Automated soil resources mapping based on decision tree and Bayesian predictive modeling

INTRODUCTION Land resources management and ecologicalenvironmental decision-making requires knowl-edge about the spatial distribution, and quantity andquality of soil resources. Soil maps have tradition-ally been made by interpretation of remotely sensedimagery supported by ground surveys. Thus, soilmapping becomes expensive, labor-intensive, andtime-consuming exercises. Moreover, it also issubjective, and may result in inconsistencies in theassignment of soil type boundaries or nam…     

选区激光烧结(SLS)成型CAD模型工艺分析

Production models and parts can be obtained with a CAD model of rapid prototyping technology. Because of the characteristics of rapid prototyping with SLS (selective laser sintering), hardness and strength of the forming parts are not very high. Usually these forming parts are used for testing new products, casting complicated shape, and making various inexpensive molds and dies. In a rapid prototyping process, building a CAD model is required.     

数学建模课内容和教学方法的探索

数学建模课程的开设以及如何组织教学,如何培训学生参加竞赛一直是近几年来高校的热点。本文根据我们几年来的实践摸索,就数学建模课程的内容设置,以及教学方法、培训方法的经验作一些简单介绍,以期对广大有兴趣的老师和学生有所帮助。     

The Relationship Between Homework and Achievement—Still Much of a Mystery

Despite the long history of homework and homework research, the role that homework plays in enhancing student achievement is, at best, only partly understood. In this review, we give an overview of twentieth-century homework research and discuss the reasons why the relationship between homework and achievement remains unclear. We identify the operationalization of homework and achievement and the problematic handling of hierarchically ordered data as two important factors affecting the validity of many of the studies performed over the last century. We then describe a new generation of homework studies using multilevel modeling to deal with hierarchically nested data. Finally, we argue that homework research should be more closely connected to well-founded psychological theories of learning and instruction, and we offer three potential links (theories of instruction time, self-regulation theory and expectancy-value theory, and teaching behavior).     

在小型个人项目中应用RUP和UML

RUP是先进实用的软件开发过程，UML是功能强大的可视化建模语言，二者的结合在面向对象软件工程技术中应用广泛。目前在大型复杂软件系统的开发中使用RUP和UML的较多。本文以开发一个抽奖程序为例，描述了如何在小型个人项目中应用RUP和UML。     

Tensions between knowledge transmission and student-focused teaching approaches to assessment purposes: helping students improve through transmission

This study surveyed 1064 Chinese school teachers’ approaches to teaching and conceptions of assessment, and examined their inter-relationship using confirmatory factor analysis and structural equation modeling. Three approaches to teaching (i.e. Knowledge Transmission, Student-Focused, and Examination Preparation) and six conceptions of assessment (i.e. Student Development, Teaching Improvement, Examination, Control, School Accountability, and Irrelevance) were identified. Teachers indicated they used Student-Focused most frequently and this positively predicted the assessment purposes of Student Development and Teaching Improvement, while loading negatively on Control, School Accountability, and Irrelevance. The Knowledge Transmission teaching approach, in contrast, positively predicted the assessment purposes of Examination, School Accountability, Control, Student Development, and Teaching Improvement. Thus, despite a predominantly student-focused approach to teaching, knowledge transmission was seen as a teaching approach that contributed positively to student learning. Possible explanations for this anomalous result are discussed.     

学科视野下的图书馆知识管理研究

通过对图书情报方面文献分析后,梳理出目前国内图书馆知识管理研究的发展方向,提出建立采访信息来源中心、读者需求与用户管理中心、员工管理与继续教育中心、文献开发利用中心、馆际合作中心的图书馆知识管理实施方案。     

大型溶洞旅游开发中三维建模测绘技术及应用

溶洞旅游是旅游行业的一个重要组成部分,其具有稀缺性与不可复制性的特点。溶洞旅游开发过程中需要注意开发与保护的统一,传统测绘手段只能为设计单位提供2D数字绘图,不能详细反映溶洞内部细节情况,因此设计单位在设计时可能出现在某些空间上把握不准确,造成空间浪费甚至溶洞内部资源损坏的情况。借助地面三维激光扫描系统,通过前期控制测量,将扫描仪安置在控制点上对溶洞内部进行高精度扫描。以云南某溶洞旅游景区开发项目为例,阐述三维激光扫描技术在地下溶洞旅游开发中的具体应用,包括前期现场准备及作业方法、点云数据处理、复杂表面3D建模、精度评定、作业效率分析及经验总结等,以期为溶洞旅游开发提供一定参考。     

模糊时间序列分析初探

对模糊时间序列建模问题进行了理论探讨，给出了一种求参和定阶的方法.     

基于物理属性和粒子系统的自然景物建模方法实践

In virtual environment construction of natural scenes, high realism of the scenes and real time control to the objects in the scene are needed. With a modeling method based on physical properties and a particle system, together with a mipmapping texture technique, good integration between realism and real time control of the natural scenes such as clouds and smoke can be obtained. This paper briefly introduces the basic theory of particle system first, and then describes the construction method of a cloud and smoke particle system. By changing the values of physical properties in the particle system, different shapes and motion status of cloud and smoke result. With a mipmapping technique, real time control and variety of the scenes are improved. Finally an example showing implementation of this method is presented.