인체 체액내 황색포도상구균의 증식과 철 획득 기전

신성희,이강길,이명희,양남웅,임용,김진호 대한감염학회 2000 감염 Vol.32 No.5

초정밀 나노 분급기 개발에 관한 연구

성백섭,윤길하,차용훈 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-

Nanotechnology is the creation and utilization of materials, devices, and systems through the control of matter on the nanometer-length scale, that is, at the level of atoms, molecules, and supramolecular structures. The essence of nanotechnology is the ability to work at these levels to generate larger structures with fundamentally new molecular organization. These nanostructures, made with building blocks understood from first principles, are the smallest human-made objects, and they exhibit novel physical, chemical, and biological properties and phenomena. The aim of nanotechnology is to learn to exploit these properties and efficiently manufacture and employ the structures. Control of matter on the nanoscale already plays an important role in scientific disciplines as diverse as physics, chemistry, materials science, biology, medicine, engineering, and computer simulation. This paper describes the superprecision nano separator to productive particle size of nano powder, this separator system is very important in the industrial area for other high technology parts.

단순 스무딩 스플라인 함수 추정

강상길,이우동,윤용화,김종태 慶山大學校 基礎科學硏究所 1998 基礎科學 Vol.2 No.1

본 논문의 목적은 선형 스무딩 스플라인에 대한 단순하고 구체화된 형태를 제안하고, 구체화된 선형 스무딩 스플라인 형태를 통하여 스무딩 스플라인의 특성을 이해하고는 어떻게 비모수 함수 추정량의 도구로서 사용될 수 있는지를 보인다. 또한 예제를 통하여 다른 비모수적 추정량들과 비교하였다. In this paper, we give simple and closed form of linear smoothing spline. Through the form, we understand the characteristics of smoothing spline, and show that how the smoothing spline can be used as a tool for estimator of nonparametric functin. And an example is given for comparison of our esttimator with another nonparametric estimators.

FeSO₄의 熱分析및 Fe₃SO₄ 生成에 관한 硏究

黃龍吉,薛秀德,成周慶 東亞大學校 1975 東亞論叢 Vol.12 No.2

500℃로 하소시킨 황산제일철을 原料로 해서 鐵黑顔料를 製造하는 實驗이다. 500℃로 하소시킨 황산제일철 용액을 수소이온농도 7∼8, 反應溫度 100℃, 空氣加壓力 3氣壓, 反應時間 2時間으로 加水分解시켜본 結果 鐵黑이 90%以上 生成되었다. The formation of black iron oxide in a calcined Iron(Ⅱ) sulfate at a temperature of 500℃ was studied in the solution at a temperature of 100℃ under 3 atmospheres. When calcined Iron (Ⅱ) sulfate was hydrolyzed under 3 atmospheres in the solution with pH range 7 to 8 for 2 hour at temperature of 100℃, 90% of iron was recovered in a form of black iron oxide.

의약품중 잔류유기용매 시험법 확립에 관한 연구

고용석,강찬순,최보경,김혜수,홍정희,최명신,김상현,장성재,김길수 식품의약품안전청 2001 식품의약품안전청 연보 Vol.5 No.-

Headspace-GC(딘5-GC)를 이용하여 ICH 잔류웅매 가이드라인 class 1, 2에 속하는 28종의 잔류유기웅매 분석방법을 연군한 결과 SPB-5, BB-WAX column을 동시 이용하여 각각을 확인, 정량할 수 있었다.또한 염의 참가효과, 평형시간,평형온도가 headspace분석에 미치는 영향을 검토한 결과 평형 시간 30분,평형온도 85℃,Na₂SO₄Ig을 첨가하여 시험할 때 최적 부넉조건을 나타내었다. 회수율은 1,1-achloroethene(68.3%)를 제외하고 90.9 ~ 114.5%로 패체적으로 양호하였다. 따로 HS-GCJECD, DB-524 column을 이용하여 9종의 잔류유기용매에 대하여 각각의 검랸선을 작성하고 검출한계를 구하였다. 실제 의약품 원료 10종및 제제 5종에 적용시킨 결과 모두 불검출되었으며 본 시험법은 의약품중의 잔류유기용매 분석에 적용할 수 있는 방법이라고 판단된다. The headspace-fC/FID(HS -GC/FID) method was performed for test method developnlent of residu;31 organic solvents in pfrarmaceuticals. Using SPB-S and BB-WAXcolumn, 28 kinds of solvents iri ICH residual sof)·ents guidetine class 1, 2 couBd be individuallt-identified and quantitated. The foIBowing residoal soIYents were not detected by the headspaceinjection condition : N,N-Cmethylacetamide, N,N-dimeth)rlformamide, ethyfeneglycol, formamide,2-methoryethanot, N-rnethylpyrrolidone, suBforane. The effects of the addition of salts,equilibration time, and equilibration temperature on headspace analt·sis were invesugated. Theoptimum conditions weiFe obtained with addtion of Ifa2s04 19 as a salt, simultaneously. thetime and temperature of equitibration were 30min and 8i'f, respectivety. The recovery havefound between 90.9 and 114.5% except 1,1-dichloroethene(fi8.3%). Using DB-624 column &HS-GC/:ECD method, 9 kinds of residual solvents could be individually identified andfuantitated. This HS-GC method can be applied to test the residua3 organic solvent in thepharmaceuticals.

