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Research Articles (Industrial and Systems Engineering): Recent submissions

  • Can complexity analysis support business performance insight? 
    Janse van Rensburg, Antonie C. (Southern African Institute for Industrial Engineering, 2012-07)
    Most people intuitively understand complexity, but being able to analyse it scientifically is not a common practice. For business executives, ‘complexity’ must be one of the most important concepts to understand, as it ...
  • Enhancing customer experience through business process improvement : an application of the Enhanced Customer Experience Framework (ECEF) 
    Botha, G.J. (Gesina Jozina); Kruger, P.S. (Paul Stephanus), 1944-; De Vries, Marne (Southern African Institute for Industrial Engineering, 2012-05)
    In 2010 Botha, Kruger & De Vries [5] introduced a framework for enhancing customer experience through improved business processes. They developed the Enhanced Customer Experience Framework (ECEF) by integrating various ...
  • Applying min-max k postmen problems to the routing of security guards 
    Willemse, Elias J.; Joubert, Johan W. (© 2012 Palgrave Macmillan, a division of Macmillan Publishers Limited. ., 2012-02)
    The most essential and alluring characteristic of a security estate is the estate's ability to provide 24-h security to its residents, of which the continual patrolling of roads and paths is vital. The objective of this ...
  • Designing, modelling and optimising of an integrated reliability redundant system 
    Sankaraiah, G.; Sarma, B.D.; Umasankar, C.; Yadavalli, Venkata S. Sarma (Southern African Institute for Industrial Engineering, 2011)
    The reliability of a system is generally treated as a function of cost; but in many real-life situations reliability will depend on a variety of factors. It is therefore interesting to probe the hidden impact of constraints ...
  • A stochastic point process model of the incubation period of a HIV infected individual 
    Yadavalli, Venkata S. Sarma; Labeodan, Moremi Morire OreOluwapo; Udayabaskaran, Swaminathan (South African Statistical Association, 2011)
    The inability to get people to regularly test and know their HIV status has caused the widespread unavailability of correct and comprehensive data on HIV infection especially the time at which an individual was first ...
  • Stochastic fractional programming approach to a mean and variance model of a transportation problem 
    Charles, V.; Yadavalli, Venkata S. Sarma; Rao, M.C.L.; Reddy, P.R.S.; Judice, J.J. (Hindawi Publishing Corporation, 2011-02-23)
    In this paper, we propose a stochastic programming model, which considers a ratio of two nonlinear functions and probabilistic constraints. In the former, only expected model has been proposed without caring variability ...
  • An environment-dependent branching process 
    Yadavalli, Venkata S. Sarma; Karthikeyan, T.; Udayabaskaran, Swaminathan (South African Statistical Association, 2010-12)
    A mathematical model of a biological population, taking into account the effect of environmental in uences both on the life-time distribution and on the reproductive capacity of the individuals of the population, ...
  • Modelling of uncertainty in minimising the cost of inventory for disaster relief 
    Van Wyk, Estelle; Bean, Willemiena Lodewika; Yadavalli, Venkata S. Sarma (Southern African Institute for Industrial Engineering, 2011-05)
    Natural disasters - and even those caused by people - are largely unpredictable. So disasters need to be researched and their impact fully understood, so that the aid supplies required to ensure survival during and after ...
  • On some optimisation models in a fuzzy-stochastic environment 
    Luhandjula, M.K.; Joubert, Johan W. (Southern African Institute for Industrial Engineering, 2010-12)
    This paper is on fuzzy stochastic optimisation, an area that is quickly coming to the forefront of mathematical programming under uncertainty. An even stronger motivating factor for the growing interest in this area can ...
  • Large-scale agent-based combined traffic simulation of private cars and commercial vehicles 
    Joubert, Johan W.; Fourie, P.J. (Pieter Jacobus); Axhausen, Kay W. (National Academy of Sciences, 2010-11)
    The number of independent and interdependent freight actors (firms), the complex supply chain structures among them, and the sensitivity of shipment data are but a few reasons why modeling freight traffic is lagging its ...
