The main objective of this article is to give a survey on elementary functions in the context of quaternionic analysis. We define some of their more common properties, which as in the real and complex cases, will be familiar to the reader. This leads to the consideration of quaternion-valued functions depending on a quaternion variable, that is, functions whose input and output are quaternions....

The HERA-B application software modules are house by the frame program Arte. To use Arte in the online environment of the farm, input and output streams have to be buffered and interfaced. This note describes a concept for implementation of the frame program Arte and the I/O modules in the multi-process environment of the farm.

We analyze the operational performance of 202 Turkish rural general hospitals. To help improve performance on both input and output space, we adopt a directional distance approach. We treat a mortality based measure as a “needs indicator”. We derive pure technical, scale and output congestion inefficiency measures and show how they vary across size classes. We show that “reducing mortality” inv...

This paper presents an algebraic method to design a dynamic gain unknown input observer for linear systems with commensurate delays in state, input and output variables. Necessary and sufficient conditions for the existence of such an observer are provided as well as a constructive procedure. An example is given in order to illustrate the proposed method.

We present a model for the ontogenesis of information routing architectures in the brain based on chemical markers guiding axon growth. The model produces all-to-all connectivity between given populations of input and output nodes using a minimum of cortical resources (links and intermediate nodes). The resulting structures are similar to architectures proposed in the literature, but with inter...

The colour gamuts of colour imaging media are important parameters in the reproduction of colour images between them and their assumed magnitudes directly influence the degree to which colours are modified. In spite of this, the determination of gamut boundaries is often done in a way that ignores some basic implications that follow from the definition of colour gamuts. This is partly due to th...

In a range of contexts, one comes across processes resembling inference, but where input propositions are not in general included among outputs, and the operation is not in any way reversible. Examples arise in contexts of conditional obligations, goals, ideals, preferences, actions, and beliefs. In a separate paper, we developed a general theory of such processes when they are applied without ...

We present two versions of a grid job submission system produced for the BaBar experiment. Both use globus job submission to process data spread across various sites, producing output which can be combined for analysis. The problems encountered with authorisation and authentication, data location, job submission, and the input and output sandboxes are described, as are the solutions. The total ...

The state space and input/output forillulatioils of inodel predictive control are compared and preference is given to the former because of the industrial interest in multivaria,ble constra,ined problems. Recently, by abaildoning the assumption of a finite output horizon several researchers lmve derived powerful stability results for linear and noillillear systems with and without constraints, ...

The problem of assessing the impact of firm entry and exit on aggregate productivity growth is addressed. The proposed method overcomes some problems with currently proposed methods. The paper also addresses some of the problems involved in aggregating outputs and inputs when firms enter and exit so that the one output and one input aggregate productivity decompositions can be applied. It turns...