The paper describes a single perishing product inventory model in which items deteriorate in two phases and then perish. An independent demand takes place at constant rates for items in both phases. A demand for an item in Phase I not satisfied may be satisfied by an item in Phase II, based on a probability measure. Demand for items in Phase II during stock-out is lost. The reordering policy is an adjustable (S, s) policy with the lead-time following an arbitrary distribution. Identifying the underlying stochastic process as a renewal process, the probability distribution of the inventory level at any arbitrary point in time is obtained. The expressions for the mean stationary rates of lost demand, substituted demand, perished units and scrapped units are also derived. A numerical example is considered to highlight the results obtained.

Reordering motor vehicle spare parts for the purposes of stock replenishment is an important function of the parts manager in the typical motor dealership. Meaningful reordering requires a reliable forecast of the future demand for items. A variety of alternative forecasting techniques were evaluated for this purpose with the aim of selecting one optimal technique to be implemented in an automatic reordering module of a real time computerized inventory management system. OPSOMMINGAanvulling van onderdeelvoorraad is 'n belangrike funksie van die onderdelebestuurder in die tipiese motorhandelsaak.Sinvolle herbestelling vereis 'n betroubare vooruitskatting van die toekomstige vraag na items. 'n Verskeidenheid alternatiewe vooruitskattingstegnieke is evalueer ten einde 'n optimale tegtniek te vind vir implementering in die outomatiese herbestelmodule van 'n intydse gerekenariseerde voorraadbestuurstelsel.

Supply planning and traffic flow planning are major activities in the automotive manufacturing environment worldwide. Traditionally, the impact of supply planning strategies on plant traffic is rarely considered. This paper describes the development of a Decision Support System (DSS) that will assist automotive manufacturers to analyse the effect of supply planning decisions on plant traffic during the supply planning phase of their logistics planning process. In essence, this DSS consists of a Supply Medium Decision Support Tool (SMDST) (an interactive MS-Excel model with Visual Basic interfacing) and a traffic flow simulation model tool (using eMPlant simulation software). OPSOMMINGVerskaffingsbeplanning en verkeersvloeibeplanning is belangrike aktiwiteite in die motorvervaardigingsbedryf wêreldwyd. Tradisioneel word die uitwerking van verskaffings-beplanningsstrategië op aanlegverkeer selde in ag geneem. Hierdie artikel beskryf die ontwikkeling van 'n Besluitnemings Ondersteuningstelsel (DSS) wat motorvervaardigers sal ondersteun in die analise van die effek van verskaffingsbeplanningbesluite op aanlegverkeer tydens die verskaffingsbeplanningsfase van hulle logistieke beplanningsproses. Hierdie DSS bestaan hoofsaaklik uit 'n Verskaffings-vervoermiddel Besluitnemingshulpmiddel (SMDST) ('n interaktiewe MS-Excel model met "Visual Basic" koppelling) asook 'n simulasiemodel van verkeersvloei (met eM-Plant simulasiesagteware).

The rapid development in computer networks has enabled the implementation of new methods of data distribution. There are however, no available tools for supportinq decision making and planning in this application area and operators have to rely on manual methods to design schedules for data and software distribution. This manual approach takes long and typically results ' In distribution projects that are both costly and slow. This article presents 'o new approach to the data distribution scheduling problem that produces schedules for implementation based on minimum distribution cost or minimum distribution time.

Automated distribution of computer software via electronic means in large corporate networks is growing in popularity. The relative importance of personal computer software, in financial and logistical terms, is described and the developing need for automated software distribution explained.An actual comparitive example of alternative software distribution strategies is presented and discussed proving the viability of Electronic Software Distribution. OPSOMMINGGeoutomatiseerde verspreiding van rekenaarprogrammatuur met behulp van elektroniese metodes in groot korporatiewe netwerke, is toenemend populer, Die relatiewe belangrikheid van persoonlike rekenaarprogrammatuur in finansiele en logistieke terme word bespreek en die groeiende behoefte na geoutomatiseerde programmatuurverspreiding verduidelik. 'n Werklike vergelykende voorbeeld van alternatiewe programmatuurverspreidingsstrategiee word aangebied en bespreek wat die lewensvatbaarheid van Elektroniese Programmatuurverspreiding bewys.