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Assessing the (in-)consistency of same-sex and opposite-sex peer nominations among Turkish elementary-school children
No full textNomination procedures for assessing peer behaviors are in wide use, and mixed-sex peer nominations are often utilized under the assumption that combined same-and opposite-sex nominations yield a representative picture of children's behaviors and relationships to other variables. Analyses of nominations made by 457 Turkish third and fifth graders for 14 peer behaviors and for liked-/disliked-a-lot illustrate the productiveness of separately assessing same-sex and opposite-sex nominations, showing that: (a) a bias toward more nominations for same-sex peers is not consistent over all behaviors; and (b) although same-sex and combined same-/opposite-sex nominations are strongly related, the agreement between same-and opposite-sex nominations is substantially Lower. The outcome is that (a) sociometric status classification depends on the nominating population and (b) the relationship between-peer-assessed behaviors and peer acceptance/peer sociometric status can differ; depending upon whether the reference group is same-or opposite-sex peers. Findings bring into question the routine use of mixed-sex nominations.Publisher's Versio
Feature extraction in shape recognition using segmentation of the boundary curve
No full textWe present a new method for feature extraction of two-dimensional shape information based on segmentation of the boundary curve. This approach partitions closed shapes into segments and finds their angular spans. The number of segments and the angular spans form the first two feature parameters of a given shape. Fourier coefficients of all segments constitute the final feature parameters. The algorithm renders the shapes independent of scale, rotation and translation, The main advantage of this method is to speed up substantially the recognition process of the shapes, mainly because it is possible to design the classification rule in a hierarchical way. It is therefore suitable for objects to be sorted in a factory environment where the silhouette boundary supplies sufficient information for identification.Publisher's Versio