• Title/Summary/Keyword: Health monitoring

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Wireless health monitoring of stay cable using piezoelectric strain response and smart skin technique

  • Kim, Jeong-Tae;Nguyen, Khac-Duy;Huynh, Thanh-Canh
    • Smart Structures and Systems
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    • v.12 no.3_4
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    • pp.381-397
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    • 2013
  • In this paper, wireless health monitoring of stay cables using piezoelectric strain sensors and a smart skin technique is presented. For the cables, tension forces are estimated to examine their health status from vibration features with consideration of temperature effects. The following approaches are implemented to achieve the objective. Firstly, the tension force estimation utilizing the piezoelectric sensor-embedded smart skin is presented. A temperature correlation model to recalculate the tension force at a temperature of interest is designed by correlating the change in cable's dynamic features and temperature variation. Secondly, the wireless health monitoring system for stay cables is described. A piezoelectric strain sensor node and a tension force monitoring software which is embedded in the sensor are designed. Finally, the feasibility of the proposed monitoring technique is evaluated on stay cables of the Hwamyung Grand Bridge in Busan, Korea.

Computer Vision-based Structural Health Monitoring: A Review

  • Jun Su Park;Joohyun An;Hyo Seon Park
    • International Journal of High-Rise Buildings
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    • v.12 no.4
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    • pp.321-333
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    • 2023
  • Structural health monitoring is a technology or research field that extends the service life of structures and contributes to the prevention of disaster accidents by continuously evaluating the safety, stability, and serviceability of structures as well as allowing timely and proper maintenance. However, the contact-type sensors used for it require considerable time, cost, and labor for installation and maintenance. As an alternative, computer vision has attracted attention recently. Computer vision has the potential to make quality, deformation, and damage monitoring for structures contactless and automated. In this study, research cases in which computer vision was utilized for structural health monitoring are introduced, and its effects and limitations are summarized. Therefore, the applicability and future research directions of computer vision-based structural health monitoring are discussed.

Building structural health monitoring using dense and sparse topology wireless sensor network

  • Haque, Mohammad E.;Zain, Mohammad F.M.;Hannan, Mohammad A.;Rahman, Mohammad H.
    • Smart Structures and Systems
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    • v.16 no.4
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    • pp.607-621
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    • 2015
  • Wireless sensor technology has been opened up numerous opportunities to advanced health and maintenance monitoring of civil infrastructure. Compare to the traditional tactics, it offers a better way of providing relevant information regarding the condition of building structure health at a lower price. Numerous domestic buildings, especially longer-span buildings have a low frequency response and challenging to measure using deployed numbers of sensors. The way the sensor nodes are connected plays an important role in providing the signals with required strengths. Out of many topologies, the dense and sparse topologies wireless sensor network were extensively used in sensor network applications for collecting health information. However, it is still unclear which topology is better for obtaining health information in terms of greatest components, node's size and degree. Theoretical and computational issues arising in the selection of the optimum topology sensor network for estimating coverage area with sensor placement in building structural monitoring are addressed. This work is an attempt to fill this gap in high-rise building structural health monitoring application. The result shows that, the sparse topology sensor network provides better performance compared with the dense topology network and would be a good choice for monitoring high-rise building structural health damage.

Structural Health Monitoring System of Long-Span Bridges in Korea

  • Chang, Sung-Pil
    • Corrosion Science and Technology
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    • v.3 no.2
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    • pp.39-46
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    • 2004
  • Development and application of structural health monitoring system in Korea have become active since the early 1990's. In earlier applications, health monitoring systems were installed in several existing bridges in order to collect initial field data by full scale load capacity test for design verification and subsequently monitor long-term performance and durability of the bridge as part of an inspection and maintenance program. Recently, modem and integrated monitoring systems have been introduced in most of the newly constructed long-span bridges since the design stage. This paper outlines the progresses and applications of monitoring systems in Korea for both existing and newly constructed bridges and describes their aims and characteristics.

Web Information Systems for Safety and Health Monitoring in Subway Stations

  • Choi, Gi-Heung
    • International Journal of Safety
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    • v.8 no.1
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    • pp.10-13
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    • 2009
  • In this study, a framework for web-based information system in VDN environment for safety and health monitoring in subway stations is suggested. Since physical variables that describing safety and health need to be closely monitored in multiple locations in subway stations, concept of distributed monitoring network using wireless media needs to be implemented. Connecting remote wireless sensor network and device (LonWorks) networks to the IP network based on the concept of VDN can provide a powerful, integrated and distributed monitoring performance, making a web-based information system possible.

