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이동규,이성진,Dong Kyu Lee,Sung Jin Lee 대한안과학회 2009 대한안과학회지 Vol.50 No.1
Purpose: To report a case of a macular pseudohypopyon in the right eye in bilateral Terson's syndrome. Case summary: During a right eye vitrectomy of a 56-year-old female patient who showed bilateral Terson's syndrome with subarachnoid hemorrhage, a macular pseudohypopyon was observed. In an oval-shaped subinternal limiting membrane cyst (4×2 diameter size disc) including the central fovea, white exudates with fluid levels were present. The macular pseudohypopyon in the right eye was suspected to have occurred during the absorption of the subinternal limiting membrane hemorrhage. In the left eye, white exudates were clustered in the central fovea. In the right eye, the central fovea was above the fluid level of the pseudohypopyon, and corrected visual acuity was 1.0 after 6 months. Two months after the operation, the pseudohypopyon was absorbed.
이동규,김해봉,양병도,김영석,이형규,Lee, Dong-Kyu,Jin, Hai-Feng,Yang, Byung-Do,Kim, Young-Suk,Lee, Hyung-Gyoo 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.8
The devices based on electrically erasable programmable read-only memory (EEPROM) structure are proposed for the detection of external electric charges. A large size charge contact window (CCW) extended from the floating gate is employed to immobilize external charges, and a control gate with stacked metal-insulator-metal (MIM) capacitor is adapted for a standard single polysilicon CMOS process. When positive voltage is applied to the capacitor of CCW of an n-channel EEPROM, the drain current increases due to the negative shift of its threshold voltage. Also when a pre-charged external capacitor is directly connected to the floating gate metal of CCW, the positive charges of the external capacitor make the drain current increase for n-channel, whereas the negative charges cause it to decrease. For an p-channel, however, the opposite behaviors are observed by the external voltage and charges. With the attachment of external charges to the CCW of EEPROM inverter, the characteristic inverter voltage behavior shifts from the reference curve dependent on external charge polarity. Therefore, we have demonstrated that the EEPROM inverter is capable of detecting external immobilized charges on the floating gate. and these devices are applicable to sensing the pH's or biomolecular reactions.
방향성 결합기 및 핀 다이오드 스위치를 이용한 10 비트 임피던스 튜너
이동규,이상효,권영우,Lee, Dong-Kyu,Lee, Sang-Hyo,Kwon, Young-Woo 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.7
본 논문에서는 방향성 결합기를 이용한 새로운 형태의 임피던스 튜너를 제안하였다. 이 튜너를 signal flow graph를 이용하여 해석하였고, 이 방식은 직렬 라인의 길이 변화가 어려운 single stub 방식에 비해 구현이 용이하고 double stub 방식에 비해 넓은 튜닝 범위를 가진다. 10개의 핀 다이오드를 이용하여 제작된 튜너는 10개의 스위치가 비트 형태로 동작하면서 Smith 차트 전 영역에서 $2^{10}$개의 균일한 임피던스 분포를 가지도록 설계되었다. 제작된 튜너는 $1.8{\sim}2.2GHz$의 대역폭에서 넓은 튜닝 영역을 가지며, 반사 계수 크기는 최대 0.9까지 측정되었다. 측정된 임피던스 값을 바탕으로 load-pull 시스템을 구성하였고, 전력 소자용 트랜지스터의 최적 출력단 임피던스를 찾아내었다. In this paper, a novel impedance tuner using a directional coupler is proposed. The design topology is analyzed by signal flow graph(SFG) and shows advantages compared with conventional single and double stub methods from the view points of easy implementation and wide tuning range, respectively. This impedance tuner consists of ten switches and its $2^{10}$ tuning points are distributed uniformly on the whole Smith chart. The measured maximum magnitude of the reflection coefficient is 0.9. And the fabricated impedance tuner has a wide bandwidth from 1.8 to 2.2 GHz. Using this impedance tuner, we did a load-pull measurement of a power transistor.
