Browsing Engineering, Built Environment and Information Technology by Author "Yadavalli, Venkata S. Sarma"

Browsing Engineering, Built Environment and Information Technology by Author "Yadavalli, Venkata S. Sarma"

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  • An investigation into factors impacting financial exclusion at the bottom of the pyramid in South Africa 
    Wentzel, John Peter; Diatha, Krishna Sundar; Yadavalli, Venkata S. Sarma (Routledge, 2016-02)
    Financial exclusion has been shown to have negative socioeconomic effects on citizens, especially at the bottom of the economic pyramid. South Africa suffers from high levels of financial exclusion, disproportionately ...
  • A lot-sizing model for a multi-state system with deteriorating items, variable production rate, and imperfect quality 
    Tshinangi, Kapya; Adetunji, Olufemi; Yadavalli, Venkata S. Sarma (Ram Arti Publishers, 2022-10)
    Conventional production systems assume that during the manufacturing processes, machines operate without breakdown over an infinite planning horizon and manufacture only products of good quality. Imperfect production ...
  • Low-cost energy meter calibration method for measurement and verification 
    Carstens, Herman; Xia, Xiaohua; Yadavalli, Venkata S. Sarma (Elsevier, 2017-02)
    Energy meters need to be calibrated for use in Measurement and Verification (M&V) projects. However, calibration can be prohibitively expensive and a ect project feasibility negatively. This study presents a novel low-cost ...
  • Managing the cold chain : a case study at a South African ice cream company 
    Grobler, Jacomine; Yadavalli, Venkata S. Sarma (Southern African Institute for Industrial Engineering, 2008-11)
    This paper documents the results of a supply chain management (SCM) case study conducted at Centurion Ice Cream and Sweets CC, a producer of ice cream in the greater Gauteng area. The current SCM environment was first ...
  • Max-EWMA chart for autocorrelated processes (MEWMAP chart) 
    Thaga, K.; Yadavalli, Venkata S. Sarma (Southern African Institute for Industrial Engineering, 2007-11)
    This paper proposes an exponentially weighted moving average (EWMA) control chart that is capable of detecting changes in both process mean and standard deviation for autocorrelated data (referred to as the Maximum ...
  • Measurement uncertainty in energy monitoring : present state of the art 
    Carstens, Herman; Xia, Xiaohua; Yadavalli, Venkata S. Sarma (Elsevier, 2018-03)
    Measurement uncertainty is a key component in the overall uncertainty calculation for Measurement and Verification (M&V) projects. However, in some cases, it is reduced to outlier detection or basic uncertainty propagation ...
  • 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 ...
  • Minimising electricity costs by developing an effective combination of alternative energy sources 
    Yadavalli, Venkata S. Sarma; Steyl, J. (Southern African Institute for Industrial Engineering, 2020-12)
    This study evaluates the high electricity costs faced at a carpet manufacturing company. Research was conducted by focusing on the supply and availability of electricity in South Africa and alternative energy sources. ...
  • Modeling and characterizing software vulnerabilities 
    Bhatt, Navneet; Anand, Adarsh; Yadavalli, Venkata S. Sarma; Kumar, Vijay (IJMEMS, India, 2017)
    With the association of software security assurance in the development of code based systems; software developers are relying on the Vulnerability discovery models to mitigate the breaches by estimating the total number ...
  • 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 ...
  • 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 ...
  • A multi-objective fuzzy mathematical approach for sustainable reverse supply chain configuration 
    Darbari, Jyoti D.; Agarwal, Vernika; Yadavalli, Venkata S. Sarma; Galar, Diego; Jha, Prakash C. (AOSIS Open Journals, 2017-03-27)
    BACKGROUND : Designing and implementation of reverse logistics (RL) network which meets the sustainability targets have been a matter of emerging concern for the electronics companies in India. OBJECTIVES : The present ...
  • On Gaver's parallel system 
    Vanderperre, E.J.; Yadavalli, Venkata S. Sarma; Makhanov, S.S. (Southern African Institute for Industrial Engineering, 2004)
    Gaver’s parallel system (and its variants) has received considerable attention in the literature. The Laplace-transform (LT) of the survival function, corresponding to the underlying systems, has been derived by various ...
  • Optimal scheduling policy for a multi-upgraded software system under fuzzy environment 
    Anand, Adarsh; Das, Subhrata; Agarwal, Mohini; Yadavalli, Venkata S. Sarma (ITB Journal Publisher, 2019)
    Many reliability growth models related to the concept of multi upgradation have recently been proposed. This concept has helped software developers to develop a competitive edge over competitors by regularly introducing ...
  • Optimal trade credit and replenishment policies for non-instantaneous deteriorating items 
    Sharma, Anuj Kumar; Tiwari, Sunil; Yadavalli, Venkata S. Sarma; Jaggi, Chandra K. (EDP Sciences, 2020-11)
    Please read abstract in the article.
  • A perishable product inventory system operating in a random environment 
    Yadavalli, Venkata S. Sarma; Van Schoor, Christiaan de Wet (Southern African Institute for Industrial Engineering, 2004)
    A model of a perishable product inventory system operating in a random environment is studied. For the sake of simplicity, the stochastic environment is considered to alternate randomly over time between two states 0 and ...
  • The power of one : Benford's law 
    Kruger, P.S. (Paul Stephanus), 1944-; Yadavalli, Venkata S. Sarma (Southern African Institute for Industrial Engineering, 2017-08-31)
    The concept of Benford’s law, also known as the first-digit phenomenon, has been known to mathematicians since 1881. It is counter-intuitive, difficult to explain in simple terms, and has suffered from being described ...
  • Probability management and the flaw-of-averages 
    Kruger, P.S. (Paul Stephanus), 1944-; Yadavalli, Venkata S. Sarma (Southern African Institute for Industrial Engineering, 2016-12-06)
    Uncertainty is ever-present and is an integral part of life. Recognising the existence of uncertainty and its possible effects on decision-making may be important for the profitability, financial success, or even survival ...
  • Reliability stochastic optimization for an n-stage series system with m chance constraints : research letter 
    Yadavalli, Venkata S. Sarma; Malada, Awelani; Charles, V. (Academy of Science of South Africa, 2007-11)
    This paper addresses the chance constraints reliability stochastic optimization (CCRSO) problem, for which the objective is to maximize system reliability for the given chance constraints. A method is illustrated to determine ...
  • 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 ...