• Structural Monitoring and Maintenance
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• 제10권3호
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• pp.261-281
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• 2023

Magnetic flux sensors are commonly used in monitoring the cable force, but the application of the sensors in large diameter non-closed Galfan cables, as those adopted in Yueqing Gymnasium which is located in Yueqing City, Zhejiang Province, China and is the largest span hybrid space structure in the world, is seldom done in engineering. Based on the construction of Yueqing Gymnasium, this paper studies the cable tension monitoring using the magnetic flux method across two stages, namely, the pre-calibration stage before the cable leaves the rigging factory and the field tension formation stage of the cable system. In the pre-calibration stage in the cable factory, a series of 1:1 full-scale comparative tests were carried out to study the feasibility and relability of this kind of monitoring method, and the influence on the monitoring results of charging and discharging voltage, sensor location, cable diameter and fitting method were also studied. Some meaningful conclusions were obtained. On this basis, the real-time cable tension monitoring system of the structure based on the magnetic flux method is established. During the construction process, the monitoring results of the cables are in good agreement with the data of the on-site pressure gauge.The work of this paper will provide a useful reference for cable force monitoring in the construction process of long-span spatial structures.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2002년도 금형가공 심포지엄
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• pp.26-33
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• 2002

Die Factory follows typical order adaptive manufacturing, and delaying delivery affects directly product development of customer, Manufacturing Management System is tried to comply with the appointed date of delivery. It acquires running signal from NC milling, calculates manufacturing results, and offers the basic data to manage the operation ratio. Thus it offers Production data necessary to accomplish the objective of progress improvement for Unmanned Manufacturing. Manufacturing Management System runs on Web Environment, and is composed of electronic work order, operation ratio data acquisition and totaling module.

• Nuclear Engineering and Technology
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• 제52권5호
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• pp.956-963
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• 2020

Dose optimization for Radioactive Occupational Personal (ROP) is an important subject in nuclear and radiation safety field. The geometric environment of a nuclear facility is complex and the work area is radioactive, so traditional navigation model and radioactive data field cannot form an effective environment model for dose assessment and dose optimization. The environment model directly affects dose assessment and indirectly affects dose optimization, this is an urgent problem needed to be solved. Therefore, this paper focuses on an environment model used for Dose Assessment and Dose Optimization (DA&DO). We designed a multi-layer radiation field coupling modeling method, and then explored the influence of the environment model to DA&DO by virtual simulation. Then, a simulation test is done, the multi-layer radiation field coupling model for nuclear facilities is demonstrated to be effective for dose assessment and dose optimization through the experiments and analysis.

• 환경영향평가
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• 제22권5호
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• pp.513-523
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• 2013

This purpose of this work is to explore the characteristics of urban thermal environment distribution with the case of Daejeon. To do that, this work applied GIS Spatial Statistics to the LandSAT images gathered from 2000 to 2011. The urban thermal environment distribution at the time point of 2 showed high spatial autocorrelation. Therefore, it is judged that spatial autocorrelation is needed to increase the reliability and explanatory power of the characteristics of thermal environment distribution. In the case of the thermal in Daejeon, its positive clustering appeared high at the time point of 2, and its clustering in 2011 more gradually decreased than that in 2000 to 2011. In particular, given the decrease in the core H-H region, it was found that the thermal environment of Daejeon was greatly improved. However, since the rise in the region L-L means another changed like construction of a new city, it is judged that it is necessary to come up with a proper plan. It is considered that this analysis of the characteristics of urban thermal environment distribution in consideration of spatial autocorrelation L-L be useful for providing a fundamental material necessary for the policy and project of thermal environment improvement.

• 드라이브 ㆍ 컨트롤
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• 제19권4호
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• pp.29-35
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• 2022

In this paper, we developed a workload index for monitoring the durability test using operation information of an excavator. First, the acceleration and cylinder pressure were selected as load factors by analyzing operation data. Through load correlation analysis according to each load factor, Root Mean Square (RMS) and Work Load Range (WLR) were respectively derived as a load feature representing mechanical load. In addition, the workload index was used to quantify load features. For applying the workload index to monitoring, a real-time monitoring system consisting of sensors and embedded controller was installed on the excavator and the system was integrated with a remote monitoring environment using a wireless network. Results of load monitoring and analysis verified that the developed workload index was effective from the viewpoint of the relative comparison of the workload.

• 한국산업보건학회지
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• 제26권4호
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• pp.454-465
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• 2016

Objectives: The purpose of this study was to evaluate trends in asbestos exposure among asbestos-handling industries from 2000 to 2005. Methods: The data included the number of industries and workers exposed, concentrations of asbestos and the amount exceeded, and the type and size of industry by year. These data were collected by 46 regional employment and labor offices in Korea using work environment monitoring reports. A total of 1,481 samples from 284 industries were extracted from the reports and were analyzed with no data modification. Results: The means of asbestos concentration decreased from $0.84f/cm^3$ to $0.03f/cm^3$ during the period 2000-2005. Among the total of 1,481 samples, 11 samples(0.7%) exceeded the KOEL, and 178 samples(12.0%) were ACGIH TLV. The insulating paper product manufacturing industry was found to have the highest level of asbestos, followed by the fireproofing manufacturing industry, brake lining products manufacturing industry, commutator products manufacturing industries, and construction materials manufacturing industry. The number of asbestos handling industries decreased from 48 industries with 1,155 employees to 37 industries during the period of 2000 to 2005, but the number of asbestos workers expanded to the point that 1,182 employees could be found in 2005. Conclusion: Based on these results, the strengthening of the KOEL and new regulations turned out to help reduce asbestos exposure levels. This study recommends that retrospective exposure to asbestos based on various industry types should be assessed.

