Human Resources (HR) is one of the most important instruments in an organization. In face today's fierce competition, globalization. The success or failure organization achieving its goals very dependent on ability carrying out tasks assigned by Because HR that can motivate members to improve performance. To be able productivity human resources better, agency management must and required manage...

Water is the first and foremost limiting factor for agricultural production, and undoubtedly, water crisis is considered as one of the international challenges for governments and human societies. Given that virtual water was first used as a way to tackle water scarcity in countries with limited water resources, so that countries with low water should import food from abundant countries...

This paper derives optimal policies for when to hire, train and layoff employees in service organization when worker productivity appreciates deterministically or stochastically under constant, monotonic, and cyclic service demand. The model, an extension of the machine replacement problem from the engineering economy literature, uses infinite horizon linear programming to produce optimal perso...