• International journal of advanced smart convergence
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• 제6권2호
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• pp.16-23
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• 2017

In contemporary modern society, people are constantly exposed to many kinds of noise, such as that from machinery, aircraft, construction sites, or road traffic. Noise is considered one of the most indispensable and influential parts of human life. This study investigates the acoustic characteristics of noise transfer from external sources to the human ear. For this study, we measured and analyzed various types of noise environments, installed monitoring speakers in a semi-anechoic room, and conducted intentional noise-filled experiments. In this environment, the size of the sounds generated by use of a portable device was also measured and the SNR (signal to noise ratio) calculated to study the influence of the noise. As sound is transmitted to the ear and the human body, it affects not only auditory damage but also other parts of the body. In this paper, we propose a proper SNR for noise emitted by portable IT equipment to prevent hearing loss when IT equipment is used.

• 한국정밀공학회지
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• 제19권12호
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• pp.179-184
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• 2002

In this study, we developed a portable device which can monitor and analyze vibration signals from machines. This system consists a PDA loading the program for vibration analysis and A/D board for vibration acquisition. A PDA is smaller than the palm of the hand, but it has a powerful computing ability as much as an IBM compatible PC with a Pentium 100MHz CPU. The A/D board developed in this study supports LAN interface using TCP/IP communication protocol. The application program for vibration analysis includes signal processing module, fault diagnosis module, data store module, and plot display module. MS visual embedded C＋＋ 3.0 was used to developed the program.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1986년도 하계학술대회논문집
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• pp.192-197
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• 1986

The device that we are developing is a microprocessor-based, portable arrhythmia monitor that ultimately will need processing algorithm similar to those found now in monitoring systems in the cardiac care unit of today's hospital. Our initial goal is to replace the functions of the Holter tape recorder, the current device of choice for determining if an ambulatory patient has potential heart disease.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.389.1-389.1
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• 2016

The flexible solid state device has been widely studied as portable and wearable device applications such as display, sensor and curved circuits. A zero-bias operation without any external power consumption is a highly-demanding feature of semiconductor devices, including optical communication, environment monitoring and digital imaging applications. Moreover, the flexibility of device would give the degree of freedom of transparent electronics. Functional and transparent abrupt p/n junction device has been realized by combining of p-type NiO and n-type ZnO metal oxide semiconductors. The use of a plastic polyethylene terephthalate (PET) film substrate spontaneously allows the flexible feature of the devices. The functional design of p-NiO/n-ZnO metal oxide device provides a high rectifying ratio of 189 to ensure the quality junction quality. This all transparent metal oxide device can be operated without external power supply. The flexible p-NiO/n-ZnO device exhibit substantial photodetection performances of quick response time of $68{\mu}s$. We may suggest an efficient design scheme of flexible and functional metal oxide-based transparent electronics.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 심포지엄 논문집 정보 및 제어부문
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• pp.51-53
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• 2006

This paper proposes a portable ECG monitoring system, which integrates uptodate PDA and RF communication technology. The aim of the study is to acquire the subject's biomedical signal without any constraint. It has two types of transmission mode, which are total signal transmission mode and HR(heart rate)/SC(step count) transmission mode. In audition, wireless communication technology uses Zigbee Wireless PAN and can work in low-power mode, which is one of the advantages of ZiBbee communication technology. The developed system is composed of a transmitter and a receiver. The transmitter has three-axial acceleration sensor. ECG amplifier and Zigbee communication controller. In total signal transmission mode, it can send data 50 packets per second whose transmission speed corresponds to 300 ECG samples and 60 acceleration samples. In HR/SG transmission mode, it can calculate heart rate from EEG data with 216 samples per second and step count from acceleration data and send a packet every cardiac cycle. The receiver forwards the received data to PDA, where the data can be stored and displayed. Therefore, the developed device enables to continuous monitoring for Activities of Daily Living(ADL). Also, this method will reduce medical costs in the aged society.

• International Journal of Computer Science & Network Security
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• 제22권1호
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• pp.269-275
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• 2022

Public healthcare has recently become an issue of great importance due to the exponential growth in the human population, the increase in medical expenses, and the COVID-19 pandemic. Speed is one of the crucial factors in saving life, particularly in case of heart attack. Therefore, a healthcare device is needed to continuously monitor and follow up heart health conditions remotely without the need for the patient to attend a medical center. Therefore, this paper proposes a portable electrocardiogram (ECG) monitoring system to improve healthcare for heart attack patients in both home and ambulance settings. The proposed system receives the ECG signals of the patient and sends the ECG values to a MySQL database on the IoT-cloud via Wi-Fi. The signals are displayed as an ECG data chart on a webpage that can be accessed by the patient's doctor based on the HTTP protocol that is employed in the IoT-cloud. The proposed system detects the ECG data of the patient to calculate the total number of heartbeats, number of normal heartbeats, and the number of abnormal heartbeats, which can help the doctor to evaluate the health status of the patient and decide on a suitable medical intervention. This system therefore has the potential to save time and life, but also cost. This paper highlights the five main advantages of the proposed ECG monitoring system and makes some recommendations to develop the system further.

