콘크리트 자기치유를 목적으로 미생물 혼입 하이드로젤 지지체 첨가에 따른 콘크리트의 특성을 검토하였다. 자기치유 콘크리트의 슬럼프 측정결과, 모든 배합조건에서 목표슬럼프를 만족하였으나, 하이드로젤 지지체의 혼입량 증가에 따라 슬럼프 감소가 있었다. 하이드로젤 지지체 혼입에 따른 공극률의 변화는 미미하였다. 자기치유 콘크리트의 압축강도 평가결과, 하이드로젤 지지체의 혼입은 강도에 영향을 미치지 않았다. 하지만 동일 배합조건하에서 시험체간의 분산값이 하이드로젤 지지체 혼입량 증가에 따라 증가하는 경향을 나타내었다. 하이드로젤 지지체의 혼입에 따른 자기치유 콘크리트의 투수시험 결과, HC-B1.5 배합의 경우 최대 45.6%의 투수계수 회복율을 나타내어 하이드로젤 지지체의 혼입이 투수계수 감소에 효과가 높은 것으로 확인되었다

The purpose of this study is to present the results as basic data for establishing proper storage conditions and distribution conditions of actual farms at point of increasing concern about hygiene and palatabiltiy of consumers to food. In this study, three farmhouses of dried persimmons prepared using different storage conditions were selected in Sangju (Korea). The dried persimmons were stored for 90 days. Changes in temperature and humidity were measured with a temperature and humidity recorder under each storage condition, and physicochemical analysis and sensory evaluation were performed. The average temperatures of farmhouse A, B and C were approximately -22--23℃, -19--18℃ and -25℃ respectively. The humidities of A, B and C were 62-63%, 59-60%, and 66-67%, respectively, and the moisture contents of all farmhouses increased during the storage period, with farmhouse B showing the most rapid increase. Free sugars increased, except for those from farmhouse C. Persimmons from farmhouse B showed the greatest changes in chewiness and hardness. The values of a* and b* were significantly decreased in persimmons from farmhouse B, and the color difference value of farmhouse B was dramatically increased. Sensory evaluation showed that the color preference tended to decrease compared with the initial value. Only farmhouse B showed decreased overall acceptability. Moreover, farmhouse B had the highest storage temperature and lowest humidity. Therefore, our results showed that storage at a low temperature and high humidity was important for manufacturing high-quality dried persimmons.

In this study the physicochemical properties and antioxidant capacities of ginger (Zingiber officinale Rosc) Jungkwa with different kinds of sweeteners were determined. Jungkwa made with different sugars (sugar, xylitol, honey or oligosaccharides) were compared in aspect of physiochemical properties, antioxidant activities, total phenolic contents and sensory evaluation. Moisture contents Jungkwa treated different kinds of oligosaccarides showed highest value, in the order of honey, xylitol and sugar. L* value of Jungkwa treated with xylitol was the highest, a* value of Jungkwa treated with honey, sugar Jungkwa were higher then others. Free sugar contents of Jungkwa treated with sugar showed the highest value in sucrose, glucose and galactose. Jungkwa with xylitol showed lowest value in all free sugar contents. Hardness and chewiness of Jungkwa treated with xylitol showed the highest value. The antioxidant activity measured by DPPH and ABTS radical scavenging activity and total penolic content were the highest in Jungkwa treated with honey, followed by Jungkwa treated with xylitol, oligosaccharides and sugar. Appearance and color of oligosaccarides and honey treated Jungkwa were preferred. In ginger taste, sweetness, chewiness were highest in sugar treated Jungkwa (not significant difference in treatments). As a result, honey treated Jungkwa has higher antioxidant activity and quality than other sugar treatments.

국내외에서 유통하고 있는 순수 페퍼민트 정유(29점)와 국내에서 재배하여 추출한 정유(1점)를 성분함량분석과 항산화 활력, 항균활성을 검정하였다. ISO에서 제시한 9가지 기준을 충족한 상품은 없었으며, menthol, limonene, menthyl acetate 등의 주요성분은 모두 미국원산 정유에서 대체로 많은 함량을 나타냈다. 민트의 주성분인 menthol함량은 국내만이 0.55%로 가장 낮고, 미국산이 46.72%로 가장 높았다. 1.8-cineole 성분은 국내에서 재배하여 추출한 정유가 13.6%로 가장 높은 함량을 나타냈으며, 국내에서 수집된 튀니지원산의 정유가 9.0%로 높았다. 항산화 활력은 최소5.7%에서 최대97.8%의 전자공여능을 나타내 시료간 현저한 차이를 보였다. 국내에서 수집된 정유 중 미국원산 정유가 5.7%로 가장 낮았고, 호주산 정유가 97.8%의 높은 항산화 활력을 나타내 상품간의 편차가 매우 컸다. 그러나 대부분의 정유가 40-60%의 항산화 활력을 보였다. 페퍼민트 정유의 주요 식품부패미생물(S. aureus, E. coil, S. typhimurium)에 대한 항균활성은 억제대 실험과 최소저해농도 실험 결과, 정도의 차이는 있었으나 모든 미생물에 항균력을 보였고 특히, S. aureus와 E. coli에 강한 항균활성을 보였다.

This study presents numerical analysis of elastic waves for detecting damage in epoxy adhesive zone. For the finite element analysis, a finite element program ANSYS LS-Dyna is used. The result signals of finite element analysis were analyzed by using pitch-catch method. It is shown that the received time signals successfully show the existence of defects