• 한국재난정보학회 논문집
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• 제17권1호
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• pp.39-52
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• 2021

연구목적: 최근 시설물 점검 및 진단에 있어 활용되는 첨단장비들이 증가하여 첨단장비의 검·인증제도의 필요성이 대두되고 있다. 본 연구는 시설물 점검 및 진단에 활용되는 터널스캐너의 성능검증 방법론을 제시하는 것을 목적으로 한다. 연구방법: 시설물 점검 및 진단에 활용되는 첨단장비의 성능검증 사례를 조사하고 전문가 자문회의를 통해 터널스캐너 성능검증 방법론을 제시하였다. 연구결과: 본 연구에서 제안하는 터널스캐너 성능검증 방법론은 1차 평가와 2차 평가로 구성된다. 1차 평가지표는 최소요구성능을 기준으로 구성되고, 2차 평가지표는 터널스캐너의 품질에 관여된 지표들로 구성된다. 결론: 본 연구에서 제시한 터널스캐너의 성능검증 방법론은 장비 사용자에게 공인된 성능 카탈로그를 제공할 수 있으며, 장비 개발자는 장비의 공인된 검증을 받을 수 있어 부실한 유지관리를 예방할 수 있을 것으로 기대된다.

• 한국항공운항학회지
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• 제19권4호
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• pp.24-29
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• 2011

Conceptual study of an open-circuit type low-speed wind tunnel for performance test of wind turbine blade and airfoil is conducted. The tunnel is constituted of a settling chamber, a contraction, closed test section, a diffuser, two corners, a cross leg and a fan and motor. For the performance test, the closed test section width of 1.8 m, height of 1.8 m and length of 5.25 m is selected. The contraction ratio is 9 to 1 and maximum speed in the test section is 67 m/sec. Input power in the tunnel is about 238 kW and its energy ratio is 3.6. The wind tunnel designed in present study will be an effective tool in research and development of wind turbine and airfoil.

• 복합신소재구조학회 논문집
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• 제7권1호
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• pp.1-8
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• 2016

In this paper, the full-size structural performance test for a lightweight soundproof tunnel composed of partitioned pipe truss members is carried out to investigate the structural performance. In addition, a nonlinear structural analysis of the same finite element model as the full-size testing model is performed to compare the test result. The test and analysis results showed that the lightweight soundproof tunnel ensures the structural safety against wind loads, snow loads and load combinations. As a result, the full-size test and analysis results meet all the design load conditions, hence the proposed lightweight soundproof tunnel is ready for the field application.

• Geomechanics and Engineering
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• 제18권4호
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• pp.373-389
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• 2019

It is important to study the problem of durability for tunnel structures. As a main influence on the durability of tunnel structures, carbonation-induced corrosion is studied. For the complicated environment of tunnel structures, based on the data samples from real engineering examples, the intelligent method (genetic programming) is used to construct the service life prediction model of tunnel structures. Based on the model, the prediction of service life for tunnel structures in carbonation environments is studied. Using the data samples from some tunnel engineering examples in China under carbonation environment, the proposed method is verified. In addition, the performance of the proposed prediction model is compared with that of the artificial neural network method. Finally, the effect of two main controlling parameters, the population size and sample size, on the performance of the prediction model by genetic programming is analyzed in detail.

• Computers and Concrete
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• 제32권1호
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• pp.15-26
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• 2023

In order to study the anti-seismic performance of full light-weight concrete utility tunnel, EL Centro seismic waves were input, and the seismic simulation shaking table test was carried out on the four utility tunnel models. The dynamic characteristics and acceleration response of the system consisting of the utility tunnel structure and the soil, and the interlayer displacement response of the structure were analyzed. The influence law of different construction methods, haunch heights and concrete types on the dynamic response of the utility tunnel structure was studied. And the experimental results were compared with the finite element calculation results. The results indicated that with the increase of seismic wave intensity, the natural frequency of the utility tunnel structure system decreased and the damping ratio increased. The assembling composite construction method could be equivalent to replace the integral cast-in-place construction method. The haunch height of the assembling composite full light-weight concrete utility tunnel was increased from 30 mm to 50 mm to enhance the anti-seismic performance during large earthquakes. The anti-seismic performance of the full light-weight concrete utility tunnel was better than that of the ordinary concrete utility tunnel. The peak acceleration of the structure was reduced by 21.8% and the interlayer displacement was reduced by 45.8% by using full light-weight concrete. The finite element simulation results were in good agreement with the experimental results, which could provide reference for practical engineering design and application.

