• Journal of Advanced Marine Engineering and Technology
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• 제37권1호
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• pp.40-46
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• 2013

열전달 향상을 위하여 이차유동을 발생시켜 열전달을 증가시키는 방법에는 여러 가지가 있다. 본 연구에서는 수평채널에 다양한 형태의 립을 설치하여 유속을 변화시켰을 때의 열전달 및 압력강하 특성을 수치해석을 통하여 고찰하였다. 립은 수평채널의 아랫면에 설치하였고, 립의 높이는 5mm이다. 립이 $60^{\circ}$ 기울어지고 그루브도 설치된 경우 열전달 특성이 가장 우수하게 나타났는데, 이는 주유동이 립을 따라 흘러가면서도 유속이 어느 정도 유지되기 때문이다. 끊어진 립에서 주유동이 립의 저항을 적게 받으면서 압력강하가 가장 작게 나타났다. 모든 립의 형태에서 유속이 증가함에 따라 열전달이 향상되는 경향을 보였지만 성능계수는 감소하였다.

• 한국학교수학회논문집
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• 제3권1호
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• pp.177-188
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• 2000

Mathematics is extreme the differences of the scholarly attainments in comparison with other subjects at a middle school. Specially, the students at islands and places leave much to be desired the scholarly attainments standards of mathematics. Therefore, every school takes movement class according to level these days. And the small schools put in effect the cooperation of group work through the small groups. These classes are effective at the scholarly attainments extension to some degree, but each student is extreme the differences of scholarly attainments. On this, the small school was the subject of study at the present research and put in effect the cooperation of group work through the small groups. The students were divided in three groups; the top class, average, the low class, And they were offered the fitting textbooks matching the cooperation of group work and the opportunities of discovery learning fitting an individual ability and standard. Consequently, some educational materials were made, for example, question papers, commonness learning materials, choice learning materials. These materials were put in effect to the students to be able to succeed discovery learning. With this, the students were investigated an interest of mathematics and the influence giving at the studies attainment. And the students were put in effect the cooperation of group work through the small groups to improve uniformity and sturdiness of the mathematical education. The conclusion at the present research is as follows. 1) When the students put in effect the cooperation of group work through the small groups, the scholarly attainments of mathematics totally didn't display useful changes as improvement. However, the students of average and the low class gradually seemed to improve the scholarly attainments of mathematics as the help of the top class positively. 2) An individual and cooperation learning in the method of the cooperation of group work through the small groups displayed many changes at the learning attitude of the students by means of discovery learning thanks to the learning heads. 3) When the investigator put in effect the cooperation of group work through rather the small groups than the large groups, the numbers of the students experiencing interest about mathematics increased in 26% and this learning method should continue to progress.

• 한국동물생명공학회지
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• 제34권2호
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• pp.75-85
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• 2019

Omega-3 α-linolenic acid and omega-6 linoleic acid are essential fatty acids for health maintenance of human and animals because they are not synthesized in vivo. The purpose of this study was to evaluate the effect of α-linolenic acid and linoleic acid supplementation on in vitro maturation and developmental potential of porcine oocytes. Various concentrations of α-linolenic acid and linoleic acid were added into in vitro maturation medium, and we evaluated the degree of cumulus expansion, oocyte nuclear-maturation rate, blastocyst rate, blastocyst quality, and levels of prostaglandin E₂, 17β-estradiol, and progesterone in the spent medium. High doses (100 μM) of α-linolenic acid and linoleic acid supplementation significantly inhibited cumulus expansion and oocyte nuclear maturation, and prostaglandin E₂ synthesis also significantly decreased compared with other groups (p < 0.05). Supplementation of 50 μM α-linolenic acid and 10 μM linoleic acid showed higher quality blastocysts in terms of high cell numbers and low apoptosis when compared with other groups (p < 0.05), and synthesis ratio of 17β-estradiol / progesterone also significantly increased compared with control group (3.59 ± 0.22 vs. 2.97 ± 0.22, 3.4 ± 0.28 vs. 2.81 ± 0.19, respectively; p < 0.05). Our results indicated that supplementation with appropriate levels of α-linolenic acid and linoleic acid beneficially affects the change of hormone synthesis (in particular, an appropriate increase in the 17β-estradiol / progesterone synthesis ratio) for controlling oocyte maturation, leading to improved embryo quality. However, high doses of α-linolenic acid and linoleic acid treatment results in detrimental effects.

