大面阵CCD航测相机图像去黑斑的处理

在大面阵数字航测相机的使用过程中,存在影像光照不均匀的问题.由于硬件设计很难达到预想的效果,在光照过于强烈的情况下,还会产生CCD过饱和的现象,通过增加遮光片可以解决这一问题,但全色波段的影像会产生黑斑.而通过马斯克匀光的方法去除中心的黑斑,提高影像的质量.并且将图像中心的反差增大,加大对比度,增大图像灰度的动态范围.     

On computer generation of gamma random variables by rejection and composition procedures 2

The paper presents various algorithms for generating gamma random variables, by combining rejection and composition procedures. Two efficient algorithms are given for the case when the parameter of the gamma distribution is 0<v<l. For the case vl, several algorithms are given but they (except one), work reliably only for small values of v. Results of some computer tests together with FORTRAN subroutines are also presented.     

汉晋时期的数字化标榜与取士制度

汉晋时期,名士相互之间兴起一种数字化标榜之风。此风由东汉时开始,最先表现在"郡国之书",随着世家大族及其文化的形成,又渐渐朝谱牒或家谱的方向转移。在九品中正制度关于人才选拔方面的弊端逐渐明显化之后,乡党清议和"郡国之书"失去了择士的现实功能,名士间依然盛行此风,但往往更多地称述于"志好"相同或"同志"间的士人集团。     

网络环境下数字化产品适用的营销模型研究

互联网和电子商务的广泛应用与开展,为数字产品营销提供了巨大的市场空间.同时,数字产品独特的交易过程也使其营销过程不同与传统产品.本文探讨三种经典的营销模型4P、4C和4S应用到数字产品的营销时的适用性.在已有研究总结出的四条命题基础上,通过三种渠道收集了45个数字产品营销工具作为样本,采用分类方法将三种经典的营销模型作为分类框架,对样本进行分类比较研究,验证了提出的五条假设并发现了三条有意义的结论:其一,数字产品的可试性和其需要的营销工具数量显著相关;其二,三种营销模型对不同种类的数字产品存在适用性的差异;其三,在网络营销环境中,数字产品常用的传输模式(下载和交互)与其适宜的分销方式(网上商店和独立网站)之间存在因果关系.     

Digital natives and social media

Digital natives (also known as “Generation Y” and “Millennials”), a generation born during of after introduction of digital technologies, 1980s and after, have mixed preferences for media use in personal and professional lives. A study by Friedl and Tkalac Ver?i? (2011) showed that even though digital natives prefer digital media in their personal lives, this is not necessarily reflected in their business lives. This study addressing preferences of “traditional” vs. “the new media” in a university setting found an opposite result.     

高校图书馆数字化参考咨询服务的思考

论述了数字化参考咨询服务的概念和类型 ,并在列举了国内外几个典型的数字化参考咨询实例的基础上 ,提出了目前高校图书馆数字化参考咨询服务系统构建应具备的功能模块和服务发展方向。     

“Whatsapping” the continuity of postpartum care in Switzerland: A socio-anthropological study

BackgroundDigital media such as Apps, Internet and social networks have become integral parts of the maternity experience for more than a decade. These media can support or undermine women’s experiences as has been shown in digital sociology research. Using Immediate Messaging Applications to provide information and support to women during the perinatal period is an emerging practice.AimThis article analyses how health and social care professionals – with a focus on community midwives – and women communicate between postpartum home visits through Immediate Message Applications in Switzerland.MethodsA socio-anthropological study that relied on qualitative methods including semi-directed interviews with midwives and health and social care professionals (n = 30) and immigrant women (n = 20).FindingsSince the introduction of Immediate Messaging Applications, women and their carer converse more regularly between post-partum home visits. Women send questions, pictures and videos to them, often allowing swift responses to their concerns. Midwives encounter difficulties answering women’s questions when they cannot be solved through quick communication (e.g. infant crying). To them, texting frequency forms a clinical clue to women’s mental health. Not all women contact their carer through digital messages; immigrant women are less likely to know and use this service.Discussion and conclusionImmediate Messaging Applications form a promising communication tool, complementary to home visits, and contribute to woman-centered care and continuity of care. As an emergent practice, it has not been framed by a guideline yet. Policy makers and practitioners should ensure that its use does not contribute to unequal access to care.     

关于数字图书馆发展的思考

数字图书馆是国家信息基础设施的重要组成部分,目前已成为评价一个国家信息基础设施水平的重要标志,也是世界各国图书馆正在竟相研究和发展的重大课题。如何探讨和研究数字图书馆的概念、特征、发展阶段及现状,是分析数字图书馆发展所面临问题及建议采取相应对策的关键。     

基于DS12C887的实时日历时钟的设计

本系统采用单片机作为数字钟的核心控制器,读取时钟芯片的值,并通过显示器显示出来,而且可以通过按键电路给单片机执行信号,给时钟芯片赋初值。采用STC89C51作为主控单片机,时钟模块选用DS12C887作为时钟芯片,显示模块选用LCD1602,设置部分选用按键电路。其功能是在51单片机系统中设置、获取、记录实时的日历时钟信息并通过数码管显示,选用日历时钟芯片DS12C887作为实时时钟芯片,为系统提供详细的时间信息,次款芯片内部有锂电池,可以带掉电的情况下保存10年以上。     

广西高校学报数字化出版平台建设探析

数字化出版发展迅速,但广西高校学报在数字化出版方面比较落后,仅仅是实现办公自动化、电脑排版,借助商业数据库把电子出版在网上传播。广西高校学报在运作数字化出版面临较多的困难。要取得数字化出版的发展,必须采取有效的措施。从广西高校学报的实际出发,可从以下方面着手：（一）组建数字化出版联合体;（二）分阶段建设。