• 전기학회논문지
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• 제58권6호
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• pp.1186-1193
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• 2009

Wearable ECG monitoring is regarded as one of the most essential part in the ubiquitous healthcare environment and subsequently day-life monitoring of a heart condition has been pursued especially for the elder people. However, there are many problems to accomplish this task such as; i) implementation of long-term monitoring device, ii) development of non-irritating electrode on skin and iii) stable signal acquisition. With these aims, we have focused on implementing a non-irritating electrode with an endurable monitoring device for day-life. To accomplish our tasks, we basically developed four different types of textile electrodes that are adapted by both shape and the composed material; flat or convex shape and Ag-conductive paste material or not. It turns out to be that a convex shape and Ag-paste textile electrode has the best performance in terms of both signal-to-noise ratio (SNR) and Impedance/Phase characteristics. Furthermore, ECG amplifier (35 ${\times}$ 35 mm) has developed to resolve the ECG signal and transfer the signal to desktop computing device or portable one by RF serial communication.

• 제어로봇시스템학회논문지
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• 제15권4호
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• pp.406-412
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• 2009

ECG is used on purpose to keep good health or monitor cardiac function of aged person as well as on purpose to diagnose the disease of heart patients. The ambulatory ECG monitoring system under guarantee of safety and accuracy is very efficient to prevent the progress of heart disease and sudden death. These systems can detect the temporary change of ECG that is very significant to diagnose heart disease such as myocardial ischemia, arrhyamia and cardiac infarction. In this paper, we describe the ECG signal analysis algorithm and measurement device for ECG monitoring. The authors designed a small-size portable ECG device that consisted of instrumentation amplifier, micro-controller, filter and RF module. The device measures ECG with four electrodes on the body and detects QRS complex and ST level change in realtime. Also it transmits the measured signals to the personal computer. The developed software for ECG analysis in personal computer has the function to detect the feature points and ST level changes.

• 대한전자공학회논문지TC
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• 제47권10호
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• pp.17-26
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• 2010

본 논문은 와이브로 휴대기기를 이용한 차량의 운행, 고장, 이상 정보의 모니터링 기술에 관한 것으로서, 차량 내부 망(In-Vehicle Network)에 연결된 엔진, 트랜스미션, 브레이크, 에어백 등의 제어장치인 ECU(Electronics Control Unit) 및 각종 센서들로부터의 데이터 획득을 위해 차량내의 OBD-II(On-Board Diagnostics) 커넥터에 차량 정보 수집 장치를 연결한다. 또한, 와이브로 휴대기기(휴대폰, PDA, PMP, UMPC 등)에 차량 진단 프로그램을 탑재하여 차량 주행 중에 발생되는 운행, 고장, 이상 정보를 실시간으로 수집 및 분석하여 이상 징후 발생 시 알림 메시지를 발생하여 차량의 이상에 대해 신속히 대처할 수 있다. 이와 동시에, 휴대기기를 통해 수집된 차량 정보 데이터는 와이브로망을 통해 차량 관리 전문회사의 서버로 전송되어 체계적인 차량 관리에 활용될 수 있어 차량에 대한 지식이나 상식이 부족한 모든 운전자에게 차량 관리에 대한 편리함을 제공하여 안전운전 및 경제운전 등의 서비스를 제공할 수 있다. 차량 진단 장치와 유선으로 연결하는 경우 와이어링 하네스에 의한 각종 노이즈가 유입되어 커넥터 내구성이 나빠져 우려가 상존한다. 이러한 어려움을 해결하고자 본 연구에서는 차량에 탑재되는 차량 정보 수집 장치와 운전자가 사용 중인 개인의 와이브로 휴대기기로 차량 진단 및 모니터링이 가능한 시스템을 구성 하였고, 차량 정보 및 상태 자료 공유 연통 플랫폼의 정의에 따른 시스템에 있어서 자료의 획득 및 연동기술을 연구하였다.

• 한국항행학회논문지
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• 제18권6호
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• pp.625-632
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• 2014

유헬스 서비스는 사물인터넷 장치와 스마트 기기와 같은 모바일 장치를 사용하기 때문에 휴대가 간편한 소형 컴퓨팅 장치로 구성되어 있으며, 기존 컴퓨터에서 수행하던 작업을 동시에 수행할 수 있다. 환자의 생체정보를 이동통신망 환경에서 의료진과 환자 및 환자의 가족의 스마트기기로 실시간으로 전달할 수 있도록 bluetooth HDP기반의 메시지 구조를 사용하였다. ISO/IEEE 11073 PHD 표준을 기반으로 agent와 manager 사이의 통신 방법을 정의하였다. 의료진과 환자 및 환자의 가족이 스마트 기기를 통하여 실시간으로 확인할 수 있도록 안드로이드 기반의 모니터링 애플리케이션을 구현하여 일상생활에서 사용되고 있는 스마트 기기에서 동작을 확인함으로써 생체정보의 원활한 송수신을 확인하였다.