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Generating a Ball Sport Scene in a Virtual Environment
( Jongin Choi ),( Sookyun Kim ),( Sunjeong Kim ),( Shinjin Kang ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.11
In sports video games, especially ball games, motion capture techniques are used to reproduce the ball-driven performances. The amount of motion data needed to create different situations in which athletes exchange balls is bound to increase exponentially with resolution. This paper proposes how avatars in virtual worlds can not only imitate professional athletes in ball games, but also create and edit their actions effectively. First, various ball-handling movements are recorded using motion sensors. We do not really have to control an actual ball; imitating the motions is enough. Next, motion is created by specifying what to pass the ball through, and then making motion to handle the ball in front of the motion sensor. The ball's occupant then passes the ball to the user-specified target through a motion that imitates the user’s, and the process is repeated. The method proposed can be used as a convenient user interface for motion based games for players who handle balls.
Robust optimization of a tandem grating solar thermal absorber
Choi, Jongin,Kim, Mingeon,Kang, Kyeonghwan,Lee, Ikjin,Lee, Bong Jae Elsevier 2018 Journal of quantitative spectroscopy & radiative t Vol.209 No.-
<P><B>Abstract</B></P> <P>Ideal solar thermal absorbers need to have a high value of the spectral absorptance in the broad solar spectrum to utilize the solar radiation effectively. Majority of recent studies about solar thermal absorbers focus on achieving nearly perfect absorption using nanostructures, whose characteristic dimension is smaller than the wavelength of sunlight. However, precise fabrication of such nanostructures is not easy in reality; that is, unavoidable errors always occur to some extent in the dimension of fabricated nanostructures, causing an undesirable deviation of the absorption performance between the designed structure and the actually fabricated one. In order to minimize the variation in the solar absorptance due to the fabrication error, the robust optimization can be performed during the design process. However, the optimization of solar thermal absorber considering all design variables often requires tremendous computational costs to find an optimum combination of design variables with the robustness as well as the high performance. To achieve this goal, we apply the robust optimization using the Kriging method and the genetic algorithm for designing a tandem grating solar absorber. By constructing a surrogate model through the Kriging method, computational cost can be substantially reduced because exact calculation of the performance for every combination of variables is not necessary. Using the surrogate model and the genetic algorithm, we successfully design an effective solar thermal absorber exhibiting a low-level of performance degradation due to the fabrication uncertainty of design variables.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Robust optimization of a tandem grating solar thermal absorber considering unavoidable fabrication uncertainties in the design variables has been proposed. </LI> <LI> Detailed parametric study was also performed to investigate the effect of each design variable on the performance of the solar absorber. </LI> <LI> Using the surrogate model and the genetic algorithm, we successfully designed the robust optimum that exhibits the solar absorptance greater than 0.92 with 90% probability. </LI> </UL> </P>
연구개발팀의 혁신성과에 대한 팀장의 윤리적 리더십의 비선형적 관계 및 팀 존속기간의 조절역할
최종인(Choi, Jongin),김학수(Kim, Hacksoo) 한국인사관리학회 2015 조직과 인사관리연구 Vol.39 No.4
