• Publications of The Korean Astronomical Society
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• v.21 no.1
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• pp.11-20
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• 2006

We carried out a follow-up study on the students who participated in International Astronomy Olympiad(IAO). We surveyed home and school environment, personal characteristics with regard to four high school student and five college students who participated in IAO from 2002 to 2005. In the home environment variable of science elite students who took part in the IAO, we found out significant corelation between science elites and their parent's educational career. In their personal characteristics, we found out considerably their motivation capacity, intelligent curiosity, flexible and creative thinking ability. This study illuminated that the experience of IAO participation offered the opportunity for the students to gain mare self-esteem and positive confidence on scientific study. The IAO experience is construed to effect greatly the students' future. Through the IAO experience, the participating students are expected to major in astronomy and become excellent astronomers in the future. We expect that the interest of student will increase greatly in the area of astronomy and it will contribute to the substantial development of Korean astronomy. In this respect, with the constant support to the IAO participants, the effort to cultivate outstanding astronomers and follow-up study on those participants of the IAO should be continued.

• Proceedings of the SCSK Conference
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• 2003.09b
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• pp.438-447
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• 2003

We selected 113 subjects (male:59, female:54) in 20 to 29 age and observed the skin color difference between female and male. Also we measured the minimal persistent pigment darkening dose (MPPD) in same subjects. The skin colors of upper inner arm and back were measured with chromameter (CR10, Minolta, Japan) which represents skin color as $L^{*}$, $a^{*}$, and $b^{*}$ in value. MPPD was measured with solar simulator multi-port 601(Solarlight Co. USA). All statistical analysis was performed on the computer software package SPSS 8.0. The skin colors between male and female was significant difference in back and upper inner arm. There was significant difference of skin colors between back and upper inner arm in both male and female. There was no relationship existed between the values of MPPD and skin color ( $L^{*}$ $a^{*}$ $b^{*}$) of back in both male and female. As a result of survey, we knew that there was apparent difference of skin color between back and upper inner arm due to gender. Also we hope these data will be helpful to study on the correlation of the pigmentation index and skin color.(omitted)omitted)ted)

• Korean Journal of Health Education and Promotion
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• v.9 no.1
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• pp.14-29
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• 1992

의학이 발달하고 수명이 연장되고, 그리고 식사가 보다 서양화되는 등 생활양식이 변화됨에 따라 성인병이 1970년대부터 한국에 보다 늘어나게 되었다. 본 연구는 면접 및 설문지법을 이용하여 성인병, 특히 고혈압, 당뇨병 및 암에 관하여 도시 및 시골 거주자들의 지식, 태도 및 실천을 비교 연구하였다. 연구기간은 1990년 1월 부터 12월까지 1년동안이었고 대상은 전체 716명으로 그중 360명은 부산시 거주자였고 356명은 부산 근교의 시골거주자였다. 고혈압, 당뇨병 및 암에 대해 알고 있다고 응답한 대상자는 각각 92.6%, 92.0% 및 74.7%였다. 고혈압, 당뇨병 및 암의 지식도에 있어서 도시 거주자들이 시골 거주자보다 유의하게 더 많이 알고 있었다(각각 p<0.001). 그러나 성인병에 관한 태도와 지식에 있어서는 도시 거주자와 시골 거주자 사이에 유의한 차이가 없었다(p<0.05). 고혈압의 지식도는 거주지(r=0.2159, p<0.01) 및 수입 (r=0.1882, p<0.01)과 유의한 상관관계가 있었고, 당뇨병에 관한 지식도는 거주지(r=0.3952, p<0.001), 수입(r=0.3663, p<0.001) 및 직업(r=0.2576, p<0.001), 수입(r=0.4138, p<0.001), 직업(r=0.3044, p<0.001) 및 성별(r=-0.1887, p<0.01)과 유의한 상관관계가 있었다. 성인병에 관한 태도는 성별(r=0.4748, p<0.001), 경제상태(r=0.2209, p<0.01) 및 고혈압 지식도(r=0.1844, p<0.01)와 유의한 상관관계를 나타내었다. 성인병에 관한 실천은 본 연구에서 어떤 변수와도 상관관계가 없는 것으로 나타났다. 성인병이 이전보다 더 많아짐에 따라 연령이 증가하는 나라와 개발국가에서 성인병이 주요한 대상질환이 될 것이고, 질병예방과 건강증진의 차원에서 성인병을 예방하기 위해 보건교육에 보다 중점을 두어야 할 것이다.

