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지하공동 규모 평가를 위한 GPR 탐사 기반의 조사 연구
임한주,윤병조,김연규 한국재난정보학회 2023 한국재난정보학회 논문집 Vol.19 No.3
Purpose: The purpose of this study, GPR exploration method was carried out on both actual roadway and mock-up site to compensate for the problems caused by excavation and restoration process. Method: In the experiment on the actual roadway, there was no clear trend for the differences and the ratios of the cavity scales between GPR exploration results and identified cavity. The reason is assumed to be the collapse of cavity during the examination process. Thus, additional mock-up test was performed to prevent the cavity collapse by placing Styrofoam under the ground. Result: Although the soil depth of the predicted cavity and the identified cavity was similar, the difference in the longitudinal and cross-sectional width increased as soil depth increased. Therefore, cavity scales predicted by GPR explorations were larger than the actual cavities for the scale ratios of the longitudinal and cross sections. Conclusion: Based on the correlation between the predicted cavity scales by GPR exploration and the cavity scales identified in the mock-up test, it is possible to qualitatively estimate the cavity scales using the empirical formula proposed in this study.
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정상구,임한주 대한전자공학회 1983 전자공학회지 Vol.20 No.6
We report a theoretical study on wave propagation in magneto-optic thin-film waveguides. The field distribution and phase velocity of the guided hybrid modes are analyzed in terms of the phase difference of basic system modes and the Faraday rotation of the magneto-optic thin film. Splitting of the phase constant curves due to the F araday rotation is discussed. The present hybridmode analysis leads to a conversion matrix which shows that the distance dependence of the mode conversion in the guide is different from that in the bulk medium. 자성체 박막을 갖는 광도파판에서 전자파의 전파를 이론적으로 조사하였다. 광도파관이 갖는 혼합모드의 전계 및 자계의 분포, 또한 그들의 위상속도를 광도파관의 기본 모드의 위상차와 자성박막의 파라데이 회전각으로 나타냈으며 파라데이 효자에 의한 위상 특성곡선의 분할에 대하여 논하였다. 그리고 흔합모드의 이론으로 모드변환 행열을 도출한 결과, 전자파의 진행거리에 따른 모드변환이 광도파관에서는 bulk 매질과는 다름을 나타내었다.
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광역권 통근시간 만족도 영향요인 분석에 따른 대중교통 이용 활성화 방안연구
김연규,임한주,윤병조 한국재난정보학회 2023 한국재난정보학회 논문집 Vol.19 No.3
Purpose: The purpose of the Activation of Public Transportation by Analysis of Factors Influencing Satisfaction of Commuting Hours in the Metropolitan Area. Method: This study analyzed the factors affecting wide-area commuting time and satisfaction for office workers who perform wide-area commuting. Result: in the case of commuting satisfaction for wide-area commuting hours by region, commuting time satisfaction was relatively low in the metropolitan area as the average commuting time was high, and commuting time satisfaction was relatively high in the non-metropolitan area as the average commuting time was low. Conclusion: In the future, the government will establish or improve express railways and wide-area buses to reduce wide-area commuting time, and build urban highways to shorten passenger car use time, which will reduce commuting time, but qualitative indicators are more important. In other words, even if commuting time is long, life satisfaction increases, so quality of life is important, and it is necessary to improve commuting time satisfaction rather than simple indicators of commuting time, so both qualitative and quantitative aspects of commuting time need to be improved.
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