Evaluation of wireless bat swing speed sensors

Batter swing speed is an important parameter in understanding the performance of baseball and softball players. A number of swing speed sensors have recently been introduced and are commercially available. The aim of this study was to compare three wireless swing sensors with high speed video. Swing speed from high speed video was measured by differentiating the position coordinates of tracking markers on the bat barrel. On average, the wireless bat swing sensors reported speeds 8% slower than that found from video tracking. The agreement was better at low swing speeds, suggesting that the current generation of wireless sensors is best suited for developing players. Spatial measures, such as swing angle, were not in good agreement with video tracking.     

医疗卫生信息公开政策的基本研究框架与制定协同动力模型构建

医疗卫生信息公开政策是政府信息公开政策体系的必要组成内容。在分析医疗卫生信息公开政策研究背景基础上探讨了医疗卫生信息公开政策内涵,界定了医疗卫生信息公开政策研究对象,从静态和动态两个层面分析了医疗卫生信息公开政策研究内容,并初步构建了面向"对象——内容"的医疗卫生信息公开政策基本研究框架。系统分析了医疗卫生信息公开政策制定协同动力因素,并提出了医疗卫生信息公开政策制定协同动力模型。     

科技情报大数据业务平台设计

[目的/意义]本文分析了目前大数据时代科技情报工作面临的问题和机遇,针对情报服务领域大数据服务模式进行了分析。[方法/过程]该论文结合信息技术领域的虚拟化技术、云平台技术、高性能技术和人工智能技术,设计了科技情报大数据业务平台架构,详细阐述了硬件层、虚拟层、支撑层和业务层主要功能和所需技术;并对大数据处理首要任务存储进行了探索,搭建了基于hadoop和hbase的大数据存储平台。[结果/结论]本文提出的大数据情报业务平台从整体架构进行了设计,并实现了存储模块,下一步实现分析和可视化部门,可以为情报的收集和处理提供大数据支撑服务。     

Cooperative surrounding control with collision avoidance for networked Lagrangian systems

This paper investigates the cooperative surrounding control problem for networked multi-agent systems with nonlinear Lagrangian dynamics. With the consideration of the target with constant and time-varying velocity, two cooperative surrounding control algorithms with collision avoidance are proposed, in which possible collision among agents is prevented so as to achieve a more reliable and safer performance. For the case when the target has a constant velocity, a velocity observer is designed firstly for each agent. Secondly, to handle the nonlinear dynamics and avoid collisions, the neural networks and potential functions are used for the controller design. Then, the cooperative surrounding control algorithm is proposed such that all the agents surround the target with the desired relative positions. For the case when the target has a time-varying velocity, the velocity observer is designed under the assumption that the target’s partial acceleration is known for each agent. Then, the cooperative surrounding control algorithm is proposed such that the surrounding error between the target and each agent is bounded. The main difference between these two algorithms is that the former can ensure the collision avoidance among target and agents, while the latter can do so only among agents because the target’s velocity is time-varying. The Lyapunov theory is used to prove the stability of the cooperative surrounding control algorithms. The simulation illustrates the effectiveness of the theoretical results.     

基于本体和关联数据的单元信息知识组织模式研究

[目的/意义]为满足用户多层次、多粒度的知识获取需求，图书馆文献资源组织的对象由文献单元逐步向知识单元转变。[方法/过程]文章在研究单元信息概念和表示模型的基础上，提出基于本体和关联数据的单元信息知识组织框架，并深入探讨了实现单元信息语义组织的核心步骤。以中医养生领域为例，阐述单元信息知识组织语义模型的应用过程。[结果/结论]本文构建的单元信息知识组织模式，是实现单元信息细粒度组织、语义化揭示以及多维度关联的有效途径。该研究可为特定领域单元信息的语义应用提供参考。     

