Dae-Young Kim

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Wireless body area networks (WBANs) provide communication services in the vicinity of the human body. Since the WBAN services consists of both medical and consumer electronics (CE) applications, MAC protocols in the WBAN should be designed considering flexibility and different characteristics between medical and CE applications. In this paper, we propose a(More)
SUMMARY WBANs provide communication services in the vicinity of the human body. Since WBANs utilize both MICS frequency band for implant medical applications and ISM frequency band for medical and consumer electronics (CE) applications, MAC protocols in WBAN should be designed considering flexibility between medical and CE applications. In this letter, we(More)
Data routing in wireless sensor networks must be energy-efficient because tiny sensor nodes have limited power. A cluster-based hierarchical routing is known to be more efficient than a flat routing because only cluster-heads communicate with a sink node. Existing hierarchical routings, however, assume unrealistically large radio transmission ranges for(More)
Wireless Body Area Networks (WBANs) provide a network communication service within the vicinity of a human body. Since WBANs must provide both medical and Consumer Electronics (CE) services at the same time, the MAC protocol in WBANs must satisfy the requirements of each service, especially hwen considering the need for immediate and reliable data(More)
—— This paper proposes a power management technique for video playback in mobile multimedia devices, which combines low-power video decoding and QoS-guaranteed algorithms: ILI (Interval-based Linear Interpolation) and QLB (QoS-guaranteed and Low-power Buffering). First, the proposed ILI algorithm precisely estimates the decoding time of video frames through(More)
A Wireless Body Area Networks (WBAN) is a communication network that provides both medical and consumer electronics (CE) services by using sensor devices in, on, or around a human body. To provide reliable communication with low power consumption for in-body communication, the IEEE 802.15.6 provides Medical Implant Communication Service (MICS) band and(More)
In a wireless sensor network, sensor nodes are deployed in an ad hoc fashion and they deliver data packets using multihop transmission. However, transmission failures occur frequently in the multihop transmission over wireless media. Thus, a loss recovery mechanism is required to provide end-to-end reliability. In addition, because the sensor nodes are very(More)
Cooperative communications are adopted as a promising solution to achieve high data rate over large areas in the future 4G wireless system, and the relay station (RS) is the key concept in cooperative communications. However, most existing works in this area focus only on optimal RS selections. In addition, there are only few works consider another crucial(More)