检索结果-内蒙古大学图书馆

International Conference on Web-Age information Management Workshops (WAIM)

作者： Xiang Li Zhou Da Xiaofeng Meng Renmin University of China Beijing CN Key Laboratory of Data Engineering and Knowledge Engineering MOE School of Information Renmin University of China China

Compared with traditional magnetic disks, flash memory has many advantages and has been used as external storage media for a wide spectrum of electronic devices (such as PDA, MP3, digital camera and mobile phone). As the capacity increases and price drops, it looks like a perfect alternative for magnetic disks. However, due to hardware limitations of flash memory, techniques including storage subsystem and indexing originally designed for magnetic disks can not run smoothly in a flash memory without any modification. In this paper we explore problems of indexing flash-resided data and present a new dynamical hash index for flash memory in two schemas. The analysis and experimental results validate the efficiency of our design.

关键词： Indexes Flash memory Algorithm design and analysis Writing Tuning Indexing Arrays

来源：评论

学校读者我要写书评

暂无评论

Extracting Feature and Opinion Words Effectively from Chinese Product Reviews

Extracting Feature and Opinion Words Effectively from Chines...

引用

International Conference on Fuzzy Systems and knowledge Discovery (FSKD)

作者： Wei Wei Hongyan Liu Jun He Hui Yang Xiaoyong Du Information School Renmin University of China China School of Economics and Management Tsinghua University China Key Laboratory of Data Engineering and Knowledge Engineering MOE China

Nowadays more and more people like to publish their comments on a product on the Web. Mining such unstructured data (product reviews) is exciting hot and challenging research and application topic. In this paper, we focus on mining product reviews written in Chinese. We aim at extract the structural information from Chinese product reviews. By structural information, we mean product features and corresponding opinion words expressed in each review text. There are already some works done for reviews written in English, but less in Chinese. In this paper, we propose an effective method to extract candidate features and some effective pruning rules to prune the features. Also, we introduce a pattern extraction and matching step to improve our results. The experiment results show our approach is very effective, and has a good recall and precision.

关键词： Feature extraction data mining Negative feedback information retrieval Fuzzy systems Conference management knowledge management engineering management Helium Laboratories

来源：评论

学校读者我要写书评

暂无评论

The Design of an Open Hybrid Recommendation System for Mobile Commerce

The Design of an Open Hybrid Recommendation System for Mobil...

引用

International Conference on Computational Intelligence for Modelling, Control and Automation, and International Conference on Intelligent Agents, Web Technologies and Internet Commerce

作者： Chengzhi Liu Caihong Sun Jia Yu Information School and Key Laboratory of Data Engineering and Knowledge Engineering Renmin University of China Beijing China School of Electrical Engineering and Telecommunications University of New South Wales Sydney Australia

To meet more and more complex recommendation needs, it is quite important to implement hybrid recommendations for mobile commerce. In this paper, we propose a design for open hybrid recommendation systems in mobile commerce, which could integrate multiple recommendation algorithms together to improve recommendation performance. First, three solutions for an open hybrid recommendation approach are discussed in detail, which are generic customer profile, weighted hybrid recommendation algorithm, and mobile device profile creation. After that, we give out a multi-agent architecture design to make the three solutions work together. Finally a prototype system based on our proposed architecture is implemented to demonstrate the feasibility of our design and evaluate the performance of the proposed open hybrid recommendation system.

关键词： Business Customer profiles Context awareness Laboratories data engineering knowledge engineering Prototypes XML Sun Australia

来源：评论

学校读者我要写书评

暂无评论

Non-linearity Estimation and Temperature Compensation of Capacitor Pressure Sensors Using Least Square Support Vector Regression

Non-linearity Estimation and Temperature Compensation of Cap...

