• Title/Summary/Keyword: Civil Society

Search Result 18,071, Processing Time 0.042 seconds

Computer vision and deep learning-based post-earthquake intelligent assessment of engineering structures: Technological status and challenges

  • T. Jin;X.W. Ye;W.M. Que;S.Y. Ma
    • Smart Structures and Systems
    • /
    • v.31 no.4
    • /
    • pp.311-323
    • /
    • 2023
  • Ever since ancient times, earthquakes have been a major threat to the civil infrastructures and the safety of human beings. The majority of casualties in earthquake disasters are caused by the damaged civil infrastructures but not by the earthquake itself. Therefore, the efficient and accurate post-earthquake assessment of the conditions of structural damage has been an urgent need for human society. Traditional ways for post-earthquake structural assessment rely heavily on field investigation by experienced experts, yet, it is inevitably subjective and inefficient. Structural response data are also applied to assess the damage; however, it requires mounted sensor networks in advance and it is not intuitional. As many types of damaged states of structures are visible, computer vision-based post-earthquake structural assessment has attracted great attention among the engineers and scholars. With the development of image acquisition sensors, computing resources and deep learning algorithms, deep learning-based post-earthquake structural assessment has gradually shown potential in dealing with image acquisition and processing tasks. This paper comprehensively reviews the state-of-the-art studies of deep learning-based post-earthquake structural assessment in recent years. The conventional way of image processing and machine learning-based structural assessment are presented briefly. The workflow of the methodology for computer vision and deep learning-based post-earthquake structural assessment was introduced. Then, applications of assessment for multiple civil infrastructures are presented in detail. Finally, the challenges of current studies are summarized for reference in future works to improve the efficiency, robustness and accuracy in this field.

Development of Defect-Repair Method-Cost Mapping Algorithm of Concrete Bridge Using BMS Data (BMS 데이터를 활용한 콘크리트 교량의 결함-공법-비용 매핑 알고리즘 개발)

  • Lee, Changjun;Park, Wonyoung;Cha, Yongwoon;Jang, Young-Hoon;Park, Taeil
    • KSCE Journal of Civil and Environmental Engineering Research
    • /
    • v.43 no.2
    • /
    • pp.267-275
    • /
    • 2023
  • As aged infrastructures have been increased, the importance of accurate maintenance costs and proper budget allocation for infrastructure become prominent under limited resources. This study proposed a mapping algorithm between representative defects, repair methods, and the estimated maintenance costs for concrete bridges. In this regard, using BMS (Bridge Management System) data analysis, bridge repair methods were classified and matched with defects according to their locations, types, and sizes. In addition, the maintenance costs were estimated based on the amount of work-load and quantity per unit using CSPR (Cost Standard Production Rate). As a result, the level of accuracy was an average of 85.1 % compared with the actual bill of quantity for Seoul bridge maintenance. The accuracy of maintenance costs is expected to be enhanced by considering the various site conditions such as pier height, extra charge conditions, additional equipment, etc.

Enhanced Capability of Drain in Soft Clays from PVDF Film (PVDF 필름을 이용한 연약점토지반의 배수능력의 향상)

  • Park, Ji-Ho;Lee, Sung-Jin;Jun, Young-Woo;Kim, Young-Uk
    • Proceedings of the KAIS Fall Conference
    • /
    • 2010.11a
    • /
    • pp.451-453
    • /
    • 2010
  • PVDF(polyvinylidene fluoride) 필름은 압전특성을 가지며 음파에너지를 발생시키는 유연성 고분자필름이다. 이 연구에서는 기존 원통형 연직 배수재에 PVDF 필름의 음파에너지를 적용하여 점토의 미세입자가 배수재의 성능을 저하시키는 막힘현상(clogging)을 방지함으로써 배수재의 성능을 향상시키고, 압밀을 촉진시키고자 하였다.

  • PDF

Development and Application of an Energy Input-Output Table for an Energy Demand and Supply Activities Analysis

  • Pruitichaiwiboon, Phirada;Lee, Cheul-Kyu;Baek, Chun-Youl;Lee, Kun-Mo
    • Environmental Engineering Research
    • /
    • v.16 no.1
    • /
    • pp.19-27
    • /
    • 2011
  • This paper introduces an approach to identify the total energy consumption with subsequent $CO_2$ emissions, for both industrial and non-industrial sectors. Statistical data for 2005 were compiled in a national account system to construct an energy input-output table for investigating the influence between energy demand and supply activities. The methodological approach was applied to South Korea. Twelve types of energy and fifteen industrial and non-industrial sectors are formed as the compartments of the input-output table. The results provided quantitative details of the energy consumption and identified the significant contributions from each sector. An impact analysis on the $CO_2$ emissions for the demand side was also conducted for comparison with the supply side.

Development of Drainage Asphalt Mixture Using Large Size Aggregate and Its Performance on Test Pavement

  • Ogino Shoji;Ohmae Tatsuhiko;Matsumoto Yuki;Yamada Masaru
    • International Journal of Highway Engineering
    • /
    • v.8 no.1 s.27
    • /
    • pp.107-117
    • /
    • 2006
  • Recently, there has been a remarkable trend of using aggregates at sizes smaller than 13 mm for drainage asphalt pavement (DAP) in order to reduce the noise generated between vehicle tires and road surface. These DAPs have their performance and durability seriously worsen after several years in-service due to the clogging of void space and the abrasion. This paper proposes the use of large size aggregates in porous asphalt mixtures to overcome these defects. Results of laboratory and field experiments on asphalt mixtures with several aggregate gradations are investigated and compared. The study focuses on advantages of DAP using large size aggregate and on particle size combinations containing no fine aggregates of size 2.36 mm or less, which have not been considered in current engineering practice.

