基于IBL算法的CBR系统中索引与检索机制研究

文章介绍了基于示例学习算法IBL的概况,并对其加以改进,提出了一个新的算法IBL－Cluster。它主要由概念描述形成算法和概念描述修改算法构成。在此基础上建立了应用在基于事例的推理系统CBR中的基于IBL算法的索引与检索机制。实验表明新算法IBL－Cluster在存储空间及测试正确率方面均有改善。     

HDR图像测量天空亮度及在动态采光模拟中应用

为解决在通用天空模型下进行建筑采光模拟所得到的结果准确程度不高的问题,尝试使用实测的天空亮度分布HDR图像作为光源进行建筑采光/动态采光模拟并对该方法进行了验证.首先,说明了通过高动态范围(HDR)图像测量天空亮度分布的方法;进而,介绍并验证了基于图像的采光/动态采光模拟(IBL):既使用HDR图像作为光源输入数值进行采光模拟的方法.验证实验于2017年7月4日至7月10日及2017年8月3日至8月12日进行,通过实测与模拟结果的比较分析验证了HDR图像测量天空亮度分布以及基于图像的采光模拟的准确程度.最后,文中讨论了基于天空数学模型的采光模拟以及基于图像的采光模拟的优缺点.结果表明:通过HDR图像可以准确地测量天空亮度分布;基于图像的采光模拟准确度良好,同一时刻模拟值与实测值之误差集中分布在-15%~47%范围之内;基于图像的动态采光模拟所求取的100 lxUDI3 000 lx指标值最大误差限制于±25%以内.     

Chitosan—A versatile semi-synthetic polymer in biomedical applications

This review outlines the new developments on chitosan-based bioapplications. Over the last decade, functional biomaterials research has developed new drug delivery systems and improved scaffolds for regenerative medicine that is currently one of the most rapidly growing fields in the life sciences. The aim is to restore or replace damaged body parts or lost organs by transplanting supportive scaffolds with appropriate cells that in combination with biomolecules generate new tissue. This is a highly interdisciplinary field that encompasses polymer synthesis and modification, cell culturing, gene therapy, stem cell research, therapeutic cloning and tissue engineering. In this regard, chitosan, as a biopolymer derived macromolecular compound, has a major involvement. Chitosan is a polyelectrolyte with reactive functional groups, gel-forming capability, high adsorption capacity and biodegradability. In addition, it is innately biocompatible and non-toxic to living tissues as well as having antibacterial, antifungal and antitumor activity. These features highlight the suitability and extensive applications that chitosan has in medicine. Micro/nanoparticles and hydrogels are widely used in the design of chitosan-based therapeuticsystems. The chemical structure and relevant biological properties of chitosan for regenerative medicine have been summarized as well as the methods for the preparation of controlled drug release devices and their applications.     

一种裸眼井壁几何模型的构造方法

为检验裸眼井用测井仪器拖动器的越障性能,构造一种裸眼井壁的几何模型.比较Pro/E中几种基准曲线创建方法的优缺点,给出了Pro/E中构造裸眼井壁几何模型的建模流程.分析Pro/E中用于创建基准曲线的IBL文件格式,编制并验证了由数学软件Mathematica 6.0自动生成*.ibl文件的程序.某型拖动器越障仿真实例表明,该建模方法具有一定应用价值.