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Data alignment for text-independent voice conversion

Data alignment for text-independent voice conversion

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第十届全国人机语音通讯学术会议暨国际语音语言处理研讨会

作者： Jianhua Tao, Meng ZhangNational Laboratory of Pattern Recognition, Institute of Automation, Chinese Academyy of Sciences

Voice conversion has become more and more important in speech technology, however most of current works have to use parallel corpus including both source and target speaker as the training corpus, that limits the application of the technology. In the talk, we present a method of text-independent voice conversion which uses non-parallel corpus for the training. We use phonetic information for data alignment of non-parallel corpus. HMM is used for representing the phonetic structure of training speech. States belong to same phoneme are considered together as a phoneme cluster. By the adaptation of corresponding phoneme clusters from source and target speech, state mapped codebook is established using weighted linear transform. For each source vector, several nearest clusters are considered simultaneously while mapping in order to generate a continuous and stable transform. Then, the text-independent voice conversion system is finally created. Final subjective experiments based on ABX tests and MOS tests show that the proposed method gets the similar converting performance and better speech quality compared to the conventional voice conversion systems. The proposed technique is also applicable to both intra-lingual and cross-lingual voice conversion.

关键词： HMM Data alignment for text-independent voice conversion

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BOOST GRAPHEME-TO-PHONEME CONVERSION FOR MANDARIN TTS

BOOST GRAPHEME-TO-PHONEME CONVERSION FOR MANDARIN TTS

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第十届全国人机语音通讯学术会议暨国际语音语言处理研讨会

作者： Lifu Yi1, Jian Li1, Jie Hao1, Ziyu Xiong2 1Toshiba (China) Research and Development Center, Beijing, 100086 2Institute of Linguistics, Chinese Academy of Social Sciences, Beijing, 100732

In this paper, several methods are introduced to boost grapheme-to-phoneme (G2P) conversion models for Chinese text-to-speech (TTS) systems. We try to ease the critical problem of data sparsity with combined approaches. Firstly, we introduce a text-design method to cover more contexts of G2P text corpus as many as possible. Secondly, we use various data-driven methods for modeling, and then we make comparisons to select the best method for each polyphonic word. Finally, we build independent models for some neutral tone words besides the normal G2P models, which help to achieve more compact and flexible G2P models. The experiments show that these methods yield more than 50% relative error reduction both for normal polyphonic words and Chinese neutral tones.

关键词： Grapheme-to-phoneme conversion text design Chinese neutral tone speech synthesis

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Theoretical Mechanism Study of CH with C3H6

Theoretical Mechanism Study of CH with C3H6

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第十届全国计算(机)化学学术会议

作者： Chia-chung Sun State Key Laboratory of Theoretical and Computational Chemistry Institute of Theoretical ChemistryJilin University

A detailed theoretical study is performed at the B3LYP/6-311G(d,p) and G3B3(single-point) levels as an attempt to understanding the reaction mechanism of CH with *** the doublet potential energy surface,the carbenoid insertion of CH to the C=C bond or the C-H(-CH) bond of CH can produce the three-membered ring isomer 1 CH-cCHCHCH,and the chainlike isomer 4 CHCHCHCH,which can take subsequent isomerization and dissociation steps lead to various *** the products,P(cis-CHCHCHCH+H) and P (trans-CHCHCHCH+H) may be the most favorable products with comparable yields,P (CH-cCHCHCH+H),P(cCHCHCH+CH),and P(CH-cCCHCH+H) may be the much less competitive products,followed by the least feasible products P(CHCCH+CH) and P (CHCCCH+H).Other products may have undetected *** the intermediates and transitions involved in CH+CH reaction all lie lower than the reactant,the title reaction is expected to be fast,which is consistent with the measured large rate constant in *** present paper may be helpful to understanding the mechanism of CH towards other unsaturated hydrocarbons.

关键词： Reaction mechanism Potential energy surface(PES) methylidyne(CH) propene(C3H6)

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A Novel Method for Protein-Ligand Binding Affinity Prediction and the Related Descriptors Exploration

A Novel Method for Protein-Ligand Binding Affinity Predictio...

引用

第十届全国计算(机)化学学术会议

作者： Shuyan Li~a,Lili Xi~a,Chengqi Wang~a,Jiazhong Li~a,Beilei Lei~a,Huanxiang Liu~b, Xiaojun Yao~(a*) (a Department of Chemistry,Lanzhou University,Lanzhou 730000,China b School of Pharmacy,Lanzhou University,Lanzhou 730000,China)

A novel method was developed to predict the binding affinity of protein-ligand based on a comprehensive set of structurally diverse protein-ligand *** 1,300 protein-ligand complexes with binding affinity（493 complexes with K and 807 complexes with K） from the refined dataset of PDBbind Database（release 2007） were studied in the predictive model *** this method,each complex was described using calculated descriptors from three blocks:protein sequence,binding pocket and ligand ***, the protein-ligand complexes data were rationally split into representative training and test sets by full consideration of the validation of the *** molecular descriptors relevant to the binding affinity were selected using the ReliefF method combined with least squares support vector machines（LS-SVMs） modeling method based on the training data *** final optimized LS-SVMs models were developed using the selected descriptors to predict the binding affinities of K and *** correlation coefficients（R） of training set and test set for K model were 0.890 and *** corresponding correlation coefficients for the K model were 0.922 and 0.742,*** prediction method proposed in this work can give better generalization ability than other recent published methods and can be used as an alternative fast filter in the virtual screening of large chemical database.

