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강석일(Seok-Il Kang),이태억(Tae-Eog Lee),이창조(Chang-Jo Lee) 한국엔터테인먼트산업학회 2017 한국엔터테인먼트산업학회논문지 Vol.11 No.1
LVC (Live-Virtual-Constructive) 연동에 대한 주제는 간단하지 않으면서 많은 인력과 비용, 시간을 투자하여 만들어진다. 이와 더불어 훈련이라는 추가 요소가 발생하며, 훈련의 목적에서 중요한 항목 중 하나로 군 또는 군인의 숙련도가 있다. 이러한 숙련도를 올리기 위하여 다양한 방법이 있지만 본 연구에서는 HMD(Head Mounted Display)라고 하는 VR(Virtual Reality) 디바이스를 L-V-C 모델 중 가상 탱크에 UDP/IP기반의 XML 통신으로 연동하여 몰입도 증대를 목적으로 두었다. 가상 탱크는 사용자의 입력을 바탕으로 기동을 하며 이 정보는 VR 탱크 시스템으로 실시간 전송되고 이에 따라 자연스러운 움직임으로 몰입도의 증대를 기하고자 하였다. VR 또는 AR, MR 등은 정보의 입체적 전시(Display)를 수행하며 사용자 또는 운영자가 더 효과적인 정보를 받을 수 있도록 하고, 이를 국방 M&S와 접목하면 더욱 훌륭한 시스템이 만들어질 것으로 기대한다. The theme of Live-Virtual-Constructive (LVC) interoperation is not simple but is made by investing a lot of manpower, cost and time. In addition, there is an additional element of training, and military or military skills are one of the most important items for the purpose of training. There are many ways to increase this proficiency but in this study, the aim was to increase the immersion of virtual tank which is L-V-C model with VR (Virtual Reality) device called HMD (Head Mounted Display) by UDP/IP based XML communication is linked to. The virtual tank is operated based on the input of the user, and this information is transmitted in real time to the VR tank simulator. Therefore, we intend to increase the immersion level by natural movement. VR, AR, MR, etc. perform a three-dimensional display of information and allow the user or operator to receive more effective information, and thus we expect that a better system will be created by combining this with Defense M & S.
초정밀 듀얼 스테이지를 위한 고댐핑 저진동 제어기 개발
강석일(Seok Il Kang),김정한(Jung-Han Kim) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.1
In this study, a cross-damped low vibration controller was developed to reduce vibration in ultra-precision dual stage driven by master/slave principle. In master-slave structure, the master stage leads the driving motion and the slave stage follows it so as to maintain a constant gap between two stages. In this structure, a small perturbation of master stage makes big oscillations in slave servoing stage, so a low damped master stage composed of voice coil motor makes a long vibration in settling area after driving motion profile. In this research, an effective feedback damping algorithm for increase the damping characteristics of the dual stage was developed. The designed velocity damping algorithm improves the system stability and reduces the settling time of the whole system. Simulation and experimental results show that the developed algorithm reduces settling time and improves the regulating performance.
강상일(Sang Il Kang),김석진(Seok Chin Kim) 한국무역연구원 2015 무역연구 Vol.11 No.4
This paper analyzes the impact of real won/yuan exchange rate changes and its volatility on Korean foreign direct investment (FDI) in China. We estimate the volatility by the GARCH (1,1) model. For the analysis, we employ the vector error correction model (VECM) from using data 1999 to 2013. Main results are as follows. First, the appreciation of RMB is negatively related with the Korean FDI in China. This result indicates that wage and/or wealth effects matter when the value of host currency changes. Second, the volatility of real won/yuan exchange rate is positively related with the Korean FDI in China. This result confirms the export substitution effect that FDI is preferred because export may get riskier than FDI. Third, these effects appear to be strong in some industries such as manufacturing, construction, wholesale and retail, accommodation and food, while they do not appear in other industries such as finance and insurance, real estate and leasing, and so on.
직접알고리즘 역해석 기법을 이용한 굴착단계별 흙막이 가시설 변위 및 축력의 적정성 평가
강소라,전제석,이영진,이준석,이강일,So-Ra Kang,Je-Seok Jeon,Yeong-Jin Lee,Jun-Seok Lee,Kang-Il Lee 한국지반신소재학회 2024 한국지반신소재학회 논문집 Vol.23 No.1
In this study, direct algorithm-based back analysis was utilized to perform back analysis on two actual earth retaining wall fields, which was then compared with genetic algorithm-based method to evaluate the suitability of the back analysis. Additionally, in order to propose effective utilization methods of the program, the measurement data, as the input for the back analysis, was varied for each excavation step, and the applicability of the back analysis results(displacement, axial force) was examined. The research findings indicate that both direct algorithm and genetic algorithm show high applicability; however, the optimization for this program is better predicted by the direct algorithm. Moreover, in order to effectively use the back analysis program employing the direct algorithm, it was evaluated that relatively accurate prediction of the earth retaining wall behavior could be achieved by inputting measurement data from the 7th excavation step for fields with final excavation steps ranging from 8 to 11.