• Restorative Dentistry and Endodontics
• /
• v.30 no.5
• /
• pp.402-408
• /
• 2005

The purpose of this study was to investigate the effects of estrogen deficiency on pulpodentinal complex of tooth in ovariectomized rats. Thirty female Sprague-Dawley rats, 10 weeks old, were used. Rats were grouped into two groups. One group (n = 15) was subjected to sham surgery (SHAM) and the other group (n = 15) was ovariectomized bilaterally (OVX). Animals were sacrificed 12 weeks later, and their mandibular molars and associated periodontal supporting tissues were dissected out, and fixed in $10\%$ buffered formalin. For comparison of groups, immunostained for osteonectin. Histomorphometrical measurement of change of teeth was performed using an image analysis system and paired t-test was used and the level of significance for overall differences was set at p < 0.05. In immunostaining of osteonectin, they were significantly different from each other. The predentin thickness in OVX rats was wider than in SHAM rats. And in SHAM rats, osteonectin was more specifically stained in predentin areas than in OVX rats. These results indicate that estrogen deficiency increased the unmineralized predentin areas and decreased osteonectin content in pulpal tissues in rats. If our result is applicable to human studies, odotoblast is affected by estrogen deficiency.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2009.05a
• /
• pp.1476-1481
• /
• 2009

최근 기상이변과 국지성 호우로 인한 홍수피해를 경감하기 위해 국가차원과 더불어 지역단위의 홍수방어대책이 많은 사업을 통해 제시되고 있다. 대표적인 예로 풍수해저감종합계획과 하천기본계획 등을 들 수 있는데 이러한 사업들은 실제 피해지역에 대한 원인과 대책을 제시함과 동시에 홍수 등의 피해가 예상되는 위험지역에 대해서도 그 원인과 대책을 제시해야한다. 따라서 피해발생이 예상되는 지역을 예측하고 그 원인을 찾는데 있어 최근 홍수범람해석에 대한 필요성이 점차적으로 증대되면서 다양한 해석모형과 프로그램들이 개발되었고 현재까지도 홍수범람분석에 관한 활발한 연구들이 이루어지고 있다. 그러나 홍수범람구역을 결정하기 위한 과정은 GIS Tool에 대한 이해도 부족, 원 자료의 부족, 지형 구축을 위한 자료생성의 어려움 등과 같은 다양한 문제점들을 내포하고 있다. 특히, 홍수범람구역의 결정을 위한 전산프로 그램의 기능향상은 점차 향상되는데 비해 지형구축 등과 같은 범람해석 프로세스 내에서 상당한 수작업이 요구되는 바 작업소요시간이 많이 요구되는 단점으로 인해 실무자들에게 널리 적용되는데 있어 걸림돌이 되고 있는 실정이다. 따라서 본 연구에서는 실무적 관점에서 홍수범람해석의 요구빈도가 높은 중소규모 자연하천을 대상으로 두가지 해석 기법을 통하여 홍수범람해석을 수행하여 해석 과정 및 결과 등을 비교하였다. 첫 번째 기법으로 홍수범람해석을 수행하는데 있어 실용성, 신속성 등이 고려된다고 판단되는 Civil 3D를 이용하여 수치지형도 및 측량자료와 같은 원 자료로부터 3D 지형을 구축하고 Civil 3D의 Extension 프로그램인 HEC-RAS Tool과 1차원 수리모형인 HEC-RAS를 전 후처리에 연계함으로서 각 대상유역별, 빈도별 홍수위에 따른 홍수범람구역과 수심 및 범람지역을 우선적으로 분석하였다. 두 번째 기법으로서 실무에서 주로 이용되고 있는 ArcGIS를 이용하여 3D 지형을 구축하고 Hydrologic Engineering Center (HEC)와 Environmental Systems Research Institute(ESRI)의 협력개발로 개발된 HEC-GeoRAS와 HEC-RAS 모형을 전 후처리에 연계하여 홍수범람해석을 수행하였다. 이들 두 가지 기법을 통한 홍수범람해석의 과정과 결과에 대해 정량적, 정성적 비교를 수행하였으며, 두 기법간의 차이점 및 효율성을 제시하였다. 본 연구의 결과는 보다 실용적이면서도 정밀한 홍수범람구역의 결정, 홍수범람 예상도 등의 재해지도 작성, 치수경제성 분석 등에 있어 도움이 될 것으로 판단된다.

• The Journal of the Korea Contents Association
• /
• v.10 no.7
• /
• pp.326-336
• /
• 2010

The purpose of this research is to analysis of difference about university curriculum of secretary from ethnographic research. The research participant 4 years is the university graduate. The participant who is selected is the practical career person of 3 or more years that Works at the Seoul individual enterprise. The specialist verified continuously about research truth and ethical from collection of data and analytical process. The research method and analysis results are as follows : First, Martial art and sports relation subject is more protocol secretary and secretary subject. But emphasized an importance about protocol secretary and secretary subject. Second, The male emphasized that Specialist training and segmentation in major field of study. The woman emphasized that women's studies and protocol secretary, culture of high-level class. Third, They have emphasized difference about private security in professionalism of curriculum.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
• /
• v.6 no.5
• /
• pp.211-218
• /
• 2016

This study focuses on the evaluation on the satisfaction of school education system based on perception levels of students corresponding to school locations. Twenty eight variables concerning with school education system were selected based on literature review and six factors such as reliability, sympathy, student supporting system, teachers' ability, principal physical environments, secondary physical environments were extracted by factor analysis. Satisfaction evaluation was performed by SERVPERP model based on perception level, and differences among respondents as well as school locations were analyzed by t-test and ANOVA. The results said there is no difference on teachers' ability factors. Especially, perception levels of students in rural area were lower than those in urban area except teachers' ability and secondary physical environments factors. Most respondents dissatisfy the school education system and they have no intention to recommend their school facilities (hardware) as well as educational programs (software) to other students in different schools.

