Activated carbon fiber (ACF) filters are widely used to remove volatile organic compounds (VOCs) in air cleaning devices. The performance of ACF filters could be enhanced combining adsorption process with photodegradation process. In this study, to investigate this enhancement effect, a duct-type reactor was made and TiO2 was i㎜obilized on a co㎜ercialized ACF filter. Benzene, toluene, and m-xylene (BTX) were chosen as target compounds. Removal experiments for BTX were done under different air velocity and upstream concentration conditions. The range of inlet concentration was 200～1,400 ppb and the air velocities were 0.4, 0.7 and 1.0 m/s. Adsorption by an ACF filter alone showed high removal efficiency of BTX, depending on the BTX species, the upstream concentration, and the air velocity. The combination of TiO2 and ACF filter significantly increased removal of benzene which was less removed than other pollutants by an ACF filter alone. It was found that the combination effect was small in removal test of toluene and m-xylene. Removal efficiency in the tested experimental conditions was decreased in order of toluene > m-xylene > benzene.

본 연구는 시간압력이 주어진 상황에서 개인의 고유한 인지특성인 인지양식과 과제의 난이도에 따른 학습맥락이 시각변별과제의 기술습득과 전이에 어떠한 영향을 주는지 알아보고자 하였다. 자극은 다각형 비교과제를 이용하였으며, 실험은 스크린 세션, 훈련 세션 그리고 전이 세션으로 구성되었다. 스크린 세션에서는 참가자를 인지양식(분석적-전체적)에 따라 구분하였으며, 훈련 세션에서는 학습맥락의 구분을 위해 과제의 난이도를 어려운 조건과 쉬운 조건으로 나누었다. 전이 세션에서는 모든 피험자가 새로운 난이도의 다각형을 비교하였다. 훈련 세션과 전이 세션에서는 시간압력의 효과를 보기 위해, 1.5초가 지나면 자극이 사라지게 하였다. 전 세션에 걸쳐 정확도와 반응시간을 측정하였다 실험결과, 분석적 처리자는 훈련 세션 동안 전체적 처리자와 같은 수준의 빠른 반응을 보이나, 훈련이 지속될수록 반응시간의 기울기가 증가하였다. 이러한 결과는 분석적 처리자가 자극의 세부특징들을 일 대 일로 비교하는 원래의 처리스타일로 회귀했음을 의미한다. 반면, 분석적 처리를 유도하는 어려운 학습맥락에서 훈련한 전체적 처리자의 경우, 전이 세션의 초기블록에서 반응시간의 증가를 보였다. 이것은 전체적 처리자가 어려운 학습맥락에 의해 분석적 전략을 개발했다는 것을 의미한다. 이러한 결과들을 통해 시간압력 상황에서도 개인의 인지양식의 차이가 인지전략의 개발 및 기술습득에 영향을 미치는 것을 확인할 수 있다.

Demand for organic analysis increase as industries are growing and many products are spreaded in the daily life. One of many products is oil spill dispersant. It was used for oil accident in the ocean. When oil spill dispersant spread at the ocean, the petroleum in the ocean is dispersed. The oil spill dispersant is made of non ionic surfactant and petroleum oil. The non ionic surfactant disperse petroleum from oil accident. The other part is petroleum oil which has aromatic hydrocarbon. Because the aromatic hydrocarbon is cancerogenic material, it directly injure animals in the ocean. This cause the second pollution in the human body. Many oil accidents still are controlled by oil spill dispersant. Therefore quality control of the oil spill dispersant become important and this also demand for the exact quantitative analysis of aromatic hydrocarbon. Hereupon the first we develop separate petroleum oil from surfactant. The second standardize analytical method of aromatic hydrocarbon in the separated petroleum oil.

This study was carried out to develop character notes and to define the terminology for the evaluation of soybean curd using quantitative descriptive analysis. Panelists were selected according to their performance with ranking on basic tastes, flavor and texture properties related to soybean curd. After being trained, they identified the following attributes and defined the terminology: appearance(smoothness of the surface, amount of cracks, yellowness, grayness), flavor(sweet, salt and bitter tastes, cooked bean, raw bean, wet wheat flour, roasted bean, astringency), and textural properties(hardness, elasticity, inner moistness, coarseness, adhesiveness, and residuals). Reference samples for flavor attributes were also determined. Four types of commercial soybean curd were evaluated with the technique developed. Among soybean curd samples, there were significant differences in the intensity of all sensory attributes, confirming appropriateness of the evaluation methodology.

Vibrio mimicus is a closely related species with V. cholerae, and has been reported to be associated with gastrointestinal infections. Although extraintestinal infections of these vibrios have also been reported in Japan and Southeast Asia. But little research papers on V. mimicus was reported in Korea. Therefore, we tried to isolate V. mimicus from the environmental sea water from April to July in Pusan, Korea. Among the isolated strains, we selected the strongest hemolytic strain and then named V. mimicus SM-9. In this paper, we checked the antibiotic susceptibility and psychrotrophic characteristics of the isolated strain. Hemolytic activity of the hemolysin produced by the isolated strain was also measured. V. mimicus was not detected from the sea water samples in April and May, but its detection rate was relatively high in June and July in Pusan, Korea. The bacteriological characteristics of V. mimicus SM-9 were Gram-negative rods, motile, oxidase positive, Voges-Proskauer negative and sucrose negative. In 23 kinds of antibiotics susceptibility test, V. mimicus SM-9 showed susceptibility to the most of antibiotics submitted while it was resistive against lincomycin, oxacillin, rifampin and vancomycin. Hemolytic activity of the hemolysin produced by V. mimicus SM-9 was highest in stationary phase of the growth curve in BHI broth at 37℃ and its activity was reached 18 HU per ml of culture supernatant. For checking the psychrotrophic property of V. mimicus SM-9, the decreasing rate of the strain in phosphate buffer solution and yellowtail flesh homogenate was examined during the storage at 4, 0, -4 and -20℃. The decreasing rates of the selected strain stored in phosphate buffer solution were greater than those in fish homogenate. Decreasing rates of V. mimicus SM-9 stored in phosphate buffer solution were not significantly different by the storage temperatures. The viable cell counts of the strain were decreased as 5 log cycles after 120 hours at all the tested temperatures. While decreasing numbers of the strain in fish homogenates were 2-4 log cycles after 120 hours. The decreasing pattern of the strain numbers were very slow after 200 hours at all the stored temperatures.

Y0.8Ta0.2O1.7-MO(M=Ba, Sr, Ca 및 Mg) 계에서의 형석구조의 생성과 이와 관련된 구조에 관하여 연구하였다. BaO또는 SrO를 4mol% 첨가한 조성에서는 결함형석구조 이외에 입방정 perovskite형 규칙구조인 Ba2YTaO6 및 Sr2YTaO6와 입방정 Y2O3가 관찰되었다. CaO를 첨가한 경우에는 8mol%이상을 첨가한 조성에서부터 단사정 Ca2YTaO6와 Y2O3의 2차상이 나타났다. MgO의 경우에는 12mol% MgO를 첨가한 조성까지는 형석구조의 단일상을 나타내어 MgO가 형석구조에 고용되는 것을 알수 있었으며, 16 mol%조성부터는 2차상으로 MgO가 관찰되었다. 그러므로 위의 계에서 형석구조의 생성은 A2(B'B")O6의 생성과 첨가된 양이온의 크기에 영향을 받는 것으로 생각된다.생각된다.