使用PB中的动态数据交换技术

主要讲述了PowerBuilder中DDE技术的具体应用与一些基本原则 ,介绍了PowerBuilder中的DDE常用函数、事件及它们的使用方法 ,最后通过一个实例来体现PB在支持Windows机制上的出色表现     

使用PB中的动态数据交换技术

主要讲述了PowerBuilder中DDE技术的具体应用与一些基本原则，介绍了PowerBuilder中的DDE常用函数、事件及它们的使用方法，最后通过一个实例来体现PB在支持Windows机制上的出色表现。     

PowerBuilder在企业管理信息系统中用户权限管理的实现

介绍了PowerBuilder在企业管理信息系统中实现用户权限管理的一种方法。     

函数图像的变换

函数图像的变换是研究函数性质的一项重要工具,高考要求能够利用函数的奇偶性及图像的对称性描绘函数的图像,能够利用函数的图像研究函数的性质,通过函数的图像也可以进一步加深对函数性质的理解。总之,函数的性质和图像二者相辅相成,缺一不可。在复习时我们应突出函数图像的几何变换,以便更好的研究函数的性质。     

基于图像片的模糊C均值聚类图像分割

本文提出了一种全新的基于图像片的模糊C均值聚类的图像分割方法.将图像片的思想引入聚类分割中,提出IPFCM方法,用局部的图像片来代替聚类分割中的像素点,从而增大不同类别之间的差异,并对隶属度更新函数进行改造使隶属度函数分布具有单峰值性.实验结果表明,本文方法具有较强的抗噪性和较高的分割精度,图像的隶属度函数与理想隶属度函数十分接近.同时无需过多控制参数,具有较强的可靠性和适应性.另一方面,本文将聚类中心的每一个成员扩展为一个向量,并给出了向量聚类中心的更新公式,为日后将多种图像特征加入FCM对图像进行分割提供了充分的理论基础.     

基于图像混合核的列生成PM2.5预测

传统PM_2.5预测方法获取污染物浓度数据需要大型精密仪器，成本较高。本文尝试利用图像数据进行PM_2.5浓度预测。大气PM_2.5浓度的变化与图像的暗通道强度、对比度和HSI（Hue-saturation-intensity）颜色差异有密切联系。大气中PM_2.5浓度的升高会导致非天空区域的暗通道强度值下降，图像对比度下降和HSI空间颜色差异变小。通过分析PM_2.5浓度与图像特征的关系，提出了一种基于图像混合核的列生成空气质量PM_2.5预测模型。首先，以1 h为采样周期，每日8:00～17:00为采样范围，采集多种天气条件下的景物图像，提取图像的对比度、暗通道强度和HSI颜色差异共5个图像特征。其次，数据存在样本规模大、样本不平坦分布等特点，单个核函数构成的预测模型难以满足预测精度需求，因此本文按照核结构从简单到复杂的原则，选择线性核函数、多项式核函数和高斯核函数三种核函数建立组合模型。然后计算每个核基于训练样本的Gram矩阵，并将所有Gram矩阵并列成一个混合核矩阵。利用列生成算法和混合核矩阵建立预测模型，求解模型参数。最后，进行仿真实验，实验结果表明本文提出的可满足预测精度要求，与单核预测模型相比，该预测模型预测精度更高，模型稳定性更好。计算复杂度分析结果显示基于图像混合核的列生成模型与单核预测模型相比计算量无明显增加。      

在Power Builder中创建通用打印预览窗口

本文介绍了如何在PowerBuilder中创建一个通用的打印预览窗口。     

PowerDesigner扩展属性问题的研究

在管理信息系统开发和维护过程中,数据库建模工具PowerDeigner、开发工具PowerBuilder和大型数据库管理系统Oracle常常配合使用.利用PowerDesigner的扩展属性功能可以提高管理信息系统的开发效率,节省劳动力.本文介绍了PowerDesigner的正向、逆向扩展属性功能,同时对PowerDesigner物理数据模型和PowerBuilder系统表、Oracle数据库的对应关系给予了说明.     

