페루프 극점의 견실성 해석

남부희,이정문 江原大學校 産業技術硏究所 1991 産業技術硏究 Vol.11 No.-

This paper deals with the robustness of closed-loop poles of a linear time-invariant system with uncertain parameters. A new method is presented to calculate the perturbation of a pole -located region due to parameter uncertainties. A method to calculate allowable bounds on parameter uncertainties is also presented to retain closed-loop poles in a specified region. Based on Lyapunov equations and norm operations, they provide useful measures on the robustness of closed -loop poles. An example is given to illustrate proposed methods.

퇴비화법에 의한 플라스틱 필름의 생분해도 연구

정병욱,신창호,김영진,장상희,신부영 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.1

Aerobic composting apparatus was set up using International Organization for Standardization(ISO) and ultimate biodegradability of plastic films was evaluated by measurement of released carbon dioxide at the end of test. Test materials were polycaprolactone(PCL), PCL/starch composite with various composition, photo-degradable, bio-destructible film, and high density polyethylene(HDPE) film. After 45 days, PCL and PCL/starch(70/30) composite films were degraded to 37% and 60%, respectively. This fact revealed that starch in PCL elevated the biodegradability of matrix PCL. Although photo-degradable and bio-destructible films also evolved carbon dioxide, matrix polymer(HDPE) was not degraded by microorganisms in compost. This fact was indirectly supported thermogravimetric analysis and morphology of film before and after composting.

콩 단백질/펙틴/몬모릴로나이트 나노복합 필름의 특성 및 산소 투과도 연구

정세환,김성철,조규순,신용섭,장상희,홍기헌,이태진,신부영 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.2

In this study, Mechanical property, thermal property, watervapor, and oxygen permeability of biodegradable Soy protein/Pectin-montmorillonite nanocomposite, prepared with Na^(+)-MMT, have been studied. X-ray diffraction and TEM experiments an polymer/silicate composite samples demonstrated that the intercalation of polymer chains leads to increase in the spacing between silicate layers. In addition, it were found that the intercalated Soy protein/Pectin/montmorillonite nanocomposite were prepared. It was found that the addition of only a small of clay was enough to improve the thermal stability and mechanical property of Soy protein/Pectin/montmorillonite nanocomposite. watervapor of Soy protein/Pectin/montmorillonite nanocomposite was generally lower than that of Soy protein/Pectin. oxygen permeability of Soy protein/Pectin/montmorillonite nanocomposite was generally lower than that of Soy protein/Pectin.

퍼지제어를 이용한 카메라가 장착된 이동로봇의 경로제어

조정태,이석원,남부희 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.B

This paper describes the path planning method in an unknown environment for an autonomous mobile robot equipped with CCD(Charge-Coupled Device) camera. The mobile robot moves along the guideline. The CCD camera is used for the detection of the existence of a guideline. The wavelet transform is used to find the edge of guideline. It is possible for us to do image processing more easily and rapidly by using wavelet transform. We make a fuzzy control rule using image data as an input then determined the position and the navigation of the mobile robot. The center value of guideline is the input of fuzzy logic controller and the steering angle of the mobile robot is the fuzzy controller output. Some actual experiments show that the mobile robot effectively moves to target position by means of the applied fuzzy control.

분해성 폴리에틸렌 필름의 생분해 및 광분해성에 관한 연구

신부영,장상희,정병욱 嶺南大學校 工業技術硏究所 1997 工業技術硏究所論文集 Vol.25 No.2

Photo-biodegradable master batch was prepared by using mechanical and thermal oxidation that in general occur during polymer processing operation. Master batches were prepared by melt mixing in air circumstance, respectively. High density polyethylene(HDPE) sheets containing 20 wt.% photo-biodegradable M/Bs were prepared by compression molding and we observed the photodegradability under the mercury-vapor lamp. The sheet of containing M/B prepared above 95% of its original elongation and very brittle within 120 hours irradiation, however, pure HDPE sheet still retained about 80% original elongation for 120 hours irradiation. Under the natural sunlight, photo-biodegradable HDPE films lost about 98% of its original elongation at break for 8weeks outdoor exposure in summer. The common film still retained 75% of its original elongation at the same period. Surface morphology of the films was examined by using scanning electron microscopy(SEM). The effects of water on the mechanical properties and morphology of film were examined during the irradiation. In the case of biodegradation test, incubator test were performed simultaneously. Microorganism (fungi) growth in photo-biodegradable film surface was augmented by exposed time increasingly.

유아놀이에서 나타나는 언어세계에 대한 의미 탐구

오정희,임부연 부산대학교 보육종합센터 영유아보육연구소 2008 영유아보육연구 Vol.14 No.-

Young children's world of language is fill with fresh and joyful sign. Play is one of the most significant context to reveal young children's language. This study attempts a phenomenological exploration on the meaning of children's language during play time. This study used phenomenological skills to observe 30 children's distinctive ability of using language during free play time in 5 year-old class at a kindergarten located in P city area. The data collected through 30 times of observation include observation note, in-depth interview with classroom teachers, and researcher's field note. The result showed that young children make rich the world of meaning to use and produce language in play time. The children knew what are the rule of play through insight and they create rules of play. They were also able to deconstruct and reconstruct signs by using imagination and metaphor which are the most powerful symbol of consciousness in early childhood period. This study discussed that early childhood teachers should be more careful to listen and respect children's own language which is not a measure of development or fuction but an expression of inner world.

