This paper focuses on issues related to implementing timed discrete-event systems (TDES) supervisors, and the concurrency and timing delay issues involved. In particular, we examine issues related to implementing TDES as sampled-data (SD) controllers. An SD controller is driven by a periodic clock and sees the system as a series of inputs and outputs. On each clock edge (tick event), it samples...

Any deformation of a Weyl or Clifford algebra can be realized through a change of generators in the undeformed algebra. q-Deformations of Weyl or Clifford algebrae that were covariant under the action of a simple Lie algebra g are characterized by their being covariant under the action of the quantum group Uhg , q := e h. We present a systematic procedure for determining all possible correspond...

The recently rigorously proved nonperturbative relation u = πi(F − a∂ a F /2), underlying N = 2 SYM with gauge group SU(2), implies the reflection symmetry u(τ) = u(−¯ τ). This symmetry is the key point to determine the moduli space of quantum vacua. It turns out that the functions a(u) and a D (u), which we derive from first principles, actually coincide with the solution proposed by Seiberg a...

Because of the unreasonable and unnecessary weight restriction assumption, a barely noticeable deficiency in pseudo-inefficiency occurs at times when applying a CCR model. The CCR was the first model designed for Data Envelopment Analysis (DEA); it remains its most popular model. To detect this type of unobvious deficiency, this study compared the following: the efficiency score and optimal wei...

Total mixed rations (TMRs) seem to be the feeding method of choice, at least for nongrazing situations (Spain et al., 1993). Despite the need for an extra piece of equipment (maybe more), the benefits in animal performance have been shown to far outweigh the costs of implementing the concept. The principles of TMRs caught on a few decades ago, but developments in the implementation and preparat...

Background: The rate of Helicobacter pylori (H.pylori) eradication in dyspeptic patients using bismuth- based triple therapy is low due to bacterial that are resistant to antibiotics. The results of recent studies regarding levofloxacin have been encouraging, but the high cost of treatment prevents its routine administration. We, therefore, performed the present double-blind clinical trial to c...

It is known that a Steiner triple system is projective if and only if it does not contain the four-triple configuration C14. We find three configurations such that a Steiner Electronic Notes in Discrete Mathematics 29 (2007) 17–21 1571-0653/$ – see front matter © 2007 Elsevier B.V. All rights reserved. www.elsevier.com/locate/endm doi:10.1016/j.endm.2007.07.004 triple system is affine if and on...

A Steiner triple system (more simply, triple system) is a pair T) where S is the vertex set of the complete undirected graph Kn on n vertices and T is a collection of edge-disjoint triangles (triples) which partition the edge set of Kn. The number n is called the order of the triple system (S, T) and it has been known forever since 1847 of triple systems (= set of all n such that a triple syste...