The purpose of a database standard is reviewed and proposed items to be considered in the standardization of an objectoriented DBMS are identified. The features of an OODBMS that address these items are described. Th...
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The purpose of a database standard is reviewed and proposed items to be considered in the standardization of an objectoriented DBMS are identified. The features of an OODBMS that address these items are described. They include: object model, processing model, object specification, information management, consistency and security.
Today, advances in personal computing are helping corporations compete in a dynamic, global economy. Businesses, however, need new ways to deliver information systems in a faster, more cost-effective manner. object te...
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Today, advances in personal computing are helping corporations compete in a dynamic, global economy. Businesses, however, need new ways to deliver information systems in a faster, more cost-effective manner. object technology, in the form of COM will help businesses meet these needs. This article presents GDES for client/server computing based on OLE and objectBroker. GDES is a huge step forward in UBS's client/server computing strategy. It serves as a blueprint for future UBS applications where information is stored on a variety of dissimilar computers and databases.
The Self programming language, which distills object-oriented computation down to a simple story based on copying prototypes to create objects, inheriting from objects to share their contents, and passing messages to ...
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The Self programming language, which distills object-oriented computation down to a simple story based on copying prototypes to create objects, inheriting from objects to share their contents, and passing messages to invoke methods, is discussed. It is shown that Self's uniform application of the object-message paradigm gives programmers unusual flexibility. Unconventional optimizations can bring its peak performance to within a factor of two of optimized C's performance. Overviews of Self and its message passing performance are presented
Software engineers are always looking for ways to improve modularity in software. Doing so makes software easier to develop and maintain and improves its overall quality. Recently, aspect-orientedprogramming emerged ...
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Software engineers are always looking for ways to improve modularity in software. Doing so makes software easier to develop and maintain and improves its overall quality. Recently, aspect-orientedprogramming emerged as a new modularity technique that aims to cleanly separate the implementation of crosscutting concerns (requirements and design elements that affect multiple modules). AOP is an evolutionary step that improves the implementation\'s comprehensibility and simplifies incorporating new requirements as well as changes to existing ones. This systematic approach promises direct mapping of requirements and design intentions to the implementation. Such a mapping lets you trace the reasoning behind a piece of code\'s existence. Efficiently implementing crosscutting concerns also has an important indirect benefit: it frees resources to concentrate on the quality of the core implementation. All these factors work together to improve software quality.
GenASiS Basics provides Fortran 2003 classes furnishing extensible object-oriented utilitarian functionality for large-scale physics simulations on distributed memory supercomputers. This functionality includes physic...
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GenASiS Basics provides Fortran 2003 classes furnishing extensible object-oriented utilitarian functionality for large-scale physics simulations on distributed memory supercomputers. This functionality includes physical units and constants; display to the screen or standard output device; message passing; I/O to disk; and runtime parameter management and usage statistics. This revision - Version 3 of Basics - includes a significant name change, some minor additions to functionality, and a major addition to functionality: infrastructure facilitating the offloading of computational kernels to devices such as *** version program summary Program Title: SineWaveAdvection, SawtoothWaveAdvection, and RiemannProblem (fluid dynamics example problems illustrating GenASiS Basics); ArgonEquilibrium and ClusterFormation (molecular dynamics example problems illustrating GenASiS Basics)Program Files doi: http://***/10.17632/6w9ygpygmc.2Licensing provisions: GPLv3programming language: Fortran 2003 (tested with GNU Compiler Collection 8.1.0, Intel Fortran Compiler 18.0.3, Cray Compiler Environment 8.6.5, IBM XL Fortran 16.1.0)Journal reference of previous version: Computer Physics Communications 214 (2017) 247Does the new version supersede the previous version?: YesReasons for the new version: This version includes a significant name change, some minor additions to functionality, and a major addition to functionality: infrastructure facilitating the offloading of computational kernels to devices such as *** of revisions:The class VariableGroupForm - a major workhorse for handling set of related fields - has been renamed *** ability to use unicode characters in standard output has been added, but is currently only supported by the GNU Compiler Collection (GCC). This capability is used to display exponents as numerical superscripts, as well as symbols such as ħ, ⊙, and Å in the display of relevant units. It is made operational by the line Download high
All systems that undergo frequent change characteristically tend toward disorder. This is known as entropy and is recognized in all branches of science. Class hierarchies are shared structures which, if useful, underg...
