The purpose of this study was to investigate the storage stability of mayonnaise containing a different emulsifier and various levels of soybean paste powder. The mayonnaise with egg yolk as an emulsifier is E group according to the amount of soybean paste powder addition of 0%(E1), 3%(E2), 6%(E3) and mayonnaise with soy milk as an emulsifier is S group with soybean paste powder addition of 0%(S1), 3%(S2), 6%(S3). Storage stability of mayonnaise was determined during storage at 30 ± 5℃ for 8 weeks. The peroxide value, TBA value, acid value of mayonnaise with addition of 6% soybean paste powder was significantly lower than that of 0% and 3% addition. The turbidity decreased according to storage period. The viscosity of mayonnaise was increased with increasing amount of soybean paste powder. Base on these results, addition of soybean paste powder in the mayonnaise improved oxidation stability during storage period.

The Heat Transport system loop stability of CANDU-6 reactor as Wolsong-1 with the CANFLEX fuel bundle has been studied. The SOPHT modelling of the CANFLEX fuel bundle and the ROH interconnection line was made and the stability analysis response of Wolsong-1 reactor with CANFLEX fuel bundle was obtained. The mechanics of the flow instability caused by two phase flow was reviewed. Without the ROH interconnection line the Heat Transport system loop is unstable while the Heat Transport system is stable within ±1 % of nominal flow with the ROH interconnection line

고준위폐기물 처분장의 기본적인 기능은 단기간에 과도한 방사성핵종이 유출되는 것을 방지하는데 있다. 이를 위해서는, 처분시스템의 구성요소들과 관련된 많은 기술 기준이 개발되고 수립되어야 한다. 처분장 안전성평가는 합리적으로 단순화된 모델에 바탕을 두고 처분장의 미래 전개에 대한 정량적인 결과를 산출하므로 안전성평가는 기술기준의 하나로 간주되고 있다. 본문에서는 평가기간, 선량 제한치 및 평가의 불확실성 등을 중심으로 안전성평가와 관련된 주요국의 기술기준을 조사하였다. 특히, 미국의 기준을 조사하는 과정에서 안전성평가에서 도출된 peak dose가 선량 제한치를 충족하지 못하는 경우, 평가기간 및 peak dose에 대한 미국 규제당국의 접근방안은 참고할만한 가치가 있음을 알 수 있었다.

약과 반죽시 참기름 대용으로 쇼트닝을 이용할 목적으로 쇼트닝의 혼합비율을 달리하여(참기름 100%, 참기름 75%+쇼트닝 25%, 참기름 50%+쇼트닝 50%, 쇼트닝 100%) 약과를 제조하고, 약과 유지의 지방산 조성, 유지함량, 원료유지의 잔존율, 저장 중의 유지산패도(산가, 과산화물가, 카르보닐가)를 측정하여 쇼트닝 약과의 유지안정성을 비교 분석한 결과 다음과 같았다. 1. 약과 반죽의 유지 함량은 9.33%였으나, 튀김 후 시료 구별 약과의 유지함량은 25.20-29.12%로서 아주 높았다. 이들 약과의 유지 구성은 반죽에 첨가되었던 원료유지와 튀김에 사용된 튀김유(대두유)의 비율이 각각 16-10%와 84-90%로서 튀김유가 대부분을 차지하였다. 2. 모든 약과의 지방산 조성은 쇼트닝의 첨가수준에 관계 없이 시료구간에 거의 유사하여 linoleic acid 49.71-51.27%, oleic acid 26.05-26.77%, palmitic acid 10.07-11.71%, linolenic acid 5.51-5.72% stearic acid 4.51-4.68%였으며, 이것은 튀김유(대두유)의 지방산 조성과 유사하였다. 3. 쇼트닝 첨가에 따른 약과의 저장중 산가, 과산화물가, 카르보닐가의 변화는 쇼트닝 첨가가 산가의 증가를 다소 지연시켰으나 과산화물가와 카르보닐가는 시료구간에 차이를 나타내지 않았다. 약과 제조시에 반죽에 첨가되는 유지의 지방산 조성이 크게 다르더라도 약과의 유지 산패도는 큰 차이를 보이지 않았다. 이것은 튀김 과정 중 튀김유가 약과내로 다량 흡유되어 약과반죽의 원료유지보다도 큰 영향을 준 것으로 생각된다. 따라서 쇼트닝은 약과 반죽에 참기름 대용으로 사용될경우 약과의 유지 산패 면에서는 참기름 100% 약과와 차이가 없어 약과 제조시 참기름 대체효과가 있을 것으로 기대된다.

