" The Korean Journal of Chemical Engineering " 게재 논문 요약 : Processabilities & Mechanical Properties of the Biodegradable LDPE / Modified Starch Blends

Young Jin Kim,Yong Man Lee,Hyang Mok Lee,O Ok Park 한국화학공학회 1994 NICE Vol.12 No.5

N/A An investigation of the biodegradable polymers based on starch has been accomplished. Starch needs to be modified before blending with low density polyethylene(LDPE) because of its hydrophilicity. Three kinds of modification methods were applied to obtain the compatibility to starch-LDPE blends. The first one was the esterification of the hydroxyl group of starch with acetic anhydride. The second was the copolymerization of actylonitrile and styrene onto starch. The last was the esterification reaction of the hydroxyl group of starch with three kinds of ionomers. The tensile strength, % elongation, Young`s modulus, and shear viscosities of blends of the modified starch and LDPE were examined. Ionomer-treated starch showed better compatibility with LDPE to give better performances than other blends.

PROCESSABILITIES & MECHANICAL PROPERTIES OF THE BIODEGRADABLE LDPE/MODIFIED STARCH BLENDS

Kim, Young Jin,Lee, Yong Man,Lee, Hyang Mok,Park, O Ok 한국화학공학회 1994 Korean Journal of Chemical Engineering Vol.11 No.3

An investigation of the biodegradable polymers based on starch has been accomplished. Starch needs to be modified before blending with low density polyethylene (LDPE) because of its hydrophilicity. Three kinds of modification methods were applied to obtain the compatibility to starch-LDPE blends. The first one was the esterification of the hydroxyl group of starch with acetic anhydride. The second was the copolymerization of acrylonitrile and styrene onto starch. The last was the esterification reaction of the hydroxyl group of starch with three kinds of ionomers. The tensile strength, % elongation, Young's modulus, and shear viscosities of blends of the modified starch and LDPE were examined. Ionomer-treated starch showed better compatibility with LDPE to give better performances than other blends.

두부외상후 생존기간에 영향을 주는 요인분석

목직호,김한식,이규춘,이영배 동국대학교 경주대학 1997 東國論集 Vol.16 No.2

1995년 7월부터 1997년 7월까지 최근 2년간 본원 신경외과에 입원한 343례의 두부손상 환자중 사망한 25례를 조기사망군(7일이내)과 후기사망군(7일후)으로 분류하여 분석해본 결과 7.3%의 사망률을 보였으며 남자 사망자는 여자에 비해 3.2배였으며, 연령 별로는 조기사망군은 40대이상에서 많았고 후기 사망군은 60대 이상의 고령에서 다소 많았다. 조기사망군에서는 낮은 GCS, 비정상적인 동공반사 반응, 타장기 손상, 저혈압, 저산소증, 고혈당, 심한 정중전이, 뇌실압박, 두개골 골절, 개두술의 빈도가 높게 조사되었다. 이송시간은 조기사망군에서 1시간 이내에 도착한 경우가 많아 신속한 후송이 이루어졌다. 한편 후기사망군에서는 저이산화탄소혈증, 빈혈, 고나트륨혈증등이 높게 조사되었다. 사인은 조기사망군에서 1차성두개강내 병변 및 저혈량 등이 많았고 후기사망례는 폐렴, 성인성 호흡곤란 증후군, 외상후성 뇌경색증 등이 주요 사망 원인이었다. 따라서 생존기간별로 위험도가 높은 요소를 찾아 그에 대한 적극적인 치료를 하는 것이 두부 손상으로 인한 사망률을 개선하는데 바람직한 것으로 생각된다. We present a study the variable factor in the early(within one week) and late death(after one week) after head injury. The multiple factors were analysed on the clinical, imaging, and laboratory characteristics of 25 patients who were dead among 343 head injured persons during recent 2 years form July, 1995 to July, 1997. The mortality rate was 7.3% and the ratio of male to female was 3.2 to 1. The early death were younger than late death(5th decade vs 7th decade). Mechanism of injury were motor vehicle accident(64%), followed by work-related, slip and fall, and unknown. The early death had a higher percentage of low GCS score, abnormal pupil reflex, other associated injury, hypotension, hypoxemia, hyperglycemia, midline shift, ventricle compression, skull fracture, and craniotomy compared with the late death. On the other hand, the late death had a higher incidence of hypocarbia, anemia, and hypernatremia than the early death. The main causes of death were primary intracranial lesions and hypovolemia in the early death and pneumonia, ARDS, and posttraumatic cerebral infarction in the late death.

Methazolamide와 Acetazolamide 복용 후 유발된 천식 1예

이건화,이영목,김양기,김기업,어수택,박춘식 대한알레르기학회 2004 천식 및 알레르기 Vol.24 No.2

실내공기정화기에서 먼지 및 유기물화합물의 동시 제거에 관한 연구

목영선,강호철,이호원,현영진 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.1

The indoor air cleaner used in this study consisted of a plasma reactor followed by an electrostatic precipitator. The role of the electrostatic precipitator is to collect particulate matters, and the plasma reactor plays an important role in decomposing organic compounds and precharging particulate matters in order that they may easily be collected in the following electrostatic precipitator. For the performance test of the air cleaner, toluene, trichloroethylene (TCE), n-butanol and methanol were added to the indoor air. According to the experimental data, the collection efficiency of particulate matters was found to be largely enhanced when the plasma reactor was operated. This enhancement of collection efficiency is believed to result from precharging particulate matters. A large amount of electrical energy was required for the decomposition of the organic compounds, which indicates that the indoor air should be repeatedly circulated for proper treatment.

