• Title/Summary/Keyword: 앵커시스템

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Shear Fracture Behavior of Anchor Systems for Shock Transmission Unit in RC Bridge (철근콘크리트 교량의 충격전달장치 앵커시스템의 전단파괴거동)

  • 김태상;송하원;변근주;안창모
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.11a
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    • pp.1097-1102
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    • 2001
  • Seismic safety of continuous span concrete bridge can be enhanced by distributing a large seismic lateral load to each supporting pier. A new viscoelastic device called Shock Transmission Unit(STU), which is a simple cylinder-piston assembly packed with a so-called silicone putty compound, enables the lateral seismic load to be transmitted to the pier by installation of the device to movable bearings of the bridge. The seismic safety of concrete bridges having the STU depends on not only safety of the bridges globally but also safety of anchor systems which anchors the STU to concrete pier. An experimental investigation is performed to study the behavior of cast-in-place anchor and post-installed anchor subjected to shear load statically and cyclically according to different edge distance, embedment length, and anchor spacing. Finally, the experimental results are compared with results by design methods of ACI and CCD, and results by FEM analysis.

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Fracture Behavior of Concrete Anchorage Zone of Anchor System subjected to Shear Load (전단하중을 받는 앵커시스템 정착부 콘크리트의 파괴 거동)

  • 손지웅;송하원;변근주
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.05a
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    • pp.265-270
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    • 2002
  • In this paper, structural behaviors of anchor systems subjected to shear loads are analyzed by using fracture analysis and experiments. Two dimensional finite element analyses of concrete anchor systems to predict breakout failure of concrete through progressive fracture are carried out by utilizing the so-called embedded crack model. Three dimensional finite element analyses are also carried out to investigate the fracture behavior of anchor systems having different effective lengths, edge distances, spacings between anchors, and direction of loads. Results of analyses are compared with both experimental results and design values of ACI code on anchor, and then applicability of finite element method for predicting fracture behavior of concrete anchor systems is verified.

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Fracture Behavior of Cast-in-place Headed Anchors to Concrete (콘크리트 CIP 앵커시스템의 파괴거동에 관한 연구)

  • 박성균;김호섭;윤영수;김상윤
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.04a
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    • pp.491-496
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    • 2000
  • This paper presents the evaluation of behavior and the prediction of tensile capacity of anchors that fail concrete, as the design basis for anchorage. Tests of cast-in-place headed anchors, domestically manufactured and installed in uncracked, unreinforced concrete are performed to investigate the behavior of single anchors and multiple anchors with the consideration of various embedment lengths and edge distances. The failure mode and the load-deformation response of these anchors are discussed and the concrete failure dta are then compared with capacity predictions by the two existing methods : the 45 degree cone method of ACI 349, 318 and the concrete capacity design (CCD) method. Discrepancies between the test results and these two prediction methods, FEM analysis are assessed.

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Fracture behavior of Cast-in-place Headed Anchors to Concrete (콘크리트 CIP 앵커시스템의 파괴 거동에 관한 연구)

  • Park, Sung-Gyun;Kim, Ho-Seop;Yoon, Young-Soo
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.5 no.3
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    • pp.141-152
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    • 2001
  • This paper presents the evaluation of behavior and the prediction of tensile capacity of anchors that can cause a failure of the concrete on the basis of the design for anchorage. Tests of cast-in-place headed anchors, domestically manufactured and installed in uncracked and unreinforced concrete member are conducted to test the effected of embedment length and edge distance. The failure modes and the load-deformation responses of the anchors are discussed and then the concrete failure data are compared with capacities by the two present methods : the 45 degree cone method of ACI 349, 318 and the concrete capacity design (COD) method. Differences between the results by test and by two prediction methods are analyzed Finite Element Method (FEM).

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English-Korean Cross-lingual Link Discovery Using Link Probability and Named Entity Recognition (링크확률과 개체명 인식을 이용한 영-한 교차언어 링크 탐색)

  • Kang, Shin-Jae
    • Journal of the Korean Institute of Intelligent Systems
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    • v.23 no.3
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    • pp.191-195
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    • 2013
  • This paper proposes an automatic method for discovering cross-lingual links from English Wikipedia documents to Korean ones in order to increase connectivity among vast web resources. Compared to the existing methods roughly estimating link probability of phrases, candidate anchors are selected from English documents by using various information such as title lists and linking probability extracted from Wikipedia dumps and the results of named-entity recognition, and the anchors are translated into Korean words, and then the most suitable Korean documents with the words are selected as cross-lingual links. The experimental results showed 0.375 of MAP.

Robust Motorbike License Plate Detection and Recognition using Image Warping based on YOLOv2 (YOLOv2 기반의 영상 워핑을 이용한 강인한 오토바이 번호판 검출 및 인식)

  • Dang, Xuan Truong;Kim, Eung Tae
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2019.06a
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    • pp.17-20
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    • 2019
  • 번호판 자동인식 (ALPR: Automatic License Plate Recognition)은 지능형 교통시스템 및 비디오 감시 시스템 등 많은 응용 분야에서 필요한 기술이다. 대부분의 연구는 자동차를 대상으로 번호판 감지 및 인식을 연구하였고, 오토바이를 대상으로 번호판 감지 및 인식은 매우 적은 편이다. 자동차의 경우 번호판이 차량의 전방 또는 후방 중앙에 위치하며 번호판의 뒷배경은 주로 단색으로 덜 복잡한 편이다. 그러나 오토바이의 경우 킥 스탠드를 이용하여 세우기 때문에 주차할 때 오토바이는 다양한 각도로 기울어져 있으므로 번호판의 글자 및 숫자 인식하는 과정이 훨씬 더 복잡하다. 본 논문에서는 다양한 각도로 주차된 오토바이 데이트세트에 대하여 번호판의 문자 인식 정확도를 높이기 위하여 2-스테이지 YOLOv2 알고리즘을 사용하여 오토바이 영역을 선 검출 후 번호판 영역을 검지한다. 인식률을 높이기 위해 앵커박스의 사이즈와 개수를 오토바이 특성에 맞추어 조절하였다. 그 후 기울어진 번호판을 검출한 후 영상 워핑(Image Warping) 알고리즘을 적용하였다. 모의실험 결과, 기존 방식의 인식률이 47,74%에 비해 제안된 방식은 80.23%의 번호판의 인식률을 얻었다. 제안된 방법은 전체적으로 오토바이 번호판 특성에 맞는 앵커박스와 이미지 워핑을 통해서 다양한 기울기의 오토바이 번호판 문자 인식을 높일 수 있었다.

