微分層回分反應器에서 高分子樹脂에 依한 클로로페놀類의 吸着擧動에 關한 硏究 : Ⅱ. 吸着速度論 Ⅱ. Adsorption Kinetics

黃尙勉,鄭在灌 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.1

In this study, p-chlorophenol and 2,4-dichlorophenol adsorption kinetics in a differential column batch reactor was investigated using a nonionic polymeric resin, XAD-4, which has macroreticular structure and was manufactured by Rohm and Haas Co.. The results obtained from the tests were as follows: Adsorption kinetic tests employing XAD-4 resin in a diffenential column batch reactor were carried out at the flow rate greater than 841.1 ml/min for p-chlorophenol and 1021.5 ml/min for 2,4-dichlorophenol where the film diffusion resistance was minimized and homogeneous surface diffusion model was applied to the resulting experimental data in order to predict adsorbate behavior. Adsorption behavior for p-chlorophenol and 2,4-dichlorophenol was successfully predicted with the deviation less than 2% and 4% for the respective overall experimental data.

2단계 소결법이 ZrO₂/Na Naβ"-alumina 복합재료의 기계적 성질에 미치는 영향에 관한 연구

박상면 한국항공대학교 1993 論文集 Vol.31 No.-

전기자동차에 이용 가능한 Na/S 2차 전지의 충전속도 및 수명은 축전지 소재로 쓰이는 β"-alumina 고체 전해질의 파괴인성 및 그 강도에 좌우된다. 따라서 본 실험에서는 β"-alumina의 파괴인성을 증가시키기 위한 방법으로 15vol% ZrO₂를 첨가하였으며, 2단계 소결법을 사용하여 1620℃에서 20분간 소결한 후 1475℃에서 30분에서 240분간에 걸쳐 어닐링하였을 때 이 소결법이 시편의 미세구조 및 파괴인성에 미치는 영향을 연구하였다. 시편의 ??값은 압흔 시험법을 이용하여 산출하였다. 본 실험에 의하면 ?? 값은 어닐링 시간에 따라 점차 증가하였으며 최고 3.31MPa??를 나타냈다. 이것은 순수한 Na β"-alumna 입자의 성장을 억제한다는 것을 관찰했으며 시편의 파괴인성의 증가는 입계에 존재하는 ZrO₂에 의해 비정상적으로 큰 Na β"-alumna 입자가 효과적으로 제거되었기 때문이라고 생각한다. The life Na/S cell, for the future ekectric veghicles, is often limited by the fracture toughness and/or mechanical strength of Na β"-alumina solid electrolyte. In this study 2-stage sintering process, sintering at 1620℃, was used to fabricate 15vol% ZrO₂/Na β"-alumina composites. Effects of this sintering process on the microstructure and fracture toughness were investigated. ?? values determined using the indentation technique, were was increased for the specimens annealed longer than 120 min at 1475℃. Maximum ?? value was 3.31 MPa ??, which shows 43% increase compared to pure Na β"-alumna effectively. Improved fracture toughness of the ??/Na β"-alumna compsite is thought to be resulted by the effective elimination of the exaggerated Na β"-alumna grains.

α-Amylase 高生産 菌株에 의한 液化型 α-Amylase의 精製

黃尙勉,金廣 東亞大學校 1991 東亞論叢 Vol.28 No.1

Bacterial α-Amylase of Bacillus natto which is liquefying type from the specificity is one of the in-dustrially important enzymes and utilized in various fields. Bacillus natto IAM 1212 produced about 4,500-5,000 units/ml of liquefying α-amylase in oatmeal culture medium. The α-amylase was purified from cell-free medium by ammonium sulfate precipitation, dialysis of the crude enzyme in Tris-Hcl-Ca buffer of pH 7.5,gel filtration on Bio Gel P-100 and CM-cel-lulose columns, DEAE-Sephadex A-50 column chromatography and the pooled elutes were lyophili-zed. The final purification was accomplished by electrophoresis on the preparative polyacrylamide gels. The α-amylase was purified into nearly a pure state(98.7%). The optimum pH for the enzyme reac-tion was 6.8 at 37˚C. The α-amylase was stable within the range from pH 4.5 to 9.0 ad kept it activity at 37℃. The molecular weight of the purified α-amylase was 34,000. With soluble starch as substrate, the Km value of B.natto α-amylase was 0.83mg/ml. It was known that B.natto α-amylase hydrolyzed maltooligosaccharides to produce more maltose and maltotriose than glucose.

