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KET Analytical Servers

KET analytical server is a form of implementation of KET functionality. The algorithmic basis for servers is the same as for modules. Servers are different types of executables that can be viewed as stand-alone applications and also can provide additional functionality to other applications.

Below we consider three levels of sophistication of an architecture that can employ one or more servers.

Simple Architectures

One of simple server based architectures consists of one server and one application that sends requests to the server. In this case, the main purpose of using server is to be able to add KET functionality to applications.

The new application hosting the client will consist of the old application (which becomes a client), one of KET servers and a KET interface. The interface may consist of procedural style calls to server functions or it may use one of KET 4GL interpreters.

An additional motivation to use the architecture shown above is a multi-platform implementation where client and server may reside on a different platforms. In this case the interface will consist of a communication channel and a request interpreter. The latter more frequently resides on the server platform.

One special type of architecturally simple applications using KET servers is the case when the client is just a front end for the server. It is reasonable either when  KET functionality covers all needs except GUI representation or when the main purpose is to conduct KET-based interactive experiments.  

Complex Architectures: Virtual Databases, Agents, Distributed Applications

When KET interprets uses data, it works under the paradigm of a "virtual database". It means that neither KET assumes that input comes from a relational database, nor even existence of data is taken for granted. Instead, KET input is based on KET requests, which are transferred to a resource-aware entity providing knowledge how to get data. This knowledge may be in a particular case related to a database storage, it may be URL pointing to non-relation sources, and it may even a command to start data collection (e.g., measurements). In the latter case (natural for industrial applications) data do not even exist at the moment of request.

This approach is compatible with "the resource definition initiative" of W3C organization and allow very convenient description in terms of frame systems.

There are many possibilities to implement resource finder. One of ways is to employ KET agents, which are stand-alone applications capable of working as a KET server as well collecting information an their own.

One example of this type of architecture is shown in the picture below.

The client part of the application (C) communicates with agents (A) via an interface, which is typically a network. Agents collect information via another interface (e.g., the Internet) by using KET servers. They are working not only by the initiative of the client, but  may operate on their own. At the same time, when requests come form the client they respond correspondingly by using collected information or going to the search mode if collected information is not sufficient to satisfy the request.

In this particular example five servers are used: two of them are agents and three are "strict" servers.

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  New feature !!

A new KET module was introduced recently to support interaction with "Mathematica 8" system.

 

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KET, LLC joined BioMed Content Group, Inc. in initiative of using AI agents to facilitate work of physicians and educators.

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