Jeunwoo Lee

A wearable context aware system for ubiquitous healthcare.

Recent developments of information technologies are leading the advent of the era of ubiquitous healthcare, which means healthcare services at any time and at any places. The ubiquitous healthcare service needs a wearable system for more continual measurement of biological signals of a user, which gives information of the user from wearable sensors. In this paper, we propose a wearable context aware system for ubiquitous healthcare, and its systematic design process of a ubiquitous healthcare service. Some wearable sensor systems are introduced with Zigbee communication. We develop a context aware framework to send information from wearable sensors to healthcare service entities as a middleware to solve the interoperability problem between sensor makers and healthcare service providers. And, we propose a systematic process of design of ubiquitous healthcare services with the context aware framework. In order to show the feasibility of the proposed system, some application examples are given, which are applied to remote monitoring, and a self check service

Wearable Systems for Service based on Physiological Signals

Many researches for useful status information on humans have been done using the bio-signals. The bio-signal acquisition systems can be used to connect a user and a ubiquitous computing environment. The ubiquitous computing environment has to give various services anywhere, anytime. Consequently, ubiquitous computing requires new technology, such as a new user interface, dynamic service mechanism based on context and mobility support, which is different from technology used in desktop environment. To do this, we developed a wearable system, which can sense physiological data, determine emotional status and execute service based on the emotion. In this paper, we described wearable systems for personalized service based on physiological signals. The wearable system is composed of three subsystems, the physiological data sensing subsystem, the human status awareness subsystem and the service management subsystem. The physiological data sensing subsystem senses PPG, GSR and SKT signals from the data glove and sends the data to a wearable system using Bluetooth. The human status awareness subsystem in the wearable system receives the data from bio-sensors and determines emotional status using nonlinear mapping and rule-base. After determining emotion, the service management subsystem activates proper service automatically, and the service management subsystem can provide personalized service for users based on acquired bio-signals. Also, we presented various feature extraction using bio-signals such as PPG, GSR, SKT considering mobility, and emotion recognition of human status for the ubiquitous computing service

Cuffless and Non-Invasive Estimation of a Continuous Blood Pressure Based on PTT

This study suggests the method for measuring the BP (blood pressure) which it is one among the important vital sign of the human body with a cuffless and non-invasive. The monitoring of the BP is general to use the physical sensor which it directly contacts with the blood vessel in an operation, but this kind of a method can be impossible in the emergency requiring the rapid treatment. In a situation, to take a BP reading, most people use the device which is measured by inflating a cuff around the arm. However, it can measure with these method only the instantaneously BP but the continued BP cannot be shown. This paper shows the wrist type device is developed for the continuous BP measurement which is a non-invasive type. And after analyze and compare to BP data obtained by wearing the wrist type device and reference device, we present the possibility of the cuffless BP.

A media distribution system supporting priority-based QoS in a home network

In this paper, we present the design and implementation of a media distribution system supporting priority-based quality-of-service (QoS) in home networks. We adopt the DLNA home networked device interoperability guidelines and the UPnP QoS architecture for interoperability of multimedia networking and QoS management among networked devices, respectively. Additionally, we use the IEEE 802.1p/Q for a link-layer priority-based QoS scheme in an Ethernet-based home network. By combining the DLNA guidelines with the UPnP QoS architecture-cum-the 802.1p/Q QoS scheme and integrating them into a home gateway and multimedia devices, we offers not only interoperability of media distribution among different networked devices but also easy to use management of QoS for multimedia

The Wearable Wrist-Type Gadget for HealthCare based on Physiological Signals

In this paper we propose a wearable wrist type wireless gadget for personal services, especially healthcare service, based on physiological signals. The wrist-type gadget can process ECG, PPG, SKT, and PTT signals and can provide NIBP, HR, and stress level. The proposed wearable gadgets can be used for self-diagnosis, and real-time monitoring.

Management system for OSGi-based infrastructure

This paper describes a remote management system and its implementation to control and manage the OSGi-based infrastructure such as residential gateway, telematics terminal, or other embedded devices. The features of implemented management system include dynamic service, user interface, and static package tracking. In order to provide inter-operation between relevant entities such as a remote manager and a management agent, we design XML-based communication message. The management system described in this paper provides a simple foundation for a service provider to deliver and manage a wide range of a managed e-service based on the OSGi infrastructure

Data synchronization between adjacent user devices for personal cloud computing

This paper describes ad hoc data synchronization among devices for sharing contents. The purpose of this paper is to share user data in heterogeneous environments, without depending on central server. This technology can be applied to synchronize personal data between a device and a personal cloud storage for personal cloud services. The ad hoc synchronization needs sync agent service discovery module, user authentication module, network adapter, and application data synchronization module. The method described in this paper is better than existing synchronization technology based on client-server in availability, performance, and scalability quality attributes.

Management Agent for OSGi-based Healthcare Application Using Portable Information Terminal

This paper addresses a management agent for an OSGi-based healthcare application. For a distribution and administration of the OSGi-based healthcare application running on the portable information terminal, we need a management agent supporting dynamic deployment of component, control of components life cycle, adjustment of applications configuration, deployment of user profile for personalized service and etc. To support these requirements, we define XML-based descriptor and use it as control message. We also define and use SMS-based callback URL for initiating network connection. The object of this paper is providing methodology which can distribute/manage the various applications dynamically and resolve the network connection problem while we use a private IP address in the portable information terminal. This object is implemented as a management agent and SMS-based connection initialization.

Instant Notification Service for Ubiquitous Personal Care in Healthcare Application

This paper addresses why we need an instant notification service for a ubiquitous personal care in healthcare application and presents its prototype implementation. The implemented instant notification service has two major features: (1) the service is implemented as a thin client application from terminals perspective. Because healthcare terminals are usually small devices such as a PDA or a smart phone. (2) Two types of messages (text and voice message) are supported. This paper is one of implementations for practical ubiquitous personal care but we should consider the compatibility issue to link a standard healthcare industry in the future.

A Context Aware Framework for u-Healthcare in a Wearable System

A wearable system can be a key system for u-Healthcare, which means healthcare services at any time and at any places. A wearable system for u-Healthcare is composed of three parts: wearable computers, wearable sensor systems, and communication modules. A middleware is required in order to send the information gathered from wearable sensors to u-Healthcare service entities. The middleware should handle the problem of interoperability between information from sensors and u-Healthcare service entities. We develop a context aware framework as the middleware between wearable sensor systems and u-Healthcare service entities. An ontology based context model is designed for interoperability between context providing modules and u-Healthcare service entities. By using the same context model and the same API’s of the context aware framework in programming both context providing modules and u-Healthcare service entities, contexts from sensors can be sent to u-Healthcare service entities without the interoperability problem. In order to show the feasibility of the proposed system, some application examples are given, which are applied to a remote monitoring, and a self check service.