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학교 급식 식단 중 잠재적으로 위험한 식품의 활용도 분석
이혜연,부고운,배현주,Lee, Hye-Yeon,Boo, Goun,Bae, Hyun-Joo 한국식품조리과학회 2015 한국식품조리과학회지 Vol.31 No.3
The objective of this study was to develop remedies to improve sanitary quality of school meals. To analyze the usage of potentially hazardous foods, menus from 180 school foodservice establishments were collected through school websites. Statistical analyses were conducted using the SPSS package program (ver. 20.0). The results of this study are as follows: analysis of the foodservice production process revealed that the following were employed: heating process (70.5%), non-heating process (16.3%), and after-heating process (13.2%). In addition, the cooking methods used for side dishes were: stir-frying (22.1%), saengchae (21.3%), sukchae (15.2%), jorim (12.4%), deep-frying (10.2%), and grilling (9.5%). Overall, 64 menu items known to pose potential microbiological hazards were offered a total of 2,671 times. The usage frequency was high for bibimbap, pork-bulgogi, cucumber-saenchae, seasoned bean sprouts namul, seasoned spinach-namul, and korean cabbage-geotjeori. In conclusion, in order to increase the sanitary quality of school meals, menus or foods that contain microbiological hazards should prepared very carefully with respect to time and temperature management during food production. Also, school foodservice employees must possess proper food safety knowledge and techniques for applying the HACCP system to prevent foodborne illness.
이혜연,배현주,Lee, Hye-Yeon,Bae, Hyun-Joo 한국식품영양학회 2010 韓國食品營養學會誌 Vol.23 No.1
This study was conducted to analyze sensory characteristics and consumer acceptance with cookies made using various levels(0, 2, 4, 6 and 8% w/w) of Chrysanthemum indicum L. powder. Ten panels assessed sensory characteristics using a 15-point hedonic scale and forty-five consumers evaluated their acceptance based on a 7-point hedonic scale and best-worst scaling. The descriptive analyses reveled that cookie flavor did not differ significantly between the 2% added sample and the control. Cookie color and after taste increased significantly, while hardness, roasted taste, and sweetness taste decreased significantly according to increasing Chrysanthemum indicum L. powder concentration. In addition, the results of consumer acceptance showed that the overall acceptability, appearance, color, flavor, and taste decreased significantly in response to increasing Chrysanthemum indicum L. powder concentration. However, color, flavor, taste and overall acceptance with cookies did not differ significantly differ between the 2% and 4% sample. Additionally, among the cookies made with Chrysanthemum indicum L. powder, the 2% sample received the highest scores. In conclusion, the sensory optimal ratio of Chrysanthemum indicum L. powder was 2% based on the descriptive analysis of sensory characteristics and the consumer-acceptance testing.
직류송전 적용을 위한 18-스텝 Back-to-Back 전압원 컨버터에 관한 연구
이혜연(Hye-Yeon Lee),이지헌(Ji-Heon Lee),한병문(Byung-Moon Han),이옥용(Yulong Li),최남섭(Nam-sup Choi) 대한전기학회 2009 전기학회논문지 Vol.58 No.4
This paper proposes a 18-step back-to-back voltage source converter using four sets of 3-Level converter module with auxiliary circuit to increase the number of steps. The proposed back-to-back voltage source converter has an independent control capability of active power and reactive power at the interconnected ac system. The operational feasibility of proposed system was verified through computer simulations with PSCAD/EMTDC software. The feasibility of hardware implementation was verified through experimental results with a scaled hardware model. The proposed back-to-back converter can be widely applied for interconnecting the renewable energy source to the power grid.
태풍의 피해 분석을 통한 풍해 방재대책 개선에 관한 연구
이혜연 ( Lee Hye-yeon ),최창식 ( Choi Chang-sik ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
Every year, a lot of natural disasters has occurred and resulted to not only humans death but also property loss in Korea as well as other countries. Nevertheless, these unfortunate happenings gave annually occurred, but no government gave effective ways to prevent many damages referred above. Therefore, this thesis has an aim suggesting wind damage prevention Countermeasure and understanding the problems of wind-resistant design criteria by studying damages resulted from typhoon 'Maemi’.
