• 전자공학회논문지
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• 제54권4호
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• pp.44-49
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• 2017

헬스케어 및 의료분야를 위한 배터리 기반 웨어러블 디바이스가 많이 제품화되고 있으나, 효과적인 전력 관리 미흡으로 자주 충전해야 하는 사용자의 불편함이 존재한다. 본 연구에서는 HW에서 제공하는 전력 관리 회로도를 효과적으로 활용할 수 있는 Tickless 기반 운영체제 및 전력 관리 알고리즘을 제시하고, 보드 레벨에서 최소 전력을 소모하는 Cold Restart 기법을 제안한다. 제안된 기법의 운영체제는 기존 운영체제에 비해 웨어러블 디바이스의 응용을 모델링한 4가지 시나리오에서 2배에서 최대 33배의 전력 소모 절감을 가져왔다.

• 디지털융복합연구
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• 제19권11호
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• pp.525-536
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• 2021

본 연구는 웨어러블 헬스케어 디바이스 사용자의 지각된 가치(혁신적 가치, 실용적 가치, 상징적 가치)와 혁신 특성(혁신 저항, 가시성)이 구매 태도에 미치는 영향과 지각된 가격, 구매 태도가 고객만족도에 미치는 영향을 살펴보았다. 현재 웨어러블 헬스케어 디바이스를 사용하고 있는 실사용자를 대상으로 설문 조사를 실시하였고, 최종 201부를 SPSS 25와 SmartPLS 3.0을 사용하여 분석하였다. 연구 결과를 요약하면 다음과 같다. 첫째, 지각된 가치 중 혁신적 가치, 실용적 가치는 사용자의 구매 태도에 정(+)의 영향을 미치며, 상징적 가치는 사용자의 구매 태도에 영향을 미치지 않는 것으로 나타났다. 둘째, 혁신특성 중 혁신 저항은 사용자의 구매 태도에 부(-)의 영향을 미치는 것으로 나타났으며, 혁신특성 중 가시성은 사용자의 구매 태도에 영향을 미치지 않는 것으로 나타났다. 셋째, 지각된 가격은 사용자의 구매 태도에 정(+)의 영향을 미치는 것으로 나타났으며, 넷째, 지각된 가격과 구매 태도는 사용자의 고객 만족도에 정(+)의 영향을 미치는 것으로 본 연구를 통해 확인하였다. 이러한 연구 결과를 바탕으로 이론적 시사점과 실무적 시사점 및 향후 연구 방향을 제시하였다.

• 센서학회지
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• 제27권1호
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• pp.6-12
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• 2018

In this paper, a 32-variable pulse position modulation (32-VPPM) scheme is proposed to support a red-green-blue light-emitting-diode (RGB-LED)-based optical camera communication (OCC) system. Our proposed modulation scheme is designed to enhance the OCC data transmission rate, which is targeted for the wearable biomedical data monitoring system. The OCC technology has been utilized as an alternative solution to the radio frequency (RF) wireless system for long-term self-healthcare monitoring. Different biomedical signals, such as electrocardiograms, photoplethysmograms, and respiration signals are being monitored and transmitted wirelessly from the wearable biomedical device to the smartphone receiver. A common 30 frames per second (fps) smartphone camera with a CMOS image sensor is used to record a transmitted optical signal. Moreover, the overall proposed system architecture, modulation scheme, and data demodulation are discussed in this paper. The experimental result shows that the proposed system is able to achieve > 9 kbps using only a common smartphone camera receiver.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송∙미디어공학회 2016년도 추계학술대회
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• pp.154-156
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• 2016

현대사회에서 헬스케어가 대두하고 있는 동시에 자신의 몸 상태와 관련된 정보에 대해 직접 모니터링을 원하는 사람들이 늘어나고 있다. 이에, 본 논문에서는 사용자의 스마트한 건강관리를 위한 웨어러블 (wearable) 기기 및 어플리케이션을 개발한다. 사람의 발은 신체 건강과 밀접한 연관이 있으므로 개발된 시스템은 신발 내에 부착된 압력 및 온습도 센서를 통하여 발의 건강상태를 실시간으로 모니터링할 수 있다. 또한, 제안한 시스템은 하나의 신발에 내장되어 있으므로 사용자가 일상생활 중에 간편하게 발의 건강상태를 스스로 모니터링할 수 있다.

• Journal of Magnetics
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• 제22권1호
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• pp.150-154
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• 2017

A novel high precision spatial positioning method utilizing the electromagnetic momentum, i.e., Electromagnetic Momentum Positioning (EMP), is proposed in this paper. By measuring the momentum of the electromagnetic field around the small current loop, the relative position between the sensor and the current loop is calculated. This method is particularly suitable for the application of close-range and high-precision positioning, e.g., data gloves and medical devices in personal healthcare, etc. The simulation results show that EMP method can give a high accuracy with the positioning error less than 1 mm, which is better than the traditional magnetic positioning devices with the error greater than 1 cm. This method lays the foundation for the application of data gloves to meet the accurate positioning requirement, such as the high precision interaction in Virtual Reality (VR), Augmented Reality (AR) and personal wearable devices network.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2015년도 춘계학술발표대회
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• pp.712-713
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• 2015

IoT (Internet of Things)가 차세대 기술로 각광을 받으면서 않은 IT 전문인들이 대표주자인 웨어러블 디바이스(wearable device) 의 활용도에 많은 관심을 기울이고 있다. 하지만 현재까지 헬스케어(healthcare)와 피트니스(fitness) 서비스 중심으로 구성되는 등 다양성을 갖지 못하고 있다. 본 논문에서는 스마트 위치를 이용하여 장보기에 다양한 편리성을 제공하는 라이프스타일 관련 웨어러블 어플리케이션을 제안한다. 바코드 스캐닝 기능을 통하여 구매한 제품에 대한 정보를 자동으로 검출하여 가계부를 작성한다. 또한 고객에게 현재까지의 구매 내역에 기반하여 최적의 추천상품 목록을 구성하는 서비스도 제공한다.

