Dong-Oh Kang

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

UPnP AV architectural multimedia system with a home gateway powered by the OSGi platform

The key issue of multimedia systems in home network environment is interoperability among different kinds of multimedia devices. And, as for multimedia content providers outside a home, another issue of multimedia systems in home network environment is how to provide the multimedia service from the outside of a home. We developed a UPnP AV architectural multimedia system with a home gateway powered by the OSGi platform, which gives interoperability among multimedia home devices in home network environment, and a powerful tool for multimedia content providers to provide smarter multimedia service for users in a home.

A Systematic Design Tool of Context Aware System for Ubiquitous Healthcare Service in a Smart Home

Recent developments of information technologies are leading the advent of the era of ubiquitous healthcare service, which means healthcare services at any time and at any places. In a home, the ubiquitous healthcare service requires some context aware system for smart services using home network. In this paper, we propose a systematic design tool of a context aware system for ubiquitous healthcare service in a smart home, which is composed of a home gateway, a home server, a PDA, home network healthcare devices, and wearable sensors. We developed a context aware framework to send information from wearable sensors or healthcare devices to healthcare service entities as a middleware to solve the interoperability problem among sensor makers and healthcare service providers. And, we propose a design tool of ubiquitous healthcare services with the context aware framework in a systematic way. In order to show the feasibility of the proposed system, an application example is given, which is applied to a self check service.

An UPnP based Media Distribution System supporting QoS in a Converged Home Network

In this paper, we present the design and implementation of an UPnP based media distribution system supporting priority-based quality-of-service (QoS) in a home network that converges data and multimedia traffic. We adopt two UPnP based standards, the UPnP AV architecture and the UPnP QoS architecture, for multimedia networking and QoS management among networked devices, respectively. Additionally, the IEEE 802.1p/Q is adopted as a priority-based QoS scheme for an Ethernet-based home network. By combining two adopted architectures with the 802.1p/Q QoS scheme and integrating them into a home gateway and multimedia devices, our system offers not only interoperability of media distribution among different networked devices but also easy to use management of QoS for multimedia

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

A context aware system for personalized services using wearable biological signal sensors

In this paper, we propose a context aware system for personalized services using wearable biological signal sensors, by which a user can be provided with a personalized services via a user terminal device on the basis of information of userpsilas stress level derived from biological signals measured using biological signal sensors, and usage behavioral habits of services by a user. The system of this paper is composed of a user terminal device, wearable biological signal sensors, and service providers connected with a user terminal device through external public network. Wearable biological signal sensors are connected with a user terminal device via WPAN communication technology. Stress level of a user is calculated using biological signal sensor values when a service is selected and used by a user. And, userpsilas usage behavioral habits of a service are tracked, like usage time, usage duration, and usage frequency, etc. The gathered information is used to derive userpsilas preference of a service. By using the system mentioned above, a user can be provided with a personalized service which is given on most preferred time, and adjusted to fit a userpsilas preference. To show the feasibility of the proposed system, we apply the system to the music recommendation service.

Peer to peer signal strength characteristic between IoT devices for distance estimation

The Received Signal Strength Indication (RSSI) value of Bluetooth can be used to estimate distance between Internet of Things (IoT) devices. IoT devices, within Wireless Body Area Network (WBAN) area, can recognize each other in office environment automatically. Peer to peer distance estimation using the RSSI of Bluetooth is difficult because of large deviation of RSSI value. This paper describes the experimental results of RSSI measurement between IoT devices in office environment. And it applies the Low Pass Filter (LPF) to reduce the deviation of RSSI value. In east direction, when RSSI raw data is used, there is an overlap region, 23dBm, between WBAN area and outside of WBAN area. However, when LPF data is used, there is a gap about 1.7dBm. So, we can estimate distance using Bluetooth RSSI LPF data whether the IoT device is within WBAN area or not.

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.

Implementation of MPEG2-TS streaming system over wireless 1394 network

Wireless 1394 is an emerging technology for enabling wireless AV streaming. Wireless 1394 specification integrates the IEEE 1394 standard and the wireless access technology for broadband home networking. In this paper, we present the implementation of Wireless 1394 and MPEG2-TS streaming system over Wireless 1394 network. The implemented MPEG2-TS streaming system consists of a MPEG2-TS stream, a home server, a client PC, a wireless 1394 network and an UPnP based multimedia streaming application. The experimental results show that our system performs SD level MPEG2-TS streaming over wireless 1394 network successfully.

SDIF: Social device interaction framework for encounter and play in smart home service

In this paper, a framework for the mutual interaction of smart devices used in a smart home service is proposed by utilizing the concept of device sociality to minimize human interventions. The framework makes easy device collaboration possible by providing social relations among devices when they encounter each other. To measure the effect of the reduction in human intervention during the process of configuring the mutual interactions of such devices, a zero configuration index of the mutual interaction processes among smart devices was adopted. To show its feasibility in terms of minimizing human intervention, the proposed method was compared with another traditional device interaction protocol for a file and screen sharing application between two smart devices.