• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
• /
• pp.249-252
• /
• 2002

Recently, the advanced countries are using the corrosion monitoring system in a chemical plant and an oil tank in order to protect the corrosion because it leads to a big accident, pollution of soil. and lose of money Generally. the owners of the facilities adopt CP(Cathodic Protection) systems to protect the corrosion also. However, a CP system for oil tank was not considered in Korea Moreover they didn't adopted a corrosion monitoring system. In this paper, we have been developed not only the remote automatic corrosion monitoring but also the remote corrosion control system using the high efficiency CP rectifier. This results should be used to operate the CP system effectively and economically. And also it will be possible to extend the expectation life of the Oil tanks.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
• /
• pp.126-129
• /
• 2006

The marine environment is under considerable threat from intentional or accidental oil spills, ballast water discharged, dredging and infilling for coastal development, and uncontrolled sewage and industrial wastewater discharges. Monitoring spills and illegal oil discharges is an important component in ensuring compliance with marine protection legislation and general protection of the coastal environments. For the monitoring task an image processing system is needed that can efficiently perform the detection and the tracking of oil spills and in this direction a significant amount of research work has taken place mainly with the use of radar (SAR) remote sensing data. In this paper the level set image segmentation technique was tested for the detection of oil spills. Level set allow the evolving curve to change topology (break and merge) and therefore boundaries of particularly intricate shapes can be extracted. Experimental results demonstrated that the level set segmentation can be used for the efficient detection and monitoring of oil spills, since the method coped with abrupt shape’s deformations and splits.

• 설비공학논문집
• /
• 제12권8호
• /
• pp.717-724
• /
• 2000

It is important to investigate characteristics of flow of refrigerant/oil mixture circulating in a refrigeration system. Therefore the oil concentration in refrigerant/oil mixture should be measured exactly by the adequate measuring instrument. In this paper, the oil concentration was measured by density monitoring system(DMS) in the liquid-line of a inverter-driven heat pump. Experimental result follows ; the main factor that have an effect on oil concentration refrigerant/oil mixture circulating in a refrigeration system is the momentum and kinematic viscosity of refrigerant/oil mixture compressed by scroll compressor.

• 전기학회논문지
• /
• 제58권3호
• /
• pp.539-543
• /
• 2009

This paper describes the sensitivity enhancement in measurement of the hydrogen gas dissolved in oil using gas collection time. On-line gas measurement is a useful for continuous monitoring of power transformer. Recently many studies on hydrogen gas measurement, due to their simplicity and low price, have been done for transformer monitoring. In measurement of the hydrogen gas in oil, the suitable sensitivity and resolution in the desired ranges of the gas concentrations are needed for the reliable monitoring of power transformers. In this study, the sensor output trends were analyzed with the hydrogen gas collection time which means the time to collect the hydrogen gas before reaction of hydrogen gas sensor. It is indicated that the sensor outputs were increased with the increase of hydrogen gas collection times at the same hydrogen gas concentrations.

• 대한원격탐사학회지
• /
• 제39권3호
• /
• pp.311-323
• /
• 2023

기름 유출 사고는 발생 시 환경과 관련된 다양한 문제들을 야기하므로 신속하게 유출유의 면적과 위치 변화를 파악하는 것이 중요하다. 광학 위성자료를 활용한 기름 유출 탐지의 경우 다양한 위성탑재 센서를 통해 유출유에 대한 정보 수집 후 이를 이용하여 광범위한 기름 유출 범위를 모니터링할 수 있다. 선행 연구에서는 파장별 기름의 반사도를 분석한 후 특정 파장대의 밴드를 이용한 oil spill index가 개발 및 적용되었다. 기름 유출 모니터링을 위해 유출 전후 여러 시기의 위성자료를 분석할 경우 다량의 데이터로 인해 많은 시간과 컴퓨팅 자원이 소비된다. 웹 브라우저를 통해 대량의 위성자료 분석이 가능한 Google Earth Engine을 활용할 경우 효율적으로 기름 유출 탐지가 가능하다. 본 연구에서는 Sentinel-2 MultiSpectral Instrument 위성자료와 클라우드 기반의 위성자료 분석 플랫폼인 Google Earth Engine을 이용하여 기존에 제안된 네 종류의 oil spill index의 다양한 피복 환경에서의 활용성 평가를 수행하였다. 지표 피복별 index 값의 비교를 통해 기름 유출 영역이 타 피복과 잘 구분되는지에 대한 분리도를 평가하고 기름 유출 면적을 산정하였다. 본 연구 결과를 통해 Google Earth Engine이 기름 유출 광역 모니터링에 효율적으로 활용 가능하다는 것을 확인하였고, 복잡한 지표 피복이 분포하는 다른 지역에 기름 유출 사고 발생 시 우수한 성능으로 평가된 oil spill index B ((B3+B4)/B2)와 C (R: B3/B2, G: (B3+B4)/B2, B: (B6+B7)/B5)의 적용은 효과적인 기름 유출 모니터링에 기여할 것으로 판단된다.

