• 한국지반환경공학회 논문집
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• 제10권3호
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• pp.63-71
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• 2009

대도시에서의 공사는 외부방향이 아닌 상부로 진행되기 때문에 현장의 벽면 움직임은 매우 중요하다. 고층 구조물은 주차장을 위한 여분의 공간 확보뿐 아니라 건물의 잠재적 침하를 줄이기 위하여 일반적으로 깊은 굴착을 수반한다. 이러한 대형 굴착은 깊은 심도에 따른 횡방향 지중압력에 견디기 위한 견고한 브레이싱 시스템을 필요로 한다. 벽체 움직임은 잠재적인 인접 구조물의 침하를 허용하기 때문에 sheetpile 이나 diaphragm wall과 같은 옹벽구조물의 변형을 예측하는 방법은 매우 중요하다. 사례들을 분석하고 측정된 벽체 변형은 경험적 도표로부터 예측된 값들과 비교되었다.

• International Journal of Internet, Broadcasting and Communication
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• 제10권3호
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• pp.136-145
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• 2018

The disaster monitoring technique by combination of the measurement method and the fine precision of the sensor collecting the satellite-based information that can determine the displacement space is available in a variety of diagnostic information and the GIS/GNSS by first sensor it is being requested from them. Be large and that the facility is operated nationally distributed torsional displacement of the terrain and facilities caused by such natural disasters progress of various environmental factors and the surroundings. To diagnose this spatial information, which contains the various sensors and instruments tracks the precise fine displacement of the main construction structures and the first reference in the Geospatial or more three-dimensional detailed available map and location information using the installed or the like bridges and tunnels produced to a USN/IoT change at any time, by combining the various positioning analysis of mm-class for the facility main area observed is required to constantly in the real time information of the USN/IoT environment sensor, and to utilize this as a precise fine positioning information by UAV/Drone to the precise fine displacement of the semi-permanent infrastructures. It managed to be efficient management by use of new technologies, analyzing the results presented to a method capable of real-time monitoring for a large structure or facility to construction disaster prevention.

• 한국전산구조공학회논문집
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• 제31권1호
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• pp.1-8
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• 2018

본 연구의 목적은 강성 개폐식 대공간 건축물의 비정형 입체트러스를 파라메트릭 기법을 적용하여 모델링을 구현하는데 있다. 개폐식 대공간 건축물은 비선형성 형상을 모델링하거나 다수의 모델을 대안별로 생성, 해석, 검토하는 과정에 많은 시간과 기술이 소요되는 것이 현 실정이다. 이러한 문제점을 해결하기 위해서 첫째로, 개발에 사용된 파라메트릭 모델링 전산도구를 소개하고, 강성 개폐식 대공간 건축물의 비정형 입체트러스를 분석하며, 개발한 입체트러스의 파라메트릭 컴포넌트로 모델링을 구현하게 된다. 따라서 지붕이 개폐되는 방식으로 구분한 입체 트러스 종류의 모델링을 구현해 낼 수 있는 컴포넌트를 형상이나 기능에 따른 각각 대안별로 개발하여 효율적인 개폐식 지붕의 모델링을 가능하게 하는 것이 추후 연구사항이다.

• 대한인간공학회:학술대회논문집
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• 대한인간공학회 1995년도 추계학술대회논문집
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• pp.214-218
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• 1995

A lot of design guidelines have been proposed for menu-drive interfaces, but they are applicable only to the menus on ordinary CRT displays. Many hardware products, however, cannot employ large displays because of the cost and space limitations. Instead, a single-line display menu (SDM) is widely used, and the designers need useful guidelines applicable to the SDM. A focus is often placed upon the optimal menu structure, but only the standard menu structures, such as $64^{\1}, 8^{\2}, 4^{\3}, and 2^{\6}$, are tested for optimality. In many cases, however, ill defined or asymmetric structures are suggested as design alternatives. To determine the optimal menu structure, user performance should be obtained in terms of quantitative measures for each of the optional structures considered. Hence, a model is needed to provide a predicted value of user performance for a given menu structure. Although severaal models have been proposed for ordinary menus, none is available for the SDM yet. A performance model was developed in this study using the neural network approach. A The model developed in this study is capable of providing quantiative measures of human performance for any menu structures without conducting additional experiments, which will save much time and reduce the design cost.

• Smart Structures and Systems
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• 제10권4_5호
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• pp.331-351
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• 2012

In this study an output-only system identification technique for civil structures under ambient vibrations is carried out, mainly focused on using the Stochastic Subspace Identification (SSI) based algorithms. A newly developed signal processing technique, called Singular Spectrum Analysis (SSA), capable to smooth a noisy signal, is adopted for preprocessing the measurement data. An SSA-based SSI algorithm with the aim of finding accurate and true modal parameters is developed through stabilization diagram which is constructed by plotting the identified system poles with increasing the size of data matrix. First, comparative study between different approaches, with and without using SSA to pre-process the data, on determining the model order and selecting the true system poles is examined in this study through numerical simulation. Finally, application of the proposed system identification task to the real large scale structure: Canton Tower, a benchmark problem for structural health monitoring of high-rise slender structures, using SSA-based SSI algorithm is carried out to extract the dynamic characteristics of the tower from output-only measurements.

