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FSS 단위셀 배열구조에 따른 구형 주파수 선택 구조의 RCS 특성비교
홍익표,이인곤,Hong, Ic-Pyo,Lee, In-Gon 한국전기전자학회 2012 전기전자학회논문지 Vol.16 No.4
본 논문에서는 레이더 단면적(RCS, Radar Cross Section)을 감소시키기 위한 전자파 구조로서 십자형 다이폴 슬롯을 원소로 가지며 다른 배열형태 구조를 갖는 구형 주파수 선택적 표면(FSS, Frequency Selective Surface) 구조의 전파특성을 해석하였다. 유한크기와 곡면형상을 갖는 구형 주파수 선택적 표면 구조의 주파수 특성을 해석하기 위해 RWG 함수를 적용한 3차원 모멘트법을 사용하였으며 반복법 중 하나인 BiCGSTab(Biconjugate Gradient Stabilized) 알고리즘을 적용하여 해석시간의 효율성을 개선하였다. 1m 직경을 갖는 완전도체(PEC, Perfect electric conductor)의 구에 대한 이론적 해석결과인 Mie의 RCS 특성과 비교 검증하여 제안한 해석 알고리즘의 유효함을 입증하였다. 구형 주파수 선택적 표면 구조에서 슬롯 성분의 배열 방법에 따른 RCS 변화를 관찰하여 비교하였으며, 곡면형상의 주파수 선택구조 설계시 배열의 방법도 RCS 특성에 중요한 변수가 될 수 있음을 확인하였다. In this paper, we analyzed the electromagnetic characteristics of the spherical frequency selective surface with different arrangement of crossed dipole slot elements for reducing the RCS(radar cross section). The three dimensional MOM(method of moment) with RWG basis is used to analyze the proposed structure. To reduce the simulation time, we applied the BiCGSTab(Biconjugate Gradient Stabilized) algorithm as an iterative method and presented the comparison results with Mie's theoretical results for PEC sphere to show the validity of this paper. From the simulation results, the different arrangement of elements array showed the difference RCS that cannot be negligible. The arrangement method of element in frequency selective surface will be one of variables for the design of curved frequency selective structures.
Challenges and Opportunities for Occupational Therapy in Big Data Research
홍익표,Meredith F. Shields,Mi Jung Lee,Riqiea Kitchens,Karen Ratcliff,Timothy A. Reistetter,홍익표 대한작업치료학회 2019 대한작업치료학회지 Vol.27 No.4
The advance of information technology with governmental support allows researchers to utilize big data to conductrigorous rehabilitation-related studies in both the United States and Korea. While big data research has beenactively conducted in the United States, few Korean rehabilitation scientists currently conduct big data research. Inthis paper, we discuss the existing rehabilitation-related big data in Korea and introduce the current big dataresearch trends in the United States. In addition, we provide potential research areas by discussing the previousbig data studies in the United States, including 1) functional outcomes, 2) geographical variation, 3) linkage of apopulation-based cohort to hospital data, 4) cross-national comparison, and 5) scale development. We also discussvarious statistical methods required in big data research and compare how these methods differ compared to thetraditional research methods in rehabilitation research. Lastly, we discuss the importance of workforce developmentin rehabilitation-related big data research. We hope this paper will provide occupational therapy scientists andclinicians with practical and useful information about big data research and accelerate big data rehabilitationresearch communities in Korea.
도체두께를 가진 비대칭 결합선로를 이용한 정방향 -3㏈ 방향성 결합기의 설계 및 제작
홍익표,윤남일,육종관 한국통신학회 2003 韓國通信學會論文誌 Vol.28 No.8A
In this paper, forward-wave -3㏈ directional coupler with finite-thickness conductor and asymmetrical coupled lines are designed and experimentally verified using mode-matching based design methodology. Most of studies published in the literatures about the coupled lines are mainly concentrated on the adjustment of coupling amount by changing various geometric configurations. The analysis results in this paper show that thicker metalization requires reduced coupler length in the forward-wave directional coupler composed of asymmetrical coupled lines. Several forward-wave directional -3 ㏈ couplers with finite metalization thickness composed of asymmetrical coupled microstrip lines have been designed in the 5 ㎓ based on proposed design method. The measured data show -4.05㏈∼-4.09㏈ coupling at center frequency which is very closed to design value. The tight coupling has been implemented with accurate design methodology which take mentalization thickness into account. 본 논문에서는 모드정합법을 이용하여 도체두께를 고려한 비대칭 결합선로의 특성을 해석하고, 중심주파수 5㎓ 인 정방향 -3㏈ 방향성 결합기를 설계 및 제작하였다. 결합선로의 결합도에 대한 연구는 대부분 기하학적인 구조의 변화에 대해 연구되어 왔으나, 본 논문에서는 도체두께가 비대칭 결합선로의 간격, 선로 폭, 결합기의 길이에 미치는 영향을 이론적으로 분석하고, 도체두께를 고려한 비대칭 결합선로를 이용한 결합기를 설계하여 도체 두께가 두꺼울수록 강한 결합으로 인하여 정방향 결합기의 결합길이가 짧아지고 광대역 특성이 얻어지는 결과를 얻었다. 본 논문에서는 5㎓ 중심주파수로 한 도체두께가 서로 다른 비대칭 결합선로로 구성된 정방향 -3㏈ 결합기를 설계하고, 제작 및 실험을 통하여 약 -4.05㏈∼-4.09㏈의 결합특성을 갖는 주파수특성 측정결과를 얻어 설계 값에 거의 근접하는 것을 확인하였으며, 도체 두께를 고려한 정확한 설계로써 결합선로에서 강한결합과 광대역 특성을 만들 수 있다는 사실을 확인하였다.
남북한 사회통합의 새로운 지향: 합의제 민주주의를 중심으로
홍익표 평화문제연구소 2004 統一問題硏究 Vol.16 No.2
This article explores the question of social integration between South and North Korea in the context of consensual democracy. The two Koreas have industrialized rapidly while at the same time extending social and political cleavages and conflicts. Added to this the long duration of division has consolidated differences in the systems of the two Koreas regarding social values and norms. To prepare and carry forward the desirable social integration a democratic regime is needed that emphasizes consensus instead of opposition, includes rather than excludes, and tries to maximize the size of the ruling majority. Consensual democracy based on the principles of inclusion enables minorities to access to power, and therefore facilitates the complicated process of social integration between the two Koreas.
홍익표,채병윤,Hong, Ik-Pyo,Chae, Byeong-Yun 대한한방안이비인후피부과학회 1990 한방안이비인후피부과학회지 Vol.3 No.1
Aebaegeum has been widely used in the treatment of epistaxis, as based on Oriental Medical 1iteratures. In order to investigate experimentally the clinical effects of Aebaegeum, hemostatic time, plasma recalcification time and prothrombin time of hypoprothrombinemia induced by warfarin injection, action on isolated ileum, action on blood vessel, action on blood pressure and respiration and action on heart were observed. The result of the studies were obtained as follows: 1. Hemostatic time of vein ruptured mice was significantly shortened. 2. Plasma recalification time and prothrombin time of hypoprothrombinemic rats induced by warfarin injection were significantly shortened. 3. Spontaneous mobilities in the isolated ileum of mice were significantly suppressed, and contraction by acetylcholine chloride and barium chloride were inhibited. 4. Dilatation of blood vessel and downing of blood pressure of rabbit were noted. 5. Contraction of heart in the original position and isolated heart of frog were significantly shortened. According to the above result, it is expected that Aebaegeum can be widely applicable to the treatment of epistaxis.