軟件體系結構信息共享體系結構sharedinformation-資料下載頁
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【導讀】風格的明顯特點是什么？這種這個風格有什么可研究的問題？復合多個數(shù)據(jù)庫；
【正文】 multiple hierarchies。 links between objects on same or different levels 分層；鏈接同層或不同層的對象 169。 38 2020/11/4 Control ? Objective: ? make knowledge sources respond opportunistically 讓知識源響應偶然事件 ? 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。 39 2020/11/4 Example： The Puzzle Metaphor 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。 41 2020/11/4 Hearsay II ? Complex blackboard system to deal with arbitrary speech recongition (a difficult problem): ? Ambiguity in segmentation（音節(jié)分割問題） : “Mary?s truck” versus “Mary struck” ? Ambiguity in stress（重音問題） : “disease” versus “dizzies” ? Ambiguity in grammar（語法問題） : “The horse raced past the barn fell” ? Ambiguity in semantics（語義問題） : “I saw the man on the hill with the binoculars” 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 黑板結構可以同時處理多種假設 ? Control was plex: had a monitor portion and a priority based scheduler 控制很復雜：有一個監(jiān)視器，采用基于優(yōu)先級的調(diào)度 169。 43 2020/11/4 Hearsay II Structure 169。 44 2020/11/4 Lecture Summary ? Repositories are ubiquitous in puterbased applications. 倉庫在計算機應用中幾乎無處不在 ? Shared information systems in many areas show similar trends, stimulated by similar technological and business pressures. 信息共享系統(tǒng)在很多領域有相似的發(fā)展趨勢，因為有相似的技術和商業(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域，其控制策略必須是機會主義的
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