"The areal units (zonal objects) used in many geographical studies are arbitrary, modifiable, and subject to the whims and fancies of whoever is doing, or did, the aggregating."                                                                    …

区分DDD中的Domain, Subdomain, Bounded Context, Problem/Solution Space 译自: Domain, Subdomain, Bounded Context, Problem/Solution Space in DDD: Clearly Defined 领域驱动设设计是一种设计系统的方式,强调在领域专家和系统建造者之间创建一个通用的语言.著名的DDD原则包括:使用通用语言和确定隐性和显性. DDD中的有些概念并没有明确的定义,且高度隐晦.每个人…

Chapter 1: Building Abstractions with Procedures 2015-09-29 016 Preface of this chapter QUOTE: The acts of the mind, where in it exerts its power over simple ideas, are chiefly these three ...... (John Locke, An Essay Concerning Human Understanding).…

近期做了个JAVA工程师分类, JAVA工程师可能是市场上最多类的程序员:   初级JAVA工程师的基本要求 Good basic programming skills 良好基本编程技能 Foundational Java knowledge JAVA基础知识 Object-Oriented Programming 面向对象编程 Learning on the job  工作中持续学习 Following instructions and receiving feedback 听从指示与反馈 T…

本文讨论了使用增强现实(AR)技术的三维(3D)地理信息系统(GIS)和视频监视系统的集成.进行这种集成的动机是要克服常规视频监视系统面临的问题.关于哪个摄像机当前监视此类系统中哪个区域的明确信息:因此,对情况的洞察力在很大程度上取决于操作员的培训和经验.为了确保在具有多个摄像机的系统中完全协调和监视情况,有必要引入一个参考系统. GIS之所以成为一种自然的解决方案,是因为它不仅提供了坚实的基础事实,而且还提供了在某些视频监控应用中可能非常重要的语义信息.要将信息集成到GIS应用程序中,必须对该…

atitit.软件与sql设计模式原理与本质 大总结attialx总结v6 qc26.docx 1.1. 版本历史2 2. 设计模式是什么2 2.1. 模式就是在一种场合下对某个问题的一个解决方案."2 2.2. 模式只是行话.规则.编程技巧.数据结构--"2 3. 设计模式的优点3 3.1. 知识固化 知识沉淀 精华沉淀,最佳实践固化 文档固化3 3.2. 复用解决方案--通过复用已经公认的设计,我能够在解决问题时取得先发优势,而且避免重蹈前人覆辙3 3.3. 大部分情况下可以提升可…

In creating a database, normalization is the process of organizing it into tables in such a way that the results of using the database are always unambiguous and as intended. Normalization may have the effect of duplicating data within the database a…

Common Pitfalls In Machine Learning Projects In a recent presentation, Ben Hamner described the common pitfalls in machine learning projects he and his colleagues have observed during competitions on Kaggle. The talk was titled "Machine Learning Grem…

Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix such that its sum is no larger than k. Example: Given matrix = [ [1, 0, 1], [0, -2, 3] ] k = 2 The answer is 2. Because the sum of rectangle [[0, 1], […

IO is a problem difficult to handle in various of systems because it  always becomes a bottleneck in data transfer. in this section, I will introduce some Java classes for two categories of data transfer,  Bytes and Characters, those classes were inc…