• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.987-997
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• 2008

Successful design, construction and maintenance of geotechnical structure in soft ground and marine clay demands prediction, control, stability estimation and monitoring of settlement with high accuracy. It is important to predict and to estimate the compression index of soil for predicting of ground settlement. Lab. and field tests have been and are indispensable tools to achieve this goal. In this paper, Artificial Neural Networks (ANNs) model with Levenberg-Marquardt Algorithm and field database were used to predict compression index of soil in Korea. Based on soil property database obtained from more than 1800 consolidation tests from soils samples, the ANNs model were proposed in this study to estimate the compression index, using multiple soil properties. The compression index from the proposed ANN models including multiple soil parameters were then compared with those from the existing empirical equations.

• 터널과지하공간
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• 제27권5호
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• pp.295-302
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• 2017

본 연구에서는 폐광지역 지반침하 관리시 토목분야(도로, 철도 등)의 계측관리기준을 그대로 준용하고 있는 현행 계측수행 상의 문제점을 개선하기 위해 광산분야에서 적용할 수 있는 새로운 정량적 계측관리기준을 제시하였다. 광해관리공단의 협조를 얻어 폐광지역에서 수행된 지반침하 관련 자료들을 수집하였고, 이 중 현장에서 실측된 수동계측자료들을 토대로 새로운 계측관리기준치 설정에 대한 여러 기법들에 대해 연구하였다. 그 결과, 계측치들의 평균값, 3사분위수, 95% 신뢰도, 최대값 등의 통계량을 통해 계측항목별 계측관리기준치를 설정, 제안하였다.

• Geomechanics and Engineering
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• 제22권4호
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• pp.349-359
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• 2020

Quantification of the influence of the fracture of thick magmatic rock (TMR) on the behavior of its overlying strata is a prerequisite to the understanding of the deformation behavior of the earth's surface in deep mining. A three-dimensional numerical model of a special geological mining condition of overlying TMR was developed to investigate the overburden movement and fracture law, and compare the influence of the occurrence horizon of TMR. The research results show that the movement of overlying rock was greatly affected by the TMR. Before the fracture of TMR, the TMR had shielding and controlling effects on the overlying strata, the maximum vertical and horizontal displacement values of overlying strata were 0.68 m and 0.062 m. After the fracture, the vertical and horizontal displacements suddenly increased to 3.06 m and 0.105 m, with an increase of 350% and 69.4%, respectively, and the higher the occurrence of TMR, the smaller the settlement of the overlying strata, but the wider the settlement span, the smaller the corresponding deformation value of the basin edge (the more difficult the surface to crack). These results are of tremendous importance for the control of rock strata and the revealing of surface deformation mechanism under TMR mining conditions in mines.

• 한국터널지하공간학회 논문집
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• 제4권2호
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• pp.91-100
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• 2002

본 논문에서는 수평보강재로 보강된 터널막장의 거동에 관한 내용을 다루었다. 터널막장 보강공법에 있어서 보강조건이 막장의 수평변위 및 지표침하에 미치는 영향을 고찰하기 위해 축소 모형실험을 수행하였다. 실험결과 수평보강재로 터널막장을 보강할 경우 막장의 변위 및 지표침하가 현저히 감소하는 것으로 나타나 도심지 터널시공에 있어서 지반거동 억제를 위한 보조 공법으로서 효과적으로 적용될 수 있는 것으로 나타났다. 아울러 지반거동 억제 효과는 보강조건에 따라 현저히 차이를 보이는 것으로 나타났다. 본 고에서는 연구결과를 종합하여 실무 적용시 주안점을 고찰하였다.

• 무역상무연구
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• 제37권
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• pp.133-158
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• 2008

The purpose of this article is to examine the "Annulment" of ICSID Arbitration Award. Most of the international conventions provide for arbitration as the preferred method of dispute settlement. In general they either provide for ad hoc arbitration under the UNCITRAL Rules or under the rules of an acceptable arbitration institution, e.g. ICC, AAA, LCIA and in particular ICSID. The most distinctive feature of ICSID arbitration is the self-contained and exhaustive nature of its review procedures. Unlike other arbitration regimes, control is exercised by internal procedures rather than by the courts. Remedies against the award are limited to those provided for in the Convention and do not include court involvement. Especially, the annulment of the ICSID award by an ad hoc committee must be considered as jeopardizing ICSID Arbitration because it clearly depart from the current trends of international commercial arbitration which limits any kinds of judicial review and excludes any kinds of review on the merits. I wish that the future decisions of the ad hoc committees will restore a narrow scope to the ICSID procedure of annulment in order not to endanger the ICSID Arbitration mechanism.

• 풍력에너지저널
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• 제13권4호
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• pp.70-79
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• 2022

It is difficult to control differential settlement and long-term settlement on soft ground with the template used in the pre-filing method of offshore wind power. In this study, the template adopted a suction foundation with high utility on soft ground. To analyze the penetration performance of the doughnut-type suction foundation, step-by-step numerical analysis was applied by calculating the minimum suction pressure needed for ground penetration at that depth. Scale model tests were performed and compared with the numerical analysis results. The ratio of the inside diameter compared to the outside diameter is higher, and penetration by suction was more advantageous than push-in load penetration. The step-by-step numerical analysis method showed an error within 2 % compared to the model tests, so the numerical analysis method confirmed results that the penetration performance of the doughnut-type suction foundation is valid.

