광고사진의 표현 형식이 광고효과에 미치는 영향 - 국내 가전제품 인쇄광고를 중심으로

심현준 ( Sim¸ Hyunjun ),최종인 ( Choi¸ Jongin ) 현대사진영상학회 2021 현대사진영상학회논문집 Vol.24 No.2

The expression method of advertising photos is the work of systematically and rationally structuring expression elements so that advertising messages can be effectively delivered to consumers. By analyzing case studies and consumer reactions to the expression methods of photos appearing in advertisement images for home appliances, we try to suggest standards for how the characteristics of expression are used in advertisement pictures and how to classify advertisement pictures preferred by consumers. To this end, a classification framework for expression forms shown in advertisement photos was presented, and advertisement images of domestic home appliances were collected and analyzed by product type and release year. The representative advertisement photo expression method derived from the preliminary study was applied to the experimental object to conduct a factor design survey between 2x3 groups. As a result of the preliminary study, it was confirmed that the expression form was changed to emphasize the naturalness of everyday life. As a result of the main study, differences occurred in product attitudes and purchase intentions in the expression form of TV advertisement images, and differences occurred in the types of visual metaphors in advertisement attitudes, product attitudes and purchase intentions. As for the expression form of refrigerator advertisement image, there was a difference in product attitude and purchase intention in the visual metaphor type, and there was a difference in the advertisement effect of the expression form and visual metaphor type according to the properties of home appliances. Through this study, it is expected that it can contribute to the development of advertising photos as practical data for advertising image production by preparing standards for predicting consumer preferred advertising photo expression methods at the stage of advertising production.

Excessive dietary lead reduces growth performance and increases lead accumulation in pigs

Choi, Hyunjun,Ji, Sang Yun,Jo, Hyunwoong,Song, Minho,Kim, Beob Gyun Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.1

Objective: The objective of this study was to investigate the influence of dietary lead (Pb) supplementation and feeding period on growth performance, organ weight, and Pb accumulation in pigs. Methods: In a 56-day feeding experiment, a total of 48 barrows with initial body weight 10.4±0.6 kg were allotted to 2 dietary treatments (0 and 200 mg/kg of supplemental Pb) in a completely randomized design with 6 replicates. Body weight and feed intake were recorded to calculate growth performance. At the end of each 14 day-period (on days 14, 28, 42, and 56), an animal was randomly selected from each pen and slaughtered to collect blood samples, hair samples, left 5th rib, heart, liver, kidneys, lungs, and longissimus dorsi muscle samples. Results: Average daily gain and average daily feed intake were reduced (p<0.05) by supplemental Pb during the day 42 to 56. Relative kidney weight to body weight was linearly increased with increasing feeding period in pigs fed the Pb-supplemented diet, but not in pigs fed the control diet (p<0.05). The Pb concentrations in hair, left 5th rib, kidneys, and lungs were linearly increased with longer feeding period in pigs fed the Pb-supplemented diet, but not in pigs fed the control diet (p<0.01). Conclusion: Dietary Pb supplementation caused growth retardation and Pb accumulation in most organs, particularly in hair, bone, and kidneys in a time-dependent manner.

Bias-Dependent Effective Channel Length for Extraction of Subgap DOS by Capacitance–Voltage Characteristics in Amorphous Semiconductor TFTs

Hyunjun Choi,Jungmin Lee,Hagyoul Bae,Sung-Jin Choi,Dae Hwan Kim,Dong Myong Kim Institute of Electrical and Electronics Engineers 2015 IEEE transactions on electron devices Vol. No.

<P>Bias-dependent effective channel length [L-eff(V-G)] is empirically modeled with a channel conduction factor [alpha(V-G)] for a consistent capacitance-voltage (C-V) characterization of the intrinsic subgap density of states (DOS) over the bandgap with the sub-bandgap photoresponsive C-V technique in amorphous thin-film transistors. We define the effective channel length L-eff(V-G) through the product of the empirical channel conduction factor [alpha(V-G)] and the metallurgical channel length (L-m). We confirm that the gate bias-dependent channel conduction effect is significant in the subgap DOS far from the conduction band edge (E-C) due to the low conductivity of the channel under subthreshold bias.</P>

Amino acid supplementation during the adaptation period did not affect the standardized ileal digestibility of amino acids in corn and soybean meal fed to pigs