石炭石과 無煙炭에 의한 밀·스케일의 還元

黃龍吉,李成龍,朴載奉 동아대학교 공과대학 부설 한국자원개발연구소 1986 硏究報告 Vol.10 No.1

Some coked anthracite and Mill Scale pellet was packed in a tube furnace. And then, the heating samples was reacted with CO₂ gas made from wasting acid. The results of the experiment of reduction and gasification were as follows. 1) When waste acid was neutralized by some lime stone, vields of CO₂ gas was attained 80%. 2) The amount of CO gas producted at 1100℃ was 1.37times the amount of CO₂ gas made from wasting acid, and 1.5 times the amount at 1300℃. 3) During 5 houre for experiment the rate of reduction was 78% at 100℃ and 97.2% at 1300℃. 4) When Mill Scale pellet was reducted into CO gas, the value of activation energy was 3154.2 ㎈/g-㏖. The following can be resulted from what mentioned above: The neutralization of waste acid by lime stone can be a preventive of water pollution. And we can product not only fuel gas by the gasification of the anthracite reacting with CO₂ gas, but also sponge iron by the reduction of Mill Scale. The above four results can serve as a base source for the production of those materials.

合成酸性, 鹽基性 Flux에 의한 鋼의 精鍊

李成龍,黃龍吉 東亞大學校 大學院 1988 大學院論文集 Vol.13 No.-

This study has been carried out to investigate into the reaction effect of fluxes with respect to various basic and acidic synthetic fluxes from the solidification and dephosphorization process at 1200℃ and 1400℃, respectively, and refining of steel with the high frequency induction furnace. The results obtained from the experiments are as follows; 1. The basic synthetic flux dispersed along solid surface while the acidic synthetic flux formed spherical drop during the solidification of melt at 1200℃. 2. The dephosphorization processes have shown that the magnetic and non-magnetic materials from the synthetic flux with 10% Fe₃P at 1400℃ were the calcium ferrite type and calcium phoshate type. respectively, and SiO₂ component of the synthetic fluxes formed the calcium ferrite, whereas the CaCl₂ and Na₂O₂ compounds formed the calcium phosphate. 3. The results fo high frequency induction melting have shown that the solution rate of synthetic flux was twice as fast as that of mixed flux in the acidic based flux and three to five times as fast as that of mixed flux in the basic based flux and therefore, the solution rate of basic based flux was twice to three times as fast as that of acid based flux.

