Designs and Perfect Codes
A Steiner triple system of order n (briefly STS(n)) is a family of 3-element blocks (subsets or triples) of the set N={1,2,..., n} such that each not ordered pair of elements of N appears in exactly one block. 
 
Two STS-s of order n are called isomorphic if there exists a permutation on the set N which transforms them into one another. It is well known that STS(n) exists if and only if n≡1 or 3 (mod 6).
There exist Steiner triple systems of order 15 that do not occur in a perfect binary one‐error‐correcting code
The codewords at distance three from a particular codeword of a perfect binary one‐error‐correcting code (of length 2m−1) form a Steiner triple system. It is a longstanding open problem whether every Steiner triple system of order 2m−1 occurs in a perfect code. It turns out that this is not the case; relying on a classification of the Steiner quadruple systems of order 16 it is shown that the unique anti‐Pasch Steiner triple system of order 15 provides a counterexample. © 2006 Wiley Periodicals, Inc. J Combin Designs 15: 465–468, 2007
The evaluation of the competency perception of inspectors in using new instructional technology
Abstract The purpose of this study is to find out the evaluation of inspectors in regards to their competency perceptions towards the use of new instructional technologies. This is a qualitative model research. The target population of this study consisted of 25 inspectors serving within the borders of TRNC in 2011. Data was collected by an “interview form” developed by the researcher. The interview form consisted of 6 items. Content analyze, frequency (f) and percentage (%) techniques were used to analyze the data. This research pointed out that: “concerns on falling behind the teacher”, “training needs”, “decreasing training support within the years” and “non existing policy on IT support” are critical factors affecting an inspector's competency perceptions in using new instructional technologies.