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Evaluation of Vibration Characteristics of Operating Rotational Machines Depending of Types of Foundation (기초형식에 따른 회전기기의 가동중 진동특성 분석)

  • Kim, Min-Kyu;Choun, Young-Sun
    • Journal of the Earthquake Engineering Society of Korea
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    • v.11 no.3 s.55
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    • pp.63-72
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    • 2007
  • The Emergency Diesel Generator (EDG) is a very important equipment for the safety of a Nuclear Power Plant (NPP). In this study, the operating vibration of three kinds of EDG systems was measured. The target EDG systems are Yonggwang 5 unit and Ulchin 2 and 3 units. The Yonggwang 5 and Ulchin 3 unit EDG systems are the same type but the foundation systems are different. One is an anchor bolt type and the other is a spring and viscous-damper type. The purpose of these measurements is for a verification of the vibration isolation effect depending on the foundation system. As a result, It can be said that the spring and viscous damper system of the EDG performed better for the vibration isolation than that of anchor bolt type.

Development of a Computer Program to Analyze Stability of Slopes Reinforced by the Earth Retention System (활동억지시스템으로 보강된 사면의 안정해석 프로그램 개발)

  • Hong Won-Pyo;Song Young-Suk
    • The Journal of Engineering Geology
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    • v.16 no.1 s.47
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    • pp.45-58
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    • 2006
  • A new computer program SLOPILE(Ver 3.0) is developed to analyze stability of slopes containing an earth retention system composing of piles, nails and anchors. SLOPILE(Ver 3.0) can calculate the slope stability for both planar failure surfaces in infinite slopes and arc failure surfaces. In order to investigate a design adaptability of SLOPILE(Ver 3.0), analysis results of TALREN and SLOPE/W programs are compared with that of SLOPILE(Ver 3.0). SLOPILE(Ver 3.0) can calculate the slopes reinforced by earth retention system such as piles, nails and anchors. But, TALREN and SLOPE/W can not calculate the slope reinforced by piles. As a analysis result of the example case, SLOPILE(Ver 3.0) is accuracy and suitable program for the stability analysis of slopes reinforced by earth retention system. Therefore, SLOPILE(Ver 3.0) is the most suitable program to analyze the slope reinforced by the earth retention system.

A Robust Real-Time License Plate Recognition System Using Anchor-Free Method and Convolutional Neural Network

  • Kim, Dae-Hoon;Kim, Do-Hyeon;Lee, Dong-Hoon;Kim, Yoon
    • Journal of the Korea Society of Computer and Information
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    • v.27 no.4
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    • pp.19-26
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    • 2022
  • With the recent development of intelligent transportation systems, car license plate recognition systems are being used in various fields. Such systems need to guarantee real-time performance to recognize the license plate of a driving car. Also, they should keep a high recognition rate even in problematic situations such as small license plates in low-resolution and unclear image due to distortion. In this paper, we propose a real-time car license plate recognition system that improved processing speed using object detection algorithm based on anchor-free method and text recognition algorithm based on Convolutional Neural Network(CNN). In addition, we used Spatial Transformer Network to increase the recognition rate on the low resolution or distorted images. We confirm that the proposed system is faster than previously existing car license plate recognition systems and maintains a high recognition rate in a variety of environment and quality images because the proposed system's recognition rate is 93.769% and the processing speed per image is about 0.006 seconds.

The application of Dynamic Positioning System to Maritime Autonomous Surface Ship(MASS)

  • Jeong-Min, Ki;Hye Ri, Park
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2022.11a
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    • pp.164-165
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    • 2022
  • 자율운항선박(Maritime Autonomous Surface Ship)의 개발과 도입은 해양 분야의 4차 산업 시대를 이끄는 가장 중요한 기술과 변화이다. 자율운항선박은 해양 사고의 발생 원인 중 가장 높은 비중을 차지하는 인적 요소를 줄이기 위해 인간의 개입 없이 독립적으로 운항하는 선박을 일컫는다. 인간의 개입을 줄이기 위해서는 기존의 선박과 다른 개념과 기술을 개발하고 도입해야 한다. 수십 년 전 개발되어 해상 플랫폼 및 오프쇼어 분야에서 특정 용도로 사용되는 선박 시스템인 동적위치제어스템은 기존의 시스템에 더해 더욱 정교하고 섬세한 선박의 움직임이 가능하도록 다양한 기능을 제공한다. 최근의 영국에서 제출한 IMO 의제 문서에 의하면, 자율운항선박에는 전통적인 앵커와 같은 선박 설비에 더해 추가로 다른 기술이 적용될 수 있다고 밝히며, 동적위치제어시스템을 명시하였다. 본 논문에서는 이러한 기능 중 자율운항선박의 안전한 운항을 달성하기 위해 동적위치제어시스템에서 적용할 수 있는 요인을 알아보고 제시하고자 한다.

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