Earticle

To solve the slow convergence speed, low precision in later period and tedious parameter setting of differential evolution when applied to complex optimization functions, an improved differential evolution algorithm (dn-DADE) based on dynamic adaptive strategy is proposed. Firstly, the elite solutions of current population are utilized in the new mutation strategy (DE/current-to-dnbest/1) to guide the search direction, and then these optional elite solutions tend to the global optimal solution in the late stage of evolution to balance the diversity of population and convergence speed. Secondly, the adaptive update strategies of scaling factor and crossover factor are designed for control parameter values self-adapting at different search stages, thus improve the stability and robustness of the algorithm. A set of 14 benchmark functions is adopted to test the performance of the proposed algorithm. The results show that dn-DADE algorithm has the advantages of remarkable optimizing ability, higher search precision, faster convergence speed and outperforms several state-of-the-art improved differential evolution algorithms in terms of the main performance indexes.

본 연구는 청소년기의 중학교 3학년 학생을 대상으로 부모의 양육방식이 휴대폰 의존도에 미치는 영향을 규명하고, 휴대폰 의존으로 인한 부정적, 긍정적인 효과를 규명하고자 하였다. 이를 위해 부모의 양육방식과 휴대폰 의존도, 자아존중감, 학교생활적응 간의 관계를 규명하기 위하여 2012 아동·청소년패널 자료를 활용하여 다중회귀분석을 실시하였다. 그 결과 긍정적 양육방식은 청소년의 휴대폰 의존도를 낮추는 효과가 있는 반면, 부정적 양육방식은 휴대폰의존도를 높이는 것으로 밝혀졌다. 또한 휴대폰 의존도는 자아존중감을 낮추고, 학교생활적응에 부정적 영향을 미치는 것으로 밝혀졌다. 이에 본 연구에서는 긍정적 부모양육방식과 청소년의 올바른 휴대폰 사용을 위한 교육프로그램의 필요성을 제시하고자 하였다.

The purpose of this study is to investigate the influence of parent rearing methods on mobile phone dependence with subjects being middle school students in their early adolescent age and to investigate the negative effects brought by mobile phones. For this, in order to investigate the relationship among parental rearing method, mobile phone dependence, self-esteem and school adaptation, the 2010 Teenagers panel data was utilized to conduct a multiple regression analysis. As a result, a controlled rearing method which is one of the negative parental rearing methods demonstrated a high dependence on mobile phones while a supervised rearing method which is one of the positive parental rearing methods indicated low mobile phone dependence. In addition, the mobile phone dependence lowered self-esteem and showed to have negative influences on school adaptation. Thus, this study proposes the need for positive parental rearing methods and an educational program targeting the correct use of mobile phones for teenagers.