• The Korean Journal of Applied Statistics
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• v.33 no.3
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• pp.347-355
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• 2020

An Isolation-with-Migration (IM) model is used to estimate extant population sizes, the splitting time of populations split away from their common ancestral populations, and migration rates between the extant populations. An evolutionary model such as IM models is estimated by analyzing DNA sequences sampled from the extant populations in the model. When a true model includes an unsampled 'ghost' population without data, the unsampled population is often ignored from the evolutionary model to infer. In this paper, we conduct a simulation study to investigate the effect of an unsampled population on the estimation of the size of the sampled population. When there exists an unsampled population that shares migrations with the sampled population, the size estimation of the sampled population was biased. However, the size estimation was improved if an evolutionary model, including the unsampled population, was estimated.

• 월간 기계설비
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• s.60
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• pp.72-78
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• 1995

• Journal of the Korea Convergence Society
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• v.8 no.7
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• pp.349-356
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• 2017

The purpose of this study is to provide guidelines for effective osteoarthritis passive aquatic rehabilitation program and form of exercise prescription through passive aquatic rehabilitation exercise for 24 weeks for women with osteoarthritis. The subjects of this study were the passive aquatic rehabilitation group (CG, n = 10) and the control group (AREG, n = 10) among the subjects who had been diagnosed with osteoarthritis by the K orthopedic surgeon and visited the hospital more than 3 times were selected. The results of this study showed that the change of shoulder height in the group was significantly different in passive aquatic rehabilitation exercise group (p <.001). There were significant differences in passive aquatic rehabilitation exercise group (p <.001) between the groups with inhaled sacpula patterns. Changes in the pelvis patterns inferior pattern of the left and right pelvis patterns in the group were significantly different in passive aquatic rehabilitation exercise group (p <.001).

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.9
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• pp.4227-4239
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• 2013

Knowledge transfer occurs in various social contexts, within individuals and groups, and, thus, is closely linked to social networks in an organization. This paper applies social network theory and social identity theory to knowledge management area. The subject of this study was organization members who transfer their knowledge. 296 questionnaires were collected and analyzed. The results are as follows. First, in-group and out-group's tie strength have a significant effect on knowledge transfer. Second, the study shows that the knowledge transfer influences positively individual, team and organizational performance. Lastly, the study verifies that the applied knowledge has a moderating effect on the relationship of the in-group's tie strength and knowledge transfer.

• The Journal of the Korea Contents Association
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• v.9 no.9
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• pp.218-225
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• 2009

The present research aims to analyze empirically the effect of group cohesiveness and supervisor trust which tax investigators recognize while performing tax administrative duties on the team commitment and in-role behavior. The result of the analysis showed that tax investigators' higher group cohesiveness and supervisor trust resulted in higher team commitment, and that higher team commitment in turn resulted in higher in-role behavior, thereby raising the efficiency of tax investigators' activities as well as tax payers' satisfaction with tax services. Therefore in order to improve the efficiency of tax organizations and team performance, the managers of the organizations must set solid goals, develop solid strategies appropriate for situation, and make proper compensations for investigators' achievements. In addition, there would have to be an organic improvement In all the relevant areas, including organization, personnel management, work style, compensation and welfare, in order to raise tax investigators' work desire.

• Journal of Korean Society of Forest Science
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• v.94 no.6
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• pp.397-401
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• 2005

Homoharringtonine isolated from the plumyew tree (Cephalotaxus koreana) is currently considered as one of the most promising chemotherapeutic agents for anti-cancer. Variation of homoharringonine contents from eight natural populations of Korean native plumyew trees was determined by HPLC (high performance liquid chromatography), and compared with the variation among populations, the variation of the different parts(needle, root, stem and seed), and the variation according to their ages and growth features. Homoharringonine contents among populations were significantly different with Mt. South Dukyu ($1,048{\mu}g/g$) having the highest and Mt. Obong having the lowest. The analyses of plant pans showed that the homoharringtonine contents were highest in plant needles ($874{\mu}g/g$), and followed by roots, stems and seeds. Homoharringtonine contents of the plumyew trees decreased about 30% in increment with their ages and growth.

