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.

부산광역시 일부하천의 계절적·년도별 수질특성 비교분석

정유진,문종익,성낙창,김부길,이영형 동아대학교 환경문제연구소 1999 硏究報告 Vol.22 No.1

This study is carried out to investigate the water quality change trends in Pusan Metropolitan streams. The temperature of the streams are moderate except in winter period and this can be explained by the Korean meterological characteristics. The pH does not vary by the time but some points are a little low. BOD_(5) and COD_(Mn), the index of water contaminants, be shown as characteristic domestic waste water patterns. The nutrient matters, such as total nitrogen and total phosphate, are appeared to be low. The chronic water quality, as BOD_(5) and COD_(Mn), shows that the loading rates in 1998 are smaller than the past(1983, 1992). Some points show a little high loading in autumn, but this needs more investigation to make clear the cause(s).

생분해성 펙틴/전분 블렌드 필름의 물성

정병욱,신부영 嶺南大學校 環境問題硏究所 1998 環境硏究 Vol.17 No.2

요약문 가소제로 글리세롤과 물을 사용하여 펙틴/전분 블렌드를 이축압출기를 이용하여 제조하였다. 펙틴/전분 비와 가소제의 함량을 변화시킨 블렌드는 열가소성 성질을 보였으며, 펙틴/전분비가 아주 높은 블렌드는 열가소성 성질이 약하였다. 필름은 필름다이를 장착한 일축압출기로 제조하고, 필름에 포함된 수분은 진공오븐으로 증발 시켰다. 필름의 인장 물성은 가소제인 글리세롤의 함량과 건조후 대기 중에서 흡수한 수분의 량에 따라 크게 변화하였으나, 팩틴/전분비와 초기에 가소제로 첨가한 물의 함량변화에는 영향이 적었다. 열분석기는 블렌드에 결정이 남아있는 흡열 곡선을 보이지 않았다. Abstract The blend of pectin, starch, glycerol, and water wasprepared by using a twin-screw extruder. The ratio of pectin/starch, glycerol content,and water content were varied. Most of these blends had a good thermoplasticity, but very higher pectin/starch ratio blends showed a poor thermoplasticity. The film was prepared by using a single-screw extruder with slit die and then dried film much depend on the glycerol content and water absorption, while pectin/starch ratio and water content added at mixing had less effecton the tensile properties. DSC thermogram did not show any kind of endothermic of crystal melting.

人蔘이 卵巢摘出로 誘發된 흰쥐의 骨多孔症 예방에 미치는 효능

정국영,서부일,이은숙,변부형,신순식,박지하 대한본초학회 2004 大韓本草學會誌 Vol.19 No.1

Objectives : The present study has been undertaken to investigate the effects of Ginseng Radix on prevention of osteoporosis in ovariectomized rats. Methods : In this experiment, the rats were ovariectomized. Rats were administered by 2 kinds of medicine, Estradiol, Ginseng Radix. The levels of bone mineral density, osteocalcin, ALP, phosphorus, calcium in serum, deoxypyridinoline in urine, calcium, phosphorus, ash weight of bone, body weight and uterus weight were measured. Results : The levels of spinal bone mineral density was significantly increased in comparison with OVX group at 8 weeks in Ginseng Radix group. The levels of serum didn t show significant change in comparison with OVX group in Ginseng Radix group. The levels of urine deoxypyridinoline showed significant decrease in comparison with OVX group in Ginseng Radix group. The levels of femoral and fibula-tibial ash weight didn t show significant increase in comparison with OVX group in Ginseng Radix group. The levels of femoral and fibula-tibial calcium showed significant increase in comparison with OVX group in Ginseng Radix group. The levels of femoral and fibula-tibial phosphorus showed significant increase in comparison with OVX group in Ginseng Radix group. The levels of body weight didn t show significant changes in comparison with OVX group in Ginseng Radix group. The levels of uterus weight didn t show significant changes in comparison with OVX group in Ginseng Radix group. Conclusions : Reviewing these experimetal results, it appears that Ginseng Radix have efficacy on prevention of osteoporosis. And further study should be conducted to illustrate in depth the curing and prevention of osteoprosis.

