分类学者

There are different opinions of the taxonomy on the subfamily, tribe, genus and species of Umbelliferae because the taxonomic system of Umbelliferae is based on the typical umbrella anthotaxy and its fruit with specific secretory tube.

但是由于伞形科的分类系统是建立在典型的伞形花序和带有特殊分泌管的果实的基础之上的，使得分类学者在亚科、族、属和种的设立和分类方面存在分歧，实验主要针对阿魏属和独活属的花粉形状进行研究，对阿魏属和独活属植物的分类提供一些基础数据。

There are different opinions of the taxonomy on the subfamily, tribe, genus and species of Umbelliferae because the taxonomic system of Umbelliferae is based on the typical umbrella anthotaxy and its fruit with specific secretory tube. The pollen morphology is carefully observed in this test in order to provide several basic data for the taxa of Ferula and Heracleum.

但是由于伞形科的分类系统是建立在典型的伞形花序和带有特殊分泌管的果实的基础之上的，使得分类学者在亚科、族、属和种的设立和分类方面存在分歧，实验主要针对阿魏属和独活属的花粉形状进行研究，对阿魏属和独活属植物的分类提供一些基础数据。

These Chuarids of various kinds, which are small and circular carbonaceous fossils, have attracted many attentions.

各国学者对这些小圆蕊状为主的炭质薄膜化石的生物学分类位置有不同认识。

Based on the research in the representative attacking ways ,we analyse the attacking classifications presented by Craver、Hartung、Voloshynovskiy、Boris、Cox and ect.

在对这些典型攻击方法研究的基础上，分析Craver、Hartung、Voloshynovskiy、Boris和Cox等学者的攻击分类，结合隐蔽分析等新的攻击方法，提出了一种新的数字水印攻击分类。

ID〓 is characterized by the fast speed of training and classifying, and it can be applied to large-scaled learning problems. But the selection criterion of attribute is the core of ID〓, and is now doubted. AQ〓 is a type of decision rule induction, presented by Michalski, a scientist of U. S.. It is characterized by high-precision classifying and capability of knowledge expression, and it can be applied to automatic knowledge acquisition in expert system. However, the inducing and matching speed of AQ〓 is slow.

其中决策树归纳以澳大利亚学者Quinlan的ID〓为代表，其特点是训练与分类速度都很快，适用于大规模的学习问题，但ID〓把注意力集中在属性的选择标准上，然而这种思想方法已开始受到人们的怀疑；决策规则归纳以美国学者Michalski的AQ〓为代表，其特点是分类精度高和知识表达能力强，适用于专家系统的知识自动获取，但归纳和匹配速度都慢。

Many entomologist and taxonomist have paid much attention to the studies on phylogeny and systematics of Microgastrinae since the establishment of Microgastrinae by Foerster in 1862. Much headway has been made on the phylogeny and systematics of Microgastrinae , but the dissensions from the entomologist and taxonomist on the species relationship among the genera and tribes of Microgastrinae and the appraisal on Masons classification system are being. A further large number of studies needed to be done to resolve the issue of phylogeny of Microgastrinae.

自Foerster于1862年建立小腹茧蜂亚科Microgastrinae以来，许多的昆虫学家和分类学家对小腹茧蜂亚科Microgastrinae的系统发育和分类做了大量的工作，并取得了一些成果，但是学者之间对于小腹茧蜂亚科族、属间的亲缘关系还存在很大的分歧，显然要充分解决小腹茧蜂亚科系统发育和分类问题，还需要做大量的研究工作。

In a database the concept of an example might change along with time which is known as concept drift When the concept drift the classification model built by use of old data is unsuitable for classify new data Therefore concept drift has become a hot issue in data mining in recent years Although many algorithms had been proposed to resolve this problem they can not provide users with the reason of concept drift However a user might be very interested in such rules For example doctors want to find what makes disease change; researchers want to know the reason of the variety of the weather; and decision makers would like to understand why a customer's shopping habit change In this thesis we propose a Concept Drift Rule mining Tree called CDR-Tree to solve this problem CDR-Tree can not only find the rule of concept drift also build the prediction model for both old and new data at the same time

无论在大型资料库或现实生活中，同一资料样本的概念有可能会随著时间的递移而改变，也就是产生所谓的概念漂移。当样本发生概念漂移时，由旧有资料所建构的分类模组将不再适用於预测新获得的资料，因此，近年来概念漂移已成为资料探勘中一项热门的研究议题。虽然已有？多学者提出不同的技术来解决概念漂移的问题，但是这些方法都是利用修正或重建的方式来产生适合新资料的预测模组，并无法提供造成概念漂移的原因。然而对使用者而言，其感兴趣的可能正是这些引起概念漂移的规则，如医生可能想了解引起疾病变化的主因、学者会想要知道气候转变的规则、或是决策者想找出顾客购物习惯改变的因素等。因此，本论文提出概念漂移规则探勘树( Concept Drift Rule mining Tree )，简称CDR-Tree，来解决这个问题。CDR-Tree不但能探测出造成概念漂移的主要原因，亦能同时建立新旧资料的预测模组以供决策者运用使用。

Petrologists,both at home and abroad have spent a lot of time on the classification of pyroclastic rocks, and suc_cessively put forward the classification of pyroclasts, the petrographic and the petrogenetic classification of pyroclasic rocks.

长期以来，火山碎屑岩的分类研究受到了国内外学者的重视，先后提出了火山碎屑物、火山碎屑岩岩性和火山碎屑岩成因分类。

Recent DNA evidence suggests to some plant taxonomists that the traditional way of classifying flowering plants is not correct after all, and that flowering plants need to be completely reclassified.

最新DNA证据对一些植物分类学者显示传统开花植物的分类是错误的，需要完全地重新分类。

But since its advent, scores of taxonomists have decried the shortcut, claiming it will undermine the purposely elaborate systems developed to ensure ID precision and accuracy.

但是这种分类方法的使用也遭到了许多分类学者的诋毁，他们认为这种分类方法严重破坏了现有精细的分类体系，使得分类的准确度大大降低。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。