Current data abstraction mechanisms are not adequate to control sharing of state in the general case involving objects in linked structures. The pervading possibility of sharing is a source of errors and an obstacle t...
详细信息
Organizations with legacy database systems are seeking solutions to re-engineer their existing relational databases to object-oriented databases for better maintainability and evolutionary ability. I. Kwan has propose...
详细信息
Organizations with legacy database systems are seeking solutions to re-engineer their existing relational databases to object-oriented databases for better maintainability and evolutionary ability. I. Kwan has proposed a complete methodology to transform relational schema to object-oriented schema, using DataReverse Engineering to extract the structural semantics and a Hybrid approach to recover dynamic semantics from Data Flow Diagrams and Data Dictionary. This paper presents the result of applying Kwan's methodology to a College system, of which the relational database schema is successfully transformed to object-oriented database schema with both structural and dynamic semantics. This paper has proved that the hybrid approach in recovering dynamic semantics from Data Flow Diagrams is feasible, simple and cost-effective.
A new approach to automated interwell log correlation using both artificial intelligence (AI) and multivariate statistical analysis is described. Correlation of wireline logging data is on the basis of a large set of ...
详细信息
ISBN:
(纸本)9781555633660
A new approach to automated interwell log correlation using both artificial intelligence (AI) and multivariate statistical analysis is described. Correlation of wireline logging data is on the basis of a large set of subjective rules for pattern recognition that is intended to represent human logical processes. The data processed are the characteristics of the shapes extracted along log traces by object-orientedprogramming (OOP). Correlation of zones between wells is made by rule-based inference program. This method has the advantage over the conventional methods due to the capability of handling the shifting, thickening, and thinning strata in interwell correlation. Use of statistical techniques can obtain more reliable correlation results for complex geologic formation. The efficient and reliable pattern recognition for correlation can be established by using the first principal component log, since it has the largest common part of variance of all available well-log data. In addition, the electrofacies derived by selecting, weighting, and combing the multivariate well-logs can be used as an important information of lithology identification for more reliable correlation. Correlated results with logging data in the Korea Continental Shelf and oversea field show that this method can be used to make it more reliable and efficient to interwell log correlation rather than the traditional methods in which only one approach was adopted. It can be applied as an effective tool in planning the development and production strategy of the field. Copyright 1999, Society of Petroleum Engineers Inc.
Taylor Enterprise Dynamics (Taylor ED) is an object-oriented software system used to model, simulate, visualize, and monitor dynamic-flow process activities and systems. This article describes how Taylor ED is used an...
详细信息
ISBN:
(纸本)9780780357808
Taylor Enterprise Dynamics (Taylor ED) is an object-oriented software system used to model, simulate, visualize, and monitor dynamic-flow process activities and systems. This article describes how Taylor ED is used and its benefits to modeling, simulating, visualizing, and monitoring process flow activities.
Real-time garbage collection is essential if object-oriented languages (in particular, Java) are to become predictable enough for real-time embedded systems. Although techniques for hard real-time garbage collection e...
详细信息
The addition of object-oriented features to Ada has left a disconnection between the object-oriented paradigm and the intertask communication and synchronisation paradigms. The lack pf extensibility of tasks and prote...
详细信息
Advanced mobile robots have to cope with many different situations and have to fulfil their tasks even in dynamic environments. Furthermore, there is an increasing demand that those systems perform not only a single t...
详细信息
Ada95 is an object-oriented concurrent programming language. PDEFA is a distributed Ada95 system. In PDEFA, task and protected objects in Ada95 are turned into independent and service objects respectively, and run und...
详细信息
Threads have been present in programming languages for some time now. However, they have a bad image among software developers because they lead to unreliable applications. Most of the problems are produced by unexpec...
详细信息
This paper describes the design of a software representation for music scores. It is intended for use in building algorithms for processing scores. The focus is on representing scores that originate in, or that are ge...
详细信息
This paper describes the design of a software representation for music scores. It is intended for use in building algorithms for processing scores. The focus is on representing scores that originate in, or that are generated in common practice notation. Common Practice Notation facilitates the composition, storage, performance and transmission of music. In western music it plays a central role in music literacy, in activities involving the visualisation of music and in music education. Computer-based representations are to be found in composition-oriented systems, in notationoriented systems, and in some of the standard or semi-standard file-based representations. Composition systems in general are not based on Common Practice Notation. They either ignore it altogether, or embed a simplified subset of it Most notation systems, on the other hand, have an internal representation that is not externally accessible. Another source of computer scores is found in the various file-based representations that come from corpora-oriented or from interchangeoriented systems or from notation systems. In all cases file-based representations have a level of complexity that gets in the way of their direct use for algorithm construction. The current approach is to provide a software environment that hides such complexity by using an object-oriented approach. The score object is represented in accordance with principles of objectivity and completeness. File-based representations can be converted into *** from a number of different file-based representations. Also *** score representations can be built algorithmically or interactively. The *** environment is designed for the development of algorithms that access, process and create music scores. Application areas include music analysis, performance, multimedia, music education, music corpora, information retrieval and browsing, and computer-assisted composition. The representational model consists of a Score class
暂无评论