• Korean Journal of Psychosomatic Medicine
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• v.27 no.2
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• pp.119-129
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• 2019

Objectives : The purpose of this study was to examine cognitive and psychological characteristics of patients who visited psychiatric outpatient clinic with military service suitability issues. Methods : Since January, 2017 to September, 2018, patients were recruited from the department of psychiatry of university hospital. Participants were diagnosed using DSM-5 criteria by board certified psychiatrists. And each of participants tested with K-WAIS-IV, K-SCL-95 by clinical psychologist. The data were analyzed using SPSS 18.0. Results : The results indicated 24.6% of the patients have significantly low level of intellectual functioning. and 10.8% of the patients have borderline level of intellectual functioning, and 26.3% of them were below average. The results of psychological characteristics showed patients have cautious and potentially dangerous level of depression, anxiety, agoraphobia, and suicidal idea. And PTSD subscale's mean score was above problematic level. Next, we divided patients into two groups based on question of whether the patient is eligible to serve in the military service or not arises from recruitment process or army training center. But two group didn't differ significantly. And for further analyses, we also divided patients into two groups based on if they got single psychiatric diagnosis or more than one psychiatric diagnosis. Conclusions : The results indicated that group which has coexisting psychiatric disorders were more depressed, had higher level of anger and aggression, and had more serious levels of suicidal ideas than single psychiatric diagnosis group. The implications and limitations were discussed along with some suggestions for the future studies.

• Journal of Korean Society of Forest Science
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• v.69 no.1
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• pp.69-75
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• 1985

These studies were carried out to know the variation of foliar characteristics of Camellia japonica distributed in Korea. The results are summarized as follows; 1) The values such as leaf length, leaf width, and leaf area were the most highest in Chukdo population, while the lowest in Chejudo population. 2) The values of Wando population showed the most highest in leaf serration characters, while the values of Kochang population the lowest. 3) In the number of cort warts, the values of Chundo population showed the most highest, while Dodcong population the lowest.

• Korea journal of population studies
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• v.34 no.1
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• pp.99-127
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• 2011

This study examines whether educational differentials in health are greater in more recent cohorts in Korea. This study utilizes latent growth-curve modeling to examine intercohort trends in health for three educational subgroups, using panel data (2003-2007) based on a national probability sample of 9,639 adults. Among young and middle adults with less than a high school diploma, the 4-year newer cohort demonstrated better health at the same age, implying a favorable trend. Middle and older adults with college level and a high school diploma also enjoyed favorable trends in health. This study suggests the possibility that the education-based overall disparity in health is increasing, but there are variations in the trend depending on age group. The increasing disparity mainly occurred among older adults.

• Korean Journal of Plant Resources
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• v.26 no.2
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• pp.310-319
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• 2013

The genetic diversity and structure of eight populations of Coreanomecon hylomeconoides Nakai, an endemic Korean plant, were investigated using 50 ISSR loci from eight primers. The average percentage of polymorphic loci was 47.3%. The Shannon's index (SI=0.218) and gene diversity (h=0.142) were relatively lower than those of other long-lived perennials. The Sancheong (SI=0.233, h=0153), Gwangyang (SI=0.263, h=0.171), and Suncheon (SI=0.241, h=0.159) populations showed greater genetic diversity than the Namhae and Gwangju populations, which are on the edge of the distribution. Analysis of molecular variance (AMOVA) showed that 18% of the total variation could be attributed to differences among populations, and 82% to differences within populations, indicating moderate gene flow among adjacent populations. These results were supported by value of Nm (2.184). The UPGMA conducted using the genetic distance and Bayesian cluster analysis showed a remarkable geographic trend structured into east and west regions. Overall, the results indicate that the Sancheong and Gwangyang populations, which had a large population size and higher degree of genetic diversity, should be the focus of in situ conservation.