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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.
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.
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 L<sup>2</sup>*a<sup>2</sup>*b<sup>2</sup> (E<sup>2</sup>) 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 E<sup>2</sup> 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.
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.
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.
( Eunjung Choi ),( Bora Kang ),( Mingyu Lee ),( Seungjae Oh ),( Heejin Kim ),( Dong Yeong Jeong ),( Hanul Bang ),( M. K. Chung ),( S. H. Han ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-
Recent studies in gesture interfaces have focused on enhancing the naturalness of gesture vocabularies by utilizing users`experiences related to a command. However, the previous studies lack methods for organizing the user-defined gestures in a systematic manner. It is difficult to identify the important characteristics of the user-defined gestures for commands. The users`intentions of deriving a specific gesture for a command could be misinterpreted by the researchers. We propose a three-dimensional hand gesture taxonomy to resolve these issues. Further, we organized the user-preferred gestures that were acquired via two experiments. By subdividing the elements of each gesture, we were able to develop a new method for analyzing the important characteristics of gestures. This study proposes a novel and systematic approach to quantifying user-preferred gestures.
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.
Phaeophyta Extracts Exhibit Antiviral Activity against Feline Calicivirus
Choi, Yuri,Kim, Eunjung,Moon, Sunyoung,Choi, Jong-Duck,Lee, Myung-Suk,Kim, Young-Mog The Korean Society of Fisheries and Aquatic Scienc 2014 Fisheries and Aquatic Sciences Vol.17 No.1
The objective of this study was to evaluate the antiviral activity of Phaeophyta extracts against feline calicivirus (FCV), used as a norovirus surrogate. A bioassay-guided cytotoxicity and virus infectivity assay revealed that methanolic extracts of Phaeophyta possessed significant antiviral activity against FCV. Among them, Eisenia bicyclis extract exhibited the highest antiviral activity against FCV. The 50% effective concentration of the extract ($EC_{50}$) inhibiting FCV viral replication by 50% was $80{\mu}g/mL$. The extract also showed the highest selectivity index, calculated from the ratio of the median cellular cytotoxicity concentration ($CC_{50}$) and $EC_{50}$, indicating antiviral efficacy against FCV. In addition, significant interruption of FCV infection was observed by pretreatment of host Crandall-Reese feline kidney cells with the E. bicyclis extract ($200{\mu}g/mL$) prior to virus infection, in a dosedependent manner.
Eunjung Choi,Bora Kang,Mingyu Lee,Seungjae Oh,Heejin Kim,Dong yeong Jeong,Hanul Bang,M. K. Chung,S. H. Han 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5
Recent studies in gesture interfaces have focused on enhancing the naturalness of gesture vocabularies by utilizing users’ experiences related to a command. However, the previous studies lack methods for organizing the user-defined gestures in a systematic manner. It is difficult to identify the important characteristics of the user-defined gestures for commands. The users’ intentions of deriving a specific gesture for a command could be misinterpreted by the researchers. We propose a three-dimensional hand gesture taxonomy to resolve these issues. Further, we organized the user-preferred gestures that were acquired via two experiments. By subdividing the elements of each gesture, we were able to develop a new method for analyzing the important characteristics of gestures. This study proposes a novel and systematic approach to quantifying user-preferred gestures.