一种新的快速视频图像边缘检测算法

一般常用的边缘检测算法计算量较大，对细小边缘检测效果较差，不适合实时边缘检测系统。针对这一问题，本文提出一种连续分割的快速边缘检测算法：从相互垂直两方向分割梯度图像，提取截面曲线极大值获得图像边缘，使用形态学梯度，检测出细小的图像边缘。实验结果表明此算法较Canny等经典算法减少了计算量，提高了边缘检测精度。     

用户生成内容使用与满足对品牌态度的影响研究——以音视频类用户生成内容为例

以媒体使用与满足理论和信息加工理论为研究基础,采集网络中的客观数据,通过内容分析法量化数据,利用多元线性回归和阶层回归验证理论模型。研究发现:音视频类用户生成内容的内部特征正向影响消费者对内容的使用和满足;音视频类用户生成内容的创作者声誉外部特征正向影响消费者对内容的使用与满足,而内容的推荐性未对消费者选择产生作用;音视频内容的使用与满足则直接影响消费者品牌态度的形成;内容的使用与满足在音视频类用户生成内容与消费者品牌态度之间起中介作用。     

招聘方式之四大趋势

企业要实现长远的发展,做好员工招聘工作是关键。当今人才市场的竞争日益激烈,企业也在逐渐采用一些新的的招聘方式,由此引发了一场新的人才招聘革命。何种招聘方式是企业最佳的人才获取渠道,目前基本上没有定论。企业只有根据自身的情况及实际需要,才能有效的选择出最适合自己的招聘方式。针对目前传统招聘方式存在的弊端,代理招聘、网络招聘、电话招聘和视频招聘日渐成为招聘方式的新趋势。     

Balancing risk with virtual private networking during a pandemic

When the pandemic struck and teaching went online worldwide, universities had to make pressing decisions that balanced cybersecurity against other factors, including health and safety, usability, and cost. One such challenge Indiana University (IU) faced was how to accommodate the secure telecommunications needs of 130,000 faculty, staff, and students who would now be teaching, learning, doing research, and working from home. Some universities reflexively promoted virtual private network (VPN) use for all activities. Such an approach would have been unsustainable at IU, however, owing both to the licenses and resources needed for the sheer number of users and to the high-throughput applications on which they rely. Perhaps even worse, it would have increased the chances that the VPN would be unavailable during a critical incident or other situation in which secure communications must be guaranteed. Instead, IU launched an awareness campaign demonstrating exactly when VPN use is and isn’t needed. In addition, network staff employed a VPN feature called split tunneling to reduce the load. This article discusses the advantages and disadvantages of this approach and how IU made the decision to balance both sides of the risk equation to ensure the continued advancement of its mission throughout the pandemic.     

Hands-off? Lessons from high-touch professionals about going virtual

The COVID-19 crisis has fundamentally changed how many businesses operate and connect with their customers. Previously unheard-of government restrictions and sheltering-in-place requirements forced most professional services to transition to remote delivery methods (e.g., email, telephone, video consults, Shopify storefronts). Providers of low-touch services (e.g., lawyers, accountants) naturally lent themselves to remote delivery; however, those that offer high-touch services, particularly those in healthcare (e.g., doctors, chiropractors, physical therapists), experienced a drastic change in working conditions when going virtual. Despite a long history of resistance to virtual delivery, the pandemic created an unprecedented incentive for these high-touch professionals to experiment with underutilized care models such as telehealth: the provision of healthcare services remotely using telecommunications technologies. We examine the rapid adoption of telehealth during COVID-19 through the coming together or convergence of previously unrelated technologies, spaces, and practices. Our analysis reveals opportunities and challenges associated with going hands-off that apply to many other professionals providing high-trust services. Specifically, we offer nine guiding principles for building and protecting cognitive and affective trust in virtual and hybrid delivery models. This is important given the pace of compounding technology convergences that lie ahead for service professionals.     

