http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
최정진(Jeongjin Choi),한민구(Mingu Han),임선우(Sunwoo Lim),이정기(Jungki Lee) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
In this paper, the three-dimensional volume integral equation method (VIEM) is introduced for the analysis of an unbounded isotropic solid containing single isotropic/anisotropic spheroidal inclusions. A comprehensive analysis of three-dimensional elastostatic volume integral equation method (VIEM) is introduced for the analysis of an unbounded isotropic solid containing single isotropic/anisotropic spheroidal inclusions. In order to verify the three-dimensional volume integral equation method (VIEM) solutions, the VIEM solutions were compared to the exact solutions based on the Eshelby solution that evaluates the elastic fields inside and outside of an ellipsoidal inclusions for single isotropic/anisotropic spheroidal inclusions of arbitrary shape.
최정진 ( Jeongjin Choi ) 사단법인 아시아문화학술원 2021 인문사회 21 Vol.12 No.6
본 연구의 목적은 21세기에 들어서면서 경제발전을 바탕으로 세계 패권국으로 입지를 다지고 있는 중국의 당내 민주주의가 지닌 의미를 살펴보는데 있다. 중국 권력은 인민에게 있다고 천명한 사회주의 헌법에 명확히 명시되어 있기는 하나, 실질적 권력의 원천은 공산당에 있는 이중적 구조 가운데 당내 민주주의에 초점을 맞춰 국내문헌 중심으로 그 안에 담고 있는 함축적인 의미들을 분석하였다. 분석결과, 현 단계 중국이 국내외적 많은 도전들에 직면하고 있는 문제점들을 해결하기 위해서라도 공산당으로서 당내 민주주의는 당의 제도 안에서 부분적이며 점진적인 변화를 가져올 것으로 전망된다. 따라서 중국 공산당의 절대적 지지를 받고 있는 시진핑(习近平)의 강력한 정치개혁과 발전 및 사회적 안정을 추구하는 정책은 확대 유지될 것이다. 그러므로 중국 공산당은 창당 100년을 넘어 계속된 변화 속에서 향후 공산당 100년의 새 역사를 거듭할 것으로 보인다. The purpose of this study is to examine the meaning of democracy in China’s party, which has established itself as a world hegemony based on economic development in the 21st century. Although it is clearly stated in the socialist constitution that declared that Chinese power belongs to the people, the actual source of power was analyzed by focusing on democracy within the party among the dual structures of the Communist Party. As a result of the analysis, democracy within the party as a Communist Party is expected to bring about partial and gradual changes within the party’s system, even to solve the problems facing many domestic and international challenges at this stage. Therefore, Xi Jinping’s policy of pursuing strong political reform, development, and social stability, which is absolutely supported by the Chinese Communist Party, will be expanded and maintained. Therefore, the Chinese Communist Party is expected to repeat a new history of 100 years in the future amid continuous changes beyond 100 years of its founding.
최정진(Jeongjin Choi),한민구(Mingu Han),임선우(Sunwoo Lim),이정기(Jungki Lee) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
In this paper, the three-dimensional volume integral equation method (VIEM) is introduced for the analysis of an unbounded isotropic solid containing single isotropic/anisotropic spheroidal inclusions. A comprehensive analysis of three-dimensional elastostatic volume integral equation method (VIEM) is introduced for the analysis of an unbounded isotropic solid containing single isotropic/anisotropic spheroidal inclusions. In order to verify the three-dimensional volume integral equation method (VIEM) solutions, the VIEM solutions were compared to the exact solutions based on the Eshelby solution that evaluates the elastic fields inside and outside of an ellipsoidal inclusions for single isotropic/anisotropic spheroidal inclusions of arbitrary shape.
여정진(Jeongjin Yeo),임윤호(Yoonho Lim),조종현(Jonghyun Jo),최영재(Youngjae Choi),박혜정(Hyejeong Park),유문호(Munho Ryu),양윤석(Yoonseok Yang) 한국HCI학회 2013 한국HCI학회 학술대회 Vol.2013 No.1
본 연구에서는 에너지수확 기술을 이용하여 인체의 운동 에너지를 전기에너지로 변환하고 공급하는 동시에 이를 이용하여 사용자에게 햅틱 피드백을 제공할 수 있는 인터페이스 기술을 개발하였다. 개발된 에너지 수확기는 내부에 움직이는 자석과 외부에 감겨진 코일을 포함하며, 쉽게 손에 쥘 수 있는 간단한 도넛 형태로 제작되었다. 전자기 유도 방식의 에너지 수확기는 사용자가 흔들 때 전력을 생성하여 저장하는 역할과 함께, 역으로 코일에 전류를 인가하면 자석의 움직임을 통해 햅틱 피드백을 발생시키도록 설계되었다. 실험을 통해 에너지 생성과 외부 전원에 의한 진동 피드백 성능을 입증하였으며, 향후 수확된 에너지만을 사용해 구동이 가능한 햅틱 피드백을 구현할 계획이며, 개발된 장치는 게임과 스포츠 등 다양한 분야에 활용 될 수 있을 것으로 기대된다. We developed a novel interface technology adopting an energy harvester which not only converts the human kinetic energy into the electrical energy but also provides a haptic feedback to user. An electromagnetic energy harvester in the device has moving magnets and coils which are coupled longitudinally in a doughnut shaped frame. The device is designed and implemented to generate electric power when a user shakes it, and to give haptic feedback to the user by driving vibration components. We verified the operation of the harvester and vibrator driven by external current through the experiments. The vibrating feedback will be supplied by self-generated electric power through further improvement in energy conversion. We expect that it will be useful in various application such as sports and games.
A 0.018% THD+N, 88-dB PSRR PWM Class-D Amplifier for Direct Battery Hookup
Youngkil Choi,Wonho Tak,Younghyun Yoon,Jeongjin Roh,Sunwoo Kwon,Jinseok Koh IEEE 2012 IEEE journal of solid-state circuits Vol.47 No.2
<P>A low-distortion third-order class-D amplifier that is fully integrated into a 0.18-μ m CMOS process was designed for direct battery hookup in a mobile application. A class-D amplifier for direct battery hookup must have a sufficiently high power supply rejection ratio (PSRR) in preparation for noise, such as when a global system for mobile communications (GSM) bursts ripples through the system power line. This amplifier has a high PSRR of 88 dB for 217-Hz power supply ripples, using a third-order loop filter. System performance and stability are improved by applying the design technique of input-feedforward delta-sigma (ΔΣ) modulators to the pulse-width modulation (PWM) class-D amplifier. A filterless method that can remove the external LC filter is employed, which offers great advantages in terms of PCB space and system cost. This amplifier achieves a power efficiency of 85.5% while delivering an output power of 750 mW into an 8-Ω load from a 3.7-V supply voltage. Maximum achieved output power at 1% total harmonic distortion plus noise (THD+N) from a 4.9-V supply voltage into an 8-Ω load is 1.15 W. This class-D amplifier is designed to have a broad operational range of 2.7-4.9 V for the direct use of mobile phone battery power. It has a total area of 1.01 mm<SUP>2</SUP> and achieves a THD+N of 0.018%.</P>