• Journal of the Korean School Mathematics Society
• /
• v.17 no.4
• /
• pp.465-492
• /
• 2014

In this study, through the analysis of the mathematics curriculum and textbooks, we produce the cooperative learning activity sheets which was appropriate instructional content for various levels. And, by using them appropriately at the levels of student learning on their own interest, we enhance academic achievement and cooperative learning attitudes. Specific for details for this study are as follows: First, through the applying a variety of the differentiated cooperative learning activity sheets and developing instruction learning, we improve the academic achievement. Second, through the making and utilizing the differentiated cooperative learning activity sheets and the interest and attitudes in mathematics, we improve the cooperative learning attitude. Third, through the levels of the subgroup cooperative learning, we improve the math learning abilities through a learner-centered. Further the purpose of this study is to bring up complementary cooperative spirit among colleagues.

• Journal of Korea Port Economic Association
• /
• v.31 no.3
• /
• pp.41-60
• /
• 2015

This paper investigates whether managerial ownership and foreign ownership have impacts on firm value, using a sample of logistics firms listed on the Korea Stock Exchange between 2008 and 2014. In the Korean economy, family-controlled business groups, known as chaebol, constitute a unique governance system. To acquire investments from controlling shareholders, a logistics firm is likely to be included in family-controlled business groups. Since reform of the governance structure of logistics firms in the South Korea enables shareholder value to be maximized, we analyzed ownership effects on firm value using pooled ordinary least squares. Empirical results showed that there was a significant positive relation between managerial ownership and firm value. This study also found that there was a significant positive relation between foreign ownership and firm value. We thus show that both managerial ownership and foreign ownership can protect shareholders by positively affecting firm values.

• Journal of Digital Convergence
• /
• v.15 no.3
• /
• pp.365-373
• /
• 2017

This research aims to verify the moderating effect of sports activity satisfaction in the relationship between adolescents' communication skills and positive self-concept within peer group. To achieve this purpose, this study extracted 250 samples from five boys high schools in Gyeonggi-do, and used survey of 232 students for actual analysis excluding the surveys with unfaithful answer or double entry. Questionnaire was used as a tool for collecting data and conducted frequency analysis, correlation analysis and moderator regression analysis to analyze the collected data. This study drew the following results. It was identified that sub-factors of sports activity satisfaction as social, physical, environmental and educational satisfaction have the moderating effect in the relationship between adolescents' communication skills and social self-concept with peer group. In other words, communication skills within adolescents' peer group play an important role in improving positive self-concept, but when sports activity satisfaction put as a moderating variable, adolescents' positive self-concept would be more improved.

• Journal of The Korean Association For Science Education
• /
• v.23 no.1
• /
• pp.57-65
• /
• 2003

In this study, the effects of grouping by extraversion and introversion in paired think-aloud problem solving using a four-stage problem-solving strategy emphasizing planning and checking stages were investigated. Prior to the instructions, the students' extraversion/introversion in three high school classes (N=87) were examined, and those classes were randomly assigned to the homogeneous, the heterogeneous, and the control groups. The test scores of the two treatment groups were significantly higher than those of the control group in the problem-solving ability. However, there were no significant differences in learning difficulty and self-efficacy. Although there were no significant differences between the scores of two treatment groups in the subcategories of the perception of treatment, the test scores of extroverts were significantly higher than those of introverts in the perception of performing listener's role, the preference to problem solving strategy, and the preference to paired think-aloud problem solving.

• Journal of Life Science
• /
• v.16 no.6
• /
• pp.898-903
• /
• 2006

The genetic diversity and population structure of fifteen Potentilla discolor Bunge populations in Korea were determined using genetic variations at 19 allozyme loci. Fourteen of the 19 loci (73.7%) showed detectable polymorphism. Genetic diversity at the species level and at the population level was high ($H_{ES}\;=\;0.215$, $H_{EP}\;=\;0.196$, respectively), whereas the extent of the population divergence was relatively low $(G_{ST}\;=\;0.069)$. Total genetic diversity values $(H_T)$ varied between 0.0 and 0.656, giving an average overall polymorphic loci of 0.292. The interlocus variation of genetic diversity within populations $(H_S)$ was high (0.274). On a per locus basis, the proportion of total genetic variation due to differences among populations $(G_{ST})$ ranged from 0.010 for Pgm-2 to 0.261 for Pgd-2 with a mean of 0.069, indicating that about 6.9% of the total allozyme variation was among populations. Wide geographic ranges, perennial herbaceous nature and the persistence of multiple generations are associated with the high level of genetic variation in P. discolor. The estimate of gene flow based on $G_{ST}$ was high among Korean populations of P. discolor (Nm = 3.36).

• Korean Journal of Medicinal Crop Science
• /
• v.10 no.1
• /
• pp.5-11
• /
• 2002

The study of genetic diversity was carried out in Atractylodes japonica $K_{OIDZ}$. Although this species has been regarded as medically important one, there is no report on population structure in Korea. Starch gel electrophoresis was used to investigate the allozyme variation and genetic structure of eight Korean populations of this species. Of the 15 genetic loci surveyed, nine (60.0%) was polymorphic in at least one population. Genetic diversity was high at the species level $(H_{es}=0.144)$, whereas, that of the population level was relatively low $(H_{ep}=0.128)$. Nearly 87% of the total genetic diversity in A. japonica was apportioned within populations. The sexual reproduction, high fecundity, and perennials are proposed as possible factors contributing to high genetic diversity. The indirect estimated of gene flow based on Gst was 1.69.

