2 - Acylaminobenzothiazole 및 Benzothiazolylurea 유도체의 합성과 생리활성에 관한 연구

이정용,이천수,홍종욱 한국농화학회 1986 Applied Biological Chemistry (Appl Biol Chem) Vol.29 No.4

2-Acylaminobenzothizole derivatives were synthesized from 2-aminobenzothiazole and acylchloride. Benzothiazolylurea derivatives were synthesized from 2-aminobenzothiazole and phenylisocyanate. The products were identified by UV, IR, ¹H-NMR, ^(13)C-NMR spectra with 2-acetamidobenzothiazoie(Ⅰ), 2-propionamidobenzothiazole(Ⅱ), 2-butamidobenzothiazole(Ⅲ), 2-benzamidobenzothiazole(Ⅳ). The compounds were tested for their phytotoxicity on the germination and seedling growth of rice, radish and green pea plants, It eras found that treatment of 500ppm concentration each of 2-acetamidobenzothiazole, 2-propionamidobenzothiazole and 2-butamidobenzothiazole strongly inhibited of seedling growth of the radish and green pea.

경지와 노동력의 이용도 예측

이정용 한국농촌경제연구원 1981 농촌경제 Vol.4 No.2

연구노우트 : 축차적계획을 위한 주요농축산물의 융통성계수추정

이정용 한국농촌경제연구원 1979 농촌경제 Vol.2 No.2

Conformational Dynamics of Sub-Micron Sized Wormlike Polyelectrolyte Polymer in Flow Fields

이정용,정현욱,전명석,현재천 한국고분자학회 2012 Macromolecular Research Vol.20 No.11

Conformational dynamics of a single chain of wormlike polyelectrolyte xanthan polymer has been investigated in the external flow fields by employing a well-suited coarse-grained Brownian dynamics simulation. This goes beyond other simulations, which do not consider the hydrodynamic interaction between pairs of beads in polyelectrolyte polysaccharide and the long-range electrostatic screening effect. Conformational properties, such as the radius of gyration and the static structure factor, were unchanged with the flow strength parameter (i.e., Weissenberg number) in the uniform flow. However, influences by flow strength as well as flow type were evident in both simple shear and extensional-like flows with non-zero velocity gradients in flow regimes, commonly exhibiting a sigmoidal transition in the radius of gyration. Transition to a higher plateau, and independence of long-range electrostatic screening on chain conformation, can be encountered earlier with increasing flow strength, as a special feature of a polyelectrolyte in extensional-like flow. The translational self-diffusion coefficient increases when increasing either the flow strength or the electrostatic screening effect in uniform and simple shear flows. Scaling behavior of the static structure factor is quite well-correlated with respect to each flow field, where the Flory-Edwards exponent (ν)decreases with higher values of flow strength and flow type parameters, but for lower screening effect. Present results on the mesoscopic scale devoted to the bulk space can readily serve as the basis for further scrutiny of the behavior of wormlike polyelectrolytes within various flow fields in confined spaces.

철섬아연광의 건식제련에 관한 연구

이정용,고창식 대한금속재료학회(대한금속학회) 1965 대한금속·재료학회지 Vol.3 No.1

In order to find out an optimum condition for the extraction of zinc from domestic marmatite, a series of pyrometallurgical tests were carried out using flue-solid roaster and horizontal distillation apparatus. It was confirmed that the roasted marmatite was magnetized at above 950℃ and the intensity of magnetism was increased during air colling after roasting. The normal reduction temperature was found 950℃∼1000℃ for the marmatite calcine which is approximatly 100℃ higher than that of zinc blende calcine. In this experiment, the reduction equation of marmatite calcine by solid carbon at the range from 950℃ to 1370℃ is assumed as follows; ZnO·Fe₂O₃+2C = Zn+2FeO+2CO Carbon was sufficient with about two or three times of theoretical amount. Degree of reduction was 95% at 1300℃ after 10∼24 hrs treatment, and the purity of condensed zinc was 99%. It was also found the CaO is effective to increase the degree of reduction, ultimately up to 100%.

엑셀(Excel) 2000'을 이용한 산업연관분석 계산의 성능실험

이정용 인하대학교 산업경제연구소 2000 경상논집 Vol.14 No.2

In the input-output analysis, which was devised by the late Professor Leontief, calculation of the inverse matrix [I-A]??¹(A is the input-output coefficient matrix) is the most essential. About 40 years ago, when Korea had no computer, it was impossible to calculate inverse of a 50 X 50 input-output matrix. At present, personal computers are becoming ever popular and powerful every year. It became so easy to calculate a large-size inverse matrix even with a desk-top personal computer. In this paper a computer experiment was done to see how fast an ordinary desktop personal computer can calculate an inverse of a 50 X 50 input-output coefficient matrix, and to see how stable the results are. Also, since the [I-A]??¹ can be expressed as a series of I + A + A² + A³ + ……, result of this indirect inversing was compared with that of the direct inversing to see how fast it converges. For the experiment, the year 1995 75-sector input-output table published by the Bank of Korea was aggregated into 50 sectors. This 50-sector experiment was chosen because the 'EXCEL 2000', one of the most popular software for personal computers can calculate inverse matrix of maximum 52 dimensions. Astonishingly, the EXCEL command to invert a matrix, 'MINVERSE', could invert the 50 X 50 input-output coefficient matrix in 0.033 second. This means that it can invert a 50 X 50 matrix roughly 30 times per second. It was also found that the results were very stable with the error limit of ±1.0*10-15. When the [I-A]-¹ was approximated by the series I + A + A² + A³ + ……, the term A8 became very small to have S = ∑∑aij less than 1. In conclusion, this experiment has shown that today's desk-top personal com-puter can be widely used for a large scale input-output analysis.

