제어기 공용화를 위한 LED 헤드램프 제어용 플랫폼 통합제어기 개발

박충섭(Choongseob Park),박동서(Dongseo Park),이은정(Eunjung Lee),김대현(Daehyun Kim),손유진(Yoojin Son),최윤석(Yunsuk Choi4),박상현(Sanghyun Park),문주환(Juwhan Moon),노태선(Taesun Rho),강소정(Sojeong Kang),이동주(Dongju Lee),김영수(You 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6

For the LED front lamp system, Universal Controller is gradually getting expanded in the world. For corresponding the technical trend and system optimization, we have approached in terms of vehicle level as well as LED load level. By understanding lamp system architecture and hardware functional distribution, we could make discrete LDMs into Universal LDM based on CAN communication. It enables us to control LED lamp very flexible and scalable with regardless of lamp variation depend on regional and specified option. Additionally, it is very compatible with future technologies such as pixel and matrix control in connection with autonomous driving.

A Notation Method for Three Dimensional Hand Gesture

Eunjung Choi,Heejin Kim,Min K. Chung 대한인간공학회 2012 大韓人間工學會誌 Vol.31 No.4

Objective: The aim of this study is to suggest a notation method for three-dimensional hand gesture. Background: To match intuitive gestures with commands of products, various studies have tried to derive gestures from users. In this case, various gestures for a command are derived due to various users" experience. Thus, organizing the gestures systematically and identifying similar pattern of them have become one of important issues. Method: Related studies about gesture taxonomy and notating sign language were investigated. Results: Through the literature review, a total of five elements of static gesture were selected, and a total of three forms of dynamic gesture were identified. Also temporal variability(reputation) was additionally selected. Conclusion: A notation method which follows a combination sequence of the gesture elements was suggested. Application: A notation method for three dimensional hand gestures might be used to describe and organize the user-defined gesture systematically.

Development of SS-AG20-loaded Polymeric Microparticles by Oil-in-Water (o/w) Emulsion Solvent Evaporation and Spray Drying Methods for Sustained Drug Delivery

Eunjung Choi,Cheng Zhe Bai,Areum Hong,박종상 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.10

Controlled drug delivery systems employing microparticles offer lots of advantages over conventional drug dosage formulations. Microencapsulation technique have been conducted with biodegradable polymers such as poly(lactic-co-glycolic acid) (PLGA) and poly(lactic acid) (PLA) for its adjustable biodegradability and biocompatibility. In this study, we evaluated two techniques, oil-in-water (o/w) emulsion solvent evaporation and spray drying, for preparation of polymeric microparticles encapsulating a newly synthesized drug, SSAG20, for the long-term drug delivery of this low-molecular-weight drug with a very short half-life. Drugloaded microparticles prepared by the solvent evaporation method showed a smoother morphology; however, relatively poor encapsulation efficiency and drastic initial burst were discovered as drawbacks. Spray-dried drug-loaded microparticles had an imperfect surface with pores and distorted portions so that its initial burst was critical (70.05-87.16%) when the preparation was carried out with a 5% polymeric solution. By increasing the concentration of the polymer, the morphology was refined and undesirable initial burst was circumvented (burst was reduced to 35.93-74.85%) while retaining high encapsulation efficiency. Moreover, by encapsulating the drug with various biodegradable polymers using the spray drying method, gradual and sustained drug release, for up to 2 weeks, was achieved.

Political Corruption, Trust, and Citizen Evaluations of Democracy : A Cross-National Analysis

EUNJUNG CHOI 이화여자대학교 국제통상협력연구소 2014 Asian International Studies Review Vol.15 No.2

Extensive literature on political corruption has addressed how pervasive corruption poses challenges to economic development, distributive justice, and political trust. While there is little doubt about the damaging effects of corruption on economic and political spheres, not much attention is given to the broader consequences of corruption and declining political trust on different facets of democratic governance. This study explores the reciprocal relationships between political corruption and various aspects of the health of democracy, as indicated by political trust and the performance of government as well as by citizens’ beliefs in democratic values, norms, and practices. This study finds that political corruption and political trust influence each other and that they, in turn, affect citizens’ opinion of democracy. The study also implies that political corruption brings detrimental effects to the deepening and consolidation of democracy in developing nations.

Color Change of Esthetic Restorative Materials for Different Staining and Whitening Dentifrices

( Eunjung Choi ),( Hyeonsoo Jang ),( Yelim Seo ),( Youngju Kim ),( Gayoung Lee ),( Youlim Kim ),( Soo-jeong Hwang ) 한국치위생과학회 2021 치위생과학회지 Vol.21 No.3

