摘要:

ZusammenfassungAn die fördertechnischen Einrichtungen für den betriebs-internen Warentransport werden immer hohere Anforderungen gestellt. Die schwierigen Aufgaben bei der Planung und beim Betrieb moderner innerbetrieblicher Transportanlagen konnen daher oft nur mit dem Einsatz leistungsfähiger Analyseinstrumente bewaltigt werden. Hiezu bietet sich die Computer-Simulation an. Allerdings zeigt es sich immer wieder, dass der Erfolg ihres Einsatzes in hohem Masse von der Wahl der Programmiersprache, der Programmstruktur und der Vorgehensweise bei der Modellkonzeption abhangt. Im vorliegenden Fall hat die Verwandtschaft des Analyse-objekts“Stückgutverkehr auf einer automatischen Waren- transportanlage”mit der Simulationssprache GPSS/360 zur Entwicklung eines Simulationsmodells geflihrt, dem einige wesentliche methodologische Aspekte von GPSS/360 zugrunde liegen. Der modulare Programmaufbau–welcher sich auch fiir die Erweiterung auf interaktive Verarbeitung eignet–hat sich in mancherlei Hinsicht bewährt. Jedenfalls ist es gelungen, ein umfangreiches Modell aufzubauen und ohne nennenswerte Schwierigkeiten auf ein konkretes grosses Projekt anzuwenden.

ISSN:0228-6203    

DOI:10.1080/02286203.1981.11759748

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractThe AXAR-PRT transportation system is first presented through the network structures and working principles.Then the expected characteristics of the simulation program are given, and the data of the system are collected. The simulation program is presented -network description and coding, events processing, results- and an application example is mentionned.

ISSN:0228-6203    

DOI:10.1080/02286203.1981.11759948

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractIn the paper a simulation model is described which is being used in the analysis of Genoa railroad node performance under different operating conditions and traffic control rules. Such a model describes the system to be studied in terms of topological and functional characteristics, train composition and criteria for traffic control. The simulation purposes are the measurement of the maximum traffic capacity in the node and the test of alternative control rules and/or information support hardware.

ISSN:0228-6203    

DOI:10.1080/02286203.1981.11759749

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractPEAS is a Fortran IV model to simulate a set-up for transport of patients (emergencies and not-emergencies) in an urban or rural area. The set-up includes several hospitals, vehicle stations, vehicle types (ambulance, parame die unit, etc.) and crews. The model allows radio dispatch of vehicles from any point in the area, as well as an emee gency-speed for vehicles serving an emergency call. The o- perating area is modelled as a network where the arcs repre sent the routes used for transport and the nodes are hospitals, stations or centres of geographical gravity of calls.Results of the simulation include statements about:––level of covering: distribution of response times for e- mergencies and for non-emergencies, loading factor of vehicles and working time of crews. The model calculates all these points for the whole area and for given sub-a^ reas: global and local levels of covering––costs: annual costs and costs per call (including expenses for buildings, personnel and vehicles) for each type of call.To find a good arrangement for a set-up, the model answers such questions as: What would happen to ambulance covering and to costs if ...?It is possible to analyse the influence of:––vehicle stations (number, location, operating duties, districts)––hospitals (ditto)––vehicles (number, types, position)––crews (ditto, working hours)

ISSN:0228-6203    

DOI:10.1080/02286203.1981.11759750

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractIn this paper we consider the development ; simulation and identification of a two-sector growth economic model. The sectors of production are ca-pital and consumer goods with constant returns to scale production functions. The market conditions are those of perfect competition. Full employment and full utilization of the factors of production are also assumed. With savings, technological change, and capital depreciation as control parameters, the model presents an interesting vehicle for the simulation of economic systems and the identification of related parameters and production functions on the basis of past data on capital and consumer goods production.Indeed, utilizing realistic values of savings and other control parameters the system is simulated and the parameters are identified by means of the simulated data in the presence of imposed realistic disturbances. The identification procedure is actually based on non-linear regression/least- squares methods combined with a utilization of a Second-order optimization algorithm.It is intended to generalize the model by eliminating some of the assumptions imposed in the present and applying it to actual economic conditions after the collection of actual data in the Greek environment.

ISSN:0228-6203    

DOI:10.1080/02286203.1981.11759751

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractModuleco is a time-sharing system specialized on simulation and optimization of large macro-economic models (1 000 equations). These models are deterministic, non linear and written asft(xt,xt−1,....,xt−p)=0.​​​​​​​ΑMODULECO user disposes of a new modelling language. The software translates the equations into an internal code which is used by the simulation and optimization algorithms.We hereby present the simulation results obtained on these kinds of models and an example of simulation using the MODULECO language.Simulation methods adapted to the particularities of an economic model matrix have been used. These methods were developed by the MODULECO team. Experience with them has shown that we obtain better matrix decomposition and resolution times.The Moduleco language provides a set of basic commands and an extension mechanism. The user has the possibility of combining existing commands under the control of a program. Such a program may later be defined as a new command in Moduleco. Such a program as well as the command language are interpreted. A new command may also be defined by giving reference to a program written in a programming language.The calling of such a command at the terminal will result in the execution of the associated program.

ISSN:0228-6203    

DOI:10.1080/02286203.1981.11759752

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractBusiness information systems, as other computer applications developed nowadays, are becoming increasingly complex. There is a growing recognition that the classical design methods are not adequate for building such systems. Diverse attempts have been made to couple data base design methods with structured design and top-down software development. But most of the methods now available consider explicitly only the static aspects of the systems, the system dynamics being implicitly modelled. The methodology suggested here takes the dynamics aspects of the systems explicitly into account in using concepts developed in some simulation languages as well as in operating systems modelling. This approach leads to a decomposition of the business information systems into a network of processes (concurrent or distributed) which cooperate to perform the tasks assigned to the system. We will show that it is possible, using these concepts to derive a methodology which integrates structured system’s analysis and system’s design, structured data base design and data structuring programming and which leads to isomorphic structures at each development step. It is then possible to have a common set of tools for describing the problem from the beginning to the end, from user requirements through program design.

ISSN:0228-6203    

DOI:10.1080/02286203.1981.11759753

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractIn this paper a description of graph oriented model of chemical industry is given, and some problems connected with technological den- drit manipulations are presented.

ISSN:0228-6203    

DOI:10.1080/02286203.1981.11759754

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

摘要:

AbstractThe presented approach makes it possible to investigate the interconnection between educational and national economy systems. The existing Polish educational system with its future changes has been described which enable authors to formulate the model equations. The model takes into consideration all school levels with their essential parameters and enables to estimate the number of people with specified education level every year.Model parameters were obtained by the investigation of the statistical data. A simple simulation model and a computer BASIC program were constructed. The computer simulation was carried out to verify the model and investigate how the state policy influences the functioning of the educational system.Some possibilities of application of the presented model to determine the future state strategies in the school system management were also underlined.

ISSN:0228-6203    

DOI:10.1080/02286203.1981.11759755

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor

ISSN:0228-6203    

DOI:10.1080/02286203.1981.11759756

出版商:Taylor&Francis    

年代:1981

数据来源: Taylor