媒体融合环境下高校图书馆阅读推广探索

[目的/意义]本文以媒介融合为视角，结合新媒体环境下读者阅读需求与高校图书馆阅读推广工作的实践，梳理了当前高校图书馆阅读推广工作现状，以期为高校图书馆基于媒体融合进行阅读推广提供了新的思路。[方法/过程]分析了现有高校图书馆阅读推广工作的不足，探究媒体融合环境下高校图书馆阅读推广发展趋势并提出相关措施。[结果/结论]高校图书馆可通过变革资源组织模式、加强数字多媒体宣传推广、投身数字资源的组织利用等措施，拓展阅读推广渠道，创新阅读推广方式，为我国高校图书馆的阅读推广工作提供借鉴。     

文化共享工程省级中心地方特色资源建设现状分析与思考

全国文化信息资源共享工程省级分中心网站特色资源的建设对中华优秀文化的传播起着非常重要的作用,它是人们了解和获取优秀地方文化的重要窗口。本文以共享工程各省级分中心网站地方特色资源库建设为调查对象,通过对各中心网站地方特色资源库的建设内容、易用情况、网上信息服务等的调查分析,指出了特色资源库在建设标准、信息服务、合作共建、用户参与等方面的不足,并针对这些问题提出了相应的改进意见和建议,为完善地方特色资源建设和服务提供参考。     

虚拟云桌面为高校图书馆服务和管理带来的革新——以中南民族大学图书馆为例

从虚拟云桌面技术的概念、特点及传统桌面应用现状出发,结合当前高校图书馆革新过程中面临的问题及管理、服务质量发展的瓶颈展开讨论;分析了虚拟云桌面技术在高校图书馆建设中的应用场景及优势所在;并以中南民族大学图书馆的虚拟云桌面建设方案为例,证实了虚拟云桌面应用的先进性和有效性,为高校图书馆发展可靠、灵活且可扩展的服务、管理模式提供了保障;最后提出了虚拟云桌面技术在未来高校发展中的若干建议和思考。     

Non-suicidal self-harm is linked to suicidal thoughts in Chinese adolescents with mood disorders: a cross-sectional report

Non-suicidal self-injury (NS SI) refers to any intentional,self-inflicted behavior that causes direct damage to body tissues (Kerr et al.,2010),and has emerged as a challenging public health issue worldwide,especially among adolescents.The most common presentations of NSSI include skin-cutting,severe scratching,and burning (Whitlock et al,2006).     

Layers of interstitial fluid flow along a “slit-shaped” vascular adventitia

Interstitial fluid(ISF) flow through vascular adventitia has been discovered recently. However, its kinetic pattern was unclear. We used histological and topographical identification to observe ISF flow along venous vessels in rabbits. By magnetic resonance imaging(MRI) in live subjects, the inherent pathways of ISF flow from the ankle dermis through the legs, abdomen,and thorax were enhanced by paramagnetic contrast. By fluorescence stereomicroscopy and layer-by-layer dissection after the rabbits were sacrificed, the perivascular and adventitial connective tissues(PACTs) along the saphenous veins and inferior vena cava were found to be stained by sodium fluorescein from the ankle dermis, which coincided with the findings by MRI. The direction of ISF transport in a venous PACT pathway was the same as that of venous blood flow. By confocal microscopy and histological analysis, the stained PACT pathways were verified to be the fibrous connective tissues, consisting of longitudinally assembled fibers. Real-time observations by fluorescence stereomicroscopy revealed at least two types of spaces for ISF flow:one along adventitial fibers and another one between the vascular adventitia and its covering fascia. Using nanoparticles and surfactants, a PACT pathway was found to be accessible by a nanoparticle of 100 nm and contained two parts: a transport channel and an absorptive part. The calculated velocity of continuous ISF flow along fibers of the PACT pathway was 3.6-15.6 mm/s.These data revealed that a PACT pathway was a "slit-shaped" porous biomaterial, comprising a longitudinal transport channel and an absorptive part for imbibition. The use of surfactants suggested that interfacial tension might play an essential role in layers of continuous ISF flow along vascular vessels. A hypothetical "gel pump" is proposed based on interfacial tension and interactions to regulate ISF flow. These experimental findings may inspire future studies to explore the physiological and pathophysiological functions of vascular ISF or interfacial fluid flow among interstitial connective tissues throughout the body.