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Writing Analytic Element Programs in Python

GROUND WATER 2009年第6期47卷 828-834页

作者： Bakker, Mark Kelson, Victor A. Delft Univ Technol Water Resources Sect Fac Civil Engn & Geosci NL-2628 CN Delft Netherlands WHPA Inc Bloomington IN 47404 USA KWR Watercycle Res Inst NL-3433 PE Nieuwegein Netherlands

The analytic element method is a mesh-free approach for modeling ground water flow at both the local and the regional scale. With the advent of the Python object-oriented programming language, it has become relatively easy to write analytic element programs. In this article, an introduction is given of the basic principles of the analytic element method and of the Python programming language. A simple, yet flexible, object-oriented design is presented for analytic element codes using multiple inheritance. New types of analytic elements may be added without the need for any changes in the existing part of the code. The presented code may be used to model flow to wells (with either a specified discharge or drawdown) and streams (with a specified head). The code may be extended by any hydrogeologist with a healthy appetite for writing computer code to solve more complicated ground water flow problems.

关键词： PYTHON (Computer program language) GROUNDWATER CIPHERS MALWARE (Computer software) PROGRAMMING languages (Electronic computers) object-oriented databases HYDROGEOLOGISTS

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Database Virtualization Technology in Ubiquitous Computing

Database Virtualization Technology in Ubiquitous Computing

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International Conference on Innovations in Information Technology

作者： Wada, Yuji Sawamoto, Jun Watanabe, Yuta Katoh, Takashi Tokyo Denki Univ Dept Informat Environm Tokyo Japan Iwate Prefectural Univ Fac Software & Informat Sci Kyoto Japan Tokyo Denki Univ Dept Informat Environm Tokyo Japan

ISBN: (纸本)9781424456987

In this paper, our research objective is to develop a database virtualization technique so that data analysts or other users who apply data mining methods to their jobs can use all ubiquitous databases in the Internet as if they were recognized as a single database, thereby helping to reduce their workloads such as data collection from the databases and data cleansing works. In this study, firstly we examine XML scheme advantages and propose a database virtualization method by which such ubiquitous databases as relational databases, object-oriented databases, and XML databases are useful, as if they all behaved as a single database. Next, we show the method of virtualization of ubiquitous databases can describe ubiquitous database schema in a unified fashion using the XML schema. Moreover, it consists of a high-level concept of distributed database management of the same type and of different types, and also of a location transparency feature.

关键词： object-oriented databases

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Optimal design of object-oriented databases in automatic information-control systems. II. Models and methods of design of optimal logical structures for object-oriented databases

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AUTOMATION AND REMOTE CONTROL 2005年第10期66卷 1690-1700页

作者： Kul'ba, VV Sirotyuk, VO Russian Acad Sci Trapeznikov Inst Control Sci Moscow Russia Eurasian Patent Agcy Moscow Russia

Part II is devoted to the formulation of the problem and models and methods of design of optimal logical structures for object-oriented databases used in designing automatic information control systems. The effectiveness criteria used for the problem design are defined by the minimal total time of utilization of databases and service of a given set of user inquires and transactions, minimal total time of implementation of a set of inquires and transactions over the database. Design problems are formulated as nonlinear integer programming problems and effective exact and heuristic algorithms are developed to solve them.

关键词： INFORMATION storage & retrieval systems ELECTRONIC information resources object-oriented databases databases object-oriented methods (Computer science) INTEGER programming NONLINEAR programming

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Views as first-class citizens in object-oriented databases

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VLDB JOURNAL 2005年第2期14卷 155-169页

作者： Alhajj, R Polat, F Yilmaz, C Univ Calgary Dept Comp Sci Calgary AB T2N 1N4 Canada Middle E Tech Univ Dept Comp Engn TR-06531 Ankara Turkey

