“…Researches that apply reliability analysis in reliability improvement include [3], [11], [12], [13], [14], [15], [17], [19]- [22] [23]- [32], [34], [36]. Meanwhile, another researches that practice maintenance strategies for reliability improvement include [10], [16], [18], [35], [37], [38]. In addition, the only research that performs design optimization in reliability improvement is [33].…”