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An efficient trans‐PdCl2(NH2CH2COOH)2‐catalyzed direct C3‐cyanation of indole C─H bonds is described. Notably, free (N─H)‐indoles reacted smoothly using the procedure, and the desired product 3‐cyanoindoles were obtained in good to excellent yields.
The recognition of Laos organization name is a difficult problem in the entity recognition of Laos language. This paper presents a algorithm of Laos organization name recognition model based on cascaded conditional random fields. The algorithm solved the recognition of easy entity such as person name and location name in the lower model of conditional random fields(CRFs) and served the recognition...
According to characteristics of Lao named entities, the paper proposes an approach of Lao Named Entity Recognition (NER) based on Conditional Random Fields (CRFs) with knowledge information. Firstly, we segment the text into word sequence and design three labels BIO1 for personal name and location name entity recognition. Secondly, some named entity features of Lao Language are selected for Conditional...
This paper presents a Naxi dependency parsing method which combined rules and statistics, based on the characteristic of the Naxi language. Firstly, the annotation standard of Naxi Dependency Treebank was established and dependencies were defined which are based on the syntactic structure characteristics of Naxi language, then Naxi Dependency Treebank was constructed; Secondly, the constructed Naxi...
In this paper, we study the characteristics of vertical search engine. We design and realize a digital products vertical search engine system by improving Heritrix crawler and open source search engine Lucene framework. Based on this search system, digital products search for Android client is integrated into the content of this research by formulating and implementing the data exchange standards...
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