We have tested the stability of paeoniflorin, a new cosmetic ingredient, extracted from the roots of Paeoniae lactiflora. The stability of aqueous paeoniflorin solution at pH 3, 5 and 7 varied by adding buffer solution was tested at 0℃, 25℃, 40℃, and 65℃. The test was performed with or without UV light. The solution of paeoniflorin was stable at pH 3.0, however, the recovery rate of paeoniflorin was 40% at pH 7.0. The stability of paeoniflorin solution was decreased as the pH of paeoniflorin solution was increased by pH 7.0. The effect of storage temperature of paeoniflorin solution shows that the stability of paeoniflorin solution was decreased as the temperature was increased. The stability of paeoniflorin was rather good under UV light than the condition given above 40℃. The stability of paeoniflorin in W/O emulsions shows similar pattern to that of aqueous solution.

묘도-광양간 현수교는 광양항에 진입하는 항로에 위치해있으므로 큰 배들에 대하여 충돌 방지공이 필요하다. 본 논문은 선박충돌을 고려하여 위험도 분석과 비선형 수치해석을 실시하였다. 위험도 분석 결과 충돌 방지공 설치 이전에는 연간 파괴확률이 기준치인 0.0001을 초과하여 충돌 방지공이 필요한 것으로 분석되었다. 따라서, 선박의 충돌을 방지하기 위해서 인공섬과 콘리트트 블록으로 만든 방파제 벽을 사용하여 설계하였다. 계획된 충돌 방지공 설치 후 비선형 수치해석 결과 교량에 미치는 하중이 교량의 내하력 이내로 나타나 선박 충돌시에도 교량의 안정성이 확보되는 것으로 나타났다.

Caprylic/Capric triglyceride-in-water emulsions stabilized by Nikkol HCO-60 and HCO-10 were prepared using emulsion inversion point method at different HLB values. Emulsions with various droplet sizes were formed, and emulsion inversion point was detected by electrical conductivity. The change in emulsion droplet sizes and long term stability were monitored using laser scattering method and visual method. The droplet sizes and stability of emulsions were affected by HLB of surfactant. At emulsion inversion point, the water volume fraction increased as the HLB of surfactants decreased. According to our analysis, this resulted from a tendency of forming the W/O (water-in-oil) emulsion as the HLB of surfactants was decreased. The emulsion inversion point was clearly detected by the microscope and the electric conductivity meter. Nanometer-sized emulsion was obtained at the optimum HLB by using emulsion inversion point method. The main pattern of instability of emulsions in HLB 12 and 13 systems was Ostwald ripening. However, The patterns of instability of emulsions below 11 of HLB systems were Ostwald ripening and coalescence. All emulsions produced with surfactants in the range of HLB 8-13, creaming caused by density difference between water phase and oil phase.

