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조익준 順天靑巖大學 1994 論文集-順天靑巖大學 Vol.18 No.-
화학증착법으로 890℃에서 SrTiO_3(100) 기판에 제조한 90K-YBa_2Cu_3O_6+x 박막을 10^-4 Torr의 진공 상태에서 10분 동안 1keV - Ar^+ 이온으로 조사하였을 때, 지금까지 보고된 중성자, 전자, X-선 및 γ-선 등이 고온초전도체에 미치는 영향에 대한 연구결과와는 다르게, 이온조사 이전의 시료보다 전이온도가 오히려 증가하였다. 또한 XPS 스펙트럼에서 Cu-스펙트럼 크게 변하였으며, 이것은 이온조사에 의해 초전도체의 Cu의 원자가가 변하였음을 의미한다. The 90K-Y123 thin films were prepared by Chemcal Vapor Deposion on SrTiO3 (100) substrates at 890℃. The effects of irradiation, Ar^+1 ion beam (1keV), of the high-T_c superconductor YBa_2Cu_3O_6+x(Y123) has been studied by Ac-four prove technique, X-ray diffraction method, and X-ray phothoelectron spectroscopy measurements. The ion beam irradiation slightly increased T-c of YBa_2Cu_3O_6+3. Changes in the Cu2p satellite emission were observed.
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서울지역 대기오염과 급성관상동맥증후군 환자의 흉통 발생의 관계에 대한 연구
조익준,신중호,정성구,서길준,이중의,정연권,이창현,윤여규 대한응급의학회 2002 대한응급의학회지 Vol.13 No.3
Purpose: There have been some studies on the hazardous effects of air pollution for patients with cardiovascular diseases. This study was designed to evaluate the possible relationship between air pollution and development of chest pain in acute coronary syndrome patients. Methods: The medical records of 109 acute coronary syndrome patients, who visited two university hospital emergency rooms in the Seoul area between January 1999 and July 2001, were reviewed. Hourly concentrations of particulate mass< 10 μm and of four gaseous air pollutants were measured at 19 different points in the Seoul area. The data were analyzed using a case-crossover approach. Results: The analysis of the data showed no definite relationship between chest pain development and either the concentrations of particulate mass<10 μm(PM_10) or of four gaseous air pollutants; namely, carbon monoxide (CO), nitrogen dioxide(NO₂), ozone (O₃), and sulfur dioxide (SO₂). However, increases in the concentrations of particulate matter, gaseous NO₂and gaseous O₃showed a positive correlation, but without statistical significance. Conclusion: This study shows no relationship between the concentrations of PM10 and other air pollutants with the development of chest pain in acute coronary syndrome patients. However, for particulate mass<2.5μm, which is currently not measured in the Seoul area, the possibility of a relationship between development of chest pain in acute coronary syndrome patients and particulate air pollutants still exists.
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CVD 법에 의한 Y - Ba - Cu - O 고온초전도 박막의 제조와 열처리에 따른 특성변화
조익준,신형식 ( Ik Joon Cho,Hyung Shik Shin ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.1
The 91 K(T_(c, onset), △T_c=2K) Y-Ba-Cu-O thin films were prepared by CVD method on SrTiO₃(100) substrates at 890℃ using β-diketonate chelate compounds of Y(thd)₃, Ba(thd)₂ and Cu(thd)₂ as source materials. The characteristic changes such as T_c, crystallinity, and XPS core spectra due to oxygen out-and in-diffusion induced by heat treatment were measured by use of AC-four prove technique, XRD and SEM. We have analyzed the spectral changes observed in the XPS core spectra of Y 3d, Ba 3d_(5/2), Cu 2p_(3/2) and O 1s before and after heating Y-Ba-Cu-O films. The experimental results showed that T_c, crystal structure, and core-level line shape of the elements in the probed surface region were influenced by the oxygen content, which varied by heating in Ar or O₂ atmosphere. It is likely that the observed spectral changes are related to the oxygen deficiency as well as to the film quality and extrinsic contamination of the surface.