• 태양에너지
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• 제20권2호
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• pp.67-73
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• 2000

This study represents the methodology of performance prediction for small hydro power(SHP) sites. Nine tunnel type SHP sites with diversion dam were selected and the performance characteristics were analyzed by using a developed model. Also, primary design specifications such as design flowrate, plant capacity, and operational rate were suggested and feasibility for tunnel-type SHP sites were estimated. It was found that the design flowrate was most important parameter to exploit SHP plant and the methodology developed in this study was useful tool to analyze the performance of SHP sites.

• 한국철도학회논문집
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• 제8권1호
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• pp.51-56
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• 2005

A dynamic simulation program of a catenary-pantograph system including tunnel section and transient section is developed in this study. The simulation program can accommodate for the pantograph of two panheads and three d.o.f model. Using the developed program, the dynamic characteristics with a SCHUNK'S WBL 85-PANTOGRAPH are analyzed at the conventional TAEBAEK line and its tunnel section when the catenary system is supported by a tunnel bracket. The simulation results show that the variation of contact force md uplift displacement is allowable in general section and the entrance and exit of a tunnel, but the uplift displacement and the separation ratio within tunnel section is difficult to allow.

• Computers and Concrete
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• 제21권4호
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• pp.399-406
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• 2018

The present study focuses on the performance of basalt fiber reinforced concrete (BFRC) lining in tunnel situated in sandstone rock when subjected to internal blast loading. The blast analysis of the lined tunnel is carried out using the three-dimensional (3-D) nonlinear finite element (FE) method. The stress-strain response of the sandstone rock is simulated using a crushable plasticity model which can simulate the brittle behavior of rock and that of BFRC lining is analyzed using a damaged plasticity model for concrete capturing damage response. The strain rate dependent material properties of BFRC are collected from the literature and that of rock are taken from the authors' previous work using split Hopkinson pressure bar (SHPB). The constitutive model performance is validated through the FE simulation of SHPB test and the comparison of simulation results with the experimental data. Further, blast loading in the tunnel is simulated for 10 kg and 50 kg Trinitrotoluene (TNT) charge weights using the equivalent pressure-time curves obtained through hydrocode simulations. The analysis results are studied for the stress and displacement response of rock and tunnel lining. Blast performance of BFRC lining is compared with that of plain concrete (PC) and steel fiber reinforced concrete (SFRC) lining materials. It is observed that the BFRC lining exhibits almost 65% lesser displacement as compared to PC and 30% lesser displacement as compared to SFRC tunnel linings.

• 한국항공우주학회지
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• 제34권9호
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• pp.20-24
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• 2006

기본적인 십자형 낙하산과 새롭게 고안된 십자형 낙하산의 활강 및 회전 성능을 풍동실험을 통해 정성적으로 비교하여 보았다. 실험 비교 결과 새로이 고안된 낙하산의 활강 성능은 기본 십자형보다 좋았으나 회전 성능은 보다 떨어졌다.

• 한국터널지하공간학회 논문집
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• 제25권4호
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• pp.331-344
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• 2023

본 논문은 일본의 성능평가 제도인 NETIS의 사후평가와 점검 지원 기술 성능 카탈로그를 통해 기존 터널 스캐닝 시스템의 성능을 분석하였다. 분석을 통해 터널 스캐닝 시스템의 개선 사항과 개발 방향에 대한 시사점을 도출하였다. 일본의 신기술은 사용자 중심의 정보 제공을 우선시하여 NETIS의 사후평가와 점검 지원 기술 성능 카탈로그의 표준시험방법을 통해 다양한 터널 스캐닝 시스템의 특성을 객관적으로 비교하고 분석할 수 있다. 국내의 건설신기술은 기술인증의 공급자 중심으로 터널 스캐닝 시스템에 대한 객관적인 성능 비교는 불가능하였다. 일본의 터널 스캐닝 시스템의 핵심장치인 카메라의 제원을 비교하여 성능을 간접적으로 비교 평가하였다. 향후 터널 스캐닝 시스템 개발을 위해서는 카메라의 고해상도와 빠른 노출 성능 그리고 이에 부합되는 고휘도의 조명 장치가 요구된다. 실내에서 카메라와 조명의 성능을 분석할 수 있는 실험 환경 조성도 필요할 것으로 판단된다.