检索结果-内蒙古大学图书馆

2010 IEEE International Conference on Intelligent Computing and Intelligent Systems, ICIS 2010

作者： Wei, Li Kun, Zhang Wen, Xu Xi, Chen Department of Control Science and Engineering IPIC Key Lab. of Education Ministry of China Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424465835

In order to improve the efficiency of cold test for diesel engine product line, a mathematic model of six-cylinder diesel engine has been developed. The model is based on thermodynamic theory and dynamics mechanism, including valve actuating mechanism part which is an important part of cold test. The simulation of this model, implemented on Matlab.Simulink, includes system simulation and fault simulation. It is shown that the mathematic model of six-cylinder engine for cold test proves its importance for improving cold test technology. ©2010 IEEE.

关键词： Diesel engines

来源：评论

学校读者我要写书评

暂无评论

The modeling and simulation analysis of wooden perforated panel absorption structure

引用

Noise and Vibration Worldwide 2010年第10期41卷 72-75页

作者： Guo, Ming-Hui Hou, Qing-Quan Wang, Jin-Man Yu, Hai-Peng Key Lab. of Bio-Based Material Science Technology of Ministry of Education Northeast Forestry University Harbin 150040 China School of Mechanical Engineering Heilongjiang University of Science and Technology Harbin 150027 China

The study analyzed the acoustical absorption performance of wooden perforated panels with finite element analysis software-ANSYS. The research process include modeling, meshing, loads, solution and results display. Simulation results showed that software ANSYS was good at absorption performance analysis of wooden perforated panels. There are some pressure distribution zones with peak and valley alternation between speaker and the tested material of the built model. It coincides with test result of real experiment equipment. The selections of structural parameters of wooden perforated panel lead to changes for solution.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Efficient common items extraction from multiple sorted lists

Efficient common items extraction from multiple sorted lists

引用

12th International Asia Pacific Web Conference, APWeb 2010

作者： Lu, Wei Rong, Chuitian Chen, Jinchuan Du, Xiaoyong Cheong Fung, Gabriel Pui Zhou, Xiaofang School of Information Renmin University of China China Key Labs of Data Engineering and Knowledge Engineering Ministry of Education China School of Computing Informatics Arizona State University United States School of ITEE University of Queensland Australia

ISBN: (纸本)9780769540122

Given a set of lists, where items of each list are sorted by the ascending order of their values, the objective of this paper is to figure out the common items that appear in all of the lists efficiently. This problem is sometimes known as common items extraction from sorted lists. To solve this problem, one common approach is to scan all items of all lists sequentially in parallel until one of the lists is exhausted. However, we observe that if the overlap of items across all lists is not high, such sequential access approach can be significantly improved. In this paper, we propose two algorithms, MergeSkip and MergeESkip, to solve this problem by taking the idea of skipping as many items of lists as possible. As a result, a large number of comparisons among items can be saved, and hence the efficiency can be improved. We conduct extensive analysis of our proposed algorithms on one real dataset and two synthetic datasets with different data distributions. We report all our findings in this paper. © 2010 IEEE.

关键词： Problem solving

来源：评论

学校读者我要写书评

暂无评论

ParaCube: A scalab.e OLAP model based on distributed aggregate computing with sibling cubes

ParaCube: A scalable OLAP model based on distributed aggrega...

引用

12th International Asia Pacific Web Conference, APWeb 2010

作者： Zhang, Yansong Wang, Shan Huang, Wei Key Laboratory of the Ministry of Education for Data Engineering and Knowledge Engineering Beijing 100872 China School of Information Renmin University of China Beijing 100872 China Department of Computer Harbin Financial College Harbin Helongjiang 150030 China

ISBN: (纸本)9780769540122

The requirements of OLAP applications increase rapidly by dramatically increased data volume, users, query volume and query complexity. The requirement for shortening update period in data warehouse is another crucial factor for a scalab.e OLAP application. In this paper, we propose a scalab.e OLAP prototype to support the query processing with increasing data volume by distributing the whole fact tuples to multiple servers to construct a set of sibling cubes which can be merged together to obtain the whole cube. We employ a light weight distribution policy with fully duplicated dimension tables in each sibling server on the observation of very low proportion of space cost for dimension tables. OLAP query with distributed aggregate functions can be transformed into queries to be performed parallel in sibling servers. For non-distributed computing aggregate functions, such as median, the optimized median aggregate computing algorithm is proposed to reduce transmission volume between servers while computing the global median values. We also present a three-level framework in data warehouse to meet the requirement of shorter update period in "operational business intelligence". An asynchronous tunnel model is proposed to reduce update latency by pre-fetching updated tuples to OLAP processing server. Finally, we set up prototype system ParaCube to evaluate performance in SN (shared-nothing) system and multi-core platforms. © 2010 IEEE.

