단위계 변화에 따른 차원과 수치 전환

조창범,강동식,강정우 濟州大學校 師範大學 科學敎育硏究所 1994 科學敎育 Vol.11 No.1

We extended the matrix method and the factor method which are used to convert unit systems and found the method which is useful to convert dimensions, numerical values the other unit system. The conversion method of dimension converts dimensions of the known unit system to those of the unit system which we wish to know by means of doing the product of the conversion matrix which is found out the corresponding relations of the fundamental quantity by the column matrix of dimension of the known unit systems. Using this method, the SI units are converted to Gaussian, esu, emu units and conversely esu, emu units are converted to SI units. However, the matrix method could not convert dimensions from Gaus-sian units to SI units. The conversion matrix of numerical value which is used to change numerical values from SI units to Gaussian units is found out from the corresponding relation of basic units. Besides some exceptional cases, we knew the relation of numerical values of the various units system.

촉매습식산화공정을 이용한 난분해성 염색폐수처리에 관한 연구

조정식,김영석 광주대학교 1998 産業技術硏究 Vol.10 No.-

CuSO4 촉매를 이용한 습식산화법에 의하여 고농도로 여러 종류의 유기화합물을 함유하는 생물학적 난분해성 염색폐수를 처리하는 실험을 수행하여 다음과 같은 결과를 얻을 수 있었다. 반응온도 220℃와 압력 100atm의 조건하에서 30분정도 반응시킴에 의하여 80% 이상의 TOC제거효율을 얻을 수 있었다. 촉매습식산화공정에서 온도는 중요한 조작변수임을 확인할 수 있었으며, 본 연구와 같이 CuSO_4 촉매를 이용한 습식산화법에 있어서는 반응온도가 220℃를 넘어서면 TOC제거효율에 그다지 큰 영향을 미치지는 못하였다. 반응속도식은 두단계의 1차반응식으로 잘 표현될 수 있음을 알 수 있었으며, 각 단계에서의속도상수는 온도와 촉매첨가량에 크게 영향을 받음을 알 수 있었다. 속도상수의 온도의존성을 Arrhenius식으로 표현한 결과 활성화에너지가 첫단계에서는 46.6kJ/mol, 둘째 단계에서는 19.1kJ/mol임을 알 수 있었다. 본 연구와 같은 촉매습식산화공정에서 촉매투여량을 고려한 총괄 반응속도 모델은 다음 식으로 나타낼 수 있었으며, 촉매투여량 의존 차수 m은 첫단계에서는 0.518, 둘째 단계에서는 0.370임을 알 수 있었다. In(C/C_0)=k_3W^mEXP(-ΔE/RT) Catalytic(CuSO4) wet-air oxidation(WAO) of refractive dye wastewater containing high concentration of various organic compounds was investigated. Experimental results indicated that over 80% reduction of Total Organic Carbon(TOC) concentration of the wastewater can be achieved in 30min of WAO treatment operating at 220℃ and 100atm. Temperature was observed to be an important control variable of the catalytic WAO treatment process. But at a temperature above 220℃, the TOC removal enhancement of the present catalytic(CuSO4) WAO process became less important. The catalytic WAO treatment was found to be represented reasonably well by two-stage, first-order kinetics. The reaction rate coefficients for both stages of reaction were observed to be highly temperature and catalyst dosage dependent. As the result of representation of the Arrhenius equation on the temperature dependent rate coefficients, it was found that the activated energy in first stage was 46.6kJ/mol and in secondt stage 19.1kJ/mol. The overall rate kinetic model for the present catalytic WAO process could be represented as In(C/C_0)=k_3W^mEXP(-ΔE/RT) The order of catalyst dosage dependence(m) in first stage was 0.518 and in secondt stage 0.370.

