The Experts below are selected from a list of 11490 Experts worldwide ranked by ideXlab platform

Seong-cheol Kim - One of the best experts on this subject based on the ideXlab platform.

  • VTC Spring - Ultra WideBand Channel Characteristics for Body Area Network
    2014 IEEE 79th Vehicular Technology Conference (VTC Spring), 2014
    Co-Authors: Jeongwook Kim, Young-joon Kim, Seong-cheol Kim
    Abstract:

    Body Area Network considering the external Areas of human Body is a promising new application. In order to develop efficient Body Area Network system, a communication channel modeling is essential. However, there are few models considering the effect of human Body. This paper reports the empirical Ultra wideband(UWB) channel model for Body Area Network. Using the frequency domain measurement system, channel responses in anechoic chamber have been obtained. From the measurement results, the path loss property has been configured to the propagation environments. Furthermore the frequency dependent UWB channel correlation characteristics are investigated.

Ryuji Kohno - One of the best experts on this subject based on the ideXlab platform.

  • channel model on various frequency bands for wearable Body Area Network
    IEICE Transactions on Communications, 2009
    Co-Authors: Kenichi Takizawa, Takahiro Aoyagi, Norihiko Katayama, L I Huanbang, Jun-ichi Takada, Ryuji Kohno
    Abstract:

    Body Area Network (BAN) is considered as a promising technology in supporting medical and healthcare services by combining with various biological sensors. In this paper, we look at wearable BAN, which provides communication links among sensors on Body surface. In order to design a BAN that manages biological information with high efficiency and high reliability, the propagation characteristics of BAN must be thoroughly investigated. As a preliminary effort, we measured the propagation characteristics of BAN at frequency bands of 400MHz, 600MHz, 900MHz and 2400MHz respectively. Channel models for wearable BAN based on the measurement were derived. Our results show that the channel model can be described by using a path loss model for all frequency bands investigated.

  • Performance Evaluation of IEEE 802.15.4 for Wireless Body Area Network (WBAN)
    2009 IEEE International Conference on Communications Workshops, 2009
    Co-Authors: Ryuji Kohno
    Abstract:

    IEEE 802.15.4 is a current major technology for low-rate low-power wireless Networks. To study the applicability of IEEE 802.15.4 over a wireless Body Area Network (WBAN), in this paper we evaluate its three different access schemes' performance through several metrics. Considering the coexistence of contention access period (CAP) and contention-free period (CFP), we also study the mutual influences of these two traffics. The results show the unslotted mode has better performance than the slotted one in terms of throughput and latency but with the cost of much power consumption. In addition, the guaranteed time slot (GTS) in CFP can not guarantee the successful transmission of the CFP frames without sufficient GTS allocation. Finally, we give the suggestions for the novel medium access control (MAC) design for a WBAN.

  • r d and standardization of Body Area Network ban for medical healthcare
    International Conference on Ultra-Wideband, 2008
    Co-Authors: Ryuji Kohno, Kiyoshi Hamaguchi, Kenichi Takizawa
    Abstract:

    A new major application of UWB is medical healthcare using advantages of low power spectrum density, high capacity of transmission and accurate ranging. As a core Network of medical healthcare based on ICT, i.e. medical ICT, a Body Area Network (BAN) has been researched and developed. BAN can provide a wide range of applications in primary for medical healthcare such as tele-metering vital sign, e.g. ECG, EEG, tele-controlling medical equipment, e.g. capsule endoscope and in addition for non-medical service such as entertainment. To harmonize with the strong demands from both medical healthcare societies and ICT industries, a standardization committee referred to as IEEE 802.15.6 was formally set up in December 2007. The objective of 15.6 is to define new physical (PHY) and media access control (MAC) layers for wireless BAN (WBAN). This invited paper introduces a progress of research and development of Body Area Network, i.e. BAN and its standardization in IEEE802.15.6 in a field of medical ICT in order to encourage global collaboration as well as planting many R&D and business seeds in academia and industry.

  • Body Area Network and Its Standardization at IEEE 802.15.MBAN
    2007 16th IST Mobile and Wireless Communications Summit, 2007
    Co-Authors: Huan-bang Li, Bin Zhen, Kenichi Takizawa, Ryuji Kohno
    Abstract:

    Wireless communication Networking technologies play an important role in supporting ubiquitous Networks. Body Area Network (BAN) is a small-scale wireless communication Network, which is considered as a potential technology to provide extremely high quality and convenience for people in a more direct manner. This paper foresees some aspects of BAN. Possible application Areas and usage models are overviewed. Some wireless communication technologies are compared for their suitability in supporting BAN. Moreover, a prototype BAN was developed for transmission of three-dimensional accelerating data. Finally, a group of IEEE 802.15.MBAN for standardization on medical BAN is introduced. Some activities of this group are reviewed.