건축 외벽용 유기 용제형 및 수성 발수제의 성능 분석

서상교,정면화 충북대학교 건설기술연구소 2003 建設技術論文集 Vol.22 No.2

As solvent-based water repellents need organic solvents that are highly flammable for dilution, the operators may exposed to danger and inhalation and it may cause environmental issues as well due to the emission of organic solvents. This research aims to evaluate the properties of solvent-based and water-based water repellents, to analyze the results and to see the possibility that water-based material can substitute for solvent-based water repellents. The comparison experiments show that there are no big properties differences between water-based and solvent-based water repellents in all performances tested in this research except penetration. In conclusion, water-based water repellents can come up with the solvent-based products in water absorption rate, efflorescence resistivity and water vapor transmission, but is required to improve the penetration. However, the results say that water-based water repellents can replace solvent-based material. For the healthy living environment and the lifetime retention of building, the water permeation to building inside should be prevented and the water generated or permeated in the buildings should be evaporated atmosphere as soon as possible. Generally, the waterproof material like asphalt or paint film can repel water, but they can't expel the water generated inside properly. To prevent the ingress of moisture and water from the outside without suppressing the outward transport of moisture formed inside of building, many silicone-based water repellents are used worldwide and the volume of their consumption is increasing rapidly.

쌀과 전분을 이용한 증류식 소주의 급수 변화에 따른 수율 및 향미 연구

배상면,정수연,정익수,고현주,김태영 동아시아식생활학회 2003 동아시아식생활학회지 Vol.13 No.5

Various volume of water for the optimal brewing condition of the Korean distilled liquor produced by liquefaction of rice and corn starch was investigated Pilot brewings were carried out by the liquefaction of 5㎏ of rice and 10㎏ of corn starch with 150%, 200% and 250% of water regarding the amount of rice and corn starch. The pH, alcohol production and total acidity were normal during the fermentation process. The yield was proportional to the amount of water added and the highest yield was obtained by 250% of water addition without loss of quality. All the test results were not significantly different by the one-way ANOVA and Duncan's multiple range test at p<0.05 and the flavor profiles were also not different according to the amount of water added. As a result, 250% of water addition was the most economical and optimal brewing condition in this study.

단결정β"-알루미나內의 Na→Ag 이온교환 반응에 관한 연구

박상면 한국항공대학교 1993 論文集 Vol.31 No.-

??-알루미나에서 Na-Ag 이온들의 상호확산현상을 연구하기 위한 Na→Ag 이온교환 반응이 고안되었다. 단결정 Na ?-알루미나에 ²²Na 방사선 동위원소를 주입한후 300℃의 AgNO₃용융염에서 1,2,4,8,10,16,32분동안 이온교환반응을 행하였다. 이온교환률은 무게화 ²²Na 방사선 활동도의 변화로부터 각각 구하였으며, 이 두방법은 서로 좋은 일치성을 보였다. 반응은 비교적 빨리 일어나서 32분내에 약 90% 이상의 이온 교환율을 얻을 수 있었다. ??방사선 활동도의 변화로부터 산출한 외견상의 Na-Ag 상호확산계수(Dapp)는 300℃에서 ??이며 이 값은 Nernst-Einstein 관계식으로부터 구한 Na보다 Ag의 자기확산계수에 더 가깝게 나타났다. 따라서 Na→Ag 이온교환 반응속도는 보다 느리게 움직이는 Ag의 확산에 의해 지배되는 것을 알 수 있다. 한편 Nrenst-Planck식으로부터 구한 상호확산계수는 Dapp가 실제의 상호확산계수에 근접한 값인 것을 나타낸다. Table 1. Rate of Exchange of Na by Ag in Single Crystal of ??-Alumina and its Interdiffusion Coefficient Time 1 2 4 8 10 16 32 (min) %Exch. 25.7 29.3 46.4 64.0 67.6 74.1 91.9 (by wt.) %Exch. 18.5 35.5 52.0 65.4 69.2 80.4 94.9 (by 22Na) ?? 0.906 2.53 3.09 2.78 2.59 2.56 2.70 ?? The ion exchange of Na by Ag was designed to study the interdiffusion behavior of Na-Ag in ??-alumina. Single crystals of Na ?-alumina labeled with ²²Na were exchanged in molten AgNO₃ at 300℃ for 1,2,4,8,10,16,32 minutes. The apparent Na-Ag interdiffusion coefficient determined from the change of ²²Na activity in the sample after exchang was found to be 2.71×?? at 300℃. This value compares more favorably with the self diffusion coefficient of Ag than Na calculated from the Nernst-Einstein equation. Inerdiffusion coefficient calculated from the Nernst-Einstein equation. Interdiffusion coefficient calculated from the Nernst-Planck equation indicated that the apparent interdiffusion is in the reasonable range.

