• 한국지반환경공학회 논문집
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• 제20권1호
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• pp.19-25
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• 2019

본 연구에서는 무선 센서 네트워크 시스템을 이용한 저수지 댐 시설물 전체의 모니터링 시스템의 적용성을 평가하고자 국내의 저수지 댐을 대표할 수 있는 구간을 시범구축 현장으로 선정해, 계측과 동시에 시설물의 상태를 평가할 수 있는 시스템을 구축, 운영하였다. 무선 센서 네트워크 구축을 위해 시설물의 현재 상태를 평가하여 위험인자를 도출함과 동시에 극한상태에서의 위험인자의 한계값을 도출하였다. 위험구역, 위험인자에 적합한 측정항목을 설정하여 현장에서 측정할 센서의 종류 그리고 위치를 결정하였다. 국내의 저수지 댐을 대표할 수 있는 필댐을 대상으로 현장에서 무선 센서 네트워크 시스템을 구축하여 모니터링 함으로써 시스템의 적용성을 평가하였으며, 현재 댐의 계측관리 기술인 부분 집중방식의 계측과 직접 비교함으로써 시스템의 적용성을 검증하였다.

• 한국콘텐츠학회논문지
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• 제21권3호
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• pp.400-409
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• 2021

교육훈련은 전인적 차원에서의 교육과는 달리, 한정된 특정 영역에서의 지식, 기술 습득을 통해 개인차원에서의 지식·기술 등 업무역량의 잠재력 뿐만 아니라, 조직적 차원에서의 직무성과에 영향을 미친다. 수원시 시민배심법정 모의상황학습에 참여한 공무원 교육훈련 프로그램에 대한 효과성 검증은 CIPP모형을 활용하여 분석하였다. 학습참여자는 교육프로그램에서 어떤 해결책을 도출하는 결과보다는 과정(process)에 대한 중요도를 높게 생각하는 것으로 나타났으며, 사전·사후평가를 비교·분석한 결과, 모의법정 실습을 통한 교육효과 및 향후 업무활용도에 도움정도가 교육 전에 비해 높게 나타나 그 효과가 입증되었다. 학습기획자 평가 결과와 더불어 학습프로그램에 대한 함의점으로, 다양한 학습자 상호간의 학습 상호작용을 위한 성별, 근무기간 등을 고려한 참여자 구성이 필요하며, 다양한 지역문제와 갈등상황에 대한 정보습득 교육 및 숙의학습 병행이 필요하다. 또한 학습의 실효성을 위한 현안사업과 관련된 맞춤형 갈등관리 교육을 통해 보완할 수 있다.

• 한국중재학회지:중재연구
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• 제34권1호
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• pp.3-26
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• 2024

"Arbitration" is a procedure to settle a dispute over property rights or disputes based on non-property rights that the parties can resolve through a reconciliation, not by a judgment of a court, but by an award of an arbitrator, and is a kind of Alternative Dispute Resolution(ADR). Arbitration is the most representative and efficient ADR system in many fields, so by activating it, disputes can be resolved smoothly and ultimately, and social costs caused by a heavy increase in lawsuit can be reduced. Arbitration costs are often evaluated as 'cheap', but in reality, they can be similar to or exceed litigation costs. Nevertheless, unlike the Civil Procedure Act, which stipulates the litigation aid system for those who are hard to pay litigation costs, the Arbitration Act or the Arbitration Industry Promotion Act does not have the arbitration aid system for those who are hard to pay arbitration costs. However, considering ① the utility of arbitration compared to other dispute resolution procedures, such as litigation, ② the possibility of resolving trial delays through vitalizing arbitration, ③ the need to guarantee access to arbitration, ④ the feasibility of revitalizing arbitration by the arbitration aid system, it is necessary to introduce the Arbitration Aid System. To explain the details of the Arbitration Aid System, a person who intends to apply for arbitration or a party who continues arbitration could be the applicant. Regarding the judge, this paper suggests the establishment of a council for arbitration aid to prevent the possibility of prejudgment by the arbitral tribunal. Also, if the council accepts the application for arbitration aid, it would be appropriate for the arbitral tribunal to determine the allocation of arbitration costs considering the decision of the council and to include it into arbitral awards.

• Structural Engineering and Mechanics
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• 제65권2호
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• pp.173-181
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• 2018

In this paper, finite element (FE) model updating based on multi-objective optimization with the surrogate model for a steel plate girder bridge is investigated. Conventionally, FE model updating for bridge structures uses single-objective optimization with finite element analysis (FEA). In the case of the conventional method, computational burden occurs considerably because a lot of iteration are performed during the updating process. This issue can be addressed by replacing FEA with the surrogate model. The other problem is that the updating result from single-objective optimization depends on the condition of the weighting factors. Previous studies have used the trial-and-error strategy, genetic algorithm, or user's preference to obtain the most preferred model; but it needs considerable computation cost. In this study, the FE model updating method consisting of the surrogate model and multi-objective optimization, which can construct the Pareto-optimal front through a single run without considering the weighting factors, is proposed to overcome the limitations of the single-objective optimization. To verify the proposed method, the results of the proposed method are compared with those of the single-objective optimization. The comparison shows that the updated model from the multi-objective optimization is superior to the result of single-objective optimization in calculation time as well as the relative errors between the updated model and measurement.