  • PDF

Development of Light-Weight Pavement System for Green-Space Construction (녹색공간 조성을 위한 경량포장용 시스템 기술 개발)

  • Lee, Kwan-Ho;Ham, Sang-Min;Choi, Jae-Jin;Song, Yong-Sun;Cho, Kook-Hwan
    • Proceedings of the KAIS Fall Conference
    • /
    • 2009.12a
    • /
    • pp.346-349
    • /
    • 2009
  • 본 연구는 충청권 연안역의 아름다운 자연과 이를 관광자원화 할 수 있는 연안역 녹색공간조성을 위한 해안도로 기반 시설로서 연안역의 지형 및 기후조건을 고려한 해안도로시스템 기술을 개발하는 것이다. 이를 위해 해안경관을 고려한 도로계획기술, 연안기후 지형 및 기후에 강한 해안도로 경량포장시스템 등이 포함된다. 이러한 계획, 설계 및 시공, 유지관리 시스템 기술 개발 및 효율적인 구축을 통해 녹색성장의 연안역 개발 프로토타입을 구축하며 이를 통해 국토의 효율적 운영, 삶의 질 개선, 그리고 미래 신성장 동력 창출에 기여하고자 한다.

  • PDF

A Study on Standard Specifications for Coastal Safety Facilities (연안 및 다양한 안전시설 설계기준에 대한 고찰)

  • Kang, Hyo-Gi;Park, Jong-Sub;Kim, Dae-Kyu;Yoon, Ki-Yong
    • Proceedings of the KAIS Fall Conference
    • /
    • 2009.12a
    • /
    • pp.350-353
    • /
    • 2009
  • 본 연구는 서해안 특성에 적합한 연안역 안전시설 설계기준을 마련을 위해 국내 외 도로, 해안, 항만 구조물의 안전시설기준을 비교, 분석, 정리하였다. 검토된 설계기준은 항만시설물의 안전시설 설계지침,항만 및 어항설계기준, 조경 설계기준, 도로부대시설, 도로교 설계기준, 미국 FHWA DSTA, 그리고 미국 FHWA PFG을 검토하였다. 검토결과 국내의 연안역 안전시설 설계기준 및 적용이 미흡한 상황에 있으며 설계외력산정 및 평가에 적절한 보정계수 및 관련 상세설계기준 마련이 시급한 것으로 판단된다.

  • PDF

Absorption Characteristic of Physical sorbent in the High $CO_2$ pressure (고압$CO_2$조건에서 물리흡수제의 흡수특성)

  • Baek, Geun-Ho;Lee, Ji-Yun;Choi, Hee-Young;Pak, Soo-Jin;Jang, Hyun-Tae;Cha, Wang-Seog
    • Proceedings of the KAIS Fall Conference
    • /
    • 2009.12a
    • /
    • pp.1038-1041
    • /
    • 2009
  • 본 논문에서는 온실가스인 이산화탄소를 연소전 조건에서 회수하기 위해 DMSO, Sulfolane, PEG를 이용하여 이산화탄소 흡수특성을 조사하였다. 회분식 기-액 평형반응기를 이용하여 고정압력에서 온도변화에 따른 용해도와 재생성, 초기흡수속도를 측정하였다. 실험결과 용해도의 경우 PEG가 뛰어났으며 초기흡수속도의 경우 DMSO가 우수하였다.

  • PDF

Research and Development Plan of Safety Facilities in the Coastal Zone (연안역 안전시설 관련 연구 및 개발추진계획)

  • Lim, Nam-Hyoung;Lee, Chin-Ok;Sung, Ik-Hyun;Jang, Sun-Jae
    • Proceedings of the KAIS Fall Conference
    • /
    • 2009.12a
    • /
    • pp.339-341
    • /
    • 2009
  • 연안역에 대한 관심이 고조되면서 연안역을 따라 많은 산업화와 관광권화가 진행되고 있으나 안전시설에 대한 무관심으로 인해 많은 인적 및 물적 피해가 속출하고 있다. 충청권 연안역이 가지고 있는 지역적(관광, 산업, 방조제 등) 및 자연적(조수, 해일, 지진, 해양기름유출, 해안습지, 태풍 등) 특성을 고려한 연안역 안전시설을 개발하고자 연구를 수행하고 있다. 선행연구로 서해안 연안역 현장조사를 통한 안전시설물의 설치 현황을 살펴보고 이를 분석하였으며, 이를 통해 연안역 안전시설의 성능 및 설계기준, 건설재료 등에 대한 연구를 기획하였다. 연구과제의 최종 수행결과물로서 제시될 해안 안전 시설물 계획 설계 시공 유지관리에 대한 개발추진계획을 제시한다.

  • PDF

The Application Method for restoration of the spring water areas using the Scoria (용천수 주변지역 원형 복원을 위한 송이 활용기법)

  • Ko, Ho-Jun;Ko, Myeong-Jin;Lee, Chang-Hun;Hwang, Ha-Neul;Choe, Na-Yeol;Kim, Nam-Heong
    • Proceedings of the KAIS Fall Conference
    • /
    • 2010.11b
    • /
    • pp.576-578
    • /
    • 2010
  • 현재 제주도의 주 수입원이 관광과 수자원이 되어감에 따라 용천수의 중요성이 부각되고 있다. 그러나 용천수의 관리에 문제가 발생하고 있어 이번 논문에서는 용천수 주변지역 원형 복원을 위한 송이 활용기법을 주제로 삼고 있으며 이번 실험을 통해 용천수 관리의 방안을 제시해 보고자 한다.

  • PDF