List of Articles Cost optimization Open Access Article Abstract Page Full-Text 1 - Cost and Sensitivity Analysis of Transient Markovian Queue with Waiting Server, Heterogeneous Vacation Policy and Reneged Customers Mayank Singh Madhu Jain Arumugam Azhagappan 10.82374/jiej.2024.1039455 Open Access Article Abstract Page Full-Text 2 - Vacation model for Markov machine repair problem with two heterogeneous unreliable servers and threshold recovery Madhu Jain Rakesh Kumar Meena