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Ag 담지된 LaSrCoFeO<sub>3</sub> 섬유상 perovskite 촉매의 탄소 입자상 물질의 산화반응
이찬민,전유권,황호정,지윤성,권오찬,전옥성,설용건,Lee, Chanmin,Jeon, Yukwon,Hwang, Ho Jung,Ji, Yunseong,Kwon, Ohchan,Jeon, Ok Sung,Shul, Yong-Gun 한국화학공학회 2019 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.57 No.4
디젤엔진 시스템은 미세먼지 배출의 엄격해진 저감/제어 기준을 충족하기 위해서 산화촉매는 매우 중요한 기술 중에 하나이다. 본 연구에서는 효율적인 soot산화의 촉매로 Ag 나노입자가 loading된 $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ 섬유상 web 촉매를 제시하였다. 제조된 촉매는 FE-SEM, EDS mapping, XRD, XPS 분석을 통해 특성을 평가하였다. Soot 산화성능측정결과 Ag의 효율적인 촉매특성과 증가된 soot입자와 표면의 접촉면적으로 인하여 50% 산화온도 평가($T_{50}=490^{\circ}C$)에서 자연적인 산화보다 $151^{\circ}C$ 가속화된 것을 확인하였다. 따라서 Ag가 loading된 촉매와 3차원적인 web 구조는 soot 산화에 효율적인 촉매후보군으로 확인하였다. The catalytic combustion of particulate matter (PM) is one of the key technologies to meet emission standards of diesel engine system. Therefore, we herein suggest Ag loaded $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ perovskite web catalyst. They were produced by the electrospinning method. FE-SEM, EDS mapping, XRD, XPS were studied to investigate the crystal and morphological structures of loaded Ag particles and $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ perovskite web catalyst. Following the catalytic soot oxidation, we found that the Ag loaded $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ perovskiteweb catalyst showed the higher catalytic activities (e.g., $T_{50}=490^{\circ}C$) than the only $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ perovskite web catalyst (e.g., $T_{50}=586^{\circ}C$). Thus, this finding suggests that Ag loaded $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ perovskite web catalyst can be a promising candidate for enhancing the soot oxidation.
통계학적 해석에 의한 BTCA와 Cellulose 에스테르 가교결합의 최적화
이찬민 ( Chan Min Lee ),정일용 ( Il Yong Chung ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.4
A purpose of this research was to use the response surface analysis to evaluate the relative importance of factors providing optimum ester-cross linking of cellulose material. In pursuit of these goals, we have treated cotton broad cloth with 1 ,2,3,4-butanetetracarboxylic acid at different pH values. They were used with H3P04, NaH2P02, NaH2P04, Na2HP04, NaH2P02, Na3P04, catalysts to produce nonformaldehyde fabric finishes. Treatments were applied to all materials using a pad-dry-cure process. For the fully understood on the relationship of finish bath pH effect and cellulose esterification, the relative concentrations of chemical species were calculated from ionization constants. In this research, the response surface analysis was used for the correctly mechanical limit values. The statistical parameters tested to correct reactants included amount of reaction and maximum degrees of wrinkle recovery, along with various concentration parameters. There were progressive changes in treated fabric wrinkle recoveries as agents and catalyst of pH levels decreased.
이찬민 ( Chan Min Lee ),정일용 ( Il Yong Chung ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.4
A purpose of this research was to use the response surface analysis to evaluate the relative importance of factors providing simulated optimum ester-crosslinking of cellulose. In pursuit of these goals, we have treated cotton broad cloth with 1,2,3-propanetricarboxylic acid at different pH values. They were used with H3P04, NaH2P02, NaH2P04, Na2HP04, NaH2P02, Na3P04, catalysts to produce nonformaldehyde fabric finishes. Treatments were applied to all materials using a pad-dry-cure process. For the fully understood on the relationship of finish bath pH effect and cotton cellulose esterification, the relative concentrations of chemical species were calculated from ionization constants. In this research, the response surface analysis was used for the simulated mechanical limit values. The statistical parameters tested to correct reactants included amount of reaction and maximum degrees of wrinkle recovery, along with various concentration parameters. There were progressive changes in treated fabric wrinkle recoveries as agents and catalyst of pH levels decreased.
이찬민 ( Chan Min Lee ),정일용 ( Il Yong Chung ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.3
Peroxodisulfates have been developed as low temperature bleaching agents for cotton to save the thermal energy. In this research we used the colar difference meter to determine the whiteness which booster peroxide will possibly make an effect on cotton at the low temperature process with different conditions agents, such as sodium hydroxide, sodium peroxodisulfate and potassium peroxodisulfate. The peroxide bleaching follows a laboratory experiments, using a statistical plan for three variables: (1) the concentrations of hydrogen peroxide (2) sodium hydroxide (3) the temperature of bathing. The purpose of this research was to use the response surface analysis method to evaluate the relative importance of actors providing optimum whiteness. A ridge analysis data on whiteness, results in 3-D surface diagrams for optimizing the concentrations of hydrogen peroxide and sodium hydroxide at about 42-52℃.
Chan Min Lee(李贊民) 한국경영사학회 2003 經營史學 Vol.30 No.-
The purpose of this study is first to identify the historical development of American accounting education since 16th century to the present. Prior to the Wharton School of the University of Pennsylvania at which first collegiate level of accounting course was offered in 1883, American accounting education was mostly conducted by Individual teachers and textbook authors and thereafter, private schools such as the Bryant and Stratton, and Packard business college. Since AAPA(American Association of Public Accountants) was organized in 1887, professional institutes such as AIA(American Institute of accountants), AAUIA (American Association of University Instructors in Accounting), AAA (Amencan Accounting Association), and AICPA(American Institute of Certified Public Accountants) have had a great effect on the development of accounting education in America. Recently AECC(Accounting Education Change Commission) awarded grants to the 11 selected universities to conduct changes in their accounting programs. The AECC identified desired capabilities, course content, and instructional methods for the education of professional accountants. Present accounting education in Korea can be improved by making the most of the AECC projects. Required competencies for the professional accountants should included communication skills, decision making skills as well as accounting knowledge, and active student participation through group work and case study is recommended.