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Integration of GP and GA for mapping population distribution

INTERNATIONAL JOURNAL OF GEOGRAPhiCAL INFORMATION SCIENCE 2010年第1期24卷 47-67页

作者： Liao, Yilan Wang, Jinfeng Meng, Bin Li, Xinhu Chinese Acad Sci Inst Geog Sci & Nat Resources Res Beijing 100101 Peoples R China Beijing Union Univ Coll Arts & Sci Beijing 100083 Peoples R China Chinese Acad Sci Inst Urban Environm Xiamen 361003 Peoples R China

Mapping population distribution is an important field of geographical and related research because of the frequent need to combine spatial data representing socio-demographic information across various incompatible spatial units. However, the research may become very complex and difficult when a population in multiple places is estimated by various factors. Previous efforts in the field have contributed to the selection of appropriate independent variables and the creation of different population models. However, the level of accuracy obtainable with these studies is limited by the spatial heterogeneity of population distribution within the individual census districts, particularly in large rural areas. A high-accuracy modelling method for population estimation based on integration of Genetic programming (GP) and Genetic Algorithms (GA) with Geographic Information Systems (GIS) is presented in this paper. GIS was applied to identify and quantify a set of natural and socioeconomic factors which contributed to population distribution, and then GP and GA were used to build and optimise the population model to automatically transform census population data to regular grids. The study indicated that the proposed method performed much better than the stepwise regression analysis and adapted gravity model methods in estimating the population of both urban and rural areas. More importantly, this proposed method could provide a single, unified approach to mapping population distribution in various areas because the paradigms of these algorithms are general.

关键词： Mapping population distribution Surface modelling GIS GP GA

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A Novel Digital Coded Track Signal-ITRS Based on TVM430

A Novel Digital Coded Track Signal-ITRS Based on TVM430

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IEEE 72nd Vehicular technology Conference Fall 2010

作者： Kong, Yong Tan, Zhen-Hui Du, Pu-Xuan Jiang, Xiao-Qing Beijing JiaotongUniv State Key Lab Rail Traff Control & Safety Beijing Peoples R China Beijing Jiaotong Univ Sch Elect & Informat Engn Beijing Peoples R China Patent Examinat Cooperat Ctr State Intellectual P Beijing Peoples R China

ISBN: (纸本)9781424435746

With the developing of the high-speed railways, the requirement for railway signalling turns more and more strict. Came from France, the TVM430 signal has more information up to 27 bits digital word, with each bit corresponding to one of the 27 frequencies modulated onto the carrier frequency in the track circuits. The presence of a particular frequency indicates a "1" bit and lack of corresponds to a "0". But the slow demodulation is the biggest flaw for TVM430. To solve the above problems, we design a new digital coded track signal - Improved TVM430 Railway Signalling (ITRS). ITRS reduces the number of TVM430's modulation frequency while provides the same information capacity as TVM430. We also search for cycle generating polynomial, add parity checking to the important code - speed identification code. New frequency, amplitude and phase are defined for frequency modulated signals. ITRS performs better in information capacity, reliability and demodulation speed.

关键词： RAILWAY SIGNAL Channel capacity CARRIER FREQUENCY Digit Demodulation Polynomial Digital Binary digits high-speed railway frequency-modulated signal Track circuits

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Treatment of lignite-derived water produced from hot press upgrading by a combined A²/O-UBAF process

Treatment of lignite-derived water produced from hot press u...

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4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE)

作者： Zhang Chunhui He Xuwen Zhu Shuquan Wang Hao Wang Xiaochan China Univ Min & Technol Beijing Sch Chem & Environm Engn Beijing Peoples R China Beijing Sinorichen Environm Protect Co Ltd Beijing Peoples R China

ISBN: (纸本)9781424447138

The water quality of lignite-derived water produced from Hot Press Upgrading (HPU) is in breach of the reuse standard for power plant's circulating cooling water. This study assesses the water characteristics of lignite-derived water as follows: The BOD5/COD ratio is 0.85. The pH value of lignite-derived water samples is from 6.65 to 6.85. The lignite-derived water's properties parameters such as turbidity, BOD5, CODCr, Mn and NH3-N are higher than the reuse standard for power plant's circulating cooling water. A combined treatment process, A(2)/O-UBAF, was developed for remediation of the lignite-derived water in this paper. After the treatment, the lignite-derived water's quality can meet the reuse standard for power plant's circulating cooling water in china.