• Tribology and Lubricants
• /
• 제24권1호
• /
• pp.7-13
• /
• 2008

In this work, a simple and low cost sensor technique is proposed to test oil color in real time using in-line sensor. It is presented to use a ratio of intensity in red wavelength range to intensities of green and blue wavelength ranges (defined as a 'chromatic ratio') in order to estimate the oil color change. The proposed sensor technique is realized by irradiating a white LED as light source and a RGB color sensor as photoreceiver, and the chromatic ratio of various types of used oils are measured. The results show that chromatic ratio generally reflects chemical deterioration of oil, including oil oxidation and thermal degradation. It is concluded that the proposed sensor could be used for an effective oil monitoring technology.

• Tribology and Lubricants
• /
• 제29권1호
• /
• pp.51-55
• /
• 2013

In this work, a new fluorescence emission measurement technology was introduced and experimentally compared with other measurement methods, such as the titration method and IR spectroscopy, to validate it for the oil oxidation measurement of electrical insulating oil. The oxidation characteristics of insulating oil were found to be fairly represented by the titration method and IR spectroscopy, and the results are comparable to a change in the fluorescence emission ratio that is defined as the shift in fluorescence intensity in the measured wavelength range. The result also shows that by the measurement of fluorescence emission ratio, it is possible to detect the oxidation of oil relatively earlier than by other methods. This study suggests that the developed technology can provide sufficient information for evaluating the insulating oil quality, and that the developed FER sensor can be used as an effective condition monitoring device of electrical insulating oil oxidation.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
• /
• pp.977-980
• /
• 2006

Ships and industries damage the delicate coastal ecosystem in many parts of the world by releasing oil or pollutants into rivers, coastal and offshore waters. After a tanker accident the biggest problem is to get a clear idea of the extent of the oil slick and predict the way it will move. For natural and man-made oil spills it is necessary to operate a regular and operational monitoring. In the Mediterranean, North and Baltic seas aircrafts or ships normally carry it out. This is expensive and is constrained by the limited availability of these resources, borders between countries, daylight hours, good weather conditions, etc. Satellite imagery can help greatly identifying probable spills over large areas and then guiding aerial surveys for precise observation of specific locations. The Synthetic Aperture Radar (SAR) instrument, which can collect data almost independently of weather and light conditions, is an excellent tool to monitor and detect oil on water surfaces. SAR is currently on board the ENVISAT, ERS-2 and RADARSAT satellites. The application of this technology to the investigation of oil pollution in the Caspian, Black, Mediterranean, North and Baltic seas is shown.

• 윤활유협회보
• /
• 9호
• /
• pp.5-11
• /
• 1985

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2000년도 하계학술대회 논문집 A
• /
• pp.544-546
• /
• 2000

This paper presents a monitoring technique of pole transformers using AC bridge circuit. And to detect the capacitance in oil more effectively, this paper used AC bridge circuit. The sensor in oil which could be placed inside of the distribution transformer can measures the changes of capacitance in oil. And with the sensing of the upper part's capacitance, it is possible to determine the changes of the oil height. Establishment of the proposed system helps to build the confidence in monitoring of the pole transformers.