Bruin, J.J. de

replacement component group failure maintenance function m-failure number energy cost system energy threshold replacement rule light standards maintenance cost distribution replacementrule light lifetime assembly policy chandelier threshold age light-standard secant method epoch method non-failed value standard n components table hazard rate non-failed components block replacement rule system renewal renewal unit time m-failure group replacement redundancy simulation research k-bulb replacement probability failure rate block secant preventively non-failed lamps group replacement rule group replacement rules threshold age tc point context 4- failure epoch order case-study problem terminal section result hazard system age figure y t c power law function consumption set-up activity component number i dekker lampholder situation set-up society growth function europe age-criterion luminosity m components maintenanceand energy cost