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손의 미생물 오염도의 경시적 변화 - 조리종사자를 중심으로
김종규,김중순,박정영 한국식품위생안전성학회 2011 한국식품위생안전성학회지 Vol.26 No.2
Inadequate food handling and poor hand hygiene play a major role in the occurrence of foodborne diseases. The objective of this study was to find out if the level of microbial contamination on the hands of food preparers varies by time during their working period. This study focused on the contamination of aerobic plate count,total and fecal coliforms, Escherichia coli, Staphylococcus aureus, and Salmonella spp. Sampling from left hand and right hand of twenty food preparers was done with glove-juice method at every two hours during their work. Microbiological testing was conducted according to the Food Code of Korea. The microbiological load on the hands was changed over time. Samples taken from their hands before work and at 8 hours showed higher levels of bacteria than those taken at 2, 4, and 6 hours during work and/or after work (p < 0.05). The contamination levels of microorganisms were consistently higher in right hand than in left hand. Poor hand hygiene practices were indicated by the positive results for total and fecal coliforms, E. coli, S. aureus, and Salmonella spp. on the hands of some food preparers. This study indicates food preparers' hands can be a vehicle of pathogen during their work. The results of this study emphasize the importance of hand hygiene education and training targeting the food preparers.
핵심자기평가의 내적구조 검토: 탐색적 구조방정식 모형(ESEM)의 적용을 통한 선언척도와 실제척도의 차이 검토
김종규,이순묵,윤창영 한국산업및조직심리학회 2015 한국심리학회지 산업 및 조직 Vol.28 No.3
본 연구에서는 핵심자기평가가 실제로 어떤 내적구조를 가지는지를 탐색적 구조방정식 모형을 적용하여 검토하였다. 검토 방법으로서 기존의 탐색적 요인분석 방식과 확인적 요인분석 방식은 척도의 문항들이 측정하고자 한 개념 이외의 다른 개념의 지표가 되거나 다른 기존 개념을 측정하는 문항과의 상관을 검토하지 못함으로서 현실에서 나타나는 척도의 정확한 내적구조를 파악하지 못하는 한계가 있었다. 이에 대한 대안으로서 탐색적 구조방정식 모형을 적용하여 내적구조를 검토하였다. 그 결과, CSE의 선언척도에서 제시된 문항들이 경험자료에서는 다르게 행동하는 것을 확인할 수 있었다. 이러한 불일치가 발생하는 이유는 첫째로 핵심자기평가 척도가 두 개 또는 여러 개의 핵심 특질을 동시에 측정하는 문항 12개를 선별하여 개발됨으로써 문항들이 다른 유사 구성개념의 지표가 될 수 있는 가능성이 크고, 둘째로 핵심자기평가의 개념이 될 수 있는 여러 특질과의 관계가 충분히 검토되지 못해서 경험연구에 따라서는 다른 척도 내 문항들과의 변별이 되지 않아 발생한 문제로 볼 수 있다. 따라서 핵심자기평가 이론의 논리적 관계구조 속에서 해당 구성개념을 명확히 하고 보다 정교한 내적구조를 갖춘 척도의 개발이 요구된다.
초미세기포를 이용한 딸기 성장 모니터링 및 수중의 대장균 제거
김종규 한국수처리학회 2019 한국수처리학회지 Vol.27 No.5
In this study, UFBs of less than 100nm size were generated by using GoodSam-UFB generator(made by S company) that generates UFBs through Cavitation technique. The generated UFB was directly applied to the strawberry cultivation process to monitor strawberry fruit productivity. In addition, the efficiency of E. coli removal in water by strong oxidizers such as OH radicals produced by UFB was evaluated. As a result, when the aqueous nutrient solution with UFBs was supplied to the strawberry medium, it had a slightly higher initial concentration compared to the nutrient solution prepared with general groundwater at a concentration of about 9mg/L and did not decrease significantly over time. In addition, it was found that the concentration of dissolved oxygen was kept high. In other words, it is easy to supply dissolved oxygen to help root growth in the early stage of strawberry growth, thereby promoting the growth of strawberries. After feeding the nutrient solution for the growth of strawberries, the nitrate concentration of the discharged nutrient solution was analyzed. As a result, dissolved oxygen contained in aqueous nutrient solution with UFBs helped the nitrate to be smoothly taken from the soil. Therefore, the concentration of nitrate in the effluent was reduced, hence strawberry growth was promoted. As a result of the E. coli removal test, aqueous solution with UFBs showed very high E. coli removal efficiency compared to the commercially available antibacterial agent. These results can be explained by the strong oxidizers included in the UFB water.