본 연구는 설탕의 일부를 트레할로스로 치환하여 제조한 쌀식빵의 품질을 검토한 것이다. 쌀식빵의 맛과 품질을 새롭게 하고 노화 억제 효과가 있는 트레할로스를 설탕 사용량의 25%(Ts25), 50%(Ts50), 75%(Ts75)를 트레할로스로 각각 치환하여 제품을 제조한 다음 상온에서 0, 2, 4일간 저장하면서 경시변화를 확인하였다. 쌀식빵의 비체적은 트레할로스를 첨가한 쌀식빵의 경우 대조군의 97%로 약간 줄어든 결과를 보였으나 경시적인 변화는 감소률이 적은 것으로 나타났다. 수분함량 또한 0일차에는 대조군과 트레할로스 첨가 시료 간 차이가 없었지만 트레할로스 첨가 시료의 수분함량은 경시변화가 작아 보습 효과가 나타났다. 쌀식빵의 경도는 트레할로스를 첨가한 시료에서 대조군보다 유의적으로 낮아 트레할로스의 첨가는 쌀식빵 경도를 낮추어 주는 효과가 있음을 알 수 있었다. 관능검사 결과 쌀식빵의 맛은 대조군에 비해 Ts50의 시료가 가장 좋은 것으로 나타났으며 경시변화를 살펴보면 대조군의 경우 2일차, 4일차에서 크게 감소하였지만 트레할로스 첨가 시료는 맛의 감소가 적은 것으로 나타났다. 풍미와 질감, 전반적인 기호도에서도 트레할로스 첨가 시료가 대조군보다 전반적으로 좋다고 나타나 대조군에 비해 시간이 경과할수록 품질이 유지 또는 증가하는 것을 볼 수 있었다. 트레할로스 첨가는 품질 지속시간 증가에 따른 상품성을 기대할 수 있어 제과·제빵 관련 상품개발에 활용할 수 있을 것이다.

The purpose of this study was to investigate American's perception and preference for Korean kimchi. A questionnaire was used to examine the perceptions of 126 males (40.4%) and 186 females (59.6%) residing in Illinois and California. Approximately 68% of the respondents had eaten Korean food. The perception of kimchi was the highest with a mean of 3.62. The respondents felt that the "Kimchi is a good side dish with cooked rice", "Kimchi (with garlic) prevents SARS", which was significantly different (M=3.06, p< .001), and "Kimchi prevents adult diseases" (M=3.24, p< .01). When evaluating the different kinds of kimchi, onion juice kimchi had the most preferred taste and also the highest overall acceptability (M=5.50, p< .05) of the second days. In the sensory evaluation by kimchi use, the best taste (p< .001) was in the order of kimchi pizza (M=6.58), kimchi dumplings (M=6.40), and kimchi chicken a'laking (M=6.33). The order for overall acceptability (p< .001) was kimchi dumplings (M=6.30), kimchi pizza (M=6.25), kimchi bacon roll, kimchi fried rice, and kimchi chicken a'laking (M=6.17).

1-Deoxynojirimycin(1-DNJ) was hardly detected by general UV detector. Therefore, in this study, we analyzed 1-DNJ, a effective functional material in which was contained the leaves of Cudrania tricuspidata and its tea by gas-chromatography. Synthesized a TMS derivative by attaching trimethylsilyl group to 1-DNJ, analyzed this by GC, and could detect a good peak. The leaves of Cudrania tricuspidata contains 1154.83±56.67 ug/g.d.w of 1-DNJ and tea of Cudrania tricuspidata leaves does 8.01±0.61 ug/g.d.w. This means the contents of 1-DNJ was nearly identical to each other. The larger size of the leaves had the more contents of 1-DNJ and the middle region of collection was the highest than any other collective regions of leaves.

This paper presents applicability of photocatalytic decomposition of methyl mercaptan using TiO2. A quartz reactor was used in order to elucidate reaction pathway in photocatalytic decomposition of methyl mercaptan. Experimental results showed that more than 99.9% of methyl mercaptan was decomposed within 30 minutes. It was found that the photocatalytic decomposition of methyl mercaptan followed pseudo first order and its reaction coefficient was 0.05min-1 During 30 minutes in the photocatalytic reaction, the concentration of methyl mercaptan, dimethyl disulfide, SO2, H2SO4, COS, H2S were determined. These results showed that 64% of methyl mercaptan were compensated for the increase in sulfur after 30 minutes through the mineralization. The proposed main photocatalytic decomposition pathway of methyl mercaptan was methyl mercaptan→dimethyl disulfide→SO2→H2SO4.

