We propose an extension to the basic DEA models that guarantees that if an intensity is positive then it must be at least as large as a pre-defined lower bound. This requirement adds an integer programming constraint known within Operations Research as a Fixed-Charge (FC) type of constraint. Accordingly, we term the new model DEA FC. The proposed model lies between the DEA models that allow uni...

An underwater robotic vehicle is being developed at the UFABC (Universidade Federal do ABC) which has as main mission the inspection of ship hull thickness using ultrasonic transducers. This is a hybrid ROV (Remotely Operated Vehicle) due to its extreme locomotion capabilities adapted of the terrain tracked vehicles. This paper presents the surgeyaw control system of a new hybrid underwater veh...

OBJECTIVES To examine the profile of regular attenders to an accident and emergency (A&E) department, and to estimate the percentage of the overall departmental workload attributed to this group of patients, together with the resultant cost to the department of these attendances. METHODS A retrospective study of regular attenders to the A&E department at Hull Royal Infirmary was conducted bet...

We consider direct markets, pure exchange economies in which agents supply their time, when they are subject to location, time, and free disposal constraints. If agents’ entire time endowment has to be devoted to the market (no freedisposal), such economies generate the entire class of TU-games, proving that every TU-game is a market game, and thus generalizing Shapley and Shubik’s (1969) and G...

Disasters occur due to both the natural and man-made activities. Hazards and Disasters are categorized into four groups, viz., Natural events, Technological events, Man-made events and Region-wise events. The adverse impacts caused due to the indiscriminate disposal of Hazardous Wastes (HWs) come under the category of Environmental Disasters. Hazardous Waste Management (HWM) is a very important...

Campylobacter jejuni is a food-borne bacterial pathogen that colonizes the intestinal tract and causes severe gastroenteritis. Interaction with host epithelial cells is thought to enhance severity of disease, and the ability of C. jejuni to modulate its metabolism in different in vivo and environmental niches contributes to its success as a pathogen. A C. jejuni operon comprising two genes that...

A set of vertices C in a graph is convex if it contains all vertices which lie on shortest paths between vertices in C. The convex hull of a set of vertices S is the smallest convex set containing S. The hull number h(G) of a graph G is the smallest cardinality of a set of vertices whose convex hull is the vertex set of G. For a connected triangle-free graph G of order n and diameter d ≥ 3, we ...

Mal’cev showed in the 1950s that there is a correspondence between radicable torsion-free nilpotent groups and rational nilpotent Lie algebras. In this paper we show how to establish the connection between the radicable hull of a finitely generated torsion-free nilpotent group and its corresponding Lie algebra algorithmically. We apply it to fast multiplication of elements of polycyclically pre...

The research presented in this thesis is targeted towards obtaining high quality novel views of a dynamic scene using video from multiple wide-baseline views, with free-viewpoint video as the main application goal. The research has led to several novel contributions to the 3D reconstruction computer vision literature. The first novel contribution of this work is the exact view-dependent visual ...