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Analysis of surface plasmon polariton conversion coefficient in slit-groove structure
Park Yeonsang 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.9
A method for the analysis of finding the conversion efficiency of the surface plasmon polariton in slit-groove structures is proposed and studied. The conversion efficiency of the surface plasmon polariton can be determined by measuring the intensities of light scattered at the slit and groove positions. To verify the usefulness of the proposed method, two rigorous simulations based on the finite-difference time-domain method were executed and the simulation results compared with previously reported data. One was to mimic the far-field imaging experiment in slit-groove structure and the other was to calculate the conversion coefficient directly in a single scattering structure. The SPP conversion efficiencies obtained from the two simulations were approximately 0.232 and 0.220 respectively, and these agreed with the reported data. The suggested method can be used regardless of the shape of the plasmon-generation structure; therefore, it is expected to be useful in a wide range of experiments with different scattering structures.
우리나라 서해에서 활동 중인 중국 해상민병대의 불법침략 조업 실태와 대책에 관한 연구
노연상(YeonSang Roh) 서울사이버대학교 미래사회전략연구소 2021 미래사회 Vol.12 No.2
중국은 어민으로 위장한 75만명의 해상민병대를 운용하고 있다. 이들은 우리나라 이어도와 격렬비열도 및 서해 5도가 위치한 북방한계선 NLL 해역에서 마구잡이 불법 침략조업을 주도하고 떼로 몰려다니면서 우리 해양경찰의 단속에 폭력으로 대항하고 있다. 그러나 우리정부의 적절하고 마땅한 조치는 별로 보이지 않는다. 지금까지 중국어선 불법조업에 관한 논문은 주로 해양경찰청 경찰백서와 우리나라 단속법규 및 단속방법, 해양경찰의 열악한 환경 등에 기초한 자료에 따라 문제점을 논의하는데 그쳐, 중국 불법침략조업의 근본인 해상민병대의 특징과 해상민병대의 불법침략조업 수법을 분석하는데 미흡하며 중국 해상민병대의 불법침략조업에 대한 효과적인 대책을 제시하지 못했다. 따라서 이번 연구는 우리 서해에서 불법침략조업을 주도하는 중국 해상민병대의 개념과 운영근거, 현황을 먼저 살펴보고 중국 해상민병대의 특징과 불법침략조업의 수법을 분석하여 중국 해상민병대의 불법침략조업에 대한 효과적인 대책을 제시하였다. 미국과 중국 간의 패권경쟁과 역내 국가 간 안보갈등이 동시에 나타나는 회색지대 해양분쟁의 무대인 우리나라의 서해에서 중국의 해상전략과 실행수단인 해상민병대의 활용과 그 효과에 대하여 살펴보고 중국 해상민병대의 다양한 불법침략조업 전술과 전략을 분석하는 것으로서 중국의 서해에 대한 해상전략을 이해하여 우리바다인 서해와 이어도 및 격렬비열도와 서해 5도가 위치한 NNL 해역을 수호할 수 있는 대응방법을 찾을 수 있을 뿐만 아니라 중국 해상민병대 불법침략조업의 근본적인 해결방안에 도움을 줄 것으로 생각한다. China operates 750,000 maritime militia troops disguised as fisherman. They are fighting against the Korean maritime police with violence by leading random illegal fishing and flocking in groups in the NLL waters of the Northern Limit Line, where Socotra Rock, the violent Gyeongnyeolbi-yeoldo, and the West Sea 5 are located. However, there are few appropriate and appropriate measures by our government. So far, papers on illegal Chinese ships have only discussed problems mainly based on the police white paper of the Maritime Police Agency, Korean crackdown laws and crackdown methods, and poor environment of the maritime police. It is insufficient to analyze the characteristics of maritime militia, which is the basis of illegal violence fishing in China, and methods of illegal violence fishing using maritime militia, and failed to present effective measures for illegal violence fishing using Chinese maritime militia. In addition, among the existing studies, marine disputes and gray areas in the South China Sea and case studies of Chinese maritime militia civilian forces were the only. Therefore, this study first examined the concept, operation basis, and current status of Chinese maritime militia leading illegal violence fishing operations in the West Sea. By analyzing the characteristics of Chinese maritime militia and methods of illegal violence fishing, effective measures for illegal violence fishing using Chinese maritime militia civilian forces were presented. The use and effect of China‘s maritime strategy and implementation means of maritime militia civilian forces in Korea‘s West Sea, a stage of maritime militia disputes between China and the United States and security conflicts between regional countries, were examined. Understand China‘s maritime militia strategy for the West Sea by analyzing the tactics and strategies of various illegal violence fishing operations using the Chinese Maritime militia Civil Corps. Not only can we find a countermeasure to protect the NNL waters where the West Sea Located, Socotra Rock and Gyeongnyeolbi-yeoldo but we also think it will help fundamental solutions to illegal violence fishing by Chinese maritime militia.
Optical slot antennas and their applications to photonic devices
Park, Yeonsang,Kim, Jineun,Roh, Young-Geun,Park, Q-Han De Gruyter 2018 Nanophotonics Vol.7 No.10
<P>We present optical slot antennas and their applications to photonic devices. We show that metallic nanoslots have the properties of a slot antenna by measuring the transmission spectra and far-field radiation patterns and then prove that they can be physically regarded as magnetic dipoles in the optical region. Additionally, we can generate directional radiations from optical slot antennas by adopting the geometry of radiofrequency Yagi-Uda antenna and properly adding auxiliary elements called reflectors and directors to a single slot antenna. We present two cases as the applications of optical slot antennas. One is the integration of slot antennas to plasmonic waveguides. This combination can be used as a basic unit for optical interconnection to free space and plasmonic via in multilayered plasmonic structures. The other is the integration of slot antennas to the electrode of light-emitting diodes (LEDs). Using slot antennas, we can control the polarization and direction of emissions from LEDs. Besides the above-mentioned two cases, we expect that optical slot antennas have possible applications to various photonic devices and can be essential elements in future integrated photonic circuits with nanometer scales.</P>
윤연상(Yeonsang Yun),류광현(Kwang-Hyun Ryoo),박진섭(Jinsub Park),김용대(Yongdae Kim),한선경(Seonkyoung Han),유영갑(Younggap You) 한국정보보호학회 2004 정보보호학회논문지 Vol.14 No.4
본 논문에서는 IPSec 가속기의 성능분석 모델을 제안한다. 제안된 성능분석은 큐잉 모델링을 기반으로 하고 트래픽로드는 포아송 분포를 채택하였다. 성능분석 시 새로운 파라미터로 디코딩지연을 정의하여 시뮬레이션에 이용하였다. 제안된 모델을 이용하여 IPSec 가속장치인 BCM5820의 성능을 분석한 결과, 장비를 통해 실측된 결과와 15% 정도의 차이만을 나타내었다. 제안된 모델을 이용한 성능분석 결과는 IPSec 가속기의 최대성능을 유지하기 위한 서버내의 하드웨어들의 적합한 구조를 제시하고 나아가 고속 네트워크 컴퓨터의 통계적 설계공간탐색에 이용될 수 있다. This paper proposes an IPSec accelerator performance analysis model based a queue model. It assumes Poisson distribution as its input traffic load. The decoding delay is employed as a performance analysis measure. Simulation results based on the proposed model show around 15% differences with respect to actual measurements on field traffic for the BCM5820 accelerator device. The performance analysis model provides with reasonable hardware structure of network servers, and can be used to span design spaces statistically.