一种改进的图像增强算法及其在铸坯图像增强中的应用

根据低照度图像暗、对比度低的特点,提出了一种基于3次样条插值函数的直方图规定化方法,并用其对连铸板坯表面图像进行对比度增强处理。该算法是在直方图规定化的理论基础上,采用3次样条插值函数来拟合原直方图,并以拟合后的函数为规定化函数对原图进行直方图规定化变换。通过试验并与采用高斯函数进行规定化处理后的效果图进行对比分析,验证了该算法的有效性和实用性。     

基于多级三角形面积函数的傅里叶形状描述子

提出了一种用于形状检索的基于多级三角形面积函数的傅里叶描述子.对形状轮廓上任一点,多级三角形面积函数通过轮廓的非等弧长分割计算得出,可以很好地描述形状的整体特征和局部细节特征.形状特征向量由多级三角形面积函数的低频傅里叶变换系数构成.在标准的MPEG-7形状图像库上对该方法进行了图像检索实验,并与已有的分别基于中心距离函数、面积函数、最远点距离函数、角度半径复函数、拱高半径复函数的傅里叶描述子以及混合傅里叶描述子进行了检索性能比较.实验结果表明,所提出的方法在相同查全率时具有最高的查准率,且具有较低的计算复杂度,证明该方法的有效性.      

A fast conformational search strategy for finding low energy structures of model proteins

We describe a new computer algorithm for finding low-energy conformations of proteins. It is a chain-growth method that uses a heuristic bias function to help assemble a hydrophobic core. We call it the Core-directed chain Growth method (CG). We test the CG method on several well-known literature examples of HP lattice model proteins [in which proteins are modeled as sequences of hydrophobic (H) and polar (P) monomers], ranging from 20-64 monomers in two dimensions, and up to 88-mers in three dimensions. Previous nonexhaustive methods--Monte Carlo, a Genetic Algorithm, Hydrophobic Zippers, and Contact Interactions--have been tried on these same model sequences. CG is substantially better at finding the global optima, and avoiding local optima, and it does so in comparable or shorter times. CG finds the global minimum energy of the longest HP lattice model chain for which the global optimum is known, a 3D 88-mer that has only been reachable before by the CHCC complete search method. CG has the potential advantage that it should have nonexponential scaling with chain length. We believe this is a promising method for conformational searching in protein folding algorithms.     

Early myeloid cell-specific expression of the human cathepsin G gene in transgenic mice

The human cathepsin G (CG) gene is expressed only in promyelocytes and encodes a neutral serine protease that is packaged in the azurophil (primary) granules of myeloid cells. To define the cis-acting DNA elements that are responsible for promyelocyte-specific "targeting," we injected a 6-kb transgene containing the entire human CG gene, including coding sequences contained in a 2.7-kb region, approximately 2.5 kb of 5' flanking sequence, and approximately 0.8 kb of 3' flanking sequence. Seven of seven "transient transgenic" murine embryos revealed human CG expression in the fetal livers at embryonic day 15. Stable transgenic founder lines were created with the same 6-kb fragment; four of five founder lines expressed human CG in the bone marrow. The level of human CG expression was relatively low per gene copy when compared with the endogenous murine CG gene, and expression was integration-site dependent; however, the level of gene expression correlated roughly with gene copy number. The human CG transgene and the endogenous murine CG gene were coordinately expressed in the bone marrow and the spleen. Immunohistochemical analysis of transgenic bone marrow revealed that the human CG protein was expressed exclusively in myeloid cells. Expression of human CG protein was highest in myeloid precursors and declined in mature myeloid cells. These data suggest that the human CG gene was appropriately targeted and developmentally regulated, demonstrating that the cis-acting DNA sequences required for the early myeloid cell-specific expression of human CG are present in this small genomic fragment.     

Absorption, distribution and excretion of 14C-cefatrizine (14C-S-640 P) in rat (author''s transl)

The reliability and rapidity of methods utilizing radioimmunoassay ( RIA) for detecting chorionic gonadotropin (CG) and estrogens in plasma, competitive protein binding assay for plasma progestins, and the hemagglutination inhibition test for urinary CG in the diagnosis of early pregnancy was evaluated in baboons. The hemagglutination inhibition test for detection of urinary CG did not give satisfactory results as late as Day 25 of pregnancy. Confirmation of pregnancy could not be established on Days 8 and 12 of pregnancy by RIA of estrogens, progestins, or CG. However, detection of plasma CG by RIA was 96.6% successful by Day 16, though the method was time-consuming. However, the determination of plasma estrogens and progestins by RIA was determined more quickly on Day 16, and gave equally successful results as the RIA for CG.     

