고온에서 HAN 계열 추진제 액적의 거동에 대한 연구

황창환(Chang Hwan Hwang),백승욱(Seung Wook Baek),한조영(Cho Young Han),김수겸(Su Kyum Kim),전형열(Hyung Yeol Jeon) 한국연소학회 2012 KOSCOSYMPOSIUM논문집 Vol.- No.45

The droplet behavior of 83.9 wt.% HAN water solution was investigated experimentally with various ambient temperature and nitrogen environment. At the initial stage of evaporation under thermal decomposition temperature of HAN, gradual decreasing of droplet diameter was observed. After that, the droplet started to expand due to the internal pressure build up by water nucleation inside the droplet. The micro explosion was observed at higher temperature than the decomposition temperature of HAN and the remaining droplet showed similar behavior of single composition droplet. The decreasing rate was augmented as the ambient temperature increasing.

Equivalent Circuit Analysis of Induction Motors Considering Magnetic Saturation for Automotive Applications

Su‑Jin Lee,김성일,Pil‑Wan Han,김창업 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4

This paper deals with the characteristics analysis of 3-phase induction motors for electric power steering applications by combining fnite element analysis with an equivalent circuit model. Induction motors for automobiles have high magnetic saturation due to size limitations. Accordingly, to improve the accuracy of the equivalent circuit analysis, it is necessary to consider the magnetizing reactance according to the magnetizing current. An equivalent circuit analysis method that takes into account the magnetic saturation of 3-phase induction motors is proposed and verifed through a test.

Comparative analysis of bovine maternal corpus luteum microRNAs with aberrant and normal developed cloned fetus at late gestation

Xiaohu Su,Shenyuan Wang,Guangqi Gao,Xinyu Zho,Lidong Han,Guanghua Su,Jiaqi Zhang,Wanfu Bai,Xiuying Wang,Guangpeng Li,Li Zhang 한국유전학회 2020 Genes & Genomics Vol.42 No.3

Background The development efficiency of cloned cattle is extremely low (< 5%), most of them were aborted at late gestation. Based on our previous studies, some recipient cows with a cloned fetus would present as engorged uterine vessels and enlarged umbilical vessels randomly. Abortion involves both maternal and fetal factors. Objective Our aim was to explore this phenomenon by microRNAs expression profile analysis of maternal corpus luteum (CL), which was related to pregnancy maintenance. Methods The present study provided the comparison of maternal CL miRNAs expression of abnormally and normally developed cloned bovine fetus at late gestation (~ 210 days) using RNA-Seq technology. Results We selected two abnormally pregnant cows (abnormal group, AG) and three normally pregnant cows (normal group, NG) and acquired valid reads of 9317,261–12,327,185 (~ 84.53–91.28%) from five libraries. In total, we identified 981 conserved miRNAs and 223 novel miRNAs. 1052 miRNAs were co-expressed, 124 miRNAs were uniquely expressed in AG, and 93 miRNAs were uniquely expressed in the NG. Compared with NG, 11 were significantly overexpressed, and 22 were downregulated (p < 0.05) at AG among 1052 co-expressed miRNAs. The differentially expressed miRNAs-targeted genes were further analyzed by Gene Ontology and KEGG pathway analysis. Notably, the steroid biosynthesis pathway was a significantly enriched term (p < 0.01), which may affect the secretion of progesterone. Conclusion Our research suggested that abnormal miRNAs expression of bovine maternal CL may affect the pregnant status at late gestation.

한강하구지역에서 월동하는 재두루미(Grus vipio)의 개체군 감소

이화수(Hwa-Su Lee),신주열(Ju-Yeol Shin),이시완(Si-Wan Lee),강태한(Tae-Han Kang),윤순영(Soon-Young Yoon),김정수(Jungsoo Kim) 한국조류학회II 2012 한국조류학회지 Vol.19 No.4

