Your vision with and without trigonometry

When you take a look at anything close-by, your brain computes the position of the object you see by solving a lanky triangle — namely the one formed with the object and your two eyes as its vertices. The brain may call other clues also into service while figuring out positions, especially when the lanky triangles prove far too lanky to afford trigonometric solutions with reasonable accuracy. These non-trigonometric alternatives can run into occasional pitfalls, though. Yet even the trigonometric highway isn’t always foolproof, either. We shall see in what follows that the resulting consequences can be as instructive as they are amusing.     

175 Years of linear programming

The theory of flows in networks began to evolve in the early 1950’s.The various linear optimisation questions that could be asked of flows in conserving networks turned out to be neat combinatorial specialisations of linear programming. The simplex method (and its variants) turned out to have very pretty combinatorial interpretations on networks. The algebraic dexterity of linear programming duality led to a unified treatment of many deep theorems in graph theory and combinatorics. In this part, the last of the series on linear programming, we will see glimpses of the theory of network flows through a specific flow optimisation problem — the maximum flow problem.     

运动对肝脏的影响(综述)

本文综合阐述了运动对肝脏功能和形态结构的影响,运动对肝脏功能的影响主要表现在对肝脏中各种酶的功用的影响,同时肝细胞的形态结构也会因运动发生相应的变化,亦可致使肝功能发生异常甚至发生病变。     

协同神经网络立体图像识别方法

基于前人在协同神经网络的相关研究,本文提出了立体图像的原型向量的构造方法——立体像素平铺法和投影截面法,并给出了投影截面法的优化方法。     

改进的支持向量机在微博热点话题预测中的应用

为了提高微博舆情的预测精度,针对不同单一核函数的局限,用线性拟合确定两种核函数的权重提出改进的支持向量机模型。首先利用马尔科夫模型矩阵的稀疏程度提取影响因子指标,得到微博传播的增减趋势;然后用改进的支持向量机对实时数据按照4∶1的比例划分测试集和训练集,进行实时预测与警示。实验结果表明：应用马尔科夫模型进行微博舆情的主成分提取效果较佳,改进的支持向量机构造了新的组合核函数,比传统的预判效果更佳。     

亚洲武技的民族文化与价值特征——东西方体育文化的比较研究

亚洲武技深蕴亚洲社会传统的宗法礼教观念和重人伦、讲武德、注重身心统一发展的民族文化特性。亚洲武技的功能与世界最新体育价值取向有着趋同和契合,将在人类未来社会文化体系与生活方式中占据重要位置。     

Some approaches to modeling complex information systems

State-of-the-art of modeling complex information systems is briefly discussed. A distinction is made between macrolevel and microlevel modeling of such systems. Modeling approaches and techniques, appropriate for each of these two levels are described and assessed.     

中国与欧美档案学生成背景的比较研究

本文从形成时的直接动因、研究对象、研究目的、理论来源及研究主体五个方面对中国与欧美档案学展开比较研究,以期系统的梳理中国与欧美档案学在生成背景上的差异.     

掌上电视：移动电视产业的新主角

掌上电视是一项移动电视新业务,和以前的移动电视业务手机电视、车载移动电视相比,具有技术成熟、信号接受质量好、收视费用低、产业链更容易完善等优势。由于掌上电视潜在的用户群体庞大,使掌上电视业务蕴涵巨大的商机,是移动电视产业新的经济增长点。     

酒店员工满意度模糊综合评价体系构建

酒店经常出现"员工荒"的现象,酒店管理者在日常管理中须以"人本管理"思想来获得企业的持续发展。酒店业要获得持续发展,员工的满意度是一个越来越不容忽视的问题。在此背景下尝试用模糊综合评价法建立评价酒店员工满意度的模型,并结合实例说明该模型的应用。