• 한국산학기술학회논문지
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• 제14권7호
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• pp.3502-3507
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• 2013

스카이브릿지가 연결되는 건물에 강접합될 경우에는 비정형성이 크게 되어 지진하중에 매우 불리하게 거동할 수 있다. 따라서, 마찰진자베어링(FPS)이나 납고무베어링(LRB)와 같은 연결시스템을 사용하여 스카이브릿지와 구조물을 연결하게 된다. 이러한 연결시스템은 큰 지진하중이 발생하였을 때 스카이브릿지가 연결된 건물에서 분리되어 낙교하지 않도록 신중하게 설계되어야 한다. 본 논문에서는 수직방향 인장력에대해서 저항성이 없는 마찰진자감쇠기를 이용한 연결시스템을 설계하는 과정에서 반드시 검토해야할 사항을 분석하였다. 이를 위하여 실제 시공된 누리꿈 스퀘어를 예제구조물로 선택하였고 예상되는 지진하중이 가해졌을 때 스카이브릿지 연결시스템에서 발생하는 응답을 분석하여 낙교를 방지할 수 있는 설계 프로세스를 정립하였다.

• 한국자기공명학회논문지
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• 제3권1호
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• pp.36-43
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• 1999

We present a pulse shape tailored for broadband decoupling for a system of spin-1/2's with scalar couplings as well. In crafting the pulse shape Coherent Averaging Theory and Fourier expansion method are used. The Fourier expansion coefficients are optimized numerically by applying the Simulated Annealing Method. The decoupling performance of the shaped pulse thus designed is then compared with the well-known composite pulse sequence, DIPSI-2. It is shown that the shaped pulse performs well even at the conditions where the DIPSI sequence begins to fail.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.492-494
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• 1999

To improve safety operation of urban transit, compatible design of signaling system is most important factor at future train operation and management. Therefore, signaling system should be designed compatible transport demand of target year. In addition, signaling system should be designed improved train safety, based fail-safe principle. Most of all, to solve passenger concentration, high density and to improve efficiency of train operation. Headway improvement of train is most important. Train organization length of new urban transit as light rail is generally shorter than EMU. Therefore, to increase passenger service and operation efficiency, minimum headway of one minute in this system should be important required.

• 전기전자학회논문지
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• 제22권3호
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• pp.882-885
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• 2018

시스템의 동작 속도가 빨라짐에 따라 인쇄 회로 기판(PCB: printed circuit board)에서 신호 무결성 문제가 매우 중요해지고 있다. 지금까지는 관습적으로 PCB 면적을 줄이고 가격을 낮추도록 설계하는데 치중해왔다. 그러나 초고속으로 동작하는 PCB에서는 유전체 특성, 배선 폭, 배선 간격, 임피던스 정합 등을 고려하여 정밀하고 세심하게 설계하지 않으면 제대로 동작하기 어렵다. 본 논문에서는 초고속 PCB에서 생기는 여러 가지 문제점과 이를 완화할 수 있는 다양한 설계 기법에 대해 살펴본다.

• 한국지진공학회논문집
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• 제23권3호
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• pp.169-181
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• 2019

Seismic performance of ordinary reinforced concrete shear wall systems commonly used in high-rise residential buildings is evaluated. Three types of shear walls exceeding 60m in height are designed by performance-based seismic design. Then, incremental dynamic analysis is performed collapse probability is assessed in accordance with the procedure of FEMA P695. As a result, story drift, plastic rotation, and compressive strain are observed to be major failure modes, but shear failure occur little. Collapse probability and collapse margin ratio of performance groups do not meet requirement of FEMA P695. It is observed that critical wall elements fail due to excessive compressive strain. Therefore, the compressive strain of concrete at the boundary area of the shear wall needs to be evaluated with more conservative acceptance criteria.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.23-24
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• 2023

In this study, an easily recyclable separable glued-laminated timber (GLT)-steel beam was developed, and a structural design method was presented. The GLT and steel were mechanically composited using self-tapping screws. The GLT-steel beam was designed to fail in the compression of GLT. The bending moment and load-carrying capacity of the GLT-steel beam were predicted based on composite beam theory and compared with experimental test data. As a result, the GLT-steel beam exhibited ductile behavior, and compression failure of GLT was observed. The screw connection showed no damage while the steel plate was extended. The load-carrying capacity of GLT after failure was similar to the load resistance predicted by the compressive strength of GLT and the tensile strength of steel. This indicates that the ductile behavior of the GLT-steel beam can be safely designed by the tensile strength (yield) of steel.

