Browsing by Author "Yadavalli, Venkata S. Sarma"

Browsing by Author "Yadavalli, Venkata S. Sarma"

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  • 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 ...
  • Privacy-preserving data mining of cross-border financial flows 
    Sekgoka, Chaka Patrick; Yadavalli, Venkata S. Sarma; Adetunji, Olufemi (Cogent OA, 2022)
    Criminal networks continue to utilize the global financial system to launder their proceeds of crime, despite the broad enactment of anti-money laundering (aml) laws and regulations in many countries. Money laundering ...
  • 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 ...
  • 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 ...
  • Stochastic model for common cause failures and human error 
    Yadavalli, Venkata S. Sarma; Bekker, Andriette, 1958- (Southern African Institute for Industrial Engineering, 2005-05)
    A consistent asymptotic normal (CAN) estimator and confidence limits for the steady-state availability of series and parallel systems subject to unit failures, common-cause shock (CCS)failures and human error are studied. ...
  • 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 ...
  • 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 simulation for budget prediction for large surface mines in the South African mining industry 
    Hager, J.; Yadavalli, Venkata S. Sarma; Webber-Youngman, Ronald C.W. (Southern African Institute of Mining and Metallurgy, 2015-06)
    This article investigates the complex problem of a budgeting process for a large mining operation. Strict adherence to budget infers that financial results align with goals. In reality, the budget is not a predetermined ...
  • A supply chain management model to optimise the sorting capability of a ‘third party logistics’ distribution centre 
    Yadavalli, Venkata S. Sarma; Balcou, C. (Association for Professional Managers in South Africa, 2017-03)
    In this paper, the process flow within a high-end 3PL distribution centre is studied in order to determine the optimal split between the parcel size categories moved within the system. The article considers the application ...
  • Sustainability of power generation for developing economies : a systematic review of power sources mix 
    Ibrahim, Hanif Auwal; Ayomoh, Michael; Bansal, Ramesh C.; Gitau, Michael Njoroge; Yadavalli, Venkata S. Sarma; Naidoo, Raj (Elsevier, 2023-05)
    With affordable and clean energy being one of the Sustainable Development Goals (SDG7), most developing economies are still caught up with the dilemma of inadequate power supply and heavy dependence on fossil fuel. This ...
  • System dynamics comparison of three inventory management models in an automotive parts supply chain 
    Botha, Andries; Grobler, Jacomine; Yadavalli, Venkata S. Sarma (AOSIS Open Journals, 2017-03-30)
    BACKGROUND : The automotive parts supply chain measures its success in terms of parts availability and stock required to achieve the availability target, measured as allocation fill rate (AFR). The supply chain strives ...
  • Systems with extended availability and switchover delays 
    Yadavalli, Venkata S. Sarma; Hameed, M.A. Shahul; Prathaban, L.; Thaga, K. (Southern African Institute for Industrial Engineering, 2007-11)
    A system with extended availability and switchover delays with a single repair facility is considered, with a random extended available period having a switching delay from online failure to the repair of the facility. ...
  • A transportation model for an effective disaster relief operation in the SADC region 
    Baraka, J.-C.M.; Yadavalli, Venkata S. Sarma; Singh, R. (Southern African Institute for Industrial Engineering, 2017-08-31)
    This paper reviews some challenges faced by humanitarian logistics and supply chain organisations in the transportation of resources, evacuees, and emergency supplies for disaster relief operations in the SADC region. To ...
  • Two substitutable perishable product disaster inventory systems 
    Yadavalli, Venkata S. Sarma; Sundar, Diatha Krishna; Udayabaskaran, Swaminathan (Springer, 2015-01)
    A disaster inventory system is considered in which two substitutable items are stored for disaster management. In the event of disaster management, a particular product may become stock-out and the situation warrants ...
  • 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 ...
  • A two-component production inventory-assembly system 
    Yadavalli, Venkata S. Sarma (Southern African Institute for Industrial Engineering, 2006-11)
    The paper considers a two-component continuous review inventory system where one of two components is produced by the organisation and the other is supplied by an outside supplier. The two components are assembled into ...
  • A two-product inventory system with product interaction 
    Yadavalli, Venkata S. Sarma; Hargreaves, C. (Southern African Institute for Industrial Engineering, 2003)
    In this paper, we study a two-component continuous review inventory system. We assume that demand occurs according to a Poisson process and that a demand can be satisfied only if both the components are available in the ...