• 한국응용과학기술학회지
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• 제36권3호
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• pp.813-820
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• 2019

Oleic acid의 분자분절 운동에 대한 cholesterol 유도체들의 영향을 보다 잘 이해하기 위해 소량의 첨가물들이 포함된 oleic acid 시료에 대해 밀도, 점성도, IR, $^1H$ NMR, self-diffusion coefficient를 측정하였다. 이 측정을 통하여 cholesterol, cholestanol, cholestane, cholesteryl oleate, benzene, ethanol 등의 첨가물이 포함된 oleic acid 시료에 이들의 효과가 어떻게 나타나는지 알 수 있었다. OH기와 하나의 이중결합을 갖고 있는 cholesterol은 oleic acid의 점성도는 크게 증가시켰으나, 자체 확산계수, 분자내 운동은 감소시켰다. 다른 첨가물들을 시험한 결과 OH기의 유무, 이중결합의 정도에 따라 영향이 변화하였다. 벤젠과 에탄올의 경우 점성도는 감소하였으나 자체 확산계수와 분자내 운동은 증가하는 현상를 보여주었다. 이들 실험을 바탕으로 oleic acid는 에탄올 뿐 아니라 cholesterol과도 착물을 형성하고 또 착물이 이뤄지는 메카니즘에 대해서도 이해할 수 있었다. 이들 착물 형성과 oleic acid 이합체로 이루어진 집합체의 성질 조사를 바탕으로 oleic acid의 분자분절 운동에 대한 cholesterol의 영향을 알 수 있었다.

• Animal Bioscience
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• 제36권10호
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• pp.1508-1516
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• 2023

Objective: To carry out a comprehensive production planning of the existing Rongchang pig population from both environmental and genetic aspects, and to establish a closed population with stable genetic diversity and strict pathogen control, it is necessary to fully understand the genetic background of the population. Methods: We genotyped 54 specific pathogen free (SPF) Rongchang pigs using the Zhongxin-1 Porcine Breeding Array PLUS, calculated their genetic diversity parameters and constructed their families. In addition, we also counted the runs of homozygosity (ROH) of each individual and calculated the value of inbreeding coefficient based on ROH for each individual. Results: Firstly, the results of genetic diversity analysis showed that the effective population size (N_e) of this population was 3.2, proportion of polymorphic markers (P_N) was 0.515, desired heterozygosity (H_e) and observed heterozygosity (H_o) were 0.315 and 0.335. H_o was higher than H_e, indicating that the heterozygosity of all the selected loci was high. Secondly, combining the results of genomic relatedness analysis and cluster analysis, it was found that the existing Rongchang pig population could be divided into four families. Finally, we also counted the ROH of each individual and calculated the inbreeding coefficient value accordingly, whose mean value was 0.09. Conclusion: Due to the limitation of population size and other factors, the genetic diversity of this Rongchang pig population is low. The results of this study can provide basic data to support the development of Rongchang pig breeding program, the establishment of SPF Rongchang pig closed herd and its experimental utilization.

• 한국응용곤충학회지
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• 제37권1호
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• pp.31-37
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• 1998

연초에 채집하여 Blackman(1987)의 기주선호성과 형태적인 특징을 이용하여 분류한 방법에 의해 두가지 타입을 (M. persicae Sulzer와 M. nicotianae Blackman)으로 구분된 무시성충 복숭아 혹진딧물 8 클론의 유전적 특성을 분석을 위하여 RAPD-PCR방법을 이용하였다. 사용된 random primer(10-mer) 100개 중에서 20개의 primer을 선발하였는데 GC content가 70, 80, 90%인 primer에서 각각 26.9%, 50.5% 및 66.^%로 GC content가 높아질수록 PCR결과 band의 양상이 좋게 나타났다. simple matching coefficient를 구하여 matrix를 작성해 본 결과 유사계수(similarity coefficient)의 범위는 0.414~0.808사이이었다. 복숭아혹진딧물 clone 간에 유사계수가 가장 높은 것은 PG2와 PG3 클론으로 0.808로 나타났으며, DBR클론을 기준으로 하여 볼 때 PG2 클론간의 유사계수를 0.414로 유사도가 가장 낮았다. 유사계수를 이용하여 8가지 클론의 진딧물들에 대한 유전적 근연관RP를 살펴보면 M. persicae typer에 속하는 PG1, PG2, PG3 클론들과 M. nicotianae type에 속하는 RED 클론이 유사도 0.643에서 한그룹, M. nicotianae type에 속하는 GR1, GR2, BRN크론들이 유사도 0.636에서 유연관계가 있었으며 그리고 M. persicae type에 the하는 DBR클론 등 세 개의 그룹으로 구분되었다. 따라서 연초에서 발생한 복숭아혹진딧물 형태형 2종 (M. persicae와 M. nicotianae)에 대하여 RAPD 기법을 이용하여 분석해본 결과 뚜렷한 유전적 유연관계는 발견하지 못하였다.

