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단축질소 제거공정에서의 N_(2)O gas 발생특성에 관한 연구
황선진,장현섭 경희대학교 자연과학종합연구원 2002 자연과학논문집 Vol.8 No.-
아산화질소는 생물학적 질소제거 공정에서 부산물로서 발생하는 지구온난화 가스이다. 용존산소, 체류시간, C/N비, 질산성 질소와 아질산성 질소의 축적과 같은 많은 인자가 폐수처리시스템에서 N_(2)O 방출을 좀 더 나은 해석을 위해서 연구되어 왔다. 유입 암모니아 농도는 500∼700㎎/ℓ이었고 수리학적 체류시간은 1.5일, 슬러지 체류시간은 20일로 하였다. 이때 암모니아 제거율은 90%이상이었고 단축질소제거공정에서 일반 질소제거공정보다 N_(2)O가 좀 더 많이 방출된다는 것이 이번 연구로 밝혀졌다. Nitrous oxide(N_(2)O) can be emitted as a by-product of nitrogen removal from wastewater. Many parameters such as the concentration of dissolved oxygen, retention time, C/N ratio as a limiting influent carbon source, the accumulation of nitrate or nitrate, have been investigated to gain a better understanding of N_(2)O gas emissions in wastewater treatment systems. The average ammonia oxidation efficiency was over 90% and the influent NH_(4)^(+)-N concentration was in the range of 500-700mg/ℓ. Hydraulic retention time(HRT) was 1.5days and solid retention time (SRT) was more than 20 days in all the bioreactors. A study on releasing patterns showed that higher N_(2)O emission was at a Shortcut Biological Nitrogen Removal process(SBNR) than a general nitrogen removal process.
Pose-invariant Face Recognition
Sunjin Yu,Joongrock Kim,Jinkyu Hwang,Sangyoun Lee 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
Pose-variation problem, there are various approaches for a 3D face recognition system which is able to use depth information. However, this created another head-pose estimation problem in terms of normalizing the 3D face data. This paper presents a pose-invariant face recognition system using an iterative feature-based 3D head pose-estimation. The proposed method uses 2D information with the AAM(Active Appearance Model) and 3D information with a 3D facial normal vector for a 3D face data. In order to verify the performance of the proposed method, we decompose rotational properties of 3D face database using the proposed iterative 3D head pose-estimation method and design two different experiments. Experimental results show that the proposed method is robust against pose variation.
친환경 추진제를 사용하는 액체로켓엔진 점화기의 설계 및 운용 조건이 점화 특성에 미치는 영향
황오식(Ohsik Hwang),김태완(Taewoan Kim),전준수(Junsu Jeon),고영성(Youngsung Ko),김유(Yoo Kim),김선진(Sunjin Kim) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.11
본 연구에서는 과산화수소/케로신 촉매 점화기의 최적 설계를 위하여 점화기 설계와 운용 조건에 따른 점화 특성을 확인하였다. 그 결과 촉매대의 출구 면적은 분해된 가스가 쵸킹이 발생하지 않도록 충분하여야 하며, 케로신은 촉매대 중앙에서 미립화가 잘되도록 분무하여야 함을 확인하였다. 또한 점화기를 운용하는데 있어 예열이 없을 경우 과산화수소를 약 3초 정도 리드해야 하며, 퍼지는 케로신 공급과 같거나 늦게 공급하는 것이 바람직함을 확인하였다. Ignition performance tests were performed to develop a catalytic ignitor which used hydrogen peroxide and kerosene. Ignition characteristics were investigated by exit area of the catalytic bed, shape of kerosene injector and lead time of purge gas. The results showed that exit area of catalytic bed must be enough for non chocking condition and kerosene must be sprayed with swirl in the middle of catalytic bed. Also in case without preheating of catalytic bed, hydrogen peroxide must be leaded by 3sec, and purge gas must be supplied simultaneously or lately with kerosene.
Calibration between a Camera and Laser for 3D Modeling
Joongrock Kim,Sunjin Yu,Kyungmin Lim,Jinkyu Hwang,Sangheon Park,Sangyoun Lee 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
This paper presents a method for calibration between a camera and a grid pattern laser based on flexible camera calibration proposed by Zhang. Recently, the 3D data acquisition system which composed of a camera and a laser receives much attention to make it smaller and cheaper. In order to reconstruct 3D scene by the system consisting of a camera and a laser, laser planes which are emitted by the laser should be precisely estimated. By the proposed methods, we estimated accurate laser planes and performed 3D reconstruction.
