共查询到20条相似文献，搜索用时 31 毫秒
1.
To construct data warehouse with heterogeneous, self-governing and distributed database system is a challenge. Two problems have to be solved: one is how to collect data from heterogeneous data sources by an effective method, the other is how to clear up and change the format of the data collected from data sources. The opening and the interact-operation property of Web Services is Analyzed. A Data Collection System based on Web Services, which communicates with heterogeneous data sources with SOAP and HTTP, has been designed. A Data Collector is introduced to clear up and to transform data with composition technology. The pivotal XML technology of transforming and loading up the data are discussed. 相似文献
2.
The traditional Enterprise Resouce Planning system belongs to the typical on-line transaction processing (OLTP) system. It just offers a management platform where enterprise policy-making level and staff can make decisions, but it can not offer necessary information satisfied for making decisions directly. The traditional ERP system is a very good back-office management system, but the developing enterprises need the ERP system with the front-office management function at the same time. The traditional ERP system integrated with data warehouse can realize the function change greatly because DW can remedy the limitations of the traditional ERP system. DW, integrated with the traditional ERP system in the way of system structure, can analyze the data drew from the ERP system, and deposit these sample data and analyzed results into itself so that users can inquire these later. It can help users find the potential value of data accumulated in the traditional ERP system, and then it can help enterprise gain extensive competition advantages for a long time. 相似文献
3.
The circumstances of rich data and lack of knowledge lead to the emergence of technology of data warehouse and data mining, and arouse the interests of people in various fields. This paper gives a comprehensive introduction about the basic ideas of data warehouse and data mining, key techniques, and the content of the main researches. This paper have also discussed the characteristics as well as developing potential of the combination of data warehouse and data mining.[WT5HZ] 相似文献
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The OLTP system can not afford the demand of decision support due to the drastic commerce competition, so the appearance of OLAP technology is importanct. The key technical of OLAP, the classical resolvent of data warehouse and the methods of data preprocessing are studied. A frame of parallel data extraction interface for commercial OLAP is proposed. Data preprocessing technology (data cleaning, data integration and transform, data reduction) connected with the frame is practically studied and applied. The eficiency and the practicality of the frame are illustrated by practical application. 相似文献
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Analysis and forecast for market have become important methods of making decision in most enterprises. It is the base of analysis and forecast to effectively store and make full use of the data in the distribution. Technology of data warehouse and OLAP provides the strong function of storing and integrating data, and mathematics methods provides a series of statistics and analysis tools. Combine IT and mathematics methods in the field of analysis and forecast for the data of distribution to put forward a design and implementation plan of application system in supporting decision based on data warehouse. The design exhibits the processes how to build data warehouse and multi-dimensional data, recommends the methods of analyzing and forecasting, and shows a good integration of advanced information technology and decision science. 相似文献
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Larger quantities of data about flight performance and flight condition are recorded by flight data recorder (FDR) during the aircraft's flying. It is an importance task to make 3D flying animation from the data on the process of flight data. The design ideas and realizing methods about the software of flying animation system driven by the data from relation database are presented. 相似文献
7.
LEI Xiao-wei 《保鲜与加工》2006,(7):102-104
The small-angle X-ray scattering(SAXS) technique is one of chief tools to study structures of macromolecules and meso-structures.As users of synchrotron radiation small angle X-ray scattering experimental station are increasing rapidly,it is necessary that data processing techniques are provided with them.Some data processing techniques are discussed.It includes the method to become greater data amount of lower angle region and the data must be extrapolated to hole special for the data from experiment,a sample is analyzed. 相似文献
8.
A data warehouse (DW) is taken as a set of materialized views defined over base relations. It is dynamic entity that evolves continually over time .As time passes, new queries can be made into new views to be added to the DW. Data Warehouse is expressed as and/or dag can describe the relations between queries in DW preferably. Thus, the design of DW can simulate the problem of state space search, relevant exchange rule may define state exchange rule. It can achieve the dynamic design of DW by exchanging and predigesting of state space search. A dynamic design way is proposed to add the new views to the DW by an example. 相似文献
9.
Summary The development and use of a computer database specifically designed to be used to store data from a plant breeding programme on perennial ryegrass (Lolium perenne) is described. Setting up a database requires data analysis in order to establish a conceptual dat model and a conceptual processing data. Every model has been written with MERISE method. With the models, a database has been built using ORACLE relational database management system. It is tailored to meet our own requirements which may be common to other database users. 相似文献
10.
Production command system plays a more and more important role in the modern large scale production. Being limited to realizing technology tool,there is a lot loss in information that is very valuable in the production process.Even it is not stored to the real key data information used for reflecting production sate, therefore it is very difficult to command and dispatch the production correctly. Reconstruction platform related to real-time database is discussed. Taking the background of iron steel industry,based on the analyzing the function characteristic of real-time data requirement of real-time data platform,the paper is explored to the real-time database selecting strategy and so on. 相似文献
11.
