论中国英语学习者名词动用结构形成过程

针对大连某高校英语专业本科生关于名词动用这一形式进行问卷调查,验证中国英语学习者心理词汇中动化词形成方式与某一种语义范畴相结合的概率是否像英语本族语者一样受到语义范畴分布效应的影响。结果表明中国英语学习者与美国英语本族语者在使用名词动用方面有很大差别。

An improved TF-IDF approach for text classification

This paper presents a new improved term frequency/inverse document frequency (TF-IDF) approach which uses confidence, support and characteristic words to enhance the recall and precision of text classification. Synonyms defined by a lexicon are processed in the improved TF-IDF approach. We detailedly discuss and analyze the relationship among confidence, recall and precision. The experiments based on science and technology gave promising results that the new TF-IDF approach improves the precision and recall of text classification compared with the conventional TF-IDF approach.

A Study of Three Variants of Gerund Construction from the Contrastive Perspective of Social and Natural Academic Abstracts on Construction Grammar Theory

English gerund construction is a system composed of 3 variants, including "Gerund + Φ", "Gerund + of + NP", and "Gerund + NP". The noun and verb attributes of the 3 variants are recursive, and in theory their frequencies vary regularly in different styles. An abstract is placed before the beginning of an academic papers, which has the basic characteristics of conciseness and generalization, and has special requirements for the use of gerunds. The purpose of this study was to empirically explore the system of gerund construction in abstracts of natural science and social science papers, and to specifically explore the inherent characteristics of noun and verb properties of the 3 variants. For this purpose, two corpora were constructed, one is about abstracts of natural science papers, and the other is about abstracts of social science papers. Finally, the results of chi-square test showed that there was no significant difference in the frequencies of the 3 variants in the abstracts of natural science and social science papers, and the two corpora can be studied as a whole. In the combined corpus, there were significant differences in the frequencies of the 3 gerund variants. The frequencies of these 3 variants and their gerund properties showed a recursive change.

Knowledge Automatic Indexing Based on Concept Lexicon and Segm-entation Algorithm

This paper is based on two existing theories about automatic indexing of thematic knowledge concept. The prohibit-word table with position information has been designed. The improved Maximum Matching-Minimum Backtracking method has been researched. Moreover it has been studied on improved indexing algorithm and application technology based on rules and thematic concept word table.

The Modals as Pragmatic Softening Devices： Evidence From Late Modern English Grammar and Manner Books

In this research, the author considers the evidence provided by a corpus of Late Modem English grammars for our understanding of the development of the modals as politeness markers. It is possible to see how the modals and their accompanied senses are explained in an official （and often either prescriptive or proscriptive） perspective. This is another aspect which cannot be ascertained from the usage based on corpora which seem to be popular as sources of evidence in historical pragmatics. In this sense, this research brings some novel perspective to this aspect of academic study. It is possible to notice that the significations involves concept or senses which extend across a semantic--pragmatic domain which includes politeness. We can see that certain softening senses are key elements to mark polite usage. The main data used come from the descriptions of the modal auxiliary verb in a corpus of grammar books from the period. Usage and manner books are also consulted as a secondary resource. The manner book in particular is quite helpful for our understanding of how linguistic politeness was regarded at the time. Such texts also help us to find a certain network of senses which are related to polite expressions.

Research on Speech Visualization Technology and Its Application in English Listening Teaching

In order to improve the automatic retrieval ability of English vocabulary, for the distribution of semantic attributes in English vocabulary, an automatic classification method of English vocabulary is proposed based on association rules, English vocabulary data storage model is constructed, a two element linguistic feature function is constructed for describing the directionality of English lexical retrieval scheduling, English vocabulary classification decision making model is constructed based on contextual relations of English vocabulary, the features of the association rules of English vocabulary are extracted, the adaptive learning method is used to realize the automatic classification of English vocabulary. The simulation results show that the method of English vocabulary classification has good performance, the classification error rate is low, the retrieval precision is high, and the computational overhead is small.

