• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2002.11a
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• pp.155-159
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• 2002

Wire ropes are used in a myriad of various industrial applications such as elevator, mine hoist, construction machinery, lift, and suspension bridge. Especially, wire rope of crane is important component to container transfer. If it happens wire rope failures in operating, it may lead to safety accident, economic power loss by productivity decline, competitive power decline of container terminal and so on. To solve this problem, we developed wire rope fault detecting system as a portable instrument, and this system is consisted of 3 parts that fault detecting part using hall sensor, permanent magnets and analog unit, and digital signal processing part using data acquisition card, monitoring part using wavelet transform, denoising method. In this paper, a wire rope is scanned by this system after makes several broken parts on the surface of wire rope artificially. All detected signal has external noise or disturbance according to circumstances. So, we applied to discrete wavelet transform to extract a signal from noisy data that was used filter. In practical applications of denoising, it is shown that wavelet pursue it with little information loss and smooth signal display. It is verified that the detecting system by denoising has good efficiency for inspecting faults of wire ropes in service. As a result, by developing this system, container terminal could reduce expense because of extension of wire ropes exchange period and could competitive power. Also, this system is possible to apply in several fields like that elevator, lift and so on.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.662-665
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• 2008

본 연구에서는 기존 병원중심의 생체신호모니터링을 가정 내에서 보다 편리하게 수행하여 일상생활중 지속적인 건강상태를 모니터링하고 계측된 생체신호를 웹을 통해 병원이나 전문가가 실시간으로 모니터링 할 수 있는 생체신호 모니터링 시스템을 구현하였다. 구현한 시스템은 범용적인 건강모니터링에 활용할 수 있는 생체신호인 심전도, 맥파를 측정대상으로 하였다. 심전도와 맥파의 계측을 위하여 신호 측정부를 구성하였고, 신호측정부로부터 검출된 신호를 PC기반의 신호모니터링 프로그램으로 전송하기 위하여 마이크로프로세서를 이용한 신호변환 및 시스템 제어부를 구성하였다. 계측된 데이터는 시스템 자체에서 그래픽 LCD를 이용하여 디스플레이가 가능하도록 구성하였으며, 블루투스 통신을 통해 PC와의 무선통신이 가능하도록 시스템을 구성하였다. 또한 PC기반의 실시간 모니터링 프로그램을 구현하여 데이터의 디스플레이 및 저장이 가능하도록 하였으며, 더 나아가 원격지에서의 신호모니터링이 가능하도록 시스템을 구현하였다.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.41-44
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• 2003

We propose portable equipment that monitors current and voltage of high-potential power transmission lines. In the equipment, a current and voltage sensor are attached to an insulator that supports a power transmission line: A clamped to the power line and the detected current signal is transmitted to the ground station by a wireless optical link using transmission line is detected by a high resistance element, zinc oxide (ZnO). That acts as a potential divider between the power line and ground. We make an experimental device for 66kV power line and demonstrate that it can monitor currents proposed equipment is small-sized, light, and inexpensive in comparison with the conventional CT (current transformer) and PT (potential transformer) since it does not require high potential insulators and magnetic cores, further, the equipment is easily installed owing to its small size and its simple structure.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.7
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• pp.1331-1338
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• 2007

A new method for detecting and eliminating the Electrocardiogram(ECG) artifact from the scalp Electroencephalogram(EEG) is proposed. Based on the single channel EEG, the proposed method consists of 4 procedures: emphasizing the R-wave of ECG artifact from EEG using the least squares acceleration(LSA) filter, detecting the R-wave from the LSA filtered EEG using the phase space method and R-R interval, generating the delayed impulse synchronized to the R-wave and elimination of the ECG artifacts based on the adaptive digital filter using the impulse and raw EEG. The performance of the proposed method was evaluated in the two separating parts of R-wave detection and, ECG estimation and elimination from EEG. In the R-wave detection, the proposed method showed the mean error rate of 6.285(%). In the ECG estimation and elimination using simulated and/or real EEG recordings, we found that the ECG artifacts were successfully estimated and eliminated in comparison with the conventional multi-channel techniques, in which independent component analysis and ensemble average method are used. From this we can conclude that the proposed method is useful for the detecting and eliminating the ECG artifact from single channel EEG and simple for ambulatory/portable EEG monitoring system.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06d
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• pp.157-162
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• 2007

최근 홈 네트워크 및 유비쿼터스 컴퓨팅에 대한 일반인들의 관심이 크게 증가하면서, 10m 내외의 단거리에서 사용되는 개인 무선 네트워킹 솔루션인 무선 PAN 기술이 주목받고 있다. 본 논문에서는 이러한 무선 PAN 기술 중 저속, 저가, 저전력의 무선통신 기술인 ZigBee 이용해 당뇨병 환자들을 위한 실시간 모니터링 시스템을 구현하였다. 즉, 휴대용 인슐린 펌프에 ZigBee 통신이 가능한 모듈을 장착함으로써, 인슐린 펌프에 내장된 환자의 혈당치, 인슐린 투입량 등과 같은 중요 데이터를 별도의 조작 없이 유선 클라이언트에 실시간 전송할 수 있게 된 것이다. 한편, 유선 클라이언트에 저장된 환자의 정보는 서버에 즉시 전송되며, 담당 주치의의 모니터링이 가능하도록 웹 접근성을 부여하였다. 이를 통해 환자들이 보다 안전하고 편리하게 휴대용 인슐린 펌프를 사용할 수 있도록 하였다.

