IC芯片视觉检测中快速图像匹配定位

利用IC芯片定位图像特征,提出一种用其投影特征的基于优势遗传自适应遗传算法(AGA)的快速匹配算法(P-AGA)。设计基于图像灰度投影特征的匹配规则,使算法适应于一定的噪声、缩放、旋转和变形图形,而且运算量小。对图像采用2×2重采样,使运算量降低3/4。匹配过程是在二维图像空间的随机寻优,提出优势遗传的AGA,用匹配距离作为适应度函数,并自适应改变交叉变异概率进行匹配寻优,快速准确求出全局最优匹配点。实验表明,该算法比标准遗传算法(SGA)快约1.9倍,准确度提高约22.5%,有效提高匹配速度和准确度,有很强的抗噪声能力,鲁棒性好。     

图形化模型在亲子鉴定中的应用

利用图形化模型理论,以及DNA数据,研究了一个在法庭上颇有争议的亲子鉴定问题.通过案例中的家谱图,建立Bayesian网络,根据遗传学的孟德尔定律,借助于Hug in软件,计算出网络中各结点的概率.在数学上,给出了一个可供法庭参考的合理推断.     

Dependence of energies on the bond lengths in molecules and crystals

The dependence of the binding energies in molecules and crystals on the interatomic distances near the equilibrium position was established in the framework of the Mie equation using the force constants of molecules and the elasticity moduli of solids. To evaluate the repulsion forces, we used the Morse function for molecules and the Born-Landé approach for ionic crystals.     

基于抑制消减杂交识别白化刺参和青刺参差异表达基因

为探寻刺参体色遗传的内在分子基础,运用Clontech SSH试剂盒分别构建了白化刺参和青刺参的正反向抑制性消减杂交文库;221个克隆测序分析确认了体色遗传差异性表达基因26个;GO分析显示这些差异基因分别隶属于核糖体基因、能量代谢、细胞结构、免疫调控、白化性状直接相关基因及未知基因.荧光定量PCR结果显示:ADP-核糖激化因子在白化刺参中相对表达量约是青刺参的2倍,而虾青素和小眼畸形转录因子在白化刺参中相对表达量则低于青刺参,分别为青刺参的0.38倍和0.47倍,相对表达量趋势和文库所得结果一致.该研究为进一步了解刺参体色分化及其优良性状的形成机制提供了基础资料.     

基于优势遗传的模糊函数主脊切面智能搜索方法

提取和补充新的信号参数是解决复杂体制雷达辐射源信号分选难题的有效手段,模糊函数主脊切面特征是众多新特征参数中较为可行的特征之一。为更快速地搜索信号的模糊函数主脊切面,本文构建了一种优势遗传搜索的智能算法,并采用统计假设检验理论对数据进行分析和检验。实验结果表明,所提方法可使模糊函数主脊切面的平均搜索耗时降低为原方法的28.6%,且能以较高的概率成功搜索到精度更高的切面特征,证实了所提方法的有效性和可行性。     

Kernel Thread Scheduling in Real‐Time Linux for Wearable Computers

In Linux, real‐time tasks are supported by separating real‐time task priorities from non‐real‐time task priorities. However, this separation of priority ranges may not be effective when real‐time tasks make the system calls that are taken care of by the kernel threads. Thus, Linux is considered a soft real‐time system. Moreover, kernel threads are configured to have static priorities for throughputs. The static assignment of priorities to kernel threads causes trouble for real‐time tasks when real‐time tasks require kernel threads to be invoked to handle the system calls because kernel threads do not discriminate between real‐time and non‐real‐time tasks. We present a dynamic kernel thread scheduling mechanism with weighted average priority inheritance protocol (PIP), a variation of the PIP. The scheduling algorithm assigns proper priorities to kernel threads at runtime by monitoring the activities of user‐level real‐time tasks. Experimental results show that the algorithms can greatly improve the unexpected execution latency of real‐time tasks.     

Inner‐shell chemical shift of DNA/RNA bases and inheritance from their parent purine and pyrimidine

Inner‐shell electronic structures, properties and ionization spectra of DNA/RNA bases are studied with respect to their parent pyrimidine and purine species. Density functional theory B3LYP/aug‐cc‐pVTZ has been employed to produce the geometries of the bases, whereas LB94/et‐pVQZ//B3LYP/aug‐cc‐pVTZ is used to calculate site‐related Hirshfeld charges and core (vertical) ionization energies, as well as inner‐shell spectra of C1s, N1s and O1s for DNA/RNA bases and their parent pyrimidine and purine species. The site‐dependent variations of properties indicate the changes and inheritance of chemical environment when pyrimidine and purine become substituted. In general, although the changes are site‐dependent, they are also ring‐dependent. Pyrimidine bases change less significantly with respect to their parent pyrimidine than the purine bases with respect to their parent purine. Pyrimidine bases such as uracil, thymine and cytosine inherit certain properties from their parent pyrimidine, such as the Hirshfeld charge distributions and the order of core ionization energy level etc. No particular sites in the pyrimidine derivatives are engaged with a dramatic chemical shift nor with energy crossings to other sites. For the core shell spectra, the purine bases inherit very little from their parent purine, and guanine exhibits the least similarities to the parent among all the DNA/RNA bases.     

基于双层角色和组织的可扩展访问控制模型

针对现有基于角色的访问控制(RBAC)研究存在角色设置单一使得适应性差、多域环境下角色或权限冗余、对资源管理关注不够等问题,论文提出支持资源管理的基于双层角色和组织的访问控制模型。通过双层角色划分,提出基于职能角色和任务角色的双层角色架构,使得模型更加符合实际,也更具适应性;引入组织的概念并与双层角色相结合,对角色和权限的概念加以扩展,形式化定义了提出的基于双层角色和组织的访问控制模型,描述了影响模型安全的职责分离约束和势约束。对模型的表达能力、复杂度进行了分析,分析表明该机制不仅保留了RBAC的特点与优势,且比RBAC具有较低的复杂度并更适合于由多个相似组织构成的分布式多域环境。     

生物大分子中的孤立子激发与分形特性

 本文研究了生物大分子如DNA在ATP水解作用或其它刺激作用下所产生的局域性涨落和结构畸变（如碱基对的相对运动等）所诱导的孤立子激发的特性，以及这种激发与生物大分子的生物能（如DNA的复制等）之间的关系和它的分形、分维特性。     

面向对象程序设计刍议

面向对象程序设计是一种围绕真实世界的概念来组织模型的程序设计方法，对象是包含现实世界物体特征的抽象实体。在计算机科学中，程序操作的任何成分都可以看作一个对象，一个类所有的对象都有相同的数据结构，并且共享相同的操作代码，所以说类是所有对象共同的行为和不同状态的集合体。本文通过对电视机类的定义阐述了电视机的基本功能及工作原理，来说明类是创建对象的模块，一个类所有的对象都有相同的数据结构的概念。