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Chulyoung Choi(최철영),Woongchul Choi(최웅철) 대한전기학회 2017 전기학회논문지 Vol.66 No.12
Global automobile manufacturers are developing electric vehicles (EVs) to eliminate the pollutant emissions from internal combustion vehicles and to minimize fossil fuel consumptions for the future generations. However, EVs have a disadvantage of shorter traveling distance than that of conventional vehicles. To answer this shortfall, more batteries are installed in the EV to satisfy the consumer expectation for the driving range. However, as the energy capacity of the battery mounted in the EV increases, the amount of heat generated by each cell also increases. Naturally, a better battery thermal management system (BTMS) is required to control the temperature of the cells efficiently because the appropriate thermal environment of the cells greatly affects the power output from the battery pack. Typically, the BTMS is divided into an active and a passive system depending on the energy usage of the thermal management system. Heat exchange materials usually include gas and liquid, semiconductor devices and phase change material (PCM). In this study, an application of PCM for a BTMS was investigated to maintain an optimal battery operating temperature range by utilizing characteristics of a PCM, which can accumulate large amounts of latent heat. The system was modeled using Dymola from Dassault Systems, a multi-physics simulation tool. In order to compare the relative performance, the BTMS with the PCM and without the PCM were modeled and the same battery charge/discharge scenarios were simulated. Number of analysis were conducted to compare the battery cooling performance between the model with the aluminum case and PCM and the model with the aluminum case only.
( Chulyoung Kim ) 한국산업조직학회 2016 한국산업조직학회 정책세미나 논문집 Vol.2016 No.1
After its landmark decisions Bell Atlantic v. Twombly and Ashcroft v. Iqbal, the Supreme Court allows federal judges to dismiss cases when the plaintiff``s allegations are conclusory or implausible, thereby increasing federal judges`` discretionary power in pleading stages of litigation. Using a stylized litigation model, I find the conditions under which the ruling improves litigation outcomes by simultaneously raising deterrence and reducing litigation costs and error costs. In particular, I demonstrate the ways in which the ruling``s effect depends on the correlation between potential injurers`` primary behavior and the strength of cases filed at trial courts.
Chulyoung Park,Hyejin Kim,Jaeyoung Ryu,Seunggon Jung,Hong-Ju Park,Hee-Kyun Oh,Min-Suk Kook 대한악안면성형재건외과학회 2023 Maxillofacial Plastic Reconstructive Surgery Vol.45 No.-
Background Mandibular condyle remodeling and displacement are post-orthognathic surgery concerns that can potentially lead to occlusal issues after bilateral sagittal split ramus osteotomy. This retrospective study examined the relationship between condylar volume changes and position alterations after surgery in patients with skeletal class II and III malocclusions using cone-beam CT. Methods The study included 16 patients (6 with Class II malocclusion, 10 with Class III malocclusion) who underwent bilateral sagittal split ramus osteotomy at Chonnam National University Hospital. Cone-beam CT data were collected at three specific time points: before surgery, immediately after surgery, and approximately 6 months post-surgery. Mandibular movement was measured using InVivoDental 5.4.6. ITK-SNAP 3.8.0 was used to assessed condylar volume changes post-surgery. Condyle positions were evaluated in four parts with RadiAnt DICOM Viewer 4.6.9. Statistical analyses were performed using the SPSS version 23. Results Considering both Class II and III malocclusion, a 2.91% volume reduction was noted immediately and at 6 months after surgery. Both Class II and III cases demonstrated a decrease in superior joint space by -0.59 mm and medial joint space by -1.09 mm. No significant correlation was found between this process and condylar volume change. Conclusions The mandibular condyle volume decreased, and superior-medial movement of the condyle was detected in patients with Class II and III malocclusion immediately and at 6 months after surgery with no volumeposition correlation.
김철영 ( Chulyoung Kim ),윤찬식 ( Chansik Yoon ) 연세대학교 경제연구소 2019 延世經濟硏究 Vol.26 No.1
적대 편향이란 소송 당사자들이 자신의 소송을 진행시키기 위한 전문가를 보유함으로써 발생하는 증언에서의 편향을 말한다. 우리는 그러한 적대 편향의 정도가 소송 과정에서 내생적으로 결정되는 간단한 분석틀을 제공한다. 본 모형을 통해, 우리는 국선 전문가를 사용하는 것이 적대 편향의 정도 및 평균적인 오류율에 미치는 영향을 분석하고, 흥미로운 트레이드오프 관계를 발견한다: 국선 전문가에게 자문을 구함으로써 판사는 재판에서의 실수의 수를 줄일 수는 있지만, 소송 당사자들은 그에 대한 반응으로서 편향된 전문가를 더욱 빈번하게 고용하기를 선택하며, 이것은 적대 편향의 정도를 증가시키고, 따라서 증거 왜곡을 더욱 빈번히 발생시킨다. Adversarial bias is witness bias that arises because litigants retain experts to advance their causes. We provide a simple framework where the level of adversarial bias is endogenously determined in a litigation process. Using this model, we study the effect of using a court-appointed expert on the level of adversarial bias and the average error rates, and find an interesting trade-off: although the judge can reduce the number of mistakes at trial by consulting a court-appointed expert, litigants choose to hire biased experts more frequently in response, which increases the level of adversarial bias, thereby inducing evidence distortion more often.
Study of Character Animation to improve Production Efficiency
Choi, Chulyoung The Institute of Internet 2020 International journal of advanced smart convergenc Vol.9 No.2
Recently, webtoons-based animations have been expanding in Korea, where the role of mobile devices is growing, and media videos such as "YouTube" and "Tik-Tok," which have shorter screening and production cycles than traditional feature films, dramas, and animations, are attracting attention and being enjoyed by public. In order to produce animation content that fits the trend of this shortening video and production cycle, efficiency must be increased not only in story but also in production. Production methods and production technologies need changes to increase efficiency. Animation using motion capture, which is highly production-efficient, is widely used in movies that shows realistic movements, but still has little use in producing cartoon-style animations with exaggerated movements. We analyzed the production method of 2D animation and CG animation and applied the result to CG animation to increase the efficiency of production and production. The methods of production through such experiments are expected to help improve the efficiency of producing animation content that is suitable for the latest trends such as webtoon animation.