In a bi-racial country, it is desired that the numbers of government ministers from the two races should differ by at most one for fairness. Moreover, the numbers of pairs of ministries which interact directly with each other and both headed by ministers of one race should differ by at most one from that of the other race. One can naturally model the above social phenomenon by a graph labeling ...

The implementation of complex types in Object-Relational database systems requires the development of efficient access methods. In this paper we describe the RD-Tree, an index structure for set-valued attributes. The RD-Tree is an adaptation of the R-Tree that exploits a natural analogy between spatial objects and sets. A particular engineering difficulty arises in representing the keys in an R...

In this paper, difference sets in groups containing subgroups of index 2 are considered, especially group of order 2m where m is odd. The author shows that the only difference sets in groups of order 2p are trivial. The same conclusion is true for some special parameters.

Any vertex labeling f : V → {0, 1} of the graph G = (V,E) induces a partial edge labeling f ∗ : E → {0, 1} defined by f ∗(uv) = f(u) if and only if f(u) = f(v). The balance index set of G is defined as {|f ∗−1(0)− f ∗−1(1)| ∣∣ |f−1(0) − f−1(1)| ≤ 1}. In this paper, we propose a new and easier approach to find the balance index set of a graph. This new method makes it possible to determine the b...

In this paper, we propose a distance measure to evaluate visual similarity between two images. The algorithm searches for adaptive curvelet parameters that better represent a reference image. Next, the distance between the reference image and other images is computed as a weighted sum of distances between histograms of adaptive curvelet coefficients. The algorithm is tested on a data set of exe...

BACKGROUND Dengue is considered one of the most important vector-borne diseases in Thailand. Its incidence is increasing despite routine implementation of national dengue control programmes. This study, conducted during 2010, aimed to demonstrate an application of integrated, community-based, eco-bio-social strategies in combination with locally-produced eco-friendly vector control tools in th...

A graded partially ordered set is Eulerian if every interval has the same number of elements of even rank and of odd rank. Face lattices of convex polytopes are Eulerian. For Eulerian partially ordered sets, the flag vector can be encoded efficiently in the cd-index. The cd-index of a polytope has all positive entries. An important open problem is to give the broadest natural class of Eulerian ...