Concordia University

About: Concordia University is a education organization based out in Montreal, Quebec, Canada. It is known for research contribution in the topics: Context (language use) & Control theory. The organization has 13565 authors who have published 31084 publications receiving 783525 citations. The organization is also known as: Sir George Williams University & Loyola College, Montreal.

Sticking it all together: A critical assessment of the group cohesion–performance literature

Abstract: Although group cohesion is a widely studied construct in the group dynamics literature, there is a considerable lack of consistency and agreement regarding the construct. This paper reviews the current state of the cohesiveness literature. Cohesion is now generally defined as the group members’ inclinations to forge social bonds, resulting in the group sticking together and remaining united. Unfortunately, the large number of definitions and measures used by researchers has created a literature that is inconsistent and confusing. This review focuses on the considerable research on the cohesion–performance relationship. The general consensus of this research is that there is a generally positive association between cohesion and performance, but the theoretical and operational mechanisms creating this association are unclear. This lack of clarity may be due to the wide range of measures and assessments of cohesion and the cohesion–performance association. Two underlying contentious issues within this aspect of the literature are whether cohesion is unidimensional or multidimensional and the appropriate level of analysis required for measuring the construct. The resolution of these inconsistencies requires researchers to take a step back toward grounding the research in broader theoretical frameworks, to determine whether the cohesion–performance association has an underlying common cause, and to use longitudinal studies that use more sophisticated analytical models.

Design aspects of synchronous PWM rectifier-inverter systems under unbalanced input voltage conditions

Abstract: A complete analysis of a synchronous front-end PWM rectifier-inverter system under unbalanced input voltage conditions is presented. The analysis includes the harmonic assessment of input/output current and voltage waveforms. It is shown both theoretically and experimentally that input voltage unbalance generates uncharacteristic low-frequency harmonic components in the input and output currents. Special emphasis is given to the generation of a DC component in the inverter output voltage in the case in which the output frequency is twice the input frequency. System design curves for different degrees of unbalance for all major system components are reported. Key predicted results are confirmed experimentally. >