Corrigendum to: “The Prevalence of Internet Addiction and Its Relations to the Self Esteem and Life Satisfaction in Students of a Medical University”

Using internet has a growing popularity, especially among students. The aim of this study was to determine the prevalence of internet addiction and its relationship with the level of self esteem and life satisfaction in students of lorestan university of medical sciences in Iran. A cross-sectional study, with applying stratified sampling and then multi-stage cluster sampling method was performed. The sample size was 160. Four questionnaires (Demographic characteristics, Internet Addiction Test (IAT) by Dr. Kimberly Young, Rosenberg's Self esteem Scale and Diener’s Life Satisfaction Scale) were used to collect data, the software spss 16 was used for data analysis. Prevalence of internet addiction was 10%, and this problem was more prevalent in male students (P˂0.05). Moreover, there was a significant and adverse relation between internet addiction score and self esteem score (P=0.015), and life satisfaction score (P=0.012). There was a significant and direct relationship between life satisfaction and self esteem (P=0.001). Young people should be encouraged to use the internet as a more useful and efficient tool and become aware of the internet and its harmful effects.

The Relationship between Development Indices and Children’s Growth Among Under 12-Month-Old Children in Markazi Province, Iran

Background: The factors affecting children’s growth and development have been discussed in various research studies. This study evaluates the association between growth and development of under 12-month-old children in Iran.Methods: This cross-sectional study uses the Ages & Stages Questionnaire (ASQ) data and demographic characteristics in the child's health records of 15,885 Iranian children in Arak city up to March 2017. The impact of growth disorder, type of delivery, preterm birth, at birth weight/height/head circumference, gross motor, problem-solving, personal-social, communication, and fine motor on the participants’ head circumference/weight/height was assessed. Unadjusted analyses were done using independent sample t-test, Pearson correlation test and one-way analysis of variance. Multiple multivariate regression was utilized for adjusted effects. P-values less than 0.05 were considered statistically significant.Results: Head circumference was associated with growth disorder, type of delivery, and preterm birth. Children with known and unknown growth disorders had 610.19 and 160.58 grams less weight than those without any growth disorder. Gross motor and personal-social aspects of ASQ were found to be associated with weight at the age of 12-month old. Height at 12-months was affected by growth disorder, gross motor, personal-social, communication, and fine motor.Conclusion: Results of this study show that cesarean type of delivery, preterm birth, and low birth weight are the impacting factors associated with negative children growth trends and lower developmental status at the age of 12 months

Analysis of stress- strain distribution of dowel and glue line in L-type furniture joint by means of finite element method

In this study 3D stress-strain distribution of dowel and glue line on L-type joints made of plywood doweled was investigated. Members of joints made of 11-ply hardwood plywood (Hornbeam, Beech and Alder) that were 19 mm in thickness. In this study effect of beech dowels in three levels diameters (6, 8 and 10 mm) and penetration of depth (9, 13 and 17 mm) on bending moment capacity of L-type joints under compression loading was investigated as experimental test, then stress-strain distribution of wood dowel and glue line in specimens were simulated by means of ANSYS 15 software with finite element method (FEM).Results have shown that bending moment resistance increased with increasing dowel diameter from 6 to 8 mm, but downward trend was observed with increasing 8 to 10 mm in dowel diameter. Bending moment resistance increased with increasing penetration depth. Also, result obtained of simulation by means of ANSYS software have shown that stress-strain in dowel and glue line increased with increasing diameter of dowel and Increasing stress in joints made of diameter dowel 10 mm due to fracture in joints and decrease in resistance once. According to results obtained of model analysis, the ultimate stress of dowel and glue line occurred in the area that joints were contacted