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어린이급식소용 밀키트 필요성 및 구매의도에 대한 인식 조사 - 창원 일부 지역의 어린이 급식담당자 대상 -
김서진,박재희,문혜경 대한영양사협회 2023 대한영양사협회 학술지 Vol.29 No.3
In this study, a survey was conducted on the development of meal kits for children's foodservice to increase the convenience of the cooking process. It was performed among the foodservice managers in the 141 children’s foodservice facilities registered in the Center for Children’s Foodservice Management about meal-kits in Changwon areas. The survey results were analyzed according to the children’s foodservice scale type. The biggest problem in a foodservice system was “difficult to purchase food ingredients directly every week” (38.4%) in small-scale children’s foodservices, and “difficult to use the served menu without modification” (38.2%) in institutional children’s foodservices (P<0.001). The most important factor when choosing the meal kit was “quality” (41.1%). Respondents on having an experience with using the meal kit were low at 34.8%, and the reasons for not using the meal kits were “expensive” (67.3%) and “not fresh food ingredients” (18.4%). The main reasons for not using children’s foodservice meal kits were “expensiveness” (64.4%) and “necessity of adding disinfection process” (16.1%). Most of the reasons for not wanting to use children’s foodservice meal kits were that they did not trust the safety of the meal kits. The use of meal kits in children’s foodservices may reduce the preparation process and increase the efficiency of foodservice although the safety and quality of meal kits should be guaranteed. The appropriate hygiene management standards need to be set, and HACCP should be applied to develop meal kits for children’s foodservices.
국립태안해양유물전시관 수장고 실내공기질 시계열 변화 연구
김서진,김택준 국립해양문화재연구소 2019 해양문화재 Vol.12 No.-
Organic acids such as volatile organic compounds and formaldehyde generated indoors lead to material degradation of cultural artifacts and adversely affect public health. Because new buildings emit more harmful substances than old ones, having sufficient time to mitigate such pollutants before cultural artifacts are stored in new museum storage areas is important. Although the importance of the storage room environment is widely recognized, the characteristics of pollutants in new museum storage rooms and the changes of those pollutants over time have not been reported. Accordingly, the National Research Institute of Maritime Cultural Heritage conducted a survey to identify the characteristics of air quality in storage areas of the Taean Maritime Museum from April 2018 to March 2019. In this study, the researchers monitored the temperature, humidity, and the concentrations of volatile organic compounds, formaldehyde, nitrogen dioxide, and sulfur dioxide. Indoor air samples were collected through passive samplers and were analyzed for each analyte. Volatile organic compounds were analyzed by gas chromatography with flame ionization detection, formaldehyde was analyzed by high-performance liquid chromatography, and nitrogen dioxide and sulfur dioxide were analyzed by ion chromatography. The results showed that the indoor temperature of the storage areas was less affected by the outdoor temperature, whereas the indoor humidity was correlated with the outdoor humidity because of the ventilation of air. In addition, the time required for volatile organic compounds in storage areas to meet the action limits suggested by the Canadian Conservation Institute was 9 months. Epoxy flooring was identified as the main emission source of the volatile organic compounds in the third storage room, and an adhesive associated with beech flooring was identified as the main emission source of formaldehyde in the first and second storage rooms. In addition, the indoor concentration of the volatile organic compounds, formaldehyde, and nitrogen dioxide increased rapidly immediately after the relic boxes were stored in the rooms; harmful substances were confirmed to be released from the relic boxes and the packaging materials even though the indoor pollutant levels were below the guideline concentrations.
Electrochemical Deposition of Polyaniline on Nanopillar Array Films for High-performance pH Sensors
김서진,장성태,이경균,최봉길 한국고분자학회 2022 폴리머 Vol.46 No.5
In this work, acrylic resins consisting of difunctional poly (butyl acrylate) (PBA) were prepared via atom transfer radical polymerization. PBA acrylic resins with two different molecular weights were synthesized and the terminalgroups of the bifunctional PBA were substituted with an acrylate group (A type), a silane group (S type), and a vinylgroup (V type). The resulting PBA acrylic resins were characterized by gel permeation chromatography and nuclear magnetic resonance spectroscopy. These resins having different terminal groups were cured using thermal curing, UV curing,and moisture curing. The mechanical properties were examined using tensile and peel tests according to the molecularweight and the type of end groups
Preformulation and in vitro physicochemical characterization of fenofibrate-loaded emulsion
김서진,이상은,Choon Lian Ng,이준경,김태현,조정원,박정숙 한국약제학회 2015 Journal of Pharmaceutical Investigation Vol.45 No.7
The objective of this study was to prepare a fenofibrate-loaded emulsion. The emulsion was formulated by mixing olive oil, surfactants (mixture of Tween 20 and Tween 80), and distilled water. To find the emulsion composition, the phase diagram was investigated based on the mixture of olive oil, surfactants, and distilled water. From the phase diagram, one-phase formulations were selected and particle sizes of those formulations were compared. Stability was confirmed for 4 weeks at 4 ˚C based on the change in particle size. The effect of dilution on the pH of the emulsion formulations was observed. The concentration of olive oil was 5 %, enough to obtain a small-sized emulsion. The surfactants were used as a mixture of Tween 20 and Tween 80 in a 1:2 ratio to show high solubility of fenofibrate. Three formulations, termed E1, E2, and E3, showed relatively small-sized emulsion. The fenofibrate-loaded E2 formulations showed smaller particle sizes than other formulations. The three formulations were physically stable for 4 weeks with no significant change in particle size. Dilution with distilled water did not alter the pH of the three emulsion formulations, but changed the conductivity. In conclusion, fenofibrate was solubilized by the emulsion formulation, the stability of the emulsion formulation was maintained at 4 ˚C, and the pH of formulation was not altered, but the conductivity of formulation was changed by dilution with distilled water.
EFL Middle School Learners’ Lexical Profile and Academic Motivation During a Reading Course
김서진,전유아 언어과학회 2018 언어과학연구 Vol.0 No.85
The purpose of the study is to examine 84 middle school learners' lexical profiles, academic motivation, and post-instructional reflections of a reading course. After the learners were involved in reading theme- based books based on Lexile levels and writing for post-reading controlled writing tasks, the learners were asked to respond to questionnaires on academic motivation and a reflection of the course. The results were triangulated by semi-structured interviews with 14 learners. An analysis of learner writing products with RANGE GSL/AWL indicated that their percentage of words at the 2nd 1,000 and ‘Not in the list' level had increased at a statistically significant level. Academic motivation analyzed with paired t-tests indicated a significant difference only for ‘amotivation' by the end of the semester. Learners' reflection of the course provided further understanding of the reading course for improved reading ability and motivation.