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420J2마르텐사이트 스테인레스강의 최종경도에 미치는 열처리조건의 영향
김기돈,성장현 ( K . D . Kim,J . H . Sung ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.3
The effect of batch annealing conditions and austenitizing temperatures on the hardness and microstructural factors were examined by using 420J2 martensitic stainless steel. In spite of the similler hardness after batch annealing, the difference in hardness at the same austenitizing temperature was caused by changes in dissolved carbon during batch annealing. The highest hardness of the specimen was obtained at the batch annealing temperature of 820℃ and austenitizing temperature of 1050℃. The main factor affecting the final hardness of the cold annealed 420J2 specimen was proved to the austenitizing temperature rather than batch annealing temperature.
Synthesis of Cu<sub>2</sub>ZnSnS<sub>4</sub> Nanocrystals by using method of hot injection
김기돈,인수일 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Cu<sub>2</sub>ZnSnS<sub>4</sub> (CZTS) was studied as a material which can absorb visible light. CZTS is a p-type semiconductor with a band gap energy of 1.5 eV, which is suitable for solar energy conversion. This material consists of low toxic and abundant elements. It also is functions efficiently in the polycrystalline state. Recently in order to solve the CO<sub>2</sub> emission, CZTS was successfully achieved by using thin film of CZTS with a metalcomplex electrocatalyst. In this work, an attempt was done to synthesize CZTS by using hot injection, because the method is inexpensive. The synthesized CZTS was confirmed by numerous characterization techniques such as XRD, TEM, and UV Vis spectroscopy. The material also was measured for confirming production of methane using gas chromatography.
밀리미터파 대역 NRD Stepped-Impedance 듀플렉서
김기돈,이재곤,이정해 한국전자파학회 2003 한국전자파학회논문지 Vol.14 No.12
본 논문에서는 밀리미터파 대역에서 NRD guide를 이용한 듀플렉서를 설계하였다. 설계된 듀플렉서는 두개의 stepped-impedance 필터와 한 개의 T-Junction으로 구성되어 있다. 차단영역 도파관 등가회로를 이용하여 stepped-impedance 필터를 설계하였고, T-Junction은 반사손실을 -20 dB 이하로 최적화하였다. 듀플렉서를 제작하여 측정한 결과 응답특성이 시뮬레이션 결과와 일치함을 확인하였다. In this paper, we have designed the duplexer using non-radiative dielectric(NRD) guide in millimeter wave band. The designed duplexer is composed of two stepped-impedance filters and T-junction. Stepped-impedance filters we designed with an equivalent circuit model of evanescent waveguide and the T-junction is optimized to minimize return loss of -20 dB or more. The characteristics of duplexer show good agreements with the expected results.