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.

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>

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.

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.

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.

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.

홀로그램 학습 자료를 활용한 대학 수업의 효과성 탐색

최현준(Choi, Hyunjun),김누리(Kim, Nooree) 학습자중심교과교육학회 2018 학습자중심교과교육연구 Vol.18 No.24

본 연구는 가장 진보된 실감형 학습자료인 홀로그램을 이용한 대학 수업에서 학습자의 학습몰입, 학습만족도, 학업성취도에 어떤 차이가 있는지 살펴보고, 홀로그램을 활용한 수업의 경우 어떤 효과가 있는지를 확인하는데 목적이 있다. 본 연구의 대상 은 J지역 M대학의 디지털공학 수업을 수강하고 있는 학생 58명으로 이들을 실험집단과 통제집단으로 구분하였다. 그리고 실험집단에는 홀로그램 학습자료를 제공하였고 통제집단에는 홀로그램을 찍은 사진자료를 제공하였다. 그 결과 실험집단의 학습 몰입, 학습만족도, 학업성취도의 평균이 통제집단 보다 높았고, 학습몰입, 학습만족도는 그 차이가 유의미하게 나타났다. 또한 홀로그램 학습자료를 제공한 집단에서의 현존감, 사용성 태도, 학업성취도는 유의미한 상관을 보였지만 학습몰입, 학습만족과는 통계적으로 유의미한 관계를 보이지 않았다. 반면 사용성 태도는 모든 변인에 긍정적이고 유의미한 상관을 보였다.. 마지막으로 홀로그램 학습자료를 제공한 집단에서 현존감과 사용성 태도는 학습몰입, 학습만족도, 학업성취도에 영향을 미치는 것으로 확인되었다. 이러한 연구결과에 근거하여 대학생의 효과적인 수업을 위한 교수·학습 전략과 연구의 시사점을 제시하였다. The purpose of this study was to investigate the differences in learners learning flow, learning satisfaction, and achievement in hologram, which is a representative mixed reality learning material. The sample of this study were 58 students who were taking digital engineering classes at M university in J district and classified them into experimental group and control group. The experiment group provided hologram learning materials and the control group provided hologram photographs. As a result, the mean of learning flow, learning satisfaction, and achievement in the experimental group was higher than that of the control group, and the difference between learning flow and learning satisfaction was significant. In addition, there was a statistically significant relationship between the sense of presence and the achievement in the group that provided the hologram learning materials, but not the learning flow and the learning satisfaction. On the other hand, usability attitude showed a positive correlation with all variables. Finally, in the group that provided the hologram learning materials, the existing sense and usability attitude were found to affect learning flow, learning satisfaction, and academic achievement. Based on the results of this study, the suggestions of teaching and learning strategies and research for effective teaching of university students were suggested.

Voice Reminder : 사물 인터넷 플랫폼 기반의 음성메모 시스템

최현준(Hyunjun Choi),이헌주(Heonzoo Lee),원용관(Yonggwan Won) 한국디지털콘텐츠학회 2018 한국디지털콘텐츠학회논문지 Vol.19 No.10

Due to the wide spread of smartphones, various scheduler systems have been developed on the smartphone. In recent years, artificial intelligence technologies are integrated into the systems for intelligent scheduler. The current scheduler systems are, however, difficult to detect indoor location of an user because it is mostly based on the GPS of smartphone for location detection. In order to overcome the limitation, we have developed a scheduler system that enables to detect indoor location of an user using internet of thing platform. And the system also provides voice memo and alarm at specified time point. In this paper, we confirmed that proposed method operates properly and has utility by implementing system prototype. In conclusion, we believe that proposed system using internet of thing and voice memo can contribute to develop personalized scheduler system in indoor environments.

무선 애드혹 네트워크 환경에서의 PSM 성능 실험 및 측정

최현준(Hyunjun Choi),김근우(Geunwoo Kim),정인수(Insu Jeong),마중수(Joongsu Ma) 한국통신학회 2004 한국통신학회 학술대회논문집 Vol.2004 No.7