Choi Hyunjun,You Sun Jong,김법균 아세아·태평양축산학회 2024 Animal Bioscience Vol.37 No.3

Objective: The objective was to determine the influence of amino acid (AA) supplementation during the adaptation period on the ileal digestibility of crude protein and AA in corn and soybean meal (SBM) fed to pigs. Methods: Six barrows with an initial body weight of 30.9±2.6 kg fitted with a T-cannula at the distal ileum were assigned to a 6×6 Latin square design with 6 dietary treatments and 6 periods. Two experimental diets contained corn or SBM as the sole AA source and an N-free diet was additionally prepared. For AA supplementation groups, an AA mixture consisted of Gly, Lys, Met, Thr, Trp, Ile, Val, His, and Phe was added to the corn diet and the N-free diet at the expense of cornstarch, and an AA mixture of Lys, Met, and Thr was added to the SBM diet. All diets contained 0.5% of chromic oxide. The 6 experimental diets were fed to the pigs for four and half days, and the 3 diets containing an AA mixture were switched to the respective diets without AA mixture during the following two and half days. Ileal digesta were collected on days 6 and 7. Results: The addition of an AA mixture during the adaptation period increased apparent ileal digestibility of Arg and Trp in corn (p<0.05) but did not affect that in SBM. The addition of an AA mixture during the adaptation period increased apparent ileal digestibility of Pro and Gly regardless of feed ingredient (p<0.05) but did not affect that of other AA. All AA except Pro in corn and SBM were unaffected by the addition of the AA mixture during the adaptation period. Conclusion: The addition of amino acids to a low-protein diet during the adaptation period does not affect the standardized ileal digestibility of indispensable amino acids in pigs.

Hybrid modulation strategy of three-phase dual-active-bridge converter to improve power conversion efficiency under light load conditions in LVDC applications

Choi, Hyunjun,Jung, Jeehoon The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.4

A hybrid control strategy for the three-phase dual-active-bridge (3P-DAB) converter of LVDC applications is presented to improve the power conversion efficiency under light load conditions. The 3P-DAB converter is an attractive topology for high-power applications such as railway traction and aircraft due to its inherent the zero voltage switching (ZVS) capability and reduction of conduction loss due to an interleaved structure with seamless bi-directional power transitions. However, conventional phase shift modulation (PSM) applied to a 3P-DAB converter has disadvantages such as ZVS failure under light load conditions. In this paper, an asymmetrical pulse width modulation is inserted into PSM to replace the existing modulation algorithm of a 3P-DAB converter with a simple control approach. In the proposed control, the transferred power can be calculated according to the mode changes. In addition, the soft switching area of the power switches can be expanded by the proposed hybrid control strategy. Finally, experimental results validate the proposed hybrid modulation strategy using a 3-kW prototype 3P-DAB converter.

Neutral detergent fiber rather than other dietary fiber types as an independent variable increases the accuracy of prediction equation for digestible energy in feeds for growing pigs

Choi, Hyunjun,Sung, Jung Yeol,Kim, Beob Gyun Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.4

Objective: The objectives were to investigate correlations between energy digestibility (digestible energy [DE]:gross energy [GE]) and various fiber types including crude fiber (CF), total dietary fiber (TDF), soluble dietary fiber (SDF), insoluble dietary fiber (IDF), neutral detergent fiber (NDF), and acid detergent fiber (ADF), and to develop prediction equations for estimating DE in feed ingredients and diets for growing pigs. Methods: A total of 289 data with DE values and chemical composition of feeds from 39 studies were used to develop prediction equations for DE. The equations were validated using values provided by the National Research Council. Results: The DE values in feed ingredients ranged from 2,011 to 4,590 kcal/kg dry matter (DM) and those in diets ranged from 2,801 to 4,203 kcal/kg DM. In feed ingredients, DE:GE was negatively correlated (p<0.001) with NDF (r = -0.84), IDF (r = -0.83), TDF (r = -0.82), ADF (r = -0.78), and CF (r = -0.72). A best-fitting model for DE (kcal/kg) in feed ingredients was: 1,356 + (0.704 × GE, kcal/kg) - (60.3 × ash, %) - (27.7 × NDF, %) with R² = 0.80 and p<0.001. In diets, DE:GE was negatively correlated (p<0.01) with NDF (r = -0.72), IDF (r = -0.61), TDF (r = -0.52), CF (r = -0.45), and ADF (r = -0.34). A best-fitting model for DE (kcal/kg) in diets was: 1,551 + (0.606 × GE, kcal/kg) - (22.1 × ash, %) - (25.6 × NDF, %) with R² = 0.62 and p<0.001. All variables are expressed as DM basis. The equation developed for DE in feed ingredients had greater accuracy than a published equation for DE. Conclusion: All fiber types are reasonably good independent variables for predicting DE of swine feeds. The best-fitting model for predicting DE of feeds employed neutral detergent fiber as an independent variable.

