관동맥질환에서 저밀도 지단백 입자 크기의 분포

임효영,김인숙,승기배,강동헌,전두수,장기육,박준철,이수영,홍순조,최규보 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.8

계면활성제의 체인길이에 따른 구형 MCM-41의 합성

이두형,최병열,장원철,서길수,이태진 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.1

Mesoporous MCM-41 exibits a hexagonal arrangement of uniform mesopores whose dimensions may be engineered in the range of ∼20Å to greater than 100Å. The MCM-41 typically have high surface areas above 1000m2/g, and then capacities of MCM-41 to accommodate the larger hydrocarbon is still higher than the general molecular sieve. At the present, many surfactants as organic templates have been proposed for various formations of these MCM-41. In this study, we synthesized mesoporous MCM-41 which has a spherically hexagonal structure. Also, the pore size of MCM-41 could be changed by the control of alkyl chain length of surfactants.

윤곽선 추출 및 부영상 분할을 이용한 프랙탈 영상 압축에 관한 연구

박철우,최환언,조철효,김순백,김두영 東亞大學校 附設 情報通信硏究所 1995 情報通信硏究所論文誌 Vol.3 No.1

This paper suggests the method to shorten the search area by using edge detection and subimage partition. For the purpose reduce encoding time, The Domain areas are reduced 1/64 by partitioning original image to subimage, and classified them into edge area and shade area to that detect only the area in the same class. for achieving an encoding with good fidelity, tried to differ the search method as the threshold value of edge which is included in subimage, and compared the compression rate and fidelity when set the size of range block as 4×4 and 8×8.

알카리토금속-희토류 원소 화합물 산화막으로 형성된 AC-PDP 보호막의 특성연구

양두훈,김두철,최치규 濟州大學校 基礎科學硏究所 2000 基礎科學硏究 Vol.13 No.1

MgO and Ba_(0.6)Sr_(0.4)Gd₂O₄films were deposited on Si(100), soda-lime glass and PDP's test panel substrates by using e-beam vapor deposition. Ba_(0.6)Sr_(0.4)Gd₂O₄ powder for e-beam evaporator source was prepared by sintering a mixture of BaO, SrO and Gd₂O₄ powder at a molar ratio of 0.6 : 0.4 : 1 at 1200℃ for 12 hours in air. The Crystalline and chemical shift of electron orbital binding energy of the MgO and Ba_(0.6)Sr_(0.4)Gd₂O₄ films are investigated by X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). And we have analyzed the secondary electron emission coefficient (γ₄) of films. The secondary electron emission coefficient (γ₁) of Ba_(0.6)Sr_(0.4)Gd₂O₄ film is higher than that of MgO film. A firing and the sustain voltage of MgO film are lower than that of Ba_(0.6)Sr_(0.4)Gd₂O₄ by 7 V, 8.8 V respectively. The luminance efficiency of Ba_(0.6)Sr_(0.4)Gd₂O₄film is better than of MgO film with 0.66 lm/W. MgO and Ba_(0.6)Sr_(0.4)Gd₂O₄films showed good transmittance properties within the visual range.

ZnSe-ZnS : Mn 직류 박막형 전자발광 소자의 제작 및 특성조사

洪性樂,崔致圭,金斗哲,玄東杰 제주대학교 1988 논문집 Vol.27 No.-

A ZnSe-ZnS : Mn dc thin flim electroluminescene device was fabricated electron beam evaporation method and investigated the charcteristics. The brightness-voltage characteristics for dc operation were measured . The threshold voltage was 32V and at 60V the maximum brightness was 95fL. The brightness depending on the layer thickness of thin flim increased and a brightness tended to saturate above 8000A and the optimum temperature of substrate was 200-230℃. The spectrum of this device had a maximum intenty at wavelength 585nm.