• The Korean Journal of Ecology
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• 제18권3호
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• pp.307-321
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• 1995

Division of ecoregions having respective functions was attempted through quantitative and qualitative analysis on vegetation diversity, and heterogeneity and on soil environment of the study sites. Field research was carried out in a square of 81 ㎢ around Andongpo (126°38'E, 37°30'N), Kimpo-gun, Kyonggi provice. Conventional methods applied are as follows: classical syntaxonomy by the Zurich-Montpellier School, interpolation method to determine the degree of diversity, heterogeneity and distribution pattern of vegetation, and correlation analysis between soil properties and plant communities. 41 plant communities were identified and composed of 6 forests, 4 mantle and 31 herb communities including 6 saltmarsh plant communities. In a mesh, number of plant communities was highly correlated to the number of species. The highest number of plant community and species was 25 communities·km-2·mesh-1 and 381 species· km-2·mesh-1 ,and the highest value of vegetation heterogeneity was 28.1 species· community-1·mesh-1. Their lowest numbers were 4 communities·km-2·mesh-1. and 28 species·km-2·mesh-1. and 7 species·community-1·mesh-1, respectively. Contour map on vegetation diversity and heterogeneity enabled us to establish two regions; coastal and inland vegetation. Isoline 〔150〕,〔10〕and〔10〕and〔15〕on the species diversity, the community diversity and the vegetation heterogeneity, respectively, were regarded as ecolines in the study area. Cl- content was recognized as the most important factor from correlation analysis between soil properties. Ordination of sites indicated that the study area be divided into two edaphic types: inland and coastal habitats. It was considered that the extent of desalinization in soil played a major role in determining the species composition in the reclamed area. By matching edaphic division of habitats with division of vegetation structures, designation of ecoregion was endorsed. The approach of current study was suggested as an effective tool to implement an assessment of the vegetation dynamics by the disparity of natural environment and anthropogenic interferences.

• 한국병원경영학회지
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• 제16권3호
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• pp.1-18
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• 2011

In this study, population census(2005 & 2008) from Statistics Korea and the statistical data of the number of hospital beds by healthcare facilities classification from Ministry of Health and Welfare were used. For analyzing distribution of hospital beds, hospital beds were classified as acute care beds, long-term care beds and all hospital beds, which is including acute and long-term care beds. Regional areas, which are city(si), county(goon) for the study and district(gu) were reclassified as metropolitan city, city(si) and county(goon). Because there were 165 regional areas in 2005 and 2008, 84 and 81 areas were classified as metropolitan city and/or city and county, respectively. Gini index were calculated for hospital beds from each year, and Lorenz curves were drawn. The following summary presents the findings of this study. Compared to the year 2005 and 2008, the Gini index was 0.24472, and hospital bed numbers increased slightly by 0.80% than in 2005. In case of acute care beds, the Gini index was 0.23797(0.13%), and there was no big difference; however, the Gini index for long-term care beds was 0.41091, and there was a 30.25% decrease, which shows improvement to reduce disparities. It might result from an increase in long-term care beds up to 476.2%. For geographical equality of hospital beds, the Gini index and Lorenz curve, which can be compared the degree of inequality in the distribution of hospital beds reasonably and possibly show statistical data, should be used. Through this study, the distribution policy of hospital beds should be established.

• 대한한방소아과학회지
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• 제18권2호
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• pp.161-177
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• 2004

Objective : There have been many programs to treat childhood obesity, since childhood obesity has shown up as a social problem. The purpose of this study was to find out considerable matters to manage Childhood Obesity Treatment Program (COTP). Methods : This study was made with reference to clinical progress notes of children with obesity, visiting the oriental medicine center, to take COTP from July 30th, 2003 to August 25th, 2004. COTP was consist of abdominal aroma massage, abdominal low frequency acupuncture therapy, auricular acupuncture therapy and behavior modification. Results : 1. Seven children who taken COTP started fat from young age and three started from about ten-year-old ages. 2. Six children have fat fathers, a child has fat parents and three children have no fat family member. 3. The obesity levels of Obesity Index(OI), Body Mass Index(BMI) and Rohler Index(RI) were different, used for evaluating the result of treatment, though they are used for a child. The result of OI reflected more sensitive from changes of weight than those of BMI and RI. 4. We got the better results with numbers of treatment and exercise. Conclusions : More correct standard are needed to estimate degree childhood obesity. And it is necessary to carry out obesity treatment program with behavior modification, for children with obesity. to be healthy adults.

• Parasites, Hosts and Diseases
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• 제43권3호
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• pp.75-92
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• 2005

Extensive previous studies on taxonomy, behavior/bionomics and control of Anopheles sinensis are reviewed and summarized. Recent molecular identification revealed that the population of An. sinensis complex includes An. sinensis, An. pullus, An. lesteri and at least two new species, and An. yatsushiroensis is synonmy of An. pullus. An. sinensis is the main vector specie of vivax malaria in Korea. Larvae of An. sinensis breed in wide range of habitats which are naturally-made clean water, stagnant or flowing; main habitats include rice fields, ditches, streams, irrigation cannals, marshes, ponds, ground pools, etc. Their host preferences are highly zoophilic. Human blood rate is very low ($0.7-1.7\%$); nevertheless An. sinensis readily feeds on man when domestic animals are not found near by. They feed on hosts throughout the night from dusk to dawn with a peak period of 02:00-04:00 hours; they are slightly more exophagic (biting outdoors); much larger numbers come into the room when light is on. Main resting places are outdoors such as grasses, vegetable fields and rice fields. A mark-release-recapture study resulted that $37.1\%$ was recaptured within 1 km, $29.4\%$ at 1-3 km, $21.1\%$ at 3-6 km, $10.3\%$ at 6-9 km and $2.1\%$ at 9-12 km distance. An. sinensis hibernate outdoors (mostly under part of dense grasses) during October-March. At the end of the hibernation period (March-April) they feed on cows at daytime. Until today any single measure to effectively control An. sinensis population has not been found. Indoor residual spray with a long-lasting insecticide can not reduce vector population densities, but shorten their life spans in some degree, so contributes to malaria control.

