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检索条件"主题词=Object oriented databases"

共 1565 条记录，以下是51-60 订阅

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Metadata oriented Software Development Method

Metadata Oriented Software Development Method

引用

International Conference on BioMedical Engineering and Informatics (BMEI)

作者： Yiping Jiang Lianzhong Liu Wei Lv Chilong Zhao College of Information Technology Beijing Normal University Zhuhai China College of Information Technology and Computer Science Anhui Agricultural University Hefei China

ISBN: (纸本)9781424441327

By summarizing the software development experience and the research on the software methodology, the paper presented a metadata oriented software development method. The practice of this method in the real world software development had been discussed. Meanwhile we compared this method with other methods and pointed out that these methods are interrelated and indivisible. These methods should be used together in software development to facilitate the success of the development.

关键词： Programming object oriented modeling Educational institutions Information technology Software engineering Relational databases object oriented databases Algorithm design and analysis Software reusability Management information systems

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Publisher-subscriber: An agent system for notification of versions in OODBs

Publisher-subscriber: An agent system for notification of ve...

引用

International Conference on Intelligent Agent & Multi-Agent Systems (IAMA)

作者： K. Palanivel V. Amouda S. Kuppuswami Computer Centre Pondicherry University Pondicherry India Department of Banking Technology Pondicherry University Pondicherry India Department of Computer Science Pondicherry University Pondicherry India

In object-oriented databases, the conceptual structure may not be constant and may vary due to variety of reasons like correcting mistakes, adding/removing features, updating database, etc. Class versioning is one the evolution strategy that addresses the above issues. However, class versioning may be yields some unexpected results to the database clients. The easiest method is to just set a cache to expire periodically depending on the types of data. This solution is approximation and tends to either refresh too often so that the data is unnecessarily sent over the network or not often enough so that the data becomes stale. Query notification is the solution to avoid frequent access to the database and hence proposed to design agent system for monitoring class versioning. agent technology has generated lots of excitement in recent years because of its promise as a new paradigm for conceptualizing, designing and implementing software systems. Software agents coordinate the application that run on databases and allows performing the sequence of events like flushing cache, database operations, monitoring, etc. This agent system consists of a publisher agent, subscriber agents and a database update agent. These agents monitor the database for any change that would change data the data in the query or its structure. When it detects such a change, the publisher agent generates a change notification message and subscriber agent subscribes the notification message. To implement this system, a database application was developed with two versions and applied the database change notifications. To promote more reusability and scalability, a publisher-subscriber pattern was integrated with this application.

关键词： Spatial databases object oriented databases Monitoring Software agents Application software object oriented modeling Banking Computer science Software design Software systems

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Research for object-oriented Billing

Research for Object-Oriented Billing

引用

Computer Science and Information Engineering, CSIE, WRI World Congress on FLAGGED

作者： Bo Hu Marketing Department of Liaoning Province Northeast Dianli University China

This paper dealt with research for key technologies of electric quantity and billing based on trial standard C++. Special emphasis was put on used open libraries, such as standard library, Boost library and Oralib library; it also discussed common design errors with the use of C++ and correct design philosophy, detailed key technologies applied in billing, for instance, the application of data access framework and handle, etc.

关键词： Software libraries Power engineering and energy Power supplies Logic object oriented modeling object oriented databases Computer languages Programming profession Computer science Cities and towns

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Research on Track Map Database for Low-Cost Train Control System

Research on Track Map Database for Low-Cost Train Control Sy...

引用

International Conference on Information Science and Engineering (ICISE)

作者： Bai-gen Cai Jiang Liu Jian Wang ShangGuan Wei State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China

The low-cost train control system is new trend for modern train operation and management. Based on the functional requirement of track map database, generation of track map in GIS and schematic form are mainly studied in this paper, as well as their mapping description. In the low-cost scheme, the flow of the generation is discussed in detailed and several strategies are employed to realize the mapping of GIS and schematic track. With the generating software developed in this work, the generated track map database is validated in the simulation environment and the correction and effectiveness are guaranteed.

关键词： Control systems Geographic Information Systems Rail transportation Communication system control Railway safety object oriented databases Costs object oriented modeling Global Positioning System Railway engineering

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GML Database Based on Oracle XML DB

GML Database Based on Oracle XML DB

引用

International Conference on Information Engineering and Computer Science (ICIECS)

作者： Xiaoji Lan Jintong Ren Jinbao Cai Sch. of Archit. & Surveying & Mapping Eng. Jiangxi Univ. of Sci. & Technol. Ganzhou China Sch. of Foreign Language & Int. Trade Jiangxi Univ. of Sci. & Technol. Ganzhou China

Based on the study of XML documents storage in Oracle XML DB, this paper conducts a research on extending Oracle XML DB to store and manage GML documents. Meanwhile, owing to the defects that the XML DB cannot support the spatial index, an external R-Tree index is added to Oracle database to improve the efficiency of GML spatial query and operation. At the same time, with the help of NTS as well as with Oracle's own support XQuery, the spatial extension to XQuery in Oracle is proposed and implemented. Through the research of this paper, we provide a solution of GML database for GML storage, index and query.

关键词： XML Spatial databases Technology management object oriented databases Relational databases Database languages Web services Spatial indexes Encoding Spatial resolution

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Software Flexibility Improvement for Document oriented Applications

Software Flexibility Improvement for Document Oriented Appli...