• 한국산업보건학회지
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• 제4권1호
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• pp.117-126
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• 1994

Some of the important and vital roles performed by the Health Care Center of Pohang Iron & Steel Co., Ltd.(POSCO) are the periodic monitoring of the work sites as well as regular medical check-ups for each workers to ensure both pleasant and safe working conditions and to protect employees' health. Pohang Steel Works, which has 42 plants, 26 facilities and 12,000 employees, has an annual crude steel production capacity of 9,670,000 using 24,500,000 ton of raw materials. We have measured lots of areal and personal working environment according to Occupational Safety and Health Law semiannually. All data collected on industrial hygiene is stored and managed by personal computer. The developed of a computerized industrial hygiene control system linked to the company's main computer system will provide efficient evaluation of the working environment as well as critical informations on employees' health. Development of this system had begun in May, 1992 and was completed in March, 1994. The computerized industrial hygiene control system can; 1. store industrial hygiene data, providing key pertinent to the diagnosis of occupational related illnesses, and if necessary, the basis for improving the working environment, 2. decide type and time of medical examination of each work for exposure to specific agents, and supply proper protection periodically, 3. prevent occupational related illnesses through evaluation of environmental and biological monitoring, and performance of epidemiological surveillance, 4. facilitate proper job placement through linking of industrial hygiene control and personnel information systems, 5. monitor job processes. levels of chemical agents used, and new agents introduced, 6. and increase productivity by saving time resulting from the implementation of the computerized sysyte,

• 환경영향평가
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• 제7권2호
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• pp.103-112
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• 1998

일본에서는 자연친화형 하천사업을 많이 시행하고 있다. 바람직한 수환경을 보전하고 복원하기 위해서는 하천내외의 생태계에 대한 수질기준을 정립하여야 한다. 본 논문에서는 생물학적 지표를 사용한 수질 분류 방법을 개발하여 나가사키현의 혼묘하천에 대하여 적용하였다. 이러한 수질 분류를 위하여, 수정된 오염물 지표 분류법을 제안하였다. 비교적 단순한 방법이지만, 가장 많은 종에 대한 3가지 지표만으로 수질을 효과적으로 평가할 수 있었다. 또한, 하천유역의 통합관리를 위하여 다양한 생태계 자료를 포함하는 종합적인 자료관리시스템을 개발하였다. 본 시스템을 사용하여 건전한 수환경을 보전하기 위한 각종 생태계 자료를 쉽게 취득할 수 있다. 본 연구의 결과를 사용하여 수질자료를 개선하고, 시민들의 의식을 고양하며, 하천관리계획을 세울 수 있을 것이다. 일본에서는, 자연친화적 하천복원사업에 있어서 시민들의 의식 및 행동이 가장 중요한 요소이다.

• 현장농수산연구지
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• 제18권1호
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• pp.101-112
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• 2016

본 연구는 원예시설의 원격제어에 대한 불안감을 해소하고 신뢰성을 확보하기 위하여 감시 및 제어 기능과 안정성을 높인 ICT기반 온실제어시스템을 개발하고 비닐하우스에 적용하여 그 성능을 검증하고자 하였다. 온실 환경 제어 시스템은 온실의 환경 정보를 취득하는 센서와 센서G/W로 구성된 센서부와 온실의 환경을 제어하는 PLC, 이더넷 통신을 통해 환경 정보 데이터와 구동부의 작동상태를 수집하고 외부 서버와 연계되어 환경정보와 제어정보를 전달하는 로컬서버, 천.측창, 커튼 등을 작동시키는 구동부, 재배작물과 작동부 감시를 위한 카메라 등으로 구성하였다. 온실 환경 제어 시스템은 현장제어와 원격 제어 간의 충돌을 방지하기 위해 원격/로컬 상태 구분을 위한 선택 스위치와 원격제어에 따른 안전성을 확보하기 위한 안전장치를 마련하였다. 즉, 각 내부장치를 동작시키는 전자개폐기, 조작 스위치로부터 상태를 수집하며, 모터 등 과부하 발생 시 과부하계전기의 TRIP신호를 감지하여 운영자의 컴퓨터와 스마트폰으로 경보가 보내지도록 구현하였다. 소프트웨어는 웹브라우저를 이용한 HMI(Human Machine Interface) 구현으로 관리자 페이지를 통해 다수의 브라우저에서도 지원 가능하도록 하였다. 또한, 모바일 웹방식을 도입하여 안드로이드, 아이폰 등 운영체제와 상관없이 구동할 수 있도록 구현하였다. 제어화면은 운영자가 한눈에 알아보기 쉽게 온실의 모형과 부대 장치와 작동기기를 이미지화하여 동작 상태를 표시하도록 하였으며, 작동 버튼을 클릭하여 수동조작도 가능하도록 구현하였다. 온실 환경 제어 시스템 성능시험결과 천창, 측창, 수평커튼, 측면커튼은 작동 조건에 따라 모두 성공적으로 작동함을 확인하였다. 또한, 소프트웨어의 데이터 수집 및 디스플레이 상태, 이벤트 출력, 영상모니터링 등 계측 및 제어성능 모두 양호하게 나타났다.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.418-425
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• 2022

For a commercial building, property managers play an important role in maximizing the benefit by reducing cost and increasing revenue in the operation and maintenance phase of the building. However, most of property managers are spending their time in monitoring facility managers who have little impact on cost reduction and maximization of operating profit. The industry practitioners have difficutlty in increasing the efficiency of thier work due to this work environment. In addition, both property managers(PMr) and facility managers(FMr) are dependent on the paper drawings and manuals, which can worsen the inefficiency and human errors are inevitable. This study aims to contribute to improvement of the current practice by developing a novel algorithm that autmatically links the facility information with 3D model, which can provide an efficient property management for commercial buildings.