关键词： data warehouses

来源：评论

学校读者我要写书评

暂无评论

Towards comprehensive integration management of business continuity, records and knowledge

Towards comprehensive integration management of business con...

引用

作者： An, Xiaomi Wang, Wang Key Laboratory of Data Engineering and Knowledge Engineering Ministry of Education Renmin University of China Beijing 100872 China School of Information Resource Management Renmin University of China Beijing 100872 China

ISBN: (纸本)9788988678251

Many of management systems for business continuity, records and knowledge (BRK) are standalone. Connections and networks of business continuity management systems (BCMS), records management systems (RMS) and knowledge management systems (KMS) are expected to study for facing challenges from evidence-based collab.rations in a networked working environment, in terms of control of documented information for business efficiency;guarantee of evidentiality and quality of documented information for organizational effectiveness;and sharing, protecting and increasing values of records as business and knowledge assets for knowledge economy. Based on review of ideas of integration management thinking, best practice frameworks of business continuity management, records management and knowledge management, management models of BCMS, RMS and KMS, an architecture framework towards comprehensive integration management of BRK is proposed by vertical integration design and crosswise integration operations. Case studies demonstrate that such architecture framework has implications to enhance controls of efficiency, effectiveness, and economy of organizational resources and assets adaptable to complex global competition;to improve quality assurance of documented information for supporting evidence-based governance adaptable to dynamic changing of information and communication technologies;to consistent accumulation, sharing and exchanging evidence, memory and knowledge along e-business processes to promote collab.ration, optimization and innovation of BCMS, RMS and KMS.

关键词： knowledge management

来源：评论

学校读者我要写书评

暂无评论

A lung cancer lesions dectection scheme based on CT image

A lung cancer lesions dectection scheme based on CT image

引用

International Conference on Signal Processing Systems, ICSPS

作者： Jia, Tong Wei, Ying Wu, Cheng Dong School of Information Science and Engineering Northeastern University Shenyang China Key Lab. of Medical Image Computing of Ministry of Education Northeastern University Shenyang China

ISBN: (纸本)9781424468911

A new computer-aided detection (CAD) scheme for detecting lung nodules is proposed in this paper. Firstly, the lung region is segmented from the CT data using adaptive threshold algorithm etc;Secondly, building active contour model to segment and remove lung vessel accurately in the lung region;Next, suspicious nodules are detected and omitted renal vessel is filtered using a selective shape filter;Finally, nodule features are extracted and rule-based classifier is used to distinguish true or false positive nodules. Experiment results indicate that this scheme can help radiologist improve the diagnosis efficiency. © 2010 IEEE.

关键词： Image segmentation

来源：评论

学校读者我要写书评

暂无评论

Limit loads for cracked elbows under in-plane bending moment

Limit loads for cracked elbows under in-plane bending moment

引用

International Conference on Advanced Technology of Design and Manufacture, ATDM 2010

作者： Wang, C. Wang, Y.P. Li, P.N. Chen, J. Sun, X.M. Key Lab. of Safety Science of Pressurized System Ministry of Education School of Mechanical Engineering East China University of Science and Technology Shanghai 200237 China

ISBN: (纸本)9781849192385

Elbows are the type of components widely used in a piping system, and are particularly important from the point of view of structural behaviour. In practice, the existence of cracks in excess of the defect limit cannot be excluded. So it is very important to know the effect of cracks on limit loads of elbows for integrity assessment of the piping system. The existing closed-form limit loads for axial cracked elbows under in-plane bending moment are either too conservative or inadequate, therefore, the present studies focused on limit loads of elbows with axial cracks and the crack configurations were assumed to be constant-depth rectangle, subjected to in-plane opening and closing bending moments respectively. The crack-like defects were postulated to be in crown of elbows with different crack sizes. The limit loads and residual strength factors (RSFs) (ML/M0L) of cracked elbows with various ratios of t/rm and relative bending radius R/rm were investigated in detail, by using of three-dimensional (3D) non-linear finite element (FE) analyses, assuming elastic-perfectly-plastic material behaviour and taking geometric nonlinearity into account. The non-linear finite element (FE) analyses indicate that under the open/close bending modes, elbows exhibit different behaviour obviously at the elastic-plastic states. The results from comprehensive parametric studies indicate that the limit loads of cracked elbows may reduce with the increasing of crack length, and these trends are more serious for long radius elbows. Generally speaking, the thickness-radius ratio t/rm of elbow has insignificant effects on RSFs. Based on extensive limit load numeric data and comprehensive parametric studies, the revised closed form equations for cracked elbows involving effect of tangent pipes, were established. The results can be used for "Fitness-For-Service" assessment of elbow.

