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최형진(HyungJin CHOI),오영환(YungHvan OH),安居院 猛(T. AGUI),中嶋 正之(M. NAKAJJMA) 한국정보과학회 1987 한국정보과학회 학술발표논문집 Vol.14 No.1
화상정보처리에 이용되는 하프變換의 문제점인 기억용량과 처리時間을 消減시키기 위해, 필자들은 이전 파라미터平面 領域制限 하프 (HOUGH) 變換을 提案했다. 本稿에서는, 피라미드構造化를 이용한 하프變換을 사용하여, 더욱 高速으로 처리하는 方法에 대해서 논한다. 먼저, 原畵像을 피라미드構造化하여 抽出對象의 候補直線群을 구하고, 候補直線群에 대응하는 原畵像의 領域을 구하는 方法에 대해서 논한다. 자동화 번호판상의 숫자, 즉 차량番號의 認識은, 유료도로나 주차장의 요금소등에서 유효하게 사용될 것으로 예상된다. 本稿에서는 그 전단계로, 우선 자동차 번호판의 領域을 抽出하는 高速化 方法에 대해서 기술한다.
극초단파(마이크로파)와 첨가제를 이용한 오염토양 내 준휘발성 유기오염물질 제거
정상조,최형진,Jeong, Sangjo,Choi, Hyungjin 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.1
To improve the energy efficiency of conventional thermal treatment, soil remediation with microwave has been studied. In this study, the remediation efficiency of contaminated soil with semi-volatile organic contaminants were evaluated with microwave oven and several additives such as water, formic acid, iron powder, sodium hydroxide (NaOH) solution, and activated carbon. For the experiment, loamy sand and sandy loam collected from Imjin river flood plain were intentionally contaminated with hexachlorobenzene and phenanthrene, respectively. The contaminated soils were treated with microwave facility and the mass removals of organic contaminants from soils were evaluated. Among additives that were added to increase the remediation efficiency, activated carbon and NaOH solution were more effective than water, iron powder, and formic acid. When 10 g of hexachlorobenzene (142.4 mg/kg-soil) or phenanthrene (2,138.8 mg/kg-soil) contaminated soil that mixed with 0.5 g iron powder, 0.5 g activated carbon and 1 ml 6.25 M NaOH solution were treated with microwave for 3 minutes, more than 95% of contaminants were removed. The degradation of hexachlorobenzene during microwave treatments with additives was confirmed by the detection of pentachlorobenzene and tetrachlorobenzene. Naphthalene and phenol were also detected as degradation products of phenanthrene during microwave treatment with additives. The results showed that adding a suitable amount of additives for microwave treatments fairly increased the efficiency of removing semi-volatile soil organic contaminants.
Palladium 촉매와 포름산을 활용한 액상 trinitrotoluene 분해 특성 연구
정상조 ( Sangjo Jeong ),최형진 ( Hyungjin Choi ),박상진 ( Sangjin Park ),이준일 ( Juneil Lee ) 한국물환경학회 2015 한국물환경학회지 Vol.31 No.5
Various methods to degrade explosives efficiently in natural soil and water that include trinitrotoluene (TNT) have been studied. In this study, TNT in water was degraded by reduction with palladium (Pd) catalyst impregnated onto alumina (henceforth Pd-Al catalyst) and formic acid. The degradation of TNT was faster when the temperature of water was high, and the initial TNT concentration, pH, and ion concentration in water were low. The amounts of Pd-Al catalyst and formic acid were also important for TNT degradation in water. According to the experimental results, the degradation constant of TNT with unit mass of Pd-Al catalyst was 8.37 min-1g-1. The degradation constant of TNT was higher than the results of previous studies which used zero valent iron. 2,6-diamino-4-nitrotoluene and 2-amino-4,6-dinitrotoluene were detected as by-products of TNT degradation showing that TNT was reduced. The by-products of TNT were also completely degraded after reaction when both Pd-Al catalyst and formic acid existed. Even though there are several challenges of Pd-Al catalyst (e.g., deactivation, poisoning, leaching, etc.), the results of this study show that TNT degradation by Pd-Al catalyst and formic acid is a promising technique to remediate explosive contaminated water and soil.
인텔리전트 타이어 및 범용타이어 시뮬레이터 개발에 관한 연구
김회용(Hoiyoung Kim),최형진(Hyungjin Choi),노기한(Kihan Noh) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Tires keep the weight of the vehicle basically and run vehicle also change its direction. Therefore tires are important parts which have an effect on vehicle dynamics by direct contact with road surface. In this paper the Tire Simulator has been developed for Intelligent Tire which has being studied for few years and conventional tire. The Tire Simulator is capable of regenerate all forces which may occur to tire when it runs. So It can be used for the reliability and basic performance test for Intelligent Tire System and conventional tire. This paper also include the test of performance and reliability for Tire Simulator itself.
Exploring Digital Phenotypes of Emotional Eating Behavior Patterns in Reddit Online Community
Youjin Hwang(황유진),Hyungjun Kim(김형준),Hyungjin Choi(최형진),Joonhwan Lee(이준환) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2
Emotional eating is one of critical factors hindering the success of weight management. Even though people with emotional-eating behavior pattern are vulnerable to physical and psychological diseases such as obesity and depression, they tend to rarely seek professional assistance before they are in serious condition. Thus, it is challenging to give appropriate intervention or feedback to people with emotional eating behavior. However, some emotional eaters share their experiences and seek help in online community. We have explored the emotional eating (EE) pattern in /r/loseit online community, which is one of the sub-communities of Reddit, sharing information or experiences related to weight management such as food intake, exercise, medication, etc. Latent dirichlet allocation (LDA) was used for multi-dimensional topic modeling of the EE posts and comments. Based on the analysis, we are going to draw design implications to develop emotional eating feedback bot (EEF bot) which can give on-time and efficient feedback to emotional eaters.