Intense pulsed light (IPL), also known as high-intensity pulse light (HIPL), is an emerging non-thermal technology that uses light pulses of short duration, ranging from ultraviolet to infrared wavelengths, for microbial inactivation. This study aimed to investigate the sterilization of Saccharomyces cerevisiae in apple juice using IPL and mild heat. As the light intensity and treatment temperature increased, S. cerevisiae showed higher inactivation levels. When treated at 600 V and 50 °C for 10 min, clear and cloudy juices showed reductions of 3.95 log and 3.58 log, respectively. In terms of quality changes in apple juice due to pulsed light treatment, Brix and pH showed no change or a slight increase as light intensity, treatment temperature, and treatment time increased. Titratable acidity showed almost no change or a slight decrease. Color values showed a tendency for L and b values to decrease and a value to increase as light intensity, treatment temperature, and treatment time increased. Pulsed-light technology appears to be effective in sterilizing both clear and cloudy juices when combined with appropriate temperatures.

Currently, there are two main issues regarding the development of core technologies in the automotive industry: the development of environmentally friendly vehicles and securing a high level of safety in the event of an accident. As part of the efforts to address these issues, research into alternative materials and new car body manufacturing and assembly technologies is necessary, and this has been carried out mainly by the automotive industries. Large press molds for producing car body parts are made of cast iron. With the increase of automobile production and various changes of design, the press forming process of car body parts has become more difficult. In the case of large press molds, high hardness and abrasive resistance are needed. To overcome these problems, we attempted to develop a combined heat treatment process consisting of local laser heat treatment followed by plasma nitriding, and evaluated the characteristics of the proposed heat treatment method. From the results of the experiments, it has been shown that the maximum surface hardness is 864 Hv by the laser heat treatment, 953 Hv by the plasma nitriding, and 1,094 Hv by the combined heat treatment. It is anticipated that the suggested combined heat treatment can be used to evaluate the durability of press mold.

본 연구는 가열 및 감마선조사 또는 가열-감마선 병용처리가 김치의 저장성 및 품질에 미치는 영향을 평가하였다. 김치의 가열처리를 위한 온도는 에서 30분이 최적 조건으로 확인되었다. 한편 에서 30분간 가열처리된 김치에 감마선을 병용처리 할 경우 미생물감소 효과가 증가되어 20kGy의 감마선-가열 병용처리군은 에서 14일간 가속저장 후에도 미생물이 검출한계 이하로 나타났으며, 관능적 품질 또한 다른 처리군에 비해 높은 평점을 나타내어 김치의 장기