• Computers and Concrete
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• 제3권6호
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• pp.439-454
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• 2006

This paper develops an artificial neural network (ANN) model for uniformly loaded restrained reinforced concrete (RC) slabs incorporating membrane action. The development of membrane action in RC slabs restrained against lateral displacements at the edges in buildings and bridge structures significantly increases their load carrying capacity. The benefits of compressive membrane action are usually not taken into account in currently available design methods based on yield-line theory. By extending the existing knowledge of compressive membrane action, it is possible to design slabs in building and bridge decks economically with less than normal reinforcement. The processes involved in the development of ANN model such as the creation of a database of test results from previous research studies, the selection of architecture of the network from extensive trial and error procedure, and the training and performance validation of the model are presented. The ANN model was found to predict accurately the ultimate strength of fully restrained RC slabs. The model also was able to incorporate strength enhancement of RC slabs due to membrane action as confirmed from a comparative study of experimental and yield line-based predictions. Practical applications of the developed ANN model in the design process of RC slabs are also highlighted.

• Geomechanics and Engineering
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• 제6권1호
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• pp.17-31
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• 2014

This paper investigates the development of failure surfaces induced by an embankment on soft marine clay deposits and the characteristics of such surfaces through numerical simulations and its comparative study with monitoring results. It is well known that the factor of safety of embankment slopes is closely related to the vertical loading, including the height of the embankment. That is, an increase in the embankment height reduces the factor of safety. However, few studies have examined the relationship between the lateral movement of soft soil beneath the embankment and the factor of safety. In addition, no study has investigated the distribution of the pore pressure coefficient B value along the failure surface. This paper conducts a continuum analysis using finite difference methods to characterize the development of failure surfaces during embankment construction on soft marine clay deposits. The results of the continuum analysis for failure surfaces, stress, displacement, and the factor of safety can be used for the management of embankment construction. In failure mechanism, it has been validated that a large shear displacement causes change of stress and pore pressure along the failure surface. In addition, the pore pressure coefficient B value decreases along the failure surface as the embankment height increases. This means that the rate of change in stress is higher than that in pore pressure.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
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• pp.1441-1446
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• 2009

Numerical analysis is a powerful method in evaluating the soil-pile-structure interaction under the dynamic loading, and this approach has been applied to the practical area due to the development of computer technology. Finite Difference Method, one of the most popular numerical methods, is sensitive to the shape and the number of mesh. However, the trial and error approach is conducted to obtain the accurate results and the reasonable simulation time because of the lack of researches about mesh size and the number. In this study, FLAC 3D v3.1 program(FDM) is used to simulate the dynamic pile model tests, and the numerical results are compared with the 1G shaking table tests results. With the different size and shape of mesh, the responses of pile behavior and the simulation time are estimated, and the optimum mesh sizes in dynamic analysis of single pile is studied.

• 한국중재학회지:중재연구
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• 제16권3호
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• pp.127-160
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• 2006

Civil lawsuits have been the main instruments to resolve any civil disputes until recent times but it has its limitations in resolving all disputes in the specialized and technical disputes only according to the civil trial process. Therefore, many countries have carried out a series of discussions and investigations into the system of Alternate Dispute Resolution(ADR). It should especially be noted that all related countries in the world have enacted a basic ADR law to accelerate the usage of the ADR system. The most representative cases are the American Alternative Dispute Resolution Act of 1998 and Japan's Alternative Dispute Resolution Promotion Law set up in December 2004. As such, there is a need for Korea to enact a basic law regarding ADR following the world trend of major nations. This paper looks closely not only into the enactment circumstances and contents of Japan's ADR law whose legal system is similar to that of Korea but also the aftermath discussions of the Japanese academic circles into consideration, in the hopes of providing reference data for the legislation of the Korean ADR system and further aiding in the development of the ADR law theory.

• Structural Engineering and Mechanics
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• 제54권6호
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• pp.1097-1109
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• 2015

A novel optimization approach for reinforced concrete (RC) biaxially loaded columns is proposed. Since there are several design constraints and influences, a new computation methodology using iterative analyses for several stages is proposed. In the proposed methodology random iterations are combined with music inspired metaheuristic algorithm called harmony search by modifying the classical rules of the employed algorithm for the problem. Differently from previous approaches, a detailed and practical optimum reinforcement design is done in addition to optimization of dimensions. The main objective of the optimization is the total material cost and the optimization is important for RC members since steel and concrete are very different materials in cost and properties. The methodology was applied for 12 cases of flexural moment combinations. Also, the optimum results are found by using 3 different axial forces for all cases. According to the results, the proposed method is effective to find a detailed optimum result with different number of bars and various sizes which can be only found by 2000 trial of an engineer. Thus, the cost economy is provided by using optimum bars with different sizes.

• Advances in concrete construction
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• 제11권1호
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• pp.19-32
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• 2021

In the present experimental study, the high performance hybrid fiber reinforced concrete (HPHFRC) is prepared using the Modified Andreasen and Andersen (A&A) particle packing model. Total of 16 trial mixes of HPHFRC with Indian standard sand (SS) and natural river sand (NS) are prepared to achieve the selection criteria (flow percent>150 and compressive strength>80 MPa). Based on the flow percent and compressive strength criteria, the selected mixes evaluated to study the effect of usage of natural river sand (NS) and the expensive Indian standard sand (SS) on the mechanical, durability, and microstructure property of designed HPHFRC. It has been found that the Modified A&A model is reliable to design the mix for HPHFRC with excellent mechanical, durability, and microstructure properties. In addition to that, a moderate difference in the mechanical and durability properties of NS contained HPHFRC and SS contained HPHFRC is found. Based on the obtained results of NS contained HPHFRC, it can be concluded that the use of natural river sand (NS) can be successfully adopted for the production of HPHFRC, resulted in a reduction of the production cost without compromising the excellent performance of HPHFRC.