기업 윤리의 중요성이 강조되면서 윤리는 리더와 부하직원들 간의 관계에서 핵심적 요인이며, 윤리적 리더십은 기업의 경쟁력 제고를 위한 경영관리 방식이다. 하지만 윤리와 창의성은 상충관계에 놓여 있고, 혁신이 중요한 연구개발팀에서 지나친 윤리의 강조는 혁신을 방해할 수 있다. 본연구는 낮거나 높은 수준보다 적정한 수준에서 연구개발팀장의 윤리적 리더십이 팀 혁신성과를 향상시킬 것으로 보았다. 왜냐하면 윤리는 순응성을 강조하는 반면, 창의성은 확산성을 강조하기 때문이다. 리더십의 효과는 팀 수명주기에 따라 다를 수 있다고 보고, 본 연구는 팀 초기에 팀장의 윤리적 리더십이 효과적일 수 있다고 보았다. 본 연구는 52개 연구개발팀의 상급자인 임원들 및 235명의 연구개발 인력들로부터 수집된 자료를 토대로, 팀장의 윤리적 리더십이 팀 혁신성과에 미치는 영향 및 팀 존속기간의 조절역할을 실증 분석하였다. 분석결과에 의하면, 팀장의 윤리적 리더십은 팀 혁신성과에 역 U형태의 비선형적 영향을 주는 것으로 나타났다. 팀 존속기간이 짧을수록 팀장의 윤리적 리더십과 팀 혁신성과간의 역 U형태의 관계가 명확하게 나타났고, 팀 존속기간이 길수록 팀장의 윤리적 리더십과 팀혁신성과 간의 관계가 유의하지 않은 것으로 나타났다. 이 연구 결과를 토대로 연구의 시사점 및 향후 연구방향 등을 논의하였다. Under emphasizing of important in business ethics in Korea, ethics will be the most key factor among the relationship between leader and subordinates, and ethical leadership will be becoming an increasingly important factor in determining an organization’s competitive advantages. But, there will be trade off between ethics and creativity, emphasizing of highly ethics will be negatively affect on creative outcomes with a R&D team where innovative performance is relatively important. R&D team leaders who influence moderately ethical leadership will produce higher levels of team innovative performance than R&D team leaders who influence low or highly ethical leadership. Also, the effectiveness of team leadership depends on team’s life cycle, ethical leadership will be more effective during the initial stages of R&D team duration. This study investigates the effect of ethical leadership on team innovative performance, and moderating effect of team duration is examined. This study collects data from 52 executives of R&D teams and 235 team members. The results shows that ethical leadership of R&D team leader has inverted U-shape effects on team innovative performance, and team duration moderates the relationship between ethical leadership of R&D team leader and team innovative performance in that the relationship is stronger for teams working on short or medium durations than teams working on long durations. We discussed research implications and suggested future research directions.
초음속 환경에서 역분사 공기 제트의 압력 변화에 따른 유동 특성 및 항력 감소
최종인(Jongin Choi),이재청(Jaecheong Lee),강승원(Seungwon Kang),허환일(Hwanil Huh) 한국추진공학회 2018 한국추진공학회지 Vol.22 No.1
To improve the performance of high-speed vehicles, various studies have been carried out on the head of vehicles. In this study, tests are conducted on flow characteristics and drag reduction using counterflow air jets in supersonic flow. The flow is visualized by the Schlieren method using a high-speed camera, and the drag is measured using a torque sensor according to the injection pressure conditions. The results of the measurements indicate that the flow changes from unsteady state to steady state for injection pressure ratios between 1.58 and 1.70, and drag reduction is observed as the pressure of the counterflow air jets increases.
최준섭(Junsub Choi),문태석(Taeseok Moon),최종인(Jongin Choi),박상현(Sanghyeon Park),김한솔(Hansol Kim),허환일(Hwanil Huh) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.8
고도보정 노즐은 모든 고도에서 최적의 성능을 발휘할 수 있도록 고안된 노즐이다. 발사체의 비추력을 향상시키기 위한 방법으로는 연소실만의 특성인 특성배기속도를 향상시키는 방법과 노즐만의 특성인 추력계수를 향상시키는 방법이 있다. 고도보정 노즐은 동일한 연소기에서 노즐의 성능 개선을 통해 발사체의 성능향상을 가능하게 한다. 고도보정 노즐에 대한 연구는 독일 DLR에서 활발하게 진행되고 있으며, 미국, 러시아, 영국, 호주, 일본 등 항공우주선진국에서도 진행되고 있다. 본 논문에서는 고도보정 노즐에 대한 기술 현황 및 특허 동향에 대해 조사하였다. 이를 바탕으로 고도보정 노즐의 기술흐름을 파악하고 발사체 성능향상 연구에 기초자료로 활용하고자 한다. The altitude compensation nozzle is a nozzle designed for optimum performance at all altitudes. A method of improving the specific impulse of the space launch vehicle is a method of improving the characteristic exhaust velocity which is a characteristic of the combustion chamber and a method of improving the thrust coefficient which is a characteristic of the nozzle. The altitude compensation nozzle enables improvement of the performance of the space launch vehicle by improving the nozzle performance for the same combustor. Research on altitude compensation nozzles has been actively carried out in the DLR in Germany and is being carried out in advanced countries such as the US, Russia, UK, Australia and Japan. In this paper, the technology trends and patent trends of altitude compensation nozzles are investigated and summarized. Based on this, the technical trends of altitude compensation nozzles is grasped and utilized as basic data for the study on the performance improvement of a launch vehicle.