METU interoperable database system

and Sevgi Foundation, Turkey) is a multidatabase system based on OMG's (OMG is a registered trademark, and CORBA, ORB, OMG IDL, Object Request Broker are trademarks of OMG) distributed object management architecture. It is implemented on top of a CORBA compliant ORB, namely, DEC's ObjectBroker (ObjectBroker is a registered trademark of DEC Corp.) [DDO96]. In MIND all local databases are encapsulated in generic Database Object. The interface of the generic Database Object is de ned in CORBA IDL and multiple implementations of this interface, one for each component DBMSs, namely, Oracle7 (Oracle7 is a trademark of Oracle Corp.), Sybase (Sybase is a trademark of Sybase Corp.), Adabas D (Adabas D is a trademark of Software AG Corp.) and MOOD [Dog94] are provided. MIND provides its users a common data model and a single global query language based on SQL. The main functionalities of MIND are global query processing, global transaction management and schema integration. The basic component classes in the system are

iCARDEA: Practical Data Integration for the Follow-up of Cardiovascular Implantable Electronic Device Patients in Cardiology Departments

Abstrac

Genetic diversity of natural Cyclamen alpinum populations

The focus of this study was Cyclamen alpinum (formerly C. trochopteranthum). Habitat fragmentation, environmental degradation, and overharvesting of tubers have exerted pressure on native populations of this valuable ornamental species. Although the entire Cyclamen genus is in the Convention on International Trade in Endangered Species of Wild Fauna and Flora-Appendix II (CITES II), no species has yet been red-listed. Estimating the level and distribution of genetic variation in populations of rare and endemic species is important for conserving genetic diversity within a species in the context of well-developed conservation strategies. Currently, DNA markers are the most effective means used to infer genetic variation at the molecular level in conservation genetics. In this study, random amplified polymorphic DNA (RAPD) analysis was employed to assess the genetic diversity within and among 6 natural C. alpinum populations in the south and southwest of Turkey. A total of 190 loci were determined by using 15 polymorphic primers. Total genetic variation (H-T) was 0.27 +/- 0.02. A high proportion of this variation, 0.16 +/- 0.01 (59.26%), was due to within-population genetic variation (H-S). The genetic differentiation coefficient (G(ST)) was 0.41, and the level of gene flow (Nm) within a generation among the 6 populations studied was 0.73. As a result of these findings, we propose in situ combined with ex situ conservation of all C. alpinum populations. In addition, our results support prior recommendations to add C. alpinum to the International Union for Conservation of Nature and Natural Resources (IUCN) Red List under the critically endangered (CR) category

Design and implementation of a distributed workflow enactment service

Workflows are activities involving the coordinated execution of multiple tasks performed by different processing entities, mostly in distributed heterogeneous environments which are very common in enterprises of even moderate complexity. In current commercial workflow systems, the workflow scheduler is a single centralized component. A distributed workflow enactment service on the other hand should contain several schedulers on different nodes of a network each executing parts of process instances. Such an architecture would fit naturally to the distributed heterogeneous environments. Further advantages of distributed enactment service are failure resiliency and increased performance since a centralized scheduler is a potential bottleneck. In this paper we present the design and implementation of a distributed workflow enactment service based on the work given in [12]. Yet by starting with a block structured workflow specification language we avoid the very general set of dependencies and their related problems. In this way it is possible to present a simple algorithm for distributed scheduling of process instances. Further benefits of the approach are the ease in testing and debugging the system and execution efficiency through reduced number of messages.

Design and implementation of a distributed workflow management system: METUFlow

Workflows are activities involving the coordinated execution of multiple tasks performed by different processing entities, mostly in distributed heterogeneous environments which are very common in enterprises of even moderate complexity. Centralized workflow systems fall short to meet the demands of such environments

Multidatabase system implementation on CORBA

METU INteroperable DBMS (MIND) is a multidatabase system based on OMG's distributed object management architecture. It is implemented on top of a CORBA compliant ORB, namely, DEC's ObjectBroker. In MIND all local databases are encapsulated in a generic database object. The interface of the generic database object is defined in CORBA IDL and multiple implementations of this interface, one for each component DBMSs, namely, Oracle 7, Sybase, Adabas D and MOOD are provided. MIND provides its users a common data model and a single global query language based on SQL. The main components of MIND are a global query manager, a global transaction manager, a schema integrator, interfaces to supported database systems and a graphical user interface. The integration of export schemas is currently performed by using an object definition language (ODL) which is based on OMG's interface definition language. MIND global query optimizer aims at maximizing the parallel execution of the intersite operations of the global subqueries. Through MIND global transaction manager, the serializable execution of the global transactions (both nested and flat) is provided

A Multidatabase System Implementation on CORBA

METU INteroperable DBMS (MIND) is a multidatabase system based on OMG's distributed object management architecture. It is implemented ontop of a CORBA compliant ORB, namely, DEC's ObjectBroker. In MIND all local databases are encapsulated in a generic database object. The interface of the generic database object is de ned in CORBA IDL and multiple implementations of this interface, one for each component DBMSs, namely, Oracle7, Sybase, Adabas D and MOOD are provided. MIND provides its users a common data model and a single global query language based on SQL. The main components of MIND are aglobal query manager, a global transaction manager, a schema integrator, interfaces to supported databasesystemsandagraphical user interface. The integration of export schemas is currently performed by using an object de nition language (ODL) which is based on OMG's interface de nition language. MIND global query optimizer aims at maximizing the parallel execution of the intersite operations of the global subqueries. Through MIND global transaction manager, the serializable execution of the global transactions (both nested and at) is provided.