• Proceedings of the SCSK Conference
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• 2003.09b
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• pp.519-523
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• 2003

Alpha hydroxy acid (AHA) includes a group of organic acids found in natural foods such as sugarcane (glycolic acid), milk (lactic acid), apples (malic acid) and oranges (citric acid). Earlier studies demonstrated the effect of AHAs on the skin by diminishing the adhesiveness of the corneal layer and increasing the viable epidermal thickness. Recent data suggest that AHAs have some effects on the dermal component of skin and even affect the aging process of the skin. A previous study revealed increased collagen production by treatment with glycolic acid among AHAs in vitro. However, the mechanism of the regulation of collagen production by glycolic acid was unclear. In present study, we tried to demonstrate the effect of glycolic acid on human dermal fibroblasts and to unveil the mechanism of regulation of collagen production by glycolic acid in human dermal fibroblasts: proliferation of fibroblasts and collagen synthesis and degradation by collagenases in fibroblasts. Our results suggested that glycolic acid had no effect on proliferation and cytotoxicity of adult human dermal fibroblasts. However, glycolic acid not only induced the increase of the collagen synthesis in human dermal fibroblasts at lower concentration than 0.1 % but also inhibited MMP-2 activity of human dermal fibroblast in the range between 0.01 and 0.4% and MMP-9 activity of human dermal fibroblast in the range between 0.06 and 0.09%. In summary, our results suggest that glycolic acid may increase wrinkle reduction partially by both increase in collagen synthesis and decrease in collagen degradation.

• Journal of the korean veterinary medical association
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• v.21 no.7
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• pp.413-422
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• 1985

This study was conducted to investigate the prevalence of the internal parasitisms of Korean native black goats which are grazing on the western mountainous land and southern island of Gyeongnam province of Korea. Forty hundred and forty-six heads of Kore

• International Journal of Precision Engineering and Manufacturing
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• v.2 no.2
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• pp.31-37
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• 2001

In this paper, a method to improve judder by changing the front and rear wheel brake force distribution ratio was proposed. ADAMS, a commercial dynamic analysis software was used to model a small size bus and its modeling procedure was explained. By using the ADAMS vehicle model, the judder phenomena of the small bus were analyzed, and based on analysis results, the validity of the improvement method was proposed. Also in order to lessen the problem jubber sensitivity analysis and test results were proposed.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.05a
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• pp.557-560
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• 2000

The Purpose of this study is analysis of kinematic for a modified manipulator and experimental test to certify auto-balancing operation. The test is carried out as follows. First, we solve the inverse kinematics and then do a closed loop control. Second we confirm translation displacement and rotation angle of a manipulator.

• Proceedings of the Optical Society of Korea Conference
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• 2000.08a
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• pp.146-147
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• 2000

광 대역투과 필터$^{(1)(2)}$ 는 WDM 광통신 시스템에서의 채널 선별에 사용되거나 좁은 선폭의 광원을 제작하는 데 사용된다. 또한 광원의 파장을 분석하는 광스펙트럼 분석기나 광섬유 센서 시스템에서 신호처리용 파장 필터 등으로도 널리 쓰이고 있는 중요한 광소자 중에 하나이다. 본 연구에서는 코어 모드감쇠기와 음향광학 가변 필터$^{(3)}$ 를 사용하여 새로운 전광섬유 형태의 광 대역투과 필터를 구현하였다. 본 광 대역투과 필터는 필터의 중심 파장 및 필터의 투과율을 전기적으로 쉽고 빠르게 제어할 수 있다는 장점을 가지고 있다. (중략)

• Proceedings of the PSK Conference
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• 2002.10a
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• pp.426.1-426.1
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• 2002

In this study. we modified the cationic liposomes by polyethylene glycol (PEG)-grafted or PEG-added methods. The PEG-grafted transfection complexes were prepared by adding the plasmid DNA to the PEG-grafted cationic liposomes, composed of PEG and cationic lipids. PEG-added transfection complexes were prepared by adding the PEG to the mixture of cationic lipids and plasmid DNA. The particle sizes of PEG-modified transfection complexes did not change during storage compared to conventional transfection complexes. (omitted)

• Proceedings of the PSK Conference
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• 2002.10a
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• pp.427.1-427.1
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• 2002

To improve stability and transfection efficiency, a novel combination of cationic emulsion and galactosylated chitosan was developed for targeted gene delivery. Six formulations of cationic liposome and our novel emulsion were prepared for comparison of stability and transfection efficiency. Cationic liposomes composed of 3［N-(N.N dimethylaminoethylene) carbamoyl］ cholesterol (DC-Chol) and dioleyl phophatidyl ethanolamine (DOPE) were prepared by extrusion method and cationic emulsions composed of DC-Chol. DOPE. castor oil, and Tween 80 were prepared by sonication method. (omitted)