引用

IEEE International Conference on Intelligent Engineering Systems (INES)

作者： V. Stoicu-Tivadar L. Stoicu-Tivadar Department of Automation and Applied Informatics Politehnica University Timisoara Romania

The paper describes new techniques to increase flexibility for document-oriented software using appropriate database structures, templates and/or XML files. This approach gives an opportunity to the developer to add an arbitrary document by request, each time when this is needed. The described principle makes the adding of a new document easier, avoiding to modify the structure of the database or deploy a new executable when a new form and a corresponding new document is needed in the system. An easy-to-use procedure is completely defined based on two case studies. Expected results are discussed.

关键词： Application software Cities and towns Environmental economics XML Programming Instruments Web server object oriented databases Automation Informatics

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Researches on Geographic Data Storage and Management Based on object-oriented Storage in the Distributed Software Architecture

Researches on Geographic Data Storage and Management Based o...

引用

WRI World Congress on Software Engineering, WCSE

作者： Haiguo Zhu Quanyi Huang Jiming Guo Shaobo Zhong School of Geodesy and Geomatics Wuhan University of China Wuhan China Center of Public Safety Research Tsinghua University Beijing China

The development of Earth information science breaks through the category of traditional Geographic Information System (GIS), it is an inevitable trend that making an improvement on the storage and management of geographic data. Geographic data possess some features such as massive, complicated data structure, intensive operation and strong autocorrelation which make the storage and management of geographic data different from other type data. The current solutions which add a middleware on commercial DBMS to realize the middle conversion of geographic data is complex inefficient and unscalable. This paper presents a distributed geographic data storage and management architecture called as DGOSM for geographic object based on object- oriented storage, providing a new solution to storage and management of geographic data. DGOSM extends the idea of object-oriented storage and according to the object-oriented database standard ODMG3.0 which was proposed in 2000 by ODMG organization, to repartition the function of database server and storage devices. And the DGOSM support the object-oriented geographic data model on the logical layer to simplify the map of geographic data model and the parallel spatial query to improve the efficiency of geographic data query. In DGOSM, object-oriented storage opens the way for pushing more intelligence into the storage device. When geographic data is stored as geographic object, devices can learn about the behavior of the applications and use the information for improving the service they provided in the distributed software architecture.

关键词： Memory Software architecture Geographic Information Systems object oriented databases Spatial databases Data models Geoscience Information science Data structures Autocorrelation

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Study on Arch Dam Visual Modeling System Based on CATIA

Study on Arch Dam Visual Modeling System Based on CATIA

引用

International Conference on Environmental Science and Information Application Technology, ESIAT

作者： Ping Jin School of Urban Study Wuhan University Wuhan Hubei China

The paper bases on the idea of parametric modeling, used object-oriented technology, combined the parametric design and knowledge engineer system, to develop arch dam visual modeling system. System bases on CATIA V5 platform, to VB as a secondary development tools, utilizes database technology to support data exchange between the module and processing. Users through an interactive design parameters input, uses the system function to complete parametric modeling of arch dam, transverse joints division of arch dam, arch dam construction parameters extraction and engineering drawings automatically generated in line with the requirements of the design. It has certain practical value for Hydraulic Engineering.

关键词： object oriented modeling Parametric statistics Paper technology Design engineering Knowledge engineering Systems engineering and theory object oriented databases Visual databases Parameter extraction Engineering drawings

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How to Model a Real-Time Database?

How to Model a Real-Time Database?

引用

International Symposium on object-oriented Real-Time Distributed Computing

作者： Nizar Idoudi Claude Duvallet Rafik Bouaziz Bruno Sadeg Faiez Gargouri UFR des Sciences et des Techniques Le Havre France MIRACL-ISIMS Sfax Tunisia

ISBN: (纸本)9781424435715

This paper presents a framework for real-time database design that is able to support real-time database requirements such as time-constrained data and time-constrained transactions. It is based upon a real-time object-oriented data model in which each object encapsulates time-constrained data, time-constrained methods and concurrency control mechanisms. Our framework is composed of an UML profile for real-time database, a translator to object-relational model, and an UML CASE Tool.

关键词： Transaction databases Unified modeling language object oriented databases Real time systems Spatial databases Timing object oriented modeling Concurrency control Data models Process control

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Transaction Processing in Mobile Computing Using Semantic Properties

Transaction Processing in Mobile Computing Using Semantic Pr...

引用

International Conference on Advances in databases, Knowledge, and Data Applications, DBKDA

作者： Fritz Laux Tim Lessner Fakultät Informatik Reutlingen University Reutlingen Germany School of Computing University of the West of Scotland Paisley UK

Transaction processing is of growing importance for mobile computing. Booking tickets, flight reservation, banking, ePayment, and booking holiday arrangements are just a few examples for mobile transactions. Due to temporarily disconnected situations the synchronisation and consistent transaction processing are key issues. Serializability is a too strong criteria for correctness when the semantics of a transaction is known. We introduce a transaction model that allows higher concurrency for a certain class of transactions defined by its semantic. The transaction results arerdquoescrow serializablerdquo and the synchronisation mechanism is non-blocking. Experimental implementation showed higher concurrency, transaction throughput, and less resources used than common locking or optimistic protocols.

关键词： Mobile computing Transaction databases Concurrent computing Mobile communication Protocols Service oriented architecture object oriented databases Middleware Banking Throughput

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