可视动目标逐步求精分割技术研究

运动目标识别跟踪系统中 ,目标分割是至关重要的处理环节。由于目标阴影、碎块等因素 ,估计精度受到影响 ,甚至导致跟踪的失败。提出了目标形状波动度的概念 ,并将其作为目标识别特征 ,利用最大似然估计准则 ,对目标初始区进行逐步求精估计。该算法简练实用 ,能有效地提高估计精度 ,为确保目标可靠性跟踪提供了新的手段。     

XB-SIM*: A Simulation Framework for Modeling and Exploration of ReRAM-Based CNN Acceleration Design

Resistive Random Access Memory(ReRAM)-based neural network accelerators have potential to surpass their digital counterparts in computational efficiency and performance. However, design of these accelerators faces a number of challenges including imperfections of the Re RAM device and a large amount of calculations required to accurately simulate the former. We present XB-SIM, a simulation framework for Re RAM-crossbar-based Convolutional Neural Network(CNN) accelerators. XB-SIM can be flexibly configured to simulate the accelerator's structure and clock-driven behaviors at the architecture level. This framework also includes an Re RAM-aware Neural Network(NN) training algorithm and a CNN-oriented mapper to train an NN and map it onto the simulated design efficiently. Behavior of the simulator has been verified by the corresponding circuit simulation of a real chip. Furthermore, a batch processing mode of the massive calculations that are required to mimic the behavior of Re RAM-crossbar circuits is proposed to fully apply the computational concurrency of the mapping strategy. On CPU/GPGPU, this batch processing mode can improve the simulation speed by up to 5.02 or 34.29. Within this framework, comprehensive architectural exploration and end-to-end evaluation have been achieved, which provide some insights for systemic optimization.     

用政治手段解决国际冲突的有益探索——以朝核问题六方会谈为例

中国在政治解决朝核问题的过程中扮演着作为第三方的大国斡旋者角色,从理论上讲,发挥这一角色作用有其特殊的涵义、困难性和复杂性,并因之要求中国的外交斡旋活动完成一定的调解任务。“六方会谈”是政治解决朝核问题的正确选择和有效途径,中国在促成六方会谈的成功举行并获得初步成果的过程中展示了高超的外交斡旋艺术,包括给予帮助的技术、支持冲突方互动的技术和操控技术,部分地完成了对于朝美之间冲突的调解任务。在中国积极和有效的外交斡旋努力下,朝核问题的解决沿正确的方向前行。     

应用光纤光栅传感器监测弹性材料内部应变

通过添加调试剂,使光纤光栅与弹性材料牢固地接触,利用此种方法将两个连接的光纤光栅传感器正交埋置在弹性材料模块中.对模块施加外力,引起光栅的布拉格反射光的波长发生变化.通过对波长漂移的观测,实现该材料内部应变的检测,并测量出材料的泊松比.实验结果与理论预期基本一致,表明此埋置方法可实现FBG传感器对弹性材料的内应变进行有效地监测.     

辐射与组培复合育成“霞光”等14个菊花新品种

辐射诱变与组织培养相结合，育成了“霞光”等１４个菊花新优品种；对品种来源及形态特征进行了简要描述，并对有关育种技术问题进行了讨论。     

全堆芯格林函数方法的格林函数库的建立

提出了利用微扰正向扩散计算方法的思想,建立了全堆芯格林函数方法（ＣＧＦＭ）中的格林函数库。利用格林函数库取消了内迭代,从而大大提高了中子扩散方程的求解速度。针对我国秦山核电厂的外－内和低泄漏两种布料方案进行了校核计算。结果表明,计算精度与格林函数节块方法（ＮＧＦＭ）相当,计算速度提高近９倍。     

金属中电子结构的密度泛函方法与正电子湮没技术

以密度泛函理论为基础,利用简化的胶体模型,在局域密度近似下研究金属中的空位型缺陷的电子结构和以正电子寿命为表征的缺陷谱.结果表明,随着空位尺度的增加,正电子寿命亦增加并直到饱和值.     

A new method for uniform local heating deep in body using ultrasound phased-array system

A new method for targeted heating of deep tissue was developed by using an ultrasound phased-array system which can generate various multiple foci patterns by electronically changing its amplitude or phase pattern. This method involves using a technique of combining switching and rotating of multiple foci patterns to create a uniform temperature over tissue volumes in various size. Using this method, the target tissue deep in the body can be heated to a specified temperature, which gives conditions for thermo-sensitive liposomes release. A simulation study for a 108-element, spherically sectioned array was performed to determine an optimal heating scheme from a set of multiple focus fields which were produced by inputting different combinations of phases and amplitudes. Comparisons of a static multiple foci field, the switched fields and the switched-rotated fields indicated that the technique of combining switching and rotating of multiple foci patterns has advantages of both lowering the peak temperature and evening the temperature distribution. The simulation results also show that the therapeutic heating zones in various size employing the combined method. These results offer significant data for designing thermotherapy equipment for tumor-specific drug release with thermo-sensitive liposomes.     

基于留数分析的模式发现算法的改进及其应用

文中提出了一种改进的知识发现算法. 针对基于留数分析和递归切割的模式发现算法的不足,在样本空间分割时,考虑到不同属性对知识发现的不同贡献,采取不同的离散化标准;在模式判别准则方面,改良后的算法随切割后产生的子空间数量动态调整模式判别准则. 在人造数据集和电力系统安全稳定评估中的应用结果验证了算法改进思路的合理性与有效性. 与原算法相比,改良后算法的知识发现效率更高、应用范围更广.