실감형 학습자료를 활용한 대학 수업의 효과

최현준(Choi, Hyunjun),박분희(Park BunHee),김누리(Kim, Nooree) 학습자중심교과교육학회 2020 학습자중심교과교육연구 Vol.20 No.1

This study examines the differences in learners cognitive load, class participation, and academic achievement in university liberal arts classes learning materials, and examines the effects of classes using learning materials. The purpose is to. The subjects of this study were 90 students who were taking ‘Introductory to Psychology’ class at M university. They were divided into experimental group and control group. The experimental group was provided with realistic learning materials, and the control group was provided with general photographic data. As a result, the average of cognitive load, class participation, and academic achievement of the experimental group was higher than the control group. In addition, there was a significant correlation between presence, usability, cognitive load, and academic achievement of the experimental group, but there was no statistically significant relationship with class participation. Finally, presence and usability attitudes in the experimental group were found to affect cognitive load and academic achievement. Based on these findings, this study suggests teaching and learning strategies and research implications for effective teaching of college students. 본 연구는 실감형 학습자료를 이용한 대학 교양수업에서 학습자의 인지부하, 수업참여, 학업성취도에 어떤 차이가 있는지 살펴보고, 실감형 학습자료를 활용한 수업의 경우 어떤 효과가 있는지를 확인하는데 목적이 있다. 본 연구의 대상은 J지역 M대학의 심리학개론 수업을 수강하고 있는 학생 90명으로 이들을 실험집단과 통제집단으로 구분하였다. 그리고 실험집단에는 실감형 학습자료를 제공하였고 통제집단에는 일반적인 사진자료를 제공하였다. 그 결과 실험집단의 인지부하, 수업참여, 학업성취도의 평균이 통제집단 보다 높았다. 또한 실감형 학습자료를 제공한 집단에서의 현존감, 사용성 태도, 인지부하, 학업성취도는 유의미한 상관을 보였지만 수업참여와는 통계적으로 유의미한 관계를 보이지 않았다. 마지막으로 실감형 학습자료를 제공한 집단에서 현존감과 사용성 태도는 인지부하와 학업성취도에 영향을 미치는 것으로 확인되었다. 이러한 연구결과에 근거하여 대학생의 효과적인 수업을 위한 교수·학습 전략과 연구의 시사점을 제시하였다.

Polyacrylamide와 Gypsum을 이용한 토양유실에 관한 연구 - 지표피복재 변화 -

신현준 ( Hyunjun Shin ),원철희 ( Cheolhee Won ),최용훈 ( Yonghoon Choi ),신영태 ( Youngtae Shin ),최중대 ( Joongdae Choi ) 한국농공학회 2010 한국농공학회 학술대회초록집 Vol.2010 No.-