视频业务识别方法综述

视频用户体验的质量要求给网络传输带来了巨大挑战，未来的虚拟现实/增强现实(Virtual Reality/Augmented Reality，VR/AR) 视频业务则对交互时延提出了更高要求。视频业务识别是网络运营商及视频业务提供商对视频进行优先网络资源分配和自适应速率控制的基本前提。综述了业务识别领域的一般研究方法及其对视频业务的具体应用。首先，总结了每种业务识别方法的工作原理，对比了这些方法应用于视频业务时的优缺点及在准确率和召回率指标上的识别性能;然后，特别介绍了可以提升识别准确率和计算性能的特征选择算法;最后，阐述并分析了高吞吐量网络分类速度不够、无成熟视频业务识别平台和样本分布不均衡等视频业务识别面临的挑战，并针对现有业务识别方法存在的问题，给出了引入移动边缘计算、基于端口的方法串联其他识别方法等可能的解决方案。     

面向云的视频会议系统设计与实现

随着人们生活水平的提高,人们对视频会议的要求也越来越高,无论是清晰度还是实时性都有较多要求。与视频会议相关的技术有很多,例如云计算,NGImeetings Cluster框架结构等,云计算在视频系统当中具有很大的作用,可以对系统进行测试,NGImeetings Cluster系统结合云计算的优势可以使NGImeetings Cluster服务框架更加灵活,大大提高系统的服务性能。     

Environmental Outcomes of Urban Land System Change: Comparing Riparian Design Approaches in the Phoenix Metropolitan Area

In the face of climate change and other environmental challenges, an increasing number of cities are turning to land design to enhance urban sustainability. Land system architecture (LSA)—which examines the role of size, shape, distribution, and connectivity of land units in relation to the system’s social-environmental dynamics—can be a useful perspective for examining how land contributes to the social and environmental aspects of urban sustainability. There are two gaps, however, that prevent LSA from fully contributing to urban sustainability dialogues. First, it is not well understood how urban design goals, as expressed by urban planners and other practitioners, relate to LSA and environmental outcomes. Second, most LSA work focuses on individual environmental outcomes, such as the urban heat island effect, instead of considering the broader suite of outcomes that LSA changes impact. Here, we undertake an integrated assessment of LSA impacts on surface urban heat island (based on land surface temperature), vegetation presence/health (based on NDVI), and bird biota at two riparian sites with different design intentions in the Phoenix, Arizona metropolitan area. The Rio Salado in Tempe underwent a city-led, infill redevelopment that mixed economic, recreational, and flood control design goals. The New River in Peoria experienced a more typical developer-driven urbanization. The contexts and design goals of the sites generated differences in their LSA, but only a few of these differences were sufficiently unique to contribute to divergent environmental outcomes. These differences reside in (1) the greater distribution of recreational land-covers and (2) increased surface water at the Rio Salado site compared to the New River site. Both changes are linked to land-cover patches becoming greener and cooler as well as a greater presence of waterbird and warbler species at the Rio Salado site. The distinctions between the sites provide insight for crafting design goals for redeveloping or restoring urban riparian landscapes in the Phoenix metropolitan area that are grounded in LSA. With the incorporation of additional relevant variables, especially socioeconomic ones, the research approach employed in this study provides a foundation for the assessment of other urban land system change.     

盾构施工信息化管理研究与应用

盾构施工信息化的目标是通过计算机、互联网等手段实现盾构在施工过程中数据集中管理,大数据分析,辅助管理者进行分析与决策,充分体现信息化在工程中应用价值。通过提出盾构施工信息化管理思路,对盾构机监控管理和盾构区间的视频监控管理、监控量测管理、隐患排查管理进行了研究,并进行了融合管理分析。最后,以昆明轨道交通4号线（小菜园站—火车北站区间）为背景,进行了工程应用研究。     

广西边远民族地区绿色城镇发展路径研究——以百色市为例

广西边远民族地区是集少数民族聚居区、贫困山区、矿产资源富集区、旅游资源富集区等为一体的特殊区域,由于区域的特殊性,其在绿色城镇化进程中也体现出不一样的要求。文章分析了该区域绿色城镇化的特殊性,从思想认识、绿色规划及合理规模、绿色产业、特色规划、移民、制度与政绩考核等方面出发,提出了绿色城镇发展思路。