• 전기학회논문지
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• 제67권7호
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• pp.884-891
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• 2018

In this paper, we propose an automatic earthquake P-wave detection algorithm based on the variations of the impact momentum derived from the seismic acceleration signals. The amount of change in the impact momentum induced by the acceleration refers to the influence of buildings or facilities on the earthquake, The proposed algorithm can effectively detect the seismic P-wave by simultaneously considering the amplitude and the frequency change of the seismic wave when the earthquake occurs. Computer simulations using the observed seismic signals were performed to evaluate the validity of the induced impact momentum variation and the superiority of the proposed algorithm.

• 한국항행학회논문지
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• 제24권6호
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• pp.479-484
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• 2020

FOD (foreign object debris)는 활주로 내의 항공기 운항과정에서 이에 위협을 가할 수 있는 모든 물질들을 총칭하는 단어이다. 과거 활주로 내에서 인적자원을 이용한 FOD 탐지 및 수거 방식은 효율성 및 경제성 면에서 매우 비효율적이기 때문에 국내에서 사용하기에 적합한 무인 FOD 탐지 시스템 개발이 필수적으로 요구되는 실정이다. 본 논문에서는 한서대학교 태안비행장에서 EO카메라 및 레이더를 이용한 고정형 FOD 자동 탐지 시스템과 이동형 FOD 자동 탐지 시스템을 연구 및 개발하고 고정형과 이동형 방식을 운용하여 조도 및 기상환경에 상관없이 비행장의 활주로 내 자동 FOD 탐지가 가능함을 확인하였다.

• 한국항행학회논문지
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• 제23권6호
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• pp.495-500
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• 2019

FOD (foreign object debris)는 각종 금속 및 비금속 이물질 및 항공기 운항에 잠재적 위험요소를 가진 물질을 총칭한다. 항공기 이동지역에서 사람이 직접 FOD 탐지 및 수거를 하던 방식은 효율성 및 경제성 또한 매우 낮기 때문에 국내환경에 적합한 FOD 자동 탐지 시스템 개발이 필수적으로 요구된다. 본 논문에서는 한서대학교 태안비행장에서 EO/IR카메라 및 레이더를 이용한 고정형 이물질 자동 탐지 시스템과 이동형 이물질 자동 탐지 시스템을 이용하여 100 m이상 최적탐지시간과 90% 탐지 정확도의 복합운영을 위한 두 시스템의 성능비교 실험 결과이다. 지속적인 연구개발을 통하여 FOD를 무인력으로 수행 할 수 있을것으로 기대된다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 하계종합학술대회 논문집
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• pp.1063-1066
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• 1999

The delay of cardiac depolarization wave detection in the conventional pacemakers or AICD (automatic implantable cardioverter/ defibrillator, or ICD) has been overlooked. However, it is known that the delay may cause hemodynamic problems and may prevent the proper operation of a new automatic feature, automatic capture verification, that is to be appeared in the near-future devices. In order to reduce the effects of the delay, a delay prevention algorithm was developed and tested by applying three human electrograms. The algorithm set the sensing threshold just above the measured noise level to reduce the detection delay. It is found that the low threshold was able to reduce the delay by 20msec(average) In most cases. The implementation results showed reliability and efficacy of the algorithm, and the algorithm could be applicable to the existing hardware and software of the conventional pacemakers and AICD without any significant modifications.

• 대한의용생체공학회:의공학회지
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• 제35권6호
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• pp.211-218
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• 2014

The objective of this research is to develop an automatic algorithm based on electrocardiogram (ECG) to estimate slow-wave sleep (SWS). An algorithm is based on 7 indices extracted from heart rate on ECG which simultaneously recorded with standard full night polysomnography from 31 subjects. Those 7 indices were then applied to independent component analysis to extract a feature that discriminates SWS and other sleep stages. Overall Cohen's kappa, accuracy, sensitivity and specificity of the algorithm to detect 30s epochs of SWS were 0.52, 0.87, 0.70 and 0.90, respectively. The automatic SWS detection algorithm could be useful combining with existing REM and wake estimation technique on unattended home-based sleep monitoring.

• 한국항행학회논문지
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• 제21권6호
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• pp.638-642
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• 2017

FOD는 항공기에 치명적인 위험을 줄 수 있는 잠재적인 위협요인을 가진 물질을 총칭하는 것이다. 이에, FOD는 공항 전 지역에서 주의해야하며 특히 활주로 및 항공기 이동지역에서는 FOD 탐지 및 수거를 하던 방식은 공항운영의 효율성 및 경제성이 매우 낮기 때문에 국내환경에 적합한 FOD 자동탐지시스템 개발이 필수적으로 요구된다. 이에 항공안전기술개발 사업의 일환으로 공항 내부의 항공기 이동지역 이물질 자동탐지 시스템 개발이 진행 중에 있다. 본 논문에서는 한서대학교 태안비행장에서 EO/IR카메라를 이용한 이물질 탐지실험을 진행하여 주간에는 EO카메라를 이용하고 야간에는 IR카메라를 이용하여 모두 정상적으로 탐지됨을 확인하였다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2003년도 봄 학술발표논문집 Vol.30 No.1 (B)
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• pp.193-195
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• 2003

The analysis of EEG data is an important task in the domain of Brain Computer Interface (BCI). In general, this task is extremely difficult because EEG data is very noisy and contains many artifacts and consists of mixtures of several brain waves. The P300 component of the evoked potential is a relatively evident signal which has a large positive wave that occurs around 300 msec after a task-relevant stimulus. Thus automatic detection of P300 is useful in BCI. To this end, in this paper we employ a method of reference-based independent component analysis (ICA) which overcomes the ordering ambiguity in the conventional ICA. We show here. that ICA incorporating with prior knowledge is useful in the task of automatic P300 detection.

• 대한의용생체공학회:의공학회지
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• 제12권1호
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• pp.63-70
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• 1991

Design of Arrhythmia Automatic Diagnostic System Using Decision Table We have developed an arrhythmia automatic diagnostic system using decision table which is based on the criteria of Minnesota code. This system is divided into two Parts. One is wave detection algorithm using significant point extraction method, the other is arrhythmia diag- nostic algorthm. The proposed system allows physicians to diagnose more accurately by pro- viding the objective information about a lot of computer -processed ECG data.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1991년도 추계학술대회 논문집
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• pp.87-94
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• 1991

This Paper is to aim the microdefect evaluation of semiconductor Package into a quantitative from NDI's image processing of ultrasonic wave. Accordingly, for the detection of delamination between the Joining condition of boundary microdefect of semiconductor packaga the result from sampling original image, histogramming, binary image or image processing of multinumerloal value is such as the follows. ([) The least limitation from the microdefect detection of the semiconductor package by surveying high ultrasonic wave seems to be about 0.8 $\mu\textrm{m}$ in degree. (2) A result of applying the image processing of multinumerical value to the semiconductor package it was possible to devide the Category into the effectiveness.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 G
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• pp.2255-2258
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• 1998

Method of diagnosis in oriental medicine, the unbalance of the physiological function of the five viscers and six bowels of the human body is determined from time immemorial with the condition of blood circulation which is performed through blood vessels by the vitality of the heart. In oriental medicine, treatment is largely attempted by adjusting this unbalance. The analysis of pulse wave, which mainly measures the changes in blood flows, is to evaluate the shapes of a pulse wave rather than the quantitative changes like rates and strength of the pulse. This paper presents the development of Hardware System and Pulse Diagnosis Algorithm for automatic diagnosis of the pulse wave. This system makes the precise diagnosis and the objective recording possible.