• 제목/요약/키워드: Difference-in-differences analysis

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Gender Differences in the Factors Affecting Elementary School Students' Ability to Identify Scientific Problems (초등학교 아동의 과학적 문제 발견 능력에 영향을 미치는 관련 변인에서의 남녀 차이)

  • Lee, Hye-Joo
    • Journal of Korean Elementary Science Education
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    • v.25 no.4
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    • pp.419-429
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    • 2006
  • This study investigated gender differences in the factors affecting elementary school students' ability to identify scientific problems. Scientific problem finding tasks, involving written instruments including IQ tests, content knowledge, science process skills, divergent thinking skills, intrinsic/extrinsic motivation, personality traits, and home environment were administered to 96 elementary school students(male; 50 & female: 46). The data collected was analyzed by means of a t-test, Pearson's correlation, multiple regression analysis, and canonical correlation analysis. The finding indicated that there were significant gender differences in scientific problem finding performance. Female students were significantly higher in both total score and elaborate score of scientific problem finding than male students. Personality traits and intrinsic motivation positively and extrinsic motivation negatively predicted male students' abilities in scientific problem finding. Science process skills, personality traits and intrinsic motivation positively and extrinsic motivation negatively predicted female students' scientific problem finding and IQ positively predicted female students' elaborate score of scientific problem finding.

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A Numerical Taxonomic Study of Calystegia in Korea by the Cluster Analysis and Principal Component Analysis (류집분석과 주성분분석에 의한 한국산 메꽃과의 수량분류학적 연구)

  • Kim, Yun Shik
    • Journal of Plant Biology
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    • v.27 no.1
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    • pp.33-41
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    • 1984
  • The relationships and character variations on 5 taxa of Calystegia were examined by sluster analysis and principal component analysis. Thirteen Calystegia population samples from the middle part of Korea were observed. Although minor differences were noted, essentially similar results were obtained from the phenograms by UPGMA, UPGMC and Ward's clustering methods, and these results were in accordance with those obtained from the ordination plots by principal component analysis. C. soldanella is distantly connected with the other taxa mainly because of its morphologically different leaf organs. Based on the difference on the first principal component, C. hederacae is kept apart from the rest 3 taxa. In the relationships among C. japonica, C. sepium var. americana and C. davurica, mivor differences were obtained from the 3 clustering methods. As to the character variations among different populations within a taxon, they are slight in C. soldanella and C. sepium var. americana, but remarkable in C. hederacae and C. davurica.

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Comparison of Ranges of Motion in The Thoracolumbar Region for Clinical Diagnoses of Patients with Chronic Low Back Pain (만성요통 환자의 질환명에 따른 흉요추부의 관절가동범위 비교)

  • Lee, Sang-Wook;Kim, Suhn-Yeop
    • Journal of the Korean Society of Physical Medicine
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    • v.5 no.3
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    • pp.363-373
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    • 2010
  • Purpose : The purpose of this study was to compare differences in thoracolumbar ranges of motions by comparing ratios among 4 type diagnosis for patient with chronic low back pain. Methods : The subjects were 58 chronic low back pain patients. A motion analysis program (Global Postural System) was used after photography for posture measurement. To analyze differences in mobility percentages and ratios of thoracolumbar ranges of motion, one-way ANOVA was used. Results : Regional difference spinal posture and movement were found to diagnosis patients with chronic low back pain. Comparison of thoracolumbar ranges of motion revealed significant differences in the thoracic region during forward-bending of the trunk (p<.05). In the upper thoracic region, the herniated intervertebral lumbar disc (HILD) group was significantly larger than the spinal stenosis/herniated intervertebral lumbar disc (SS/HILD) group (p<.05). In the lower thoracic region, chronic sprains (CS) were significantly greater than in the spinal stenosis (SS) group and in the (SS/HJLD) group (p<.05). Comparative analysis of thoracic/lumbar mobility ratio showed the CS group's ratio during forward bending was largest: 1.66, while the HILD group's ratio was smallest: 84 a significant difference between the two groups (p<.01). Diagnosis was not associated with difference in thoracolumbar backward-bending range of motion (p>.05). Conclusion : Theses results indicate the clinical efficacy of diagnosing for chronic low back pain by evaluating spinal mobility.