• Steel and Composite Structures
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• 제52권5호
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• pp.571-581
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• 2024

After a disaster like the catastrophic earthquake, the government have to use rapid assessment of the condition (or damage) of bridges, buildings and other infrastructures is mandatory for rapid feedbacks, rescue and post-event management. This work studies the tracking control problem of a class of strict-feedback nonlinear systems with input saturation nonlinearity. Under the framework of dynamic surface control design, RBF neural networks are introduced to approximate the unknown nonlinear dynamics. In order to address the impact of input saturation nonlinearity in the system, an auxiliary control system is constructed, and by introducing a class of first-order low-pass filters, the problems of large computation and computational explosion caused by repeated differentiation are effectively solved. In response to unknown parameters, corresponding adaptive updating control laws are designed. The goals of this paper are towards access to adequate, safe and affordable housing and basic services, promotion of inclusive and sustainable urbanization and participation, implementation of sustainable and disaster-resilient buildings, sustainable human settlement planning and manage. Simulation results of linear and nonlinear structures show that the proposed method is able to identify structural parameters and their changes due to damage and unknown excitations. Therefore, the goal is believed to achieved in the near future by the ongoing development of AI and control theory.

• 산업경영시스템학회지
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• 제15권25호
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• pp.63-74
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• 1992

This study proposes D- shortage control system which is a convenient tool for cooperative companies to reduce shortages which frequently break out between the manufacturing companies and the cooperative companies. On the ground of theoretical analysis of MRP and JIT system, D- shortage control system sets up a schedule that secures the delivery date by precedent scheduling( D-) comparing with MRP It also syncronizes business, production and release, and builds the pull system comparing with JIT. The factors causing shotages are the scheduling absurdity and the controlling absurdity. The scheduling absurdity can be settled by the calculating required quantity method of MRP and the controlling absurdity can be settled by daily control of business, production and pruchasing fuctions by the pull system of JIT. And the inventory and the WIP can be reduced by the operating of PULL system and by the settlement of D- shortage control practices. The Application of D- shortage control system, therefore, enables the rationalization of logistics and reduces the inventory And it leads to the reinforced competitiveness and the security of subsistence of manufacturer by the cost ruduction, the reduction of financial difficulty, and the insurance of the delivery date.

• 한국지반공학회논문집
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• 제24권6호
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• pp.5-16
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• 2008

오염지반에 편재하중이 작용하는 경우에 있어서 지반의 소성화로 인한 측방유동에 대한 안정관리방법을 규명하기 위하여 기존의 이론적인 배경을 고찰하고, 모형실험을 통하여 실측한 결과를 상호 비교 분석하였다. ML과 $ML_{p1},\;ML_{p2}$ 모두 하중(q)-침하량$(S_v)$ 곡선에서 얻어진 극한지지력은 부영(富永) 교본(橋本) 의 변위량$(S_v-Y_m)$에 대한 관리도, 송미(松尾) 천촌(川村)의 $\{S_v-(Y_m/S_v)\}$의 관리도, 자전(紫田) 관구(關口)의 $(q/Y_m)-q$의 관리도에서 얻어진 극한지지력과 상당히 유사하게 나타나고 있어 실제 적용시 무리가 없을 것으로 사료된다. $ML_{p1}$의 송미(松尾) 천촌(川村)의 $\{S_v-(Y_m/S_v)\}$ 관리도에서 얻어진 극한하중은 하중-침하량 곡선$(q-S_v)$에서 얻어진 극한하중 값보다 작은 값을 보이고 있다. 송미(松尾) 천촌(川村)의 안정관리도의 파괴기준선에 대한 ML의 산정식 ${S_v=3.21exp}\{-0.48(Y_m/S_v)\}$이며, $ML_{p1}$의 산정식 ${S_v=3.173exp}\{-0.45(Y_m/S_v)\}$, $ML_{p2}$의 산정식 ${S_v=6.33exp}\{-0.45(Y_m/S_v)\}$으로 결정할 수 있다.

• 한국양식학회지
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• 제8권2호
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• pp.133-140
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• 1995

넙치, Paralichthys olivaceus 자어의 높은 사망율을 감소시키기 위한 연구의 일환으로 thyroid hormone을 이용하여 착저를 유도하였다. 적정 처리 시기를 알기 위하여 발달 단계가 서로 다른 변태 전 단계(pre-metamorphic stage)와 초기 변태 단계(early metamorphic stage)의 자어를 이용하였고, triiodothyronine $(T_3)$ 및 thyroxine $(T_4)$두 종류의 thyroid hormone을 0.02,0.04,0.08 및 0.16ppm의 다양한 농도로 침지 처리하였다. 변태 전 단계의 자어에 있어 착저가 완료되는 시기는 0.02 ppm $T_3$및 $T_4$ 처리군이 대조군보다 2일 단축되었고, 농도의 증가에 따라 그 시기가 짧아져서 가장 높은 농도인 0.16 ppm $T_3$ 처리군은 7일이 단축되었다. 변태 초기 단계에서는 각각 4일 및 7일 단축되었다. 한편 호르몬 종류에 따른 착저 유도 효과는 $T_4$보다 $T_3$가 더 강한 것으로 나타났다. 생존율은 변태 전 단계 실험군 중 대조군이 $90.7\%,\;T_3$ 처리군이 $85.6\~73.6\%,\;T_4$ 처리군이 $89.7\~80.7\%$로 호르몬 처리군이 다소 낮았으나 유의한 차이는 없었다. 또 초기 변태 단계 실험군에 있어서는 대조군이 $96.0\%,\;T_3$ 및 $T_4$ 처리군이 $92.7\~99.3\%$로 큰 차이가 없었다. 성장에 있어서 호르몬 처리군이 대조군보다 약간 낮았으나 0.02 ppm $T_4$ 처리군은 대조군과 비슷하였다.