• Advances in Computational Design
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• 제5권1호
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• pp.91-109
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• 2020

Over the past few decades, the impact of natural, manmade and natech (natural hazard triggering technological disasters) disasters has been devastating, affecting over 4.4 billion people. In spite of recent technological advances, the increasing frequency and intensity of natural disasters and the escalation of manmade threats is presenting a number of challenges that warrant immediate attention. This paper explores the integration of drones or Unmanned Aerial Vehicles (UAV's) into infrastructure monitoring and post-disaster assessment. Through reviewing some of the recent disasters, effectiveness of utilizing UAV's in different stages of disaster life cycle is demonstrated and needed steps for successful integration of UAV's in infrastructure monitoring, hazard mitigation and post-incident assessment applications are discussed. In addition, some of the challenges associated with implementing UAV's in disaster monitoring, together with research needs to overcome associated knowledge gaps, is presented.

• Smart Structures and Systems
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• 제5권4호
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• pp.357-367
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• 2009

Structural Health Monitoring (SHM), particularly remote monitoring, is an emerging field with great potential to help infrastructure owners obtain more and up-to-date knowledge of their structures. The methodology could provide supplemental information to guide the frequency and extent of visual inspections, and the possible need for maintenance. The instrumentation for a SHM system needs to be developed with longevity and the objectives for the system in mind. Sensors need to be selected for reliability and durability, sited where they provide the maximum information for the objectives, and where they can be accessed and replaced should the need arise over the monitoring period. With the rapid changes now occurring with sensors and software, flexibility needs to be in place to allow the system to be upgraded over time. Damage detection needs to be considered in terms of the type of damage that needs to be detected, informing maintenance requirements, and how detection can be achieved. Current vibration analysis techniques appear not yet to have achieved the necessary sensitivity for that purpose. Societal factors will influence the design of a SHM system in terms of the sophistication of the instrumentation and methodology employed.

• 융합보안논문지
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• 제13권6호
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• pp.61-68
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• 2013

본 논문은 동력분산식 차세대고속열차가 최고속도 400km/h 이상으로 개발됨에 따라 차량의 최고속도 시험에 대비하여 호남고속철도 건설구간에서 인프라시스템 기술개발이 필요하여 국내에서는 유일하게 현재 호남고속철도 건설구간 중 28km 구간에서 400km/h급 고속철도 인프라를 구축하였다. 또한 계측장비의 설치 및 모니터링 시스템을 설치하여 선로의 지속적인 모니터링이 가능하도록 설계하였다. 이를 통해, 보다 포괄적이며 장기적인 관점에서 통합모니터링의 요구사항과 향후 연구방향을 확인할 수 있었다.

• Smart Structures and Systems
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• 제11권4호
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• pp.331-348
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• 2013

Effective monitoring, reliable data analysis, and rational data interpretations are challenges for engineers who are specialized in bridge health monitoring. This paper demonstrates how to use the Global Positioning System (GPS) and accelerometer data to accurately extract static and quasi-static displacements of the bridge induced by ambient effects. To eliminate the disadvantages of the two separate units, based on the characteristics of the bias terms derived from the GPS and accelerometer respectively, a wavelet based multi-step filtering method by combining the merits of the continuous wavelet transform (CWT) with the discrete stationary wavelet transform (SWT) is proposed so as to address the GPS deformation monitoring application more efficiently. The field measurements are carried out on an existing suspension bridge under the normal operation without any traffic interference. Experimental results showed that the frequencies and absolute displacements of the bridge can be accurate extracted by the proposed method. The integration of GPS and accelerometer can be used as a reliable tool to characterize the dynamic behavior of large structures such as suspension bridges undergoing environmental loads.

• 정보보호학회논문지
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• 제21권6호
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• pp.67-81
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• 2011

최근 세계 각지에 국가 주요 산업시설을 목표로 하는 스턱스넷(stuxnet)과 같은 '사이버 무기'가 나타나 보안전문가들이 주목하고 있다. 도시의 교통과 지하철, 상수도 등과 같은 기반시설을 제어하는 네트워크는 전통적으로 폐쇄망으로 운영되고 있어 바이러스, 악성코드 등의 위협에 안전한 것으로 인식되어 왔으나, 이제는 새로운 공격 위협에 능동적으로 대처해야 할 때이다. 본 연구에서는 도시 기반시설 SCADA망의 제어시스템 현황과 위험을 분석하고, 운영환경에 맞는 보안 모델을 수립함으로써 이러한 위협에 대응하기 위한 방향을 제시하고자 한다.