• International journal of advanced smart convergence
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• 제5권3호
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• pp.32-39
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• 2016

With the help of a small wearable device, patients reside in an isolated village need constant monitoring which may increase access to care and decrease healthcare delivery cost. As the number of patients' requests increases in simultaneously manner, the web service gateway located in the village hall encounters limitations for performing them successfully and concurrently. The gateway based RESTful technology responsible for handling patients' requests attests an internet latency in case a large number of them submit toward the gateway increases. In this paper, we propose the design tasks of the web service gateway for handling concurrency events. In the procedure of designing tasks, concurrency is best understood by employing multiple levels of abstraction. The way that is eminently to accomplish concurrency is to build an object-oriented environment with support for messages passing between concurrent objects. We also investigate the performance of event-driven architecture for building web service gateway using node.js. The experiments results show that server-side JavaScript with Node.js and MongoDB as database is 40% faster than Apache Sling. With Node.js developers can build a high-performance, asynchronous, event-driven healthcare hub server to handle an increasing number of concurrent connections for Remote Healthcare Monitoring System in an isolated village with no access to local medical care.

• 대한의용생체공학회:의공학회지
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• 제43권6호
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• pp.399-408
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• 2022

Because arrhythmia occurs irregularly, it should be examined for at least 24 hours for accurate diagnosis. For this reason, this paper developed firmware software for arrhythmia detection and prevented consumption of temporal and human resources and enabled continuous management and early diagnosis. Prior to the experiment, the interval between the R peaks of the QRS Complex was calculated using the Pan-Tompkins algorithm. The developed firmware software designed and implemented an algorithm to detect arrhythmia such as tachycardia, bradycardia, ventricular tachycardia, persistent tachycardia, and non-persistent tachycardia, and a data transmission format to monitor the collected data based on BLE. As a result of the experiment, arrhythmia was found in real time according to the change in BPM as designed in this paper. And the data quality for BLE communication was verified by comparing the sensor's serial communication value with the Android application reception value. In the future, wearable devices for real-time arrhythmia detection will be lightweight and developed firmware software will be applied.

• 한국정밀공학회지
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• 제28권11호
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• pp.1330-1338
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• 2011

Social activities of the elderly have been increasing as our society progresses toward an aging society. As their activities increase, so does the occurrence of falls that could lead to fractures. Falls are serious health hazards to the elderly. Therefore, development of a device that can detect fall accidents and prevent fracture is essential. In this study, we developed a portable fall detection system for the fracture prevention system of the elderly. The device is intended to detect a fall and activate a second device such as an air bag deployment system that can prevent fracture. The fall detection device contains a 3-axis acceleration sensor and two 2-axis tilt sensors. We measured acceleration and tilt angle of body during fall and activities of daily(ADL) living using the fall detection device that is attached on the subjects'. Moving mattress which is actuated by a pneumatic system was used in fall experiments and it could provide forced falls. Sensor data during fall and ADL were sent to computer and filtered with low-pass filter. The developed fall detection device was successful in detecting a fall about 0.1 second before a severe impact to occur and detecting the direction of the fall to provide enough time and information for the fracture preventive device to be activated. The fall detection device was also able to differentiate fall from ADL such as walking, sitting down, standing up, lying down, and running.

• Healthcare Informatics Research
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• 제24권4호
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• pp.387-393
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• 2018

Objectives: This paper describes an experience of implementing seamless service trials online and offline by adopting Internet of Things (IoT) technology based on near-field communication (NFC) tags and Bluetooth low-energy (BLE) beacons. The services were provided for both patients and health professionals. Methods: The pilot services were implemented to enhance healthcare service quality, improve patient safety, and provide an effective business process to health professionals in a tertiary hospital in Seoul, Korea. The services to enhance healthcare service quality include healing tours, cancer information/education, psychological assessments, indoor navigation, and exercise volume checking. The services to improve patient safety are monitoring of high-risk inpatients and delivery of real-time health information in emergency situations. In addition, the services to provide an effective business process to health professionals include surveys and web services for patient management. Results: Considering the sustainability of the pilot services, we decided to pause navigation and patient monitoring services until the interference problem could be completely resolved because beacon signal interference significantly influences the quality of services. On the other hand, we had to continue to provide new wearable beacons to high-risk patients because of hygiene issues, so the cost increased over time and was much higher than expected. Conclusions: To make the smart connected hospital services sustainable, technical feasibility (e.g., beacon signal interference), economic feasibility (e.g., continuous provision of new necklace beacons), and organizational commitment and support (e.g., renewal of new alternative medical devices and infrastructure) are required.