김포시와 고양시 일대의 한강하구 지역은 우리나라에서 재두루미의 가장 중요한 월동지 및 중간기착지로 알려져 있지만, 이 지역의 조류 서식환경은 심각한 개발압력과 인간의 간섭으로 인해 지속적으로 나빠지고 있다. 따라서 본 연구에서는 2007-2008년과 2011-2012년의 월동시기에 본 지역에 도래하는 재두루미를 대상으로 월동 개체군 크기 변화와 월동지역 내에서 과거와 현재의 취식지역 이용 현황 등을 조사하여 개발행위가 이들의 서식에 미치는 영향을 확인하였다. 본 지역에서 월동하는 재두루미 개체군은 평균 124.9개체(2007-2008년)에서 59.0개체(2011-2012년)로 감소하였으며, 주요 취식지역에서 확인된 개체수는 평균 77.7개체에서 24.1개체로 감소하여 월동개체군의 감소폭에 비해 주요 취식지역의 이용 개체수의 감소폭이 더 크게 나타났다. 유형별 분석에서는 가족군에 비해 무리군의 개체수가 많이 감소한 것으로 나타났으나, 홍도평 지역의 가족군 이용 개체수는 변화가 나타나지 않았다(Mann-Whitney test. Z=-0.26, p=0.979). 그리고 과거 다수의 재두루미가 주요 취식지역으로 이용하였던 송포동과 평동지역은 2012-2013년 조사에서는 거의 이용하지 않는 것으로 나타났다. 이는 위 지역의 개발행위(예: 제 2자유로 건설 등)와 깊은 연관성이 있는 것으로 생각된다. Han-river estuary in Gimpo and Goyang city is well known as one of the most important wintering and stopover sites for migrating White-naped Crane (Grus vipio) in Korea. Nowadays, habitat quality of this area is getting worse due to serious development pressure and high human disturbances. So, we wanted to know whether development actions affected total wintering population change in Han-river estuary and feeding group pattern of White-naped Crane in main feeding habitats between the 2007-2008 and 2011-2012 wintering period. Average wintering population was decreased 124.9 to 59.0 and population of main feeding site also decreased 77.7 to 24.1. But decrease rate of main feeding site population was higher than total wintering population. Non-family feeding population was more decrease than family feeding population in the flock type analysis. But family feeding population of Hongdopyong was maintained from past and present (Mann-Whitney test. Z=-0.26, p=0.979). However, almost all White-naped Crane din not use both feeding sites, Pyong-dong and Songpo-dong, where were deteriorated habitat quality by human act.

교과 어휘 학습을 위한 교수 학습 방법 일고(一考)

한은수 ( Eun Su Han ) 근역한문학회 2011 한문학논집(漢文學論集) Vol.33 No.-

52% of elementary schools throughout Korea have been teaching Chinese characters as the schools` regular curriculum(subjective, discretion activity, and special activity), and 57% included the Chinese education in the category of extra curricular activities (Morning Self-studies, After school study program). Elementary students in Korea generally complete the goals and content that is required in the education process of a textbook. Although current textbooks are only inscribed in Han-geul, most of the Han-geul vocabulary was based in Chinese characters, and therefore brings big trouble to one`s studies when one can not comprehend the meaning of the Chinese character vocabulary. So for elementary students to faithfully complete their academic studies, they essentially need a deep understanding of the Chinese character vocabulary related to the vocabulary of a subject. And in this manuscript, we will examine the actual situation of vocabulary used in subject textbooks and observe how teaching and learning was done at the scene of education. As a result, we discovered that an elementary 1st Grader needs to understand the meaning of 70 Chinese characters to complete one subject, and some subjects required understanding up to 300 Chinese characters. This type of subject vocabulary deepens more as the academic year rises. For example, for 6th grade Korean and Social Studies, a student needs to understand 1300 vocabularies to understand the subject. Since it is difficult for elementary learners to understand the numerous vocabularies above, it is necessary to at least concentrate on the concept of vocabularies. At the elementary school scene, the Chinese script was studied mainly through various Chinese character study methods of reading, writing, and activity. However, the teaching and learning methods of Chinese vocabulary has not been researched or exercised compared to the active studies done at elementary schools. This manuscript examined the Chinese characters vocabulary teaching and learning methods regarding the study of coined words, finding synonyms*antonyms studies, word puzzle playing studies, drawing a semantic network map studies and etc.. And through an analysis of some of the Chinese character teaching and learning methods, the outcome of these methods were rough and the content was slow. The practice of Chinese characters through subject studies of elementary school learners is not a study of the script, and the meaning of Chinese characters can differ according to the vocabulary. Therefore further research is recommended in this area to ensure internal stability to the studies of subject vocabulary that are in the mainstream of each academic subject.

