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蝦燒 Alunite 粉末과 암모늄鹽 緩衝溶液과의 不均一反應
이희철,김철영,이익춘,Hee Chul Lee,Chul Young Kim,Ikchoon Lee 대한화학회 1975 대한화학회지 Vol.19 No.5
Alunite 鑛으로 부터 칼륨과 알루미늄 成分을 完全히 分離하여 내는 方法으로 pH8.0인 緩衝溶液과의 反應에서 反應速度와 反應機構를 究明했다. Calcinated alunite powder (surface area 5100 $cm^2/g$) was found to react with well stirred ammonium buffer solution (pH 8.0) following Jander's equation. The rate constants increase with the amount of solid and temperature of reaction system. The energy of activation for the reactions (at $30{\sim}60^{\circ}C$) was 15.7 kcal/mole. The rate-determining step appears to involve ionization of alunite.
Pyrromethene 597 고체 색소 레이저의 제작 및 출력 특성
이희철,김용평,Lee, Hee-Chul,Kim, Yong-Pyung 한국광학회 2005 한국광학회지 Vol.16 No.2
PMMA에 pyrromethene 597(PM597) 색소를 주입하여 고체 색소를 제작한 후 그 레이저 출력특성을 분석하였다. 펌핑 광원으로 Q-스위치 Nd : YAG 레이저의 제 2 고조파를 사용하여 발진 중심파장 585 nm에서 최대 광 변환효율 $76\%$를 얻었다. 광안정성을 증가시키기 위해 단일항 에너지 상태의 산소 제거제인 DABCO(1,4-diazabicyclo [2,2,2]octane)를 주입하여 반복율 4 Hz, 출력에너지 250 mJ, 100,000번 이상의 펄스 출력을 얻었다. We fabricated pyrromethene 597(PM597) solid-state dyes which were dissolved in PMMA(poly- methylmethacrylate) and characterized the lasing characteristics. The laser was end-pumped by a frequency doubled Q-switched Nd : YAG laser. We obtained the slope efficiency of $76\%$ at lasing wavelength of 585 nm. We demonstrated the laser lifetime to be more than 100,000 shots with output energy of 250 mJ and repetition rate of 4 Hz by adding singlet oxygen quencher DABCO(1,4-diazabicyclo [2,2,2]octane) to the solid-state dye.
GRM(Gaussian Reflectivity Mirror)을 이용한 불안정 공진기형 Q-스위치 Nd:YAG 레이저의 출력특성
이희철,김용평,Lee, Hee-Chul,Kim, Yong-Pyung 한국광학회 2005 한국광학회지 Vol.16 No.2
출력거울로 GRM(Gaussian reflectivity mirror)을 채택한 불안정 공진기를 구성하여 그 Q-스위치 출력의 특성을 분석하였다. 입력 전기에너지가 55J 일 때 1064 nm의 기본파장에서 470 mJ, 532 nm의 제2고조파 파장에서 280 mJ의 출력 에너지를 얻었다. 출력빔의 발산각은 1.7 mrad 이었으며 근접장 영역에서 Top-Hat 형태의 빔을 얻을 수 있었다. We investigated the operational characteristics of a Q-switched Nd:YAG laser, which has an unstable resonator with a GRM(Gaussian reflectivity mirror). With electrical input energy of 55 J, we obtained the fundamental energy of 470 mJ at 1064 nm and the frequency doubled energy of 280 mJ at 532 nm. The Top-Hat profile of the output beam was obtained at the near field, and beam divergence was 1.7 mard.
언더컷 처리장치 없는 사출성형을 위한 강제취출에 관한 연구
이희철,이희진,김경호,황재영,김영식,류호연,Lee, Hui-Chul,Lee, Hee-Jin,Kim, Kyung-Ho,Hwang, Jae-Young,Kim, Young-Sik,Ryu, Ho-Yeun 한국금형공학회 2015 한국금형공학회지 Vol.9 No.1
Recently, the mold industry has been developed to high-quality and high-productivity with various demands of the high-tech industry. Also, geometry parts of injection mold are complex and diverse optimum design through the injection molding analysis has become a matter of course. The mold industry is trying to revitalize the industry with demand technology development and manufacturing process improvement. However, products that have undercut is the need for a separate processing mechanism and structure of the mold is getting more complex, the cost is expensive. Therefore, improving the structure of the mold through a study on the forced ejecting for injection molding without undercut processing unit and to improve the productivity.
이종제품 동시성형을 위한 세미스택 몰드의 균형충전에 관한 연구
이희철,이희진,김경호,황재영,김영식,류호연,Lee, Hui-Chul,Lee, Hee-Jin,Kim, Kyung-Ho,Hwang, Jae-Young,Kim, Young-Sik,Ryu, Ho-Yeun 한국금형공학회 2014 한국금형공학회지 Vol.8 No.2
Recently, semi-stack mold have been developed for satisfying the various elements required in the mold industry. The mold is possible using with general-purpose injection molding machine by weight reduction through the improvement of the mold structure. In order to do that, tension core, spiral cooling system and half runner system were applied. It is effective for increased productivity and decreased of loss to the materials. However, the mold is required the filling balance in order to improve the quality and efficiency. Thus this study performed that optimum design and analysis of semi-stack mold for filling balance.