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Negation scope detection with a conditional random field model

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High Technology Letters 2017年第2期23卷 191-197页

作者： Lydia Lazib Zhao Yanyan Qin Bing liu ting Research Center for Social Computing and Information Retrieval Harbin Institute of Technology Harbin 150001 P. R. China

Identifying negation cues and their scope in a text is an important subtask of information extraction that can benefit other natural language processing tasks,including but not limited to medical data mining,relation extraction,question answering and sentiment *** tasks of negation cue and negation scope detection can be treated as sequence labelling *** this paper,a system is presented having two components:negation cue detection and negation scope *** the first phase,a conditional random field(CRF) model is trained to detect the negation cues using a lexicon of negation words and some lexical and contextual ***,another CRF model is trained to detect the scope of each negation cue identified in the first phase,using basic lexical and contextual *** two models are trained and tested using the dataset distributed within the* Sem Shared Task 2012 on resolving the scope and focus of *** results show that the system outperformed all the systems submitted to this shared task.

关键词： negation detection negation cue detection negation scope detection natural language processing

Selective photo-reduction of nitrate to nitrogen with a two-step process by a KBH_(4)/Cu(II)modified CuFe_(2)O_(4)photocatalyst

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Nano Research 2023年第7期16卷 10462-10475页

作者： Li Cai Jinrui Guo ting liu Jing Tian Zhaoli Wang Yong liu Mohamed SHamdy Xuping Sun College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610066China Chengdu Academy of Environmental Sciences Chengdu 610072China Key Laboratory of Treatment for Special Wastewater of Sichuan Province Higher Education System Chengdu 610066China Catalysis Research Group(CRG) Department of ChemistryCollege of ScienceKing Khalid UniversityP.O.Box 9004Abha 61413Saudi Arabia Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

Nitrate(NO_(3)^(-))removal by photochemical-reduction has received extensive ***,the low selectivity of NO_(3)^(-)reduction to N_(2)hinders the application of this *** this study,a novel Cu@Fe-Cu-CuFe_(2)O_(4)-x photocatalyst was prepared by modifying CuFe_(2)O_(4)with KBH4 and Cu(II),and used to selectively reduce NO_(3)^(-)to N_(2)with a two-step reduction *** step(1),with Cu@Fe-Cu-CuFe_(2)O_(4)-x/ultraviolet(UV)system,91.0%NO_(3)^(-)was reduced to 52.3%NO_(2)-and 39.4%N_(2)within 60 *** rapid removal of NO_(3)^(-)was due to the synergistic effect of oxygen vacancies,Fe-Cu corrosion cell,and CuFe_(2)O_(4)*** step(2),H_(2)C_(2)O_(4)and H_(2)O_(2)were introduced into the effluent of step(1)to promote CO_(2)·-formation via Fe(II)and Fe(III)catalysis and UV radiation,which boosted the selective reduction of NO_(2)-to N_(2).When H_(2)C_(2)O_(4)and H_(2)O_(2)dosages were both 4.0 mmol·L^(-1)and the reaction time was 30 min,the removal efficiency of NO_(2)-achieved 100%and the selectivity of N_(2)was 83.0%.Overall,the two-step reduction process achieved 95.0%NO_(3)^(-)removal efficiency and 90.1%N_(2)selectivity with initial NO_(3)^(-)concentration of 30 mg·N·L^(-1).In addition,the denitrification mechanism of the two-step reduction process was tentatively proposed.

关键词： nitrate nitrite photochemical-reduction denitrification photocatalysis

The Effects of Input Enhancement and Output Task on Promoting Relative Clauses in Writing

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The Effects of Input Enhancement and Output Task on Promotin...

作者： liu ting 西安外国语大学

学位级别：硕士

本实验选取英文关系从句作为目标语言形式，根据PDH假设将其按难度层级进行分类，试图研究强化型语言输入和输出这两种任务在促进不同难度关系从句的习得中所起的作用。作者在实验中提出了以下三个问题： 1）强化型输入任务能否促进中... 详细信息

