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Far-field control of focusing plasmonic waves through disordered nanoholes.
Seo, Eunsung,Ahn, Joonmo,Choi, Wonjun,Lee, Hakjoon,Jhon, Young Min,Lee, Sanghoon,Choi, Wonshik Optical Society of America 2014 Optics letters Vol.39 No.20
<P>Control of near-field waves is the key to going beyond the diffraction limit in imaging and manipulating target objects. Here we present the focusing of plasmonic waves, a type of near-field waves, by the wavefront shaping of far-field waves. We coupled far-field waves to a random array of holes on a thin gold film to generate speckled plasmonic waves. By controlling the phase pattern of the incident waves with the wavelength of 637 nm, we demonstrated the focusing of plasmonic waves down to 170 nm at arbitrary positions. Our study shows the possibility of using disordered nanoholes as a plasmonic lens with high flexibility in the far-field control.</P>
Development of A Power Conditioning System for A 100kW MCFC Generation System
Hongju Jung,Hyoungnam Kwon,Joonmo Chung,Inyoung Suh,HeeCheon Lim,KyoSang Ahn 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper presents the development and testing of a power conditioning system (PCS) for application to a 100kW Molten Carbonate Fuel Cell (MCFC) generation system. The MCFC generation system is a part of a four year government funded research project that began in 2001. This paper presents the results of various tests and performance verification of the 100kW PCS using a DC power system that simulates the DC output of the MCFC fuel cell. Performance of the DC/DC, DC/AC converters were verified, and basic<br/> control functions such as grid connection, protection and characteristics of each component were tested. The tests were<br/> performed under light load and rated load conditions to verify the operation efficiency, power quality effects, and stability of the PCS.
행정 부처 및 신산업 간 네트워크 분석: 규제 샌드박스를 중심으로
정지은(Jieun Jung),안준모(Joonmo Ahn) 한국규제학회 2022 규제연구 Vol.31 No.1
본 연구는 4차 산업시대를 맞이하여 기술 간 융·복합이 가속화되고 있는 현실을 반영하여 우리나라의 행정 부처 간의 규제 네트워크를 살펴보았다. 전통적인 규제와 제도는 빠르게 변화하는 현대의 기술 혁신을 반영하기에 한계가 있다. 따라서 주요국은 새로운 규제 패러다임을 도입하고 있으며, 그 중 하나로 다수의 나라는 “규제 샌드박스”를 신산업 분야에 적용하고 있다. 우리나라도 문재인 정부 이후 “규제 샌드박스”를 적극적으로 도입하여 시행하고 있다. 그러나 하나의 행정 부처에서 다양한 산업의 규제를 관리하고 있어서 규제 샌드박스를 효율적으로 운영하기 위해서는 범부처 간 협업이 중요한 과제가 되었다. 따라서 각 부처가 신산업·신기술 분야의 어떤 산업의 규제를 담당하고 있으며, 어떤 부처와 서로 긴밀하게 연결되어 있는지 파악하는 것은 중요하다. 이에 본 연구는 이원 모드 네트워크 분석을 통해 규제 샌드박스를 시행하는 3개 부처(과학기술정보통신부산업통상자원부·중소벤처기업부)를 중심으로 각 행정 부처와 신산업 및 신기술 분야의 규제 네트워크를 살펴보았다. 규제 샌드박스 네트워크 중심성 지표 분석 결과 ‘산업통상 자원부’가 연결 중심성, 근접 중심성, 매개 중심성이 가장 높은 부처로 나타났으며, 산업의 경우 ‘블록체인’이 가장 많은 부처의 협업이 필요한 산업으로 나타났다. This study examined the regulatory network between administrative ministries in Korea. Traditional regulations have limitations in reflecting rapidly changing modern technological innovations. Therefore, major countries are introducing a new regulatory paradigm, Regulatory Sandbox, into the new industry sector. Korea has also introduced a Regulatory sandbox. However it is difficult to efficiently operate because one ministry manages the regulations of various industries. So, ministry collaboration is more important than ever. Therefore, it is important to know what ministry manages new industry regulations and which ministries are closely connected to each other. This study examined the regulatory networks in new industries and new technology fields through dual-mode network analysis.
ODAR: Aerial Manipulation Platform Enabling Omnidirectional Wrench Generation
Park, Sangyul,Lee, Jeongseob,Ahn, Joonmo,Kim, Myungsin,Her, Jongbeom,Yang, Gi-Hun,Lee, Dongjun IEEE 2018 IEEE/ASME transactions on mechatronics Vol.23 No.4
<P>We propose a novel aerial manipulation platform, an omnidirectional aerial robot, that is capable of omnidirectional wrench generation with opportunistically distributed/aligned Sectional rotors. To circumvent the tight thrust margin and weight budget of currently available rotor and battery technologies, we propose a novel design optimization framework, which maximizes the minimum-guaranteed control force/torque for any attitude while incorporating such important and useful aspects as interrotor aerointerference, anisotropic task requirement, gravity compensation, etc. We also provide a closed-form solution of infinity-norm optimal control allocation to avoid rotor saturation with the tight thrust margin. Further, we elaborate the notion of electronic speed controller induced singularity and devise a novel selective mapping algorithm to substantially subdue its destabilizing effect. Experiments are performed to validate the theory, which demonstrate such capabilities not possible with typical aerial manipulation systems, namely, separate translation and attitude control on SE(3), hybrid pose/wrench control with downward force of 60 N much larger than its own weight (2.6 kg), and peg-in-hole teleoperation with a radial tolerance of 0.5 mm.</P>