We address the problem of answering queries over a distributed information system, storing objects indexed by terms organized in a taxonomy. The taxonomy consists of subsumption relationships between negation-free DNF formulas on terms and negation-free conjunctions of terms. In the first part of the paper, we consider the centralized case, deriving a hypergraph-based algorithm that is efficien...

the purpose of the study was to identify and prioritize the educational needs and support needed by agricultural extension agents in isfahan, islamic republic of iran. the target population for the study consisted of s3 agricultural extension agents in isfahan province. census population were used therefore, sampling procedures were not utilized and genera i izability of the results was lim...

the main purpose of this research was to investigate the factors influencing on computer attitudes of agricultural extension agents. the target population consisted of all extension agents of agricultural engineering and council services companies in kermanshah township (n= 85).  a sample of 70 agents was selected through a stratified random sampling. based on the results, the majority of agent...

  According to statistics released by agricultural insurance fund (AIF) less than 4 million acres out of 90 million acres has been covered by Pastures Insurance. This observation along with several facts motivated authors to study possible barriers which Pastures Insurance has been encountered in practice. The research population included all the experts in agricultural insurance fund. Small po...

the state agricultural extension system (saes) due to serious limitations of finance, equipment and staff could not meet all the expectation of the farmers. use of unemployed young graduates' services as consultant, farm manager or farm supervisor has been considered as a solution to the problem and as an alternative, in recent years. this research was aimed at an evaluation of the extensi...

this study aimed at identifying required competencies for the labor market by the graduates majoring in the agricultural extension education field. the study population included undergraduates, faculty members, and employers, as related to bachelor level in three extension and education departments at bu ali sina, tehran, and shiraz universities of iran. the study has employed both quantitative...

financial markets are considered because of their role in acquiring small and large savings of national economy, optimizing the flow of financial resources and distributing these resources to consumption and investment needs of economic sectors. the aim of this study was investigating the influence of financial market extension on agriculturalsector’s development of kohgilouye and boyer ahmad p...