Extensibility and dynamic schema evolution are among the attractive features that lead to the wide acceptance of the object-oriented paradigm. Not knowing all class hierarchy details should not prevent a user from introducing new classes when necessary. Naive or professional users may define new classes either by using class definition constructs or as views. However, improper placement of such classes leads to a flat hierarchy with many things duplicated. To overcome this problem, we automated the process in order to help the user find the most appropriate position with respect to her class in the hierarchy regardless of her knowledge of the hierarchy. The system must be responsible for the proper placement of new classes because only the system has complete knowledge of the details of the class hierarchy, especially in a dynamic environment where changes are very frequent. In other published work, we proved that to define a view it is enough to have the set of objects that qualify to be in a view in addition to having message expressions (possible paths) that lead to desired values within those objects. Here, we go further to map a view that is intended to be persistent into a class. Then we investigate the proper position of that class in the hierarchy. To achieve this, we consider current characteristics of a new class in order to derive its relationship with other existing classes in the hierarchy. Another advantage of the presented model is that views that generate new objects are still updatable simply because we based the creation of new objects on existing identities. In other words, an object participates inside view objects by its identity regardless of which particular values from that object are of interest to the view. Values are reachable via message expressions, not violating encapsulation. This way, actual values are present in only one place and can be updated.

关键词： class hierarchy object-oriented databases reusability schema evolution views

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Heteroscedastic Probabilistic Linear Discriminant Analysis with Semi-supervised Extension

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Joint European Conference on Machine Learning (ECML)/European Conference on Principles and Practice of Knowledge Discovery in databases (PKDD)

作者： Zhang, Yu Yeung, Dit-Yan Hong Kong Univ Sci & Technol Hong Kong Peoples R China

ISBN: (纸本)9783642041730

Linear discriminant analysis (LDA) is a commonly used method for dimensionality reduction. Despite its successes, it has limitations under some situations, including the small sample size problem, the homoscedasticity assumption that different classes have the same Gaussian distribution, and its inability to produce probabilistic output and handle missing data. In this paper. we propose a semi-supervised and heteroscedastic extension of probabilistic LDA, called S(2)HPLDA, which aims at overcoming all these limitations under a common principled framework. Moreover, we apply automatic relevance determination to determine the required dimensionality of the low-dimensional space for dimensionality reduction. We empirically compare our method with several related probabilistic subspace methods on some face and object databases. Very promising results are obtained from the experiments showing the effectiveness of our proposed method.

关键词： object-oriented databases

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An object oriented intelligent environment for ERP systems

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BUSINESS PROCESS MANAGEMENT JOURNAL 2009年第1期15卷 109-118页

作者： Subramoniam, Suresh Tounsi, Mohamed Prince Sultan Univ Coll Business Adm Riyadh Saudi Arabia Prince Sultan Univ Coll Comp & Informat Sci Riyadh Saudi Arabia

Purpose - The purpose of this paper is to demonstrate object-oriented (OO) features in a language, suitable for artificial intelligence (AI), which will execute in a web environment. Earlier researchers have claimed that such a possibility will pave the way for better enterprise systems of tomorrow. Design/methodology/approach - In this paper, the key OO features, inheritance and polymorphism, are presented using suitable examples. Visual Prologe is the language used to demonstrate the examples and the same executes in web environment. Findings - This premise definitely matches the fundamental rethinking and radical redesign of existing systems which can aptly be called business process reengineering (BPR) in this field of study. A monolithic/homogeneous expert database design based system supporting AI and OO capabilities which executes in web environment is the result of this study. Research limitations/implications - There is no argument about the optimality of the search which is carried out while using this environment, which is purely based on the computer language used. Practical implications - The power of similar environment has enormous potential in developing better enterprise systems of tomorrow. This declarative environment helps enterprise resource planning (ERP) evolve faster towards strategic decision making rather than remaining as transaction processing systems. Originality/value - It is hoped that this paper will inspire other researchers in the field of BPR of existing ERP systems.

