Some questionso What are the appropriate control

philosophies for Complex Manufacturing systems?

Why????Holonic Manufacturing systemo Is Object -Oriented and / or Entity

relationship approach sufficient to establish a complex software engineering system?

o Are there any differences between Agent and Holon?

The Holonic concept

The Holonic idea is a new paradigm develop to organize activities and meet the agile, scalable ,robust and fault-tolerant requirements, overcomes many difficulties faced by existing convectional, rigid systems in manufacturing, offices etc.

Holonic idea or concept is not a method or a process but a philosophy. A guiding philosophy for effective and efficient way of getting a performance better than the traditional approaches in use today

This concept can be applied to our day to day life, activities as long as efficiency is needed to be measure. Holonic idea have been applied in offices, business, industry, university.

So, it becomes paramount for us to have a full understanding of this guiding philosophy for efficiency

HOLONIC PHILOSPHY

What are Holons?

It is a combination of holos (a greek

word meaning whole) and suffix on

(meaning particles or part)

A holon, as Koestler devised the term, is an identifiable part of a system that has a unique identity, yet is made up of sub-ordinate parts and in turn is part of a larger whole.

It is an autonomous and co-

operative building block of a

manufacturing system for

transforming, transporting, storing

and/or validating information and

physical objects.

Holon’s PropertiesAutonomy: the capability of an entity to create and control

the execution of its own plans and/or strategies

Co-operation: a process whereby a set of entities develops

mutually acceptable plans and executes these plans.

A holon self-regulates and respond to the environmental changes by using flexible strategies, and the changes are fed back to the center of its controller to continuously adjusts its course of action. The essential attributes of holons includes autonomy and cooperativeness

Holonic Systems

Holarchy: a system of holons that can co-operate to achieve a goal or objective. The holarchy defines the basic rules for co-operation of the holons and thereby limits their autonomy.

Holonic manufacturing system: a holarchy that integrates the entire range of manufacturing activities from order booking through design, production, and marketing to realize the agile manufacturing enterprise.

HOLONIC SYSTEMS

Cooperative relationships among holons

Comparison of holonic with other systems

Agent

In terms of origin, the agent can be defined as the amount of sub-classes which their combination establish the upper-class .

To exemplify, In manufacturing ,shops’(agent) combination make a bigger unit which is called Factory.

Agents have their roots in the computer science (artificial intelligence area) and the Holons in the computer integrated manufacturing domain, focusing on the problem associated with the flexible manufacturing systems

{

Agent

Agent It perceives the world in which it is situated. It has the capability of interacting with other agents. It is pro-active in the sense that it may take the initiative

and persistently pursues its own goals.

MAS : Multi-agent systemA collection of, possibly heterogeneous, computational

entities, having their own problem solving capabilities and which are able to interact in order to reach an overall goal.

MAS is seen as a system revealing a kind of synergy that would not be expected from the sum of its component agent.

Agents’ behavior

Coordination protocol b/w agent is nearly always derived from Contract Net (CNet)

Task Announcement

Bid Collection

Task offer submission

Task Commitment

Bid Evaluation

Task offer construction

Task Announcement monitoring

Bid Submission

Task offer reception

Task offer evaluation

Task offer acceptance

Bid construction

Customer Agent Server Agent

Agents’ behavior (2/2)Three classes of agent nodes.

Service Manager Node Service Provider Node Contractor Node

Task Announcement Receive bids Award bids

Manager

Potential Service ProvidersService Providers Contractor

Agent Technology

An intelligent agent is a software entity which exhibits, in some significant measure, autonomy, intelligence, and environmental awareness, and which interacts with its environment to achieve internal goals;

A multi-agent system (MAS) is a software system in which program modules (the individual agents) are given autonomy and intelligence and an underlining coordination mechanism (implementing rules for collaboration, like for holarchies) which enables collaboration between such modules (agents) to attain system objectives

Holons & Agent

The debate on clarifying the difference between holons and agents is an ongoing issue in the research communities. Given the essentially different path on which each concept was developed the question itself is inappropriate.

In response to the need for modeling the complexity of interactions in large scale Holonic systems, agent technology has emerged as a paradigm for structuring, designing and building software systems that require complex interactions between autonomous distributed Holons.

The agent paradigm models systems focusing on the underlining dynamics defined by the interactions between their parts. In contrast to the passive way in which objects communicate by invoking methods in one another in a way controlled externally by the user (e.g., from a ‘main’ program), agents are capable to initiate communication and decide (like a human) when and how to respond to external stimuli (e.g.,, manifested upon them as requests from other agents).

From this perspective the agent paradigm extends the object paradigm in that agents can be regarded as proactive objects that have an internal mechanism which governs their behavior enabling them to initiate action as well as to respond to the outside environment in an autonomous way.

Holons & AgentHolons & Agent

Thank you for your attention