http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
생물화공 에너지 / 환경 / 열저장을 위한 sodium acetate trihydrate 및 stearic acid 의 core 제조와 캡슐화
윤우석(Woo Sug Yoon),설용건(Yong Gun Shul),김종국(Jong Kuk Kim),주현규(Hyun Ku Joo),전명석(Myung Suk Cheon),이태규(Tae Gyu Lee) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.5
Cores(< 1 ㎜ diameter) of organic stearic acid(SA) and inorganic sodium acetate trihydrate(SAT) as phase change material(PCM) with a melting point in the range of 50-60℃ were manufactured. Single-layer coating was performed for 5A cores with poly urethane(PU), poly methyl methacrylate(PMMA), and silicon, respectively, while tertiary-layer coating was performed for SAT cores with PMMA and Wax. In case of SAT, gelatin as thickener and sodium pyrophosphate decahydrate(Na₄P₂O_7·10H₂O) as nucleator were added to prevent the phase separation and the supercooling respectively. Coated PCMs were analyzed by optical microscopy, scanning electron microscopy(SEM), thermogravimetry(TG), arid differential scanning calorimetry(DSC) to investigate their morphology, coating thickness, thermal stability. As a result, we obtained the ball-shaped PCM cores with the uniform coating thickness of 10-20 ㎛, constant latent heat of 50-60 ㎈/g and 35 ㎈/g in case of SAT and SA respectively. But l0 ℃ of supercooling was observed for SAT after 12th cycle of thaw-freezing test, while no supercooling was observed for the SA coated with PU. Thermal stability of the coating polymers used in SA decreased in the order of PU, PMMA and silicon.
공업화학 촉매 / 반응공학 / 나노크기의 Fe/Ti 혼합광촉매의 제조 및 가시광선 활용 타당성 조사
윤우석(Woo Sug Yoon),설용건(Yong Gun Shul),주현규(Hyun Ku Joo),전명석(Myung Seok Jeon),이태규(Tai Kyu Lee) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.4
In this study, iron-doped TiO₂(Fe/Ti) mixed oxide nanoparticles were prepared with the Fe^(3+) content varying from 2.5 up to 99.5 ㏖% to shift the absorption onset into the visible part, and to enhance the efficiency by retarding the e^--h^+ recombination. While they were characterized by UV/VIS, TEM-EDP, XRD, EDAX, and XPS, photonic efficiency was also investigated with the degradation rate of dichloroacetate (DCA) and light intensity measured by actinometry (2.68μE/sec). TEM-EDP and XRD showed that particles were in the form of anatase with the diameter of ca. 4 ㎚. Appreciable red-shift in UV/VIS absorption spectra was observed with the addition of Fe, starting UV/VIS absorption in the case of 10% Fe/Ti at around 0.5 eV less than in nano-sized pure TiO₂(around 3.42 eV). EDAX verified that the amount of Fe in the prepared mixed oxides was obtained as wished, and XPS revealed that Fe(III) existed in TiO₂lattice. Measured photonic efficiency turned out to be increased up to 0.22 at 10 ㏖% Mo, and then decreased as Fe content kept increasing higher than that. This was explained by the changing prevailing phenomena - electron trapping and recombination - as the amount of dopant increased. While photocatalytic decomposition of DCA was not taken place with pure TiO₂ using a 385 ㎚ cut-off filter, DCA degradation rate with 10% Fe/Ti was the same as that with pure TiO₂with a 320 ㎚ cut-off filter under the same experimental conditions. From this result, it was concluded that the absorption of light around 400 ㎚ was for the bandgap transition and could be used to degrade the contaminated organics.
공업화학 촉매 / 반응공학 / 나노크기의 Mo/Ti 혼합광촉매 제조 및 특성조사
윤우석(Woo Sug Yoon),설용건(Yong Gun Shul),주현규(Hyun Ku Joo),전명석(Myung Seok Jeon),이태규(Tae Kyu Lee) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.3
In this study, molybdenum-doped TiO₂(Mo/Ti) mixed oxide nanoparticles were prepared with the Mo^(5+) content varying from 0 up to 2.5 ㏖% to shift the absorption onset into the visible part, and to enhance the efficiency by retarding the e^--h^+ recombination. They were characterized by UV/VIS, TEM-EDP, XRD, EDAX, and XPS. Photonic efficiency was also investigated with the degradation rate of dichloroacetate(DCA) and light intensity measured by actinometry(2.68 μE/sec). TEM-Electron diffraction and X-ray diffraction patterns showed that particles were in the form of anatase with the diameter of ca. 4 ㎚. Appreciable red-shift in UV/VIS absorption spectra was observed with the addition of Mo, starting UV/VIS absorption in the case of 2.5%Mo/Ti at around 0.22 eV less than in nano-sized pure TiO₂(around 3.42 eV). EDAX verified that the amount of Mo in the prepared mixed oxides was obtained as wished and XPS revealed that Mo(V) existed in TiO₂lattice. Measured photonic efficiency turned out to be increased up to 0.28 at 0.5 ㏖% Mo, and then decreased as Mo content kept increasing higher than that. This was explained by the changing prevailing phenomena - electron trapping and recombination - as the amount of dopant increased.