关键词： object-oriented databases Artificial intelligence object-oriented languages Manufacturing resource planning

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Reasoning in Pervasive Environments: an Implementation of Concept Abduction with Mobile OODBMS

Reasoning in Pervasive Environments: an Implementation of Co...

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IEEE/WIC/ACM International Conferences on Web Intelligence (WI)/Intelligent Agent Technologies (IAT),

作者： Ruta, Michele Scioscia, Floriano Di Noia, Tommaso Di Sciascio, Eugenio Politecn Bari I-70125 Bari Italy

ISBN: (纸本)9781424453313

The paper focuses on an implementation of concept abduction with an object-oriented Database Management System (OODBMS). OWL-DL Knowledge Bases have been translated to an OO version to enable standard and nonstandard inference services as queries over a DB suitable for handheld devices. The framework has been implemented and tested: early experiments are reported.

关键词： object-oriented databases

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An object-oriented multi-scale retrieval method for educational image resources

An object-oriented multi-scale retrieval method for educatio...

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2009 International Workshop on Intelligent Systems and Applications, ISA 2009

作者： XiTang, Shi Zhou, Caigen Qin, Haiou Information Science and Technology College YanCheng Teachers University YanCheng JiangSu 224002 China

ISBN: (纸本)9781424438945

The paper gives the object-oriented multi-scale retrieval theory for educational image resources. (1) from the actual needs of education and teaching, analyzing the object-oriented features of image for educational resources;(2) descriptors for image of educational resources are systematically presented according to the object-oriented features of image for educational resources, which have nothing to do with their size, location and direction;(3) the object-oriented multi-scale retrieval method for image of educational resource is raised based on multi-scale segmentation;(4) a platform of object-oriented multi-scale retrieval for image of educational resource is implemented based on the object-oriented database. © 2009 IEEE.

关键词： object-oriented databases

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Mapping technique of STEP data model in relational database based on data storage

Mapping technique of STEP data model in relational database ...

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2nd International Conference on Intelligent Networks and Intelligent Systems, ICINIS 2009

作者： Wei, Qun Duan, Guolin Cai, Jin Zhou, Guixia School of Mechanical Engineering Hebei University of Technology Tianjin China School of Math and Physics Hebei Polytechnic University Tangshan Hebei China

ISBN: (纸本)9780769538525

STEP is the most effective way to describe product data model. But object-oriented database in the implementation of STEP schema can not be directly integrated with the manufacturing information management system based on relational database system. So it needs to transform the product data model to relational data model. This paper deals with the mapping technique for different data types in STEP. First a data dictionary needs to be established, which is used to look up the definition of entity and relations of the operation data and to make the corresponding Data Manipulation Language (DML) statements execute. Then the mapping rule of EXPRESS data style to relational database, including basic data type, object data type and inheritance, is described. Finally an entity instance manager based on data storage is provided to realize the persistency of STEP data in relational database. The mapping technique discussed in this paper can be used in all STEP data schemas. © 2009 IEEE.

关键词： object-oriented databases

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Generic approach to automatic index updating in OODBMS

Generic approach to automatic index updating in OODBMS

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ICEIS 2009 - 11th International Conference on Enterprise Information Systems

作者： Kowalski, Tomasz M. Kuliberda, Kamil Wiślicki, Jacek Adamus, Radoslaw Technical University of Lodz Stefanowskiego 18/22 90-924 Lodz Poland

ISBN: (纸本)9789898111845

In this paper, we describe a robust approach to the problem of the automatic index updating, i.e. maintaining cohesion between data and indices. Introducing object-oriented notions (classes, inheritance, polymorphism, class methods, etc.) in databases allows defining more complex selection predicates;nevertheless, in order to facilitate selection process through indices, index updating requires substantial revising. Inadequate index maintenance can lead to serious errors in query processing what has been shown on the example of Oracle 11g ORDBMS. The authors work is based on the Stack-Based Architecture (SBA) and has been implemented and tested in the ODRA (object Database for Rapid Applications development) OODBMS prototype.

关键词： object-oriented databases

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