Session - 24 FUTURE DEVELOPMENT IN DISTRIBUTED DATABASE DISTRIBUTED EXPERT SYSTEM Matakuliah: M0184 / Pengolahan Data Distribusi Tahun: 2005 Versi:

OBJECTIVES Technological development in several areas which impact on future generations of distributed database system Extensive domains require larger knowledge bases DES approach

Characteristic Including deeper knowledge – reasoning for first principles – in addition to the shallower “compelled hindsight’ store typically as rules in conventional expert system Linking diverse expert system which have been developed in isolation from one another

Types OF DES HOPES  the Hierarchically Organized Parallel Expert System DVTB  Distant vehicle monitoring tested HECODES  Heterogeneous Cooperating Expert System

Modules of DES Task Assignment Decomposition assignment and solution followed by synthesis of solutions Collective deliberation, which issue are most important – proposed alternative solution – prioritizes solutions

Modules of DES Cont’d Organization Centralized Control Decentralized control Coordination Planning solution coordination and execution of the solution collaboration

Modules of DES Cont’d Learning Do we allow the control modules to learn from experiences Communication The interaction between node

DDBs Versus DESs DDBs Data factual and knowledge stores only Single answer to query Database system tend to neglect incompleteness problems in data It is unusual to find significant or extensive data replication Have global schema

DDBs Versus DESs DESs The agents composed of factual knowledge sources supplement No unique solution to a given problem Rule or facts may appear at several places in the network Have a local perspective, if problem can not be solved locally, it is passed to a ‘neighbor’ Dialogue can take place between agents

Distributed Expert System TASK Extract relevant information from the sampled signal Determine he velocity of the target Determine the distance from the target Monitor velocities of the target over some period Monitor the distance from receiver over a period