共查询到20条相似文献，搜索用时 46 毫秒
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通过对已有的分词算法尤其是快速分词算法的分析,提出了一种新的分词词典结构,并据此提出了二次Hash^＋二分最大匹配快速分词算法。该算法具有较快的分词速度。 相似文献
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作为网络安全产品的基于隔离技术的隔离网闸越来越受人关注,隔离网闸自带的文本内容过滤大多基于关键字过滤和URL过滤,这种内容过滤在使用性能上不但过滤效果欠佳且效率差,已不能满足日益增长的网络信息的安全要求;研究了文本信息过滤的模型、文本预处理技术、文本特征选择技术、过滤算法,提出了基于统计的适合于隔离网闸的智能文本过滤的方案,并对新方案中的关键技术加以研究和实现。 相似文献
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从信息过滤系统模型功能及其实现出发,探讨了Google中PageRank技术环境下的用户偏好的分析描述与表达.在传统的过滤算法的基础上进行了改进后的过滤算法的模型构建和原形研究,结合实践进行了实验结果分析. 相似文献
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作为网络安全产品的基于隔离技术的隔离网闸越来越受人关注，隔离网闸自带的文本内容过滤大多基于关键字过滤和URL过滤．这种内容过滤在使用性能上不但过滤效果欠佳且效率差，已不能满足日益增长的网络信息的安全要求；研究了文本信息过滤的模型、文本预处理技术、文本特征选择技术、过滤算法，提出了基于统计的适合于隔离网闸的智能文本过滤的方案，并对新方案中的关键技术加以研究和实现。 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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Prof. SUN Changpu from the CAS Institute of Theoretical Physics coworkers from University of Basel in Switzerland have worked out a way - at least in theory - to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams is similar to the famous Stern-Gerlach effect whereby a beam of atoms passing through a magnetic field is split in two according to the atoms' spin states 《中国科学院院刊(英文版)》2008,22(1):23-23
Prof. SUN Changpu from the CAS Institute of Theoretical Physics and coworkers from University of Basel in Switzerland have worked out a way --at least in theory --to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams and is similar to the famous Stern-Gerlach effect, whereby a beam of atoms passing through a magnetic field is split in two according to the atoms＇ spin states （Phys. Rev. Lett. 99 130403）. 相似文献
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《中国科学院院刊(英文版)》2014,(3):212-213
<正>In February 2014,the 30th Chinese Antarctic inland expedition team reported that they have successfully conducted the seeing measurement at the Antarctic Taishan Station using a Differential Image Motion Monitor(DIMM)developed by the Nanjing Institute of Astronomical Optic and Technology(NIAOT),Chinese Academy of Sciences.In astronomy,seeing is a physical parameter that describes the irregular movement and blur of the star 相似文献
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XIN Ling 《中国科学院院刊(英文版)》2014,(4):270-271
Amassive overhaul is coming to the Chinese Academy of Sciences （CAS）. To straighten its ＂fragmented, inefficient research＂, the academy has decided to restructure its 104 institutes for better teamwork. 相似文献
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SONG Jianlan 《中国科学院院刊(英文版)》2014,(4)
<正>DNA demethylation in mammalian zygotes,a biochemical process through which the parental genomes let go the epigenetic marks from their"past lives"to obtain totipotency,has long fascinated biologists:how does it happen?A joint team at the CAS Shanghai Institutes for Biological Sciences tells a surprising story. 相似文献
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China is one of the fastest growing economies worldwide. Are science and research also in the fast lane? We talked with LUO Yuan, scientist at the Institute of Coal Chemistry in Shanxi, and Axel Mosig, Professor at Ruhr University in Bochum, who has first-hand experience working and living in China. 相似文献
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INS 《中国科学院院刊(英文版)》2014,(4):311-311
Neonatal heart:Largely,postnatal coronary vessels might not have expanded from preexisting embryonic vasculature as formerly believed–see what CAS biologists revealed in page 311. 相似文献
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《中国科学院院刊(英文版)》2014,(4):312-312
<正>Recently a group of researchers at the unit of molecular virology,Institut Pasteur of Shanghai,Chinese Academy of Sciences revealed a new mechanism to regulate the survival of influenza A virus and reported their discoveries in the Journal of Virology on July 相似文献
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《中国科学院院刊(英文版)》2014,(4):319-320
<正>Amber-bearing deposits are among the most important Konservat-Lagersttten providing unique windows into past ecosystems.Fushun amber has been known for over a century and was traditionally regarded as an important source of medicine as well as organic gemstones.The inclusions,however,were not the subject of any comprehensive investigation 相似文献