Impedance를 이용한 전도성고분자 센서의 가스감응특성

이경문,유준부,이병수,전희권,이상태,이덕동,허증수 경북대학교 센서기술연구소 2002 센서技術學術大會論文集 Vol.13 No.1

척수손상·비손상인의 신체부위별 신체구성 및 골밀도 비교

김성수,황부근,김태수,이충일,양정수,이동희 한국특수체육학회 2003 한국특수체육학회지 Vol.11 No.1

This study was designed to compare segmental body composition and bone mineral density in spinal cord-injured(SCIS; n=9, SCIA; n=9) and non-injured control(AB; n=9) subjects. Dual-energy X-ray absorptiometry(DEXA) was used to measure %body fat, body fat mass, lean body mass, bone mineral contents, and bone mineral density in total and various body regions(arms, legs, trunk). The present results showed that body fat mass and %body fat were significantly higher and lean body mass was significantly lower in the SCIS group compared to AB group, while there was no difference between the SCIA and AB group in those of parameters. In BMC, there was no difference among groups and in BMD, SCI group was significantly lower that AB group, but there was no difference between SCIA group and AB group. Based on these results, in can be suggested that long-term regular exercise can reduce the negative changes in body composition, bone mineral density by spinal cord injury.

전분/펙틴/몬모릴로나이트 나노복합 필름의 특성 및 산소 투과도 연구

서석훈,서길수,유성구,신용섭,정세환,김성철,배광수,이태진,장상희,신부영 한국공업화학회 2003 공업화학 Vol.14 No.8

Na^(+)-MMT로부터 제조한 생분해성 전분/펙틴/몬모릴로나이트 나노복합재료의 기계적 특성, 열적 특성, 그리고 산소 투과성을 연구하였다. XRD와 TEM의 결과로부터 고분자의 삽입으로 인하여 실리케이트 층간 간격이 증가하였으며, 또한 삽입형 전분/펙틴/몬모릴로나이트 나노복합재료임을 확인하였다. 합성된 전분/펙틴/몬모릴로나이트 나노복합재료의 경우 적은 양의 MMT로부터 기계적 특성과 열적 안정성이 우수함을 보였다. 그리고 전분/펙틴/몬모릴로나이트 나노복합재료의 산소 투과성은 고분자 매트릭스에 분산되어 있는 몬모릴로나이트에 의하여 현저히 저하됨을 보여주었다. Mechanical property. thermal property. and oxygen permeability of biodegradable Pectin/Starch-montmorillonite nanocomposite, prepared with Na-MMT, have been studied X-ray diffraction and TEM experiments on polymer/silicate composite samples demonstrated that the intercalation of polymer chains leads to increase in the spacing between silicate layers. In addition, it were found that the intercalated Starch/Pectin/monotmorillonite nanocomposite were prepared. It was found that the addition of only a small amount of clay was enough to improve the thermal stability- and mechanical property of Starch/Pectin/montmorillonite nanocomposite. Oxygen permeability of Starch/Pectin/montmorillonite composite was generally lower than that of pectin/starch.

영양표시정착화사업(Ⅱ) : 식품참고량설정에 관한 연구 Study on the Establishement of the Reference Amount in Foods

김대병,장영미,김인복,이혜영,장재희,김보영,이정구,김창민,정해랑 식품의약품안전청 2000 식품의약품안전청 연보 Vol.4 No.-

본 연구는 영양표시에서 1회분량 및 영양소함량표시의 기준으로 사용되는 "식픔창고량"에 관한 연구를 수행하므로써 합리적이고 일관성있는 영양표시기준 개선을 위한 기초자료로 활용코자 하였다. 이를 위하여 미국 및 캐나다를 중심으로 제외국의 현황 및 식품참고량 설정방법을 조사 ·연구 하으며 제도도입 및 개선 방안을 강구하였파. 또한, 시판 제품의 영양료시현황 및 음료류 둥의 포장단위 등을 피악하여 식품참고량설정을 위한 기초자료로 활용코자 하였다. 앞으로 국민건강 ·영양조사자료의 체계적인 통계분석, 가공식품의 섭취량조사 등을 통하여 우리나라 국민의 1인 1회 섭취량자료의 축적이 선행되어야 할 것이다. The purpose of this ?roject is to study on the reference amounts customarily consumed per eating occasion to improve the nutrition labelling standards. We Performed to study on the methodology to establish the reference amounts on the basis of the review on the advanced counITy's status. And we investigated the packaged unit ofprocessed foods. Further study is needed to establlsh the customarily consumed amount per eating occasionthrough the statistical analysis of nationwide food consumption data. Our results will be helpful information to improve nutrition labelling system in Korea.