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병원 입원 방침 등의 개정을 통한 응급실 환자 체류시간 단축: 1개 지역응급의료센터 경험
조익준,정연권,이중의,송근정,심민섭,신태건 대한응급의학회 2015 대한응급의학회 학술대회초록집 Vol.2015 No.2
Introduction: 응급실의 혼잡 및 과밀화는 대도시 대형병원 응급실의 가장 우선적 시정 과제이다. 여러 노력들로 혼잡 및 과밀화가 약간씩의 호전을 보인 경우도 있으나, 전반적으로 해결을 한 경우는 없었다. 메르스 환자 집단 발생을 경험한, 1개 지역응급의료센터에서 응급 환자 진료 및 병원 전체 입원 등의 방침을 수정하여 효율적인 응급실 과밀화 해소를 경험하여 그 내용을 보고 하고자 한다. Material & Methods: 연평균 7만여명의 환자를 보는 1개 지역응급의료센터에서 입원환자의 우선 순위 개선, 각 진료과의 환자 진료 시간 조정(30분내 대면진료, 2시간 내 입/퇴원 결정, 6시간 내 실제 입/퇴원 실시), 외래 환자 응급실 이용 제한 등의 진료규정을 개정하였다. 진료 개정 이후 기간의 일평균 환자수, 입원환자 응급실 체류시간, 귀가환자 응급실 체류시간, 전체 환자 응급실 체류 시간을 1년전 동기간 및 진료 개정 이전 3개월 동안의 수치와 비교를 하였다. Conclusion: 비교적 짧은 기간(46일) 동안의 결과이기는 하지만, 병원 전체 정책을 수정함으로 만성적으로 지속되던 응급실 혼잡 및 과밀화 현상을 응급실 환자 체류시간의 단축을 통해 해결할 수 있었다.
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활성탄소섬유에 의한 색도제거에 관한 연구 : 위생매립장에서 화학적으로 처리한 침출수를 대상으로
조익준 順天靑巖大學 1998 論文集-順天靑巖大學 Vol.22 No.2
The activated carbon fiber(ACF) was used to remove color of leachate in sanitary landfill. Leachate treated with polymer coagulant was employed as the samples for the present with polymer coagulant was employed as the samples for the present study. The average COD_Mn of the samples was 117.8 mg/ℓ and the color was 300 degree, which was measured by use of light transmittancy in the range of 400~650nm. The physical properties of ACF were measured in terms of BET sufrace area and average pore-size, and its values were respectively 1465㎡/g, 14 A°. Experimental results of color removal test in the present study show that color substances adsorption by ACF if influenced by the BET surface area and pore size distribution of adsorbent. When 100㎖ of the sample was passed through the adsorption column packed with 1.5g of ACF, removal rate of organics determined by COD was 84.1%, and color degree decreased from 300 to 56 providing a 81.3% color removal. The results shows that COD is correlative to the color degree. At pH 11, there was much more removal than at pH 3. The alkaline pH value for color removal is much significant because that of landfill leachate is in the range of 8~11. The results showed that adsorption treatment by ACF could be practically effective on the color removal to satisfy the 200 color degree of the legal standards. But the processed and costs of adsorption treatment by use of ACF should be broadly discussed.
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발화합성법으로 제조한 Y계 고온초전도체의 특성에 관한 연구
조익준 順天靑巖大學 1997 論文集-順天靑巖大學 Vol.21 No.2
Since the discovery of high critical temperature superconductors, many other fabrication methods have been developed. In this paper High -Tc Superconductors YBa_2Cu_3O_7-x were prepared by pyrophoric synthesis method as it was reported that it had the advantage of homogeneous mixing in liquid phase through the chemical reaction and it was possible to prepare fine powder below 1 ㎛ using Y_2O_3, BaCO_3 and CuO powder. To investigate characteristics of the specimens the particle size distribution, crytal structure, surface morphology, critical transition temperature(Tc), and levitation force(F_L) were determined by various analyzers such as SEM, XRD, Particle Sizer, and Ac-four point prove method. The experimental results can be summerized as follows: particle size of the fine black brownish powder with a very low density through phrophoric synthesis method was submicron bellow 0.4㎛. Tc over 92K observed in the samples by phrophoric synthesis method indicated a somewhat similar value comparing to that of specimen by the conventional solid reaction method. However levitation force showed a low value comparing to that of the solid-reaction method.
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