基于三模冗余服务器的数据通信技术的研究与实现

以三模冗余服务器为基础，提出了一种运用于三模冗余服务器上的数据通信方法。这种通信方法紧密联系三模冗余服务器的硬件特征，结合三种常用的数据通信方法，共同完成了在不同冗余模块间数据传递的任务。该方法发挥了这三种数据通信技术固有的面向连接，高可靠，双工传送，读写互斥等优点，实现了在系统中可靠、高效传送数据的任务。     

真空预压相关问题及发展趋势

根据真空预压机理从理论上探讨了真空预压时地下水位的变化情况,提出了量测真空预压工程中地下水位的新方法,分析了真空预压的有效加固深度,评价了真空预压过程中土体侧向位移对边界地基强度的影响,并提出了具体的防护措施。在分析真空预压技术特点的基础上预测了真空预压技术的应用前景。     

基于元数据管理的数据共享研究

以实现空间数据的标准化为目的，实现数据的共享为前提，指出传统的数据共享模式存在着弊端，需要建立基于元数据管理的共享机制，同时提出了元数据管理的策略，这对于解决数据共享中的异地异构存储是有借鉴意义的，这一思想可以在数字山东的数据共享中得以实施和应用。     

预应力混凝土试验路的施工

介绍了预应力混凝土试验路的材料选择、基层顶面处理、纵向预应力钢筋张拉、锚具张拉、浇筑等工序，并对施工中有关问题进行了论述。     

多元回归分析的间接平差算法

回归分析是利用大量的观测数据来确定变量之间相关关系的一种数学方法。但在求回归系数时计算复杂，易出错。提出用间接平差的方法来计算回归系数，简化了计算过程。给出了一套计算方法，并通过计算实例验证了该方法的有效性。     

轮机工程专业船舶电气教学改革探讨

随着我国轮机人员“机电合一”,以及海船船员适任考试新大纲的施行,对轮机人员船舶电气方面的知识要求越来越高,而毕业生尚不能完全满足要求的现象。本文分析了当前船舶电气课程教学中存在教材覆盖面不够、不能满足工作需要以及现有课程实践性差的问题,探讨了船舶电气教学改革的思路和方法。并针对性地对广东海洋大学轮机专业的船舶电气实验教学提出了自己的改进意见。     

Numerical simulation of aerodynamic performance of a couple multiple units high-speed train

In order to determine the effect of the coupling region on train aerodynamic performance, and how the coupling region affects aerodynamic performance of the couple multiple units trains when they both run and pass each other in open air, the entrance of two such trains into a tunnel and their passing each other in the tunnel was simulated in Fluent 14.0. The numerical algorithm employed in this study was verified by the data of scaled and full-scale train tests, and the difference lies within an acceptable range. The results demonstrate that the distribution of aerodynamic forces on the train cars is altered by the coupling region; however, the coupling region has marginal effect on the drag and lateral force on the whole train under crosswind, and the lateral force on the train cars is more sensitive to couple multiple units compared to the other two force coefficients. It is also determined that the component of the coupling region increases the fluctuation of aerodynamic coefficients for each train car under crosswind. Affected by the coupling region, a positive pressure pulse was introduced in the alternating pressure produced by trains passing by each other in the open air, and the amplitude of the alternating pressure was decreased by the coupling region. The amplitude of the alternating pressure on the train or on the tunnel was significantly decreased by the coupling region of the train. This phenomenon did not alter the distribution law of pressure on the train and tunnel; moreover, the effect of the coupling region on trains passing by each other in the tunnel is stronger than that on a single train passing through the tunnel.     

更换公路旧桥支座的顶升方案

对更换支座的方法进行了分析总结,并在河北省新乐市-沙河大桥施工中,提出了一种简单易行、节约投资的支座更换方法-兜子顶升法;对该法的设计、作用原理进行了阐述,并介绍了其施工过程,为今后更换桥梁支座提供参考.     

Classification decision tree algorithm assisting in diagnosing solitary pulmonary nodule by SPECT/CT fusion imaging

Objective To develop a classification tree algorithm to improve diagnostic performances of 99mTc-MIBI SPECT/CT fusion imaging in differentiating solitary pulmonary nodules (SPNs). Methods Forty-four SPNs, including 30 malignant cases and 14 benign ones that were eventually pathologically identified, were included in this prospective study. All patients received 99Tcm-MIBI SPECT/CT scanning at an early stage and a delayed stage before operation. Thirty predictor variables, including 11 clinical variables, 4 variables of emission and 15 variables of transmission information from SPECT/CT scanning, were analyzed independently by the classification tree algorithm and radiological residents. Diagnostic rules were demonstrated in tree-topology, and diagnostic performances were compared with Area under Curve (AUC) of Receiver Operating Characteristic Curve (ROC). Results A classification decision tree with lowest relative cost of 0.340 was developed for 99Tcm-MIBI SPECT/CT scanning in which the value of Target/Normal region of 99Tcm-MIBI uptake in the delayed stage and in the early stage, age, cough and specula sign were five most important contributors. The sensitivity and specificity were 93.33% and 78. 57e, respectively, a little higher than those of the expert. The sensitivity and specificity by residents of Grade one were 76.67% and 28.57%, respectively, and AUC of CART and expert was 0.886±0.055 and 0.829±0.062, respectively, and the corresponding AUC of residents was 0.566±0.092. Comparisons of AUCs suggest that performance of CART was similar to that of expert (P=0.204), but greater than that of residents (P<0.001). Conclusion Our data mining technique using classification decision tree has a much higher accuracy than residents. It suggests that the application of this algorithm will significantly improve the diagnostic performance of residents.     

急性肝衰竭大鼠血液及胃肠组织中胃动素、胃泌素含量的变化

目的探讨胃动素(MTL)、胃泌素(GAS)在急性肝衰竭(ALF)大鼠血液及胃肠组织中的含量变化及其与肝性胃肠功能障碍的相关性。方法用硫代乙酰胺(TAA)复制出ALF大鼠模型,观察其一般情况及肝脏生化指标,放射免疫分析法(RIA)测定其血液及胃肠黏膜组织中MTL和GAS的含量。结果①模型组大鼠血液及胃黏膜组织中MTL、GAS含量及肠黏膜组织中MTL含量明显升高,与正常对照组比较差异有统计学意义(P<0.01),肠黏膜组织中GAS含量下降,但无统计学意义;②直线相关分析显示,模型组血浆MTL、GAS含量与肝功能指标(ALT、AST)呈显著正相关关系(P<0.01);③模型组大鼠造模后(24、36、48h),随ALF病情及肝性胃肠功能障碍的进展,MTL、GAS含量呈进行性升高。结论血中MTL、GAS含量测定既可作为判断肝功能损伤的指标,亦可作为判断ALF时胃肠功能障碍的指标。