• 한국ITS학회 논문지
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• 제22권1호
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• pp.265-275
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• 2023

본 논문의 목적은 도로 인프라의 안전성 관리를 위해 운행하는 자율주행차의 최적경로 선정 알고리즘을 제안하는 것이다. 자율주행차는 지정된 구역의 도로 네트워크의 노드-링크를 최소한 한 번 이상 주행하며 인프라 요소의 위험성을 검지하고, 다시 차고지로 복귀해야 한다. 이때 위험도가 높은 노드-링크를 우선 방문해야 한다. 본 논문에서는 위험도가 높은 노드-링크를 방문하면 높은 보상을 주는 보상 최적화 알고리즘을 제안하였다. 새로운 알고리즘의 유효성 검증을 위해 토이 네트워크를 구성하고, 중국 집배원 배달경로 알고리즘과 비교했다. 보상 최적화 알고리즘의 이동 횟수는 중국 집배원 배달경로의 이동 횟수와 같으나, 임의로 지정한 고위험 노드-링크는 보상 최적화 알고리즘에서 선 순위로 통과했다. 하지만, 본 연구의 보상 최적화 알고리즘은 단순구조의 토이 네트워크를 통해 검증하였으나, 향후 실제 도로환경과 유사한 복잡한 네트워크에서 알고리즘의 유효성을 검증해야 하는 과제가 남아 있다.

• 한국산학기술학회논문지
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• 제15권2호
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• pp.1157-1163
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• 2014

본 논문은 동력분산식 차세대고속열차가 최고속도 400km/h 이상으로 개발됨에 따라 차량의 최고속도 시험에 대비하여 호남고속철도 건설구간에서 인프라시스템 기술개발이 필요하여 국내에서는 유일하게 현재 호남고속철도 건설구간 중 28km 구간에서 400km/h급 고속철도 인프라를 구축하였다. 또한 계측장비의 설치 및 모니터링 시스템을 설치하여 선로의 지속적인 모니터링이 가능하도록 설계하였다. 이를 통해, 보다 포괄적이며 장기적인 관점에서 통합모니터링의 요구사항과 향후 연구방향을 확인할 수 있었다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권9호
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• pp.3034-3055
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• 2014

Wireless Sensor Networks have extensively been utilized for ambient data collection from simple linear structures to dense tiered deployments. Issues related to optimal resource allocation still persist for simplistic deployments including linear and hierarchical networks. In this work, we investigate the case of dimensioning parameters for linear and tiered wireless sensor network deployments with notion of providing extended lifetime and reliable data delivery over extensive infrastructures. We provide a single consolidated reference for selection of intrinsic sensor network parameters like number of required nodes for deployment over specified area, network operational lifetime, data aggregation requirements, energy dissipation concerns and communication channel related signal reliability. The dimensioning parameters have been analyzed in a pipeline monitoring scenario using ZigBee communication platform and subsequently referred with analytical models to ensure the dimensioning process is reflected in real world deployment with minimum resource consumption and best network connectivity. Concerns over data aggregation and routing delay minimization have been discussed with possible solutions. Finally, we propose a node placement strategy based on a dynamic programming model for achieving reliable received signals and consistent application in structural health monitoring with multi hop and long distance connectivity.

• Smart Structures and Systems
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• 제11권5호
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• pp.511-531
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• 2013

Recent advances in low-cost remote monitoring systems have made it possible and practical to perform structural health monitoring (SHM) on a large scale. However, it is difficult for a single remote monitoring system to cover a wide range of SHM applications due to the amount of specialization required. For the remote monitoring system to be flexible, sustainable, and robust, this article introduces a new cost-effective, advanced remote monitoring and inspection system named DuraMote that can serve as a next generation supervisory control and data acquisition (SCADA) system for civil infrastructure systems. To evaluate the performance of DuraMote, we conduct experiments at two representative counterpart sites: a bridge and water pipelines. The objectives of this article are to improve upon the existing SCADA by integrating the remote monitoring system (i.e., DuraMote), to describe a prototype SCADA for civil engineering structures, and to validate its effectiveness with long-term field deployment results.

• 한국신뢰성학회지:신뢰성응용연구
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• 제15권1호
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• pp.60-66
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• 2015

In this paper, The infrastructure case for reproduction or analysis of the mechanism on the fire or the electrics shock of the electrical appliances is proposed. The various electrical appliances(Washing machine, Ballast, Electric heaters, Electronic switches, Mobile phone chargers) used in the home can be tested on the high voltage and over current test through the implementation of the infrastructure. The electrical tests of fire and electric shock consists of the high voltage of maximum 5000 V and over current test of 3 steps(90 A, 60 A, 40 A) and noise test. The mechanism of the fire and the electric shock tests reproduced are analyzed through the monitoring system and the oscilloscope. The electronics manufacturers can prevent accidents through the tests of the electronics factor reproduced and the analysis of the infrastructure designed.