鋼內 介在物의 Br-化合物 形成에 關하여

黃龍吉,李相允,金營三,成章鉉 東亞大學校 大學院 1980 大學院論文集 Vol.4 No.2

The results obtained from the experiment to make a comparison between thermal characteristics and chemical reactions of 10% Br-Methanol treated oxides, and inclusions and oxides in 18Cr-8Ni stainless steel can be concluded as follows; 1. It has been shown that when MnO2, Cr2O3, Fe2O3 and SiO2 are heated, they all give exothermic characteristics in the temperature range about 200 to 300℃, but they tend to be heated up endothermically in the range 300 to 900℃, except for the fact that when the reaction 3MnO2=Mn3O4+O2 occurs at 600℃, peak showing endothermic reaction is observed. 2. Specimens made by mixing some of oxides such as MnO2, SiO2, Fe2O3 and Cr2O3 and uheir complex compunds and inclusins have all produced similar reactions which are characterized by showing an exothermic for temperatures of up to approximately 300℃ and an endothermic for the temperature range 300 to 900℃. However, it is noted that some oxides containing Mn give a sharp peak which represents endothermic reaction. 3. Below 100℃ the thermal analysis curves obtained from specimens made by reacting each complex compound with 10% Br-Methanol have been shown to be similar to these for specimens not rected with 10% Br-Methanol, showing endothermic heating for temperatures from about 150 to 200℃ endothermic heating for higher temperatures than 200℃. 4. The X-ray diffraction analysis has shown that oxides such as Mn3O4 and Cr2O3 are observed from the complex compound with a ratio MnO2: Cr2O3=1:1, whereas in the case of the compound with a ratio MnO2:Cr2O3=2:1 peak for Mn3O4 only is observable without any trace for Cr2O3 on the diffraction chart. Furthermore in the compound of Fe2O3 and Cr2O3 the peak for Cr2O3 has been determined, but no peak for Fe2O3 can be found. 5. The x-ray diffraction analysis has also presented that in inclusions in steel and complex oxides extracted by using 10% Br-Methanol the inclusions give peaks for Cr2O3 only, and peaks for Mn3O4 and Cr2O3 are obtainable. Based on this observation only when inclusions in steel are extacted by using 10% Br-Methanol amorphous structure is formed by Br, but crystalline oxides are thought to be unchanged to the amorphous.

공황장애(Panic Disorder) 환자의 MMPI 및 Rorschach 반응특성 : On the Characteristics of the Responses of MMPI and Rorschach Test in Patients with Panic Disorder

민성길,이호영,김명선 大韓神經精神醫學會 1984 신경정신의학 Vol.23 No.4

As the diagnastic criteria of DSM-Ⅲ was newly established, a lot of studies have been conducted on the biological and psychological aspects of Panic Disorder, but studies using psychological tests are few. Chambless insists that the patients in this diagnostic criteria have hysterical cognitive style. Therefore, in this study, we attempted to examine the characteristics of MMPI and Rorschach of 13 Panic Disorder patients and whether these characteristics support the hysterical cognitive style. The results are as follows; a. The group mean profile of MMPI is Hs-D-Hy-Pt type (1-2-3-7 type) and the frequency of Hy type (3-type) has got the highest points. b. For Rorschach Test, the patients showed M〈ΣC and FC〈C+CF in EB, which is the major indicator of hysteria. These results suggest that our subjects of Panic Disorder patients showed typically hysterical feature.

항균성 펩타이드인 Mastoparan B의 살조효과

서정길,김찬희,배윤정,문호성,김근용,박희연,윤호동,김창훈,변대석,홍용기,박남규 한국어병학회 2003 한국어병학회지 Vol.16 No.3

Mastoparan B (MPB)는 벌독으로부터 정제된 양친매성α-helical 구조를 취하면서 14개의 아미노산 잔기로 구성된 염기성 항균성 펩타이드로서 여러 가지 생물막과 작용한다. 본 연구에서는 우리 나라 연안의 적조 (HABs, harmful algal blooms)를 일으키는 4종의 적조생물 (Alexandrium tamarense, Chattonella catenatum)에 대한 MPB의 살조효과를 조사하였다. MPB의 4종의 적조생물에 대한 살조효과는 31.3㎍/㎖에서 세포의 lysis또는 ecdysis와 같은 형태로 현미경으로 관찰할 수 있었다. 또한 MPB는 C. marina 및 C. polykridorides에 대해서 A. tamarense와 G. catenatum보다 더욱 강한 살조효과를 나타내었다. 이러한 MPB의 HABs에 대한 살조효과연구는 새로운 살조물질을 개발하기 위한 자료가 될 것으로 생각된다. Mastoparan B (MPB), an antimicrobial cationic peptide isolated from the venom of the hornet Vespa basalis, is a basic amphipathic a-helical peptide composed of fourteen amino acid residues. In this study, we have investigated the algicidal effect of MPB against hatmful algae blooms (HABs) casative Alexandrium tamarense, Chattonella marina, Cochlodinium polykrikoides and Gymnodinium catenatum. The algicidal effect of MPB showed in the concentration of 31.3 ㎍/㎖ to 500 ㎍/㎖ against 4 HAB species and observed cell lysis or cell ecdysis by microscopy. MPB reacted more sensitive to C. marina and C.polykrikoides than A. tamarense and G. catenatum. The algicidal study of MPB against HABs will provides much insight into development of new algicidal substances.