This experiment was conducted to investigate the effect of wa-song (Orostachys japonicus A. Berger) extracts on the oxidative stability of edible oil. Wa-song was dried from hot air (HWE) and freeze (FWE), and then they were extracted by hot water. The different levels (0.1, 0.5 and 1.0 g/100 mL) of HWE and FWE were added to soybean oil and lard. The chromaticity of edible oils was generally increased with prolonged heating time and HWE was higher than FWE. The anisidine value showed significant increase during heating for 48 hrs. After heating for 48 hrs, it was lower than control, except for HWE added sample of 0.5 and 1.0 g/100 mL, FWE added sample of 1.0 g/ 100 mL. In lard, it was lower in sample added wa-song extract than control. The acid value was not significant by added amount of wa-song. Its value in HWE added sample was lower than FWE, after heating for 48 hrs. POV was lower HWE than FWE, also. After heating for 24 hrs, TBA values in soybean oil containing HWE and FWE added sample was lower than control. In lard, its value in HWE and FWE added sample was lower than control during heating for 12~48 hrs. Therefore, those results suggested that HWE has higher antioxidant activity than FWE added sample, and then oxidative stability of HWE in edible oil was more potential for lard during its heating.

The thermal stability and mechanical properties of Nephila clavata and Bassaniana decorata spider silks were measured and compared with those of aramid and polyester fibers. The thermal stability of the spider silk was lower than those of the commercial aramid and polyester fibers. However, the mechanical properties of the spider silk were far superior to that of the polyester fiber. The effect of the water content of the spider silk on its thermal stability and mechanical property was examined by conducting the silk to heat treatment at 100℃ under vacuum for various times. The results indicated that spider silk subjected to heat treatment for 1.5 hr had excellent thermal stability and mechanical property.

연성방호책 지주(post)의 설계 지반물성치를 파악하고 이를 이용한 해석방법을 수립하기 위한 방법으로서 공내재하시험(PMT)의 사용가능성을 검토하였다. 공내재하시험 결과를 이용하여 지주의 휨모멘트 및 하중-변위관계를 예측할 수 있는 해석방법의 수립가능성을 검토하였다. 모형지반과 모형지주를 이용한 정재하시험을 실시하여 하중-변위의 발생패턴과 크기를 분석하였으며 이를 공내재하시험 해석방법으로부터 구한 결과값과 비교하여 공내재하시험 해석방법의 타당성을 검토하였다. 또한 모형차(bogie)를 이용하여 모형 지주에 대한 충격시험을 실시하여 지주주변지반의 파괴형태를 파악하였으며 측정된 최대감가속도로부터 정적지지력 대비 동적지지력의 발생크기를 분석하였다. 이와 같은 시험 및 해석결과로부터 공내재하시험이 방호책 지주와 도로지반 사이의 역학적 상호연관성을 분석하기 위한 합리적인 시험방법이 될 수 있음을 확인하였다.

to malignant transformation. Oral leukoplakia is a common premalignant lesion in oral mucosa and the incidence of cancer progression into SCC has been reported to be 0~43%. The genetic alterations of oncogenes, tumor suppressor genes and DNA repair genes occur during carcinogenesis. In order to evaluate the role of epithelial cells in the early stage of carcinogenesis, we analyzed the alterations of genetic heterogeneity in epithelial cells of oral leukoplakia samples, using Laser capture microdissection(LCM). The incidence rate of microsatellite instability(MSI) and loss of heterozygosity(LOH) were analysed from the DNA of epithelial cells from 16 leukoplakia samples using adjacent fibroblasts as a normal control. In this study, LOH was found in epithelial cells of all 16 cases of leukoplakias while MSI has been observed in 3 cases. Interestingly, the fibroblasts showed LOH and MSI in some cases, which was confirmed by DNA sequencing. Taken together, this study showed that leukoplakia has multiple genetic alterations in fibroblasts as well as in epithelial cells, suggesting that interaction between epithelial cells and fibroblasts might be involved in the early step of carcinogenesis.

In manufacturing industry, cutting parameters have an influence on reducing the production cost and time and deciding the quality of a final product However, owing to governmental regulations and the change of owner's cognizance, the machining safety becomes important in those fields relatively. The paper presents an intelligent operation planning system considering machining safety for milling operations. The main issue of the system is to determine the cutting parameters in achieving a balanced consideration of productivity and worker's safety. The detailed algorithm and functions of the developed system is introduced and then discussed.