Search results for "Data type"

showing 3 items of 1183 documents

Minimizing fleet operating costs for a container transportation company

2006

Abstract This paper focuses on a fleet management problem that arises in container trucking industry. From the container transportation company perspective, the present and future operating costs to minimize can be divided in three components: the routing costs, the resource (i.e., driver and truck) assignment costs and the container repositioning costs (i.e., the costs of restoring a given container fleet distribution over the serviced territory, as requested by the shippers that own the containers). This real-world problem has been modeled as an integer programming problem. The proposed solution approach is based on the decomposition of this problem in three simpler sub-problems associate…

transportationstochastic fleet managementInformation Systems and ManagementdecompositionGeneral Computer ScienceOperations researchComputer sciencebusiness.industryComputerApplications_COMPUTERSINOTHERSYSTEMSManagement Science and Operations ResearchIndustrial and Manufacturing EngineeringResource (project management)container truckingModeling and SimulationContainer (abstract data type)Decomposition (computer science)set covering problemRouting (electronic design automation)Container trucking; Decomposition; Set covering problem; Stochastic fleet management; TransportationbusinessInteger programmingtransportation; container trucking; stochastic fleet management; decomposition; set covering problemFleet management
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Error messages in relational database management systems: A comparison of effectiveness, usefulness, and user confidence

2021

Abstract The database and the database management system (DBMS) are two of the main components of any information system. Structured Query Language (SQL) is the most popular query language for retrieving data from the database, as well as for many other data management tasks. During system development and maintenance, software developers use a considerable amount of time to interpret compiler error messages. The quality of these error messages has been demonstrated to affect software development effectiveness, and correctly formulating queries and fixing them when needed is an important task for many software developers. In this study, we set out to investigate how participants ( N = 152 ) …

virhetilanteetSQLError messageComputer scienceData managementStructured query language (SQL)CompilerQuery languagecomputer.software_genrekyselykieletDatabase management systemSet (abstract data type)SoftwareRelational database management systemInformation systemtietokannatcomputer.programming_languageSQLInformation retrievalbusiness.industrySoftware developmenthallintajärjestelmätHardware and ArchitecturevirheetohjelmistokehitysbusinesscomputerSoftwareInformation Systems
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Relaxation of a weakly discontinuous functional depending on one control function

2008

The paper considers an optimal control problem of the typewhere the set M of admissible controls consists of all measurable vector‐functions h, which can take only two values h1 or h2. It is shown that the relaxation of this problem can be explicitly computed by rank‐one laminates.

weakly discontinuous functionalMathematical analysisType (model theory)Optimal controlControl functionSet (abstract data type)elliptic systemoptimal controlrelaxationControl theoryModeling and SimulationQA1-939Relaxation (approximation)AnalysisMathematicsMathematicsMathematical Modelling and Analysis
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