The stability of sexual risk behavior over time is a common assumption in models of HIV transmission. In this thesis I show that this assumption does not hold in a population of gay men at risk of HIV infection and that the violation of this assumption has major implications for our...

This paper introduces a formal mathematical taxonomy of four principal health insurance models: Bismarckian, Beveridgean, Commercial, and Collaborative & Contributive (C&C). Each model is analyzed for its structural characteristics, sustainability conditions, and demographic resilience under...

Purpose – The purpose of this paper is to make a performance model of a shoe upper manufacturing unit of a shoe manufacturing industry by computing both the availabilities, i.e. time dependent system availability (TDSA) and the long‐term availability. Design/methodology/approach – The...

Purpose – The purpose of this paper was to solve the shortage of carrying energy in probing robot and make full use of wind resources in the Antarctic expedition by designing a four-wheel land-yacht. Land-yacht is a new kind of mobile robot powered by the wind using a sail. The mathematical...

Purpose – The purpose of this paper is to examine how utilization of non‐financial manufacturing performance (NFMP) measures impacts the lean manufacturing/financial performance relationship. Design/methodology/approach – A structural equation model (SEM) is estimated using data provided...

Purpose – The primary objective of this paper is to show how mathematical modeling can be used for solving a third party logistics (3PL) allocation problem. Design/methodology/approach – The solution approach consists of finding a compromise solution for the six different strategies, defined...

Purpose – Extensive literature on business process management suggests that organizations could enhance their overall performance by adopting a process view of business. However, there is a lack of empirical research in this field. The purpose of this paper is to investigate the understanding...

Hubs are centers for collection, rearrangement,and redistribution of commodities in transportation networks. In this paper, non-linear multi-objective formulations for single and multiple allocation hub maximal covering problems as well as the linearized versions are proposed. The formulations...

Automobile sector forms the backbone of manufacturing sector. Vehicle assembly line is important section in automobile plant where repetitive tasks are performed one after another at different workstations. In this thesis, a methodology is proposed to reduce cycle time and time loss due to...

The paper deals with the actual problem of the functioning and development of district heating systems in the framework of the transition to intelligent energy, in which the active consumers (prosumers) holds the key place. The paper proposes an optimization mathematical model for management the...