Monograph Article dissertation (summary + original articles) Department Laboratory Field of research Opponent(s) Supervisor (Instructor) Abstract X The new re-regulated markets for electricity, stricter environmental policies and regulations, especially regarding greenhouse gases, form a new operating environment for energy systems. The new environment requires systems that are cost-efficient a...

An anaesthetist-led outpatient pre-operative assessment (OPA) clinic was introduced in our unit in an effort to improve patient care and cost-effectiveness. To assess the efficiency of the clinic, 112 patients who attended the OPA clinic (attendance rate 98%) during the first year were assessed prospectively and compared with 118 patients who did not undergo OPA the year before. There were fewe...

We used decision-analysis modeling to determine the most cost-effective fixation device among Herbert screws, AO screws, and the Luhr plate for first metatarsophalangeal joint arthrodesis. The model considered patient-reported outcomes at minimum 2-year follow-up, patient charges for the entire course of care, and event and outcome incidences within each fixation group. AO screws had the lowest...

Operating System obsolescence is widely considered an important factor when architectural choices are made during the planning phase of systems development and maintenance. In this work, we seek to understand the importance that planners actually ascribe to this attribute in practice, and ask probing questions to the managers, developers, and analysts of systems in industry in the form of a sur...

Organizations spend significant resources tracking customer satisfaction and managing service delivery. Although a great deal of effort is expended in understanding what goes on within each of these areas, little or no effort has been applied to identifying and quantifiing the relationships between the two. The objective of this research is to discover and establish potential relationships betw...

Abstract: Minimizing the work consumed in refrigeration system is the most effective measure to reduce the cost of products in sub-ambient chemical processes. The introduction of mixed working fluids into refrigeration system in place of pure working fluids is a recent advancement applied in the field. Due to the lack of systematic design method for Mixed Refrigerant Cycle (MRC), conventional a...

Parallel computing is a topic of interest for a broad scientific community since it facilitates many time-consuming algorithms in different application domains.In this paper, we introduce a novel platform for parallel computing by using MPI and OpenMP programming languages based on set of networked PCs. UMZHPC is a free Linux-based parallel computing infrastructure that has been developed to cr...

This paper analyzes a controllable discrete-time machine repair problem withL operating machines and two repairmen. The number of working servers can be adjusteddepending on the number of failed machines in the system one at a time at machine's failure orat service completion epochs. Analytical closed-form solutions of the stationary probabilities ofthe number of failed machines in the system a...

In this thesis we examine how fuel price variation affects the optimal mix of services in intercity transportation. Towards this end, we make two main contributions. The first is the development of an analytic total logistics cost model of intercity transportation, which is sensitive to fuel price and incorporates multiple classes of vehicles serving passengers with differentiated values of tim...