Automated Classification to Improve the Efficiency of Weeding Library Collections

Previous studies have shown that weeding a library collection benefits patrons and increases circulation rates. However, the time required to review the collection and make weeding decisions presents a formidable obstacle. This study empirically evaluated methods for automatically classifying weeding candidates. A data set containing 80,346 items from a large-scale weeding project running from 2011 to 2014 at Wesleyan University was used to train six machine learning classifiers to predict a weeding decision of either ‘Keep’ or ‘Weed’ for each candidate. The study found statistically significant agreement (p?=?0.001) between classifier predictions and librarian judgments for all classifier types. The naive Bayes and linear support vector machine classifiers had the highest recall (fraction of items weeded by librarians that were identified by the algorithm), while the k-nearest-neighbor classifier had the highest precision (fraction of recommended candidates that librarians had chosen to weed). The variables found to be most relevant were: librarian and faculty votes for retention, item age, and the presence of copies in other libraries.     

完善区域知识产权金融服务推进机制的对策研究

推进知识产权金融服务的发展是践行创新驱动发展战略的重要方式。浙江省知识产权金融服务主要集中在专利权与商标权质押贷款、专利保险等方面,知识产权金融服务工作具有其特点;在知识产权金融政策支持上,各地也采取了许多因地制宜的举措。针对浙江省知识产权金融服务发展存在的问题,建议从建立知识产权出资服务机制,完善企业和金融机构需求对接机制,完善知识产权金融风险管理机制,完善政府知识产权金融引导机制等方面加以改进。     

A systematic review of propulsion from the flutter kick – What can we learn from the dolphin kick?

Propulsion, one of the most important factors in front crawl swimming performance, is generated from both the upper and lower limbs, yet little is known about the mechanisms of propulsion from the alternating movements of the lower limbs in the flutter kick (FK). The purpose of this systematic review was to review the literature relating to the mechanisms of propulsion from FK in front crawl. There was limited information about the mechanisms of propulsion in FK. Since movements of the lower limbs are similar between FK and the dolphin kick (DK), mechanisms of propulsion from DK were reviewed to better understand propulsion from FK. Recent evidence suggests that propulsion in DK is generated in conjunction with formation and shedding of vortices. Similar vortex structures have been observed in FK. Visualisation and simulation techniques, such as particle image velocimetry (PIV) and computational fluid dynamics (CFD), are non-invasive tools that can effectively model water flow without impacting swimming technique. These technologies allow researchers to estimate the acceleration of water and, consequently, the propulsive reaction forces acting on the swimmer. Future research should use these technologies to investigate propulsion from FK.     

大跨度混凝土连续梁桥分段施工技术探讨

混凝土连续梁桥的分段施工有四种不同的方法,不同的方法都有其自身的特点.在详细论述四种分段施工方法的基础上,阐述了各方法的优缺点及其适用范围,为混凝土连续梁桥及相关类型桥梁的设计与施工提供有益的参考.     

不同月龄兔半月板通道系统的扫描电镜(SEM)研究

采用扫描电镜的方法,除了观察到以前学者所发现的半月板的滑膜被覆、胶原纤维等,也观察到半月板表面有孔状结构,其内部胶原纤维间及胶原纤维束间有小孔或空隙存在。因此,据此实验结果提出"半月板管道系统"理论,进而提出半月板营养获得的"滑液推动系统"理论。     

整体观视野下档案安全保障体系的推进研究

档案安全保障体系整体化发展要求档案安全保障平台建设必须打破部门的限制,实现跨系统、跨部门、跨领域的共建共享和联合。为推动档案安全保障体系的研究和发展,档案安全保障体系建设必须立足于整体,树立整体化风险管理,兼顾档案安全保障体系各要素的发展,整合资源,发挥整体和部分的协同作用,建立起系统、高效的档案安全防护体系。