Magnetic resonance microimaging of carious teeth

Three-dimensional (proton) magnetic resonance microimages of a number of extracted teeth (both healthy and carious) were obtained using a Bruker AM300WB magnetic resonance spectrometer fitted with a Bruker microimaging attachment. Full data sets have been acquired as 90-micron 3 voxels to enable high-quality full-surface (external and internal) reconstructions to be computed. Possession of such data has allowed mapping of the complete range of intensities in any selected image slice. The application of artificial color was found to aid the interpretation of both image types. All teeth showed the expected dental morphologies. The carious regions of the diseased teeth gave an intense image that was readily distinguishable from the other soft tissue.     

On the analysis of grain size in bulk nanocrystalline materials via x-ray diffraction

The Warren-Averbach (WA) analysis and other simplified methods that are commonly used to determine the grain size of nanocrystalline materials are discussed in terms of accuracy and applicabilities. The nanocrystalline materials used in the present study are prepared by cryomilling of A1 powders and subsequent consolidation (hot isostatic pressing and extrusion). Transmission electron microscopy observations of the as-extruded nanocrystalline A1 reveal a bimodal distribution of grain sizes centered around 50 to 100 nm and 250 to 300 nm. It is shown that the grain size determined by the WA analysis agrees with the lower bound grain size (e.g., 50 to 100 nm) observed experimentally. In the case of the integral method, it is useful to use a parabolic (Cauchy-Gaussian (CG)) relationship to approximate instrumental broadening and separate the intrinsic broadening. Compared to the Cauchy-Cauchy (CC) and Gaussian-Gaussian (GG) approximations, this is shown to give the best results. In addition, the reliability of the Scherrer equation is also discussed.     

Atopy and enteroparasites

There are not many studies about the intestinal parasitosis (IP) and atopic asthma (AA) relationship, and these show discordant results, possibly due to different studies design and differences in population selection. On the basis of personal results obtained by an epidemiological inquiry designed to estimate the prevalence of enteroparasitoses in asthmatic children and vice vesa, the aim of this study was to compare the prevalence of IP in AA and in a control group (CG) by a cross sectional study using clinical and laboratorial parameters, applied to 63 children (47 with AA and 16 in CG) aged 6 to 11 years, 37 males and 26 females, Caucasians, with the same socioeconomical conditions, consecutively selected in our Hospital. The results showed: The IP in AA children was 21.3%; the IP in CG was 25%; in the group with AA and IP, 40% of them had symptomology of IP; in the CG with IP, 100% had symptoms. CONCLUSIONS: The IP prevalence in AA was not statistically different from the IP in CG (p > 0.05) More data are needed to clarify the significant differences between the symptomatology rates of IP in asthmatic and non asthmatics; the reduced number of patients with symptoms in AA may reflect modulation of IP in AA and/or different parasite load.     

Mscomm32.ocx控件在计量称重系统中的应用

文章简介了8142称重显示仪,详细介绍了Mscomm32.ocx串行通讯控件的属性以及在运用Power-Builder 8.0编程过程中代码的实现情况。     

Representing clinical narratives using conceptual graphs

The analysis of medical narratives and the generation of natural language expressions are strongly dependent on the existence of an adequate representation language. Such a language has to be expressive enough in order to handle the complexity of human reasoning in the domain. Sowa's Conceptual Graphs (CG) are an answer, and this paper presents a multilingual implementation, using French, English and German. Current developments demonstrate the feasibility of an approach to natural Language Understanding where semantic aspects are dominant, in contrast to syntax driven methods. The basic idea is to aggregate blocks of words according to semantic compatibility rules, following a method called Proximity Processing. The CG representation is gradually built, starting from single words in a semantic lexicon, to finally give a complete representation of the sentence under the form of a single CG. The process is dependent on specific rules of the medical domain, and for this reason is largely controlled by the declarative knowledge of the medical Linguistic Knowledge Base.