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随着公众移动通信的快速发展,伪基站的泛滥不仅破坏正常电信秩序,危害公共安全,而且严重损害群众财产权益,侵犯公民个人隐私,已成为社会一大公害。如何从垃圾短信大数据中挖掘出伪基站活动的时空规律,寻找有效的防控方案,从源头上进行打击和治理成为管理部门和研究者共同关注的焦点。本文基于北京市垃圾短信数据,利用非负矩阵分解的方法分析伪基站的时空分布规律;并利用TF-IDF构建垃圾短信分类模型,对垃圾短信进行分类,结合土地利用数据,分析伪基站在发送不同类型垃圾短信时的时空分布规律。结果显示：北京市垃圾短信多分布于路网和中心城区;白天垃圾短信数量远远多于晚上;垃圾短信的分布随时间的推移沿着路网逐渐向内收缩;发送不同类型垃圾短信的伪基站的时空分布具有一定的差异;通过非负矩阵分解得到的结果,与垃圾短信分类后得到的结果有很好的匹配。研究表明,非负矩阵分解具有实现上的简便性、分解形式和分解结果上的可解释性等优点,可以有针对性的为有关部门建言打击伪基站的有效方案,对于伪基站违法行为的治理具有一定的意义。 相似文献
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区域地球化学异常信息提取方法研讨 总被引：8，自引：0，他引：8
在一些以成矿区带或省区为单位的区域性地球化学异常信息提取工作中,所圈定的异常经常会出现“有矿没异常或有异常没矿”的信息错位现象．给地球化学评价工作造成一定的困难。本文借助实际资料,分析了造成这种现象的主要原因,并通过对几种解决这些问题的方法技术介绍对比,提出滑动平均标准化数值法,详细介绍了滑动平均标准化数值法的方法基础、优点、具体做法以及应用效果。 相似文献
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根据沿海地区气象台站预报服务的需求,对MICAPS系统的资料处理功能进行修改扩充,实现对气旋加密观测报的有效快速处理,满足业务服务需要。 相似文献
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气象短信业务在“一起玩吧”模式下的运营 总被引：2，自引：2，他引：0
对移动一起玩吧网络平台以及该平台运营的气象短信业务进行介绍,总结2007年一起玩吧模式下气象短信业务的推广方式以及带来的效益,引出一起玩吧气象短信用户到期面临的挽留问题以及解决办法.最后对未来一起玩吧模式下气象短信业务的发展方向进行展望,提出新业务构思. 相似文献
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This paper investigates trust in the scientists, government authorities and wider risk management team during the ongoing
volcanic crisis in Montserrat, WI. Identifying the most trusted communicator and how trust in information can be enhanced
are considered important for improving the efficacy of volcanic risk communication. Qualitative interviews, participant observations
and a quantitative survey were utilised to investigate the views and attitudes of the public, authorities and scientists.
Trust was found to be dynamic, influenced by political factors made more complex by the colonial nature of Montserrat’s governance
and the changing level of volcanic activity. The scientists were viewed by the authorities as a highly trusted expert source
of volcanic information. Mistrust among some of the local authorities towards the scientists and British Governor was founded
in the uncertainty of the volcanic situation and influenced by differences in levels of acceptable risk and suspicions about
integrity (e.g. as a consequence of employment by the British Government). The public viewed friends and relatives as the
most trusted source for volcanic information. High trust in this source allowed competing messages to reinforce beliefs of
lower risk than were officially being described. The scientists were the second most trusted group by the public and considered
significantly more competent, reliable, caring, fair and open than the authorities. The world press was the least trusted,
preceded closely by the British Governor’s Office and Montserratian Government officials. These results tally well with other
empirical findings suggesting that government ministers and departments are typically distrusted as sources of risk-related
information. These findings have implications for risk communication on Montserrat and other volcanic crises. The importance
and potential effectiveness of scientists as communicators, because of, and despite, the existence of political, cultural
and institutional barriers, is exemplified by this study.
相似文献
| Katharine HaynesEmail: Email: |
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短消息,俗称短信,已经成为现代人交流的常用手段之一。但是在实际使用中,存在着诸如手机屏幕小,影响短信的阅读以及手机键盘小,影响短信的输入等问题。针对这些问题,本文设计并开发了基于C#语言和SQL数据库的校园短信信息系统。该系统经过需求分析和数据库设计,在建立的用户表和短信表的基础上,编程实现了功能设计中的登录验证功能、简单查询功能、复合查询功能和发送短信功能,并在某大学里进行了实际的使用。 相似文献
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震情信息发布平台的研制与应用 总被引：1，自引：1，他引：0
基于Android系统开发震情信息发布平台,实现实时获取中国地震局EQIM速报信息、实时获取安徽台网编目信息、拦截指定号码短信等功能,并调用百度在线地图显示震中地理信息,利用手机内置GPS或者电信运营商基站计算震中距离手机持有者的距离. 相似文献