Several aspects of canopy flow are investigated. The problem of steady flow in a horizontally infinite canopy under neutral thermal stratification is treated theoretically. The resulting analytical model is then used as a boundary condition for a nonlinear numerical model designed t o study transition regions near the leading and trailing edges of a canopy. This model shows a wave effect downst...

Convexity is important in several elds, and we have some theories on it. In this thesis, we discuss a kind of combinatorial convexity, in particular, antimatroids and convex geometries. An antimatroid is a combinatorial abstraction of convexity. It has some di erent origins; by Dilworth in lattice theory, by Edelman and Jamison in the notions of convexity, by Korte{Lov asz who were motivated by...

Optimized data transfer services are highly demanded nowadays, due to the large amounts of data which are frequently being produced and accessed. In this paper we consider several data transfer service optimization problems (optimal server location in path networks, optimal packet sequencing and minimum makespan packet scheduling), for which we provide novel algorithmic solutions.

In this paper we survey several aspects related to normal forms of hyperedge replacement grammars. Considering context free hyperedge replacement grammars we introduce, inspired by string grammars, Chomsky Normal Form and Greibach Normal Form. The algorithm of conversion is quite the same with the algorithm for string grammars. The important difference is related to the fact that hyperedge gram...

This paper deals with hypergroupoids obtained from n-ary relations. We give conditions for an n-ary relation such that the hypergroupoid associated with it is a hypergroup. First we analyze this construction using a ternary relation and then we generalize it for an n-ary relation.

While a large number of microbial species are capable of producing metal NPs, mechanism of nanoparticle biosynthesis is very important. The metabolic complexity of viable microorganisms complicates the analysis and identification of active species in the nucleation and growth of metal NPs. Strategies such as enzymatic oxidation or reduction, sorption on the cell wall and, in some cases, subsequ...

The separation of concerns, as a conceptual tool, enables us to manage the complexity of the software systems that we develop. A number of approaches have been proposed that aim at modularizing software around the natural boundaries of the various concerns, including subject-oriented programming (SOP) [Harrison & Ossher, 1993] aspect-oriented programming (AOP) [Kiczales et al., 1997], and our o...

While researchers have many intuitions about the differences between humancomputer and human-human interactions, most of these have not previously been subject to empirical scrutiny. This work presents some initial experiments in this direction, with the ultimate goal being to use what we learn to improve computer dialogue systems. Working with data from the air travel domain, we identified a n...