关键词： Cracks

来源：评论

学校读者我要写书评

暂无评论

Study on engineering knowledge management in collab.rative product design

Study on engineering knowledge management in collaborative p...

引用

2010 International Conference on Mechanic Automation and Control engineering, MACE2010

作者： Yan, L.J. Li, Z.B. Yuan, X.Y. State Key Lab. of Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 China Key Lab. of Education Ministry for Modern Design and Rotor-bearing System Xi'an Jiaotong University Xi'an 710049 China

ISBN: (纸本)9781424477388

Successful product design depends on the ability to effectively manage and share engineering knowledge and experience throughout the entire development process. Thus, this paper presents a distributed engineering knowledge management approach for the practice of collab.rative product design. Firstly, by combining meta-knowledge with XML based topic maps (XTM), a heterogeneous knowledge integration model in collab.rative product design is proposed. Then, based on the knowledge integration model and characteristics of collab.ration product design, a knowledge management-oriented collab.rative work process model is built and a knowledge management framework in collab.rative design is developed. Finally, a knowledge management system in collab.rative design is constructed. ©2010 IEEE.

关键词： knowledge management

来源：评论

学校读者我要写书评

暂无评论

Local methods for estimating SimRank score

Local methods for estimating SimRank score

引用

12th International Asia Pacific Web Conference, APWeb 2010

作者： Jia, Xu Liu, Hongyan Zou, Li He, Jun Du, Xiaoyong Cai, Yuanzhe Key Labs of Data Engineering and Knowledge Engineering Ministry of Education China Department of Computer Science Renmin University of China 100872 China Department of Management Science and Engineering Tsinghua University 100084 China Department of Computer Science University of Texas Arlington TX 76019 United States

ISBN: (纸本)9780769540122

SimRank is a well known algorithm which conducts link analysis to measure similarity between each pair of nodes (nodepair). But it suffers from high computational cost, limiting its usage in large-scale datasets. Moreover, Links between nodes are changing over time. It may be desirable to quickly approximate the similarity score between certain nodepair without performing a large-scale computation on the entire graph. In our approach we propose a method to efficiently estimate the similarity score using only a small subgraph of the entire graph. We call this novel algorithm "Local-SimRank". The experimental results conducted on real datasets and synthetic dataset show that our algorithm efficiently produces good approximations to the global SimRank scores. Meanwhile, we prove that the Local-SimRank score LS(a, b) is always less than original SimRank score S(a, b) mathematically. © 2010 IEEE.

关键词： Approximation algorithms

来源：评论

学校读者我要写书评

暂无评论

Prediction model of sulfur precipitation in gas well with high H2S content

Prediction model of sulfur precipitation in gas well with hi...

引用

2010 International Conference on Computational and Information Sciences, ICCIS2010

作者： Li, Wen-Hua Liu, Jing-Cheng Zeng, Shun-Peng Zhang, Qi-Ming Xu, Chun-Bi Institute of Oil and Gas Engineering Chongqing University of Science and Technology Chongqing China Key Lab. for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering Ministry of Education Chongqing University Chongqing China

ISBN: (纸本)9780769542706

For the gas well with high H2S content, the process of sulfur deposition including the sulfur dissolution, precipitation, migration and deposition is a quite complex process. Relative to the solubility of sulfur under certain temperature and the pressure, the sulfur will be separated out when the content of sulfur in high sour gas is surpassed. Based on the theories of mass conservation, momentum conservation, energy conservation, and the transfer of heat in the radial directions of wellbore, we established the prediction model of the sulfur precipitation in the high H2S content gas well by using Roberts thermal empirical equation. In view of the examples, the sulfur separation at different levels of production is calculated and discussed by using the self-programming computer. © 2010 IEEE.

关键词： Forecasting

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：