軟件體系結(jié)構(gòu)信息共享體系結(jié)構(gòu)sharedinformation-閱讀頁
2024-10-18 09:31本頁面
【正文】 沒有唯一的解答，或者“正確”答案會變化 ? examples ?signal processing （信號處理） ?problem solving (planning, logistics, diagnostics) ?piler optimization 169。 37 2020/11/4 Blackboard Data Structure ? Objective: ? hold data for use by knowledge sources 保存知識源要使用的數(shù)據(jù) ? Representation: ? stores objects from solution space, including 保存來自解空間的數(shù)據(jù)，包括 ? input data, partial solutions, alternatives, final solutions, control data ? objects and properties define the terms of the discourse ? relationships are denoted by named links (“nextto”, “partof”) ? Organization: ? hierarchical, possibly multiple hierarchies。 38 2020/11/4 Control ? Objective: ? make knowledge sources respond opportunistically 讓知識源響應(yīng)偶然事件 ? Representation: ? keeps various sorts of information about which knowledge sources could operate and picks a sequence that allows the solution process to proceed a step at a time 了解各個知識源的能力，決策解決問題的步驟 ? Remark: ? the control mechanisms are thoroughly ad hoc 控制機制是徹底的與時俱進 169。 40 2020/11/4 Example： The Puzzle Metaphor ? Data within the blackboard is often structured hierarchically Level 4 assemble chunks Level 3 build chunks of edges build chunks of sky Level 2 collect edge pieces collect sky pieces Level 1 Turn all pieces picture side up 169。 42 2020/11/4 Problem Solving Strategy ? Had to be incremental, opportunistic, flexible 必須是增量的、機會的、靈活的 ? HearsayII employed several strategies: ? Bottomup (synthetic) ? Topdown (analytic) ? General hypothesizeandtest （猜測和測試） ? Blackboard structure entertained many simultaneous hypotheses 黑板結(jié)構(gòu)可以同時處理多種假設(shè) ? Control was plex: had a monitor portion and a priority based scheduler 控制很復(fù)雜：有一個監(jiān)視器，采用基于優(yōu)先級的調(diào)度 169。 44 2020/11/4 Lecture Summary ? Repositories are ubiquitous in puterbased applications. 倉庫在計算機應(yīng)用中幾乎無處不在 ? Shared information systems in many areas show similar trends, stimulated by similar technological and business pressures. 信息共享系統(tǒng)在很多領(lǐng)域有相似的發(fā)展趨勢，因為有相似的技術(shù)和商業(yè)壓力的激勵 ? Blackboards are specialized types of repositories for dealing with “messy” information processing domains where the control strategy must be opportunistic. 黑板是一種特別的倉庫，主要用于需要對凌亂的信息進行處理的領(lǐng)域，其控制策略必須是機會主義的
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