• International Journal of Automotive Technology
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• 제3권1호
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• pp.33-40
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• 2002

Increasingly stringent emission regulations of EU and CARB (California Air resource Board) require mandatory OBD (On Board Diagnostics) far the catalytic converters of a vehicle. It demands that MIL(Malfunction Indication Light) should be tuned on to inform the driver of catalytic converter failures. Currently dual oxygen sensor method Is widely used for the converter OBD. However, since it works only alter converter light-off, it has a serious limitation when applied to TLEV or more stringent emission regulations where more than 85% of total emission is coming out before converter light-off. In addition, a recent development in catalyst material. coating technology and additive catalysts leads to a much improved OSC (Oxygen Storage Capacity) after converter light-off, current methods are very difficult to determine levels of converter aging. Therefore, it is desired to develop an OSC detecting method before converter light-off to diagnose converter failures with higher reliability. In this study, OSCs of converters are measured by an absolute measuring method and a dynamic measuring method, and some of fundamental ideas are suggested about converter OBD before converter light-off. The converters are aged with two different aging methods; those are a furnace aging and an engine bench aging: to represent aging conditions in actual field applications. Dual oxygen sensor method at the lower temperature than light-off is also studied at a model gas bench with the converters. It is fecund that there is a certain point in temperature lower than light-off where difference due to aging level becomes maximum, thus a proper dynamic method to effectively monitor catalytic converters could be implemented fur the range lower than light-off temperatures. With this result, the aging level of converters is examined at an engine bench.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.380-382
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• 2007

As the society changes more to the aging society in future, many healthcare product are developed and distributed more on the market. The digital wrist band tye blood pressure device for home use are popular already in the market. It is useful for checking blood pressure level at home and control of hypertension. Especially. It is very essential home device to check the health condition of blood circulation disease. Nowadays many product types are available. But the measurement accuracy of blood pressure is not enough compared to the mechanical type. It needs to be upgraded to assure the precise health data enough to use in the hospital. The structure, feature and output signal of capacitor type pressure sensors are analyzed. An improved design fa capacitor sensor is suggested. It shows more precise health data after use on a wrist band type health unit. They can be applied for remote u-health medical service.

• 한국신뢰성학회지:신뢰성응용연구
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• 제12권4호
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• pp.275-285
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• 2012

This paper presents a changes of luminescence property for converted white LEDs with the commercially available silicate phosphor. If silicate phosphor's quantity increase step by step. luminescence property will be changing. we analyze luminescence property for these change and carry out the high temperature aging test for 7,000 hours, the high temperature and humidity aging test for 7,000 hours for reliability. LED degradation not only results in reduced light output but also in color changes. so we monitor correlated color temperature (CCT), chromaticity coordinates(x, y) and spectrum intensity. Those results suggest that humidity factor more bad effect in color changes than temperature factor and Lighting quality is related with quantity of phosphor.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 A
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• pp.271-273
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• 2002

In this paper, we describe the implementation of a monitoring and diagnostic system for GIS. This system monitors operation status of GIS and transmits data from GIS to host. With this system, an operator can monitor an operating condition and judge the aging of each device, and prevent the failure or breakdown in advance.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 추계학술대회 논문집
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• pp.133-134
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• 2009

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 합동 추계학술대회 논문집 정보 및 제어부문
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• pp.391-394
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• 2002

In this paper, we describe the implementation of a monitoring and diagnostic system for Gas Insulator Switchgear(GIS). This system monitors operation status of GIS and transmits data from GIS to host. With this system, a operator can monitor a operating condition and judge the aging of each device, and prevent the failure or breakdown in advance.

• 전자공학회논문지
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• 제53권1호
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• pp.51-58
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• 2016

반도체 제조공정의 발달로 칩의 성능은 더욱 향상되었으나 회로가 미세해지고 복잡해져 동작 환경에 의한 회로의 노화가 가속화 될 수 있다. 회로의 노화는 성능 저하로 나타나며, 결과적으로 시스템 오류를 발생 시킬 수 있다. 고신뢰 시스템에서는, 노화로 인한 오류가 큰 재난으로 이어질 수 있으므로, 사고를 예방하기 위한 오류 발생 예측 기술이 필수적이다. 본 논문에서는 회로의 정상동작 중에 성능 저하를 감지하여 오류를 예측 할 수 있는 모니터링 기법을 제시한다. 모니터링을 위한 별도의 회로를 추가하지 않고 경계 스캔 셀과 TAP 제어기를 재활용한 IEEE 1149.1 경계 스캔 기반의 온-라인 성능 저하 모니터링 방법을 제시한다. 시뮬레이션을 통하여 제안하는 성능 저하 모니터링 기법을 검증한다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 추계학술대회
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• pp.648-651
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• 2014

이 논문에서는 급속한 고령화 사회로 인한 노인성 치매 환자를 위한 헬스케어 서비스 연구에 대한 동향을 소개한다. 현재 우리나라는 사회복지정책이 미비한 상태이기 때문에 치매환자의 가출 및 실종 사건이 증가하고 있고 보호자에게 환자 보호를 위해 많은 노력을 요구한다. 따라서 이 논문에서는 치매환자를 위한 모니터링 서비스의 필요성을 제안한다. 웨어러블 센서를 부착하고 환자의 이동성을 모니터링 함으로 보호자로 하여금 환자의 위치 추적이 가능한 모니터링 서스템을 통해 환자의 안전성을 제공한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.881-882
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• 2006

According as society looks graying trend gradually, more shaped system that can achieve measuring health-state of old people more harmoniously construction required in field of old people's welfare and medical treatment. Health-state is measured by two methods of contact and non-contact. The first, for example measurement of blood pressure or electrocardiogram, requires that measuring equipments are attached on human body but the second, for example X-Ray or MRI, is not. But both of methods are have some of defect, for example attaching equipments, needing of the special equipments or the necessary time, etc. Therefore desirable method of monitoring system must have minimum interrupt about daily life. This study suggest the system that can monitor the user, especially old people's outward aging and health-state by use the PAN TILTER and CCD camera.

• 한국멀티미디어학회논문지
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• 제22권5호
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• pp.588-600
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• 2019

Each year Malaria affects over 200 million people worldwide. Particularly, African continent is highly hit by this disease. According to many researches, this continent is ideal for Anopheles mosquitoes which transmit Malaria parasites to thrive. Rainfall volume is one of the major factor favoring the development of these Anopheles in the tropical Sub-Sahara Africa (SSA). However, the surveillance, monitoring and reporting of this epidemic is still poor and bureaucratic only. In our paper, we proposed a method to fast monitor and report Malaria instances by using Social Network Systems (SNS) and precipitation volume in Nigeria. We used Twitter search Application Programming Interface (API) to live-stream Twitter messages mentioning Malaria, preprocessed those Tweets and classified them into Malaria cases in Nigeria by using Support Vector Machine (SVM) classification algorithm and compared those Malaria cases with average precipitation volume. The comparison yielded a correlation of 0.75 between Malaria cases recorded by using Twitter and average precipitations in Nigeria. To ensure the certainty of our classification algorithm, we used an oversampling technique and eliminated the imbalance in our training Tweets.