• 한국지진공학회논문집
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• 제2권2호
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• pp.23-34
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• 1998

본 논문은 바닥판을 고려한 3차원 골조 구조물의 효율적인 연직 진동 해석법을 제안한다. 바닥판의 영향을 고려하면 구조물의 진동해석을 좀더 정확히 수행할 수 있는 반면, 면요소의 사용에 따른 많은 자유도의 사용으로 많은 해석시간과 기억용량이 필요하게 된다. 따라서, 행렬응축기법을 사용하여 적절한 요소분할 및 주자유도 선택 기법을 제안하였으며, 대형요소를 사용하여 정확화된 일반적인 건물의 동적해석에 적용하여 입력 데이터의 작성을 간단히 하고 동적해석을 빠르고 신뢰할 만한 결과를 얻을 수 있는 기법에 대하여 연구하였다.

• Bulletin of the Korean Chemical Society
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• 제16권12호
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• pp.1163-1167
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• 1995

The structures of dehydrated Ca4Na4-A (a=12.243(1) Å) and of its bromine sorption complex (a=12.214(1) Å) have been determined by single crystal x-ray diffraction techniques in the cubic space groupPm&bar{3}m at 21(1) ℃. Both crystals were dehydrated at 360 ℃ and 2 X 10-3 Torr for 2 days and one crystal was treated with 180 Torr of bromine vapor at 24 ℃ for 1 h. The structures were refined to final error indices, R1=0.066 and R2=0.078 with 192 reflections and R1=0.109 and R2=0.093 with 100 reflections, respectively, for which I>3σ(I). In these structures, four Ca2+ and four Na+ ions are located on two different threefold axes associated with 6-ring oxygens, respectively. In Ca4Na4-A·6Br2, four Ca2+ ions are recessed 0.28(1) Å into the large cavity and four Na+ ions extend 0.63(1) Å into the sodalite unit. A total of six dibromine molecules are sorbed per unit cell. Each Br2 molecule approaches a framework oxide ion axially with O(1)-Br(1)=3.27(2) Å Br(1)-Br(2)=2.66(6) Å and O(1)-Br(1)-Br(2)=172(1)°, indicating a charge-transfer interaction.

• 한국공간구조학회논문집
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• 제22권1호
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• pp.25-32
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• 2022

The seismic behaviors of the arch structure vary according to the rise-span ratio of the arch structure. In this study, the rise-span ratio (H/L) of the example arch structure was set to 1/4, 1/6, and 1/8. And the installation angle of the seismic isolator was set to 15°, 30°, 45°, 60° and 90°. The installation angles of the seismic isolator were set by analyzing the horizontal and vertical reaction forces according to the rise-span ratio of the arch structure. Due to the geometrical and dynamic characteristics of the arch structure, the lower the rise-span ratio, the greater the horizontal reaction force of the static load, but the smaller the horizontal reaction force of the dynamic load. And if the seismic isolator is installed in the direction of the resultant force of the reaction forces caused by the seismic load, the horizontal seismic response becomes small. Also, as the installation angle of the seismic isolator increases, the hysteresis behavior of the seismic isolator shows a plastic behavior, and residual deformation appears even after the seismic load is removed. In the design of seismic isolators for seismic response control of large space structures such as arch structures, horizontal and vertical reaction forces should be considered.

• Bulletin of the Korean Chemical Society
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• 제14권1호
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• pp.82-86
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• 1993

Two crystal structures of dehydrated $Ag_{3.3}Ca_{4.35}-A ({\alpha} = 12.256(2){\AA})$ and of its ethylene sorption complex (${\alpha} = 12.259(2){\AA}$) have been determined by single-crystal X-ray diffraction techniques in the cubic space group Pm3m at 21(l)$^{\circ}$C. Both crystals were dehydrated at 360$^{\circ}$C and $2{\times}10^{-6}$ Torr for 2 days and one crystal was treated with 200 Torr of ethylene at 24(2)$^{\circ}$C. The structures were refined to final error indices, $R_1$=O.065 and $R_2$ = 0.088 with 202 reflections and $R_1$=0.049 and $R_2$ = 0.044 with 259 reflections, respectively, for which I>3${\sigma}$(I). In these structures, all Ag$^+$ and Ca$^{2+}$ ions are located on two and three different threefold axes associated with 6-ring oxygens, respectively. In $Ag_{3.3}Ca_{4.35}-A{\cdot}6.65\;C_2H_4,\;3.3\;Ag^+\;and\;3.35\;Ca^{2+}$ ions are recessed 1.09 ${\AA}$ and 0.21 ${\AA}$, respectively, into the large cavity from the (111) plane at O(3). Each Ag$^+$ and Ca$^{2+}$ ion in the large cavity forms a complex with one $C_2H_4$$^{2+}$ ions and ethylene molecules are longer than those between Ag$^+$ ions and ethylene molecules.

• 한국터널지하공간학회 논문집
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• 제18권3호
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• pp.319-329
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• 2016

최근 대형화되고 있는 지하구조물은 평상시는 물론 지진시에도 안전성을 확보하여야 한다. 지하구조물의 특성상 지진시 지반운동의 크기와 관성력이 작고 일산 감쇠가 커서 지상구조물에 비해 지진에 유리하나 최근 발생한 지진에서 심각한 피해 사례를 경험한 바 있다. 따라서 지하구조물의 지진시 응답특성에 대한 보다 정밀한 접근이 필요하다. 본 연구에서는 호남~제주 해저터널의 가상단면에 대한 내진해석을 수행하여 지진시 터널 구조물의 응답특성을 분석하였다. 그 결과, 지진시 터널 라이닝에 발생하는 부재력은 파쇄대 및 연약대 구간에서 증가하는 것으로 나타났다. 또한 축방향 변형 시에는 단면이 큰 터널에서 라이닝의 부재력이 크게 산정되었으나 횡방향 변형 시에는 단면이 큰 터널에서 라이닝의 부재력이 작게 산정되는 경향을 보였다.