In a state-of-the-art XML database, an XML query is evaluated as a sequence of structural joins in which positions of data nodes are used to perform each individual structural join. In this paper, we define the notion of social classes of data nodes and present a framework of query evaluation in which both positions and social classes of data nodes are used with structural joins to further impr...

Distance and online education is increasing in importance in the offerings of many universities. As this occurs, instructors are developing ways to use new media to support traditional teaching practices. This is an important effort, as online education is still viewed with a degree of skepticism by some. By successfully transferring accepted teaching practice into online education, instructors...

as a part of leisure time schedule education of art public has been carried out by public & private organizations and cultural institutions. not only leisure art learning will increase artistic skills and the familiarity with artistic styles but also sharing artistic experiences will increase teamwork skills, cultural collaborations and finally self-confidence. therefore, engaging in education ...

AIM To explore the nature of the social class gradient of cirrhosis mortality in England and Wales across the 20th century. METHODS Data on male cirrhosis mortality by social class were obtained from the Registrar General's Decennial Supplements for the years 1921-1991. Data for 1941 were not collected because of the second World War. RESULTS In 1921, cirrhosis mortality was substantially h...

the purpose of this research is study of effective factors on women motivations from watching serials persian-language satellite channel of gem (gem tv). this research depending on the type arrangement of variables and research goals in template of schemes correlation- comparative is foundation. the statistical population of this study is consisted of all women audience network series of gem (g...