一种新的本征函数及其应用(英文)

提出了一类新的本征函数。由这类新的本征函数所构成的外边值问题的解是一种快收敛级数的形式。这种形式与对同样边值问题的常规本征函数级数解进行Watson变换后的形式相似。文中给出了用这种本征函数求解地球表面上点源标量位的例子。     

劳动价值观与知识价值观辩正

马克思劳动价值论所指的劳动是由体力劳动和脑力劳动两个不可分割的部分组成,而现代西方学者把劳动价值和知识价值割裂开来,并用知识价值取代劳动价值。事实上,强调知识价值在今天的主导作用无可厚非,但是,知识只有通过劳动才能转化为商品,把潜在价值转化为现实价值。劳动价值和知识价值不是相互排斥的,而是相互补充的。我们既应坚持劳动价值论,又应强调知识在其中的重要作用。     

使哲学更加贴近实践——读陶富源教授主编的《马克思主义哲学原理》(第三版)

当今中国正在发生一场哲学变革,其目的在于克服旧教科书体系的系列缺陷,恢复马克思主义哲学的精神实质,探索和形成中国马克思主义哲学的新形态,使马克思主义哲学更加贴近实践,贴近生活,贴近时代.使哲学更加贴近实践,有两层涵义.一是,要以科学实践观为透视点,对人与世界,主体与客体,主观与客观关系进行理论反思并形成唯物主义哲学体系.二是,就当前中国来说最重要的实践就是中国人民正在进行的建设中国特色社会主义的伟大实践.陶富源教授主编的<马克思主义哲学原理>正是这样一部集中反映上述哲学变革成果的代表性著作.     

Radon Testing Behavior in a Sample of Individuals with High Home Radon Screening Measurements

Although radon exposure has been identified as the second leading cause of lung cancer, fewer than 6% of U.S. homeowners test their homes for radon. This report examines participants'follow-up radon testing behavior subsequent to receiving an initial screening radon level greater than 20 pCi/L. Sixty-two participants in the Iowa State-Wide Rural Radon Screening Survey who had radon screening measurements over 20 pCi/L were questioned by phone survey 3 months after receipt of their radon screening result to assess: whether participants were aware of radon's health risk; if participants recalled the radon screening results; how participants perceived the relative health risk of radon and whether participants planned follow-up radon testing. Only 19% of the respondents specifically identified lung cancer as the possible adverse health outcome of high radon exposure, and the majority of participants underestimated the health risks high radon levels pose when compared to cigarettes and x-rays. In addition, less than one third (29%)of the participants actually remembered their radon screening level within 10 pCi/L 3 months after receiving their screening results. Only 53% of the individuals correctly interpreted their screening radon level as being in the high range, and only 39% of the participants planned follow-up radon measurements. Receipt of radon screening test results indicating high radon levels was not an adequate motivational factor in itself to stimulate further radon assessment or mitigation. Our findings suggest that free radon screening will not result in a dramatic increase in subsequent homeowner initiated remediation or further recommended radon testing.     

A model of the age patterns of births by parity in natural fertility populations

This research develops a convolution model to express the age patterns of fertility at each birth order in natural fertility populations in terms of six parameters, directly representing the proximate determinants of fertility, and a series of parity level indicators. The parity level indicators at each birth order are simply the proportions of women in a cohort who will eventually have births at each birth order it the age‐related fecundity decline is controlled. The Coale‐McNeil nuptiality model is adopted to represent the age pattern of first marriage rates and the natural fertility schedule employed in the Coale‐Trussell fertility model is incorporated to adjust age effects. The fast Fourier transform is used in solving the model numerically. It proves that the model is able to provide excellent fits to fertility for rural Chinese women in the 1950s.     

On the use of functional calculus for phase-type and related distributions

The area of phase-type distributions is renowned for its ability to obtain closed form formulas or algorithmically exact solutions to many complex stochastic models. The method of functional calculus will provide an additional tool along these lines for establishing results in terms of functions of matrices. Functional calculus, which is a branch of operator theory frequently associated with complex analysis, can be applied to phase-type and matrix-exponential distributions in a rather straightforward way. In this article we provide a number of examples of how to execute the formal arguments.     

A method for computing the autocovariance of renewal processes

In this paper we derive formulae for the autocovariance functions of renewal and renewal reward processes. The derivation is based on a Poissonization technique of a renewal process. The formulae are expressed in the form of Laplace transforms. In some cases we may invert the Laplace transforms analytically, but in general we have to invert them numerically.     

Partial Ordering and Aging Properties of Order Statistics When the Sample Size is Random: A Brief Review

In many practical situations, order statistics arise naturally with random sample size. In this article, we review results on partial orderings and aging properties of such order statistics. The comparison of order statistics for different sample sizes is also discussed here.     

针对影像处理的快速二维离散余弦转换算法(英文)

由于离散余弦转换在影像处理领域之重要性与日俱增,且消耗许多处理器运算时间,所以众多快速二维离散余弦转换算法不断被发表。该文提出一个应用于JPEG及MPEG图像处理的快速二维8×8离散余弦转换算法,该算法主要运用基本的累加及移位运算,快速评估8×8影像区块的复杂程度,可调整离散余弦转换参数的计算数量。该算法只需花费少量硬件成本,如比较器、加法器、移位器,便可有效降低离散余弦转换运算时间,且在模拟结果显示所提出的算法与传统及整数离散余弦转换相比,可达到较快的运算速度,且在量化系数较大的情况下,可得到更好效果。     

付氏变换法反褶积的新算法

应用离散付氏变换的反褶积方法，当X(k)存在零点时，求解H(k)困难。采用广义离散付氏变换可以解决这个问题。本文提出的算法既能解决X(k)有零点的问题，又可保留DFT算法的反褶积快速计算特性。