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Coarse/Fine 루프를 이용한 3.125Gbps 빠른 클럭 데이터 복원회로
노병진(Byeong-Jin Noh),강진구(Jingu Kang) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
In this paper, the clock and data recovery circuit using Coarse/Fine Loop is proposed for achieving fast Locking. the part of locking the frequency in CDR is composed of two Loop : Coarse Loop and Fine Loop. Each Loop is designed separate phase frequency and charge pump and Phase Detector part using 4X oversampling method operate near Locking condition. It operates at 3.125Gbps and jitter is 50㎰. Total CDR is designed a 0.18 CMOS technology. total power consumption is 150㎽.
윤현수,노병진,윤성규,강기천,Hyeonsu Yun,Byeongjin Roh,Seong-Kyu Yun,Gichun Kang 한국지반신소재학회 2024 한국지반신소재학회 논문집 Vol.23 No.1
Recently, the frequency and intensity of typhoon-induced wave loading are increasing due to changed marine environments such as climate change. In addition, frequent earthquakes are causing a lot of damage around the world, including in Japan, Chile, Haiti, China, and Indonesia. In Korea, damage from typhoons has also been increasing since the 2000s, and the frequency and intensity of earthquakes are also increasing. Korea is surrounded by sea on three sides, so typhoons can cause a lot of damage to coastal structures, and earthquakes also cause a lot of damage to coastal structures. As such, the frequency and intensity of typhoon-induced wave loading and earthquakes are increasing both domestically and internationally, but there is no research linking typhoons and earthquakes. Therefore, in this study, numerical analysis was performed for a total of four cases by linking typhoon waves and earthquakes to the caisson breakwater. Numerical analysis was performed by applying wave loads in Case 1 and seismic wave in Case 2, seismic wave after wave loads in Case 3, and wave loads after seismic wave in Case 4. As a result of the numerical analysis, it was confirmed that in Case 3 and Case 4, which linked a typhoon and earthquakes, the damage caused by each load increased compared to Case 1 and Case 2 because the load was applied while the existing ground strength was reduced. In addition, it was confirmed that the greatest damage occurred in Case 3, in which seismic wave were applied after the wave loads.
소규모 지하굴착에서 지중경사계와 변형률계의 최적 위치 선정에 대한 연구
강기천,박진욱,노병진,손가호,윤성규 한국지반신소재학회 2023 한국지반신소재학회 논문집 Vol.22 No.2
Currently, there are cases in Korea where economic damage has occurred due to the ambiguity instrument installation and operation standards in the construction of temporary earth retaining wall, failing to prevent collapse of temporary earth retaining wall at the construction site in advance. Therefore, in this study, a numerical analysis was conducted to find the appropriate installation location of the inclinometer and strain gauge among the installed instruments shown in the design drawing of the temporary earth retaining wall. As a results, It was found that the installation position of the underground inclinometer is the corner of the retaining wall in the case of plane-deformation analysis, and the most displacement occurs in the center of the excavation surface in the case of 3D analysis. When the stress and moment are comprehensively analyzed, the corner is judged to be a vulnerable point. In the case of the strain gauge, In plane-deformation analysis and 3D analysis, the maximum bending stress occurred at the wale connection where the end of the strut and the counter strut are in contact. At this point, it is analyzed that it is necessary to focus on installing and managing the connection to prevent accidents from being vulnerable. 현재 국내에서는 흙막이 가시설 공사에서 계측기 설치 및 운영기준이 모호하여 공사현장에서 흙막이 공사의 붕괴사고를 사전에 예방하지 못하여 경제적 피해가 발생한 사례가 있다. 따라서 본 연구에서는 흙막이 가시설 설계도면에 제시되어 있는계측기 중 지중경사계 및 변형률계의 적합한 설치 위치를 찾고자 수치해석을 통한 연구를 진행하였다. 해석결과 지중경사계의설치 위치는, 평면변형 해석의 경우 가시설의 우각부에서, 3차원 해석의 경우는 굴착면의 중심부에서 가장 많은 변위가 일어나는 것으로 나타났다. 지반응력과 모멘트를 종합적으로 분석하였을 때 우각부가 취약지점으로 판단된다. 변형률계의 경우 평면변형 해석과 3차원 해석에서 버팀대 끝단과 맞버팀대가 접하는 띠장 접속부에서 최대 휨 응력이 발생하였다. 이 지점에서취약 부분으로 사고예방을 위해서는 접속부에 중점적 설치 및 관리가 필요한 것으로 분석된다.