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Ambiguity Resolution in Chinese Word Segmentation
( Sun Maosong ) 한국언어정보학회 1995 국제 워크샵 Vol.1995 No.-
A new method for Chinese word segmentation named Conditional F&BMM (Forward and Backward Maximal Matching) \vhich incorporates both bigram statistics (ie., mutual infonnation and difference of t-test between Chinese characters) and linguistic rules for ambiguity resolution is proposed in this paper The key characteristics of this model are the use of: (i) statistics which can be automatically derived from any raw corpus, (ii) a rule base for disambiguation with consistency and controlled size to be built up in a systematic way.
Identification of Chinese Personal Names in Unrestricted Texts
( Lawrence Cheung ),( Benjamin K Tsou ),( Maosong Sun ) 한국언어정보학회 2002 국제 워크샵 Vol.2002 No.-
Automatic identification of Chinese personal names in unrestricted texts is a key task in Chinese word segmentation, and can affect other NLP tasks such as word segmentation and information retrieval, if it is not properly addressed. This paper (1) demonstrates the problems of Chinese personal name identification in some IT applications, (2) analyzes the structure of Chinese personal names, and (3) further presents the relevant processing strategies. The geographical differences of Chinese personal names between Beijing and Hong Kong are highlighted at the end. It shows that variation in names across different Chinese communities constitutes a critical factor in designing Chinese personal name identification algorithm.
Compression Characteristics of Ultra-soft Clays Subjected to Simulated Staged Preloading
Huayang Lei,Xuechao Wang,Li Chen,Maosong Huang,Jie Han 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.2
Ultra-soft soils have high water content, low strength, and high compressibility. Staged preloading has been commonly used in China to improve ultra-soft soils during land reclamation before highways and other structures are constructed. In this study, seven series of one-dimensional consolidation tests were performed on undisturbed, remolded, or reconstituted specimens of three types of soils subjected to simulated, staged loading. Test results showed that the compression curves had two straight lines, which intersected at a yield stress. Burland’s concept of the intrinsic compression line was adopted to present the compression curves of reconstituted clays at different initial water contents. The intrinsic compression line was modified to better fit the test data for the stresses lower than 40 kPa. The coefficient of soil consolidation increased with an increase of the effective vertical stress as a result of the rate of increase in constrained modulus higher than that of decrease in permeability. The maximum coefficient of secondary consolidation, Cámax, was correlated with the ratio of the initial void ratio to the void ratio at yield stress by a unique curve, which was proposed to distinguish the pre-yield stress from the post-yield stress state. Test results showed that the secondary compression characteristics depended on the applied stress and the initial void ratio.
Fast FCS-MPC-Based SVPWM Method to Reduce Switching States of Multilevel Cascaded H-Bridge STATCOMs
Xiuqin Wang,Jiwen Zhao,Qunjing Wang,Guoli Li,Maosong Zhang 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
Finite control set model-predictive control (FCS-MPC) has received increasing attentions due to its outstanding dynamicperformance. It is being widely used in power converters and multilevel inverters. However, FCS-MPC requires a lot ofcalculations, especially for multilevel-cascaded H-bridge (CHB) static synchronous compensators (STATCOMs), since it has totake account of all the feasible voltage vectors of inverters. Hence, an improved five-segment space vector pulse widthmodulation (SVPWM) method based on the non-orthogonal static reference frames is proposed. The proposed SVPWM methodhas a lower number of switching states and requires fewer computations than the conventional method. As a result, it makesFCS-MPC more efficient for multilevel cascaded H-bridge STATCOMs. The partial cost function is adopted to sequentiallysolve for the reference current and capacitor voltage. The proposed FCS-MPC method can reduce the calculation burden of theFCS-MPC strategy, and reduce both the switching frequency and power losses. Simulation and experimental results validate theexcellent performance of the proposed method when compared with the conventional approach.
Fast FCS-MPC-Based SVPWM Method to Reduce Switching States of Multilevel Cascaded H-Bridge STATCOMs
Wang, Xiuqin,Zhao, Jiwen,Wang, Qunjing,Li, Guoli,Zhang, Maosong The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
Finite control set model-predictive control (FCS-MPC) has received increasing attentions due to its outstanding dynamic performance. It is being widely used in power converters and multilevel inverters. However, FCS-MPC requires a lot of calculations, especially for multilevel-cascaded H-bridge (CHB) static synchronous compensators (STATCOMs), since it has to take account of all the feasible voltage vectors of inverters. Hence, an improved five-segment space vector pulse width modulation (SVPWM) method based on the non-orthogonal static reference frames is proposed. The proposed SVPWM method has a lower number of switching states and requires fewer computations than the conventional method. As a result, it makes FCS-MPC more efficient for multilevel cascaded H-bridge STATCOMs. The partial cost function is adopted to sequentially solve for the reference current and capacitor voltage. The proposed FCS-MPC method can reduce the calculation burden of the FCS-MPC strategy, and reduce both the switching frequency and power losses. Simulation and experimental results validate the excellent performance of the proposed method when compared with the conventional approach.