Engineering data are separately organized and their schemas are increasingly complex and variable. Engineering data management systems are needed to be able to manage the unified data and to be both customizable and e...Engineering data are separately organized and their schemas are increasingly complex and variable. Engineering data management systems are needed to be able to manage the unified data and to be both customizable and extensible. The design of the systems is heavily dependent on the flexibility and self-description of the data model. The characteristics of engineering data and their management facts are analyzed. Then engineering data warehouse (EDW) architecture and multi-layer metamodels are presented. Also an approach to manage anduse engineering data by a meta object is proposed. Finally, an application flight test EDW system (FTEDWS) is described and meta-objects to manage engineering data in the data warehouse are used. It shows that adopting a meta-modeling approach provides a support for interchangeability and a sufficiently flexible environment in which the system evolution and the reusability can be handled.展开更多
The Self-description Questionnaire-I(SDQ-I)is a multidimensional instrument that measures eight self-concept facets hypothesized in Shavelson’s hierarchical model.This study investigated self-concept in a sample of P...The Self-description Questionnaire-I(SDQ-I)is a multidimensional instrument that measures eight self-concept facets hypothesized in Shavelson’s hierarchical model.This study investigated self-concept in a sample of Palestinian adolescent students using an Arabic version of the SDQ-I.Three-hundred sixty adolescents(163 girls and 197 boys)aged 13 to 16 years(M=14.3,SD=.87)participated.The 72-item SDQ-I was administered in four Palestinian schools to assess the psychometric properties of the SDQ-I.This included the factor structure and the internal consistency reliability of the SDQ-I subscales and mean score responses of Palestinian self-concept.Factor analysis results,which accounted for the majority of the variance,supported an underlying general self-concept factor structure that demonstrated the eight factors that the SDQ-I is designed to measure.This is consistent with previous studies in similar age groups and the SDQ-I reliabilities were similar to those reported in the literature.Students perceived total self-concept positively(mean=3.71).Three facets of self-concept(parent relations,reading,and general self-concept)indicated high positive self-concept.Correlations among the different dimensions were consistent with the hierarchical structure in Shavelson’s model.Overall,the findings provided compelling support for Shavelson’s model,and the structure validity of Western self-concept measure.Interpretations were provided for the discrepancies regarding the Palestinian-Arab culture.展开更多
文摘Engineering data are separately organized and their schemas are increasingly complex and variable. Engineering data management systems are needed to be able to manage the unified data and to be both customizable and extensible. The design of the systems is heavily dependent on the flexibility and self-description of the data model. The characteristics of engineering data and their management facts are analyzed. Then engineering data warehouse (EDW) architecture and multi-layer metamodels are presented. Also an approach to manage anduse engineering data by a meta object is proposed. Finally, an application flight test EDW system (FTEDWS) is described and meta-objects to manage engineering data in the data warehouse are used. It shows that adopting a meta-modeling approach provides a support for interchangeability and a sufficiently flexible environment in which the system evolution and the reusability can be handled.
基金The researchers would like to acknowledge the contributions of participating schools in their data collection and volunteering students for kindly taking part in this study.
文摘The Self-description Questionnaire-I(SDQ-I)is a multidimensional instrument that measures eight self-concept facets hypothesized in Shavelson’s hierarchical model.This study investigated self-concept in a sample of Palestinian adolescent students using an Arabic version of the SDQ-I.Three-hundred sixty adolescents(163 girls and 197 boys)aged 13 to 16 years(M=14.3,SD=.87)participated.The 72-item SDQ-I was administered in four Palestinian schools to assess the psychometric properties of the SDQ-I.This included the factor structure and the internal consistency reliability of the SDQ-I subscales and mean score responses of Palestinian self-concept.Factor analysis results,which accounted for the majority of the variance,supported an underlying general self-concept factor structure that demonstrated the eight factors that the SDQ-I is designed to measure.This is consistent with previous studies in similar age groups and the SDQ-I reliabilities were similar to those reported in the literature.Students perceived total self-concept positively(mean=3.71).Three facets of self-concept(parent relations,reading,and general self-concept)indicated high positive self-concept.Correlations among the different dimensions were consistent with the hierarchical structure in Shavelson’s model.Overall,the findings provided compelling support for Shavelson’s model,and the structure validity of Western self-concept measure.Interpretations were provided for the discrepancies regarding the Palestinian-Arab culture.
