Dr V M Chacko

Recent Submissions

  • Weibull-Lindley Distribution: A Bathtub Shaped Failure Rate Model 
    Chacko VM; Deepthi KS; Beenu Thomas; Rajitha C (Gnedenko Forum, 2018-12)
    The Lindley and Weibull are the two most commonly used distributions for analyzing lifetime data. These distributions have several desirable properties and nice physical interpretations. This paper introduces a new ...
  • Identification of Failure Rate Behaviour of Increasing Convex (Concave) Transformations 
    Deepthi KS; Chacko VM (Gnedenko Forum, 2021-03)
    In this paper, increasing convex (concave)Total Time on Test (TTT) transform of a lifetime random variable is considered.In order to identify the failure rate model of functions of random variables, the TTT of transformed ...
  • Exponential-Gamma (3,θ) Distribution and its Applications 
    Chacko VM; Beenu Thomas (Gnedenko Forum, 2020-09)
    Lifetime distributions for many components usually have a bathtub shape for its failure rate function in practice. However, there are a very few distribution have bathtub shaped failure rate function.Models with bathtub-shaped ...
  • Dus transformation of inverse weibull distribution: An upside-down failure rate model 
    Chacko VM; Gauthami P (Gnedenko Forum, 2021-06)
    A new upside-down bathtub shaped failure rate distribution, DUS Inverse Weibull (DUS-IW) distribution is proposed and its properties are studied. The DUS-IW distribution has upsidedown bathtub shaped and decreasing failure ...
  • Continuous Multistate System Universal Generating Function 
    Chacko, VM (Gnedenko Forum, 2018)
    Usually, systems and components are described as being in one of two modes, “on”or “off.” Such systems are described using binary structure functions. In multistatesystems (MSS), components can be in more than two states—for ...
  • A Queue Network M/M/1/∞ Model 
    Rajitha C; Chacko VM (Gnedenko Forum, 2019)
    In this paper we model an open queueing network of cardiac treatment section in medical sector. Assume arrival of patients follows Poisson and service times at stations have exponential distribution. The performance measures ...
  • On Exponential-Weibull Distribution Useful in Reliability and Survival Analysis 
    Anakha KK; Chacko VM (Gnedenko Forum, 2020-03)
    In this paper, mixture of Exponential and Weibull distributions is considered for modelling real lifetime data. The basic mathematical properties including moments, generating functions, order statistics etc are derived. ...
  • A ‘One Parameter’ Bathtub Shaped Failure Rate Distribution 
    Chacko, VM; Thomas, Beenu; Deepthi, KS (Gnedenko Forum, 2017-09)
    Most real life system exhibit bathtub shapes for their failure rate functions. Generalized Lindley, Generalized Gamma, Exponentiated Weibull and xExponential distributions are proposed for modeling lifetime data having ...
  • Joint importance measures for multistate reliability systems 
    Chacko, VM; Manoharan, M (Operational Research Society of India, 2011-07-30)
    Importance and joint importance measures in reliability engineering are used to identify the weak areas of a system and signify the roles of components in either causing or contributing to proper functioning of the system. ...