关键词： Lignite-derived water Lignite Hot press upgrading A(2)/O UBAF

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A hybrid collaborative filtering recommendation mechanism for P2P networks

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FUTURE GENERATION COMPUTER SYSTEMS-THE INTERNATIONAL JOURNAL OF ESCIENCE 2010年第8期26卷 1409-1417页

作者： Liu, Zhaobin Qu, Wenyu Li, Haitao Xie, Changsheng Dalian Maritime Univ Sch Informat Sci & Technol Dalian 116026 Peoples R China Chinese Acad Surveying & Mapping Inst Photogrammetry & Remote Sensing Beijing 100039 Peoples R China Huazhong Univ Sci & Technol WNLO Wuhan 430074 Peoples R China

With the increasing number of commerce facilities using peer-to-peer (P2P) networks, challenges exist in recommending interesting or useful products and services to a particular customer. Collaborative Filtering (CF) is one of the most successful techniques that attempts to recommend items (such as music, movies, web sites) which are likely to be of interest to the people. However, conventional collaborative filtering encounters a number of challenges on its recommendation accuracy. One of the most important challenges may be due to the sparse attributes inherent to the rating data. Another important challenge is that existing CF methods consider mainly user-based or item-based ratings respectively. In this paper a P2P-based hybrid collaborative filtering mechanism for the support of combining user-based and item attribute-based ratings is considered. We take advantage of the inherent item attributes to construct a Boolean matrix to predict the blank elements for a sparse user-item matrix. Furthermore, a Hybrid collaborative filtering (HCF) algorithm is presented to improve the predictive accuracy. Case studies and experiment results illustrate that our approaches not only contribute to predicting the unrated blank data for a sparse matrix but also improve the prediction accuracy as expected. (C) 2010 Elsevier B.V. All rights reserved.

关键词： Collaborative filtering Recommendation Sparse matrix Eigenvalue matrix Peer-to-peer (P2P) networks

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Sex-linked microsatellite marker detected in the female gametophytes of Undaria pinnatifida (Phaeophyta)

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PHYCOLOGICAL research 2010年第3期58卷 171-176页

作者： Shan, Ti Feng Pang, Shao Jun Chinese Acad Sci Inst Oceanol Marine Biol Culture Collect Ctr Qingdao 266071 Peoples R China

P>In our microsatellite analysis of three male and three female gametophytes of Undaria pinnatifida (Harv.) Suringar, a microsatellite marker (part of the locus Up-AC-2A8, GenBank accession no. AY738602.1) was only polymerase chain reaction-amplified in three female gametophytes. This putative female-specific marker was further tested by the use of 32 male and 21 female gametophytes maintained in the Marine Biological Culture Collection Centre, china. In addition, three sporophytes were included for confirmation. Results showed that the marker was present in all of the female gametophytes and sporophyte cultures, but absent in all of the male gametophytes. To our knowledge, this is the first sex-related marker ever reported in U. pinnatifida. The discovery of this marker will accelerate gender identification and shed light on our understanding of the mechanisms of sex determination at a molecular level in this commercially important seaweed.

关键词： gametophyte microsatellite marker sex determination sex-related Undaria pinnatifida

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TANGENT SPACE DISCRIMINANT ANALYSIS FOR FEATURE EXTRACTION

TANGENT SPACE DISCRIMINANT ANALYSIS FOR FEATURE EXTRACTION

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IEEE International Conference on Image Processing

作者： Lai, Zhihui Jin, Zhong Wong, W. K. Nanjing Univ Sci & Technol Sch Comp Sci & Technol Nanjing Peoples R China Hong Kong Polytech Univ Inst Textile & Clothing Hong Kong Peoples R China

ISBN: (纸本)9781424479948

In this paper, a novel method called tangent space discriminant analysis is proposed for dimensionality reduction and feature extraction. Differing from the recently proposed manifold learning methods completely operating on raw feature space, TSDA completely uses the local tangent space to represent the local within-class geometry and local between-class geometry. Assume that the face images of different people reside on different intrinsically low-dimensional sub-manifolds, TSDA is developed to preserve the locality of each sub-manifold and simultaneously maximize the local separability of different sub-manifolds by using local tangent space alignment. Experimental results show that TSDA achieves higher recognition rates than a few the state-of-the-art techniques.

关键词： Manifold learning Local tangent space alignment Feature extraction Face recogntion

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Using support vector regression coupled with the genetic algorithm for predicting acute toxicity to the fathead minnow

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SAR AND QSAR IN ENVIRONMENTAL research 2010年第5-6期21卷 559-570页

作者： Wang, Y. Zheng, M. Xiao, J. Lu, Y. Wang, F. Lu, J. Luo, X. Zhu, W. Jiang, H. Chen, K. Chinese Acad Sci Shanghai Inst Mat Med Drug Discovery & Design Ctr State Key Lab Drug Res Shanghai 200031 Peoples R China E China Univ Sci & Technol Sch Pharm Shanghai 200237 Peoples R China

The potential toxicity of chemicals may present adverse effects to the environment and human health. The quantitative structure-activity relationship (QSAR) provides a useful method for hazard assessment. In this study, we constructed a QSAR model based on a highly heterogeneous data set of 571 compounds from the US Environmental Protection Agency, for predicting acute toxicity to the fathead minnow (Pimephales promelas). An approach coupling support vector regression (SVR) with the genetic algorithm (GA) was developed to build the model. The generated QSAR model showed excellent data fitting and prediction abilities: the squared correlation coefficients (r2) for the training set and the test set were 0.826 and 0.802, respectively. Only eight critical descriptors, most of which are closely related to the toxicity mechanism, were chosen by GA-SVR, making the derived model readily interpretable. In summary, the successful case reported here highlights that our GA-SVR approach can be used as a general machine learning method for toxicity prediction.