• Journal of Korea Water Resources Association
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• v.34 no.4
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• pp.391-401
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• 2001

Several curvature parameters, solar radiation parameter and topographic flow generation parameters have been summarized and calculated to predict the spatial distribution of soil moisture content. The spatial distribution of soil moisture data can be obtained using Global Positioning System(GPS) and portable soil moisture monitoring equipment, Theta-Probe. Correlation analysis has been performed between the parameters of soil moisture prediction and measured data of soil moisture. Multiple regression analysis of soil moisture prediction shows the potential capability and limitations of existing methods of digital terrain analysis.

• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.467-468
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• 2007

In this paper, we have proposed a new method to extract the fetal ECG from a pregnant woman's abdominal signal using least square acceleration (LSA) filter and adaptive impulse correlation (AIC) filter. To evaluate the performance, the proposed method and other fetal ECG extraction techniques were processed using the real ECG data and then the results were compared. According to comparative results, the proposed method is powerful and successful for extracting the fetal ECG. It was able to separate perfectly even though the fetal beats overlap with the QRS wave of the maternal beats and to extract fetal ECG using any single-channel abdominal signal measured from pregnant woman's abdominal surface. Also, it could be implemented easily by fast computation time and simple structure. It is sure that our method could be useful for portable fetal monitoring system.

• Journal of Environmental Health Sciences
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• v.40 no.3
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• pp.171-177
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• 2014

Background: The development of technology can be beneficial for the life and health of human society. Crowdsourcing refers to drawing upon a large pool of individuals in order to seek services, ideas, or other contributions. With the development of information communication technology, crowdsourcing is able to provide powerful results in environmental health research. Methods: We searched 'crowdsourcing' and 'citizen science' for keywords related to the environmental health field and only selected journal articles and conference proceedings material, such as research reports and WHO reports. Results: This paper reviewed environmental health research using crowdsourcing. Examples of such research based on crowdsourcing included practices in environmental disasters, noise monitoring, global positioning system (GPS) technology, smart phones, attached portable devices and information delivery by web. Crowdsourcing methods can provide notably distinct approaches for future environmental health research. However, it is also important to protect personal information whenever crowdsourcing is applied to data generation and information dissemination. Conclusion: We expect that this review may provide useful information for the development of new environmental health research methods using crowdsourcing and citizen science.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1910-1911
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• 2007

A new method for estimating and eliminating electrocardiogram (ECG) artifacts from single channel scalp electroencephalogram (EEG) is proposed. The proposed method consists of emphasis of QRS complex from EEG using least squares acceleration (LSA) filter, generation of synchronized pulse with R-peak and ECG artifacts estimation and elimination using adaptive filter. The performance of the proposed method was evaluated using simulated and real EEG recordings, we found that the ECG artifacts were successfully estimated and eliminated in comparison with the conventional multi-channel techniques, which are independent component analysis (ICA) and ensemble average (EA) method. In conclusion, we can conclude that the proposed method is useful for the detecting and eliminating the ECG artifacts from single channel EEG and simple to use for ambulatory/portable EEG monitoring system.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.11a
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• pp.33-42
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• 2005

Studies on community annoyance caused by transportation noise exposure were carried out in fifty-one areas around Gimpo and Gimhae international airports, Gyungbu and Honam railway lines and east and riverside-northen motorway to accumulate social survey data and to assess the relationship between each transportation noise level and degree of annoyance in Korea. The measurements of transpotation noise were carried out using portable precision sound level meters (B&K type 2238 and LD 812) except in aircraft noise. Aircraft noise levels were measured automatically by airport noise monitoring system, B&K type 35n Social surveys were carried out to people living around noise measurement points. Questionnaires were only aggregated by face-to-face interviews using various questions concerned with demographic factors, degree of noise annoyance, interference with daily activities and health-related symptoms. The questions of noise annoyance were answered on an 11-point numerical scale. The respondents, from 18 to 70 years of age, were randomly selected and completed the questionnaire for themselves. The total number of respondents for the questionnaires was 1,839. The results showed that community annoyance of railway noise in Korea is similar to that in Japan, but is more severe than that in European countries.