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냉동 수산물의 저장 온도 관리를 위한 Time-temperature Indicator와비전 기반 Indicator 분석 프로그램 개발
장명기,홍창욱,최재혁,김꽃봉우리,최정욱,남택정,안동현 한국수산과학회 2018 한국수산과학회지 Vol.51 No.1
We develop a time-temperature indicator (TTI) that can determine whether thawing of fish and other fishery products has occurred during frozen storage. A polypropylene tube with an internal diameter of 3 mm was prepared and cut to a length of 14 to 20 mm. One end of the tube was thermally sealed and 0.1% acetic acid was injected into the other end; the tube was then frozen at 20℃. Then the open side of the frozen tube was blocked by sinking the tube into a 10% gelatin solution. The tube was attached to a polyvinyl packaging bag along blue litmus paper and the bag was put into a freezer at -20℃. After freezing, the bag was removed to an ambient temperature of 20℃, and the time dependence of the color change of the litmus paper was observed. The color changed from blue to red, with the length of the red region increasing with time. Our TTI can be used as a part of a visible detection system and the detection program can conduct the elapsed time analysis on the length of the red region of the litmus paper indicating the degree of thawing. Thus, the TTI is a useful tool in the temperature management of frozen fish and fishery products.
Sensor Gas Chromatography 시스템을 이용한 고등어(Scomber japonicas)의 신속한 신선도 평가 방법
최정욱,이민경,홍창욱,최재혁,장명기,김꽃봉우리,김고은,박가령,안동현,남택정 한국수산과학회 2017 한국수산과학회지 Vol.50 No.6
We developed a method to rapidly evaluate the freshness of fish using a sensor gas chromatography (SGC) system. Mackerel Scomber japonicus was stored at 4°C for 12 days to create an environment similar to the natural decompositionprocess. Trimethylamine (TMA) content in mackerel muscle was measured at 3-day intervals using a spectrophotometer. The gas-phase concentration of TMA in whole mackerel was also determined using an SGC system. The muscle TMA content increased over time during storage, as did the gas-phase concentration of TMA. Therefore,this study demonstrated that an SGC system can be used to rapidly measure the gas-phase concentration of TMA infish during processing.
최정욱,장명기,홍창욱,이주운,최재혁,김꽃봉우리,Xiaotong Xu,안동현,이민경,남택정 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.1
This study evaluated the use of an optical inspection system (OIS) to determine the freshness of mackerel (Scomber japonicus). The correlations between the light reflection intensity (LRI) of mackerel eyes (determined using an OIS) and the volatile basic nitrogen content (VBN) and K-value were analyzed. After unloading at the harbor, the mackerel were stored at 4 』C for 9 days and the VBN, K-value, and LRI were determined at 3-day intervals. During storage, the LRI, VBN, and K-value all increased. Furthermore, the LRI was correlated with the K-value and VBN. Therefore, although the LRI cannot be applied as an absolute standard for evaluating freshness, the LRI using an OIS is a suitable nondestructive method for evaluating freshness for quality and risk management in the processing industry when handling large numbers of fish.
문종훈(Jong-Hoon Moon),홍창욱(Chang-Oug Hong),권중록(Joong-Lok Kwon) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
이젝터는 수소재순환가스를 고압의 주유동압을 사용하여 매체를 이송시키는 장치이다. 일반적으로 이젝터는 주유동 노즐, 혼합부, 재순환 챔버, 디퓨저로 구성된다. 이젝터는 단순한 구조와 상대운동부품이 없기 때문에 간단하게 대량의 유체를 이송시킬 수 있다. 연료전지차에서는 스택의 수소이용율을 높이기 위해 수소재순환시스템을 적용하는데, 이와 같은 시스템 중 블로어와 이젝터를 사용하는 하이브리드 수소재순환시스템에 적용한 이젝터를 본 연구에서 개발하였다. 연료전지차에 사용되는 이젝터는 자동차부품의 특성상 부피와 무게의 제약이 따르며 자동차 운전조건에 따라 최적의 부피로 최대한 재순환 가스를 흡입하여 스택으로 공급하여야 한다. 본 연구에서 연료전지 운전조건에 만족할 수 있는 이젝터를 개발하기 위하여 최적의 싱글이젝터를 설계하여 CFD 해석 및 실매체 시험을 통해 성능을 검증하였으며 이젝터의 흡입성능 영역을 확대하기 위하여 두 개의 이젝터를 결합한 듀얼이젝터를 개발하였다.