• 한국재난정보학회 논문집
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• 제19권3호
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• pp.689-697
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• 2023

연구목적: 본 연구는 미니트렌칭 공법 적용 과정에서 범용 스마트폰을 이용하여 지중매설물의 정보를 자동 추출하는데 목적이 있다. 연구방법:이미지 학습을 위한 데이터 셋은 주야간, 높이, 각도 등의 다양한 조건에서 수집하였으며, 객체 검지알고리즘은 R-CNN 알고리즘을 이용하였다. 연구결과: 성능평가지표는 정확한 예측과 재현율의 평균을 동시에 고려할 수 있는 F1-Score를 적용하였으며, 학습결과 F1-Score는 0.76으로 나타났다. 결론: 본 연구의 결과는 스마트폰 기반의 지중매설물 정보 추출이 가능한 것으로 나타났으나, 학습데이터의 추가적인 확보와 현장 실증 등을 통해 알고리즘의 정밀성 및 정확성을 향상시킬 필요가 있을 것으로 판단된다.

• 터널과지하공간
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• 제10권3호
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• pp.481-485
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• 2000

지반진동을 차단하기 위한 방법으로 방진구가 효과적이지만 대부분의 구조물은 암반 위에 건설되어 있으므로 방진구를 설치하여 진동전파경로를 차단하는 것은 무리가 된다. 그러므로 천공기를 이용하여 방진공을 형성하여 발파진동을 차단하려는 사례가 늘어나고 있는 실정이다. 본 연구에서 2차원 지반모델에 설치된 방진공의 발파진동차단효과를 수치 해석적으로 분석하기 위해 이산요소해석프로그램 (UDEC)을 이용하여 동적 해석을 수행하였으며 이와 비슷한 조건으로 현장실험에 적용하였다.

• 한국암반공학회:학술대회논문집
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• 한국암반공학회 2000년도 암반공학문제의 수치해석(Numerical Analysis in Rock Engineering Problems)
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• pp.235-239
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• 2000

지반진동을 차단하기 위한 방법으로 방진구가 효과적이지만 대부분의 구조물은 암반 위에 건설되어 있으므로 방진구를 설치하여 진동전파경로를 차단하는 것은 무리가 된다. 그러므로 천공기를 이용하여 방진공을 형성하여 발파진동을 차단하려는 사례가 늘어나고 있는 실정이다. 본 연구에서 2차원 지반모델에 설치된 방진공의 발파진동차단효과를 수치해석적으로 분석하기 위해 이산요소해석프로그램(UDEC)을 이용하여 동적해석을 수행하였으며 이와 비슷한 조건으로 현장실험에 적용하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 봄 학술발표회 논문집
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• pp.591-596
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• 2001

The purpose of this paper Is to present and discuss some of evaporation and desiccation observed in laboratory experiments under controlled conditions, and is to improve PTM(Progressive Trenching Method) operating technique. PTM is the technically feasible and economically justifiable dewatering and desiccation technique for dredged material containment areas. A series of laboratory experiments with large model test were carried out to get evaporation rate and strength increase. Surface desiccation of dredged material is basically changed by evaporation characteristics which is controlled by weather and trench type, etc. This study shows that trench depth and rain fall are important factors in desiccation of dredged soft clay.

• International Journal of Naval Architecture and Ocean Engineering
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• 제8권2호
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• pp.177-187
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• 2016

To evaluate the tractive performance of tracked trencher on seafloor surface, a new shear stress-displacement empirical model was proposed for saturated soft-plastic soil (SSP model). To validate the SSP model, a test platform, where track segment shear test can be performed in seafloor soil simulacrum (bentonite water mixture), was built. Series shear tests were carried out. Test results indicate that the SSP model can describe the mechanical behavior of track segment with good approximation in seafloor soil simulacrum. Through analyzing the main external forces applied to seafloor tracked trencher during the uniform linear trenching process, a drawbar pull prediction model was deduced with the SSP model. A tracked walking mechanism of the seafloor tracked trencher prototype was built, and verification tests were carried out. Test results indicate that this prediction model was feasible and effective; moreover, from another side, this conclusion also proved that the SSP model was effective.

