Query Processing in Distributed Information Systems

1991 ◽  
Vol 15 (3-4) ◽  
pp. 381-397
Author(s):  
Zbigniew W. Ras
Keyword(s):  
Information System ◽  
Query Processing ◽  
Distributed System ◽  
Computer Network ◽  
Strong Impact ◽  
Information Structures ◽  
Distributed Information Systems ◽  
Distributed Information System ◽  
Distributed Information ◽  
A Site

In our model of a distributed information system, two information structures are maintained – the application database and the (routing) database used to route queries in a computer network. Any site of a distributed information system which does not understand some attribute values used in a query has to search for a site which can explain them. The information stored in routing database has a strong impact on the speed of this search. In [5], we propose that each site learns from its neighbors the descriptions of all unknown attribute values used in queries. These descriptions are represented in the form of rules and stored in dictionaries added to all sites of a distributed information system. This extended distributed system with dictionaries is called intelligent.

scholarly journals A Survey on Distributed Information Systems using Semantic Web Techniques

2019 ◽  
Vol 12 (1) ◽  
pp. 24-32
Author(s):  
Syed Farhan Mohsin, Syed Imran Jami
Keyword(s):  
Information System ◽  
Information Systems ◽  
Semantic Web ◽  
Theoretical Framework ◽  
Research Trends ◽  
Distributed Environment ◽  
Distributed Information Systems ◽  
Distributed Information System ◽  
Distributed Information

Semantic web is the growing field whose integration with Distributed Information System helps it in gluing technology. The framework of Semantic web deals with the representation, logic, rules and trust. We in this work surveyed the representation aspect of Semantic web by exploring ontologies proposed in various domains in the last three years. We observed that the research trends in semantic web for distributed information system is going in two directions i) theoretical framework ii) development of ontologies across different domains. We limited our work towards the domain of distributed information systems. Several detailed ontologies have been identified that are developed for integration with distributed information system across different domains. We conclude that ontologies need extensive work in its foundation, while more domains should be further explored in the development of robust information system in distributed environment.

scholarly journals Self-Organizing B2B Enterprise of Distributed Photogrammetric Processing of Terrain Images in ETRIS

2020 ◽  
pp. 155-179
Author(s):  
Oleg Karsaev ◽  
Igor Shuklin ◽  
Sergey Yushchenko
Keyword(s):  
Remote Sensing ◽  
Information System ◽  
Remote Sensing Data ◽  
Earth Remote Sensing ◽  
Distributed Information System ◽  
Distributed Information ◽  
Sensing Data ◽  
Geographically Distributed ◽  
Software Information ◽  
Self Organizing

An approach to the dynamic formation (adjustment) of schedules for distributed photogrammetric image processing in a network of ground centers included in the United geographically distributed information system for receiving and processing Earth remote sensing data from space is considered. Having the fullest satisfaction of requirements of consumers to the satellite images of necessary areas, the approach provides the formation of self-organizing B2B enterprises in the specified network providing information, software and hardware resources of the ground-based facilities of various departmental and other accessories for photogrammetric processing of any received images of the area from the the United geographically distributed information system. It is shown, that a search in B2B enterprise nodes and borrowing the required resources will allow ground centers to flexibly scale physical and virtual means of photogrammetric processing of Earth remote sensing data, quickly form their local structural and functional organizations depending on the current properties of the consumer requests flow for receiving Earth remote sensing data in the United geographically distributed information system, characteristics of the flow of terrain survey materials from orbital monitoring tools, and also take into account the visual and measuring properties of images of the area subject to photogrammetric processing. A method for truncating the set of potential performers of the application in accordance with the existing semantic and other restrictions on the composition of the desired set of performers is proposed. Also mechanisms to encourage ground centers to provide idle resources to B2B enterprise nodes are proposed. They are based on the possibility of receiving monetary or other remuneration from a ground center for participating in distributed application servicing. The development of a well-known model of a self-organizing B2B enterprise creates conditions for a more efficient organization of servicing the flow of applications in the United geographically distributed information system by attracting unused software, information and hardware resources of ground centers of various departmental affiliations.

Sign in / Sign up

Export Citation Format

Share Document