引用

International Symposium on knowledge Acquisition and Modeling, KAM

作者： Xiaoh Wang Key Laboratory of Numerical Control of Jiangxi Provinc Jiujiang University Jiujiang Jiangxi China School of Electronic and Information Engineering Dalian University of Technology Dalian China

A new nonlinear compensation technique to capacitor pressure sensor (CPS) based on least square support vector regression (LSSVR) is proposed. In this technique, LSSVR is used as an inverse model of the CPS; therefore, the proposed technique can automatically compensate the effect of the associated non-linearity to estimate the applied pressure. Furthermore, the flexibility of the proposed technique effectively compensates any variation of the CPS's output occurring due to change in environmental temperature. The results of actual CPS compensation experiment indicate that this LSSVR approach is a useful alternative to the existing ones. This technique would be useful for other types of sensors such as thermocouples, flow sensors, magnetometer etc., possessing similar nonlinear response characteristics. The presented method has a potential future in the field of instrumentation and measurement.

关键词： Temperature sensors Capacitors Capacitive sensors Least squares approximation Magnetic sensors Sensor phenomena and characterization Thermal sensors Least squares methods Inverse problems Magnetometers

来源：评论

学校读者我要写书评

暂无评论

Energy Efficient Multicast Routing for Discrete Power Levels in Ad Hoc Sensor Networks

Energy Efficient Multicast Routing for Discrete Power Levels...

引用

The 4th International Conference on Wireless Communications, Networking and Mobile Computing(第四届IEEE无线通信、网络技术及移动计算国际会议)

作者： Deying Li Qinghua Zhu Zheng Li Key Laboratory of Data Engineering and Knowledge Engineering (Renmin University of China) MOE Scho School of Information Renmin University of China Beijing 100872 P.R.China

In this paper, we discuss the energy efficient multicast problem for discrete power levels in ad hoc sensor wireless networks. The problem of our concern is: given n nodes and each node v has l(v) transmission power levels and a multicast request (s, D), how to find a multicast tree rooted at s and spanning all destinations in D such that the total energy cost of the multicast tree is minimized. This problem is NP-hard. We propose a NWM_DST algorithm which has a theoretical guaranteed approximation performance ratio, and two efficient heuristics MNJT and g-D-MIP for multicast tree problem. Simulation results have shown efficiency of our proposed algorithms.

关键词： wireless sensor network energy efficiency approzimation algorithm multicast routing

来源：评论

学校读者我要写书评

暂无评论

Sequence encryption producing method based on multi-objective evolutionary algorithm

引用

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2008年第8期30卷 69-73页

作者： Li, Kang-Shun Pan, Wei-Feng Zhang, Wen-Sheng Li, Yuan-Xiang School of Information Engineering Jiangxi University of Science and Technology Ganzhou 341000 China Institute of Automation Chinese Academy of Sciences Beijing 100080 China State Key Laboratory of Software Engineering Wuhan University Wuhan 430072 China

In this paper, two criteria used to evaluate the randomness of encryption stream are turned into two objectives of Multi-objective Evolutionary Algorithm (MOEA), and a new sequence encryption producing method based on MOEA was proposed (called MOEASEP). Because MOEASEP was based on the randomness of evolutionary operators and the features of MOEA, the encryption streams produced by MOEASEP had good merits of high randomness, chaos and long period, which had also been demonstrated in the experiments.

关键词： Evolutionary algorithm Multi-objective evolutionary algorithm (MOEA) Sequence encryption

来源：评论

学校读者我要写书评

暂无评论

Soft sensor modeling method for freezing point of diesel fuel based on PCA and LS-SVM

Soft sensor modeling method for freezing point of diesel fue...

引用

World Congress on Intelligent Control and Automation (WCICA)

作者： Xiaohong Wang Key Laboratory of Numerical Control of Jiangxi Jiujiang University Jiujiang China School of Electronic and Information Engineering Dalian University of Technology Dalian China

To solve the problems of real-time on-line measurements of freezing point of diesel fuel, a novel method of soft sensor with near-infrared (NIR) spectrometry was proposed based on the integration of both principal component analysis (PCA) and least squares support vector machines (LS-SVM). In this method, the PCA was incorporated into the model, which not only solved the linear correlation of the input, but also simplified the LS-SVM structure and improved the training speed. Then, the soft sensor model for freezing point was established using LS-SVM regression algorithm. The model performance has been tested and the results show that the propose method is superior to the soft sensor model based on BP neural network or PCA+SVM. So it can satisfy the demand of the on-lines measurement of freezing point.

