发布求助
文献互助 智能选刊 最新文献

Workshop on Data Abstraction, Databases and Conceptual Modelling最新文献

筛选
英文 中文
Default reasoning and inheritance mechanisms on type hierarchies 类型层次结构上的默认推理和继承机制
Workshop on Data Abstraction, Databases and Conceptual Modelling Pub Date : 1981-02-01 DOI: 10.1145/800227.806889
J. Carbonell
{"title":"Default reasoning and inheritance mechanisms on type hierarchies","authors":"J. Carbonell","doi":"10.1145/800227.806889","DOIUrl":"https://doi.org/10.1145/800227.806889","url":null,"abstract":"Type hierarchies abound in Artificial Intelligence, Data Bases and Programming Languages. Although their size, use and complexity differs, all share a central inference mechanism: Inheritance of information, their raison d'etre. This paper discusses various types of type hierarchies and inheritance mechanisms, concluding with a proposed generalized inheritance mapping approach to resolve issues of lateral and upward inheritance (to augment the traditional downward approach), as well as default reasoning and limited non-monotonic inference.","PeriodicalId":347815,"journal":{"name":"Workshop on Data Abstraction, Databases and Conceptual Modelling","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115569813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 26
Data dictionaries in open system communication 开放系统通信中的数据字典
Workshop on Data Abstraction, Databases and Conceptual Modelling Pub Date : 1981-02-01 DOI: 10.1145/960128.806899
P. Hitchcock
{"title":"Data dictionaries in open system communication","authors":"P. Hitchcock","doi":"10.1145/960128.806899","DOIUrl":"https://doi.org/10.1145/960128.806899","url":null,"abstract":"My current work is based on the premise that one should be able to access a foreign database system with the same ease that one can move from one type of telephone system to another. Data dictionaries must form the focal point in any architecture which would support such a concept. Data from a foreign system must be presented to the local system in such a way that the local system can understand it if the databases are disjoint, or merge the foreign conceptual model with the local one if the data bases have some common structure. Once such a rapport has been established, other aspects of the conceptual models, such as constraints and operations on the data, must be translated from one system to the other. This raises the following issues which I would like to see discussed at the workshop.","PeriodicalId":347815,"journal":{"name":"Workshop on Data Abstraction, Databases and Conceptual Modelling","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116740345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Relativism and views in a conceptual data base model 概念数据库模型中的相对主义和视图
Workshop on Data Abstraction, Databases and Conceptual Modelling Pub Date : 1981-02-01 DOI: 10.1145/800227.806902
Peter Kreps
{"title":"Relativism and views in a conceptual data base model","authors":"Peter Kreps","doi":"10.1145/800227.806902","DOIUrl":"https://doi.org/10.1145/800227.806902","url":null,"abstract":"The purpose of the Pingree Park Workshop was to bring together practitioners from the fields of Artificial Intelligence (AI), Database Management (DB), and Programming Languages (PL), to discover common issues, and to explore commonalities and differences in approaches to these issues. At the risk of being superficial let me try to summarily characterize the three fields and point to where I think they may fruitfully interact.\u0000 It seems to me that at its best, AI is an interdisciplinary science of cognition. It attempts to understand the bases for natural cognition, primarily by developing models of structures and processes that underlie cognition. By incorporation into interactive systems these models can be both exploited as artificially intelligent technology and explored for their adequacy in explaining natural cognition.","PeriodicalId":347815,"journal":{"name":"Workshop on Data Abstraction, Databases and Conceptual Modelling","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116184580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Associating types with domains of relational data bases 将类型与关系数据库的域相关联
Workshop on Data Abstraction, Databases and Conceptual Modelling Pub Date : 1981-02-01 DOI: 10.1145/800227.806903
M. Lacroix, A. Pirotte
{"title":"Associating types with domains of relational data bases","authors":"M. Lacroix, A. Pirotte","doi":"10.1145/800227.806903","DOIUrl":"https://doi.org/10.1145/800227.806903","url":null,"abstract":"In the DB field, there are two interpretations (or perceptions or schools of thought) concerning the relational model: (a) one interpretation considers that the relational model contribution to the DB field essentially consists in the presentation of a clear and simple notion of (flat) file, and that many users will be very satisfied to describe their data structures as tables; (b) another interpretation considers the relational model as a (reasonable) support for a (weak) entity relationship model.","PeriodicalId":347815,"journal":{"name":"Workshop on Data Abstraction, Databases and Conceptual Modelling","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129671127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Mediating the views of databases and database users 中介数据库和数据库用户的视图