아임계 및 초임계수증기 분위기에서 리그닌의 액화

조정식 광주대학교 산업기술연구소 1995 産業技術硏究 Vol.5 No.-

회분식 튜브형태의 반응기를 이용하여 아임계 및 초임계수증기 분위기에서 리그닌시료의 액화와 아르곤 분위기에서 열분해를 행하였다. 반응온도 674K에서 열분해보다 초임계수증기분위기에서 훨씬 높은 오일수율을 얻었고, 오일수율은 반응온도, 반응시간, 물의 밀도 및 첨가물(CO, Na2CO3, HCl)에 영향을 받았다. UV곡선으로 부터 비교적 긴 반응시간에서 오일의 메톡시그룹이 분해됨을 알았으며, 아세틸환 전후의 오일에 대한 IR곡선으로 부터 초임계수증기 분위기에서 리그닌의 가스분해 반응을 확인하였다. Liquefaction of lignin samples at the atmosphere of subcritical and supercritical water as well as pyrolysis in an argon atmosphere was carried out using a batch tube-type reactor. At reaction temperature 674K, much higher oil yields were obtained with supercritical water than with pyrolysis. Oil yield was affected by reaction temperature, reaction time, water density and additives(CO, Na2CO3, HCl). UV spectra shows that methoxyl groups of the oil were decomposed at relatively long reaction times. It was identified from IR spectra of pre-and post-acetylation for the oil that yje lignin was reacted by hydrolysis at the atmosphere of supercritical water.

초임계 이산화탄소를 이용한 에탄올 농축공정의 최적 추출조건에 관한 연구 (Ⅱ)

조정식 광주대학교 1997 産業技術硏究 Vol.8 No.-

앞 연구[9]에서 얻어진 CO2-C2H5OH-H2O계에 대한 고압기액 평형 실험치와 Wilson 혼합규칙[10]을 사용한 Patel-Teja상태방정식[11]으로부터 얻어진 계산치를 이용하여, 저농도 수용액으로부터 무수에탄올 농축을 달성하기 위한 공정의 최적 추출조건을 검토하였다. 그 결과 12.0MPa의 등압하에서 추출탑의 추출 경우, 에탄올 저농도영역에서는 323.2K이 적합하고 에탄올 고농도영역에서는 363.2K이 적합하여 연속적으로 온도를 증가시키는 것이 최적 추출조건임을 알 수 있었다. This study was investigated the optimum ethanol extraction condition for obtaining the concentration dehydrated ethanol from dilute aqueous solutions. The result was obtained from the experimental high pressure vapor-liquid equilibria data for CO2-C2H5OH-H2O system performed the priminary study[9] and the calculated data using the Patel-Teja equation of state[11] with Wilson type mixing rule[10]. It was found that the optimum ethanol extraction condition in the extraction column was examined to be a temperature in the range of 323.2K through 363.2K and a pressure of 12MPa, with the temperature increasing as the ethanol concentration in the liquid phase increases.

초임계 이산화탄소를 이용한 에탄올 농축공정의 최적 추출조건에 관한 연구(Ⅰ) : Patel-Teja 상태방정식에의 혼합규칙 적용 Application of Mixing Rules in P-T EOS

조정식 광주대학교 1996 産業技術硏究 Vol.7 No.-

초임계 유체상과 액상 모두를 계속해서 순환시키는 circulation type의 고압 상평형장치를 이용하여, 313.2∼343.2K/9.05∼18.5MPa의 조건에서 CO2-C2H5OH-H2O계에 대한 고압 기액평형 측정을 수행하였다. 에탄올 농축공정의 최적 추출조건을 결정하기 위하여 에탄올의 물에 대한 분리계수 및 초임계 유체상으로의 에탄올 용해도 관계를 조사한 결과, Adachi-Sugie 혼합규칙을 사용한 Patel-Teja식에 적용한 경우 보다는 Wilson 혼합규칙을 사용한 경우가 실험치에 유사한 경향을 나타내었다. 또한 최적 추출조건은 323.2K일 때 약 12MPa, 333.2K일 때 약 13MPa, 343.2K일 때 약 14MPa임을 알 수 있었으며, 이 추출조건은 Wilson 혼합규칙에 의한 계산값과 유사한 결과를 보였다. A series of experiments was performed to measure the phase equilibria of CO2-C2H5OH-H2O system at 313.2∼343.2K/9.05∼18.5MPa using a circulation type of apparatus in which both vapor and liquid phase were continuously recirculated. In the realtionships between saparation factor(ethanol to water) and ethanol solubility in the supercritical fluid phase, the Patel-Teja equation of state with Adachi-Sugie mixing rule predicted the experimental data better than the same equation of state with Wilson type mixing rule. The optimum extraction conditions were ca.12MPa at 323.2K, ca.13MPa at 333.2K and ca.14MPa at 343.2K and those experimental results were similarily represented with calculated values using Wilson mixing rule.