关键词： Protein-ligand binding affinity ReliefF method Least squares support vector machines(LS-SVMs) Model validation

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A statistical approach to study the rules of peptide fragmentation:a preliminary study

A statistical approach to study the rules of peptide fragmen...

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第十届全国计算(机)化学学术会议

作者：董乃平欧阳永中梁逸曾中南大学化学化工学院中药现代化研究中心

The’top down’ statistical analysis of tandem mass spectra and’bottom up’ chemical study of protonated peptides have revealed many rules of peptide fragmentation during decades, and make the prediction of mass spectrum for a certain peptide *** we present a careful insight into the major rules of peptide fragmentation by statistical analysis of mass spectra data extracted from Human and Ecoli peptide library(NIST peptide mass spectral libraries, http://***/).The results show that though composition of amino acids varied peptide to peptide,there still appears high probability ion types that dominantly dissociated in spectra at different peptide charge(p-18 in fig.1A and y in fig.1b).And the distributions of ion types identified by the three highest mass peaks in each spectrum are consistent when comparing Ecoli peptide library with Human peptide library(fig.2).Thus one can pick specific ion types to characterize the mass spectrum,which is very important in mass spectrometry quality control, and to apply to the systematic investigation of fragmentation pathways of protonated peptides to learn how the protonated peptide dissociated.

关键词： rule of peptide fragmentation statistical analysis peptide ion types mass spectrometry

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Distinction between the tryptophan and tryptamine derivatives from the Characteristic fragmentations

Distinction between the tryptophan and tryptamine derivative...

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第十届全国计算(机)化学学术会议

作者：欧阳永中梁逸曾罗小王琴中南大学化学化工学院中药现代化研究中心

＜正＞The derivatives of tryptophan and tryptamine are distinguished from the characteristic fragmentation mechanisms by the density functional theory（DFT） at the B3LYP/6-31+G（d,p） *** main product ions have been predicted by natural spin density,natural charges of molecular radical cations,and the variations of geometries from neutral to cationic *** results show that the more intense base peak produced by main primaryα-cleavage fragmentation can be regarded as the characteristic of such two kinds of indole alkaloids,which will be very helpful for characterizing the fragmentation mechanisms of such indole *** importantly,it is found that nearly all derivatives for the primary and secondarily substituent tryptamine,there is a relatively more intense peak only inferior to the base peak,as compared to the derivatives of *** can be used to aid in distinguishing between fragmentation patterns of such two kinds of indole alkaloids The DFT calculations demonstrate that the abundant product ion is derived from the favorable H rearrangement compared to other fragmentations.

关键词： characteristic fragmentation mechanisms natural spin density natural charges molecular radical cations tryptamine tryptophan α-cleavage fragmentation

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Pronunciation Modeling for Nonstandard Speech Using Phonetic Feature Distance and Optimal Gaussian Mixture Sharing

Pronunciation Modeling for Nonstandard Speech Using Phonetic...

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第十届全国人机语音通讯学术会议暨国际语音语言处理研讨会

作者： Yi Liu 1, Yongsheng Yang 2, Shilei Huang 2,3, Wenxiao Cao 1 1. Tsinghua University 2. HKUST-IER Intelligent Media and Speech Lab 3. Hong Kong University of Science and Technology

Pronunciations in nonstandard speech that including causal speech, accented speech, spontaneous and conversational speech tend to be much more varied than in carefully read speech. ASR systems can reach an accuracy of above 90% when evaluated on read speech, but the accuracy of nonstandard speech is much lower. This high error rate is due in part to the poor modeling of the diversity of pronunciation variations within nonstandard speech. In this paper, we propose modeling the variations at iterative acoustic model training as well as acoustic model generation levels. We describe our method of incorporating phonetic feature distance into the calculation of phone variation probabilities. We also present an efficient criterion for choosing the optimal Gaussian mixture components from surface states, and share the selected Gaussian mixture components with canonical states according to variation probabilities. Experiments have shown that phonetic feature distance based state level Gaussian mixture sharing gives a significant syllable error rate reduction of 3.05% absolutely with respect to the baseline.

关键词： Nonstandard Speech Phonetic Feature Distance Gaussian Mixture Sharing

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DFT Study on the Mechanism of Amides to Aldehydes Using Cp2Zr(H)Cl

DFT Study on the Mechanism of Amides to Aldehydes Using Cp2Z...