微分層反應器에서 高分子樹脂에 依한 클로로페놀類의 吸着擧動에 關한 硏究 : Ⅰ. 吸着平衡 Ⅰ. Adsorption Equilibrium

黃尙勉,鄭在灌 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.1

In this study, p-chlorophenol and 2,4-dichlorophenol adsorption equilibrium behavior from aqueous solutions was investigated using nonionic polymeric resins, XAD-4, XAD--7, and XAD-1180, which have macroreticular structure and were manufactured by Rohm and Haas Co.. The batch equilibrium tests for p-chlorophenol and 2,4-dichlorophenol using the polymeric resins were performed at 22 ℃ and pH 6.5. The results obtained from the tests were as follows : 1. As the best fit of experimental data for p-chlorophenol, Redlich-Petersen adsorption isotherm for XAD-4 resin, Freundlich isotherm and Redlich-Petersen isotherm for XAD-7, and Freundlich isotherm for XAD-1180 were determined with the deviation of 2.86%, 2.06%, and 3.10% for the respective experimental values. 2. For 2,4-dichlorophenol, as the best fit of experimental values Freundlich adsorption isotherm for XAD-4 resin, Redlich-Petersen isotherm for XAD-7, and Freundlich isotherm for XAD-1180 were determined with the deviation of 3.31%, 3.03%, and 4.14% for the given experimental data, respectively.

유전자(DNA)분석에 의한 삼풍백화점 붕괴희생자의 가족관계 확인 사례

최상규,한면수,선문숙,이양한,박기원 內務部 國立科學搜査硏究所 1996 國立 科學 搜査 硏究所 年報 Vol.28 No.-

한국에서의 간호중재분류체계(NIC)구조 타당성 검증

박성애,박정호,정면숙,박성희,염영희 서울대학교 간호대학 간호과학연구소 1999 간호학 논문집 Vol.13 No.2

The purpose of this study was to validate the NIC taxonomy in Korea. A sample of 10 nurse experts who were head nurses at a university affiliated hospital and had some knowledge and experience with research method and NIC rated, the NIC taxonomy twice using five criteria: clarity; homogeneity; inclusiveness; mutual exclusiveness; theory neutral. The NIC Taxonomy Evaluation questionnaire developed by the Iowa Intervention project team was used for data collection. The instrument was translation and back-translation. The results were as follows: 1. About fifty-eight percent of the respondents rated the domains as either quite characteristic or very characteristic on all criteria and about seventy -one percent of the respondents rated the classes as either quite characteristic or very characteristic on all criteria. 2. The criterion of theory neutral received the highest ratings and the criteria of clarity and inclusiveness received the lowest ratings on domains. 3. The criterion of theory neutral received the highest ratings and mutual exclusiveness received the lowest ratings on classes. 4. The Physiological: Complex domain received the highest ratings and the Family domain received the lowest ratings. These findings suggest that Nursing Interventions Classification System sensitive to Korean culture need to be developed.

일부 서울지역 실내.외 공기중 휘발성 유기화합물질(VOCs)의 농도조사

정제면,손종렬,유인성,변상훈 高麗大學校 倂設 保健大學 保健科學硏究所 2001 保健科學論集 Vol.27 No.1

Our communities have been exposed to polluted air. Polluted air could cause the serious injury such as respirational impediment, disease and so on, and the air pollution could be most serious problem in our life. Unfortunately, we didn't have consider these problems seriously, and we had make no solutions for these problems. Although the concentration of indoor and outdoor didn't show the high values, VOCs existed in indoor and outdoor environment. The indoor concentration was more higher concentration than the outdoor concentration, that indicated the indoor environment was more polluted. This study showed that the investigation of a continuous environment polluted were needed.