Workshop on Data Abstraction, Databases and Conceptual Modelling Pub Date : 1981-02-01 DOI: 10.1145/800227.806898
G. Hendrix
{"title":"Mediating the views of databases and database users","authors":"G. Hendrix","doi":"10.1145/800227.806898","DOIUrl":"https://doi.org/10.1145/800227.806898","url":null,"abstract":"The Natural-Language/Deduction group at SRI International has undertaken several large projects integrating knowledge representation, the modeling and use of distributed conventional databases, logical deduction, and natural-language processing. One of the largest projects, LADDER [2], involved accessing data distributed over a computer network by using queries expressed in English. Work with LADDER (and several similar systems) has revealed that:\u0000 (1) Users wish to talk about data in terms of the enterprise in which the data are to be used. Users do not confine their questions to concepts and terminology covered by the database per se.\u0000 (2) Users are seldom satisfied with access only to the data in a database. They need to know the KIND of data available (i.e., they want to ask questions about the DB schema), and they expect systems to include information that can be computed from “common knowledge” and information stored explicitly in the database (e.g., if a database records where two ships are, users expect the system to know the distance between them).\u0000 (3) Users are not satisfied with access to an existing database. They want to tell the system new facts. Some of these are not suitable for storage in conventional databases (e.g., statements involving quantification), and some involve counter factuals (e.g., “Suppose the ship were 100 miles south of its current location...”).\u0000 (4) Given natural-language access to a DBMS, users expect to interact in natural language with other types of software, too. Moreover, they expect the various underlying software packages to understand one another's results (e.g., User: “Who is the commander of the ship?” System: “Admiral Brown.” User: “Send him a copy of Smith's memo.” The mailer is expected to understand the output from the database).","PeriodicalId":347815,"journal":{"name":"Workshop on Data Abstraction, Databases and Conceptual Modelling","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124737852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Some contrasts and considerations of an approach to modelling 建模方法的一些对比和考虑
Workshop on Data Abstraction, Databases and Conceptual Modelling Pub Date : 1981-02-01 DOI: 10.1145/800227.806894
M. Feather
{"title":"Some contrasts and considerations of an approach to modelling","authors":"M. Feather","doi":"10.1145/800227.806894","DOIUrl":"https://doi.org/10.1145/800227.806894","url":null,"abstract":"We consider the approach to modelling that our group has been developing, first to highlight differences between this and the approaches of other researchers, second to raise some issues related to understandability of models that we feel are common to modelling in general. The principles underlying our approach may be found in Balzer's position paper to this workshop.","PeriodicalId":347815,"journal":{"name":"Workshop on Data Abstraction, Databases and Conceptual Modelling","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115349566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Incompleteness in knowledge bases 知识库不完整
Workshop on Data Abstraction, Databases and Conceptual Modelling Pub Date : 1981-02-01 DOI: 10.1145/960128.806905
H. Levesque
{"title":"Incompleteness in knowledge bases","authors":"H. Levesque","doi":"10.1145/960128.806905","DOIUrl":"https://doi.org/10.1145/960128.806905","url":null,"abstract":"The first topic for discussion at the High Level Abstraction Workshop was\u0000 What should be modelled?\u0000 that is, what aspects of the world (slice of reality / enterprise) must be dealt with in a high level conceptual model. I would like to address this question from the point of view of incomplete knowledge bases. Although my remarks pertain mainly to AI applications, I suspect that any application using an information system of some sort will eventually have to face similar issues.\u0000 The knowledge bases required in many applications can be characterized by a lack of complete information about the world of interest.","PeriodicalId":347815,"journal":{"name":"Workshop on Data Abstraction, Databases and Conceptual Modelling","volume":"28 36","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133425149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Data abstraction from a programming language viewpoint 从编程语言的角度看数据抽象