• 한국문헌정보학회지
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• 제44권4호
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• pp.413-433
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• 2010

이 연구는 공공도서관 디지털자료실을 구성하는 가장 중요한 요소인 정보자원의 유형별 중요성을 파악하고자한 사례연구이다. 공공도서관의 수적 증가와 함께 디지털 정보원을 매개로 한 정보서비스의 고도화에 있어서도 많은 진전이 있었지만 현재 공공도서관의 디지털 정보자원은 주로 디지털자료실이라는 공간을 중심으로 소극적으로 관리되고 있으며, 디지털 정보원을 활용한 서비스도 활성화 되고 있지 못한 것이 현실이다. 이 연구에서는 그 원인을 콘텐츠에서 찾고자 하였다. 시설투자에 비하여 적정한 규모를 확보하지 못한 정보자원 측면의 문제점을 살펴보고 공공도서관에서 디지털 정보원을 수집, 관리하는데 있어서 기본이 되는 콘텐츠 측면의 요소들에 어떠한 것들이 있는지 파악하고 각각의 중요도를 조사함으로써 향후 공공도서관의 디지털 정보자원 관리를 위한 시사점을 제공하고자 하였다. 이를 위하여 관련 연구와 해외 주요 공공도서관 사례로부터 정보자원에 해당되는 요소들을 추출하였고 이를 바탕으로 전문가 서베이를 거친 후 도출된 정보자원 요소들과 중요도를 조사하여 제안함으로써 향후 공공도서관의 디지털 콘텐츠 구성에 참고가 되고자 하였다.

• 한국식품영양학회지
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• 제18권2호
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• pp.115-126
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• 2005

This Quantitative study was investigated to examine the relationship between self-esteem on body image and disordered eating patterns in some university students. This study used a cross-sectional study design. Total 347 students participated in this study (88 male and 259 female) among three universities. The assessment of eating disorder was conducted by Eating Attitudes Test (EAT-26), a score of >or=20 identified individuals likely have an eating disorder, including anorexia nervosa and bulimia nervosa. Ideal body weight and current body weight were completed with self-evaluation. A distorted body image was independently related to the eating problem in the Logistic regression analysis. There were stronger relationships between their EAT-26 scores and their expected weight changes and weight control behaviors. Compared with the men, women showed highly wishful to loss for current body weight. In the relationship between score of EAT-26 and BMI distance by sex, levels of eating disorder showed linearly elevated toward increased BMI distance (Ideal BMI-Current BMI) (F-value=18.794, p<0.0001) in women, but there were not significant in men (F-value=2.028, p>0.05). In estimate on state-trait anxiety inventory according to quartile of BMI distance by sex, levels of state-trait anxiety were not significant difference by degree of body dissatisfaction in all sex. In addition, higher distorted body image was significantly increased numbers of weight control method and experience of side effects in female, but there were not showed significant relation between two variables in male.

• 지역사회간호학회지
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• 제15권1호
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• pp.122-131
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• 2004

Purpose: The purpose of the study is to explore the socio-psychological coping process and experiences of families before and after institutionalization by applying the Corbin and Strauss ground research method. Method: Data collection from 9 participants with elderly institutionalized dementia with approval from directors of the institute was done by in depth interviews during a seven month period from May, 2003 to December, 2003. Data analysis was done by repeated reading of the transcribed interviews, and 344 concepts and 39 subcategories were generated. Results: Family members of the dementia elderly experienced various degrees of exhaustion, physically, mentally, and socially. The degree of their exhaustion was related to the severity of the family member's symptoms, and length of the dementia. Coping strategies were effected by economic status, social support from blood related families or neighbors, depth of their relationship with elderly institutionalized dementia. They were even affected by the elderly family members institutionalization. Conclusion: After institutionalization participants felt some guilt from not assuming their responsibilities as children. On the other hand they regained privacy, freedom, security, and comfort, so that their life returned to normal. They even felt more comfort because their elderly were living in a safer environment, and received a better quality of care. Participants had better composure, so that they could even take care of neighbors in need. They hope that there is more governmental involvement in terms of subsidy and numbers of institutes. Findings of the study will be a ground for the development of a coping program for families with elderly institutionalized dementia. Further studies are recommended to explore types of family, and to develop programs for the families to help them interact with each other.