混合策略改进鲸鱼优化算法

针对标准鲸鱼优化算法（whale optimization algorithm,WOA）易陷入局部最优解、收敛精度低、收敛速度慢等问题,提出一种利用混合策略改进的鲸鱼优化算法（multi-strategy improved whale optimization algorithm,MSIWOA）。首先采取精英反向策略初始化种群,提高初始种群质量;其次,采取卡方分布的逆累积分布函数更新收敛因子以实现全局探索和局部开发的平衡;然后利用改进氏族拓扑结构强化种群的全局探索能力,并提高算法收敛速度;最后采取Circle映射产生混沌解,结合贪婪策略保留较优解,以帮助种群跳出局部最优解。通过对10个基准测试函数以及CEC2019测试函数进行仿真实验,结果表明,MSIWOA在收敛精度和收敛速度上均有较明显的提升。     

基于PDCA循环提高高职教学质量管理研究与探索

由于近年来高职院校迅速发展但教学质量并未得到同步提升,于是引入一种科学有效的质量管理方法——PDCA循环,运用PDCA循环中的四个阶段:"计划(Plan)、实施(Do)、检查(Check)、处理(Action)",对高职院校的教学质量进行全过程的管理,探索高职院校教学质量管理方法,提高教学质量。     

传统校园建筑文化的思索：武汉大学教工活动中心设计随感

文章通过对武汉大学教工活动中心的设计,认为对传统校园建筑文化的继承和发展不是简单的形式转换和符号延而应在理解历史和文化内涵的前提下创造性的发展,以适应特定环境及当今技术与社会和审美的需要。     

测设复合曲线方法

介绍一种复合曲线的简便测设方法,利用一个测站点同时测设复合曲线的中心线、内外边线,主点和细部点同步测设,并具有放样数据计算方便,操作简便,点位精度高,速度快,效率高等优点,对工程实践有参考价值.     

直方图背景建立算法及应用

文中提出基于道路场景图像灰度分布时域统计特征建立视频交通检测背景图像的方法.对该方法的基本原理详细分析,对该方法的实现方式进行说明.通过对实验结果的分析,证明该方法在工程实践中应用的可行性和可靠性.     

“高铁时代”的来临对安徽旅游的影响及对策

目前区位优势转换为旅游经济优势的中间环节——＂高铁＂的出现,为旅游业的腾飞带来了机遇。文章从＂高铁＂带来的＂小时旅游圈＂和＂同城效应＂等方面探讨了安徽省旅游经济由于交通格局的改变所带来的旅游市场的改变。     

Analytical solution for a circular roadway considering the transient effect of excavation unloading

The rocks surrounding a roadway exhibit some special and complex phenomena with increasing depth of excavation in underground engineering.Quasi-static analysis cannot adequately explain these engineering problems.The computational model of a circular roadway considering the transient effect of excavation unloading is established for these problems.The time factor makes the solution of the problem difficult.Thus,the computational model is divided into a dynamic model and a static model.The Laplace integral transform and inverse transform are performed to solve the dynamic model and elasticity theory is used to analyze the static model.The results from an example show that circumferential stress increases and radial stress decreases with time.The stress difference becomes large gradually in this progress.The displacement increases with unloading time and decreases with the radial depth of surrounding rocks.It can be seen that the development trend of unloading and displacement is similar by comparing their rates.Finally,the results of ANSYS are used to verify the analytical solution.The contrast indicates that the laws of the two methods are basically in agreement.Thus,the analysis can provide a reference for further study.     

PDCA循环原理在大学毕业生就业管理工作中的应用

如果把“大学毕业生就业工作”看作一个项目，那么应用项目质量管理理论中的PDCA循环原理，科学制定就业工作计划和目标，认真组织实施就业辅导和就业管理工作，及时检查就业结果，积极处理就业工作存在的问题，既可以强化当前大学毕业生就业工作的管理、也能够提高大学毕业生的就业质量。     

RTC树的构建与不确定近邻关系查询方法

空间索引结构和查询技术在空间数据库中具有重要的作用,针对已有的方法在复杂空间数据对象的近似和组织方面的局限性,提出了一种基于最小外接矩形(MBR)、梯形和圆的新的索引结构(RTC树).为了有效处理复杂空间数据对象的最近邻(NN)关系查询问题,提出了基于RTC树的最近邻查询(NNRTC)算法,NNRTC算法利用剪枝规则可减少节点遍历和距离计算.针对障碍物对数据集中最近邻的影响问题,提出了障碍物环境下的基于RTC树的最近邻查询(BNNRTC)算法,BNNRTC算法先在理想空间进行查询,再对查询结果进行判断.为了有效处理动态单纯型连续近邻链查询问题,进一步给出了基于RTC树的动态单纯型连续近邻链查询(SCNNCRTC)算法.实验结果表明,相对基于R树的查询方法,所提的方法在处理数据量较大的复杂空间对象的数据集时可提高60%~80%的效率.     

A new absolute stability test for systems with state‐dependent perturbations

In this paper, a new test for the absolute stability of nonlinear systems with state‐dependent nonlinearities is developed. Scalar nonlinearities are assumed to lie in sectors. Using a Lur'e function as a Lyapunov function, a linear matrix inequalities (LMI) stability condition is derived. The new condition lets one go from a pure integral (Persidskii) to a pure quadratic Lyapunov function in an unified framework. Several results available in the literature are generated as particular cases of the new test. An example shows that the proposed condition can be much less conservative than available diagonal stability and passivity based methods, as the circle and Popov criteria. Tests for infinite as well as finite nonlinearity sectors can be easily generated, since the parameters of the nonlinearity sectors appear in the LMI condition in a very convenient way. This feature can also provide optimization of the absolute stability sector through convex programming techniques. Copyright © 2002 John Wiley & Sons, Ltd.