이동규,이두수,Lee, Dong-Gyu,Lee, Du-Su 대한전자공학회 2001 電子工學會論文誌-SP (Signal processing) Vol.38 No.6
기존의 블록 정합 알고리듬에서는 움직임 벡터로 평면적인 움직임만을 기술할 수 있었고 이로 인해 블록화 잡음이 발생하였다 이러한 문제점을 해결하기 위해서 삼각형 메쉬를 이용한 움직임 추정방법이 제안되었다. 영상을 일정한 크기의 삼각형으로 분할하고 같은 연결 상태를 가지도록 하는 정규화 메쉬는 메쉬의 구조를 기술하기 위한 추가적인 정보가 필요 없으나 움직임이 많은 영역과 작은 영역을 같은 크기의 메쉬로 분할함으로써 성능을 저하시키게 된다 본 논문에서는 정규화 메쉬의 형태를 유지하면서 움직임영역에 따라 메쉬의 크기와 연결상태가 가변될 수 있는 동적 정규화 메쉬를 사용한 움직임 추정방법을 제안한다. 실험결과를 통해 제안한 방법이 기존의 블록 정합 방법이나 정규화 메쉬 방법보다 PSNR이 향상된 결과를 얻을 수 있었고 노드의 재정렬시에도 다른 방법보다 초기 수렴속도가 우수함을 알 수 있었다. In Conventional BMA, the motion vector can describe only translational movement and blocking noise is generated. To overcome this defect, motion estimation using triangular mesh has been proposed. The regular mesh is the method of dividing the image area into equal size triangle and haying the same node connection. It has no additional information about mesh structure, but do not reflect the real motion because it represents the regions by equal mesh structure regardless of the amount of motion. In this paper, motion estimation using dynamic regular mesh is proposed, In this method, the mesh structure is varied from the amount of motion and maintain the form of regular mesh. By the simulation, proposed method have better performance in PSNR and is superior to the other method in convergence rate.
건설재료의 안전적 제어를 위한 표준물질 (Standard Reference Materials) 도출
이동규,이건우,최명성,Lee, Dong Kyu,Lee, Keon Woo,Choi, Myoung Sung 한국안전학회 2017 한국안전학회지 Vol.32 No.5
The purpose of this study is to develop standard reference materials for safety control of construction materials considering the required performance of standard materials including flow performance incorporating particles. The flow characteristics of concrete are very complicated depending on mixing proportions of constituent materials, admixtures, amount of mixing, type of mixer, time of mixing, temperature and so forth. Uncertainties and multidimensional properties of concrete have been evaluated through various studies but there are few researches for the development of standard reference material. In this study, based on the rheological concept, the flow performance of construction materials was evaluated to understand the properties of standard reference materials and was finally obtained representing materials which simulate the standard reference materials.
귀인이론(歸因理論) 기반의 지역 공공인재학부 교육사업 성과평가에 관한 연구 - 동아대학교 석당인재학부 교육사업에 있어 집단별 의식차이 분석을 중심으로 -
이동규(Dong-Kyu Lee),민연경(Youn-Kyoung Min) 한국지방행정학회 2017 한국지방행정학보 (KLAR) Vol.14 No.1
The purpose of study is to identify influences of attribution of university headquarters, executive direction and management, student three groups - establishment・ establishment, management, entrance - to the performance evaluation index. This study offers development plan of the public sector honors college by analysing difference in group consciousness to the comparative significance of performance evaluation index for co-creation. The study attempt to investigate attribution theory and difference in group consciousness based on the 1st actions of 3 group results(establishment・ establishment, management, entrance) affect the performance evaluation indexes. For that, this study has developed 19 indicators, 5 Items for performance evaluation using program logic model and AHP method focusing on the seokdang honors college of Dong-A University. Analysis was pronounced differences between groups consciousness. University headquarters perceived the number of people passing exams, employment rates than other groups as important factors because university provides various benefits to attract talented student. On the other hand, executive direction and management perceived performance index of consultation program, training, attendance, the number of host because student motivation recognized as important. Student who demand for education services are recognized scholarship benefits(budget), the number of people passing exams of imput・initiative outcome item as major factors by opportunity costs for entrance to university located in Seoul. The study results suggest need for student・parents satisfaction as key performance indicator, good communication within the 3 groups of public sector honors college in order to improve the quality of operation since awareness about 17 of 19 performance indicators was a big gap. The study shows need for maintaining consistency・durability in government s policy to foster motivated talent in the community and joint venture creation.