关键词： Principal component analysis Support vector machines Artificial neural networks Risk management Monitoring Spectroscopy Real time systems

来源：评论

学校读者我要写书评

暂无评论

An Edit Distance Algorithm with Block Swap

An Edit Distance Algorithm with Block Swap

引用

The 9th International Conference for Young Computer Scientists(第九届国际青年计算机大会)

作者： Tian Xia Key Laboratory of Data Engineering and Knowledge Engineering Renmin University of China MOE Beijing 100872 China School of Information Resource Management Renmin University of China. Beijing 100872 China

The edit distance between two given strings X and Y is the minimum number of edit operations that transform X into Y. In ordinary course, string editing is based on character insert, delete, and substitute operations. It has been suggested that extending this model with block edits would be useful in applications such as DNA sequence comparison and sentence similarity computation. However, the existing algorithms have generally focused on the normalized edit distance, and seldom of them consider the block swap operations at a higher level. In this paper, we introduce an extended edit distance algorithm which permits insertions, deletions, and substitutions at character level, and also permits block swap operations. Experimental results on randomly generated strings verify the algorithm's rationality and efficiency. The main contribution of this paper is that we present an algorithm to compute the lowest edit cost for string transformation with block swap in polynomial time, and propose a breaking points selection algorithm to improve the computation speed.

关键词： Edit distance edit operation block swap string matching.

来源：评论

学校读者我要写书评

暂无评论

Research on spatio-temporal evolution of land use based on compositive fractal model

引用

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2008年第1期30卷 154-157页

作者： Wu, Hao Chen, Xiao-Ling Cai, Xiao-Bin Dai, Jian-Zhao Li, Qing-Qing School of Resources and Environmental Engineering Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan 430079 China Key Laboratory of Poyang Lake Ecological Environment and Resource Development Jiangxi Normal University Nanchang 330027 China

The land use pattern and evolution have the characteristics of multi-dimension, complication and integration, so that the traditional models based on Euclid geometry and single fractal dimension shows great limitations in describing the process and pattern of urban land use structure. Therefore, a compositive fractal model, which comprised of three fractal dimensions such as the boundary dimension, the radial dimension as well as the information entropy dimension, were developed. Subsequently, an example of application research is experimented in the Ezhou town through remote sensing imagines in 1992 and 2002. It makes a conclusion that the compositive fractal model can effectively analyze the complexity, centrality and equilibrium of land use.

关键词： Compositive model Fractal model Land use structure Spatio-temporal evolution

来源：评论

学校读者我要写书评

暂无评论

Comparative Analysis of Genetic Algorithm and Ant Colony Algorithm on Solving Traveling Salesman Problem

Comparative Analysis of Genetic Algorithm and Ant Colony Alg...

引用

IEEE International Workshop on Semantic Computing and Systems, WSCS

作者： Kangshun Li Lanlan Kang Wensheng Zhang Bing Li School of Information Engineering Jiangxi University of Science and Technology China Institute of Automation Chinese Academy and Sciences China State Key Laboratory of Engineering Software Wuhan University of China China

ISBN: (纸本)9780769533162

Ant Colony Algorithm and Genetic Algorithm (GA), two bionic-inspired optimization algorithms, have great potentials to solve the combination optimization problems, respectively used in solving traveling salesman problem, but there are some shortcomings if only one of them is used to solve TSP. Performance comparative analysis have been done by using ACA and GA respectively in solving TSP in this paper. The experiments show the advantages and disadvantages used only ACA or GA, we can overcome the shortcomings if GA and ACA are combined to solve TSP and get faster convergent speed and more accurate results compared with only using ACA or GA.

关键词： travelling salesman problems ant algorithm Gallium Genetic Algorithm (GA) Optimization algorithms Solve

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：