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래디얼 동전기 휠을 이용한 전도성 트랙 위에서의 이송 시스템
정광석(Kwang Suk Jung) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.11
전도성 평판의 모서리에 래디얼 동전기 휠을 부분적으로 중첩시켜 회전시키면 휠에는 부상력과 모서리 방향의 추력 그리고 중첩 영역을 감소시키는 방향으로의 횡력이 발생한다. 이러한 휠을 조합하면 진행 방향을 제외한 나머지 축에서의 자기 안정성이 담보되는 시스템 구현이 가능하다. 실증차원에서 래디얼 동전기 휠을 이용한 자기 부상 방식 이송 시스템을 제안한다. 시스템은 네 개의 동전기 휠에 의해 부상, 추진되며 앞뒤 휠에 의한 추력이 서로 상쇄되도록 대항하는 구조로 배치되어있다. 휠의 동적 안정성과 동전기력에 미치는 휠 극수의 영향이 유한요소법을 이용하여 분석된다. 단동 휠에 의한 추력과 부상력은 강하게 연성되어있고 이를 가변시킬 수 있는 인자는 휠의 회전속도뿐이다. 따라서 두 힘을 독립적으로 제어하기 위해 추력과 부상력간의 비율이 속도에 비례하고 공극의 크기와 무관하다는 사실을 이용한다. 이러한 제어 방법으로 시스템의 면내, 면외 운동 제어를 수행하고 이를 시뮬레이션 결과와 비교하였다. 실험 결과는 휠의 속도만으로 연성된 자유도를 효과적으로 제어할 수 있음을 보여준다. When a radial wheel is placed so as to partially overlap a conductive plate and rotated, a lift force is generated on the wheel, a thrust force along the edge, and a lateral force which tends to reduce the overlap region. When several of these wheels are combined, it is possible to realize a system in which the stability of the remaining axes is ensured, except in the traveling direction. To validate the overall characteristics of the multi-wheel system, we propose a transfer system levitated magnetically using radial electrodynamic wheels. The proposed system is floated and propelled by four wheels and arranged in a structure that allows the thrusts generated by the front and rear wheels to offset each other. The dynamic stability of the wheel and the effect of the pole number on the three-axial forces are analyzed by the finite element method. At this time, the thrust and levitation force are strongly coupled, and the only factor affecting them is the wheel rotation speed. Therefore, in order to control these two forces independently, we make use of the fact that the ratio of the thrust to the levitation force is proportional to the velocity and is independent of the size of the gap. The in-plane and out-of-plane motion control of the system is achieved by this control method and compared with the simulation results. The experimental results show that the coupled degrees of freedom can be effectively controlled by the wheel speed alone.
세계 정상급 태권도 선수들의 경기 운영형태에 따른 득점 유형분석
정광채(Jung, Kwang-Che),양대승(Yang, Dae-Seung) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.5
The purpose of this study was to analyze the scoring patterns of world-class taekwondo players according to their game Tactics styles. To be specific, this study utilized 345 matches of G.P Competition 2015 for notational analysis and selected rotation, offensive situation, offensive pattern and kicking tactics as factors of analysis. For the purpose of this study, it classified game Tactics styles as ‘Dominating Center Court Style’, ‘Playing in Center Court Style’ or ‘Playing around Court Boundary Style’(Jung et al, 2010). The study quantified the data regarding several factors during the match and game Scoring Patterns of Game Tactics in World-class Taekwondo Players styles by using Dartfish program, which is a video analysis tool. In addition, it used SPSS 19.0 to analyze scoring patterns according to game Tactics styles. Frequency, percentage and chi-square examination was executed and alpha level was set to 0.5. The results of this study are as follows. First, in both male and female taekwondo matches, if the player mainly plays in the center court, he or she shows higher scoring patterns. Second, when a male player is leading the game and dominates the center court, he showed higher scoring patterns while female player showed the same results by mainly playing in the court boundary. Third, both male and female players showed higher scoring patterns by striking first while dominating the center court. Fourth, while dominating the center court, both male and female players showed the highest scoring patterns with turning kick followed by pushing kick and turning kick to the head.
정광식(Kwang-Sik Jung),이종학(Jong-Hak Lee),김영완(Young-Wan Kim),라영은(Young-Eun Ra),전정익(Jung-Ik Jeon) 한국전기전자학회 2020 전기전자학회논문지 Vol.24 No.2
본 논문에서는 함정의 합내통신, 함외통신, 방송, 전화 등의 통합통신 안테나 중 함외통신용 UHF 대역 통합통신 안테나를 통합마스트에 탑재 가능한 평면형으로 설계했다. 제안된 통합마스트 탑재용 안테나는 해군의 한국형차기구축함(KDDX)에 적용되는 통합통신용 안테나로 작전능력, 생존성 강화와 운용성과 정비성의 향상 등 ‘복합경사’ 구조를 포함하는 최적화된 형태의 통합통신용 안테나이다. 기존 회전식 레이더와 다수의 모노폴 형태의 통신용 안테나를 마스트 외관에 불규칙한 형태로 부착된 형태에서 평판형 통합통신용 안테나를 포함하는 통합 마스트 형상으로 변경하여 레이더 반사 면적 지수(RCS)를 크게 낮추며 해외제품 대비 고이득 광대역 안테나를 개발목표로 한다. This paper, UHF band integrated communication antenna for ship communication is designed as a flat type that can be mounted on the integrated mast among integrated communication antennas such as integrated communication, ship communication, broadcasting, and telephone of the ship. The unified mast mounted antenna is an integrated communication antenna applied to the Navy’s KDDX, which is an optimized type of integrated communication antenna including a ‘composite slope’ structure including operational capability, survivability, and improved operability and maintainability. The existing rotary radar and a plurality of monopole-type communication antennas were changed from an irregularly attached shape to the mast exterior to an integrated mast shape including a flat-type integrated communication antenna. the radar reflection area index (RCS) is significantly lowered and compared to overseas products. The goal is to develop a gain broadband antenna.
정광석(Kwang-Seok Jung),김선재(Sun-Jae Kim),박대원(Dae-Won Park),길경석(Gyung-Suk Kil),서동환(Dong-Hoan Seo) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
In this paper, we analyzed the frequency spectrum of radiated electromagnetic waves which is generated by series arc and corona discharges as a basic study to develop a online diagnostic technique for power facilities installed in a closed-switchboard. To simulate corona and series arc discharges, an arc generator specified in UL1699 and a corona generator were fabricated. The experiment was carried out in an electromagnetic shielding room, and the measurement system consists of a Ultra Log Antenna and a EMI Test Receiver. These results showed that the frequency spectrum of series arc and corona discharges exists in ranges from 30 to 500 [㎒], and the peak frequency of them were 40 [㎒], 80 [㎒], and 400 [㎒].
정광석(Kwang-Suk Jung) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.7
When a conductive rod is put within rotating axial magnet wheels arranged parallel, three-axial magnetic forces generate on the rod. In some region, the forces has a property of negative stiffness, thus they can be applied to noncontact conveyance of the rod without a control load. Apart from the passive driving, the magnet wheel should be controlled for the rod to be stayed at the still state or be moved in a specified velocity. But, because a control input is just the rotating speed of the magnet wheel, the number of input is less than that of variables to be controlled. It means that levitation force and thrust force increase at the same time for increasing wheel speed, resulting from a strong couple between two forces. Thus, in this paper, a novel method, in which the longitudinal motion of the rod is controlled indirectly by the normal motion of the rod with respect to the wheel center, is introduced to manipulate the rod without mechanical contact on space.