视频组播分层解决方案的研究

组播作为一种节约网络带宽、降低网络负载的有效手段,在视频传输中具有广阔的应用前景。本文针对组播中的会话内公平性问题,深入研究了多速率组播分层解决方案的实现机制,并基于目前的研究现状和进展指出了分层组播现存的有关问题。同时为分析分层解决方案在解决组播会话内公平性问题中的有效性,文中通过网络仿真器NS进行了实验评价。     

Magnetically encoded 3D mesostructure with high-order shape morphing and high-frequency actuation

Inspired by origami/kirigami, three-dimensional (3D) mesostructures assembled via a mechanics-guided approach, with reversible and maneuverable shape-morphing capabilities, have attracted great interest with regard to a broad range of applications. Despite intensive studies, the development of morphable 3D mesostructures with high-order (multi-degree-of-freedom) deformation and untethered high-frequency actuation remains challenging. This work introduces a scheme for a magnetically encoded transferable 3D mesostructure, with polyethylene terephthalate (PET) film as the skeleton and discrete magnetic domains as actuation units, to address this challenge. The high-order deformation, including hierarchical, multidirectional and blending shape morphing, is realized by encoding 3D discrete magnetization profiles on the architecture through ultraviolet curing. Reconfigurable 3D mesostructures with a modest structural modulus (∼3 GPa) enable both high-frequency (∼55 Hz) and large-deformation (∼66.8%) actuation under an alternating magnetic field. Additionally, combined with the shape-retention and adhesion property of PET, these 3D mesostructures can be readily transferred and attached to many solid substrates. On this basis, diverse functional devices, including a switchable colour letter display, liquid mixer, sequential flashlight and biomimetic sliding robot, are demonstrated to offer new perspectives for robotics and microelectronics.     

推动广东省先进制造业和现代服务业融合发展

广东作为制造业大省,在先进制造业与现代服务深度融合发展方面先试先行,经过一系列行之有效的政策举措,两业融合发展取得一定进展,但在两业融合发展推进过程中也面临诸多困难和挑战.在国际贸易保护主义上升、全球市场萎缩、新冠疫情蔓延的外部环境下以及新一轮科技革命和产业变革的激烈角逐中,如何促进产业间配合、推动制造业和服务业融合发...     

Emerging hemostatic materials for non-compressible hemorrhage control

Non-compressible hemorrhage control is a big challenge in both civilian life and the battlefield, causing a majority of deaths among all traumatic injury mortalities. Unexpected non-compressible bleeding not only happens in pre-hospital situations but also leads to a high risk of death during surgical processes throughout in-hospital treatment. Hemostatic materials for pre-hospital treatment or surgical procedures for non-compressible hemorrhage control have drawn more and more attention in recent years and several commercialized products have been developed. However, these products have all shown non-negligible limitations and researchers are focusing on developing more effective hemostatic materials for non-compressible hemorrhage control. Different hemostatic strategies (physical, chemical and biological) have been proposed and different forms (sponges/foams, sealants/adhesives, microparticles/powders and platelet mimics) of hemostatic materials have been developed based on these strategies. A summary of the requirements, state-of-the-art studies and commercial products of non-compressible hemorrhage-control materials is provided in this review with particular attention on the advantages and limitations of their emerging forms, to give a clear understanding of the progress that has been made in this area and the promising directions for future generations.     

略论独立学院教师的定位及职业意识

随着我国高等教育大众化步伐的进一步加快,独立学院已从以规模求生存进入以质量求生存阶段。在这一转型过程中,除必要的硬件投入外,软环境管理显得尤为重要,其中教师队伍建设最为迫切,尤其是教师队伍对独立学院的认识问题。以如何做好一名独立学院教师为出发点,多视角讨论了独立学院的教师应该具备的职业意识。     

按收入比例偿还国家助学贷款的SWOT分析

澳大利亚高等教育贡献方案中确立的按收入比例还款计划由于保障了低收入者的利益、回收率高等特点而成为各国竞相效仿的对象。目前我国的国家助学贷款仍然主要采取定期定额还款的方式,按收入比例还款未被纳入正轨的贷款回收系统之中,使得按收入比例这种还款方式难以发挥自身的优势。     

基于知识管理的IT项目风险研究

首先从知识管理角度分析IT项目的基本特征,在此基础上阐释知识管理环境下的IT项目风险：战略风险、知识资产风险、组织结构风险、信息技术风险、文化风险、创新激励风险,最后从目标、组织、信息系统、方法四个方面提出了基于知识管理的IT项目风险管理应对策略。     

环境影响评价与环境工程教学实践

文章提出开展对建设项目的环境影响评价,提高了教师的理论水平和解决实际环境污染问题的能力,丰富了环境工程课堂教学内容,促进了科研水平提高,带动了本科生污染源调查实习和毕业实习,拓展了毕业论文选题空间和研究内容。     

偷换二维码的刑法定性

针对偷换二维码案件定性问题,学界主流观点认为构成三角诈骗,但三角诈骗说的缺陷在于,其弱化了商家与顾客的互动关系中商家的作用,忽视了商家对顾客支付行为的影响力。商家由于行为人的置换行为陷入认识错误,而顾客并不具有重要的认识错误。在二维码案件中,行为人的置换行为导致商家作出错误的指示行为,商家的指示行为支配顾客的扫码支付行为。置换行为属于实行行为,指示行为属于诈骗罪中的处分行为,而扫码支付行为并不因二维码的置换而产生影响,因而并不具有规范意义。     

双一流高校图书馆新媒体运营与评价——基于WCI的微信阅读推广实证研究

[目的 /意义]评价新媒体环境下高校图书馆利用微信公众号进行营销和阅读推广的实际效果,综合反映高校图书馆微信营销与传播的影响力.[方法/过程]运用网络计量学中的微信传播指数WCI统计分析方法,选取国内有代表性的"双一流"A类36所高校作为研究对象,构建高校图书馆新媒体运营绩效评价评估模型,根据综合影响力结果排名分析现状...