饱和情形下带转移时间的开排队网络强逼近

本文借助概率论强逼近理论,得到了饱和情形下带转移时间的开排队网络强逼近,本文每台服务完的顾客在各个台之间的转移是需要时间的,从而推广了文献[1]中的模型。     

基于BP网络的两点边值问题的新型收敛算法

在最优控制中,控制率的求解往往最终化为一个两点边值问题(TPBVP)的求解。由于两点边值问题具有强耦合、非线性的特点,通常采用计算机迭代的方法来求取其数值解。但是几种常用方法均存在初始点不易选取和求解时间较长的缺点。本文结合神经网络及其误差反向传播的思想,在梯度下降法的基础上提出了一种求解两点边值问题的网络新型收敛算法。大量仿真结果表明该方法可有效改善迭代计算,提高了计算性能。     

Exploring Verbal,Visual and Schematic Learners' Static and Dynamic Mental Images of Scientific Species and Processes in Relation to Their Spatial Ability

The current study compared different learners’ static and dynamic mental images of unseen scientific species and processes in relation to their spatial ability. Learners were classified into verbal, visual and schematic. Dynamic images were classified into: appearing/disappearing, linear-movement, and rotation. Two types of scientific entities and their related processes were investigated: astronomical and microscopic. The sample included 79 female students from Grades 9 and 10. For the purpose of the study, three instruments were used. The Mental Images by Guided Imagery instrument was designed to investigate participants' visualization of static and dynamic mental images. The Water-Level Task was adopted to estimate participants' spatial ability. The Learning Styles Inventory was used to classify participants into verbal, visual and schematic learners. The research findings suggest that schematic learners outperformed verbal and visual learners in their spatial ability. They also outperformed them in their vividness of microscopic images; both micro-static and micro-dynamic images; especially in the case of appearing/disappearing images. The differences were not significant in the case of astronomical images. The results also indicate that appearing/disappearing images received the least vividness scores for all three types of learners.     

基于BP神经网络的大学生实践教学效果评价研究

实践教学是高等学校教学工作的重要组成部分,其中实践教学效果评价是保障高等学校实践教学质量的重要环节。针对高校大学生项目实践教学效果评价需求,构建项目实践教学效果评价指标体系,在此基础上设计调查问卷,利用网络问卷收集评价原始数据,通过Python进行数据预处理,并采用BP神经网络对某高校大学生项目实践教学效果实施评价,结果表明,该方法对于高校实践教学效果评价具有较强的实用性。     

论网络环境下的高校思想政治工作创新

网络条件下思想政治工作与传统思想政治工作相比，具有民主化、信息化、社会化等时代特征。现代网络技术为当代高校思想政治工作带来发展机遇的同时，也带来了严重的负面影响。因此，必须从如下几个方面创新高校思想政治工作机制：理顺管理体制；加强网络研究，探索传播规律；强化法制意识，规范网上行为；采用新的工作内容、方法和技术。     

试论高等教育创新的基本原则

目前 ,我国高等学校进一步扩大招生 ,为适应社会发展的需要各高校在课程设置、教学教法以及后勤社会化等方面都有所创新 ,进行了一系列的改革。我国高等教育的创新是高层次的创新 ,是国家创新体系的支柱和基础 ,它的创新可遵循一些基本原则 ,其中最主要的是个性培养原则、整体培养原则、动态化原则、实践性原则等     

刑事诉讼电子证据的关联性问题研究

电子数据是2012年《刑事诉讼法》所规定的独立证据种类,可以用于证明案件事实的电子数据被称为电子证据。在实际司法实践中,立法的缺失、理论研究的不足以及技术手段的不成熟,导致电子证据存在大量关联性认证困难的问题。以类案分析和个案探讨相结合的方式,重点对电子证据的关联性问题展开分析论述,并提出可操作性建议,以期充分实现电子证据在新时期违法犯罪活动中的最大价值。     

管理信息系统的报表统计策略

总结了在管理信息系统开发中一般报表统计的常规策略，并特别针对育龄妇女管理信息系统中报表统计处理数据量大、统计速度慢等难点和关键问题，给出其报表统计模块的具体实现方法。     

DNA生物大分子的动力学特性与生物功能(Ⅱ)

对ＤＮＡ中激发的孤立子进行了分类，同时也研究了它的一些特点．我们着重研究了用此理论解释ＤＮＡ的基本生物功能──复制和转录及遗传与变异等问题．     

Hip and upper extremity kinematics in youth baseball pitchers

The purpose of this study was to examine the relationship between dynamic hip rotational range of motion and upper extremity kinematics during baseball pitching. Thirty-one youth baseball pitchers (10.87 ± 0.92 years; 150.03 ± 5.48 cm; 44.83 ± 8.04 kg) participated. A strong correlation was found between stance hip rotation and scapular upward rotation at maximum shoulder external rotation (r = 0.531, P = 0.002) and at ball release (r = 0.536, P = 0.002). No statistically significant correlations were found between dynamic hip rotational range of motion and passive hip range of motion. Hip range of motion deficits can constrain pelvis rotation and limit energy generation in the lower extremities. Shoulder pathomechanics can then develop as greater responsibility is placed on the shoulder to generate the energy lost from the proximal segments, increasing risk of upper extremity injury. Additionally, it appears that passive seated measurements of hip range of motion may not accurately reflect the dynamic range of motion of the hips through the progression of the pitch cycle.