本实验选取英文关系从句作为目标语言形式，根据PDH假设将其按难度层级进行分类，试图研究强化型语言输入和输出这两种任务在促进不同难度关系从句的习得中所起的作用。作者在实验中提出了以下三个问题： 1）强化型输入任务能否促进中国学生在英文写作中使用关系从句？（包括一般关系从句，难度较高的SS/SO型关系从句和难度较低的OO/OS型关系从句） 2）输出任务能否促进中国学生在英文写作中使用关系从句？（包括一般关系从句，难度较高的SS/SO型关系从句和难度较低的OO/OS型关系从句） 3）强化型输入任务和输出任务在促进中国学生英文关系从句使用中谁的效果更明显？（包括一般关系从句，难度较高的SS/SO型关系从句和难度较低的OO/OS型关系从句）本实验数据使用SPSS（15.0）软件进行分析，得出以下结论：强化型输入任务和输出任务对难度不同的关系从句产生的促进作用不同。 1）强化型输入能促进一般关系从句的习得。它在促进难度较低的OO/OS型从句方面效果较好，但在促进难度较高的关系从句（SS/SO型）方面效果欠佳。 2）输出任务能促进关系从句的的习得，其中既包括难度较高的关系从句（SS/SO），又包括难度较低的关系从句（OO/OS），但其效果缺乏持久性。 3）与强化型输入任务相比，输出型任务在促进难度较高的关系从句（SS/SO）的习得方面的效果更好一些。但就促进难度较低的关系从句（OO/OS）而言，两种任务没有本质差别。

关键词：强化型输入输出注意假设关系从句二语习得感知难度假设

Efficacy and safety of benralizumab in patients with eosinophilic asthma： a meta-analysis of randomized placebo-controlled trials

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Frontiers of Medicine 2018年第3期12卷 340-349页

作者： ting liu Faping Wang Geng Wang Hui Mao Department of Respiratory Medicine West China Hospital Sichuan University Chengdu 610041 China

Benralizumab is a monoclonal antibody that targets interleukin-5 receptor α to deplete blood eosinophils and improve the clinical outcomes of allergic asthma. We conducted a meta-analysis to evaluate the safety and efficacy of different doses of benralizumab in patients with eosinophilic asthma. All randomized controlled trials involving benralizumab treatment for patients with eosinophilic asthma, which were searched in PubMed, Embase, and the Cochrane Library published until January 2017, as well as the rate of asthmatic exacerbation, pulmonary functionality, asthma control, quality of life scores, and adverse events were included. Randomized-effect models were used in the meta-analysis to calculate the pooled mean difference, relative risks, and 95% confidence intervals. Five studies involving 1951 patients were identified. Compared with the placebo, benralizumab treatment demonstrated significant improvements in the forced expiratory volume in 1 s （FEV1）, Asthma Quality of Life Questionnaire scores, decreased asthmatic exacerbation and Asthma Control Questionnaire-6 （ACQ-6） scores. Benralizumab treatment was also not associated with increased adverse events. These findings indicated that benralizumab can be safely used to improve FEV1, enhance patient symptom control and quality of life, and reduce the risk of exacerbations and ACQ-6 scores in patients with eosinophilic asthma. Furthermore, our meta-analysis showed that benralizumab with 30 mg （every eight weeks） dosage can improve the health-related quality of life and appear to be more effective than 30 mg （every four weeks） dosage. Overall, data indicated that the optimal dosing regimen for benralizumab was possibly 30 mg （every eight weeks）.

关键词： benralizumab anti-interleukin-5 monoclonal antibody eosinophilic asthma meta-analysis

Molecular Simulation and Catalytic Active Sites Identification of Dammarenediol-Ⅱ Synthase

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Journal of Beijing Institute of Technology 2017年第4期26卷 563-570页

作者： ting liu Xiangmei Zhang Fanglong Zhao Wenyu Lu School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Key Laboratory of System Bioengineering Ministry of Education Tianjin University Tianjin 300072 China SynBio Research Platform Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 China

Squalene and oxidosqualene cyclizations are regarded as the most complex chemical reactions in the nature,which can achieve protonation,deprotonation,a sequence of hydride and methyl migration. Dammarenediol-Ⅱ synthase（ DS）,as a kind of 2,3-oxidosqualene-triterpene cyclase,catalyses2,3-oxidosqualene to form dammarenediol-Ⅱ. To assess the three-dimensional（ 3 D） structure and catalytic active sites of dammarenediol-Ⅱ synthase,utilizing the homology modeling method,3 D models of DS were established in the Modeller9 v14 software and I-TASSER server. With the highest sequence identity with DS,human oxidosqualene cyclase 3 D models（ PDB： 1 W6K and 1 W6J） were chosen as templates. Through further evaluation and optimization,an optimal DS model was obtained consequently. Then several putative catalytic active sites were found through the molecular docking simulation between DS model and product dammarenediol-Ⅱ by using Autodock 4. 2. Finally,site-directed mutants of DS were expressed in Saccharomyces cerevisiae,a significant decrease of the yield of dammarenediol-Ⅱ is achieved,which verified the significance of these putative active sites.

