• 센서학회지
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• 제19권1호
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• pp.8-16
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• 2010

This research proposes measuring of BCG(ballistocardiogram) to monitor heart activities in a non-constrained environment, at home or work. Unlike with ECG, measuring BCG does not require the attachment of leads on the subject's body and allows signal measuring in a non-constrained state. It enables effective long-term monitoring of cardiac conditions. In this study a chair type BCG measurement system to continuous monitor the activity of the heart is implemented. The instrument consists of upper petal and ready for press of chair load cell sensor is attached to measure the change of the object's weight. In order to extract the output ballistic signal from the weight and force sensor signals. Beside the signal processing circuit for the digital conversion, the ballistic signal is detected using DAQ equipment. Signal processing algorithm including wavelet transforms for noise cancellation, template matching for normalization and peak detection in BCG is developed. ECG and BCG were concurrently measured to evaluate the performance of the system, and comparing the characteristics of the two signals verified the possibility of the system in non-constrained and nonconscious health monitoring.

• 한국멀티미디어학회논문지
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• 제19권6호
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• pp.1034-1042
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• 2016

The detection of P-waves and T-wave in the electrocardiogram signal analysis is an important issue. But the accuracy of the boundary detection algorithm is an insufficient level in the change of slow transition in the signal compared to the QRS complex. This study proposes an algorithm to detect P-wave and T-wave sequentially after determining local baseline using QRS complex. First, we detected the peak points based on local baseline and determined the onset and offset through the calculation of the area of the section. After modifying the baseline using detected waveform, we detected the other waveform in the same way and separated the P-wave and the T-wave based on the location. We used the PhysioNet QT database to evaluate the performances of the algorithm, and calculate the mean and the standard deviations. The experiment results show that standard deviations are under the tolerances accepted by expert physicians, and outperform the results obtained by the other algorithms.

• 한국임상수의학회지
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• 제28권1호
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• pp.128-132
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• 2011

Holter monitoring has been recognized as an useful noninvasive instrument for monitoring the cardiac electrical activity over 24 to 48 hours. Because the surface electrocardiogram (ECG) is recorded only for several seconds to minutes, it often misses or underestimates the underlying arrhythmia. The surface ECG is also easily influenced by depolarization potentials from skeletal muscle by the movement of patient (especially muscle tremor). However, holter monitoring is less affected by such factors. There has been no precedential report in veterinary medicine applying digital holter monitor with unipolar precordial chest lead using 4 electrodes. This article describes its clinical indications, equipment and technical application method in dogs.

• 대한임베디드공학회논문지
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• 제15권5호
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• pp.205-214
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• 2020

With the recent development of hardware and software technology, interest in the development of wearable devices is increasing. In particular, wearable devices require algorithms suitable for low-power and low-capacity embedded devices. Among them, there is an increasing demand for a signal compression algorithm that reduces communication overhead, in order to increase the efficiency of storage and transmission of electrocardiogram (ECG) signals requiring long-time measurement. Because normal beats occupy most of the signal with similar shapes, a high rate of signal compression is possible if normal beats are represented by a template. In this paper, we propose an algorithm for determining the normal beat template using the template cluster and Pearson similarity. Also, the template is expressed effectively as a few vertices through linear approximation algorithm. In experiment of Datum 234 of MIT-BIH arrhythmia database (MIT-BIH ADB) provided by Physionet, a compression ratio was 33.44:1, and an average distribution of root mean square error (RMSE) was 1.55%.

• Journal of Communications and Networks
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• 제16권4호
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• pp.465-474
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• 2014

Wireless sensor network (WSN) is considered to be one of the most important research fields for ubiquitous healthcare (u-healthcare) applications. Healthcare systems combined with WSNs have only been introduced by several pioneering researchers. However, most researchers collect physiological data from medical nodes located at static locations and transmit them within a limited communication range between a base station and the medical nodes. In these healthcare systems, the network link can be easily broken owing to the movement of the object nodes. To overcome this issue, in this study, the fast link exchange minimum cost forwarding (FLE-MCF) routing protocol is proposed. This protocol allows real-time multi-hop communication in a healthcare system based on WSN. The protocol is designed for a multi-hop sensor network to rapidly restore the network link when it is broken. The performance of the proposed FLE-MCF protocol is compared with that of a modified minimum cost forwarding (MMCF) protocol. The FLE-MCF protocol shows a good packet delivery rate from/to a fast moving object in a WSN. The designed wearable platform utilizes an adaptive linear prediction filter to reduce the motion artifacts in the original electrocardiogram (ECG) signal. Two filter algorithms used for baseline drift removal are evaluated to check whether real-time execution is possible on our wearable platform. The experiment results shows that the ECG signal filtered by adaptive linear prediction filter recovers from the distorted ECG signal efficiently.

