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Socially Intel. Agents Creating Rels. with Comp. & Robots - Dautenhahn et al (Eds) Part 15

Tham khảo tài liệu 'socially intel. agents creating rels. with comp. & robots - dautenhahn et al (eds) part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 264 Socially Intelligent Agents Figure 32.1. Graphical Specification of an Auction Scene One of the fundamental tasks of interagents is to ensure the legal exchange of illocutions among the agents taking part in some scene what can be said to whom and when. For this purpose interagents employ conversation protocols CP 4 . CPs define coordination patterns that constrain the sequencing of illocutions within a scene and allow to store and subsequently retrieve the contextual information illocutions previously sent or heard of ongoing scenes. We can think of CPs as scenes extended with the necessary actions to keep contextual information. Based on contextual information when receiving some illocution from an external agent to be transmitted an interagent can assess whether the illocution is legal or else whether it must be rejected or some enforcement rule activated. Consider the auction scene. A buyer agent receives the prices called by the auctioneer through his interagent which keeps track of the latest price called. When the buyer agent submits a bid his interagent collects it and verifies whether the buyer is bidding for the latest offer price. If so the interagent posts the bid to the auctioneer otherwise it s rejected. Once the bid has been submitted the buyer is not allowed to re-bid. If he tries their bids are disallowed and if he compulsively tries his interagent unplugs him from the institution. Then his interagent autonomously follow the required procedures to log the buyer out from the auction house. Interagents also constrain external agents behaviour in their transition between scenes. Figure 32.2 depicts the specification of the performative struc Enabling Open Agent Institutions 265 ture projection for buyer agents in FM96.5 the computational counterpart of the fish market. If some buyer requests his interagent for leaving the institution after making some acquisitions in the auction scene his interagent will refuse the request because the agent has .