Rosana Maria Mohallem Martins

Estilos cognitivos e personalidade: um estudo exploratório de evidências de validade

135 undergraduates, of both genders, were studied to explore validity evidences of a scale of cognitive styles in relation to personality traits. The two tests were collectively applied in classroom. The scale of cognitive styles assessed about the convergent, divergent, holist, serialist, reflexivity and impulsiveness styles; whereas the personality inventory of adjectives markers assessed the agreeableness, extraversion, conscientiousness, neuroticism, openness. Based on their definitions, nine correlations were expected to find among cognitive styles and personality traits. The obtained data did not show differences in the dimensions of cognitive style related to gender and age. Besides, 12 significant correlations were found, five of them confirming the hypotheses, but not the other ones. Although some validity evidences for the scale of cognitive styles have been detected, since some hypothesis were confirmed, the accomplishment of new researches is suggested to explore more that construct, considering both the theory and evidences of validity.

Expert system for the analysis of power quality

The use of capacitors for correcting the power factor is a very well known approach in industry. However, the increase of harmonic sources in power systems is heightening the risk of resonance and, consequently, a drastic decrease in electric power quality. In order to keep the rating voltage, the power factor, and the voltage and current harmonic distortions within acceptable limits, an expert system approach was implemented. Based on this approach, a software program that is able to decide about the optimal distribution of the capacitor banks has also been developed. The program decision is based on the rating voltage, the power factor, and the whole voltage and current harmonic distortions. When necessary, the computer program decides on the use of filters for harmonic compensation, indicating the best filter and the corresponding tuning frequency. Furthermore, the approach is able to deal with some aspects concerning the electric losses, both on the rating frequency and on the harmonic components.

Expert system for power quality improvement

The use of capacitors for correcting the power factor is a very well known approach in industry. However, the increase of harmonic sources in power systems is heightening the risk of resonance and, consequently, a drastic decrease in electric power quality. In order to keep the rating voltage, the power factor, and the voltage and current harmonic distortions within acceptable limits, an expert system approach was implemented. Based on this approach, a software program that is able to decide about the optimal distribution of the capacitor banks has also been developed. The program decision is based on the rating voltage, the power factor, end the whole voltage and current harmonic distortions. When necessary, the computer program decides on the use of filters for harmonic compensation, indicating the best filter and the corresponding tuning frequency. Furthermore, the approach is able to deal with some aspects concerning the electric losses, both on the rating frequency and on the harmonic components.

A new proposal to capacitor bank allocation using fuzzy logic

The use of capacitors for correcting the power factor is a very well known approach in industry. However, the increase of harmonic sources in power systems is heightening the risk of resonance and, consequently, a drastic decrease in electric power quality. In order to keep the rating voltage, the power factor, and the voltage and current harmonic distortions within acceptable limits, a fuzzy control approach was implemented. Based on this approach, a software program that is able to decide about the optimal distribution of the capacitor banks has also been developed. The program decision is based of the rating voltage, the power factor, and the whole voltage and current harmonic distortions. When necessary, the computer program decides on the use of filters for harmonic compensation, indicating the best filter and the corresponding tuning frequency. Furthermore, the approach is able to deal with some aspects concerning the electric losses, both on the rating frequency and on the harmonic components.

Contribution for the power quality control using fuzzy logic

The use of capacitors for correcting the power factor is a very well known approach in industry. However, the increase of harmonic sources in power systems is heightening the risk of resonance and, consequently, a drastic decrease in electric power quality. In order to keep the rating voltage, the power factor and the voltage and current harmonic distortions within acceptable limits, a fuzzy control approach was implemented. Based on this approach, a software program that is able to decide about the optimal distribution of the capacitor banks has also been developed. The program decision is based of the rating voltage, the power factor and the whole voltage and current harmonic distortions. When necessary, the computer program decides on the use of filters for harmonic compensation, indicating the best filter and the corresponding tuning frequency. Furthermore, the approach is able to deal with some aspects concerning the electric losses, both on the rating frequency and on the harmonic components.

A new computing structure for power quality analysis using fuzzy logic

The use of capacitors for correcting power factor is a very well known approach in industry. However, the increase of harmonic sources in power systems is heightening the risk of resonance and, consequently, a drastic decrease in electric power quality. In order to keep the rating voltage, the power factor and the voltage and current harmonic distortions within acceptable limits, a fuzzy control approach was implemented. Based on this approach, a software program that is able to decide on the optimal distribution of the capacitor banks has also been developed. The program decision is based of the rating voltage, the power factor and the whole voltage and current harmonic distortions. When necessary, the computer program derides on the use of filters for harmonic compensation, indicating the best filter and the corresponding tuning frequency. Furthermore, the approach is able to deal with some aspects concerning the electric losses, both on the rating frequency and on the harmonic components.

Validity evidence for the 4th edition of the Wechsler Intelligence Scale for Children

This study aimed to find validity evidence for the WISC-IV through the relationship with external variables, analyzing possible associations between the factor indexes of the WISC-IV and a Cloze test that assesses reading comprehension. We evaluated 150 children ages 6-14 years, from the 1st to the 9th grade level. The statistical technique of structural equation modeling was applied through the program Analysis of Moment Structures (AMOS). According to the results the factor index that best predicts reading comprehension is verbal comprehension, revealing a strong association with crystallized cognitive abilities. The results show validity evidence favorable to the WISC-IV interpretations, helping to bring it closer to more contemporary instruments in the assessment of intelligence as proposed by the CHC model.