• Journal of Life Science
• /
• v.17 no.11
• /
• pp.1477-1481
• /
• 2007

The mating systems of natural populations of Vicia tetrasperm in Korea were determined using allozyme analysis. The result suggests that V. tetrasperm is low rates of outcrossing or mix-mating outcrossing (self-fertilization, s < 0.5). At the population levels, the values of inbreeding coefficient of ten populations in Korea varied from 0.131 to 0.176, giving an average 0.154. For ten natural populations, multi-locus estimates of outcrossing (tm) was 0.333 across fifteen polymorphic loci, with individual population values ranging from 0.269 to 0.423. The differences between the tm and ts values were not close to zero (tm - ts > 0.154), indicating that biparental inbreeding was significant in the loci. The reason for relatively low outcrossing rates of some populations could be attributed to extensive consanguineous mating and isolation of flowering mature plants. Although heterozygote excess was observed in one natural population, most populations exhibited varying degrees of inbreeding and heterozygotes deficit. Thus, selection against homozygotes operated in the progeny populations throughout the life cycle.

• 한국HCI학회:학술대회논문집
• /
• 2007.02b
• /
• pp.720-727
• /
• 2007

이미 많은 연구들을 통해 동질적인 집단에 비해 이질적인 구성원으로 이뤄진 집단이 더욱 창의적이며 상호 보완하여 시너지효과를 발휘한다는 것이 밝혀졌다. 그러나 기존 연구들은 결과에만 초점을 둘 뿐 각 과정과 단계에서 구성원이 겪는 고충과 불 만족감, 사기 저하 등과 같은 실질적으로 집단창의성을 저해하는 요인을 파악하려는 깊이 있는 접근은 미비한 실정이다. 따라서 본 연구는 집단을 이루는 구성원의 특성과 창의성과의 관계에 초점을 두어 개인이 가진 자신만의 독특한 성격 (Personality)이 집단에서 다른 구성원들과 만났을 때 어떠한 효과 또는 반용을 보이는가를 관찰하여 집단 내에서 개인이 가진 성격적 특성이 창의적인 시너지효과를 증대시킬 수 있는 창의적 집단 모델을 구성하고자 했다. 집단 구성원의 성격적 특질을 알아보기 위해 MBTI를 사용하였고 MBTI의 기질별 특성이 집단 창의성에 미치는 영향을 살며보고자 했던 본 연구 결과, 집단 창의성과 MBTI의 관계는 실제로 MBTI의 성향에 따라 다르게 나타남을 알 수 있었다. 각 성향별로 지난 장정을 적절히 조합했을 때에 집단은 집단을 이루는 구성원들에 의해 발전적인 방향으로 나아감을 알 수 있었는데, 이는 무작위로 구성된 집단이 각 개인의 능력을 저하시키는 가장 큰 요인임을 보여주는 것이라 할 수 있다.

• The Korean Journal of Elementary Counseling
• /
• v.10 no.2
• /
• pp.151-165
• /
• 2011

This study aims to demonstrate how well SCM analysis, which indicates social cognitive map of categorizing peer subgroups of elementary school students, corresponds with that of teachers. To do this, the subject of this study includes two classes of the 3rd and the 5th grade students in D elementary school in B-gu, Busan city. Over 30 students of each gender in each grade were surveyed with social network questionnaires to collect data. The result of the social network survey was analyzed by SCM 4.0 program to categorize peer subgroups within each class. The categorized peer subgroups were reported to the class teacher. Based on the report, the class teachers observed peer subgroups in classes. After the teachers observed and categorized the students into several peer groups, an analysis was conducted to compare the peer subgrouping by students with that by teachers. The result showed the two were 80% correspondent to each other regardless of gender and grade. If interobserver reliability stays within the range of 80-100%, it is considered reliable. And this leads to the conclusion that peer subgrouping by students' cognition and that by teachers' observation can be regarded quite corresponding. In conclusion, peer subgrouping through SCM is significant when peer subgrouping Korean children, and it appears to be more significant when analyzed considering different variables including gender and grade. Peer subgrouping by girls is shown to be more accurate than that by boys.

• Proceedings of the Korean Information Science Society Conference
• /
• 2011.06c
• /
• pp.347-350
• /
• 2011

감시카메라 환경에서의 비정상 집단행동 탐지란 감시카메라로부터 유입되는 영상에서 다중 객체가 위험에 처한 상황을 신속하고 정확하게 탐지 및 인식하는 분야를 말한다. 본 논문에서는 CCTV 등과 같은 감시카메라 환경에서 움직임 벡터와 SVDD를 이용하여 집단내의 비정상 상황을 탐지하는 프로토타입 시스템을 제안한다. 제안된 시스템은 움직임 벡터를 이용하여 영상내의 움직임 정보를 추출 표현하였으며, 비정상 집단행동의 판별 문제를 실용적 차원의 단일 클래스 분류 문제로 재해석하여 단일 클래스 SVM의 대표적 모델인 SVDD를 탐지자로 설계하였다. 공개적으로 사용 가능한 벤치마크 데이터 셋인 PETS 2009와 UMN을 이용하여 본 논문에서 제안한 비정상 집단행동 탐지 시스템의 성능을 실험적으로 검증한다.