Evaluation of recombinant endostatin in the treatment of atherosclerotic plaques and neovascularization in rabbits

Objective： Atherosclerotic plaques and neovascularization play an important role in the course of coronary atherosclerosis. This study evaluated the effect of recombinant endostatin on experimental atherosclerotic plaques and neovasculanzation in rabbits. Methods： Eighteen healthy male rabbits were divided into three groups： control group, atherosclerotic model group, and recombinant endostatin treated group. The atherosclerotic model was es- tablished via a high-cholesterol diet after balloon catheter injury. The subject weights, serum total cholesterol, creatine kinase-myocardial band fraction （CKMB）, and matrix metalloproteinase-2 （MMP-2） were measured. Six weeks after treatment, the aortic roots were taken for pathological assay. The thickness ratio of the intima to media was measured by hematoxylin and eosin （HE） staining, and the number of neovessels was measured by immunohistochemistry via monoclonal antibody CD31 staining. Results： The weight, plasma total cholesterol, and CKMB were not significantly different between the atherosclerotic model group and the recombinant endostatin treated group, but much higher than those of the control group （P〈0.05）. The thickness ratio of the intima to media in the recombinant endostatin treated group was distinctly less than that in the atherosclerotic model group （P〈0.05）. The number of neovessels decreased dramatically （P〈0.05） and the content of MMP-2 decreased slightly without statistical difference （P〉0.05） in the recombinant endostatin treated group, compared to the atherosclerotic model group. Conclusions： Recombinant en- dostatin is able to inhibit the growth of neovascularization in the atherosclerotic plaque and the development of plaque.

Efficacy and safety of drug-eluting stent implantation for the treatment of in-stent restenosis occurring within bare-metal stent and drug-eluting stent

Objective:Although drug-eluting stent(DES) implantation is the primary treatment modality for bare-metal stent(BMS) in-stent restenosis(ISR),little is known about the efficacy and safety profile of DES in the treatment of DES-ISR.The goal of this study was to compare the clinical outcomes following DES treatment for BMS-ISR and DES-ISR.Methods:Rates of major adverse cardiac events(MACE) were compared in 97 consecutive patients who underwent DES implantation for the treatment of ISR(56 BMS-ISR and 41 DES-ISR) from January 2004 to December 2008.Results:Baseline clinical and procedural characteristics were comparable,except that the DES used in the BMS-ISR group was longer and had a larger diameter.The length of follow-up was(28.60±1.96) and(20.34±1.54) months for the BMS-ISR and DES-ISR groups,respectively.One patient(1.8%) experienced non-cardiac mortality and one(1.8%) had target-vessel revascularization(TVR) in the BMS-ISR group.In the DES-ISR group,three patients(7.3%) died of sudden death with a documented acute ST-segment elevation myocardial infarction,and three suffered TVR(7.3%).Kaplan-Meier analysis indicated that cumulative survival probability and MACE-free probability were both significantly lower for the DES-ISR group(log rank test P=0.047 and P=0.005,respectively).In Cox regression analysis,DES-ISR remained an independent predictor for future MACE occurrence after adjustment for other factors(compared with BMS-ISR,risk ratio(RR)=8.743,95% confidence interval(CI) 1.54-49.54,P=0.014).Switching to a different type of DES to treat DES-ISR did not improve the prognosis.Conclusion:DES-ISR patients had a poorer prognosis than BMS-ISR patients after DES therapy.

Two-stent strategy for renal artery stenosis with bifurcation lesion

Renal artery stenosis(RAS) with a bifurcation lesion is a challenge for interventional therapy.The aim of this study is to summarize our experience in RAS with a bifurcation lesion.Five patients with RAS involving bifurcation lesion are described.In cases 1 to 3,a single-stent strategy was first adopted.However,these three patients were converted to a two-stent strategy for bailout stent implantation in the side branches.In cases 4 and 5,a simultaneous kissing stent technique was performed.Angiography showed that the reference vascular diameter of the main branch was much larger than those of the side branches.Although obvious residual stenosis existed in cases 1 to 3 after stent implantation,no obvious residual stenosis was seen in cases 4 and 5.Renal artery duplex sonography was performed in cases 1 through 5 at 6,7,7,8,and 6 months,respectively,after the procedures.No evidence of restenosis or occlusion was seen.In conclusion,stent implantation with the simultaneous kissing stent technique may result in more simple and more satisfactory immediate angiographic results.