자연과학적 데이터를 활용한 풍납토성 백제토기의 분류 방안 연구

문은정 ( Eun Jung Moon ),강희준 ( Hee Jun Kang ),한민수 ( Min Su Han ),이한형 ( Han Hyoung Lee ) 백제학회 2011 백제학보 Vol.0 No.5

본 연구는 풍납토성 출토 백제토기를 대상으로 현장에서 소성온도에 따라 토기를 분류할 수 있는 외형관찰 기준을 마련하는데 자연과학적 데이터를 활용하고자 하는 연구이다. 소성온도는 토기의 경도, 밀도 풍을 포함한 다양한 물리화학적 특성에 영향을 미친다. 이 중 현장에서 측정이 가능하고 유용한 것이 경도이다. 그러므로 우리나라의 발굴현장에서 적용하고 있는 경도 측정기준을 적용하여 토기를 분류하고, 자연과학적 분석을 통하여 이들 토기의 마이크로비커스 경도, 밀도, 흡수율, 조직의 유리질화도, 광물학적 특성 등을 측정하여 현장에서 적용하는 경도분류 기준과의 상관관계를 비교연구하였다. 그 결과, 발굴현장에서 동전의 긁힘에 의해 주로 행해지던 연질과 경질의 이분법적 분류는 연질과 연경질, 경질의 세 단계로 세분됨을 알 수 있었다. 소성 온도 추정 결과, 연질은 1,000˚C 이하, 연경질은 1,000~1,100˚C, 경질은 1,200˚C 이상에서 소성되었을 것으로 판단된다. 한편, 3단계로 분류되는 토기들의 각 단계별 외형적 공통점을 추출하여 자연과학적인 정밀분석 없이 육안관찰만으로 토기를 3단계로 분류할 수 있는 관찰기준의 제시를 시도하였다. 이러한 기준은 파괴분석을 하지 않고도 토기의 외형적 특징을 이용하여 토기의 대략적인 물성과 소성온도 추정을 가능하게 할 것으로 기대된다. 단, 이러한 기준은 풍납토성에서 출토된 한성백제시기의 토기 중에서 배류와 호류 등 색상이 단조로운 제한된 기종을 중심으로 한 결과라는 한계를 가진다. 따라서 추가적으로 여러 기종의 다양한 색상을 가진 토기들을 대상으로 풍납토성 출토 토기의 경도별 분류가 가능하도록 수정·보완하는 연구를 진행할 예정이다. Observation methods of appearance were studied to establish a systemized classification criteria according to the firing temperatures of excavated earthenware from the Pung-Nap Mud Castle. A firing temperature has an impact on various physical and chemical properties including hardness and density of earthenware. Of all the properties, hardness can be measured in situ. Therefore, the earthenware were categorized according to the measurement method of hardness which can be applied and useful method for archaeological sites. In addition, the correlation between the measurement method and micro Vickers hardness, absorptance, degree of vitrescence and mineralogical properties of the earthenware were studied by means of a natural scientific analysis. The result suggests that the dichotomous way of classification based on a scratching method determining whether it is hard or soft should be categorized into three stages; soft, soft/hard and hard. According to the presumption of the firing temperature, it is believed that the earthenware were fired at below 1,000℃, 1,000~1,100℃ and 1,200℃ respectively. The systemized observation method was proposed to enable the earthenware to be categorized into three stages using visual observation without a detailed scientific analysis. The method will make it possible to estimate roughly the physical properties and firing temperature of the earthenware with only visual observation. However, it has limits as it was established focusing on certain types such as Cups and Jars among the Han-Sung Baek-Je earthenware. Therefore, a further study is planned to be carried out on various objects excavated from Pung-Nap Mud Castle in order to enable categorization on the basis of hardness of the earthenware.

