Introduction: Internet addiction is increasing as a psycho physiological disorder with symptoms of tolerance and withdrawal symptoms, emotional disorders and social dysfunction among internet users. The purpose of this study is to answer the question of whether Internet addicts have more technology competence and capabilities or stereotype behavior. Methods and materials: This is a cross-sectio...

In this article we introduce the notion of n-capable groups. It is shown that every group G admits a uniquely determined subgroup (〖Z^n)〗^* (G) which is a characteristic subgroup and lies in the n-centre subgroup of the group G. This is the smallest subgroup of G whose factor group is n-capable. Moreover, some properties of n-central extension will be studied.

This paper proposes a new neocognitron that accepts incremental learning, without giving a severe damage to old memories or reducing learning speed. The new neocognitron uses a competitive learning, and the learning of all stages of the hierarchical network progresses simultaneously. To increase the learning speed, conventional neocognitrons of recent versions sacrificed the ability of incremen...