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Kyu-shik Jeong,정원일,Jae-yong Chung,Mi-young An,Chae-yong Jung,Gyoung-jae Lee,Jong-soo Kang,Byeong-cheol Kang,Young-heun Jee,Bruce H Williams,Young-oh Kwon,Da-hee Jeong 대한수의학회 2003 Journal of Veterinary Science Vol.4 No.2
Cirrhosis Occurring in a Young Woodchuck (Marmota monax) Due to Vertical Transmission of Woodchuck Hepatitis Virus (WHV)Da-hee Jeong, Won-il Jeong, Jae-yong Chung, Mi-young An, Chae-yong Jung, Gyoung-jae Lee1, Jong-soo Kang1, Byeong-cheol Kang2, Young-heun Jee3, Bruce H Williams4, Young-oh Kwon5 and Kyu-shik Jeong*College of Veterinary Medicine, Kyungpook National University, Daegu 702-701, Korea1Shinwon Scientific Co., LTD, Research Institute, Suwon, Korea2Clinical Research Institute, Seoul National University, Seoul 110-744, Korea3College of Veterinary Medicine, Jeju National University, Jeju 690-756, Korea
Yong‑Min Kim,Ha‑Seung Seong,Jung‑Jae Lee,Da‑Hye Son,Jin‑Su Kim,Soo‑Jin Sa,Young‑Sin Kim,Tae‑Jeong Choi,Kyu‑Ho Cho,Joon‑Ki Hong,Jung‑Woo Choi,Eun‑Seok Cho 한국유전학회 2020 Genes & Genomics Vol.42 No.12
Background: Woori-Heukdon (KWH) is a Korean synthetic pig breed generated using Chookjin-Duroc (KCD), Chookjin-Chamdon (KCC), and their crossbreds. Currently, there is a severe lack of studies investigating the Korean breed populations including wild boars (KWB) throughout the genome. Objective: This study was performed to investigate the genetic characteristics of Korean pig populations at the genome-wide level. Methods: Using the SNP dataset derived from genotyped and downloaded datasets using the Illumina PorcineSNP60K BeadChip, we compared the genomes of 532 individuals derived from 23 pig breeds to assess the genetic diversity, inbreeding coefficient, genetic differentiation, and population structure. Results: KWB showed the lowest average expected heterozygosity (HE = 0.1904), while KWH showed the highest genetic diversity (HE = 0.02859) among Korean populations. We verified that the genetic composition of KWH, showing USD of 74.8% and KCC of 25.2% in ADMIXTURE analysis. In population structure analyses, KCC was consistently shown to be separated from other pig populations. In addition, we observed gene flow from Western pigs to a part of Chinese populations. Conclusion: This study showed that Korean native pigs, KCC have genetic differences in comparison with Chinese and Western pigs; despite some historical records and recent genetic studies, we could not find any clear evidence that KCC was significantly influenced by Chinese or Western breeds in this study. We also verified the theoretical genomic composition of KWH at the molecular level in structure analyses. To our knowledge, this is the first genomic study to investigate the genomic characteristics of KWH and KCC.
Consideration of Diluents Selection and Input Amounts of the Hunter Process for Tantalum Production
Jae‑Jin Sim,Sang‑Hoon Choi,Yong‑Kwan Lee,Sung Gue Heo,Taek‑Soo Kim,Seok‑Jun Seo,Kyoung‑Tae Park 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
Tantalum (Ta) is a heavy refractory metal with an atomic weight of 180.95 g/mol, a density of 16.6 g/cm3, and a high meltingpoint of 3017 °C. With its refractory characteristics, it shows excellent chemical and physical stability as well as corrosionand heat resistance at elevated temperatures. The demand for Ta metal and related compounds is increasing with the expansionof the electronics and chemical industries. The Hunter process was proven to be effective in producing Ta powder in1953. Hunter proposed a method in which potassium heptafluorotantalate (K2TaF7) was reduced by sodium (Na). Thus far,this process has been the primary commercial method to produce Ta powder. In this study, quantitative differences wereanalyzed for diluent selection. Additionally, consideration was given to changes in the caloric value depending on the inputamount of diluents. Finally, the optimum material input and the properties of the prepared Ta were analyzed. Stoichiometricratios of K2TaF7(1 mol), NaCl (6.2–6.7 mol), Na (5–7 mol) were weighed, to perform a metallothermic reduction reaction. After the reaction, the tantalum powder was recovered and the flush process was carried out. After that, it was dried in avacuum atmosphere. Physical properties such as oxygen concentration, PSA, ICP-OES, and XRD of powder were conductedto evaluate the characteristics of Ta powder that was finally manufactured.