Workshop on Data Abstraction, Databases and Conceptual Modelling Pub Date : 1981-02-01 DOI: 10.1145/800227.806873
L. Rowe
{"title":"Data abstraction from a programming language viewpoint","authors":"L. Rowe","doi":"10.1145/800227.806873","DOIUrl":"https://doi.org/10.1145/800227.806873","url":null,"abstract":"This paper traces the development of data abstraction concepts in programming languages. A data abstraction, or abstract data type, describes a collection of abstract entities and operations on the entities. A program which uses a data abstraction can access or modify the entities only through the abstract operations.\u0000 Specific research topics discussed in the paper include: the role of type in a programming language, the formal specification of the semantics of a data abstraction, data abstraction language construct design issues, type hierarchies, and type-checking.","PeriodicalId":347815,"journal":{"name":"Workshop on Data Abstraction, Databases and Conceptual Modelling","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131423081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Heterogeneous databases and high level abstraction 异构数据库和高级抽象
Workshop on Data Abstraction, Databases and Conceptual Modelling Pub Date : 1981-02-01 DOI: 10.1145/800227.806900
R. Katz
{"title":"Heterogeneous databases and high level abstraction","authors":"R. Katz","doi":"10.1145/800227.806900","DOIUrl":"https://doi.org/10.1145/800227.806900","url":null,"abstract":"A heterogeneous database management system combines multiple dissimilar models of data within a single integrated system. The objective is to allow a user to access data independently of how it is actually organized. For example, a user may access a database as though it were stored relationally (i.e., in tables) [CODD70], even though it is actually stored as a CODASYL/DBTG or network database [CODA71]. In addition, different subpieces of the database may be organized under different data models. The heterogeneous database system must present these to the user as an integrated whole. The user's model of his data may be different from any of the models chosen to implement it.\u0000 Rather than construct a new database system from scratch, we are interested in constructing a heterogeneous system out of existing systems. The key difficulties with this approach are: (1) the formulation of database design methods that are applicable to a variety of different data models, and (2) the development of techniques to translate programs and data between dissimilar data models. In this paper, we briefly describe how high level abstraction has been applied to these problems. The use of abstraction in database systems is related to the application of abstraction techniques in programming languages and artificial intelligence research.","PeriodicalId":347815,"journal":{"name":"Workshop on Data Abstraction, Databases and Conceptual Modelling","volume":"13 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114130481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Abstraction, data types, and models for software 软件的抽象、数据类型和模型
Workshop on Data Abstraction, Databases and Conceptual Modelling Pub Date : 1981-02-01 DOI: 10.1145/800227.806918
M. Shaw
{"title":"Abstraction, data types, and models for software","authors":"M. Shaw","doi":"10.1145/800227.806918","DOIUrl":"https://doi.org/10.1145/800227.806918","url":null,"abstract":"In the area of software development and maintenance, a major issue is managing the complexity of the systems. Programming methodologies and languages to support them have grown in response to new ideas about how to cope with this complexity. A dominant theme in the growth of methodologies and languages is the development of tools dealing with abstractions. An abstraction is a simplified description, or specification, of a system that emphasizes some of its details or properties while suppressing others. A good abstraction is one in which information that is significant to the reader (i.e., the user) is emphasized while details that are immaterial, at least for the moment, are suppressed.\u0000 What we call “abstraction” in programming systems corresponds closely to what is called “modelling” in many other fields. It shares many of the same problems deciding which characteristics of the system are important, what variability (i.e., parameters) should be included, which descriptive formalism to use, how the model can be validated, and so on","PeriodicalId":347815,"journal":{"name":"Workshop on Data Abstraction, Databases and Conceptual Modelling","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1981-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117189121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信