• 융합신호처리학회논문지
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• 제3권1호
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• pp.27-32
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• 2002

본 논문에서 제안한 텔레미트리 시스템은 생체신호를 중거리로 전송하기 위한 RF 송신기와 전자파 간섭의 영향이 없는 광을 매체로한 수신기이다. 텔레미트리 시스템은 of 65$\times$125$\times$45mm크기이며, RF 송신부, 광 수신부와 생체신호 처리를 위한 CMOS 칩으로 구성되어 있다. 제안된 텔레메트리 장점은 전자파에 노출을 최소화하면서 중거리(50m) 텔레메트리가 가능하여, 자유로운 상태에서의 모니터링이 가능하다. 관측 시스템은 실시간 처리를 위해 dual-processor구조로 설계했다. 본 연구에서는 1 채널 360Hz, 16 Bits의 심전도 데이터를 1.42초 간격으로 실시간 웨이브렛 변환할 수 있었다.

• 한국정보통신학회논문지
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• 제18권8호
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• pp.2008-2016
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• 2014

최근 건강관리 및 심장질환 관리 등에 대한 관심이 증가하면서 유비쿼터스 헬스케어 서비스와 관련 기기에 대한 개발이 활발히 이루어지고 있다. 본 논문에서는 패치형 심전도 측정기기와 연동된 스마트폰으로 구성된 모바일 헬스케어 시스템을 개발하였다. 본 시스템은 실시간으로 심전도, 맥박, 스트레스 지수를 모니터링하고 저장 및 전송하는 기능과 심박 수에 따른 건강관리 기능 등을 제공한다. 이처럼 웨어러블 생체신호 측정 장치와 연동된 모바일 헬스케어 시스템을 통해 생체 신호를 지속적으로 모니터링함으로써 사용자는 만성질환을 예방하고 꾸준히 건강을 유지할 수 있다. 본 논문에서는 실제 플랫폼에 탑재되어 구현된 결과를 보여준다.

• 전기학회논문지
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• 제65권7호
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• pp.1252-1256
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• 2016

Internet of Things(IoT)-devices are now expanding inter-connecting networking technologies to invent healthcare monitoring system especially for assessing physiological conditions of the chronically-ill patients those with cardiovascular diseases. Hence, IoT system is expected to be utilized for home healthcare by dedicating the original usage of IoT devices to collect the biomedical data such as electrocardiogram(ECG) and photoplethysmography(PPG) signal. The aim of this work is to implement health monitoring system by integrating IoT devices with Raspberry-pi components to measure and analyze ECG and the multi-channel PPG signals. The acquired data and fiducial features from our system can be transmitted to mobile devices via wireless networking technology to support the concept of tele-monitoring services based on IoT devices.

• 대한한방부인과학회지
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• 제36권1호
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• pp.90-102
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• 2023

Objectives: The purpose of this study is to report the clinical effectiveness of Korean medicine treatment on postmenopausal syndrome. Methods: The patient with postmenopausal syndrome with palpitation was treated with Korean medicine treatment during 14 days of hospitalization. The patient received Korean medicine treatment including herbal medicine, acupuncture and moxibustion. The effect of treatment on postmenopausal syndrome was evaluated through the Numeric Rating Scale (NRS) and questionnaire. Palpitation and arrhythmia was evaluated by Electrocardiogram (ECG) and manual pulse diagnosis three times a day. Result: After the treatment, the clinical postmenopausal symptoms of palpitation and hot flush were improved. Also, ECG's result was improved ventricular premature contraction to normal ECG. Conclusions: This case report proved that the Korean medicine treatment may be effective for improving postmenopausal syndrome with palpitation and hot flush. However, further clinical study is needed in the future to prove the effectiveness of Korean medicine treatment for postmenopausal syndrome with palpitation and hot flush.

• Journal of Information Processing Systems
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• 제18권1호
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• pp.97-114
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• 2022

Interest is increasing in electrocardiogram (ECG) signal analysis for embedded devices, creating the need to develop an algorithm suitable for a low-power, low-memory embedded device. Linear approximation of the ECG signal facilitates the detection of fiducial points by expressing the signal as a small number of vertices. However, dynamic programming, a global optimization method used for linear approximation, has the disadvantage of high complexity using memoization. In this paper, the calculation area and memory usage are improved using a linear approximated template. The proposed algorithm reduces the calculation area required for dynamic programming through local optimization around the vertices of the template. In addition, it minimizes the storage space required by expressing the time information using the error from the vertices of the template, which is more compact than the time difference between vertices. When the length of the signal is L, the number of vertices is N, and the margin tolerance is M, the spatial complexity improves from O(NL) to O(NM). In our experiment, the linear approximation processing time was 12.45 times faster, from 18.18 ms to 1.46 ms on average, for each beat. The quality distribution of the percentage root mean square difference confirms that the proposed algorithm is a stable approximation.