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企业信用风险评价是金融领域最重要的问题之一。提出一种将模糊聚类（FC）和变精度粗糙集理论（VPRS）结合进行信用风险评价的模型。首先利用模糊聚类法对样本上市公司数据进行离散化处理,然后根据变精度粗糙集理论抽取决策规则。结果表明,由该方法生成的决策规则能对样本数据进行正确的分类,并具有一定的抗干扰性。 相似文献
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研究提高翻译算法的翻译准确性问题。由于英语名词短语语法复杂、规则多,导致传统机器翻译算法存在效率低、准确率不高难题。为提高英语名词短语识别准确率,提出一种粗糙集的名词短语识别方法。粗糙集方法把英语名词短语识别当成一个决策问题,通过粗糙集理论对特征约简和规则优化,最后对其进行进识别。采用粗糙集方法对WSJ英语名词短语样本进行仿真实验,仿真结果表明,粗糙集的名词短语识别正确率高于其它翻译方法,是一种有效英语名词短语机器识别方法。为实际设计提供依据。 相似文献
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本文介绍了粗糙集的基本理论,及基于粗糙集的知识获取理论模型,并运用这一模型对企业人才引进案例进行分析,通过决策表约简,剔除冗余属性、消除过剩规则,最后得出了属性约简的最小化结果以及决策规则。 相似文献
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《科技通报》2015,(9)
在对数学分类模型进行分析的过程中,容易出现分类规则含义不明确,形式复杂等问题,导致传统的数学分类模型,由于采用学习算法对模型参数进行调整,无法有效实现数学分类,提出一种基于改进模糊粗糙集的数学分类模型,在模糊信息观下对模糊粗糙集进行分析。将互信息引入模糊粗糙集的分析中,对模糊决策表中模糊属性的相对重要性进行度量。通过bottom-up形式对相对约简进行计算。将空集作为初始点,依据属性重要性,逐次获取重要属性将其添加至集合中,直至达到终止条件。通过DTRS对数据集进行属性约简,将约简结果当成模型的输入变量。对数学分类模型的输入变量进行离散化处理。对决策表中的重复样本及通过冗余条件获取的决策表进行删除,获取决策规则。通过设定阈值对置信度较低的模糊规则进行过滤,删除因噪声样本形成的错误规则。仿真实验结果表明,所提方法具有很高的分类精度。 相似文献
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针对八侵检测规则提取困难的现状,提出了基于粗糙集遗传算法的入侵规则挖掘算法.该算法利用粗糙集对数据的精简优势,以及遗传算法的高效并行特性,可以从系统的审计数据中提取出有效的规则.通过KDDCUP99入侵检测数据测试,证明算法的有效性和可行性. 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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Joachim Trümper 《中国科学院院刊(英文版)》2014,(2):201-201
<正>"In 1979 two Chinese scientists joined our institute in the framework of the historical CAS-MPG agreement.This marked the beginning of a longstanding fruitful collaboration.Many visitors followed and contributed to our scientific programs.–My first visit to China took place in 1981–with stays at CAS institutes in Bejing,Nanjing,Shanghai and Kunming,where I received unforgettable impressions of 相似文献
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《中国科学院院刊(英文版)》2014,(3)
<正>May 15,2014Publicly funded scientific research is an important means for the society to create knowledge,support innovation,and promote growth.Research articles from such research are knowledge resources to be shared by all.Their open access will facilitate the dissemination and utilization of knowledge,turn the knowledge produced by public investment effectively into innovation and development capabilities of the society,ensure that public knowledge benefi ts all,and strengthen the innovation driven development strategy.Therefore,Chinese Academy of Sciences(CAS)issues at the present stage the following open access policy for articles from publicly funded scientifi c research projects:CAS requires its researchers and graduate students to 相似文献
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《中国科学院院刊(英文版)》2014,(3)
<正>Between February and March of 2013,the source of avian-origin H7N9 human infection was discovered in Shanghai and Anhui,China.Prior to this,H7N9 has only exhibited characteristics of a low pathogenic avian infl uenza virus,carried by chickens with no known cross-species transmission.By the end of August 2013,Chinese mainland reported a total of 134 confi rmed cases of H7N9 human infections across12 provinces and 42 cities,resulting in 45 deaths.In October and November,Zhejiang Province found three new cases and Guangdong found one case of human infection,suggesting the possibility of a comeback in the fall and winter seasons.Researchers led by Prof.GAO Fu(George Fu Gao)at the Institute of Microbiology,CAS and Beijing Institutes of Life Science,have made progress on understanding 相似文献