PLA/TPS 블렌드의 물성과 형태학에 관한 연구

정병욱,신창호,김영진,신부영 嶺南大學校 環境問題硏究所 1998 環境硏究 Vol.18 No.1

본 연구에서는 polylactide(PLA)/thermoplastic starch(TPS) 블렌드를 3가지 공정으로 제조하여 블렌드의 물성과 형태학의 변화를 조사하였다. 본 목적을 위하여 PLA와 TPS를 이축압출기로 단순히 블렌드한 단순 블렌드, PLA를 TPS와 블렌드하기 전에 maleic anhydride와 개시세로 먼저 말레익화 시킨 maleated PLA (MPLA)를 TPS와 블렌드한 MPLP/TPS 블렌드와 PLA, TPS, MA 및 개시제를 동시에 브렌드하는 in-situ PLA/TPS 블렌드를 제조하였다. DSC로 측청한 유리전이온도(Tg)의 변화가 없는 것으로 보아 블렌드 공정에 따른 상용성의 변화는 없었다 인장강도와 탄성율은 TPS의 함량에는 의존하나 블렌딩 공정에는 영향이 없었다. 형태학의 변화는 블렌딩 공정에 따라 큰 변화를 보였다. In-situ PLA/TPS 블렌드의 경우 분산상의 크기가 고르고 분산이 잘되었으며 계면접착 또한 아주 좋았다. 이는 상분리는 일어나지만 기계적 상용성이 있음을 보여준다. To study the effect of blending process on the properties and morphology of PLA/TPS blends, simple PLA/TPS blend, maleated PLA/TPS blend, and in-situ PLA/TPS/MA/initiator blend were prepared. Glass transition temperature of PLA in blends was not changed by the blending process and the composition of TPS. This may be the lack of compatibility between PLA and TPS. Tensile strength and modulus of blends were depend on the composition of TPS whereas, blending process did not effect on the tensile properties. The morphology of blends was highly depends on the blending process. In situ blend showed a good dispersion of TPS in matrix and a good interfacial adhesion between TPS and PLA matrix. This may be mechanically compatible but phase-separated.

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.

경도관 동맥색전술을 이용한 비정상 자궁출혈의 치료

양승부,최교창,이상진,정영진,임한혁,한효상,황인철,조환성 순천향의학연구소 2005 Journal of Soonchunhyang Medical Science Vol.11 No.1

Objective : Our purpose of this study is to evaluate the effectiveness of the transcatheter arterial embolization for the management of abnormal uterine bleeding. Materials and Methods : 14 patients with massive or recurrent uterine bleeding underwent percutaneous transcatheter arterial embolization between February 2003 and September 2004. We reviewed 14 cases of uterine artery or internal iliac artery embolization using gelfoam or PVA particles. Results : Good management of uterine bleeding was achieved in 13 of 14(93%) cases. The cause of abnormal uterine bleeding was myoma(5 case), post D & E bleeding(3), acquired vascular malformation(3), pseudoaneurysm(1), adenomyosis(1), and endometrial hyperplasia(1). Conclusion : Transcatheter artery embolization is an effective and life-saving procedure in massive or recurrent uterine bleeding. Early diagnosis and prompt transcatheter arterial embolization is a useful mangement of uterine bleeding.

제어기 출력오차 방법을 이용한 적응 퍼지제어

설재훈,정영호,장종승,임영도,최부귀 東亞大學校 附設 情報通信硏究所 1998 情報通信硏究所論文誌 Vol.6 No.1

In this paper, we apply the controller output error method to the adaptive fuzzy control design. This method employs a gradient descent algorithm to minimize a error function which is beased on the error at the controller output. This contrasts with more conventional methods which use the error at the plant output. The error function is minimized by adapting some or allof the parameters of the fuzzy controller. In this paper, we propose to revise the consequent parameter. The proposed adaptive fuzzy controller is applied to the adaptive control of a nonlinear plant and is shown to be capable of providing good overall system performance.

수용성 및 가식성 콩 단백질/�틴 블렌드 필름 제조 및 물성 연구

김성철,신용섭,정세환,유성구,박인식,김봉식,신부영 한국공업화학회 2003 응용화학 Vol.7 No.2

The manufacture of edible/biodegradable films or coatings can potentially add value to soy protein, Such films can find using as edible or nonedible food packaging materials. The effect of soy protein film-forming solutions on film formation, tensile properties of soy protein/pectin blend films were changed significantly by the amount of glycerol and the ratio of soy protein/pectin. Moreover mechanical properties of soy protein/pectin-montmorillonite clay have been studied. Tensile strength and modulus decreases as the relative humidity increased while with increasing relative humidity elongation at break increased.