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질소 상압플라즈마를 이용한 TiO<sub>2</sub> 박막의 표면개질 및 광활성 평가
임경택,김경환,박준,김경석,박유정,송선정,김종호,조동련,Lim, Gyeong-Taek,Kim, Kyung Hwan,Park, Jun,Kim, Kyoung Seok,Park, Yu Jeoung,Song, Sun-Jung,Kim, Jong-Ho,Cho, Dong Lyun 한국공업화학회 2009 공업화학 Vol.20 No.4
상압플라즈마 공정을 이용하여 $TiO_2$ 박막의 표면을 개질하고 광촉매 활성을 평가하였다. $TiO_2$ 박막은 $TiO_2$ 졸-겔 용액에서 유리판에 dip-coating법으로 코팅한 후 소성 온도와 소성 시간을 변화시켜 가면서 제조하였다. 표면 개질에 사용된 플라즈마는 질소 플라즈마였으며, 방전전력, 처리시간 등의 공정변수를 변화시키면서 실험을 수행하였다. 광촉매 활성은 UV-A와 형광등 하에서의 메틸렌 블루 분해효율을 바탕으로 평가하였다. XPS 분석 결과, 박막의 표면에 소량의 질소가 도핑되었음을 알 수 있었으며, 광촉매 효율은 UV-A와 형광등 하에서 모두 증가하였고, 특히 형광등 하에서 좀 더 증가하였다. $TiO_2$ thin films were surface-modified with atmospheric plasma and their photocatalytic activities were evaluated. The films were deposited on glass plates by dip-coating in a $TiO_2$ sol-gel solution and sintered at various temperatures for various times. Nitrogen plasma was used for the modification and the experiments were carried out varying operational parameters such as discharge power and treatment time. Photocatalytic activity was evaluated based on the degradation efficiency of methylene blue (MB) under irradiation of UV-A and fluorescent light. According to XPS analysis, a little amount of nitrogen was found to be doped in the film surface after the modification. As a result, photocatalytic activity increased under irradiation of UV-A and fluorescent light, especially fluorescent light.
바이오매스 저장고 내부 비산먼지 포집용 PTFE 멤브레인 연구
임경택 ( Kyung-taek Lim ),서명조 ( Myoung-jo Seo ),정진도 ( Jin-do Chung ) 한국환경기술학회 2021 한국환경기술학회지 Vol.22 No.2
In the fuel shed of a biomass SRF power plant generates a large amount of high concentration of scattered dust, which can lead to health problems, safety and facility accidents for field workers. This study was conducted to develop a collection technology suitable for the characteristics of biomass scattering dust. A PTFE membrane with a pore size of 0.05 to 10 ㎛ was developed and laminated on a felt to make a filter bag. PTFE membrane filter bags are used in dust collection systems that require durability, high temperature and chemical resistance to efficiently remove fine dust and maintain high-efficiency performance for a long time. The PTFE membrane filter bag is a surface filtration method that prevents fine dust from penetrating the inside of the filter material, thus maintaining filtration efficiency and a long service life. It has efficiency of collecting more than 99.94 % needle-shaped scattering dust.
산안법 관리대상물질의 변이원성 검색을 통한 GLP 유전독성 시험대상 후보물질의 선정
임경택 ( Kyung Taek Rim ),임철홍 ( Cheol Hong Lim ),안병준 ( Byung Joon Ahn ) 한국산업보건학회 (구 한국산업위생학회) 2015 한국산업보건학회지 Vol.25 No.3
Objectives: There is a requirement to select target materials for mutagenicity(Genotoxicity) testing, so we determined to set the test priorities of them by searching the related database. Methods and Results: We searched a number of databases to find information on mutagenicity tests with chemicals under the Occupational Safety and Health Act(OSH Act), such as KOSHANET, National Toxicology Program(NTP), European Chemicals Agency(ECHA), US National Library of Medicine(NLM), and Genetic Toxicology Data Bank(GENE-TOX), as well as ChemIDplus webpage, and presented the information. Also we anticipated their hazards with ACToR sites to confirm the 58 mutagenicity(Genotoxicity) tests we will perform. Conclusions: We presented target materials for mutagenicity testing with specific GLP tests consisting of reverse mutation(Ames), chromosomal aberration and micronucleus test.
임경택(Kyung-Taek Rim),임철홍(Cheol-Hong Lim),김현영(Hyeon-Yeong Kim),차신우(Shin-Woo Cha),허용(Yong-Heo),윤진하(Jin-Ha Yoon),김형아(Hyung-A Kim) 한국환경보건학회 2017 한국환경보건학회지 Vol.43 No.1
Objectives: In this study, we seek to perform a priority selection for test substances for chronic inhalation toxicity studies, including acute and subchronic inhalation toxicity studies, which are to be performed after the construction of a chronic/carcinogenicity inhalation toxicity study facility and enactment of pertinent legislation. Methods: Through this study, qualitative and quantitative priority evaluation of test substances according to acute, subchronic and chronic categories were respectively performed and priorities were suggested by expert group review, redundancy and other methods. Meanwhile, a draft on test substance selection criteria, procedures and methods referring to the National Toxicology Program (NTP) system was proposed. Results: This study selected priorities for candidate substances for chronic inhalation toxicity studies to be conducted from 2016. Conclusions: In the future, by assessing in advance the toxicological effects of chemicals to which workers can be potentially exposed in the workplace via long-term inhalation, expected health disturbances among workers will be reduced and it is anticipated that occupational disease induced by chemicals will be effectively prevented.
흡입노출에 의한 만성, 발암성시험 대상물질 및 우선순위 선정 연구
임경택 ( Kyung Taek Rim ),임철홍 ( Cheol Hong Lim ),안병준 ( Byung Joon Ahn ) 한국산업위생학회 2014 한국산업보건학회지 Vol.24 No.4
Objectives: There is requirement to select candidate materials for chronic inhalation/carcinogenicity testing, so we would like to set the priority of candidate materials. Methods and Results: We recommend the priorities for candidate materials based on the chemicals stipulated in the Occupational Safety and Health Act(OSHAct) and the Toxic Chemicals Control Act(TCCA) in Korea. Conclusions: We presented candidate chemicals consisting of solids(powders), gases and liquids(Such as organic solvents) with priorities.
Compositional Quenching 으로 제조한 PP / PU 블렌드의 모플로지 및 물성
임경택(Gyeong Taek Lim),주민혁(Min Hyuk Ju),김도형(Do Heyoung Kim),송기찬(Ki Chan Song),김수경(Su Kyung Kim) 한국고무학회 2001 엘라스토머 및 콤포지트 Vol.36 No.3
N/A Polypropylene(PP)/Polyurethane(PU) blends with reactive compatibilizers were prepared by the compositional quenching process. Malefic anhydride grafted PP(MPP) and hydroxyethyl maleimide grafted PP(HPP) were introduced as reactive compatibilizers. The formation of HPP and the reactions of compatibilizers with the PU components were confirmed by FT-IR spectroscopy. The morphology, tensile properties, thermal stability, and surface property were studied. The blends prepared by the compositional quenching showed better dispersed domain morphology than the melt blends. The PU domain size became more uniform and reduced in size with increasing the amount of compatibilizers. The blends with HPP showed slightly smaller domain size than the blends with MPP. The blends with compatibilizers all showed improved tensile properties, surface property, and thermal stability due to the interfacial adhesion effect. The blends with MPP showed higher surface energy than the blends with HPP, but the latter showed better thermal stability compared to the former.