The dynamic data exchange is the key to the realization of the collaborative design based on Internet. The features of data for collaborative design based on Internet are analyzed. The data transformation, the data transmission and the data transaction of collaborative design based on Internet are researched. The system configuration and organization mode of dynamic data exchange for collaborative design Internet-based are developed, in which, STEP serves as the product data exchange standard, and ORACLE is the kernel database of the system, so that each of the CAD systems can synchronously access the ORACLE database, share and exchange the design information. The STEP-ORACLE serves as the organizing mode of dynamic data exchange for the collaborative design based on Internet, which realizes the real-time exchange and consistency of the dynamic data between the different platforms and CAD systems. 相似文献
12.
本体是一种能够有效提高农作物种质资源整合、共享和利用效率的组织方式。在分析传统本体构建方法的基础上,结合中国农作物种质资源自身的特点,提出结构化数据与非结构化数据相结合的半自动化本体构建方法。该方法首先基于面向对象的思想从关系数据库中抽取概念及其关系建立初始本体;然后从非结构化的网站数据中提取概念,并利用在线字典WordNet和网络百科全书Wikipedia丰富概念的语义,完善初始本体。使用本体构建工具Protégé构建了农作物种质资源本体模型。实验表明,该方法既充分利用了数据库中的资源,又考虑了非结构化数据的补充作用,减少了构建成本,本体更加完善。探讨了本体进化的途径,指出了本研究的优点和局限性。 相似文献
13.
The consistency of view maintenance and drill-down at the warehouse span multiple sources is studied. So the wide strongly consistent algorithm M-Glide is introduced, which imposes an action list to record the updating sequel sets, and uses version control and compensating mechanisms, along with acknowledgementmechanisms, to synchronize the data refreshments between data sources and data warehouse. The authors illustrate the application of the algorithm by a typical example. 相似文献
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为方便资料用户准确地把握霍尔果斯站的气候资料信息,进而揭示真实的气候变化特征与规律,选取霍城和伊宁县作为参考站,利用霍尔果斯站和参考站1961—2014年的同期观测资料序列进行了完整性、区域一致性和均一性分析。发现,霍尔果斯站观测资料完整性好,但气温、降水、湿度和风速共4个要素的区域一致性均较差,并且均存在不连续点。同期对比观测资料分析结果表明,相对湿度、降水量和风速一致性较好,气温和风向一致性比较差。显著性检验结果表明,新址和旧址除年、月平均风速差异显著,不能连续使用外,其他5个要素基本通过了显著性检验,资料可以连续使用。而风速在资料服务中需要进行订正,方可连续使用。 相似文献
16.
Based on an existing magnesium alloy database, a query system is optimized by considering the design characteristics, and an integrated query system for this magnesium alloy database is developed to meet the demands of more users. The result shows that the new system improves the query efficiency of the magnesium alloy database, especially for queries concerning phase diagrams and the structure of magnesium alloys. This means that the new system provides users a more powerful and useful magnesium alloy database. 相似文献
17.
The framework of "ITS Virtual Common Information Platform"is introduced,which integrates and shares of data between ITS subsystems by integrating distributed storage and centralized control of data.The distributed data(access) engine of the platform is designed and implemented.Based on the distributed data access engine,the flow of data providing and accessing is addressed in detail.In the end a typical application of the distributed data access engine is presented. 相似文献
18.
基于本体推理和数据挖掘的良好农业规范专家系统 总被引：1，自引：0，他引：1
针对良好农业规范(good agricultural practices,GAP)标准内容复杂,不易被农业生产者准确使用的问题,将本体推理和数据挖掘技术相结合,构建了良好农业规范专家系统,实现标准知识查询和GAP控制点推荐等功能,更好的帮助生产者理解和使用GAP。系统构建过程中,采用本体知识表示方法构建GAP标准知识库,通过解析“良好农业规范生产和认证信息服务平台”的GAP电子检查表记录,对挖掘过程中涉及的关联规则算法进行分析和改进,挖掘分析了用户对控制点使用的偏好。设计了控制点评价模型,实现了GAP控制点的择优推荐。系统基于MVC模式,设计为3层体系架构。通过测试应用,用户能够准确和容易的使用GAP标准。 相似文献
19.
Rough sets is widely applied to dealing with the information under uncertainty. The data mining technology based on the rough sets is being increasingly attached importance by mathematicians and computer scientists. This paper introduces the development process and basic characteristics of rough sets, the application of rough sets theory to the data mining, and the typical system of the data mining based on the rough sets, as well as the directions and fields for future researches. Finally, this paper discusses the necessities through combining rough sets theory and intelligent methods to process information. 相似文献
20.
试验设计与数据处理课程教学改革初探 总被引：1，自引：0，他引：1
针对试验设计与数据处理课程教学中存在的问题,结合教学实践,从教学方法、教学手段、培养学生解决实际问题能力和改革考核方式4个方面,探讨了课程改革的方法和途径。 相似文献