• 전기학회논문지P
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• 제59권3호
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• pp.335-339
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• 2010

In this paper, in order to reduce the electrical disaster damage which is caused by with electrical equipment of traditional markets, we developed the cabinet panel and the electrical safety monitoring system which is able to monitor the electrical equipments condition(over current, leakage current, arc, WH, electrical fire factor etc.) at traditional markets. We constructed Test-bed for testing reliability of electrical safety monitoring system and cabinet panel. And we tested the cabinet for over current, leakage current and arc under the traditional markets actual condition. This paper will be used with the data for an demonstration project after compensating the defects which are occurred to operation of traditional markets actual loads.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.469-472
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• 2008

In general, structures in service gradually lose original performance according to time due to initial defects in design and construction, or exposure to unfavorable external conditions such as repeated loading or deteriorating environment, and in extreme cases, may collapse in large disaster. Therefore, in order to maintain the serviceability of structures at optimal level, advanced structure measuring system which can inform optimal time point and method of maintenance is required in addition to accurate prediction of residual life the structure by periodic inspection. To guarantee the safety level of bridge structure and to prevent from disaster, the integration of safety network for bridge structures are needed. Therefore in this study, to enhance the effectiveness of safety network for bridge, the connection methodologies between safety network and pre-installed bridge monitoring system are investigated.

• 한국재난정보학회 논문집
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• 제12권4호
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• pp.358-365
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• 2016

미세먼지는 실생활과 밀접한 관련이 있으며 특히, 2014년 2월부터 대국민 환경서비스 제공의 일환으로 미세먼지 예보제를 시행중에 있어, 대기오염 측정망을 통한 미세먼지 측정자료의 신뢰성을 확보할 필요성이 대두되었다. 환경부에서는 국가 대기질 파악 및 대기정책수립을 위해 대기오염측정망(11종 506개소)을 운영 중이다. 그러나 현재 측정소 입지 선정 과정과 적합성을 확인 및 점검하는 체계가 미흡하다. 따라서 본 연구에서는 GIS를 활용한 도시 공간분석을 통해 대기오염 측정시설의 적절성 및 입지 형평성 등을 평가하고자 한다. 분석 결과를 통해 향후 서울시 대기오염 측정망 설치 계획에 반영 될 수 있도록 측정망의 최적입지를 도출함을 최종 목적으로 한다.

• 한국재난정보학회 논문집
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• 제20권1호
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• pp.117-127
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• 2024

연구목적: 중소기업 제조공장에서 에너지 관리, 온도, 습도, 분진 및 가스, 공기 질, 기계작동 상태 등을 통합적으로 모니터링하여 에너지 절감 및 제조 공장 인프라의 안전성 향상을 위한 기반 연구를 수행하는 것이 목적이다. 연구방법: 이를 위해 디지털 전력량계 및 IoT 센서를 통해 에너지 관련 데이터 및 환경적인 정보들을 실시간으로 수집하였으며, 수집된 정보를 기반으로 모니터링 및 분석을 통해 에너지 절감을 위한 상황 전파 및 대응을 위한 연구를 진행하였다. 연구결과: ESG 경영 활동의 핵심 지표에 속하는 에너지관리, 비용 절감과 안전성 향상을 고려한 적용 방안을 제시하였다. 결론: 본 연구는 기업에서 실제적인 사례 연구로 스마트공장에서 다양한 센서 장치와 관련된 장치들을 활용하였으며, 이를 통해 수집된 정보를 기반으로 에너지 절감 및 안전성 향상에 대한 기반의 체계를 제시하였다.

• 한국안전학회지
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• 제29권5호
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• pp.47-53
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• 2014

Despite the automatic fire alarm system, according to the national fire data system of national emergency management agency, the fires account for 40,932 incidents, 2,184 injuries and about 430 billion won in property losses in 2013. Since the conventional automatic fire alarm system has several weaknesses related to electrical signal such as noise, surge, lighting, etc. Most fires are mainly caused by electrical faults, mechanical problem, chemical, carelessness and natural. The electrical faults such as line to ground fault, line to line fault, electrical leakage and arc are one of the major problems in fire. This paper describes the development of a novel real-time fire monitoring system algorithm including fault detection function which puts the existing optic smoke and heat detectors for fire detection with current and voltage sensors in order to utility fault monitoring using high accuracy DAQ measurement system with LabVIEW program. The fire detection and electrical fault monitoring with a proposed a new detection algorithm are implemented under several test. The fire detection and monitoring system operates according to the proposed algorithm well.