박성현,고기원,박준범,문덕철,윤우석,Pak, Song-Hyon,Koh, Giwon,Park, Junbeom,Moon, Dukchul,Yoon, Woo Seok 대한자원환경지질학회 2015 자원환경지질 Vol.48 No.6
제주도 수문지질 종합 해석시스템 구축 연구의 일환으로 수행된 제주도 공공 관정 지질주상도 데이터베이스 구축결과를 소개한다. 1970년대부터 개발된 제주도 전역의1,200여 개 공공 관정의 지질주상도를 수문지질 조사소(炤)${\Pi}$맙$^{\circ}$ 범용할 수 있도록 6개의 속성 테이블로 구분하여 세부 정보를 데이터베이스화하여 분석을 수행한 결과, 기존 공공 관정지질주상도 이용에 다음과 같은 문제점이 있는 것으로 나타났다. 즉, (1) 지질주상도 암석명의 통일성 결여, (2) 화산쇄설층 및 사력층 개념 정립 필요, (3) 대수층 정보 불포함, (4) 상당수 관정에 대한 스크린설치 구간 심도 미기재, (5) 지질주상도 작성자별 기재 사항 및 내용상의 상이성 등이다. 연구팀은 상기와 같은 문제점들을 개선하기 위해 지질주상도상의 화산암 및 퇴적암 명칭을 재정립함과 아울러, 상용화된 데이터베이스 형식의 지질주상도 프로그램을 이용해 표준화된 입력과 출력형식 생성이 가능한 제주도 공공 관정 지질주상도 데이터베이스를 구축하였다. 새롭게 설계된 입력 테이블을 이용한 지질주상도 프로그램은 데이터베이스 입력 형식 기반을 가지고 있어, 사용자가 지정한 표준화된 입력 구조를 통해 지질, 관정 시추 및 시험 데이터들을 저장하여 데이터베이스화 함과 동시에 지질주상도와 단면도 출력에도 이용할 수 있다. 또한 지하수 관측 및 양수시험 결과 등의 새로운 자료도 데이터베이스 구조의 변경없이 쉽게 추가될 수 있다. 본 연구를 통해 구축된 지질주상도 데이터베이스는 향후 개발되는 관정들의 표준 데이터베이스 기준으로 활용됨으로써, 일관성 있는 지질주상도 작성과 수문지질 종합연구에 크게 도움이 될 전망이다. 또한, 현재 추진 중인 제주도 수문지질 해석시스템 개발과 기후변화에 대응한 통합수자원관리계획 기반기술을 뒷받침해 주는 초석이 될 것으로 기대된다. This study introduces newly implemented geological well logs database for Jeju public water wells, built for a research project focusing on integrated hydrogeology database of Jeju Island. A detailed analysis of the existing 1,200 Jeju Island geological logs for the public wells developed since 1970 revealed six major indications to be improved for their use in Jeju geological logs DB construction: (1) lack of uniformity in rock name classification, (2) poor definitions of pyroclastic deposits and sand and gravel layers, (3) lack of well borehole aquifer information, (4) lack of information on well screen installation in many water wells, (5) differences by person in geological logging descriptions. A new Jeju geological logs DB enabling standardized input and output formats has been implemented to overcome the above indications by reestablishing the names of Jeju volcanic and sedimentary rocks and utilizing a commercial, database-based input structured, geological log program. The newly designed database structure in geological log program enables users to store a large number of geology, well drilling, and test data at the standardized DB input structure. Also, well borehole groundwater and aquifer test data can be easily added without modifying the existing database structure. Thus, the newly implemented geological logs DB could be a standardized DB for a large number of Jeju existing public wells and new wells to be developed in the future at Jeju Island. Also, the new geological logs DB will be a basis for ongoing project 'Developing GIS-based integrated interpretation system for Jeju Island hydrogeology'.