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All systems that undergo frequent change characteristically tend toward disorder. This is known as entropy and is recognized in all branches of science. Class hierarchies are shared structures which, if useful, undergo frequent change in the form of additional subclassing, modification to existing classes, and sometimes the restructuring of the hierarchy itself. Given this frequent change, we can expect class hierarchies to exhibit entropic tendencies, which we term conceptual entropy. Conceptual entropy is manifested by increasing conceptual inconsistency as we travel down the hierarchy. That is, the deeper the level of the hierarchy, the greater the probability that a subclass will not consistently extend and/or specialize the concept of its superclass. Constructing and maintaining consistent class hierarchies is one of the most difficult activities of object-oriented design. The article describes an automated classification tool that helps minimize conceptual entropy
Static typechecking is an important feature of many standard programming languages. However, static typing focuses on data rather than communication, and therefore does not help programmers correctly implement communi...
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Static typechecking is an important feature of many standard programming languages. However, static typing focuses on data rather than communication, and therefore does not help programmers correctly implement communication protocols in distributed systems. The theory of session types provides a basis for tackling this problem;we use it to develop two tools that support static typechecking of communication protocols in Java. The first tool, Mungo, extends Java with typestate definitions, which allow classes to be associated with state machines defining permitted sequences of method calls: for example, communication methods. The second tool, StMungo, takes a session type describing a communication protocol, and generates a typestate specification of the permitted sequences of messages in the protocol. Protocol implementations can be validated by Mungo against their typestate definitions and then compiled with a standard Java compiler. The result is a toolchain for static typechecking of communication protocols in Java. We formalise and prove soundness of the typestate inference system used by Mungo, and show that our toolchain can be used to typecheck a client for the standard Simple Mail Transfer Protocol (SMTP). (C) 2017 The Author(s). Published by Elsevier B.V.
Statistical environments such as S, R, XLisp-Stat, and others have had a dramatic effect on the way we, statistics practitioners, think about data and statistical methodology. However, the possibilities and challenges...
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Statistical environments such as S, R, XLisp-Stat, and others have had a dramatic effect on the way we, statistics practitioners, think about data and statistical methodology. However, the possibilities and challenges introduced by recent technological developments and the general ways we use computing conflict with the computational model of these systems. This article explores some of these challenges and identifies the need to support easy integration of functionality from other domains, and to export statistical methodology to other audiences and applications, both statically and dynamically. Existing systems can be improved in these domains with some already implemented extensions (see Section 5). However, the development of a new environment and computational model that exploits modern tools designed to handle many general aspects of these challenges appears more promising as a long-term approach. We present the architecture for such a new model named Omegahat. It lends itself to entirely new statistical computing paradigms. It is highly extensible at both the user and programmer level, and also encourages the development of new environments for different user groups. The Omegahat interactive language offers a continuity between the different programming tasks and levels via optional type checking and seamless access between the interpreted user language and the implementation language, Java. Parallel and distributed computing, network and database access, interactive graphics, and many other aspects of statistical computing are directly accessible to the user as a consequence of this seamless access. We describe the benefits of using Java as the implementation language for the environment and several innovative features of the user-level language which promise to assist development of software that can be used in many contexts. We also outline how this architecture can be integrated with existing environments such as R and S. The ideas are drawn from work wit
Domain-independent information systems like ontology editors provide only limited usability for non-experts when domain-specific linked data need to be created. On the contrary, domain-specific applications require ad...
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Domain-independent information systems like ontology editors provide only limited usability for non-experts when domain-specific linked data need to be created. On the contrary, domain-specific applications require adequate architecture for data authoring and validation, typically using the object-oriented paradigm. So far, several software libraries mapping the RDF model (representing linked data) to the object model have been introduced in the literature. In this paper, we develop a novel framework for comparison of object-triple mapping solutions in terms of features and performance. For feature comparison, we designed a set of qualitative criteria reflecting object-oriented application developer's needs. For the performance comparison, we introduce a benchmark based on a real-world information system that we implemented using one of the compared object-triple mapping (OTM) solutions - JOPA. We present a detailed evaluation of a selected set of OTM libraries, showing how they differ in terms of features. We further narrow down the set of selected OTM libraries to contain only RDF4J-compatible ones and use the benchmark to measure their time and memory efficiency.
The electronic Ligand Builder and Optimization Workbench (eLBOW) is a program module of the PHENIX suite of computational crystallographic software. It is designed to be a flexible procedure that uses simple and fast ...
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The electronic Ligand Builder and Optimization Workbench (eLBOW) is a program module of the PHENIX suite of computational crystallographic software. It is designed to be a flexible procedure that uses simple and fast quantum-chemical techniques to provide chemically accurate information for novel and known ligands alike. A variety of input formats and options allow the attainment of a number of diverse goals including geometry optimization and generation of restraints.
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