S21=-52.6 dB, 위치 5에서 S21=-53 dB) 확인하였다.