  • UWB antenna for wireless Body Area Network
    2006 Asia-Pacific Microwave Conference, 2006
    Co-Authors: Kamya Yekeh Yazdandoost, Ryuji Kohno
    Abstract:

    Wireless Body Area Network for sensing and monitoring of vital signs is the one of most rapid growing wireless communication system. A key component of wireless Body Area Network is an antenna. It must meet biocompatible and size- limit requirements. Therefore, antenna for wireless Body Area Network faces numerous RF challenges. We used an antenna with two layers of substrate to cancel the effect of human Body on antenna performance. In this paper we present an UWB antenna performance in the free space, on direct contact with human Body and way out to reduce the effect of human Body on antenna performance without any changes on antenna design.

Jenn-hwan Tarng - One of the best experts on this subject based on the ideXlab platform.

  • A Novel Folded UWB Antenna for Wireless Body Area Network
    IEEE Transactions on Antennas and Propagation, 2012
    Co-Authors: Cheng-hung Kang, Sung-jung Wu, Jenn-hwan Tarng
    Abstract:

    A novel folded ultrawideband antenna for Wireless Body Area Network (WBAN) is proposed, which can effectively reduce the backward radiation and proximity effects of human bodies. The proposed antenna has a low-profile 3D structure that consists of a bevel-edge feed structure and a metal plate with folded strip. The bevel edge feed structure achieves broadband impedance matching and the metal plate acts as the main radiator. Moreover, the folded strip not only extends the lower frequency band but also provides additional resonant frequency around 6 GHz. The final bandwidth covers from 3.1 GHz to 12 GHz. The proposed antenna shows the directional patterns with low backward radiation due to the patch-like structure and the ground plane also prevents from the proximity effects of human bodies. Furthermore, the simulated SAR values of the proposed antenna are lower than the values of omnidirectional disc planar monopole. These features demonstrate that the proposed antenna is suitable for WBAN application.

Jeongwook Kim - One of the best experts on this subject based on the ideXlab platform.

  • VTC Spring - Ultra WideBand Channel Characteristics for Body Area Network
    2014 IEEE 79th Vehicular Technology Conference (VTC Spring), 2014
    Co-Authors: Jeongwook Kim, Young-joon Kim, Seong-cheol Kim
    Abstract:

    Body Area Network considering the external Areas of human Body is a promising new application. In order to develop efficient Body Area Network system, a communication channel modeling is essential. However, there are few models considering the effect of human Body. This paper reports the empirical Ultra wideband(UWB) channel model for Body Area Network. Using the frequency domain measurement system, channel responses in anechoic chamber have been obtained. From the measurement results, the path loss property has been configured to the propagation environments. Furthermore the frequency dependent UWB channel correlation characteristics are investigated.

John L. Volakis - One of the best experts on this subject based on the ideXlab platform.

  • A Wireless Body Area Network for carefree medical sensing
    2014 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2014
    Co-Authors: Konstantinos Karathanasis, Asimina Kiourti, John L. Volakis
    Abstract:

    A Medical Sensing Body Area Network (MS-BAN) is designed and tested to connect with a lung-imaging sensor. The proposed MS-BAN can add wireless connectivity to a variety of other sensors. It is demonstrated that a wireless connection platform along with a RF power detector circuit can be used in conjunction with a lung-imaging sensor to provide deep tissue sensing and communication.

  • Pulmonary edema monitoring sensor with integrated Body-Area Network for remote medical sensing
    IEEE Transactions on Antennas and Propagation, 2014
    Co-Authors: Safa Salman, Erin Colebeck, Asimina Kiourti, Zheyu Wang, Erdem Topsakal, John L. Volakis
    Abstract:

    A wearable health monitoring sensor integrated with a Body-Area Network is presented for the diagnosis of pulmonary edema. This sensor is composed of 17 electrodes with 16 ports in-between and is intended to be placed on the human chest to detect lung irregularities by measuring the lung's average dielectric permittivity in a non-invasive way. Specifically, the sensor's active port is fed by a 40 MHz RF signal and its passive ports measure the corresponding amplitudes of the scattering parameters (S-parameters). The dielectric constant of the lung is then post-processed and expressed as a weighted sum of the S-parameters measured from each port. An important aspect of the sensor is the use of multiple electrodes which mitigates the effect of the outer layers (skin, fat and muscle) on the lung's permittivity. This allows for the characterization of deeper tissue layers. To validate the sensor, tissue-emulating gels were employed to mimic in-vivo tissues. Measurements of the lung's permittivity in both healthy and pulmonary edema states are carried out to validate the sensor's efficacy. Using the proposed post processing technique, the calculated permittivity of the lung from the measured S-parameters demonstrated error less than 11% compared to the direct measured value. Concurrently, a medical sensing Body-Area Network (MS-BAN) is also employed to provide for remote data transfer. Measured results via the MS-BAN are well matched to those obtained by direct measurement. Thus, the MS-BAN enables the proposed sensor with continuous and robust remote sensing capability.