• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.815-816
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• 2006

In this paper, an EMG (Electromyography) sensor for utilizing an EMGl-based HCI are described. The EMG sensor is a dry type and has high gain (1000-10000). Therefore, this sensor can be properly applied to HCI devices using EMG signals without additional amplification circuit.

• Journal of the Korea Society of Computer and Information
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• v.10 no.6 s.38
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• pp.117-126
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• 2005

In this paper, it was suggested method to recognize the motion of a person(lying, sitting, walking, running) using fuzzy inference and wireless biologic signal processing system. These are to Perceive the motion of the person. Furthermore, the information of motion is indispensable parameter for Context Awareness (CA). In the present study, ADXL 202JE accelerometer sensor was used to measure for checking the continuance motion, biological quantify of motion, and motion pattern of a Person. The measured data was transmitted to CA server by Radio Frequency(RF). From the present result, we confirmed that it is difficult to decide the motion of walking and running with only the magnitude of the Longitudinal Accelerometer Average Value(LAAV) and moreover the covariance of LAAV in any block is very useful for CA of walking and running.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.10a
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• pp.463-467
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• 2000

In this paper, we have implemented the Web Server Patient Monitoring System using PPP. It is composed of two parts. The first part is the Analog board for acquiring ECG signals. The second part is the module for processing and transmitting the acquired signal. The second part is using PPP for dial-up networking, TCP/IP for Internet, HTTP for web browser and JAVA program for a Patient Monitoring Program in one chip. In home, it is not need to establish another network line because it uses a telephone line. And a user who want to monitor a patient's biosignal can monitor a patient without wholly open network because it is the network sewer. The Patient Monitoring Program runs on a web browser by downloaded JAVA codes when a user connect to this system. It can make the Home Patient Monitoring Program decrease cost. It can help to avoid the limitation of monitoring a patient.

• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.1
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• pp.29-38
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• 2023

Although the biosignal is the best way to represent the human condition, it is difficult to acquire the biosignal of a driver driving for detecting driver's condition. As one of the methods to overcome this limitation, this paper proposes a driving stress monitoring system based on information provided by OBD-II(on-board diagnostics version II). The driving information and EDA(Electrodermal activity) data are obtained through the OBD-II scanner and E4 wristband, respectively. EDA data is used as ground truth to distinguish whether driver is stressed or not. MLP(multi-layer perceptron) neural network is used as a model to detect driving stress and is trained using driving data for about a month. To evaluate the proposed system, we used about 1 hour of driving data and the accuracy is 92%.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2009.11a
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• pp.58-61
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• 2009

최근 직물전극을 의복에 적용하여 의복을 착용한 상태에서 심전도, 심박과 같은 생체신호를 측정하는 방법이 다양하게 연구되고 있다. 그러나 대부분 직물전극의 경우, 높은 임피던스와 피부-전극 간의 불안정한 접촉으로 인해 생체신호를 측정하는 것은 매우어렵다는 문제점들이 지적되어 왔다. 이 논문에서는 피부-전극 간의 접촉을 향상시키기 위한 전극의 구조를 고안하여 의복에 적용함으로써, 착용자의 피부와 직물전극간의 접촉을 안정화 시킨 후, ECG(Electrocardiogram)를 측정하였다. 본 연구의 실험에 사용한 전극의 특성 분석 방법으로는 전극의 임피던스와 그에 따른 ECG 를 측정하여 SNR 분석을 실시하였다. 직물전극의 두 가지 구조와 직물전극과 트랜스미터 연결 스냅간 접촉 방식에 따른 ECG 측정을 비교한 결과, 전극 구조와 전도성 paste 사용 여부는 모두 ECG 측정에 영향을 미쳤다.

• Proceedings of the KIEE Conference
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• 2008.04a
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• pp.135-136
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• 2008

본 연구에서는 USB(Universal Serial Bus)통신과 전기적 절연을 이용하여 생체신호계측이 가능한 USB 데이터 수집(DAQ, Data acquisition)보드를 설계 및 구현한 것이다. 대부분의 데이터 수집보드는 전기적 절연이 되어 있지 않기 때문에 의용계측에 있어서 적합하지 않다. 보드를 평가하기 위해 설계한 USB DAQ 보드와 PC를 사용하여 사인파와 램프신호 그리고 생체신호중 하나인 ECG 신호를 측정하였다. 제안한 USB 데이터 수집보드는 AD변환부, 전기적 절연부, 전송부, 디지털 입 출력부 그리고 DC-DC변환기(DC DC Convertor)로 구성되었고, 최대 1KHz의 샘플링 주파수와 12비트 분해능과 8채널의 성능을 가진다.

• Journal of the Ergonomics Society of Korea
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• v.21 no.2
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• pp.59-70
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• 2002

This paper is about the evaluation of stress response and recovery using biosignals and fuzzy theory. We caused mental stress by means of a coin-stacking task. During the experiment, 4 kinds of biosignals, including frontalis EMG, ECG, peripheral skin temperature and skin conductance level, were acquired. Then, the degree of stress was assessed by synthetically those signals using fuzzy inference. From the fuzzy inference result, the parameters (amount of physiological change / amount of imposed stress) and (time to 25% recovery), which represent response and recovery respectively, were derived. We made a two-dimensional point graph using the response parameter as an abscissa and the recovery parameter as an ordinate for each subject.

• Proceedings of the KOSOMBE Conference
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• v.1997 no.05
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• pp.426-429
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• 1997

This paper describes the relationship among physiological, behavioral signal, and subjective evaluation depending on arousal level. Nz and reaction time hall similar pattern with KSS level, but eyeblink rate was different from these two parameters. Eyeblink rate increased slowly from KSS level 1 to 5, and had high increasing rate at KSS 7. But it showed steep descent at KSS level 9. From the result of reaction time test, since human performance was decreased rapidly above the KSS level 5, it is desirable to give a subject some stimulus such as sound or aroma to rise arousal level above the KSS level 3.

• Proceedings of the KIEE Conference
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• 2005.10b
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• pp.370-372
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• 2005

Inconveniences which might arise in transmitting measured biological data based on cable protocols generally are recognized critical points in tele-monitoring environment and also restrict the mobility of the user. a. Especially, activity monitoring which is importantly recognized as a core parameter in ubiquitous healthcare arena and weight management, pervasive and wireless measuring technology is most needed. In this paper, we would like to suggest lower power, miniaturized communication system in order to solve the above problems. The suggested system is powered by small coin-size battery. Also, The suggested system is compared with a blue-tooth module which is generally available in the commercial market. Even though, the suggested system didn't have higher transmission rate, its low power consumption make the suggested system would be feasible in ubiquitous monitoring of biological signals in ubiquitous healthcare arena.

• ETRI Journal
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• v.28 no.1
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• pp.111-114
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• 2006

An alternative human interface enabling people with severe motor disabilities to control an assistive system is presented. Since this interface relies on the biosignals originating from the contraction of muscles on the face during particular movements, even individuals with a paralyzed limb can use it with ease. For real-world application, a dedicated hardware module employing a general-purpose digital signal processor was implemented and its validity tested on an electrically powered wheelchair. Furthermore, an additional attempt to reduce error rates to a minimum for stable operation was also made based on the entropy information inherent in the signals during the classification phase. In the experiments, most of the five participating subjects could control the target system at their own will, and thus it is found that the proposed interface can be considered a potential alternative for the interaction of the severely disabled with electronic systems.