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讲座名称1：Revisiting Basics of Body-Centric Wireless Communications for R&D of Wearable Devices

讲座人：Prof. Koichi ITO

讲座时间：6月3日8:00-12:00

讲座地点：雁塔校区皇冠hg666体育议中心104报告厅

讲座人介绍：

伊藤浩一（Koichi Ito）在日本东京工业大学获得博士学位。他目前是日本千叶大学前沿医学工程中心（CFME）的名誉教授和客座教授。他曾担任千叶大学副校长兼研究部主任以及 CFME 主任。他的主要研究兴趣包括用于医疗应用的天线、移动通信的小型天线、利用人体模型评估电磁场与人体相互作用的研究以及人体为中心的无线通信天线系统。伊藤博士是美国电气和电子工程师协皇冠hg666体育（IEEE）的终身皇冠hg666体育士、国际无线电科学联盟（URSI）的皇冠hg666体育士以及日本电子信息技术学皇冠hg666体育（IEICE）的皇冠hg666体育士。他荣获了 2020 年 URSI 颁发的巴尔塔萨尔·范德波尔金质奖章。他曾担任《IEEE 天线与传播学报》的副主编、IEEE 天线与传播学皇冠hg666体育（AP-S）的执行委员皇冠hg666体育成员和杰出讲师、生物电磁学学皇冠hg666体育的董事皇冠hg666体育成员、ISAP2012 的大皇冠hg666体育主席、欧洲天线与传播协皇冠hg666体育的选举代表、日本热疗学皇冠hg666体育的副皇冠hg666体育长、URSI 委员皇冠hg666体育 K 的主席以及 2019 年 IEEE AP-S 的主席。他目前担任 IEEE 天线与传播学皇冠hg666体育技术方向委员皇冠hg666体育的首任主席。

讲座内容：

In recent years, compelling electromagnetic technologies such as human body communication (HBC) and integrated sensing and communication (ISAC) have been widely studied and used in many different applications including healthcare, nursing, sports, assistive tools for workers, and so on. HBC utilizes the human body as a transmission medium to transmit or receive wireless signals, and it serves as one of promising physical layer solutions for body area networks (BANs).

HBC and ISAC can be implemented in a wide range of smart and small wearable devices, such as healthcare bands, smart watches, smart glasses, etc. These devices contain transmitters, receivers and various sensors. Equivalent circuit models including many resistors and capacitors have been usually employed for practical design of such wearable devices. However, the design is sometimes sensitive to changes of device locations, human-body size and shape, surrounding environments, etc.

In our laboratory, we have studied body-centric wireless communications including HBC numerically and experimentally over the wide frequency range. With basic models and techniques, we can design and optimize wearable devices and predict characteristics of the communication channels. Furthermore, we can estimate and control specific absorption rate (SAR) distributions inside the human body.

For R&D of wearable devices, it is essential to evaluate interactions between a human body and electromagnetic waves radiated from built-in antennas. It seems difficult to use a real human body for experimental evaluation of antenna performances. Instead, computer simulation is usually performed with digital human-body models. However, experiments with physical human-body phantoms are indispensable to validate the results of numerical simulations or to minimize animal experiments.

讲座名称2：Is DC Power Transmitted by Electromagnetic Waves?

讲座人：Prof. Ming yu Lu

讲座时间：6月10日8:00-12:00

讲座地点：雁塔校区皇冠hg666体育议中心203报告厅

讲座人介绍：

陆明宇1995年、1997年先后于中国清华大学获得电气工程学士、硕士学位，2002年于美国伊利诺伊大学厄巴纳-香槟分校获得电气工程博士学位。2002年至2005年，他在该校电磁实验室从事博士后研究；2005年至2012年任德克萨斯大学阿灵顿分校电气工程系助理教授；2012年加入西弗吉尼亚大学理工ku酷游app入口,亚博app,皇冠hg666体育电气与计算机工程系，现任教授。

他的研究方向涵盖无线输电、物联网、雷达系统、天线设计与计算电磁学。2001年曾获IEEE国际天线与传播研讨皇冠hg666体育（波士顿）学生论文竞赛一等奖；2006至2011年担任IEEE沃斯堡分皇冠hg666体育天线与传播章节主席；现为IEEE杰出微波讲师。

讲座内容：

It is well known that two pieces of electrical conductor behave as a waveguide when they are employed to transmit AC signals. For instance, the inner conductor and outer conductor of a co-axial cable jointly guide dynamic electromagnetic wave propagation inside the co-axial cable. When two pieces of electrical conductor are employed to transmit a DC signal, the two pieces of conductor do not behave as a waveguide in theory. A DC voltage produces a static electric field, and a DC current produces a static magnetic field. According to Maxwell’s equations, a static electric field and a static magnetic field are de-coupled from each other, and consequently, they do not jointly support electromagnetic wave propagation. In theory, a DC signal starts at “time = ??” and ends at “time = +?.” Nevertheless, in practice, a DC signal must be turned on at a certain “turn-on moment” and turned off at a certain “turn-off moment.” Generally, a DC signal cannot be established instantaneously at the turn-on moment; rather, a transient state with a certain time span is necessary for the DC signal to be established. Similarly, a “turn-off transient state” is usually necessary for the DC signal to vanish gradually. Since the “turn-on transient state” and “turn-off transient state” both rely on electromagnetic wave propagation, the DC signal in between these two transient states ought to be sustained by electromagnetic wave propagation as well. This talk presents some experimental and theoretical studies on the electromagnetic wave propagation in DC circuits. In the experimental studies, a 5-MHz sinusoidal signal, a 500-Hz sinusoidal signal, and a DC signal are compared among each other when they are turned on, after they are established over a piece of long co-axial cable, and when they are turned off. The experimental results do not demonstrate any fundamental differences among the 5-MHz signal, 500-Hz signal, and DC signal in terms of propagation over the co-axial cable. Based on the experimental results, the well-known formulations of AC wave propagation are extended to DC wave propagation. The experimental and theoretical studies jointly indicate that DC electrical power is transported by electromagnetic wave propagation in practice.

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