도시내 녹지공간 조성을 위한 소규모 HSSF 인공습지 개발

이정용,강창국,Joan B. Gorme,김순석,김이형 한국습지학회 2011 한국습지학회지 Vol.13 No.2

세계적으로 물의 부족, 온실가스 배출증가, 에너지 소비 증가 등으로 인하여 지구가 위협받고 있다. 기존의 도시 계획 및 개발 과정에서 산림, 하천 등 자연 생태계가 파괴되어 왔으며 이는 불투수면의 증가를 초래하였다. 불투수면의 증가로 인하여 자연적인 물순환 체계가 파괴됨에 따라 도시내 물의 저류, 침투, 증발 등이 감소되고 있으며, 강우시 불투수면에서 발생하는 비점오염원이 하천 및 호소로 직접 유입되어 수계에 악영향을 끼치고 있는 실정이다. 본 연구에서는 강우시 불투수면에서 발생하는 비점오염물질을 저감하고 불투수면의 증가로 인한 도시지역의 온도증가, 열섬현상 등을 해결하는 소규모 HSSF 인공습지 기술을 개발하고자 한다. HSSF 인공습지는 표면에 물이 존재하지 않고 유체의 흐름이 표면 아래 수평으로 흐르는 습지이며 침전, 여과, 흡착, 식생에 의한 흡수 등의 기작을 포함한다. 이러한 HSSF 인공습지를 도시지역의 협소한 공간에도 적용이 가능한 소규모 형태로 개발하고자 pilot-scale test를 실시하였으며, 이러한 연구결과는 향후 국내 도시 열섬현상 저감 및 자연적 물순환 복원을 위한 시설 개발에 기초자료로 활용 될 것이다.

사육조건에 따른 일본(기수)재첩 유생의 성장과 생존

이정용,김완기,이채성,Lee, Jeong-Yong,Kim, Wan-Ki,Lee, Chae-Sung 한국패류학회 2011 The Korean Journal of Malacology Vol.27 No.4

일본(기수)재첩 유생사육을 위한 최적조건을 파악하기 위하여 수온, 염분, 유생 수용밀도, 먹이생물 종류 및 공급량, 채묘방법에 따른 성장과 생존율을 조사하였다. 일본(기수)재첩의 부유유생은 $24^{\circ}C$와 $27^{\circ}C$에서 빠른 성장을 보였으며, $18^{\circ}C$와 $21^{\circ}C$에서 50% 이상의 높은 생존율을 보임으로서 유생 사육을 위한 적정 수온은 $21-24^{\circ}C$이며, 최적수온은 $24^{\circ}C$ 이었다. 또한 염분 3 psu 이상에서 성장과 생존이 가능하였으나 적정 염분은 6-9 psu 이었다. 유생밀도별 사육시험에서 1 ml당 1-10 개체에서 높은 성장과 생존율을 보였으나 경제성을 고려한 적정 유생사육 밀도는 1 ml당 10 개체였다. 먹이생물에 따른 유생의 성장과 생존율은 Isochrysis galbana, Pavlova lutheri 및 Chaetoceros calcitrans를 혼합하여 10,000-20,000 cells/ml의 밀도로 공급하는 것이 가장 효과적이었다. 성숙유생의 채묘는 모래저질에서 성장과 생존율이 유의하게 효과적이었으며, 특히 0.25 mm 이하의 미세사질에서 높은 생존율을 보였다. In order to know the effects of rearing conditions such as water temperature, salinity, larval stocking density, kinds and amounts of food organism and seedling collection method on seedling production of the brackish water clam, Corbicula japonica, the growth and survival rate of the larvae were investigated at each rearing condition. The shell length of larvae showed faster growth at $24^{\circ}C$ and $27^{\circ}C$, and survival rate showed good results at $18^{\circ}C$ and $21^{\circ}C$. Based on growth and survival rate according to water temperature, the optimal water temperature for larvae rearing was $24^{\circ}C$. At the salinity of more than 3 psu, the growth and survival rate were higher than 0 psu. The optimal salinities for larvae were 6-9 psu. Growth and survival rate of larvae were high at low stocking density and the optimum stocking density of larvae was 10 inds./ml. Daily feeding concentrations of 10,000-20,000 cell/ml of food organisms mixed Pavolva lutheri, Isochrysis galbana and Chaetoceros calcitrans were very effective. Full grown larvae collection from various substratum was significantly higt in sand, especially sand size was less than 0.25 mm.

농림수산 자금지원의 기능적 분석, 1970~80

이정용 한국농촌경제연구원 1982 농촌경제 Vol.5 No.4

소아 진정 중 사고는 왜 생기는 걸까요?

이정용 대한응급의학회 2022 대한응급의학회 학술대회초록집 Vol.2022 No.1