• Title/Summary/Keyword: On-line Monitering

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Strain monitoring of overhead contact line with FBG sensors (FBG 센서를 활용한 가공 전차선의 스트레인 모니터링)

  • Choi, Won-Seok;Ko, Ki-Han;Lee, Kyung-Bok;Park, Young;Cho, Yong-Hyeon
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.1227-1230
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    • 2008
  • This paper reports on measurement method for the fiber optic strain monitoring of overhead contact line systems of trains. We used fiber Bragg grating (FBG) sensors to measure the strain variation of overhead contact line. FBG sensors were attached on the contact line and connected to the monitering system with optical fibers. The monitering system with FBG sensors showed very good sensitivity to measuring strain variation and this system could be applied to the overhead contact line of KTX.

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Monitoring of Temperature and Strain Variation with FBG Sensors (FBG 센서를 활용한 온도와 스트레인 변화 모니터링)

  • Ko, Ki-Han;Park, Young;Cho, Yong-Hyeon;Jung, Ho-Sung;Cho, Yong-Suk;Choi, Won-Seok
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.22 no.3
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    • pp.218-221
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    • 2009
  • This paper reports on measurement method for the fiber optic strain monitoring of overhead contact line systems of trains, We used FBG (Fiber Bragg Grating) sensors to measure the strain variation of overhead contact line. FBG sensors can sensitively measure the variation of strain and! or temperature by the shift wavelength of reflected wave according to the lattice variation during the measurement. FBG sensor were attached on the contact line and connected to the monitoring system with optical fibers. The monitering system with FBG sensors showed very good sensitivity to measuring strain variation and this system could be applied to the overhead contact line of KTX (Korea Train eXpress).

Identification of Guided-wave Modes for on-line monitering in the pipe weldment (배관 용접부의 상시감시를 위한 유도초음파 모드 규명)

  • Park Ik-Geun;Kim Tae-Hyeong;Lee Cheol-Gu;Kim Yong-Gwon;Park Tae-Seong;Lee Jin-Hyeok
    • Proceedings of the KWS Conference
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    • 2006.05a
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    • pp.307-309
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    • 2006
  • For efficient NDE of pipes, essential components of power plant facilities, ultrasonic guided waves were generated and received applying an air-coupled transducer and comb one as non-contact technology, Mode generation and selection were predicted based on theoretical dispersive curve and the element spaceof a comb transducer. In addition, a receiving angle of the air-coupled transducer was determined to acquire the predicted modes by theoretical phase velocity of each mode. Theoretical dispersive curve was compared with the results of the time-frequency spectroscopes based on the wavelet transform and 2D-FFT to identify the characteristics of the received mode. The received modes show a good agreement with the predicted ones.

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A Study on the Capability Analysis of Ship Management Superintendent(SI) for Maritime Autonomous Surface Ship(MASS) - Based on the 3 Stages of the IMO's Classification of Monitering Ship (자율운항선박에 대비한 선박관리감독(SI) 역량 분석에 관한 연구 - IMO 분류 3단계 Monitoring Ship 기준 -)

  • Jin-Ok Jung;Jung-Woo Nam;Jeong-Min Lee;Dae-song Han;In-Gwon Na;Yul-Seong Kim
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2021.11a
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    • pp.76-77
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    • 2021
  • In line with the development of autonomous ships, it is necessary to train professional ship management supervisors to prepare for the transition to the ship's safety management system. Therefore, this study intends to investigate the capabilities required of ship management supervisors in preparation for introduction to autonomously operated ships for ship management supervisors in the field, and to suggest future capability development plans.

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Implementation of the Disaster Monitering System with PLC/CDMA Environments (PLC/CDMA 환경에서의 재난 감시 시스템 구현)

  • Park, Sang-Hwan;Kim, In-Min;Yoon, Seon-Tae;Park, Ki-Won;Go, Bong-Jin
    • Journal of Advanced Navigation Technology
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    • v.14 no.6
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    • pp.824-830
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    • 2010
  • PLC_Zigbee system, implemented in a previous study, uses ZigBee Node based on PLC (Power Line Communication). The weak point of the system is that the long distance powerline communication and PLC is impossible to use in the areas where the powerline is not installed. In this paper, we added CDMA (Code Division Multiple Access) module using a data transfer method of SMS (Short Message Service) and XBee of WSN (Wireless Sensor Network) module to the previous system, and got around the restriction of place and environment of PLC system through the interfacing of each communication media. We, thus, implemented a wide range of real monitoring system.