• 한국전기전자재료학회논문지
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• 제23권5호
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• pp.364-367
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• 2010

The dual ion-implantation trench edge termination techniques were investigated and optimized using a two-dimensional device simulator. By trenching the field ring site which would be dual implanted, a better blocking capability can be obtained. The results show that the p-n junction with dual implanted junction field-ring can accomplish nearly 20% increase of breakdown voltage in comparison with the conventional trench field-rings. The fabrication is relatively difficult. But the trench etched field ring with dual ion-implantation is surpassed for breakdown voltage and consume same area and extensive device simulations as well as qualitative analysis confirm these conclusions.

• 전기전자학회논문지
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• 제11권4호
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• pp.235-238
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• 2007

2차원 소자 시뮬레이터인 TMA 메디치를 이용하여 필드링와 깊은 접합 필드링에 대해 연구하였다. 이온 주입될 위치를 미리 트랜치 식각을 시킴으로써 항복전압 특성을 향상시킬 수 있었다. 시뮬레이션 결과 기존 필드링의 항복전압대비 깊은 접합 필드링 항복전압은 약 30%의 증가를 보였다. 깊은 접합 필드링은 같은 면적을 차지하는 조건하에서 설계 및 제작이 비교적 용이하고, 표면 전하의 영향도 적은 것으로 나타났다. 본 논문에서는 여러 분석을 통해 깊은 접합 필드링의 향상된 특성을 논하였다.

• 한국해양공학회지
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• 제29권5호
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• pp.386-391
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• 2015

The mobility of tracked vehicles is mainly influenced by the interaction between the tracks and soil. When the track of a tracked vehicle rotates, there will be a slip effect between the track and the soil, which creates a track shear force and the vehicle’s driving force. In this paper, the modeling of a working tool such as a trenching cutter and a tracked vehicle that is the lower frame of a track-based operating robot was performed. In addition, a numerical simulation was executed to verify the performance of the design objectives and the motion characteristics of the combined system.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2007년도 공동학술대회 논문집
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• pp.219-224
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• 2007

We conducted geophysical surveys to detect antitank mine at Namji-eup, Gyeongsangnam-do which had been installed during Korean war. The surveys consisted of 2 stages, at the first stage we divided the survey area into 7 block and carried out magnetic gradient survey and GEM-3 EM survey sequentially for each block. Hence we verified anomaly areas using an excavator and a metal detector. Most of anomalies were found to be garbages such as trash cans, metallic wastes, and so on. And also, the concrete pipe was found at depth of 1 m, which had not referred in any report of that area. At the second stage, after trenching the covered soil down to 75 cm the same surveys were conducted. We could not find the strong signal to be inferred from a antitank mine, but we pointed out some anomalies to need careful handling because demining is very dangerous work even though there is few possibility that is mine.

• 상하수도학회지
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• 제30권6호
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• pp.725-736
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• 2016

There is a growing concern on the improvement of water distribution pipeline for multi-regional water supply system in Korea along with its aging infrastructure. Rehabilitation of large diameter pipeline is more efficient in cost and time compared to replacement with trenching. The procedure for rehabilitation are diagnosis, cleaning, spraying coating material, and final inspection. The internal state of pipeline was carefully diagnosed and got C grade, which required rehabilitation. We found that 17,274,787,000 Korean won could be saved after pipe surface coating because of increased C coefficient of Hazen-Williams equation. Optimal coating material was D polyurea. We also found optimal distance between spraying nozzle and pipe wall to be 70 - 80 cm, which were critical factors for coating quality. This study also illustrated the time for spray drying to be more than 30 min. These results could be used in the quality control process during rehabilitation of aged pipelines.