A Study of Health & Disaster Monitoring Measurement using Ubiquitous Active Communication Digital Datalogger System for Railway Structures (유비쿼터스 기반 통신의 철도구조물에 대한 재난감지용 능동형 데이터로거 시스템 연구)

  • Lee, Seong-Won
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.470-475
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    • 2011
  • The objective of this study is the developement health & disaster monitoring measurement using ubiquitous active communication digital datalogger system for monitoring measurement of railway construction sites. For the replacement of current passive data communication, ubiquitous active communication digital datalogger system is studied for the first time with in a country. Therefore data communication method and analyzing program of automatic measurement data is developed for the global positioning automatic digital datalogger system. The results of this study will be using both real time automatic monitoring measurement and health & disaster monitoring measurement of railway structures.

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Estimating the Number of Target Workplaces for Work Environment Monitoring using Survey Data among Manufacturing Businesses with More than Five Employees in 2016 (5인이상 제조업에서 설문조사를 통한 작업환경측정 대상 사업장의 규모 추정)

  • Bahk, Jinwook;Kim, Seung-Won;Yang, Seon-Hee;Ryu, Hyang Woo;Kim, Eun-A
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.28 no.2
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    • pp.166-174
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    • 2018
  • Objectives: This study aimed to estimate the number and proportion of target workplaces for work environment monitoring and evaluate the implementation rate of work environment monitoring. Methods: A questionnaire survey was conducted by the Ministry of Employment and Labor between March and May 2017 among 96,295 manufacturing businesses with more than five employees. The response rate was 17.8%. Estimates of the number and proportion of target workplaces for work environment monitoring were calculated as follows: number of workplaces where work environment monitoring was performed in 2016 + exposure rate based on the questionnaire * number of workplaces where work environment monitoring was not conducted. Results: Of the 150,655 total manufacturing businesses with more than five employees, 63,146 are estimated to be subject to work environment monitoring, which accounted for 41.9% of the workplaces. It is estimated that 73.3% of the target workplaces performed work environment monitoring. The number of workers exposed to hazardous substances is estimated to be about 0.7~1.2 million. Conclusions: Information on the distribution of workplaces subject to work environment monitoring and the rate of implementation can be used as baseline information for management and evaluation of the effectiveness of the work environment monitoring system.

Achievements, Problems, and Future Direction of the Quality Control Program for Special Periodic Health Examination Agencies in Republic of Korea

  • Won, Yong Lim;Ko, Kyung Sun;Park, Jae Oh;Choi, Yoon jung;Lee, Hyeji;Sung, Jung-min;Lee, Mi-young
    • Safety and Health at Work
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    • v.10 no.1
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    • pp.125-129
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    • 2019
  • The ultimate goal of the quality control program for special periodic health examination agencies is to diagnose the health condition of a worker correctly, based on accurate examination and analysis skills, leading to protect the worker's health. The quality control program on three areas, chemical analysis for biological monitoring since 1995, and pneumoconiosis, audiometric testing since 1996, has contributed to improve the reliability of occupational health screenings by improving the issues including standardization of testing methods, tools, diagnostic opinions, and reliability of analysis for biological monitoring. It has contributed to improving the reliability of occupational health monitoring by rectifying the following issues associated with previous monitoring: absence of standardized testing methods, testing tools that are not upgraded, mismatching diagnostic opinions, and unreliable results of biological specimen analysis. Nevertheless, there are issues in need of further improvement such as lack of expertise or the use of inappropriate method for health examination, and passive and unwilling participation in the quality control. We suggested solutions to these problems for each area of quality control program. Above all, it is essential to provide active support for health examiners to develop their expertise, while encouraging all the health screening agencies, employers, and workers to develop the desire to improve the system and to maintain the relevance.

Remote structural health monitoring systems for next generation SCADA

  • Kim, Sehwan;Torbol, Marco;Chou, Pai H.
    • Smart Structures and Systems
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    • v.11 no.5
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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.

A Study on Monitoring Techniques for Dermal Exposure to Hazardous Chemicals

  • Lee, Su-Gil;Lee, Nae-Woo
    • International Journal of Safety
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    • v.8 no.1
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    • pp.18-23
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    • 2009
  • Due to dermal exposure to hazardous chemicals causing potential adverse health symptoms through skin absorption, dermal monitoring has had an important role in assessing such exposure. This paper overviews comparatively a number of studies of dermal monitoring with different methodologies such as surface monitoring, skin wiping, skin washing, adhesive methods and tape stripping, fluorescence and infrared spectroscopy, skin patches, pads and clothing, video exposure monitoring and dermal exposure assessment toolkits and models. However, there is a lack of information on the relationship between exposure levels and adverse health symptoms. Therefore, more specific strategies for dermal exposure monitoring should be developed and standardized with further development of biological and ocular monitoring.