• 한국치위생학회지
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• 제14권4호
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• pp.555-561
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• 2014

Objectives : The aim of this study was to investigate the factors related to stress perception. Methods : A self-reported questionnaire was filled out by 109 people living in Gimpo city from January 16 to April 15, 2013. The data were analyzed using SPSS window ver. 19.0(IBM CO., Armonk, NY, USA) for t-test, one-way ANOVA, and multiple linear regression analysis. Results : Men and group of 59 years old tended to have higher stress perception than women and those who over 60 years old, but the results were not statistically significant. Stress perception was higher among the group with systemic dryness and oral dryness(each${\geq}1$) and the group reporting high difficulty in daily living due to oral problem(${\geq}2$)(p<0.05). Especially, the factor that was most correlated to stress perception was systemic dryness(${\beta}$=0.347) followed by problem of daily living for oral problem(${\beta}$=0.278, p<0.01). Conclusions : Systemic dryness and oral problem can increase the level of stress perception, mouth dryness and oral problems are a part of stress responses. Therefore, the regular health checkup must be done and early treatment to reduce stress perception as well as negative aspects caused by stress. It will contribute to the enhancement of public health and life of quality.

• 한국구조물진단유지관리공학회 논문집
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• 제7권1호
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• pp.165-172
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• 2003

The fatigue problem of Prestressed Concrete(PSC) bridges are more serious than the other type of concrete bridges, because the cross sectional area and self weight of PSC bridges are smaller. The endurance of strengthening methods for PSC bridges are tested in this study. Glass fiber sheeting and external post-tensioning methods were applied. 1/5 scale PSC beams were made for fatigue test, same as static test. The range of repeated load is from 10% to 80% of yielding load with sine curve. The experimental results show that the failure cycle of strengthened members are increased compare to non-strengthened members. The members strengthened with glass fiber show better enhancement in fatigue problem than the members strengthened with external post-tensioning method, though the adhesion of glass fiber and concrete is failed, as increase of crack. With these experimental results, it can be said that the strengthening methods used in this study are efficient at extending the life time of aged PSC bridges.

• 한국주거학회논문집
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• 제28권2호
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• pp.35-45
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• 2017

This study aimed to explore housing welfare service situation in City of Cheongju, Chungbuk, and assess demands for the service improvement through interviews of public and private field specialists in order to seek practical implications for enhancement of housing welfare policy and system in Cheongju. In December 2016, a series of personal and focus group interviews using semi-structured questionnaires were conducted to total 10 specialists who were currently providing and housing services. Major findings and implications are as follow. (1) City's own housing survey and database construction are in need for development and implementation of housing welfare service programs serving local needs effectively and efficiently. (2) The field specialists perceived importance of realignment of service system and to establishment of the Cheongju housing welfare center as a control tower of the services. (3) It is required to provide various opportunities to strengthen the specialists' competence through education, training and networking and to arrange persons in charge of housing programs in every community-level self-government. (4) The specialists showed their strong interests in introduction of diverse housing welfare services and programs.

• Korean Membrane Journal
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• 제6권1호
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• pp.55-60
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• 2004

In recent years, an increasing interest in membrane technology has been observed in chemical and environmental industry. Membrane technology has advantages of low cost, energy saving and environmental clean technology comparing to conventional separation processes. Pervaporation is one of new advanced membrane technology applied for separation of azeotropic mixtures, aqueous organic mixtures, organic solvent and petrochemical mixtures. Sodium alginate composite membranes were prepared for the enhancement of long-term stability of pervaporation performance of water-ethanol mixture using pervaporation. Sodium alginate membranes were crosslinked with CaCl$_2$ and coated with polyelectrolyte chitosan to protect washing out of calcium ions from the polymer. The surface structures of PAN and hydrolysed PAN membrane were confirmed by ATR Fourier transform infrared (FT-IR). A field emission scanning electron microscopy (FE-SEM; Jeol 6340F) operated at 15 kV. Concentration profiles for Ca in the membrane surface and membrane cross-section were taken by an energy dispersive X-ray (EDX) analyser (Jeol) attached to the field emission scanning electron microscopy (Jeol 6340F). Pervaporation experiments were done with several operation run times to investigate long-term stability of the membranes.

• 수산해양교육연구
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• 제24권6호
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• pp.763-780
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• 2012

The purpose of this study was to develop the teaching & learning model to increase the key competencies in the university. For this, the researcher suggested the draft of teaching & learning model in the university based on literature analysis and survey for key competencies education to professors and students. After that, the draft of the model was revised through the formative test by experts. And then, the revised model was verified through delphi survey and a final model was fixed. As the result of this study, features of the final model are as follows. First, this study identified that a core values of teaching and learning model for the key competencies education in the university is reinforcement of learner's thinking skills and enhancement of field oriented on learning contents and reinforcement of professor's role as a mentor, a facilitator, a motivator, and an informant. Second, The core learning activity's process of the teaching and learning model for the key competencies education in the university consists of the following in order: team-building, exploring problem, gathering and analysing informations, arranging of leaning outcomes, comprehensive arrangement and self-examination.

