軟件體系結(jié)構(gòu)信息共享體系結(jié)構(gòu)sharedinformation-資料下載頁(yè)
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【導(dǎo)讀】風(fēng)格的明顯特點(diǎn)是什么？這種這個(gè)風(fēng)格有什么可研究的問題？復(fù)合多個(gè)數(shù)據(jù)庫(kù)；
【正文】 multiple hierarchies。 links between objects on same or different levels 分層；鏈接同層或不同層的對(duì)象 169。 38 2020/11/4 Control ? Objective: ? make knowledge sources respond opportunistically 讓知識(shí)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(gè)知識(shí)源的能力，決策解決問題的步驟 ? Remark: ? the control mechanisms are thoroughly ad hoc 控制機(jī)制是徹底的與時(shí)俱進(jìn) 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(yǔ)法問題） : “The horse raced past the barn fell” ? Ambiguity in semantics（語(yǔ)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(jī)會(huì)的、靈活的 ? HearsayII employed several strategies: ? Bottomup (synthetic) ? Topdown (analytic) ? General hypothesizeandtest （猜測(cè)和測(cè)試） ? Blackboard structure entertained many simultaneous hypotheses 黑板結(jié)構(gòu)可以同時(shí)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(gè)監(jiān)視器，采用基于優(yōu)先級(jí)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(cāng)庫(kù)在計(jì)算機(jī)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(shì)，因?yàn)橛邢嗨频募夹g(shù)和商業(yè)壓力的激勵(lì) ? 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(cāng)庫(kù)，主要用于需要對(duì)凌亂的信息進(jìn)行處理的領(lǐng)域，其控制策略必須是機(jī)會(huì)主義的
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