• 한국정보통신학회논문지
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• 제16권7호
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• pp.1455-1462
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• 2012

본 논문에서는 BCD 공정 기반으로 PMIC용 고신뢰성 24비트 듀얼 포트(dual port) eFuse OTP 메모리를 설계하였다. 제안된 dynamic pseudo NMOS 로직회로를 이용한 프로그램 데이터 비교회로는 program-verify-read 모드에서 프로그램 데이터와 read 데이터를 비교하여 PFb(pass fail bar) 핀으로 비교 결과를 출력한다. 그래서 한 개의 PFb 핀만 테스트하므로 eFuse OTP 메모리가 정상적으로 프로그램 되었는지를 확인할 수 있다. 그리고 program-verify-read 모드를 이용하여 프로그램된 eFuse 저항의 변동을 고려한 가변 풀-업 부하(variable pull-up load)를 갖는 센싱 마진 테스트 회로를 설계하였다. Magnachip $0.35{\mu}m$ BCD 공정을 이용하여 설계된 24비트 eFuse OTP 메모리의 레이아웃 면적은 $289.9{\mu}m{\times}163.65{\mu}m$($=0.0475mm^2$)이다.

• 조명전기설비학회논문지
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• 제15권6호
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• pp.20-26
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• 2001

본 논문에서는 터널의 내공변위를 측정하고 측정된 데이터를 효율적으로 관리하는 계측 시스템을 설계하였다. 계측 시스템은 마이크로콘트롤러로와 포텐시오메터형 변위센서로 구성되는 Intelligent Sensing Head와 계측 시스템을 운용하고 측정된 데이터를 관리하는 호스트 컴퓨터로 구성된다. Intelligent Sensing Mead와 호스트 컴퓨터는 다중노드 통신방식에 의하여 연결되며 다중노드 네트워크의 안정된 동작을 위하여 Daisy-Chain 형태로 네트워크를 구성하였고 Fail-Safe 회로를 설계하였으며 Modbus 프로토콜을 사용하여 시스템의 범용성을 높였다. 호스트 컴퓨터는 종합관리 소프트웨어에 의하여 다양한 측정조건을 선택할 수 있으며 데이터베이스를 이용하여 측정된 데이터를 관리한다. 설계된 시스템은 터널에 설치되어 효용성을 확인하였다.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2002년도 춘계 학술발표회 논문집
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• pp.250-257
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• 2002

Pseudo dynamic test is an on-line computer control method to achieve the realism of shaking table test with the economy and versatility of the conventional quasi-static approach Pseudo dynamic tests of six full-size RC bridge piers have been carried out to investigate their seismic performance. For the purpose of precise evaluation, the experimental investigation was conducted to study the seismic performance of the real size specimen, which is constructed for highway bridge piers in Korean peninsula. Since it is believed that Korea belongs to the moderate seismicity region, five test specimens were designed in accordance with limited ductility design concept. Another one test specimen was nonseismically designed according to a conventional code. Important test parameters were transverse reinforcement and lap splicing. Lap splicing was frequently used in the plastic hinge region of many bridge columns. Furthermore, the seismic design code is not present about lap splice in Korean Roadway Bridge Design Code. The results show that specimens designed according to the limited ductility design concept exhibit higher seismic resistance. Specimens with longitudinal steel lap splice in the plastic hinge region appeared to significantly fail at low ductility level.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 봄 학술발표회 논문집
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• pp.885-890
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• 2002

Pseudo dynamic test is an on-line computer control method to achieve the realism of shaking table test with the economy and versatility of the conventional quasi-static approach. Pseudo dynamic tests of four full-size RC bridge piers have been carried out to investigate their seismic performance. For the purpose of precise evaluation, the experimental investigation was conducted to study the seismic performance of the real size specimen, which is constructed for highway bridge piers in Korean peninsula. Since it is believed that Korea belongs to the moderate seismicity region, three test specimens were designed in accordance with limited ductility design concept. Another one test specimen was nonseismically designed according to a conventional code. Important test parameters were transverse reinforcement and lap splicing. Lap splicing was frequently used in the plastic hinge region of many bridge columns. Furthermore, the seismic design code is not present about lap splice in Korean Roadway Bridge Design Code. The results show that specimens designed according to the limited ductility design concept exhibit higher seismic resistance. Specimens with longitudinal steel lap splice in the plastic hinge region appeared to significantly fail at low ductility level.