Nd:YAG 레이저 및 아크의 복합 용접에 관한 연구

이목영,김재웅,김기철 한국레이저가공학회 2003 학술발표대회 Vol.2003 No.1

두께 2.0mm 열연강판을 대상으로 GMA 용접과 Nd:YAG 레이저 용접의 복합화에 따른 용접성을 알아보았다. GMA 용접과 레이저 용접의 공정 변수를 제어하므로서 용접부 크기제어가 가능하였으며, 특히 합금량이 높은 경우에는 filler의 성분을 조절하여 용접비드의 야금학적/기계적 특성 제어가 용이하였다. 레이저-아크 하이브리드 용접은 알루미늄 혹은 고강도강과 같이 용접이 어려운 소재의 용접에 적당하였으며, 상대적으로 낮은 출력의 레이저를 사용하므로서 용접 cost의 저감이 가능하였다.

흡착제 및 오존발생기를 이용한 질소산화물 제거

이주혁,목영선 제주대학교 공과대학 첨단기술연구소 2005 尖端技術硏究所論文集 Vol.16 No.2

The injection of ozone, generally produced by a dielectric barrier discharge device, into the exhaust gas gives rise to a rapid oxidation of NO that is the main component of nitrogen oxides (NO_(x)) in most practical exhaust gases. Unlike NO, NO_(2) has a strong adsorptivity. Thus, once NO is converted into NO_(2), it can easily be removed by an adsorbent. The adsorbent used in this study was a mixture of activated carbon and calcium oxide. The present two-step process (NO oxidation followed by adsorption) was able to remove 55-80% of nitrogen oxides initially contained in the exhaust gas.

전기투석에 의한 아세트산의 농축 : 이온이동의 모델링 Ion Transport Modeling

이병철,김영목,이상운 弘益大學校 産業技術硏究所 2005 産業技術 Vol.15 No.-

This paper deals with the concentration of acetic acid using monopolar electrodialysis its modeling. Voltage changes, energy consumption were measured at various acetic acid concentrations, pHs, and current densities. Based on the experimental results, mathematical models were developed. Model predictions of acetic acid concentration and pHs were in good agreement with the experimental data.

분사장치가 없는 소형 세정집진기의 면분진 집진 특성

이호원,목영선,현영진 濟州大學校 海洋硏究所 2002 해양과환경연구소 연구논문집 Vol.26 No.-

오염기체 유도용 fan 만으로 분진을 포함하는 기체와 세정액을 효과적으로 접촉시킬 수 있는 방법을 제시하였다. 기체가 고안된 유로를 따라 통과할 대 액적이 생성되었으며, 이 액적에 의해 기-액간의 물질전달면적이 증가되었다. 이러한 방식의 스프레이가 없는 세정집진기는 장치 제작비와 운전비가 매우 저렴할뿐만 아니라 구조가 매우 간단하여 고장율이 매우 낮고, 소형화가 가능하였다. 면분진을 대상으로 스프레이가 없는 세정집진기의 집진효율을 측정한 결과 분진입자 크기가 클수록 집진효율은 증가하였고, 1 ㎛ 이상의 분진과 4 ㎛ 이상의 분진에 대한 평균 제거율은 각각 86%와 94%이었다. 또한 계면활성제를 세정액에 첨가하였을 때 집진효율은 증가되었다. 세정액의 계면활성제 농도를 1x10^-3wt%로 했을 때, 1 ㎛ 이상의 분진과 4㎛ 이상의 분진에 대한 평균 제거율은 각각 89%와 97%이었다. 그러나 고농도(3x10^-3wt% 이상)의 계면활성제를 사용하였을 경우에는 운전 중에 거품이 과도하게 형성되어 정상적인 조업이 어려웠다. Compact wet scrubber without spray in which the gas including dust can be contacted effectively with liquid was suggested. Gas introduced forcibly into the designed channel by fan atomized some of the liquid into droplets that enhanced mass rtansfer surface and dust collection. This scrubber does not require spry and solid-liquid separation system, it has the advantage of miniaturization and cost. The collection efficiency was 86% and 94% for cotton dust more than 1㎛ and 4㎛ diameter respectively. The collection efficiency for cotton dust increased with the addition of surfactant. When washing solution of 1x10^-3wt% surfactant was used, it was 89% and 97% for more than 1㎛ and 4㎛ diameter respectively. But regular operation was impossible for higher concentration than 3x10^-3wt%, because of the formation of excess foam.

저온 플라즈마를 이용한 휘발성 유기화합물의 분해에 관한 연구

목영선,이호원,현영진 제주대학교 환경연구소 2000 환경연구논문집 : 제주대 Vol.8 No.-

A non-thermal plasma process using pulsed corona discharge was applied to the destruction of a volatile organic compound (propene). Propene was found to be easily destroyed by this process, and the destruction efficiency was proportional to the supplied power while it was in inverse proportion to the initial propene concentration. Ethane and formaldehyde were detected at the reactor outlet, but the concentrations of such byproducts were negligible. The destruction rate equation (first order in terms of propene concentration) and the rate constant (6.75×10^(3)s^(1)W^(1)) proposed were validated by the comparison between the calculations and experimental data. The increases in the contents of oxygen and water vapor decreased the pulse energy delivered to the plasma reactor. At the initial concentration of 5.85 X 10^(3) mol/㎥, the average energy requirement to destroy one molecule of propene was in the range of 26 to 47 eV according to the amount of propene destroyed, which is relatively low value, compared with that of nitric oxide(NO).