Face Recognition based on Non-intrusive 3-D Face Modeling System
Joongrock Kim,Sunjin Yu,Jinkyu Hwang,Sooyeon Kim,Sangyoun Lee 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper proposes a nonintrusive three-dimensional (3-D) face data acquisition and face recognition system. Although a two-dimensional (2-D) face recognition system can achieve a reliable recognition rate, its performance can be degraded by illumination and pose variation. To eliminate these factors in 2-D face recognition, 3-D face recognition which uses 3-D face data has received much attention. To acquire accurate 3-D face data, we develop the nonintrusive 3-D face acquisition system consisting of a stereo vision system and an invisible 850 nm near-infrared line laser. By using 3-D face data, 2.5-D face recognition is performed to verify the recognition performance. The experiment results show the reconstructed 3-D face data consisting of about 30,000 3-D points and the recognition rate is 96%.
소비자 자기관, 의류 브랜드의 가격과 가격할인 판매촉진유형이 여성복의 구매의도에 미치는 영향
조규빈 ( Kyubin Cho ),황선진 ( Sunjin Hwang ) 한국패션비즈니스학회 2016 패션 비즈니스 Vol.20 No.5
The study aims to explore the impacts of types of consumer`s self-construal, prices of brands, and types of discount-based sales promotion on consumers` purchase intention. For this study, a three-way mixed factor method was applied based on a formula, types of consumer`s self-construal x prices of brands x types of discount-based sales promotion. The subjects were 218 females in their 20s to 30s living in seoul or Gyeonggi-do areas. For data analysis, three-way variate analysis, analysis of simple interactions and analysis of simple main impacts were conducted through use of the SPSS program. First, based on the impacts of types of consumer`s self-construal, prices of brands, and types of discount-based sales promotions in the favor of consumers, there was a significant difference between higher and lower-priced brands. Second, comprehensive discounts rather than monopolistic discounts corresponded to higher favoring by consumers of interdependent self-construal. As for monopolistic discount, lower-priced products corresponded to higher favor than higher-priced ones. Third, there was a significant difference between consumers of independent self-construal and interdependent self-construal. Fourth, comprehensive discount, rather than monopolistic discount, corresponded to higher purchase intention regardless of prices of brands in the group of consumers with interdependent self-construal.
소셜커머스에서 부정적 리뷰 유형, 브랜드 명성, 기회희소성지각이 패션제품 선호도에 미치는 영향
주보라 ( Bora Joo ),황선진 ( Sunjin Hwang ) 한국패션비즈니스학회 2016 패션 비즈니스 Vol.20 No.4
This study aims to analyze the impact of negative review type, brand reputation and opportunity scarcity perception, on preferences of fashion products in social commerce. For the above evaluation, we used the 2 (negative review type: objective/subjective) X 2 (brand reputation: high/low) X 2 (opportunity scarcity perception: high/low) model, designed with three mixed elements. We enrolled 260 women in their 20s and 30s, who live in Seoul and have used social commerce; a final total of 207 subjects were considered for analysis. The data were analyzed using the SPSS 18 program and reliability test, t-test and three-way ANOVA were performed. Following observations were made: First, preferences were higher when the subjects read objective negative reviews than subjective negative reviews, and when a fashion product was from a brand of high reputation than a brand of low reputation. Second, the interaction effect between negative review type and brand reputation was greater among the subjects whose opportunity scarcity perception is high, than those having low opportunity scarcity perception. Thus, we conclude that the social commerce should encourage consumers to write more objective reviews, and fashion brands should manage their reputations well. Also, social commerce can use scarcity messages aggressively to increase preferences of global fashion luxury goods, which is actively marketed in social commerce since 2015.
이정진 ( Jungjin Lee ),황선진 ( Sunjin Hwang ) 한국패션비즈니스학회 2018 패션 비즈니스 Vol.22 No.5
As the paradigm of fashion retail industry moves rapidly to the multi-channel, the role of shop master has changed as well. Therefore, the purpose of this study is to examine in-depth the changing role of shop masters in multi-channel retail paradigms. In-depth interviews were conducted, and all interviews were recorded with permission. Seven shop masters participated in in-depth interviews. All of them were sales specialists, with more than 10 years working experience, at department stores. Results of this study are as follow: First, the roles of a multi-channel shop master include store management, management of sales associates, customer relationship management, and management in relation to the headquarters and suppliers. Second, the most important competencies of shop masters are to forecast future demand, establish information networks, communicate well with others, and create a work environment resulting in higher productivity.