• 가정과삶의질연구
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• 제30권1호
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• pp.77-88
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• 2012

This study has developed on Virtues Project program, which enhances parent communication abilities. The purpose of this study is to verify the improvement on parent communication skills after taking a program. To obtain effective children educational direction, we have offered assistance to the parents that understanding the importance of the parental instruction, improvement of the relationship between parents and children. To enhance the parent communication ability, this program is consisted of five virtue strategies, structured activity programs and various self-examination for attending parents to the program rather than listening the lecture. This program is consists of six session with two hours each session for six weeks. I have studied 26 subjects and they were divided into experiment group and control group. According to this study, this program works on improving parent communication skills. Namely, experiment group showed significant enhancement of communication abilities compared to that of control group.

• Bulletin of the Korean Chemical Society
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• 제34권8호
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• pp.2271-2275
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• 2013

We report on the photoelectrochemical properties of partially reduced mesoporous titania thin films. The fabrication is achieved by synthesizing mesoporous titania thin films through the self-assembly of a titania precursor and a block copolymer, followed by aging and calcination, and heat-treatment under a $H_2$ (1 torr) environment. Depending on the temperature used for the reaction with $H_2$, the degree of the reduction (generation of oxygen vacancies) of the titania is controlled. The oxygen vacancies induce visible light absorption, and decrease of resistance while the mesoporosity is practically unaltered. The photoelectrochemical activity data on these films, by measuring their photocurrent-potential behavior in 1 M NaOH electrolyte under AM 1.5G 100 mW $cm^{-2}$ illumination, show that the three effects of the oxygen vacancies contribute to the enhancement of the photoelectrochemical properties of the mesoporous titania thin films. The results show that these oxygen deficient $TiO_2$ mesoporous thin films hold great promise for a solar hydrogen generation. Suggestions for the materials design for improved photoelectrochemical properties are made.

• 가정과삶의질연구
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• 제20권6호
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• pp.11-24
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• 2002

The purpose of this study is to develop a Marriage Enrichment Program that can be applied to the actual lives of Korean families and couples, as well as adopted in family welfare programs. For this study, a quasi-experimental group design was employed and pre- and post- tests on Internal-External Control, Couple Communication, and Marital Satisfaction were conducted. Experimental participants consisted of six volunteer couples who responded to an advertisement by the Chonbuk Family Counseling Center printed in a daily newspaper. The experimental group received two hours of education on marital relationship enhancement every week for eight weeks. The control group received no such treatment. The effectiveness of the education was measured by Wilcox matched pair test, using a SAS program, as well as by the self-report of the participants. The results show that there was statistically significant improvement for the experimental group in all three areas of marriage-- internal control, couple communication, and marital satisfaction. In addition, the participants'evaluations were generally positive about the program. The participants reported that it was most helpful to learn through the educational program that individuals differ in basic needs and that they should not force personal beliefs on others. They also reported that their understanding of their spouse improved.

• Journal of Communications and Networks
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• 제8권3호
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• pp.330-338
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• 2006

Many web cache systems and policies concerning them have been proposed. These studies, however, consider large objects less useful than small objects in terms of performance, and evict them as soon as possible. Even if this approach increases the hit rate, the byte hit rate decreases and the connections occurring over congested links to outside networks waste more bandwidth in obtaining large objects. This paper puts forth a client-cluster approach for improving the web cache system. The client-cluster is composed of the residual resources of clients and utilizes them as exclusive storage for large objects. This proposed system achieves not only a high hit rate but also a high byte hit rate, while reducing outgoing traffic. The distributed hash table (DHT) based peer-to-peer lookup protocol is utilized to manage the client-cluster. With the natural characteristics of this protocol, the proposed system with the client-cluster is self-organizing, fault-tolerant, well-balanced, and scalable. Additionally, the large objects are managed with an index based allocation method, which balances the loads of all clients well. The performance of the cache system is examined via a trace driven simulation and an effective enhancement of the proxy cache performance is demonstrated.

• 융합신호처리학회논문지
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• 제3권1호
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• pp.41-47
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• 2002

프랙탈 영상압축은 원 영상블록과 가장 유사한 영역을 원영상 내에서 찾는 자기유사성에 기반한 축소변환을 이용하여 영상데이터를 압축시키는 방법이다. 프랙탈은 영상데이터를 압축하는 효율적인 방법으로 인정을 받고 있으나 상대적으로 높은 영상 왜곡률과 부호화 시간이 오래 걸리는 단점을 가지고 있다. 본 논문은 프랙탈의 영상 왜곡률 특성을 개선하기 위하여 프랙탈과 벡터양자화기를 혼합하였으며, 벡터양자화기의 클러스터링 알고리듬으로는 개선한 Self Organizing Feature Map(SOFM)을 사용하였다. 제안된 시스템의 성능평가를 위하여 일반적인 SOFM을 사용한 시스템 그리고 프랙탈을 단독으로 사용한 시스템과 비교하여 전체적인 성능 향상 정도를 확인하였다. 그 결과 개선한 경쟁학습 SOFM을 사용한 벡터양자화기와 프랙탈 혼합시스템이 일반적인 SOFM을 사용한 벡터양자화기와 프랙탈 혼합시스템보다 영상 왜곡특성이 향상된 것을 확인하였다.