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티타늄 가공에서 절삭력 분석을 위한 ADL 밀링 가공특성
한정식,정종윤,Han, Jeong Sik,Jung, Jong Yun 한국산업경영시스템학회 2022 한국산업경영시스템학회지 Vol.45 No.3
The purpose of using coolant in machining is both to increase a tool life and also to prevent product deformation and thus, stabilize the surface quality by lubricating and cooling the tool and the machining surface. However, a very small amount of cutting mist should be used because chlorine-based extreme pressure additives are used to generate environmental pollutants in the production process and cause occupational diseases of workers. In this study, medical titanium alloy (Ti-6Al-7Nb) was subjected to a processing experiment by selecting factors and levels affecting cutting power in the processing of the Aerosol Dry Lubrication (ADL) method using vegetable oil. The machining shape was a slot to sufficiently reflect the effect of the cutting depth. As for the measurement of cutting force, the trend of cutting characteristics was identified through complete factor analysis. The factors affecting the cutting force of ADL slot processing were identified using the reaction surface analysis method, and the characteristics of the cutting force according to the change in factor level were analyzed. As the cutting speed increased, the cutting force decreased and then increased again. The cutting force continued to increase as the feed speed increased. The increase in the cutting depth increased the cutting force more significantly than the increase in the cutting speed and the feed speed. Through the reaction surface analysis method, the regression equation for predicting cutting force was identified, and the optimal processing conditions were proposed. The cutting force was predicted from the secondary regression equation and compared with the experimental value.
식물성 오일 기반 바이오항공유 제조공정에서 수소첨가 업그레이딩을 위한 운전조건에 따른 탄화수소화합물의 특성
곽연수(Yeonsu Kwak),장정희(Jung Hee Jang),김성탁(Sungtak Kim),안민회(Minhwei Ahn),이은실(Eun-Sil Lee),한기보(Gi Bo Han),정병훈(Byung Hun Jeong),한정식(Jeong Sik Han),전철환(Cheol-Hwan Jeon) 한국유화학회 2018 한국응용과학기술학회지 Vol.35 No.3
바이오항공유 제조 공정 내 수첨업그레이딩 공정의 운전조건 선정은 반응물로부터 얻고자 하는 주생성물인 탄화수소 화합물에 대하여 바이오항공유로서 원하는 탄소수 분포의 물성을 갖도록 하기 위한 중요한 인자이다. 본 연구에서는 식물성 오일 유래 노말 파라핀계 탄화수소 화합물에 대한 수첨 업그레이딩 반응이 0.5 wt.% Pt/Zeolite 촉매 하에서 수행되었으며, 이를 통해 크래킹 반응과 이성질화 반응이 동반됨으로써 바이오항공유로서 물성을 갖는 탄소수 분포인 C 8 -C 16 에 해당하는 노말 파라핀계와 이소 파라핀계가 혼합된 탄화수소류 화합물이 제조되었다. 반응온도, 반응압력, 반응물 몰비와 공간속도를 변화하여 얻어진 생성물의 수율 및 조성을 분석하였다. 상기 공정 조건에 대한 정보는 수첨 업그레 이딩 반응특성의 이해뿐 아니라 향후 증류를 통한 바이오항공유 제조에 도움을 줄 수 있다. In bio-jet fuel production, selecting operating conditions of hydro-upgrading is of great importance to make iso-Paraffin rich hydrocarbons with carbon distribution including jet fuel range. Herein, iso-Paraffin rich biofuel including jet fuel range hydrocarbons (C 8 -C 16 ) is produced from simultaneous cracking and isomerization using n-Paraffin rich hydrocarbon derived from hydrotreated vegetable oil over 0.5 wt..% Pt/Zeolite catalyst. We report and analyze the yields and compositions in the produced hydrocarbons affected by various operating conditions, such as reaction temperature, reaction pressure, molar ratio of reactants, and weight hourly space velocity. Aforementioned operating conditions not only can help interpret the reaction dynamics of hydro-upgrading, but also further produce bio jet-fuel after distillation.
김영택(Young-Taeg Kim),김주연(Joo-youn Kim),안영길(Young-Gil Ahn),한정식(Jung-Sik Han),김호균(Ho Kyun Kim),이은일(Eun-Il Lee) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
Corrections for multibeam soundings were reviewed to improve the method for tide correction. There are four correction methods for navigation, sounding, error, and tide. Among them, tide correction method was mainly investigated. Currently, four tide correction methods, such as constants for correction (time difference and height ratio for tide) and numerical tidal model are reviewed to identify the strengths and weakness of each method, and corresponding improving ways. They need to be carefully examined to identify advantages and disadvantages for the hybrid method to correct tide.
김영택(Young-Taeg Kim),김주연(Joo-youn Kim),안영길(Young-Gil Ahn),한정식(Jung-Sik Han),김호균(Ho Kyun Kim),이은일(Eun-Il Lee) 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-
Corrections for multibeam soundings were reviewed to improve the method for tide correction. There are four correction methods for navigation, sounding, error, and tide. Among them, tide correction method was mainly investigated. Currently, four tide correction methods, such as constants for correction (time difference and height ratio for tide) and numerical tidal model are reviewed to identify the strengths and weakness of each method, and corresponding improving ways. They need to be carefully examined to identify advantages and disadvantages for the hybrid method to correct tide.
백진욱(Jin-Wook Baek),정근우(Keunwo Chung),김영운(Young-Wun Kim),서인옥(In-Ok Seo),한정식(Jung-Sik Han) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-
Polyol esters were synthesized by condensation reaction of polyols (PE and DIPE) and linear acids such as valeric acid, caproic acid, heptylic acid and caprylic acid. The structures of polyol esters were confirmed by gas chromatography. Hot tube test was used to measure thermal stability of polyol esters and its thermal properties depended on the structure of acid moiety contained in polyol esters.