대학입학전형에 따른 고교 학생부성적, 대학수학능력시험 성적, 대학학업성취도 간의 관계
이혜연(Hye Yeon Lee),조명희(Myoung Hee Jo),이현우(Hyeon Woo Lee) 한국진로교육학회 2016 진로교육연구 Vol.29 No.2
본 연구는 대학생의 학업성취도를 예측하기 위하여 고교 학생부성적, 대학수학능력시험 성적, 대학학업 성취도 간의 종단적 관계를 대학입학전형별로 분석하는 것을 목적으로 하였다. 이를 위해 A대학교의 2011학년도부터 2014학년도까지의 신입생 중 모든 데이터가 있는 2,207명의 자료를 분산분석, 상관분석, 다중회귀분석을 실시하였고, 이 중 389명의 자료를 잠재성장모형을 통해 종단적 관계분석을 실시하였다. 연구결과는 다음과 같다. 첫째, 모집전형별 고교 학생부성적은 수시전형이, 대학수학능력시험 성적은 정시전형이 가장 높게 나타났으며, 대학학업성취도는 모집전형 간 유의미한 차이가 없는 것으로 나타났다. 둘째, 최근 4년간 입학생의 고교 학생부성적, 대학수학능력시험 성적, 대학학업성취도 간에는 유의미한 상관관계가 있는 것으로 나타났다. 셋째, 고교 학생부성적과 대학수학능력시험 성적은 대학 1학년 1학기의 학업성취도에 정적인 영향을 미치지만, 그 영향력은 미미한 것으로 나타났다. 마지막으로 2011학년도에 입학한 학생을 대상으로 학년이 올라감에 따라 대학학업성취도가 선형적으로 변화하는 지를 살펴본 결과, 1학년 평점이 높을수록 이후 향상률은 낮아지는 것으로 나타났다. 고교 학생부성적, 대학수학능력시험 성적과 대학학업성취도 간의 종단적 관계를 살펴본 결과, 고교 학생부성적은 1) 대학평점 초기치에 유의미한 영향을 미치는 것으로 나타났으며, 2) 대학평점 변화율에는 유의미한 영향을 미치지 않는 것으로 나타났다. 대학수학능력시험 표준점수는 1)과 2) 모두에 유의미한 영향을 미치지 않는 것으로 나타났다. The study aims to analyze longitudinal relationships among high school grade, the college scholastic ability test scores, and university academic achievement by types of admission. The study analyzed the data obtained from 2,207 freshmen who matriculated A university from 2011 to 2014 through ANOVA, correlation analysis, multi-regression analysis. Also, the longitudinal relationships through latent growth model was used for 369 freshmen. The results were as follows. First, according to student recruitment strategies, high school grade of early decision admission had high and the college scholastic ability test scores appeared high in regular admission. Also, university academic achievement was no significant difference based on student recruitment strategies. Second, there were significant correlations among high school grade, the college scholastic ability test scores, and university academic achievement of freshmen over 4 years. Third, although high school grades and the college scholastic ability test scores had a significant effect on university academic achievement, the influence was slight. Lastly, as the higher university academic achievement of first year grades(of 2011 freshmen), the lower the rate of increase. Considering the longitudinal relationship among high school grade, the college scholastic ability test scores, and university academic achievement, high school grade had an significant effect on 1) initial value of university academic achievement, however, had no effect on 2) the rate of variation of university academic achievement. In addition, the college scholastic ability test scores had no effect on both 1) and 2).
개구부가 있는 현장타설 끼움벽의 내진성능에 관한 실험적 연구
이혜연 ( Lee Hye-yeon ),한병찬 ( Han Byung-chan ),윤현도 ( Yun Hyun-do ),최창식 ( Choi Chang-sik ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
Placement of Cast-In Place(CIP) shear walls within strategic bays of a structure appears to be a logical and economical method to strengthen a reinforced concrete frame and to stiffen a building in order to reduced architectural and mechanical damage, in building construction, opening the shear wall is usually used for access and service line such as transportation and equipments. It is known that the main parameters affecting structural behavior of shear wall with opening is size, location, reinforcements and existence of openings. This study investigates the seismic performance of cast-in place infilled shear walls with opening. Through the test results, it’s been observed that a location and shape of the openings highly affects the movements of the fracture in the ratio of opening.