学　术

　　为搭建我校博士后之间的学术交流平台，促进学术水平提升，学校博士后管理办公室组织开展博士后学术沙龙活动。本次沙龙邀请我校博士后李玥玥、齐聪慧和Abubaker Wahaballa分享其研究成果，欢迎感兴趣的师生参加。

　　一、时　间：2016年6月20日（周一）14：30

　　二、地　点：清水河校区经管楼宾诺咖啡

　　三、主办单位：电子科技大学博士后管理办公室

　　四、承办单位：通信与信息工程学院　电子科技大学博士后联谊会

　　五、活动安排：

　　报告一：

　　（1）主题：Communication Issues in VANET Real-Time Information Generation and Control Systems

　　（2）主讲人： 李玥玥  通信与信息工程学院博士后 

　　（3）交流内容：

　　To achieve effective and efficient message delivery for road safety and infotainment applications, the challenges Intelligent Transportation Systems (ITS) address have only increased in time as, along with fast and cost-effective route planning, environmental sensibilities are nowadays also prominent. Currently, many ITS related studies focus on studying Car-to-Car (C2C) and Car-to-Infrastructure (C2I) communications in Vehicular Ad-hoc Network (VANET) environments. The utilization of such infrastructure-less and flexible topology networks poses several challenges for the routing mechanism, specifically through broadcasts. On the basis of traditional VANET communications, an advanced cognitive radio (CR) VANET architecture with multi-channel and multi-hop communications is further considered. Cognitive routing coupled with spectrum sensing and spectrum sharing technologies is potentially investigated.

　　（4）主讲人简介：

　　Yueyue Li received the MSc (with distinction) and Ph.D degrees from Nottingham Trent University, UK, in 2008 and 2013, respectively. She currently works as a Postdoctoral Fellow in the School of Communication and Information Engineering, UESTC. Her research interests include MANET/VANET communications and networking, protocol design, modeling and analysis of spectrum resource management in cognitive radio MANETs/VANETs.

　　报告二：

　　（1）主题：Electromagnetic scattering model for simulate SAR image

　　（2）主讲人：齐聪慧  电子工程学院博士后

　　（3）交流内容：

　　The research on synthetic aperture radar (SAR) imaging simulation from the virtual environment has important scientific significance in microwave remote sensing, target detection and separation technology of signal. In order to form the SAR image for the 3-D scene, the electromagnetic scattering form different kinds of rough surfaces are studied, i.e. the rough sea surface, grass, rough soil surface. Surface scattering is caused by dielectric discontinuities at all points on a surface boundary; while volume scattering is caused by dielectric discontinuities distributed throughout a volume. In the simulation of SAR image, it usually needs massive electromagnetic computation for the backscattering from rough surface. Accordingly, the electromagnetic model should be easy to evaluate and have a wide range of applicability in frequency, angular range, polarization and roughness scales. In my research, small perturbation model (SPM) by giving explicit expressions is used for small-scale roughness, and then integral equation model (IEM) which is more complex than SPM is used for rougher surface. A model for scattering from a low-dielectric layer of Rayleigh scatterers bounded by randomly rough surface is used to calculate the scattering from leafy vegetation or some snow fields.

　　（4）主讲人简介：

　　Conghui Qi is a post-doc majored in signal processing. She obtained bachelor’s degree in microwave engineering in UESTC, then performed PhD research in computational electromagnetic advised by Prof. Zhiqin Zhao in UESTC. Her research interests include electromagnetic scattering from rough surface, clutter analysis and target detection in complex environment.

　　报告三：

　　（1）主题：Security Issues in Bitcoin and Crypto-Currency Systems

　　（2）主讲人： Abubaker Wahaballa　信息与软件工程学院博士后

　　（3）交流内容：

　　Throughout history, money has evolved several times from golden and silver coins to paper money called banknotes, then credit cards and now Bitcoin. Bitcoin is a digital currency (also called cryptocurrency) that uses cryptographic techniques to regulate the creation of coins and verify the transfer of funds. It is based on decentralized trust to operate without central authority or financial institution. Bitcoin is pretty much like cash, where it can be stolen or lost. This presentation examines the constraints and security challenges of Bitcoin ecosystem. Accordingly, better security tools and practices of Bitcoin ecosystem are identified and discussed. This allows consumers to enjoy a secure and trouble-free bitcoin experience.

　　（4）主讲人简介：

　　Abubaker Wahaballa currently working as a Postdoctoral Fellow at Sichuan Provincial Key Laboratory of the Network and Data Security, School of Information and Software Engineering, University of Electronic Science and Technology of China UESTC. He received the PhD degree from UESTC in 2015. His current research interests include public key cryptography, BitCoin, NFC payment security, e-auction.

　　　　　　　　　　　　　　　　　　　电子科技大学博士后管理办公室

　　　　　　　　　　　　　　　　　　　　　　2016年6月17日