백서 간재생중 H2B Histone 유전자 발현에 대한 Octamer Binding Transcription Factor의 역할

임규,방재웅,최두식,손미영,이영철,박청,김태동,김영래,박종일,윤완희,박승길,황병두 한국노화학회 2001 한국노화학회지 Vol.11 No.1

정신분열병의 경과 중 발생하는 우울증

곽경환,박두병,최태영,민경준,이영식,기백석,나철 大韓神經精神醫學會 2002 신경정신의학 Vol.41 No.3

연구목적 : 정신분열병을 음성증상군과 양성증상군으로 나누어 두 군 사이에 우울증이 차이가 있는지를 조사하고 정신분열별의 증상과 우울증과의 연관과 정신분열병의 경과 중 보이는 우울증사의 특징에 대해서 알아보고자 하였다. 방 법 : 중앙대학병원에 입원한 총 31명(남자 13명, 여자 18명)의 정신분열병 환자를 대상으로 PANSS, BDI, HDRS와 Simpson Angus Scale을 시행하였다. 결 과 : 1) BDI 21점 이상을 기준으로 했을 때, 정신분열병의 경과 중 우울증이 발생한 환자는 총 18%였으며, 양성증상군과 음성증상군 간에 차이는 없었다. 2) 양성증상군과 음성증상군 간에 BDI, HDRS 그리고 PANSS-D 등의 점수의 차이는 없었다. 3) 주관척도인 BDI와 객관척도인 HDRS와 PANSS-D 사이의 연관은 없었다. 결 론 : 정신분열병의 우울증은 양성증상이나 음성증상의 한 부분으로 생각하기보다는 또 다른 영역으로 받아들여야 할 것으로 보인다. 임상적으로 정신분열병에서 우울증은 발생되는 비율의 정도를 고려할 대 다른 증상과 더불어 집중적인 관심이 필요하며 이와 함께 우울증으로 인한 결과와 예후의 심각성을 고려할 때 우울증에 대한 인식 및 진단과 치료에 더 많은 진전이 있어야 한다. Objective : The heterogeneity of symptomatology within the group of schizophrenias is still a major obstacle for defining clinically useful subgroups of these disorders. One of these symptoms is depression. Recently there is a growing evidence suggesting that depressive symptoms and related mood disturbances are important in treating schizophrenia. This so because of the improvement of such side effects as extraphramidal symptoms with increasing use of atypical antipsychotics. Althought depression is known to be a serious problems of many schizophrenic patients, the nature and course of depression in schizophrenia remain unknown. Methods : The author examined the depressive features in 31 patients with schizophrenia. Rating on the PANSS, BDI and HDRS were obtained. Eighteen percent of the total patients had BDI score above 21, considered depressed. Results : There were no difference in BDI, hDRS and PANSS-D between positive symptoms group and negative synptom group. There was also no correlation between subject scale(BDI) and objective scales(HDRS, PANSS-D). Conclusions : Depression in schizophrenia needs intensive studies. It is also considered as another hereogeneous domain beside negative or positive symptom domain. Out of respect for the high prevalence and serious outcome of depression in schizophrenia, a more differentiated assessment, analysis, and treatment of depressive symptom is recommended.

니페디핀이 암피실린의 흡수에 미치는 영향

정현정,용철순,최윤수,오두만 영남대학교 약품개발연구소 1997 영남대학교 약품개발연구소 연구업적집 Vol.7 No.-

Amino-β-lactam antibiotics are absorbed by the dipeptide transporter in the small intestine. These uptakes are coupled to a proton influx. The inward proton gradient is partly induced by the Na^(+)/H^(+) exchanger and cakium ion is involved in control of this antiport. Interaction between ampicillin which is one of the amino-β-lactam antibiotics and nifedipine which is one of calcium channel blocking agents was studied in rats in vivo and with rabbit jejunum mounted on the Sweetana/Grass diffusion cells in vitro. Bioavailability of ampicillin was increased significantly when nifedipine was co-administered orally in rats. There were no differences in the distribution phase and the elimination phase when ampicillin was given either alone or with nifedipine intravenously. Conditions for in vitro experiments were determined. The lift rate of O₂/CO₂ gas was controlled to 3 bubbles/sec and ampicillin was stable in the Kreb's buffer at pH6.0 Absorption of ampicillin was the greatest when the completely-stripped serosal membrane was used. Transport of ampicillin from mucosal to serosal side in the rabbit jejunum was enhanced by 32% in the presence of nifedipine (p=0.059). Above results suggest that nifedipine might increase the plasma level of ampicillin via the improved absorption in the intestine rather than the reduction in the elimination or/and alteration in the distribution.

이온주입이 금속의 일함수에 미치는 영향(Ⅰ)

김현경,강석태,황정남,이철주,최대선,정병두 연세대학교 자연과학연구소 1984 學術論文集 Vol.13 No.-

이온 주입이 일함수 차이에 미치는 영향을 연구하기 위하여 낮은 에너지 이온 가속기, 전자총과 기타 일함수 차이를 측정하기 위한 장치를 설계, 제작하였다. 제작된 이온 가속기의 집속 특성은 이론적인 값과 일치하였다. 즉, 집속 렌즈의 확대율이 이론값은 2.0인데 비하여 1.2로 상당히 작은 값이었다. 또한 집속 렌즈의 전압 V_L과 추출 전압 V_e에 의한 집속 특성 역시 이론값과 매우 잘 일치하였다 . 제작된 장치를 사용하여 다결정 Cu와 Ni의 일함수 차이를 측정한 결과 0.45eV임을 알았다. 그리고 전자선을 이용하여 억제 전위차로 일함수를 측정할때 입사 전자의 반사율을 고려해야 함을 알았다. Low energy ion accelerator, electron gun, and apparatus for measuring work function difference are designed and constructed in order to study the effect of ion implantation on the work function. The focusing properties of accelerator is coincided with theoretical results; the magnification of Einzel lens is found to be 1.2, while theoretical value is 2.0, and the focal properties as a function of V_L/V_e are in good agreement with theory. Using these systems, the work function difference between polycrystalline Cu and Ni is found to be 0.45eV, and the experimental retarding potential plots indicate close agreement with the theoretical values modified by electron reflection.

Ruled Surface로 형성된 임펠러 블레이드 전용 CAD/CAM 시스템 개발 Ⅰ : 모델링에 관한 연구 A Study on the Modeling

조현덕,정대일,윤문철,최두선,신보성,이응숙,董玉革 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.6

We have developed the exclusive CAD/CAM system for the machining of impeller blades. This study is about the modeling method for the effective machining of impeller blades formed by ruled surface. As the impeller is consisted of boss part and blade part, the boss is modeled by rotational surface of hub curve on z-axis and the blade is described by ruled-surfaces between hub curve and shroud curve. This modeling process can be carried out on the software developed in this study. And, the developed software can describe the impeller as a solid model through interface with Solid-Works software. The developed software containing the interface method proposed in this study was very effective for impeller modeling.