基于蚁群优化算法的传感器网络能量有效性覆盖机制     

黄如  朱杰  徐光辉 《东南大学学报》2007,23(2):255-260

提出了一种解决无线传感器网络覆盖问题的能量有效性启发式机制.该机制在节能的前提下,实现了对目标监控区域的完全覆盖,且覆盖精度与目标的重要性级别成正比关系.机制的实现运用了蚁群优化算法,算法的设计过程采用了新颖的启发式因子构造方法和基于评价函数的全局信息素更新规则,由此,人工蚂蚁被赋予了对目标监控区域的覆盖状况和对传感器网络区域能量状况的自适应感知能力,并通过增加优化解集中节点上的信息素量,加速求取最优解的收敛过程.最后,蚁群在迭代优化的基础上构建出解决无线传感器网络覆盖问题的健壮优化解,该优化解能够在能量有效性的基础上具备良好的覆盖有效性和较长的生命周期.  相似文献   

绿色设计贡献率函数及其实证分析          下载免费PDF全文

王光辉  王红兵 《中国科学院院刊》2016,31(5):508-516

绿色设计是启动绿色发展的第一杠杆,区域绿色发展在设计层面的研究离不开绿色设计的定量分析。传统的绿色设计研究更多强调设计在环境友好型和资源节约型产品层面的表现,尚未对区域层面的绿色设计理论进行定量分析和研究。为全面反映中国各地区绿色设计的真实水平,文章借鉴已有的成熟理论和方法,提出绿色设计本底度、推进度和覆盖度指数,并由此构建"绿色设计贡献率函数",以期更深层次地表征各地区绿色设计的基础水平、发展潜力和选择策略等。  相似文献   

Yahoo!的网络信息覆盖率研究     

段宇锋  刘璇 《情报科学》2010,(1)

测定了Yahoo!对中国和OECD确定的24个发达国家网络信息的覆盖率。结果显示,Yahoo!对不同国家网络信息的覆盖率存在差异,对中国网络信息的覆盖率是60.24%,而上述25个国家的平均值是71.197%。这表明我国相关部门应从微观和宏观两个层面制订针对主要搜索引擎的优化策略,以提升中国网络信息的影响力和价值。  相似文献   

Altmetrics覆盖率影响因素及应用分析     

刘晓娟  余梦霞 《图书情报工作》2018,62(16):92-101

[目的/意义]探讨影响altmetrics覆盖率的因素,为altmetrics在学术评价中的合理使用奠定基础。[方法/过程]基于Web of Science、Altmetric.com以及Mendeley,以5个学科1996-2015年间发表的所有期刊论文为分析对象,探讨学科领域、出版年份、来源期刊、国别、语种5个因素对altmetrics覆盖率的影响。[结果/结论]不同altmetrics指标的覆盖率不同,Mendeley覆盖率最高,Twitter其次,而大多数指标覆盖率很低;在将altmetrics应用于期刊评价时,有必要合理鉴别和排除期刊推广策略导致的高覆盖率现象;以上5个因素均会导致期刊论文的altmetrics覆盖率差异,因此在应用altmetrics时,需要考虑到被评价对象的属性特征,必要时考虑altmetrics在这些影响因素上的标准化。  相似文献   

体育新闻报道形态变迁：理解新中国体育发展历程的一个向度     

施海泉 《广州广播电视大学学报》2009,9(1):77-80

建国近60年来,体育新闻报道既是新中国体育事业发展的亲历者和见证者,也是其参与者和建构者。本文通过对体育新闻报道在新中国体育发展进程中的表现及作用的分析,说明体育新闻报道形态的变迁研究是认识和理解建国以来体育事业发展史的一条有效途径。  相似文献   

The role of British newspapers in framing the public perception and experience of European radio 1930 to 1939     

Paul Rixon 《Media History》2020,26(2):153-166

This article analyses how British newspapers in the 1930s created a particular frame or view of radio as an international medium. This frame was created around the idea of a duality, of radio being defined by both national and foreign broadcasts. By analysing coverage provided by the main national newspapers at this time, in relation to their specific radio coverage, such as programme listing and highlights, this paper delineates the form the frame took, what was included and was absent. Such a frame provides an understanding of how the newspapers viewed and valued radio in a period when international broadcasts were seen as an important part of what radio could offer.  相似文献   

浅析CDMA高层越区覆盖现象发现及解决方法     

吴振辉 《韩山师范学院学报》2010,31(3):61-65

CDMA2000系统是一个自干扰系统,网络分布为微蜂窝结构,每个基站小区都有相对确定的覆盖范围,为了避免重叠覆盖所增加的小区内部干扰,降低系统容量,必须减少信号重叠情况.CDMA网络特性不允许信号发生越区覆盖,若越区覆盖则产生很大的危害.笔者揭示越区覆盖对网络的危害,浅析如何发现建筑物高层越区覆盖现象及其解决方法.  相似文献   

财经新闻报道的翻译原则及策略     

孔维晟  赵江宁 《安徽师范大学学报(人文社会科学版)》2010,38(2):237-240

结合财经新闻报道的语用特点,从目的论的角度提出财经新闻报道的翻译必须具有三性:及时性、准确性和专业性,指出只有丰富的财经知识配合灵活的翻译策略,才能准确传达信息的新闻文体功能.  相似文献   

News values of sports events: an application of a newsworthiness model on the World Cup coverage of US and Korean media     

Jong Hyuk Lee 《亚洲交流杂志》2013,23(3):302-318

This study examined whether news value indicators influenced sports coverage of the 2002 World Cup soccer games by using a newsworthiness model. The model hypothesized that the more significant and the more deviant an event is, the more prominently the event is covered by the media. Significance and deviance of each match in the World Cup games are operationally defined by using world rankings such as FIFA points, William Hill betting points, and CNN power rankings. Prominence of media coverage for each match was measured as the dependent variable in four different contexts: US traditional media, US online media, Korean traditional media, and Korean online media. The results of our study show that the newsworthiness model is partially effective in predicting media coverage of sports events. Traditional media coverage is better explained by the newsworthiness model than online media coverage.  相似文献   

The Invisible Woman?     

《Journalism Practice》2013,7(5):651-668

While the coverage of women's sport in UK media rises to comparable levels to men's sports during large sporting events like the Olympics, academics agree that “routine” women's sports coverage is under-represented. According to the Women's Sport and Fitness Foundation, “81% of people think that the female athletes at London 2012 make better role models for young girls than other celebrities.” This article examines the representation of women in sport and compares routine coverage of women's sports in the UK national press across a week in February 2012, six months before the London Olympics, with coverage in a week in February 2013, six months after the Olympics, to see if there has been an Olympic “legacy” that increased coverage. It also examines coverage at the same time of year a decade earlier, to see how far, if at all, women's sports coverage in newspapers has progressed. The results suggest that there has been minimal change in everyday coverage of women's sports after the Olympics, and that female athletes continue to be hugely under-represented in the UK press.  相似文献