본 연구는 다양한 지표피복재를 이용하여 PAM과 Gypsum을 적용한 소규모 시험포에서 인공강우기에 의해 발생한 토양유실로 유사량과 부유물질(SS)농도를 측정하여 대조구와 비교하였다. 시험포에 사용된 토양은 고랭지 밭에서 쓰이는 것과 같은 토성으로 삼각분류법에 의해 사질롬으로 분류되었다. 실험처리의 경우 강우강도는 30 mm/hr와 60 mm/hr로 2처리되었고, 경사도는 10 %와 20 %로 2처리되었다. 시험포는 볏짚거적+톱밥+PAM+Gypsum, 볏짚거적+왕겨+PAM+Gypsum, 볏짚거적+PAM+Gypsum, 무처리로 총 4 종류로 구성하였다. 실험은 1주일 간격으로 3회 실시하였고, 각 실험 때 마다 1시간의 강우를 적용하였다. 실험결과 중 부유물질농도는 직접유출에 의한 값을 나타냈다. 실험 후 나타난 유사량은 대조구에서 다른 시험포에 비해 30mm/hr 강우강도와 10 %의 경사도 조건에서 약 547배∼16배 높은 값을 나타냈다. 대조구와 비교했을 시 가장 많은 차이를 보인 시험처리 값은 60 mm/hr 강우강도와 10 % 경사도를 적용했을 때 약 675배∼136배로 나타났다. 이는 시간당 60 mm의 큰 강우강도에서 경사도가 높을 때 보다 낮을 때 더 나은 효과를 볼 수 있음을 말해준다. 부유물질농도에서는 30 mm/hr 강우강도와 10 % 경사도 조건에서 대조구의 값이 27배∼9배로 지표를 피복한 시험포에 비해 높게 나타났다. 지표피복재별로 효과를 알아보면 유사 발생량은 볏짚거적+왕겨+PAM+Gypsum의 시험포가 가장 적게 나타났지만, 부유물질농도는 경사도에 따라 30 mm/hr 강우강도에서 볏짚거적+왕겨+PAM+Gypsum과 볏짚거적+PAM+Gypsum이 작은 값을 보였고, 60 mm/hr 강우강도에서는 볏짚거적+톱밥+PAM+Gypsum이 가장 작은 값을 나타냈다. 이는 부유물질의 저감효과에서 대조구와 비교했을 때 효과는 있지만 지표피복재 간 차이는 크지 않다는 것을 알 수 있다. 토양유실에 효과가 있는 두 화합물 PAM과 Gypsum을 이용한 지표피복재 실험은 국외 및 국내에서 연구한 사례가 미비한 실험으로 추후 현장 적용하여 연구할 경우 토양유실저감에 관한 성과를 기대해 볼 수 있다. 본 연구 결과는 경사지 밭및 기타 농촌 지역에서 토양유실을 저감하는데 주요한 자료로 활용될 수 있을 것이라 판단된다.

ICT 기반 전기자동차 충전 인프라 산업의 Value Chain과 책임 영역 구체화에 대한 고찰

최영석(Choi Youngsuk),김현준(Kim Hyunjun),최웅철(Choi Woongchul) 한국통신학회 2017 한국통신학회 학술대회논문집 Vol.2017 No.6

실거래가 기반 전세가격과 매매가격의 상관성 분석 : 수도권 부동산 시장 중심으로

최현준 ( Choi Hyunjun ),이창무 ( Lee Changmoo ) 한국부동산분석학회 2023 부동산분석학회 학술발표논문집 Vol.2023 No.1

본 연구는 수도권 부동산 시장에서 전세가격과 매매가격 간의 상관성을 심층적으로 분석하는 것을 목표로 한다. 이 연구는 서울, 경기, 인천 지역의 부동산 시장 데이터와 다양한 경제 지표들을 활용하여 2014년 1월부터 2023년 6월까지의 시간 범위에 걸쳐 전세가격과 매매가격 사이의 상호작용 및 선도-지연 관계를 조사한다. 연구 방법으로는 충격반응함수를 사용하여 데이터를 분석하며, 이를 통해 각 지역별 부동산 시장의 동향을 파악한다. 연구 결과에 따르면, 서울, 인천, 경기 지역에서 매매가격이 전세가격의 변화를 선도하는 중요한 역할을 한다는 것이 밝혀졌다. 서울시의 경우, 재고 및 입주물량, 준공물량 증가는 전세가격에 대한 매매가격에 비해 상대적으로 영향력이 작은 것으로 나타났다. 인천시에서는 재고 및 입주물량 증가가 전세가격 감소를 유발하며, 매매가격 변화에 비해 더 큰 영향을 미치는 것으로 분석되었다. 준공물량 증가는 전세가격에 거의 영향을 미치지 않는 것으로 보인다. 경기도에서는 재고 및 입주물량이 전세가격에 미치는 영향이 제한적이며, 준공물량 증가는 전세가격, 매매가격 모두 감소를 유발할 수 있으며, 이는 전세가격이 매매가격을 선도한다는 것을 나타낸다.