• International Area Studies Review
• /
• v.22 no.4
• /
• pp.167-186
• /
• 2018

In this paper try to derive some implications through comparative studies of accelerator in Korea and US centering on accelerator process model. In addition, the concept of accelerator is defined comprehensively through the existing literature study, and the accelerator program is focused on the accelerator process model. In the study, three Korea and America accelerators were selected and analyzed as follows. First, we discussed the definition of the accelerator, the configuration program, and the differences with existing organizations. Second, after selecting three representative companies among Korean and American accelerators, history, programs, achievements, characteristics, and limitations were derived. Third, based on the existing literature research, we compared the differences in appearance and performance between the six Korean and US accelerator companies using the table. Finally, the limitations and implications of domestic accelerators are described.

• Journal of the Korean Geotechnical Society
• /
• v.19 no.5
• /
• pp.233-241
• /
• 2003

Geotextile tube is hydraulically filled with dredged materials and has been applied to coastal protection and scour protection, dewatering method of slurry, and isolation of contaminated material. Recently, geotextile tube technology is no longer alternative construction technique but suitable desired solution. In this paper, the numerical analysis was performed to investigate the behavior of geotextile tube with various properties of geotextile sheet and hydraulic pumping conditions. Numerical analysis was executed to compare with the results from the large-scale field model tests, and also with those of plane strain analysis and 3-D FEM analysis. A geotextile tube was modeled using the commercial finite element analysis program ABAQUS and the one-quarter of tube was modeled. Behavior of geotextile tube during the hydraulic pumping procedure was analyzed by comparing the large-scale field model test and numerical analysis. The shape variation and maximum tube height between the numerical analysis results and large-scale filed test results are turned out to be in a good agreement.

• Culinary science and hospitality research
• /
• v.21 no.4
• /
• pp.271-283
• /
• 2015

The purpose of current study was to find differences of selected attributes and visitors of responses according to their lifestyle as perceived by Pocheon Yidong-BBQ-Galbi Festival participants. Survey method was employed and total 370 data was used for statistical analysis. The results of factor analysis showed that three factors were extracted from lifestyle(Activity, Example, Commonness), and four factors were found from festival selection attribute(Food, Service, Program, Cleanliness). In addition, three clusters(Outgoing personality, Gentle character, Normal character) were extracted from the result of cluster analysis. The result of chi-square shows that selection attributes are significantly different by clusters of festival. Therefore the festival host need to focus on various kinds of BBQ along with diverse foods and activities to make attractive cultual experience festival for visitors who visited with family. Additionally, all selection attributes except clearness have significantly influence on responsive relationship. Thus, the organizer should make an effort to provide high quality of various selection attributes. Current study will be contribute to develop various and fascinating local festival expecially related to food.

• Journal of Korea Technology Innovation Society
• /
• v.21 no.2
• /
• pp.615-635
• /
• 2018

The Korean government has selected job creation policy as first goal in order to overcome the recession and response of 4th industrial revolution. Technology based start up is worth noting in order to job creation. Because the ripple effect of technology based start up is higher than self-employment. Therefore, the government and the private sector conduct various policies and services for the vitalization of technology based start up. In order for technology based start up to be successful, it is necessary to maximize personal (founder) capacity. In this study, the correlation between "features of personal (motivation, capability, experience, entrepreneurship)", "competitiveness of company" and "corporate performance" was analyzed using structural equation modeling (SEM). Also, in this study analyzed the differences between 2 groups based on the career of CEO (work for government funded research institutes VS the others). This study can be utilized when policy making and practice about technology based start-up.

• Journal of Digital Convergence
• /
• v.11 no.11
• /
• pp.117-132
• /
• 2013

This study shows how financial education for middle-age affects their remaining life (economic, physical, emotional and social) and improves the way of preparing for their old age through 355 questionnaires using SPSS 18.0, factor analysis, t-test and ANOVA program. The results obtained are summarized as follows: Firstly, The importance of financial education has been differently perceived by the age, marital status, income and religion. Secondly, the necessity for early financial education and retirement preparation have been comprehended by analyzing the effects of the financial education on their old life. Thirdly, Attitude for retirement has affirmative effects on the self respect, economic stability and leisure activity.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.19 no.1
• /
• pp.98-104
• /
• 2018

The assessment of the light trespass in terms of light pollution is difficult due to the complexity of light environments. As a result, the light pollution research has examined the influences of light pollution using simulation program such as RELUX. However, there still exists a differences between the real measurement value and the simulation value for the light trespass. In this paper, we analyzed the light trespass using the RELUX simulation program, and compared results with real measurement values. In this study, the regions (Seoul, Incheon, etc.) were investigated regarding the light trespass for outdoor lighting. The survey of vertical illuminance was analyzed measuring point (more than 2 point) out the window that was expected to light trespass for the higher anticipated to illumination. The illuminational predicted values for the RELUX program were compared with maximum one. As a result of this study, the illuminational errors between the measurement values and predicted values for the simulation were examined from -0.97 lx to 0.65 lx except 2.08 lx and -7.70 lx. The light trespass was analyzed the higher by how much the located close to the height, length, width of the outdoor lighting for the window. For measuring predicted values using RELUX, it was not sufficiently considered in the simulation conditions because of environmental factors and investigator error etc. Limitations of this study include the limited number of measurements, and greater field data is required in future studies.