A Study on the Attitude and the Actual Condition between Housewives and Woman University Students about Furniture Usage and Living Room (거실공간과 가구사용에 대한 주부와 여대생의 의식 및 실태)

  • 임소연
    • Journal of the Korean Home Economics Association
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    • v.33 no.4
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    • pp.289-300
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    • 1995
  • The purpose of this study was to suggest usage that all family members could find satisfaction in the way to use furniture and living room. First of all, methods of research for this purpose were to grip on the points of difference and sameness on the attitude and the actual condition about furniture usage and living room between housewives and woman university students. To make analysis the data, frequency, $\chi$2-test, t-test, F-test and factor analysis were used. The major results are as follows ; 1. There were significant differences in the using time, time zone and life behavior in living room. 2. In furniture usage, housewives and woman university students have significant differences. 3. According to the results of making investigation into degree of satisfaction abut furniture and living room usage, housewives and woman university students have significant differences.

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Design and Characterization of 3 dB Branch Type Directional Couplers using High-Tc Superconductors (고온초전도체를 이용한 가지 형태 3 dB 방향성 결합기 설계 및 특성해석)

  • Chung, Dong-Chul;Choi, Myoung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.1
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    • pp.116-119
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    • 2010
  • In this work, we presented the characterization of 3 dB branch type directional couplers by using High-Tc superconducting thin films. To do this, we deposited YBCO superconducting thin films on MgO substrates by using rf-magnetron sputtering techniques. The designed center frequency was 408 MHz and the designed passband was 20 MHz. Also we designed 3 dB Power difference and $90^{\circ}$ of phase difference between port 3 and port 4. The even and odd mode analysis were used to characterize our directional couplers and em Sonnet (full wave analysis program) was utilized to the optimum design. We reported experimental results, including a center frequency, passband, half power characteristics and phase differences. We confirmed that experimental results were in good agreements with characterization by using full wave analysis program.

The Effects of Proprioceptor Training and Vestibular Organ Training on Balance Ability of Adults

  • Lee, Sang Bin;Moon, Ok Kon;Choi, Jung Hyun;An, Ho Jung;Shin, Hee Joon;Kim, Nyeon Jun;Park, Si Eun;Song, Young Hwa;Min, Kyung Ok
    • Journal of International Academy of Physical Therapy Research
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    • v.5 no.1
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    • pp.668-674
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    • 2014
  • The purpose of this study was to analysis of the effect of proprioceptor training and vestibular organ training for balance ability. The subjects was consist of two different subjects group, proprioceptor training group and vestibular organ training group. Proprioceptor training group consisted of 10 subjects and vestibular organ training group consisted of 10 subjects. Training was performed 3 times per week, 30 minutes per day, for 3 weeks. Balance ability analysis was performed using Romberg's one leg standing test and BT4 when opened eyes and closed eyes. The analysis results were as follows. There was no significant differences in balance after the training in both groups when they opened their eyes(p<.05). But there was significant differences in balance after the training in both groups when they closed their eyes(p<.05). And there was no significant difference in balance after the training between the proprioceptor training group and the vestibular organ training group when they closed their eyes(p<.05). Given the above results, proprioceptor training and vestibular organ training enhanced balance but there was no significant difference between the two methods.

Kinematical Analysis of Projection Factors to Record Difference dur ing Women's Javelin Throwing (여자 창던지기 시 기록 차이에 따른 투사요인의 운동학적 분석)

  • Park, Jae-Myoung;Yoon, Seok-Hoon
    • Korean Journal of Applied Biomechanics
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    • v.20 no.4
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    • pp.457-467
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    • 2010
  • This study intends to analyze the projection factors' difference on each record of women's javelin throwing. For this purpose, the research analyzed the best record and the lowest one of athletes in top 1~7 ranks respectively, who participated in 2009 Daegu Pre-Championship Meeting. For analyze kinematic factors, we analyzed their game photos mainly shot by 3 cameras installed in side places. The used analysis program was Kwon3D 3.1. Analysis variables were the projection velocity, angle, height, trunk lean angle, and supporting leg's knee angle. The results concluded as follows: Different record showed statistically significant differences(p<.05) in terms of horizontal velocity and resultant velocity. There were no statistically significant differences in the variables of projection angle, its height, trunk lean angle and knee angle of support leg. But for the analyzed results to each individual characteristics, the horizontal velocity, projection height, knee angle of support leg and trunk lean angle of release event appeared to have influence on record.