學校給食이 어린이 身體 發育ㆍ發達에 미치는 影響

韓相俊,吳壽一,金世煥 江原大學校附設 體育科學硏究所 1991 江原大學校附設體育科學硏究所論文集 Vol.- No.16

To analyze the effects of provision of school lunch (PSL)on the development of children physical physique, 666(boys 343, girls 323)students of K. elementary school (PLS) were compared with 981(boys 491, girls 490)students of C. and K. elementory schools (none PSL) concerning about standing height, sitting height, body weight, chest circumference, and Rohrer index. The conclusions from the results were as follows : 1) There was no significant differency on standing height between PSL and non PSL groups. 2) It shows significantly high on sitting height in the none PSL group of girls of 10 years old. 3) On the body weight and Rohrer index the boys group in PSL 11 years old were presented significantly high, but there were no difference in the other's age group. 4) In the group of 10 years old boys and of 10,11 and 12 yeas old girls were showed significantly higher status on chest circumference in none PSL groups.

초등학교 자녀의 구강보건에 관한 학부모의 인식 및 행동

한수진,문혁수,정재연,김영경,이병진,김은경,정혜련 韓國學校保健學會 2001 韓國學校保健學會誌 Vol.14 No.1

The purpose of this study was to collect basic data for the development of oral health education program of parents and to encourage their actual interest and participation in school oral health program. The authors surveyed parents' awareness and behaviors about the oral health of their children. The subjects in this study were 193 parents of elementary school children in Seoul. The collected data were analyzed, the obtained results were as follows: 1. Thirty-five percent of the parents investigated paid a regular visit to a dental clinic. The must common tooth brushing time among them was after dinner, the second was after breakfast, and this was followed by before bedtime and before breakfast. 2. Ninety-four percent of the parents responded that prevention is necessary, 92.2% had a plan to visit a dental clinic to prevent dental caries, and 60.1% experienced receiving pit and fissure sealants. Ninety-seven percent responded that they did check their children's dental caries. 54.9% chocked their children's oral status after tooth brushing. The parents who visit a dental clinic on a regular basis were more likely to check their children's teeth after tooth brushing than those who don't(P<0.05). 3. Eighty eight percent of respondents wanted to keep the fluoride mouth rinse program. 4. It is recommended that an oral health education program be developed for parents to visit dental clinics on a regular basis, to educate as to the right tooth brushing time, and to check out their children's oral status after tooth blushing.

乳牛의 繁殖障害에 關한 年化學的인 硏究

韓壽南 서울대학교 1972 서울대학교 論文集 Vol.22 No.-

Biochemical studies for 27 dairy cows with reproductive disturbance and 3 normal dairy cows were undertaken and the results obtained are summarized as following. 1. The water content of blood was higher, 88.05 g/dl, in dairy cows with reproductive disturbance than in normal dairy cows, 77.5g/dl. The difference was significant under the physiological condition. 2. Value for glucose in blood was higher, 67.04 ㎎/dl, in dairy cows with reproductive disturbance than in normal dairy cows, 63.25 ㎎/dl. 3. Value for calcium in serum was higher, 6.31 ㎎/dl, in normal dairy cows than in dairy cows with reproductive disturbance, 5.86 ㎎/dl. 4. Value for phosphorus in serum was higher, 7.24 ㎎/dl, in dairy cows with reproductive disturbance than in normal dairy cows, 7.06 ㎎/dl. 5. Value for hemoglobin in blood was slightly higher, 10.54 g/dl, in dairy cows with reproductive disturbance than in normal dairy cows, 10.16 ㎎/dl. 6. Value for protein in serum was slightly higher, 7.84 g/dl, in dairy cows with reproductive disturbance than in normal dairy cows, 7.83 g/dl. 7. The Rf value of estrogen was slightly lower, 0.86, in dairy cows with reproductive disturbance than in normal dairy cows, 0.88. 8. The Rf value of progestron was lower, 0.52, in dairy cows with reproductive disturbance than in normal dairy cows, 0.69.

韓方再活醫學科 內院患者의 主訴에 다른 體熱診斷 結果 考察

韓武圭,許秀榮 동서의학사 1999 동서의학 Vol.24 No.2