FOPS(Film on Porous Silicon)를 이용한 ZnO 에어브리지의 제작

허정준,류인식,심준환,조찬섭,이종현 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1

Micromachining technique by FOPS(Film on Porous Silicon) method using ZnO thin film was studied to fabricate ZnO air-bridge type microstructures. Porous silicon was formed selectively in n^(+)-diffused region of (100) oriented silicon substrate by anodic reaction in 20 wt% HF solution. ZnO thin film was deposited on the porous silicon layer by RF magnetron sputtering and then pattern was defined by standard photolithography. Finally, porous silicon was etched away in 5 wt% NaOH solution. The fabricated ZnO microstructures have 20μm width, 40μm thickness and microstructure was cleanly formed on the cavity. Also, microstructure of arbitrary shape was fabricated.

토마토 품종간의 오존 감수성 비교

구자형,원동찬,조정희,신대식 忠南大學校 環境問題硏究所 1998 環境硏究 Vol.16 No.-

Seven cultivars of tomato were exposed to 0.15μL/L ozone for 20 hours to determine differences in sensitivity. Based upon the degree of foliar injury, the highest degree of sensitive cultivars were 'Daehyongboksu' and 'Goangsu'. Four cultivars, 'Goangmyong', 'Pungyoung' and 'Pinkglory' including 'Pinkforcer' were separated into intermediate sensitive group. 'Neabyongjangsu' was the least sensitive of the 7 tomato cultivars tested. The degrees of ethylene production and epinasty of leaves were relatively consistent with the differences of sensitivity to ozone. However, stomatal and trichome density, transpiration rate, and activities of peroxidase and superoxide dismutase were not clearly related to the ozone sensitivity of cultivars.

동종 조혈모세포이식 후 발생한 크립토콕쿠스 척추염 1예

고윤호,임동준,이성수,조유경,이동건,최정현,김유진,민창기,김동욱,박정미,김춘추,신완식 대한감염학회 2001 감염 Vol.33 No.4

Skeletal cryptococcosis is an uncommon infection. Cryptococcus is a common cause of meningitis and infects 7∼10% of patients with AIDS. As well as AIDS, the infection may be seen in association with leukemia, lymphoma, Hodgkin's disease, sarcoidosis, tuberculosis and diabetes, also in patients on steroid medication. But there is no case report of skeletal cryptococcosis following allogeneic hematopoietic stem cell transplantation. A 40-year-old woman was admitted to the hospital because of low back pain. She had chronic myelogenous leukemia for 2 years and underwent allogeneic hematopoietic stem cell transplantation 8 months ago. She have been treated with steroid and cyclosporine orally because of chronic graft versus host disease. On examination she was afebrile and had posterior lower lumbar tenderness. But, she had no reduced strength of low extremities. Open biopsy was underwent. Histology demonstrated budding, round-to-oval, refractile yeast-like organisms within debris. The results of a lumbar puncture were unremarkable and cerebrospinal fluid culture failed to grow bacteria and yeast. The patient was treated with amphotericin B (1 gram) and AmBisome□ (2.8 gram) over 6 weeks. Three months after cessation of therapy, the patient was doing well.(Korean J Infect Dis 33:298∼301, 2001)

Articles : Characteristics of Y1Ba2Cu3O(7-x) High-Tc Superconductor Prepared by Partial Melting Process

( Jeong Shik Park ),( Young Soon Kim ),( Suk Woo Yang ),( Ik Joon Cho ),( Chun Yeong Kim ),( Hyung Shik Shin ) 한국화학공학회 1998 Korean Journal of Chemical Engineering Vol.15 No.3

연구원 활동 : 발표논문요약 < 화학공학분야 >

(Jeong Shik Cho),(Kyong Rok Lee),(Jong Sung Lim),(Jae Duck Kim),(Dae Ki Choi),(Youn Yong Lee),(Hai Soo Chun) 고려대학교 공학기술연구소 1994 공학기술연구소보 Vol.1 No.-