82 research outputs found
An XML-Enabled Association Rule Framework
No full textWith the sheer amount of data stored, presented and exchanged using XML nowadays, the ability to extract knowledge from XML data sources becomes increasingly important and desirable. This paper aims to integrate the newly emerging XML technology with data mining technology, using association rule mining as a case in point. Compared with traditional association mining in the well-structured world (e.g., relational databases), mining from XML data is faced with more challenges due to the inherent flexibilities of XML in both structure and semantics. The primary challenges include 1) a more complicated hierarchical data structure; 2) an ordered data context; and 3) a much bigger data size. To tackle these challenges, in this paper, we propose an extended XML-enabled association rule framework, which is flexible and powerful enough to represent both simple and complex structured association relationships inherent in XML data
XML Views: Part 1
No full textThe exponential growth and the nature of Internet and web-based applications made eXtensible Markup Language (XML) as the de-facto standard for data exchange and data dissemination. Now it is gaining momentum in replacing conventional data models for data representation. XML with its self-describing hierarchical structure and its associated XML Schema (XSD), provide the flexibility and manipulative power needed to accommodate distributive, heterogeneous data. But due to XML's non-scalar, set-based semi-structured nature and ambiguity, traditional data design models lack the capability to conceptually model, design and successfully implement a data model. Due to this, organising and extracting information of XML documents with their conceptual and operational semantics intact is still a challenging task. In this paper, we propose a generic, language independent conceptual view mechanism for XML documents (XML View) to enhance conceptual modelling and designing capabilities of XML based information systems. We focus view definition at the conceptual level and the semantics required in accommodating such view mechanism at this higher level of abstraction
A Lesson for Software Engineering from Knowledge Engineering
No full textKnowledge engineering has developed fine tools for maintaining the integrity of knowledge bases. These tools may be applied to the maintenance of conventional programs particularly those programs in which business rules are embedded. A unified model of knowledge represents business rules at a higher level of abstraction than the rule-based paradigm. Representation at this high level of abstraction enables any changes to business rules to be quantified and tracked through to the imperative programs that implement them. Further, methods may be applied to simplify the unified model so that the maintenance of the imperative implementation too is simplified
Toward the Design of Adaptive Instructions and Help for Knowledge Communication with the Problem Solving Monitor ABSYNT
No full textThis paper offers contributions to CAI and ICAI in the framework of the problem solving monitor (PSM) ABSYNT. Our system - a special variant of an ITS - is designed with respect to a sequence of programming tasks in the visual functional computer language ABSYNT (ABstract SYNtax Trees). It provides the learner with a friendly environment including a help but no curricular component.
First, we show that conventional instructions and help can be improved by using existing AI methodology, visualization of information and cognitive modelling to make them adaptive to the knowledge state of the user. Second, we demonstrate the improvement of ICAI by an interactive help system which supports planning tasks of the user. It checks
hypotheses postulated by the user, and gives feedback concerning incomplete proposals
Moa and the Multi-model architecture: a new perspective on XNF 2
No full textAdvanced non-traditional application domains such as geographic information systems and digital library systems demand advanced data management support. In an effort to cope with this demand, we present the concept of a novel multi-model DBMS architecture which provides evaluation of queries on complexly structured data without sacrificing efficiency. A vital role in this architecture is played by the Moa language featuring a nested relational data model based on XNF2 , in which we placed renewed interest. Furthermore, extensibility in Moa avoids optimization obstacles due to black-box treatment of ADTs. The combination of a mapping of queries on complexly structured data to an efficient physical algebra expression via a nested relational algebra, extensibility open to optimization, and the consequently better integration of domain-specific algorithms, makes that the Moa system can efficiently handle complex queries from non-traditional application domains
Multi-agent coordination and control using stigmergy applied to manufacturing control
No full textstatus: Publishe
NMR spectra of magnetite with Zn substitution
No full textNazev prace: Spektra jaderne magneticke rezona.nce magnetitu se substHuci zinku Autor: Richard Rezm'cck Katedra. (ustav): Katedra fyziky m'zkych teplot Vedoucf bakaldfske prace: Doc1- RNDr. Helena Stepankova, CSc. e-mail vedouefho: Helena. StepankovavQhriff.cuni.cz Abstrakt: Naplm feto bakalafske prace bylo studium souboru monokrystalickych vzorku magnetitu s ruznymi koncentracemi substituce zinku pomoei metody ja- derne magrieticko rczonance. Ci'k'in bylo vyhodnoeeni vlivu substitnce na. spek- tra NMU jader r"Fe a na spin-mfi'zkove a spin-spinove relaxacm' doby mefene v nulovcm oxtenn'm magnet.iekeui [)oli pfi teplutach pod ('1,2 K) i nad (198 K a 273 K) Verwevovym prechodom. Bylo pozorovano rio/sifovanf sjiektrahu'ch car H rostoucf koncent.raci zinkn. Ve spek(rec:h znicfciiych pri teplota<:h nad Verweyovyin preehodem byla nale^ena struktura satelitin'eh signalu indnkovanyeh pfi'toinnosti zinku. Byly popyauy zmerene zavislo.sfi relaxariiich dob sp<^trahn'cli car na kon- eentraei Hiibstituee,. Klicova slova: NMR, magnetit. substitucc Zn, (dektronova struktura, magneticke oxidy Title: NMR speetra of magnetite; with Zn .substitution Author: Richard Reznicek Department: Department of Low Temperature Physics Supervisor: Doc. RNDr. Helena Stepankova, CSc. Supervisor's e-mail address: Helen a.Sto^nukova<(l..
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