외국문화 이식을 위한 외국어 실력을 대학교육기간내에 기를 수 있는 교과과정 및 교재와 설비에 관한 연구
최용재,박재만,박윤환,정봉택,최용섭 朝鮮大學校 1977 綜合論文集 Vol.1977 No.-
This paper aims to find ways of tackling stagnant factors in the foreign language education on the college level. Here the foreign language learning is geared to a working command of the foreign language with the view to having access of the advanced foreign technology. And the working command of the foreign language requires not only language skills but a thorough understanding of the cultural background of the language. However, to incorporate all of the cultural aspects into a textbook is a really exhaustive work and is too bulky for a short course to handle all the aspect of the culture. A partial mastery is to be recommended with a condition that a spiral approach must be used to cover pertinant aspects and, in some cases, peripheral aspects which play important key roles. As to the methodology of the lesson, this paper is not to side any one method and it rather intends to persuade using any method out of the whole spectrum of the methodolgy which comes handiest in the specific occasion. This paper also believes that "All methods are best!" However, the present situation in Korea seems to draw a conclusion on the foreign language education as a reading skill is most desirable. Reading materials must indeed be ones which cover all the aspects of the foreign culture in question and must also be such day-by-day reading materials as newspapers, magezines, and everyday documents. This paper eventually tries to make suggestions that; (1) the foreign language education should be extended over the full-four-year period of time with five to ten hours of the foreign language class a week; (2) only the elites should be admitted to the foreign language class who are to be screened by tests of aptitude, intelligence, motivation, and attitude; (3) the size of a class should not exceed the limit of ten students; (4) the text book should not be limited to a book, though it encloses every items of a culture, but be flexible to permit other every day reading materials come into the class; (5) language laboratory should be exploited; (6) a bilingual education is strongly recommended. This paper also gives way to textbook developers and teachers in the classrooms as to the efforts and merits of materializing and realizing the ideas enumerated here.
Chitosan 濾過 System을 利用한 새로운 中水道 工程의 開發과 溫泉水 淨化에 관한 硏究
김용범,백광욱,안병제,조영주,심재용 서울産業大學校 1994 논문집 Vol.39 No.1
각종 금속이나 중금속을 비롯하여 각종 오염물(SS, COD, BOD, CI 등)을 강력히 흡착제거하는 성능을 가진 chitosan(Cs)응집제와 여과사(SF) 및 활성탄 column(ACC)을 병용하여 hotel잡수와 온천사용수등의 정화실험을 행하여 생물학적 처리과정을 생략할 수 있는 사용수의 재활용 process(Fig. 1)를 개발하였다. 이 process에서 hotel 잡수의 경우 20ppm의 chitosan 투입으로 1차응집 처리하여 약 60%이상의 오염물을 제거한 후 여과사와 활성탄 column을 이용하여 최종적으로는 80~99%의 오염물을 제거할 수 있었다. 또한 온천수의 경우 20ppm의 chitosan 투입으로 1차응집 처리하여 약 50%이상의 COD와 BOD의 제거율을 달성할 수 있었다. 따라서 이러한 process를 산업현장에 적용할 경우 종전의 생물학적 공정을 생략하거나 소규모화하여 보다 간편하며 처리공간이나 경비등을 절감하면서도 사용수를 방류수 또는 재활용수 기준이내로 처리할 수 있음을 확인하였다. 본 연구는 수자원 보호나 수자원 재활용면에서 크게 기여 되리라 믿는다. A simplifid and economic process for recycling the used water discharged from a large scale residence(e. g. hotel and apartment etc.) was developed. The used water was purified through adsorption and flocculation of contaminants by chitosan at the first stage where the average removal rates of COD and BOD of the used water were found more than 60%. The previously treated water through flocculation by chitosan was subjected to filtration systems of a sand filter and an activated carbon column, and the average removal rates of COD and BOD were found more than 80%. The experimental results suggest that the biological process which is very popular in the treatment of the used water for the removal of COD and BOD can be omitted and expected to reduce a spacial and running expenditure. On the other hand, testing the used water discharged from hot springs with chitosan proves a possibility of development of a simple and economical process for the treatment of the used water to the criteria of recycled water quality without any addition of more complicated equipments and facilities.
박재용,황승민,임민규,오영규,박재용,한석영 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
This paper presents a reliability-based topology optimization (RBTO) using bi-directional evolutionary structural optimization (BESO). An actual design involves uncertain conditions such as material property, operational load and dimensional variation. Deterministic topology optimization (DTO) is obtained without considering of uncertainties related to the uncertainty parameters. However, the RBTO can consider the uncertainty variables because it has the probabilistic constraints. In this paper, the reliability index approach (RIA) is adopted to evaluate the probabilistic constraint. RBTO based on BESO starting from various design domains produces a similar optimal topology each other. Numerical examples are presented to compare the DTO with the RBTO.