关键词： 线粒体,数学形态学,噪声滤除,边缘检测  

摘要： 分析线粒体电镜图像的特点,对其进行预处理,用线性结构元素进行运算,初步获取图像边缘,接着得到二值图像,再用方形结构元素进行运算,减少图像中的无用信息,通过开运算和闭运算滤波去噪并填充边缘缺口,最后对图像进行骨骼化处理,得到清晰约简的线粒体边缘。实验结果表明,该算法能较好的实现线粒体电镜图像的边缘检测,为后续的目标识别提供了良好的基础。

关键词： Algorithmic randomness   Reverse mathematics   Dominated convergence  

摘要： We analyze the pointwise convergence of a sequence of computable elements of L-1(2(omega)) in terms of algorithmic randomness. We consider two ways of expressing the dominated convergence theorem and show that, over the base theory RCA(0), each is equivalent to the assertion that every G(delta) subset of Cantor space with positive measure has an element. This last statement is, in turn, equivalent to weak weak Konig's lemma relativized to the Turing jump of any set. It is also equivalent to the conjunction of the statement asserting the existence of a 2-random relative to any given set and the principle of Sigma(2) collection. (C) 2012 Elsevier B.V. All rights reserved.

关键词： Production scheduling   Mixed integer programming   Project scheduling   Metaheuristic algorithms  

摘要： This paper describes a real problem in a market-driven medium sized foundry delivering a wide range of castings to different markets. The problem consists of finding an efficient production plan to schedule the different processes (moulding, furnacing, cutting, tooling, etc.) needed to the manufacture of the pieces. Different objectives and resources and technical constraints must be taken into account. To solve this problem we have first developed a more classical integer linear programming approach based on a rolling horizon strategy. The most innovative contribution of the paper is that it models the problem as a project scheduling problem. Based on this model we present a metaheuristic algorithm that adapts techniques from the area. Computational experiments comparing both approaches are provided on instances created by a generator simulating real instances.

关键词： Geometric Algebra   Motor   Kinematic Equation   Strapdown Inertial Navigation System Algorithm  

摘要： This paper develops the strapdown inertial navigation system (SDINS) algorithm by using geometric algebra (GA). The kinematic equation of the motor is derived and applied to design the GA-based navigation kinematic equations. These equations combine the attitude and velocity/position integrations which are treated respectively in the traditional SDINS algorithm, and they can be solved by normal differential equation methods. The consistency of the presented algorithm with the traditional algorithm is justified. Simulations are carried out under both ideal and nonideal inertial sensor configurations. The results show that this proposed algorithm can improve the navigation precision remarkably, and restrain the errors caused by the maneuver of the vehicle apparently. Therefore, it is more suitable for navigation systems with high-precision and high-maneuver requirements.

关键词： Biological physics Medical physics  

摘要： Women with mostly mammographically dense fibroglandular tissue (breast density, BD) have a four-to six-fold increased risk for breast cancer compared to women with little BD. BD is most frequently estimated from two-dimensional (2D) views of mammograms by a histogram segmentation approach (HSM) and more recently by a mathematical algorithm consisting of mammographic imaging parameters (MATH). Two non-invasive clinical magnetic resonance imaging (MRI) protocols: 3D gradient-echo (3DGRE) and short tau inversion recovery (STIR) were modified for 3D volumetric reconstruction of the breast for measuring fatty and fibroglandular tissue volumes by a Gaussian-distribution curve-fitting algorithm. Replicate breast exams (N = 2 to 7 replicates in six women) by 3DGRE and STIR were highly reproducible for all tissue-volume estimates (coefficients of variation < 5%). Reliability studies compared measurements from four methods, 3DGRE, STIR, HSM, and MATH (N = 95 women) by linear regression and intra-class correlation (ICC) analyses. Rsqr, regression slopes, and ICC, respectively, were (1) 0.76-0.86, 0.8-1.1, and 0.87-0.92 for %-gland tissue, (2) 0.72-0.82, 0.64-0.96, and 0.77-0.91, for glandular volume, (3) 0.87-0.98, 0.94-1.07, and 0.89-0.99, for fat volume, and (4) 0.89-0.98, 0.94-1.00, and 0.89-0.98, for total breast volume. For all values estimated, the correlation was stronger for comparisons between the two MRI than between each MRI versus mammography, and between each MRI versus MATH data than between each MRI versus HSM data. All ICC values were >0.75 indicating that all four methods were reliable for measuring BD and that the mathematical algorithm and the two complimentary non-invasive MRI protocols could objectively and reliably estimate different types of breast tissues.

关键词： 车辆路径问题   数学模型   蚁群算法   物流配送  

摘要： 通过分析交通路径的特点,给出求解车辆路径问题(VRP)的改进的蚁群算法.该算法通过引入启发因子和参数自适应调整,加速了收敛效率,改善了全局搜索能力,最终数值例子表明本文所提算法是可行的、高效的.对VRP问题有较好的求解效果。

关键词： 液位控制   数学模型   PID   单容自衡水箱  

摘要： 分析了自衡水箱系统的微分方程动态模型,用一阶传递函数模型的辨识方法可以得出水箱的数学模型,并给出了PID算法。通过实验平台对模型与算法进行了验证,并对实验数据与理论数据进行了比较,证明模型与算法的设计都是可行的,从而为利用PLC实现PID控制提供了理论基础。

关键词： Power profile   Energy efficiency   Dense linear algebra   Tile algorithms   Multicore architectures  

摘要： This paper presents the power profile of two high performance dense linear algebra libraries i.e., LAPACK and PLASMA. The former is based on block algorithms that use the fork-join paradigm to achieve parallel performance. The latter uses fine-grained task parallelism that recasts the computation to operate on submatrices called tiles. In this way tile algorithms are formed. We show results from the power profiling of the most common routines, which permits us to clearly identify the different phases of the computations. This allows us to isolate the bottlenecks in terms of energy efficiency. Our results show that PLASMA surpasses LAPACK not only in terms of performance but also in terms of energy efficiency.

关键词： 高考知识点   Apriori算法   关联分析  

摘要： 通过SQL Server2000对陕西省2007-2011年理科数学高考题涉及的知识点进行整理,并利用Matlab软件实现Apriori算法,得出知识点间的频繁项集。结果表明:函数概念与基本初等函数I(指数函数,对数函数,幂函数)、不等式、推理与证明等属于频繁项。