时间：2022年5月17日（星期二）10:00-11:20  

会议号：腾讯会议  161 877 045

主 办：华中农业大学

承 办：理学院

报告人1：邓钊 10：00-10：40

题目：凸优化问题的改进Peaceman-Rachford分裂方法

Modified Peaceman-Rachford Splitting Method for Convex Programming

摘要：两块可分凸优化问题在科学和工程中有许多重要的应用。Peaceman-Rachford分裂方法（PRSM）是求解这些问题的重要方法。虽然仅在目标函数的凸性假设下无法保证PRSM的收敛性，但PRSM在求解大规模问题时具有较高的计算效率。本次报告，我们提出了一些改进的PRSM分裂方法，不仅提高了算法的计算效率，而且保证了算法的收敛性。利用变分不等式的证明框架，从理论上分析了算法的全局收敛性和最坏情况下的渐近迭代复杂度。通过全变分（TV）去噪、低块秩图像分解和计算机断层扫描（CT）问题的数值实验，验证了所提出算法的有效性，即使与当前最好的方法相比。

There are numerous important applications of two-block separable convex programming problems in science and engineering. The Peaceman-Rachford splitting method (PRSM) is a benchmark to solve these problems. Although the convergence of PRSM is not guaranteed only under the convexity of the objective function, it is favored for its high efficiency in solving large-scale problems. In this talk, we propose some modified PRSM, which not only improve the computing efficiency, but also ensure the convergence properties. The global convergence and the worst-case asymptotic iteration complexity are derived theoretically via the variational inequality framework. Numerical experiments on total variation (TV) based denoising models, low patch-rank image decomposition and computed tomography (CT) are presented to verify the effectiveness of the introduced methods even compared with the state-of-the-art methods.

报告人2：郭闰达 10：40-11：20

题目：有机发光材料与器件及其在微显示中的应用研究

Organic light-emitting materials and devices and their application in micro-display.

摘要：有机电致发光器件（OLED）在实现高分辨、超轻薄和全柔性显示方面具有独特优势，是信息科学和材料科学交叉领域的重点研究方向之一，当前主要瓶颈在于兼顾成本、效率、色品和稳定性的蓝光材料与器件。因此，我们面向全彩色显示应用的需求，开展了新型有机电致发光材料与器件及硅基有机微显示器的相关研究。基础研究方面：第一，提出三重态-三重态湮灭效应与“热激子”的杂化能量转移理论，同时制备出外量子效率超过10%、CIEy值小于0.06的电致发光器件，器件性能处于学界先进水平。第二，为了满足低碳节能的需求，降低蓝光器件功耗，提出外围大位阻基团包封策略，获得了高迁移率蒽基电子传输材料，并系统研究了分子构-效关系。第三，实现高分辨率、广色域是目前显示领域的重要发展方向，我们开展了高效率、窄半峰宽热活化延迟荧光OLED的构建工作。应用研究方面：制备出头盔式硅基有机微显示器样机，集成了微显示芯片与视频驱动芯片，完成了从单元器件开发到显示系统开发的过渡。

Organic light-emitting device (OLED) offer unique characteristics such as high resolution, light weight and flexibility and are therefore a promising candidate for   future display applications. OLED is one of the key research directions of information science and materials science. However, at present, the main bottleneck lies in the cost, efficiency, color and stability of blue light materials and devices. Therefore, we have carried out relevant research on new organic luminescent materials, devices and silicon-based organic micro-displays. Basic research: First, the hybrid energy transfer theory of triplet-triplet annihilation effect and "Hot excitons" was proposed, electroluminescent device with external quantum efficiency over 10% and CIEy < 0.06 were obtained, which was in the advanced level in academia. Second, the large steric peripheral group encapsulation strategy was proposed, and high electron mobility anthracene-based materials and OLEDs were obtained to meet the purpose of reducing power consumption. Meanwhile, the molecular structure-effect relationship was systematically studied.  Third, realizing high resolution and wide color gamut is an important development direction in the display field. We have carried out the construction work of thermally-activated delayed fluorescence OLED with high efficiency and narrow FWHM.  Application research: helmet-type silicon-based organic micro-display prototype was prepared, which integrated micro-display chip and video driver chip, completing the transition from unit device development to display system development.