引用

第十届全国计算(机)化学学术会议

作者： Juping Wang,Hui Gao,Cheng-Yong Su,Xianfang Xu,Cunyuan Zhao~*,Fenglei Cao MOE Laboratory of Bioinorganic and Synthetic Chemistry,School of Chemistry and Chemical Engineering, Sun Yat-Sen University,Guangzhou 510275,P.R.China,

The amide group is an essential motif in biological systems as well as in important molecules in the areas of polymers,natural products,and *** detailed mechanism of amides to aldehydes using CpZr（H）Cl has been investigated utilizing density functional theory（DFT） calculations done at the B3LYP/6-31G（d,p）(Lanl2dz for Zr) *** calculations suggest the first step of the reaction is the insertion of C=O into Zr-H through"inside"mode,leading to the formation of the Zr-O *** anhydrous conditions, the cleavage of O-C bond of zirconium oxygen intermediate,resulting in the formation of iminium cation is both kinetically and thermodynamically ***,under hydrous conditions,the cleavage of O-C bond of zirconium oxygen intermediate,resulting in the formation of highly active iminium cation intermediate occurs with the assistance of water hydrogen ***,this step is also the rate-determining one and the activation energy is 19.8 kcal/*** water molecule attacks iminium cation to produce amine ***,the water-catalyzed elimination reaction occurs to yield object product *** hydrogen bonding plays an important role in assisting the cleavages of O-C and C-N *** above mechanism indicates that the sources of aldehyde-group oxygen and hydrogen in object product aldehyde are HO and CpZr（H）Cl,respectively,which is consistent with the experimental observations.

关键词： amides aldehydes mechanism density functional theory

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3D-QSAR and Docking Analyses of c-Src Inhibitors

3D-QSAR and Docking Analyses of c-Src Inhibitors

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第十届全国计算(机)化学学术会议

作者： Wen Juan Wua,b,Rong Zhanga,Yong Shenb,Kang-Cheng Zhengb~* a Department of Physical Chemistry,Guangdong Pharmaceutical University,Guangzhou,510006, b School of Chemistry and Chemical Engineering,Sun Yat-Sen University,Guangzhou,510275,

Three-dimensional quantitative structure-activity relationship（3D-QSAR） and docking studies were performed on a series of cyanoquinoline derivatives inhibiting c-Src *** statistically significant model was established of 50 molecules,which were validated by a test set of 20 *** CoMFA model yielded a q=0.609,non cross-validated R of 0.891,F value of 196.267,and standard error of estimate=0.118 while the CoMSIA model yielded the best predictive model with a q=0.653,non cross-validated R of 0.843,F value of 122.735,and standard error of estimate=*** indicate that the 3D topology structure of active site of c-Src kinase from the docking analysis is in good agreement with 3D-QSAR model for this series of *** on the contour maps obtained from 3D-QSAR and docking analyses,some key structural factors of the compounds were revealed as follows:（1）The substituent R should be higher electronegativity and small steric volume groups.（2）Higher electronegativity on the first atom of substituent R is favorable to the activity.（3） Selecting substituent R' to be a pyridyl group may increase the activity of compound,***,the interation information between target and ligand was presented in *** results will be useful for design of novel and potent c-Src kinase inhibitors.

关键词： cyanoquinoline derivatives c-Src docking 3D-QSAR

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A comparative study on adhesion of Pt layers to the NiO(100) and IrO2(110) surfaces

A comparative study on adhesion of Pt layers to the NiO(100)...

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第十届全国计算(机)化学学术会议

作者：杨建辉李润伟陈亮中国科学院宁波材料技术与工程研究所

Pt/NiO films have been of intensive interest for applications in the resistance random access memory since NiO crystalline thin film has extraordinary repetitive resistance switching (RS) ***,theⅠ-Ⅴcurves of Pt/NiO films are not stable enough for memory switching,which makes Pt/NiO films encounter difficulty in the practical device applications. Recently,Kim and coworkers reported that the stability of theⅠ-Ⅴcurves can be significantly improved by inserting thin IrO layers into the Pt/NiO *** thin IrO layer is able to greatly enhance the crystallinity of NiO *** fact,the Pt-oxide interfacial reaction has a strong impact on the RS ***,an atomistic understanding of the different nature of bonding of Pt layers to NiO and IrO surfaces is a key step toward exploring the underlying causes of these ***,to our best knowledge,there is limited study on such systems,especially the Pt/IrO interface. In the present study,we report a comparative study on the Pt/NiO and Pt/IrO interfaces from first *** is found that Pt layers can bind with the IrO surface much stronger than the NiO *** adhesion strength is determined by the Pt-O ionic and Pt-Ni(or Pt-Ir) metallic-covalent *** Pt layers induce corrugation of the oxide surfaces and loosen the Ni-O(or Ir-O) bonding *** dissolution of Ni atoms into Pt slab appears to enhance the adhesion strength by forming stronger Ni-O ***,the adhesion of IrO/NiO interface is also stronger than that of Pt/NiO.

关键词： Density functional theory interface work of adhesion

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