关键词： toxicity prediction fathead minnow quantitative structure-activity relationship support vector regression genetic algorithm

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Parallel algorithm for real-time contouring from grid DEM on modern GPUs

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Science china(technological Sciences) 2010年第S1期53卷 33-37页

作者： CHEN Zhuo,SHEN Lei,ZHAO YanQing & YANG ChongJun State Key Laboratory of Remote Sensing Science,Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University,Beijing 100101,china 1. State Key Laboratory of Remote Sensing Science Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University Beijing 100101 China

A real-time algorithm for constructing contour maps from grid DEM data is *** runs completely within the programmable 3D visualization *** interpolation is paralleled by rasterizer units in the graphics card,and contour line extraction is paralleled by pixel *** each frame of the rendering,we first make an elevation gradient map out of original terrain vertex data,then figure out the final contour lines with image-space processing,and directly blend the results on the original scene to obtain a final scene with contour map using *** implement this method in our global 3D-digitalearth system with Direct3D?9.0c API and tested on some consumer level PC *** arbitrary scene with certain LOD level,the process takes less than 10 ms,giving topologically correct,anti-aliased contour lines.

关键词： contour map contour lines paralleled computing 3D terrain GPU digital earth

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Controlled fabrication and characterization of microspherical FeCO₃ and α-Fe₂O₃

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JOURNAL OF COLLOID AND INTERFACE SCIENCE 2010年第2期351卷 427-432页

作者： Liu, Xiaojie Wang, Hui Su, Changhua Zhang, Pengwei Bai, Jinbo NW Univ Xian Key Lab Synthet & Nat Funct Mol Chem Minist Educ Coll Chem & Mat Sci Xian 710069 Peoples R China NW Univ Xian Natl Key Lab Photoelect Technol & Funct Mat Natl Photoelect Technol & Funct Mat & Applicat Sc Inst Photon & Photon TechnolCulture Base Xian 710069 Peoples R China Ecole Cent Paris Lab MSS MAT CNRS UMR 8579 F-92295 Chatenay Malabry France

In this paper, the microspherical Fe2O3 was successfully obtained by calcining the FeCO3 sphere prepared by a hydrothermal route. The sphere morphology perfectly remained after the calcination of FeCO3 but the diameter of sphere decreased in a certain degree from 70-100 mu m to 50-70 mu m, which might be due to some loss of quantity during the calcination (FeCO3-Fe2O3). The sphere was solid and highly densified. At the same time, the effects of factors influencing the formation of FeCO3, such as PVP, reaction temperature were investigated. The simple formation process of FeCO3 was also proposed as follows: Fe2+ produced by the reduction of Fe3+ reacted with CO32- released from the decomposition of urea to form FeCO3 nanoparticle. Then, the formed nanoparticles aggregated together to produce sphere structure via oriented attachment. With the reaction time increasing, the sphere became solidness and densification. (C) 2010 Elsevier Inc. All rights reserved.

关键词： FeCO3 Fe2O3 Hydrothermal route Microsphere structure

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Generation and Analysis of Partially Haploid Cells with Cre-mediated Chromosome Deletion in the Lymphoid System

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JOURNAL OF BIOLOGICAL CHEMISTRY 2010年第34期285卷 26005-26012页

作者： Zhu, Yi Kim, Young-Mi Li, Shibo Zhuang, Yuan Duke Univ Med Ctr Dept Immunol Durham NC 27710 USA Fudan Univ Sch Life Sci Inst Dev Biol & Mol Med Shanghai 200433 Peoples R China Univ Oklahoma Hlth Sci Ctr Dept Pediat Oklahoma City OK 73014 USA

The fast accumulation of mutant mouse strains in recent years has provided an invaluable resource for phenotype-based genetic screens. However, study of lymphoid phenotypes can be obscured or impractical if homozygous mutations cause early embryonic defects. To aid phenotype screening of germ line mutations in the lymphoid system, we developed a method to induce loss of heterozygosity (LOH) in developing lymphocytes through chromosome deletion. Chromosome deletion was triggered by Cre/loxP-mediated inverse sister chromatid recombination in the G(2)/M phase of the cell cycle, leading to the generation of daughter cells missing part of or the entire recombinant chromosome. We show that the resulting cells were viable and capable of additional rounds of cell division, thus providing raw materials for subsequent phenotypic assessment. We used the recombination system to induce LOH at the E2A locus in developing B cells. A significant loss of pro-B and pre-B cells was observed when the wild-type allele was removed by chromosome deletion from the E2A heterozygous mice, a result consistent with the required role for E2A in B cell development. We also demonstrated the effectiveness of Cre-mediated chromosome deletion in the LOH assay for HEB function in T cell development. Thus, the Cre-mediated chromosome deletion provides a new and effective method for genome-wide assessment of germ line mutations in the lymphoid system.

关键词： Cell Division Chromosome Deletion Lymphatic System Pre-B Lymphocytes Loss of Heterozygosity Germ-Line Mutation Transcription Factor 3 B-Lymphocytes Haploid Cell Generations daughter cell

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