A study on Land use Survey and Monitoring Forcused on the Subway Station Areas in Taejeon (도시철도 역세권의 공간이용 모니터링을 위한 기초연구)

  • Cho, Byung-Ho;Choi, Bong-Moon
    • The Journal of the Korea Contents Association
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    • v.11 no.2
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    • pp.457-465
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    • 2011
  • This research, which was started with a need for constant monitoring to find out urban societies and spacial effects by urban railway after the opening, was intended to empirically explore urban and social changes by the opening of Daejeon City metro line 1st which would greatly affect the spacial structure of the city. For this goal, we expected the effect of urban subway on the city with academic consideration and precedent study. Monitoring results of the subway station areas of Daejeon City metro line 1st showed the opening of urban railway had an influence on the flow of urban plan and urban space structure through population, land use, total-developing areas, and land price change. In other words, as urban railway opens the number of population and population activities centered on the subway station areas, and these movements led to the expansion of the commercial areas. Finally, they caused the average land prices to rise. Likewise, urban monitering is significantly useful comprehending the generally time-periodic changes of cities and even conceiving the present cities.

An Implementation the e-Healthcare System for the Indoor Diagnosis of the People Using the Color Analysis System (컬러분석시스템을 이용한 재택진료 e-Healthcare System구현)

  • Moon, Hyun-Sik;Kwak, Ji-Young;Kwon, Hyouk-Gil;Kim, Min-Sik;Lee, Eung-Hyuk
    • Proceedings of the KIEE Conference
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    • 2005.10b
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    • pp.545-547
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    • 2005
  • As information technology has been developed rapidly, there is growing online medicine service through forming as information technology and medicine information are amalgamated in the medical service field. That acquires real time biological information of patient through a communication network which could be applied into e-healthcare system for a diagnosis and treatment of patient. Because of these reasons, it is necessary for the e-healthcare system to develop. But,the facilities existing in the medical service field could not be used to an on line environment because of the limitation of the time and space. To solve the point of such issue, we propose an auto color analysis system that is a precise and quick to measure health states of user, and the device has the important merit that it is very low cost. Also, the hospital web database and the monitering webpage for a diagnosis have been made for an e-healthcare system.

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Evaluation Methodology of Greenhouse Gas On-Line Monitoring on Freeway (고속도로 구간의 온실가스 On-Line 모니터링 산정방법)

  • Lee, Soong-bong;Chang, Hyun-ho
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.16 no.2
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    • pp.92-104
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    • 2017
  • Previous management for speed in road traffic system was aimed only to the improvement of mobility and safety. However, consideration for the aspect of environment and energy consumption efficiency was valued less than the former ones. Nevertheless, economical damage scope caused by climate change has been increasing and it is estimated that environmental value will be increased because of the change of external circumstances. In addition, policy for reducing carbon emission in transportation system was assessed as insufficient in improving the condition of traffic road since it only focused on the transition of private vehicle into public transportation and development of eco-friendly car. Now it is the time to prepare for the adaptation strategy and precaution for the increased number of private vehicle in Korea. For this, paradigm shift in traffic operation which includes the policy not only about the mobility but also about caring environment would be needed. It is needed to be able to monitor the actual amount of greenhouse gas in real time to reduce the amount of emitted greenhouse gas in the aspect of traffic management. In this research, a methodology which can build on-line greenhouse gas emission monitoring system by using real time traffic data and predicting the circumstance in next 5 minutes was suggested.

DoS/DDoS attacks Detection Algorithm and System using Packet Counting (패킷 카운팅을 이용한 DoS/DDoS 공격 탐지 알고리즘 및 이를 이용한 시스템)

  • Kim, Tae-Won;Jung, Jae-Il;Lee, Joo-Young
    • Journal of the Korea Society for Simulation
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    • v.19 no.4
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    • pp.151-159
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    • 2010
  • Currently, by using the Internet, We can do varius things such as Web surfing, email, on-line shopping, stock trading on your home or office. However, as being out of the concept of security from the beginning, it is the big social issues that malicious user intrudes into the system through the network, on purpose to steal personal information or to paralyze system. In addition, network intrusion by ordinary people using network attack tools is bringing about big worries, so that the need for effective and powerful intrusion detection system becomes very important issue in our Internet environment. However, it is very difficult to prevent this attack perfectly. In this paper we proposed the algorithm for the detection of DoS attacks, and developed attack detection tools. Through learning in a normal state on Step 1, we calculate thresholds, the number of packets that are coming to each port, the median and the average utilization of each port on Step 2. And we propose values to determine how to attack detection on Step 3. By programing proposed attack detection algorithm and by testing the results, we can see that the difference between the median of packet mounts for unit interval and the average utilization of each port number is effective in detecting attacks. Also, without the need to look into the network data, we can easily be implemented by only using the number of packets to detect attacks.