  • Modelling T4 cell count as a marker of HIV progression in the absence of any defense mechanism 
    Yadavalli, Venkata S. Sarma; Labeodan, Moremi Morire OreOluwapo; Udayabaskaran, Swaminathan; Forche, N. (Operations Research Society of SA, 2010-08)
    The T4 cell count, which is considered one of the markers of disease progression in an HIV infected individual, is modelled in this paper. The World Health Organisation has recently advocated that countries encourage HIV ...
  • Proposed business process improvement model with integrated customer experience management 
    Botha, G.J. (Gesina Jozina); Janse van Rensburg, Antonie C. (Southern African Institute for Industrial Engineering, 2010-05)
    In these modern times it is more and more difficult to become and stay competitive in the business environment. Customers have increasingly more products to choose from and more channels through which they can satisfy their ...
  • Two-commodity perishable inventory system with bulk demand for one commodity 
    Yadavalli, Venkata S. Sarma; Adetunji, Olufemi; Sivakumar, B.; Arivarignan, G. (Southern African Institute for Industrial Engineering, 2010-04)
    This article considers a two-commodity continuous review inventory system in which the arriving customers belong to any one of three types, such that type 1 customers demand a single item of the first commodity, type 2 ...
  • Planning empty container relocations under uncertainty 
    Bean, Willemiena Lodewika; Joubert, Johan W. (Southern African Institute for Industrial Engineering, 2010-05)
    Reusable packaging often accumulates downstream in supply chains, resulting in non-revenue-earning relocations. This paper presents a reliable optimisation model under supply and demand uncertainty. Instead of using ...
  • A stochastic model of the dynamics of HIV under a combination therapeutic intervention 
    Yadavalli, Venkata S. Sarma; Labeodan, Moremi Morire OreOluwapo; Udayabaskaran, Swaminathan; Mwanga, Y.A. (Operations Research Society of SA, 2009)
    Drug resistance to single therapeutic treatment in HIV infected individuals has promoted research into combined treatments. In this paper we propose a stochastic model under combined therapeutic treatment by extending ...
  • How integrated is integrated logistics? 
    Pretorius, Pieter J. (Southern African Institute for Industrial Engineering, 1997)
    Industry and academia still have a major problem in grasping the extent and relationships of all functions involved in integrated logistics. This is because business logistics and logistics engineering developed separately, ...
  • Metaheuristics for the multi-objective FJSP with sequence-dependent set-up times, auxiliary resources and machine down time 
    Grobler, Jacomine; Engelbrecht, Andries P.; Kok, Schalk; Yadavalli, Venkata S. Sarma (Springer, 2009-01)
    This paper investigates the application of particle swarm optimization (PSO) to the multi-objective flexible job shop scheduling problem with sequence-dependent set-up times, auxiliary resources and machine down time. To ...
  • Stochastic differential equation-based flexible software reliability growth model 
    Kapur, P.K.; Anand, Sameer; Yamada, Shigeru; Yadavalli, Venkata S. Sarma (Hindawi, 2009)
    Several software reliability growth models (SRGMs) have been developed by software developers in tracking and measuring the growth of reliability. As the size of software system is large and the number of faults detected ...
  • Inferring commercial vehicle activities in Gauteng, South Africa 
    Joubert, Johan W.; Axhausen, Kay W. (Elsevier, 2011-01)
    To address the underreporting of freight from a transport geography point of view, we present a novel analysis of the time and spatial characteristics of disaggregated commercial vehicle activities. The activities were ...
  • Evaluating and refining the 'enterprise architecture as strategy' approach and artefacts 
    De Vries, Marne; Janse van Rensburg, Antonie C. (Southern African Institute for Industrial Engineering, 2009-05)
    Enterprise Architecture (EA) is a new discipline that has emerged from the need to create a holistic view of an enterprise, and thereby to discover business/IT integration and alignment opportunities across enterprise ...