A pilot study on job satisfaction of korean medical clinic workers (한의원 종사자들의 직무만족도에 관한 예비연구)

  • Lee, Jeong Won;Kim, Gyeong Cheol
    • Korea Journal of Hospital Management
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    • v.17 no.4
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    • pp.1-20
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    • 2012
  • The purpose of this study is to find out the job satisfaction of the korean medical clinic workers, and understand the factors that affect the satisfaction thereby increasing the efficiency of human resource management and providing the basic data to establish the management strategy. We visited 50 korean medical clinics which were chosen randomly from the korean medical clinics in the city of Changwon, Gyungnam. First, we explained the purpose of the study and survey contents to the surveyees, then distributed the Questionnaire and collected them. The data analysis was done statistically using the SPSS WIN IBM 20.0 program. The results were as follows: Professional career, interpersonal relationship, work autonomy, and overall job satisfaction showed significant differences depending on ages. While satisfaction of interpersonal relationship showed significant difference depending on final education. Depending on marriage status, while married persons showed significantly high satisfaction on professional career, interpersonal relationship, work autonomy, administration, and overall job satisfaction, there is no significant difference on income satisfaction. The number of years worked in the current clinic showed significant difference on administration satisfaction. Also, daytime working hours showed significant difference on administration and overall job satisfaction. The work area showed significant difference on overall job satisfaction. The income level showed significant differences on professional career, administration, and overall job satisfaction. From this study, it was confirmed that demographic characteristics and work environment factors showed significant differences on overall job satisfaction of workers in korean medical clinics. Therefore, in order to facilitate efficient manpower utilization and organization efficiency maximization, and motivation of human resources, a detailed plan should be developed to improve working environment and take demographic characteristics into consideration.

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Public-Private Partnerships in International Development Cooperation: Avoiding the Pitfalls to Make a Difference

  • Lussier, Dr Kattie
    • International conference on construction engineering and project management
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    • 2015.10a
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    • pp.30-31
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    • 2015
  • PPPs in international development cooperation can be challenging due limited capacities in the country, weaknesses in terms of policy and legislative frameworks, differences in mindsets, values, work ethics and hierarchical structures as well as cultural issues. These can lead to misunderstandings and implementation problems. However, a careful assessment of the situation on the ground, stakeholder analysis and needs assessment can help to identify potential bottlenecks and address capacity constraints that could slowdown operations. A sound understanding of local power dynamics and work practices can help to put in place an exit strategy which will enhance the projects' sustainability. Making sure that goals and objectives are understood in the same way by all partners, establishing an ongoing and respectful dialogue between them, as well as transparent implementation and monitoring mechanisms can also contribute to the PPP's success and increase the likeliness to make a difference in the lives of those in needs.

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A Study on the Effect of Internet Advertising by Product Involvement Levels, Website Types and Banner Advertisement Types (제품관여도, 웹사이트 유형 및 배너광고 유형에 따른 인터넷 광고효과에 관한 연구)

  • Kim, Jong-Woo;Lee, Seung-Youp
    • Journal of Global Scholars of Marketing Science
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    • v.7
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    • pp.105-125
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    • 2001
  • A rapid in increase in population of Internet users made the Internet appeared to be an important advertising medium. Under this situation, one of important research issues will be one related to measurement of Internet advertising effect. This study was carried out with three following projects which set up on the basis of the Modified Elaboration Likelihood Model of Cho(1999). (1) Analysis of differences in banner click, advertising attitude and buying intention according to the product involvement levels. (2) Analysis of differences in banner click, advertising attitude and buying intention according to the product involvement levels and website types. (3) Analysis of differences in banner click, advertising attitude and buying intention according to the product involvement levels and banner advertisement types. The experiment was conducted in a manner that virtual websites and banner advertisements produced for the purpose of this study were classified into eight groups according to the product involvement levels, website types and banner advertisement, and then questionnaire sheets were filled out. The results of empirical analysis are summarized by the research projects as follows. (1) The banner click, advertising attitude and buying intention according to the product involvement levels were not significant. (2) There was no significant difference in the banner click according to the product involvement levels and website types. In the advertising attitude, there was a significant effect of interaction, whereas in the buying intention there was no significant effect of interaction. (3) There was a significant difference in the banner click by the product involvement levels and banner advertisement types. Concretely the click rate appeared to be high in literal banner advertisement for a product with high involvement and in pictorial banner advertisement for a product with low involvement. It is expected that this study can provide Internet advertising researchers and managers with theoretical and the practical informations.

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