关键词： dammarenediol-Ⅱ synthase homology modeling molecular docking active sites mutation

Gated recurrent unit model for a sequence tagging problem

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High Technology Letters 2019年第1期25卷 81-87页

作者： Rekia Kadari Zhang Yu Zhang Weinan liu ting Research Center for Social Computing and Information Retrieval Harbin Institute of Technology

Combinatory categorial grammer(CCG) supertagging is an important subtask that takes place before full parsing and can benefit many natural language processing(NLP) tasks like question answering and machine translation. CCG supertagging can be regarded as a sequence labeling problem that remains a challenging problem where each word is assigned to a CCG lexical category and the number of the probably associated CCG supertags to each word is large. To address this, recently recurrent neural networks(RNNs), as extremely powerful sequential models, have been proposed for CCG supertagging and achieved good performances. In this paper, a variant of recurrent networks is proposed whose design makes it much easier to train and memorize information for long range dependencies based on gated recurrent units(GRUs), which have been recently introduced on some but not all tasks. Results of the experiments revealed the effectiveness of the proposed method on the CCGBank datasets and show that the model has comparable accuracy with the previously proposed models for CCG supertagging.

关键词： combinatory categorial grammer (CCG) CCG supertagging deep learning gated recurrent unit (GRU)

Nondestructive detection of infertile hatching eggs based on spectral and imaging information

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International Journal of Agricultural and Biological Engineering 2015年第4期8卷 69-76页

作者： Zhu Zhihui liu ting Xie Dejun Wang Qiaohua Ma Meihu College of Engineering Huazhong Agricultural UniversityWuhan 430070China National R&D Center for Egg Processing College of Food Science and TechnologyHuazhong Agricultural UniversityWuhan 430070China

In order to quickly distinguish infertile eggs from fertile eggs,the hyperspectral imaging technology consisting of imaging and spectral information was used for detecting the fertile information of *** hatching eggs were incubated,a hyperspectral imaging system(wavelength between 400 to 1000 nm)was used to acquire the images one-by-one *** characteristic information of ratios of length to short axis,elongation,roundness and the ratios of the yolk area to the whole area was extracted based on the *** normalization method was used as the spectral data preprocessing,and then 155 spectral characteristic variables were extracted from 520 nm waveband through the correlation coefficient *** component analysis(PCA)method was adopted to reduce the dimensions of image-spectrum fusion information;the top six principal components were *** vector machine(SVM)method was used to establish classification of fertile and infertile eggs models,which are based on image,spectrum and image-spectrum fusion information *** accuracy rates of the SVM models were 84.00%,90.00%and 93.00%*** experimental results show that the model based on image-spectrum fusion information technology is superior to the single information *** transmission imaging technology is effective and feasible to detect the fertile hatching eggs before incubation.

关键词： hyperspectral image hatching eggs information fusion nondestructive detection

Observation of holographic focusing effects in a carbazole photorefractive film without a bias field

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Chinese Science Bulletin 2008年第23期53卷 3773-3776页

作者： FAN ting ZHANG Yang liu JinSong CHEN YaKe liu ShiXiong Wuhan National Laboratory for Optoelectronics School of Optoelectronic Science and Engineering Huazhong University of Scienceand Technology Wuhan 430074 China

The holographic focusing effects of light in a carbazole photorefractive film at 632.8 nm wavelength were observed without applying a bias field, owing to the two-beam coupling process in the material. The material wa... 详细信息

关键词：全息聚焦效应光控继电器光学应用光学薄膜

Flat-head power-law, size-independent clustering, and scaling of coevolutionary scale-free networks

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Frontiers of physics 2011年第3期6卷 337-341页

作者： Chen-ping ZHU Xiao-ting liu Zhi-ming GU College of Science Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Research Center for Complex System Science Shanghai University for Science and Technology Shanghai 200093 China

Scale-free topology and high clustering coexist in some real networks, and keep invariant for growing sizes of the systems. Previous models could hardly give out size-independent clustering with self- organized mechanism when succeeded in producing power-law degree distributions. Always ignored, some empirical statistic results display flat-head power-law behaviors. We modify our recent coevo- lutionary model to explain such phenomena with the inert property of nodes to retain small portion of unfavorable links in self-organized rewiring process. Flat-head power-law and size-independent clustering are induced as the new characteristics by this modification. In addition, a new scaling relation is found as the result of interplay between node state growth and adaptive variation of connections.

关键词： scale-free network flat-head power-law size-independent clustering scaling relation,coevolution