Background: As the importance of the esthetic function of teeth increases, the use of esthetic restoration materials and whitening treatment are increasing. The purpose of this study was to investigate the color change of esthetic restoration materials upon using staining and whitening toothpaste. Methods: Light curing (LC) packable composite resin, LC flowable resin, LC glass ionomer (GI), and self-curing GI specimens were colored in coffee or curry for three hours a day for seven days. After that, regular toothpaste, whitening toothpaste containing hydrogen peroxide, and whitening toothpaste containing activated charcoal were applied for three minutes three times a day for two weeks. Luminosity (L), chromaticity a (a), and chromaticity b (b) were measured using a spectrophotometer once a week. Results: In the coffee-colored group, the change in L²*a²*b² (E²) with time was significant (p=0.004), there was no difference for different toothpaste types (p=0.646), and there was significant difference (p<0.001) for different esthetic restorative materials. The change of E² in the curry-colored group was significant only for different esthetic restorative materials (p<0.001). In the coffee-colored group, the L, a, and b values of the light-curing GI showed greater change than other materials after staining and one week after whitening, turning dark, red, and yellow. In the curry-colored group, L did not differ for different materials and times, and a and b showed the greatest difference in light-curing GI after staining and one and two weeks after whitening. Conclusion: The use of whitening toothpaste for two weeks was not different from the use of general toothpaste in the removal of staining or whitening. Since light-curing GI is the most vulnerable to coloration, it is recommended that coloring by food chromogen should be explained in advance, before using light-curing GI for teeth restoration.

Bureaucrats’ Perception of Corruption and Political Trust in South Korea

Eunjung Choi,Jongseok Woo 한국학술연구원 2015 Korea Observer Vol.46 No.4

This article examines how government officials’ perceptions of corruption affect the evaluation of government effectiveness and political trust and whether the outcomes are different from ordinary citizens. On the one hand, one may expect that bureaucrats share with citizens the belief that perceptions of corruption harm their evaluations of government effectiveness and trust in government because they are also members of the society. On the other hand, bureaucrats may be more tolerant of corruption than ordinary citizens because, while the latter are victims of corruption and therefore express negative judgments of it, the former are possible beneficiaries. Through the empirical analysis of data collected in South Korea, the article suggests that bureaucrats’ perceptions of corruption lower their evaluations of overall government effectiveness and trust in government institutions. Although bureaucrats’ job-related factors bring nuances in terms of those causal relations, the overall outcomes affirm previous studies of the high corruption-low trust linkage among ordinary citizens.

Confucian Legacies and the Meaning of Democracy in South Korea : A Cultural Interpretation

Eunjung Choi,Jongseok Woo 한국학술연구원 2018 Korea Observer Vol.49 No.3

Whether Confucianism is compatible with liberal democracy has been a topic of heated debate among scholars and politicians alike, but with little meticulous empirical analysis. The incompatibility thesis, represented by the Asian value argument, suggests that as a political culture Confucianism hinders the deepening of democracy in Confucian Asian countries. The compatibility or convergence thesis, in contrast, argues that Confucianism is compatible with, and even compensates for the shortcomings of liberal democracy. This article investigates the relationship between South Koreans’ attachment to Confucian values and their attitudes towards a (non)democratic form of government. Unlike previous studies that treat Confucianism as a unitary value system, this article argues that Confucianism is multifaceted - its teachings on social hierarchy, morality, primacy of community, and social harmony - have different relationships with democratic and authoritarian values. This empirical analysis demonstrates that, at least in South Korea, certain Confucian values are compatible with democratic values of political participation and individual rights and liberty. In contrast to previous literature that focuses on institutional and performance variables as key variables that explain individual attachment to (non)democratic forms of government, this study illustrates that culture has consistent and long-lasting impacts on individual political orientations.

Research on developing a text-based notation method for user-defined hand gestures

Eunjung Choi,Heejin Kim,Sung H.Han,Min K. Chung 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.11

Objective: The aim of this study is to develop a text-based notation method for recording 3D free hand gesture vocabularies and to verify the notation method via a case study. Background: Lately, various research has involved users in the process of defining the gestures to enhance the naturalness of the gesture vocabularies. To record the user-defined gestures for the post analysis, the video recording has been mainly utilized in the various studies. However, to compare the various gestures, a researcher should observe the video repeatedly which requires time and effort cost. Method: We devised a text-based notation method based on 3D free hand gesture taxonomy developed in our previous study. To verify the text-based notation method, we conducted experiments: acquisition of hand gestures by users, notating the user-defined gestures by users and decoding the notated gestures by a new group of users. Results: Except for the arm posture of several gestures, users can notate the gestures and decode the gestures correctly. Conclusion: This study will contribute to the establishment of a systematic approach for organizing hand gesture vocabularies. Application: The text-based notation method would help a researcher to fine what he/she wants to identify at a glance without any extra system, such as a computer.

Political Communication and Individuals’ Attitudes toward Corruption in the United States

Eunjung Choi(최은정) 21세기정치학회 2019 21세기 정치학회보 Vol.29 No.4

The Decline and Resurgence of the Kuomintang in Taiwan

Eunjung Choi 인하대학교 국제관계연구소 2015 Pacific Focus Vol.30 No.3

What explains the decline and resurgence of dominant parties? While economic performance, policy adaptation, electoral rules, and generational replacement have been offered as common causes for the decline of one-party dominance, the case of Taiwan challenges those prevailing explanations. This paper focuses on how partisan splits from the Kuomintang (KMT) and their (dis)coordination with the KMT first undermined and then recovered the KMT’s dominance. Furthermore, this study pays particular attention to cross-strait relations in shaping the dynamics of electoral coalitions in Taiwan. This study argues that China’s military threat and Taiwan’s deepening economic integration to the Mainland, along with other international forces, have influenced Taiwanese public opinion on cross-strait policy and have thus affected electoral coalition formation and the electoral fortunes of the KMT.