• 한국재난정보학회 논문집
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• 제12권2호
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• pp.122-129
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• 2016

본 연구에서는 돌발적 충격에 의한 파손사전 예방감시를 위한 이중구조 파이프, 측량 및 시공 속성정보 수집을 위한 스마트 폰 앱 프로그램 개발, 실시간 감시를 위한 서버프로그램 등을 개발하였다. 본 연구에서 개발한 시스템의 효과를 분석하기 위하여 파일럿규모의 시험을 야외시험장에 구축하였다. 파손 예방을 위한 데이터는 파이프에 부착된 센서를 통하여 감지된다. 누출은 압력센서를 일정한 간격으로 설치하여 시험하였다. VRS 측량장비와 스마트폰을 연계한 앱 프로그램과 서버프로그램을 통하여 실시간 자료 수집과 감시가 가능하도록 하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
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• pp.677-694
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• 2009

While the budget has been allocated more for repairs and reinforcements, casualties are gradually increased due to slope disaster. Slope disaster causes road damaged as well as casualties. It also causes significant social and economic loss. The measurement device, which is installed inside ground of slope like inclinometer, has the high loss rate when slope is being slided. The electric type and the vibrating wire type have low durability because of corrosion. To cover the demerit of the present slope monitoring, the measurement method using the Multi-Antenna GPS has been developed. The Multi-Antenna GPS has been installed in the local slope as the regular monitoring system for slope. Although the initial cost of the Multi-Antenna GPS for installation is high, the additional cost is low. So it is the suitable method for large slope. The regular monitoring system using the Multi-Antenna GPS is the suitable measurement method for watching slope collapse, which is occurred widely, because it is economical, has high durability, and collects data with high resolution.

• Ocean and Polar Research
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• 제31권4호
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• pp.415-422
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• 2009

The wave observation system in Korea has been established with an emphasis on pointmeasurement based on in situ instrumentations. However, the system cannot fully investigate the coastal wave-related problems that are significantly localized and intensified with three-dimensional regional geometries. Observation technique that can cover local processes with large time and spatial variation needs to be established. Video imaging techniques that can provide continuous monitoring of coastal waves and related phenomena with high spatial and temporal resolutions at minimum cost of instrumentation risks are reviewed together with present status of implementation in Korea. Practical applications of the video imaging techniques are suggested to tackle with various coastal issues of public concern in Korea including, real-time monitoring of wave runup and overtopping of swells on the east coast of Korea, longshore and rip currents, morphological and bathymetric changes, storm surge and tsunami inundation, and abnormal extreme waves in the west coast of Korea, etc.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.361-364
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• 2008

무선 센서 네트워크(Wireless Sensor Network: WSN)의 응용서비스 모델은 센서, 마이크로 컨트롤러, 무선 통신 칩셋을 결합한 센서 하드웨어에 의한 센서 네트워크, 데이터 처리를 위한 미들웨어, 사용자 서비스의 형태로 구성된다, 이러한 WSN응용은 환경모니터링, 공장자동화와 같은 분야에 적용되어 왔고, 주로 사람이 감시하기 힘든 원격 모니터링을 기반으로 하는 응용서비스에 집중되어 왔다. 본 논문에서는 무선 센서 네트워크의 응용모델을 기반으로 유비쿼터스 방재 시스템에 적용하기 위한 구축 고려요소에 대해 서술하고, 그 응용 범위의 적합성을 논한다. 제안하는 모델은 무선 센서 네트워크 하드웨어, 라우팅 기술, 미들웨어 구성요소, 보안정책에 관한 내용이 포함되어 있다.

• Smart Structures and Systems
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• 제29권3호
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• pp.475-484
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• 2022

The loss of cable tension for civil infrastructure reduces structural bearing capacity and causes harmful deformation of structures. Currently, most of the structural health monitoring (SHM) approaches for cables rely on contact transducers. This paper proposes a cable tension identification technology using percussion sound, which provides a fast determination of steel cable tension without physical contact between cables and sensors. Notably, inspired by the concept of tensioning strings for piano tuning, this proposed technology predicts cable tension value by deep learning assisted classification of "percussion" sound from tapping a steel cable. To simulate the non-linear mapping of human ears to sound and to better quantify the minor changes in the high-frequency bands of the sound spectrum generated by percussions, Mel-frequency cepstral coefficients (MFCCs) were extracted as acoustic features to train the deep learning network. A convolutional neural network (CNN) with four convolutional layers and two global pooling layers was employed to identify the cable tension in a certain designed range. Moreover, theoretical and finite element methods (FEM) were conducted to prove the feasibility of the proposed technology. Finally, the identification performance of the proposed technology was experimentally investigated. Overall, results show that the proposed percussion-based technology has great potentials for estimating cable tension for in-situ structural safety assessment.