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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。本次沙龙由我校博士后江明、陆金波和刘星分享其研究成果，诚挚邀请感兴趣的师生参加。
一、时 间：2017年4月27日（周四）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：通信抗干扰技术国家级重点实验室 电子科技大学博士后联谊会
五、活动安排：
报告一：
（1）主题：Domain decomposition method based on integral equation for multi-scale problem
（2）主讲人：江明 电子工程学院博士后
（3）交流内容：
Modern electronic device system often involves the use of metamaterials, complicated geometry structures, and mounting on large composite platforms. However, such complex systems do impose significant challenges for numerical simulations. Not only do they usually in need of large-scale electromagnetic field computations, but also they tend to have many very small features in the presence of electrically large structures. Such multi-scale electromagnetic problems tax heavily on numerical methods (finite element, finite difference, integral equation methods etc.) in terms of desired accuracy and stability of mathematical formulations. This research presents approaches to analysis the multi-scale electromagnetic problems in the real-life applications using integral equation methods based on the domain decomposition method (IE-DDM), which is a kind of non-overlapping and non-conformal domain decomposition method. Compared with conventional integral methods, it is based on a divide-and-conquer philosophy. Instead of tackling a large and complex problem directly as a whole, the original problem is partitioned into smaller and easier to solve sub-domains. Some suitable boundary conditions called transmission conditions are prescribed at the interfaces between adjacent sub-domains to enforce the continuity of electromagnetic fields. On the one hand, suitable CEM solvers can be choose in various regions in the frame work of the DDM, which is endowed with the natural attributes of the parallelization. On the other hand, it extremely reduces the burden of preparation of geometry because DDM allows the mesh can be non-conformal. This is very important for the electromagnetic simulation of complex large problems. From the perspective of practical engineering application, the research work provides a flexible, numerical error controllable numerical tool for any perfect electric conductors, mulit-layer homogeneous dielectric cases, conductor-dielectric composers and thin dielectric coated targets.
主讲人简介：
Ming Jiang is a post-doc majored in computational electromagnetic. He obtaned bachelor’s degree in electronic information engineering in Anhui University, then performed PhD research in computational electromagnetic advised by Prof. Jun Hu in UESTC. He has been in ElectroScience Lab as a joint Ph.D starting from Feb. 2015 to Feb. 2016 at the Ohio State University. His research interests include electromagnetic simulation technologies and computer-aided engineering, analyses of numerical methods, and domain decomposition methods.
报告二：
（1）主题：Parametric Controller Design of Hopf Bifurcation System
（2）主讲人：陆金波 能源科学与工程学院博士后
（3）交流内容：
In the research, a general parametric controller design method is proposed for Hopf bifurcation of nonlinear dynamic system. This method does not increase the dimension of the system. Compared with the existing methods, the controller designed by this method has a lower controller order, a simpler structure, and it does not contain equilibrium points. The method keeps equilibrium of the origin system unchanged. Symbolic computation is used to deduce the constraints of controller, and cylindrical algebraic decomposition is used to find the stability parameter regions in parameter space of controller. The method is then employed for Hopf bifurcation control. Taking Lorenz system as an example, the controller design steps of the method and numerical simulations are discussed. Computer simulation results are presented to confirm the analytical predictions.
（4）主讲人简介：
Jinbo Lu obtained Master’s degree, and entered the automotive electronics engineering center of Harbin Institute of Technology in 2004. Then he worked in the Sichuan Institute of Aerospace Technology as an engineer, in 2008. Dr. Lu received the Ph.D. degree from detection technology and automatic engineering of UESTC in 2016. He currently works as a post-doc in the School of Energy Science and Engineering of UESTC, advised by Prof. Xiaorong Hou. He mainly engaged in the controller design of industrial system and nonlinear systems control.
报告三：
（1）主题：New Class of Hopping Sequences for the Secure Access Mechanism and Secure Transmission Mechanism of the Data Link
（2）主讲人：刘星 通信抗干扰技术国家级重点实验室博士后
（3）交流内容：
In order to meet the need of future information warfare, the data link will develop toward high-speed, large capacity, security and anti-jamming. The secure access and secure transmission for the data link are an important part of data link security. We then study the secure access mechanism and information transmission mechanism for the data link, utilize the new classes of sequences for the secure access mechanism and information transmission mechanism for the data link and construct new control sequences for data link access mechanism. First, we establish the relation between the access control for data link and frequency hopping sequences, then constructing corresponding control sequences. We establish a one-to-one correspondence between each time slot and frequency hopping sequence in each time frame, and the relation of time slots of each user can be characterized by the Hamming correlation of frequency hopping sequence. The length of frequency hopping sequence is greater than the number of time frames as much as possible. Such frequency hopping sequence is referred to as "control sequence". According to the structural characteristics of the data link mechanism, no-hit-zone frequency hopping sequence can be used. Thus, the main purpose is to design no-hit-zone frequency hopping sequences with good properties. By utilizing these no-hit-zone frequency hopping sequences, we realize the control for the secure access and secure transmission of the data link.
（4）主讲人简介：
Xing Liu received the Bachelor degree in Communication Engineering and Ph.D. degree in Communication and Information System from Southwest Jiaotong University, in 2009 and 2014, respectively. From 2015 to 2016, he worked as an engineer in the 38th Research Institute of China Electronics Technology Group Corporation (CETC’38). Currently, he works as a Postdoctoral Fellow in the National Key Laboratory of Science and Technology on Communications of UESTC, advised by Prof. Liang Zhou. His main research interests include sequence design and coding theory.
电子科技大学博士后管理办公室
2017年4月20日
编辑：林坤 / 审核：林坤 / 发布：林坤