The purpose of this study was to investigate Chinese university students' in Beijing perception for Korean Kimchi. The results were as follows: A questionnaire was examined on male 145 (45.7%) and female 172 (54.3%) college students of residing in Beijing. Nationality of Kimchi answered Korea 83.3% of all the participants, and have eaten Kimchi was 59.0%. Male purchased commercial Kimchi 39.7%, and female restaurant 44.9% (p< .05). The first answered 'it was taste' 52.1% when commercial Kimchi purchased, and packing size of commercial Kimchi was 50g 50.0%. Among the intake experience have eaten Kimchi was the highest Baechu Kimchi 79.1%, Mu Kimchi 68.4% and Oi Kimchi 63.6%, also preference of Kimchi was Baechu Kimchi 44.3%, Mu Kimchi 29.3% and Oi Kimchi 19.2% in order. After have eaten Kimchi answered good 64.6% (p< .05), Kimchi liked reason were the highest 'refreshing taste' 42.4%, unliked were 'oder (of garlic, ginger and anchovy juice, etc)' and 'too spicy' 33.3%, respectively. Improvement on consumption extention of Kimchi answered 'not too salty' 30.2%, 'not too hot' 28.5% and 'not too strong seasoning' 22.7%. Perception for Kimchi answered the highest mean (3.95) 'Kimchi is a good side dish with cooked rice'.

In general, water treatment sludge (WTS) had high concentration of heavy metal, thus it made the reuse or recycling of WTS difficult. The optimal solidification conditions for maximum suppression of heavy metal elution from WTS were decided in this study. Under the optimal solidification conditions (i.e., temperature, 320℃; ratio of WTS and MgO, 9:1; solidification time, 1hr), all of heavy metal including aluminum were not detected. Therefore there are no problems for reuse or recycling of WTS which was solidified under the optimal solidification conditions found in the study.

Ethanol washing with distillation as a cleanup process of polycyclic aromatic hydrocarbon(PAH)-contaminated soil was investigated in this study. A multistage ethanol washing with distillation process was applied to three different types of soil, i.e., sandy soil, alluvial soil, and clay with the initial concentration of benzo(a)pyrene 10 mg/kg, benz(a)anthracene 250 mg/kg, and pyrene 100 mg/kg soil. Ethanol was selected as washing solvent because of its high PAH removal efficiency, low cost, and non-toxicity comparing to the other solvent such as isopropyl alcohol and sodium dodecyl sulfate. The satisfactory results (i.e. lower than benzo(a)pyrene 1 mg/kg, pyrene 10 mg/kg, benz(a)anthracene 25 mg/kg, which are the Canada or the Netherlands soil standard) for three types of soils were obtained by at most five-six times washing. It was suggested that organic content in soil decreased the removal efficiency by ethanol washing.

위상최적설계는 개념설계에 적합하며, 제품의 설계에서 사용되어지고 있다. 전통적인 위상최적화는 균질화법과 최적조건법을 사용해 왔다. 균질화법은 구멍으로 구성된 구조물과 강성행렬사이의 관계를 연결해주는데 사용되며, 최적조건법은 부피분율을 유지하며 설계변수의 개선에 사용되어진다. 전통적인 위상최적설계는 수렴성이 좋은 장점은 있지만 수렴시간이 많이 걸린다는 단점이 있었다. 이 문제를 해결하는 하나의 방법으로 평균 응력량을 기준으로 요소를 제거하는 요소제거법을 제시하였다. 예제에서 수렴속도가 향상됨을 알 수 있었다.

유전자 알고리즘은 적자 생존과 자연친화의 유전이론을 기초로 하여 이루어진 탐색기법이다. 유전자 알고리즘은 미분 정보 등과 같은 부가적인 정보없이 수렴함으로 전역적 최적값을 탐색하는 강인한 탐색기법으로 알려져 있다. 유전자 알고리즘은 연속형의 설계변수를 가지는 문제에서 세대가 계속 진행되어도 목적함수의 개선이 없이 조기에 수렴하는 경우가 있다. 또한 전역적 최적값 근처에서 수렴하지 못하고 목적함수값이 진동하여 수렴속도가 떨어지는 단점이 있다. 본 연구에서는 위와 같은 유전자 알고리즘의 단점을 보완하고자 재시동 조건과 엘리트 보존방법을 제안하였다. 수정된 유전자 알고리즘의 유용성을 검증하기 위해 3부재 트러스와 평면응력 외팔보에 적용하여 수렴 속도의 향상을 확인하였다.