• 환경영향평가
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• 제24권2호
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• pp.111-118
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• 2015

본 연구는 서울의 오존 장기변동 특성을 대표하는 대표측정소를 선정하기 위한 통계적인 기법을 구축하기 위하여 수행되었다. 2002년부터 2011년까지 10년간의 오존 시간 농도자료를 분석에 적용하였다. KZ 필터, 상관관계 매트릭스, 군집분석, 공간 분석 방법을 적용하여 대표측정소를 선정하였다. 상관관계 분석 결과 서울 신정동, 사당동, 번동 측정소의 오존 장기간 변동 추세가 높은 상관관계를 나타내었다. 군집분석에서도 세 측정소가 같은 군집으로 분석되었다. 공간분석 결과, 세 측정소가 다른 측정소와 공간적인 상관관계가 높게 나타났다. 이러한 분석결과와 상관계수값을 고려하였을 때, 신정동 측정소가 서울의 오존 장기변동 추세를 대표하는 측정소로 적합하였다. 본 연구 결과는 오존 이외의 대기오염물질의 분석을 위한 대표측정소 선정에도 적용될 수 있으며, 국가대기측정망의 공간적인 분포의 적절성을 평가하기 위해서도 사용될 수 있을 것으로 판단된다.

• 가정과삶의질연구
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• 제11권2호
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• pp.96-110
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• 1993

The purpose of this study also suggests the direction for the improvement of the quality of family life because the homemaker's health sate affects a successful home management and a satisfactory family life. This study is based on a review of relevent lifevatures by using a research model consits of the independent variables the mediating variables and the dependent variables. The samples were selected by cluster in Seoul Korea. The 700 questionaries were distributed to homemakers who have at least one child with their spouses. Finally the 520 data were analyzed by cronbach's coefficient factory analysis frequency percentage oneway ANOVA correlation regression analysis and path analysis. Consequentyly the findings of this study were accepted hypothesis I. II. III. IV.

• Bulletin of the Korean Chemical Society
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• 제26권12호
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• pp.1953-1961
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• 2005

We have performed high-level quantum mechanical calculation for multiple proton transfer in HOCl + HCl and $H_2O$ + $ClONO_2$ on water clusters, which can be used as a model of the reactions on ice surface in stratospheric clouds. Multiple proton transfer on ice surface plays crucial role in these reactions. The structures of the clusters with 0-3 water molecules and the transition state structures for the multiple proton transfer have been calculated. The energies and barrier heights of the proton transfer were calculated at various levels of theory including multi-coefficient correlated quantum mechanical methods (MCCM) that have recently been developed. The transition state structures and the predicted reaction mechanism depend very much on the level of theory. In particular, the HF level can not correctly predict the TS structure and barrier heights, so the electron correlation should be considered appropriately.

• 한국과학교육학회지
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• 제15권2호
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• pp.194-200
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• 1995

The purpose of this study is to investigate the attitudes related to the science of elementary and middle school students. The instrument used for measuring attitudes was developed by Korea National University of Education. 1488 students were sampled by stratified cluster sampling method. The major findings of this study are as follows. 1.Elementary school students have significantly higher attitude scores than middle school students. 2.The value of Pearson's correlation coefficient among the sub-categories of science attitudes was 0.3773 - 0.6336, which was significant at the 0.001 level. 3.There was no statistically significant difference between grade and sex in middle school students. 4.There was statistically significant difference between grade and sex in elementary school students.

• Communications for Statistical Applications and Methods
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• 제13권3호
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• pp.719-732
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• 2006

A set of clustering algorithms with proper weight on the formulation of distance which extend to mixed numeric and multiple binary values is presented. A simple matching and Jaccard coefficients are used to measure similarity between objects for multiple binary attributes. Similarities are converted to dissimilarities between i th and j th objects. The performance of clustering algorithms with balancing weight on different similarity measures is demonstrated. Our experiments show that clustering algorithms with application of proper weight give competitive recovery level when a set of data with mixed numeric and multiple binary attributes is clustered.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2003년도 The Fifth Asian Computational Fluid Dynamics Conference
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• pp.9-11
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• 2003

A homogeneous flow field including more than 2000 spherical particles was directly simulated. Particles are settling by gravity with the Reynolds number ranging from 50 to 300, based on diameter and slip velocity. Particular attention was focused on the distribution of particles. The Reynolds-number dependence, influences of particle rotation and loading ratio, and the dynamics of particle clusters are discussed. In the higher Reynolds number case, the wake attraction causes particle clusters and the average drag coefficient decreases significantly. Non-rotating particles maintain cluster structure and rotating ones moves randomly in the horizontal direction. It is because of the difference in the direction of the lift force.

• 대한수학회보
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• 제33권1호
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• pp.1-16
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• 1996

Earlier in 1935[12], M. S. Robertson introduced the class of quadrant preserving functions. More precisely, let Q be the class of all functions f(z) analytic in the unit disk $D = {z : $\mid$z$\mid$ < 1}$ such that f(0) = 0, f'(0) = 1, and the range f(z) is in the j-th quadrant whenever z is in the j-th quadrant of D, j = 1,2,3,4. This class Q contains the subclass of normalized, odd univalent functions which have real coefficients. On the other hand, this class Q is contained in the class T of odd typically real functions which was introduced by W. Rogosinski [13]. Clearly, if $f \in Q$, then f(z) is real when z is real and therefore the coefficients of f are all real. Recently, it was observed by Y. Abu-Muhanna and T. H. MacGregor [1] that any function $f \in Q$ is odd. Instead of functions "preserving quadrants", the authors [1] have introduced the notion of "preserving sectors".