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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Duomenų, surinktų iš HTML failų, publikavimo RDF formate metodika / Data collected from the HTML files, RDF publishing techniques

Mureika, Evaldas 13 August 2012 (has links)
Semantinis tinklas – tai duomenų tinklas, leidžiantis apjungti informaciją esančią įvairiuose šaltiniuose ir pavaizduoti visą surinktą informaciją kaip vientisą turinį. Semantiniame tinkle duomenys susieti ir prieinami per bendrąją tinko architektūrą, panaudojant URI adresus. Didžioji dalis duomenų yra neapjungti ir prienami atskiroms taikomosioms programoms. Apjungus šiuos įvairiuose šaltiniuose laikomus duomenis būtų sukurtas semantinis duomenų tinklas. Duomenims panaudoti, aprašyti bei susieti kuriami įvairūs karkasai, leidžiantys pakartotinai dalintis duomenimis visose taikymo srityse, įmonėse bei bendrijose. Struktūrizuota semantinė informacija naudojama automatiškai arba rankiniu būdu ir apdorojama kompiuterių. Semantinio tinklo metodai ir technologijos leidžia kompiuteriams suprasti pasauliniame tinkle (angl.World Wide Web) laikomos informacijos reikšmę arba kitaip semantiką. Semantinio tinklo technologijos panaudojamos: 1) duomenų integracijai, duomenų laikomų skirtingose vietose ir saugomų skirtingais formatais susiejimui; 2) resursų aptikimui ir klasifikacijai, sukuriant geresnį informacijos paieškos variklį; 3) tinklapių, svetainių ar skaitmeninių bibliotekų katalogavimui aprašant turinį, turinio ryšius; 4) sumaniųjų programinės įrangos agentų žinių mainams palengvinti; 5) turinio reitingavimui; 6) aprašant intelektualinės nuosavybės teises (tinklapiuose); Semantiniotinklų taikymas bei technologijos technologijos yra dar labai naujos, neištirtos, neišbandytos... [toliau žr. visą tekstą] / Semantic Network - is a data network of the information to combined from various sources and displayed as onesolid content. Data, in the Semantic networks is accessed using URIs, via a common network architecture. Semantic networks and technologies are still very new, unexplored, not tested inpractice and lacking of reference material. It isnecesery to analyzehow the technology is advanced and what technology and tools are used for semantic web application development. Objectives of this work: 1) To analyze how HTML data can be published; 2) To analyze the development of semantic web technologies; 3) To create an application automatically scanning the data from the HTML files; 4) To create an application that generates the OWL ontology of the relational database; 5) Apply semantic publishing for data; 6) To analize experimentaly HTML data colleting application and OWL generator.
2

Validierung von Software-Komponenten zur Voraussage der strahleninduzierten Schädigung von RDB-Stahl

Bergner, F., Ulbricht, A. 22 September 2010 (has links) (PDF)
Die skalenübergreifende Modellierung der strahleninduzierten Schädigung von RDB-Stahl von den Primärschäden auf der atomaren Skala bis zu den Änderungen der mechanischen Eigenschaften auf der Makroskala trägt wesentlich zu einem ver¬besserten Verständnis des Phänomens der Neutronenversprödung bei. Sie kann sich zukünftig zu einem Bestandteil der Sicherheitsbewertung des RDB entwickeln. Der gewählte zweistufige Modellierungsansatz beruht auf der Kopplung eines ratentheoretischen Moduls zur Voraussage der Größenverteilung der strahlen¬induzierten Defekt-Fremdatom-Cluster mit einem Härtungs-Modul zur Voraussage der strahleninduzierten Streckgrenzenerhöhung. Gegenstand der Untersuchungen sind die Weiterentwicklung und Validierung entsprechender Software-Komponenten. Die Validierung erfolgt durch Gegenüberstellung der Berechnungsergebnisse mit Resultaten von Neutronenkleinwinkelstreumessungen und Zugversuchen an neutronenbestrahlten RDB-Stählen. Der entwickelte ratentheoretische Modul ermöglicht es, die Größe, Konzentration und Zusammensetzung gemischter Cu-Leerstellen-Cluster über die für RDB-Stähle relevanten Größenbereiche von bis zu 10000 Atomen und Zeitbereiche von bis zu mehreren 10 Jahren zu verfolgen. Die Verbindung der Ratentheorie zur Härtungs¬modellierung beruht auf der Übergabe von berechneten mittleren Hindernis¬abständen und -stärken. Die Validierung der numerischen Werkzeuge hat ergeben, dass wesentliche Tendenzen der strahleninduzierten Streckgrenzenerhöhung von Cu-haltigen und Cu-armen RDB-Stählen richtig wiedergegeben werden. Erste Ansätze zur Erfassung des Einflusses des Legierungselements Nickel im Rahmen der Ratentheorie und der Härtungsmodellierung wurden verwirklicht.
3

Database comparison, Oracle vs RDB

Bah, Oury Amadou January 1992 (has links)
Database and database technology are having a major impact on the growing use of computers. The rising popularity of database systems for the management of data has resulted in an increasing number of systems. As the number grows, the difficulty in choosing the system which will best meet the requirements of a particular application also increases. Knowing how to choose the correct one for a given application is important.The purpose of this thesis is to compare two very commonly used Database Management Systems (ORACLE and RDB) at Ball State University by describing and listing the advantages of each of them as well as their weaknesses, giving a comprehensive study of their performances, user friendliness, limits, and to aid users and managers in obtaining a deeper knowledge of these two systems. / Department of Computer Science
4

Database comparison : Oracle vs RDB

Alhaffar, Mohammed January 1992 (has links)
Databases and database technology are having a major impact on the growing use of computers. It is fair to say that databases are playing a critical role in almost all areas where computers are used, including business, engineering, medicine, law, education, and library science, to name a few.At Ball State University, databases are very widely used among faculty, staff, and students. The common commercial database management system (DBMS) used in the university is ORACLE. Due to the extensive use of the system and the availability and easy access to alternative systems such as RDB/VMS, a comparative research is in order.This thesis is a comprehensive comparison between the two systems. It covers the differences in design, SQL codings, and the use of host programming language such as FORTRAN. It concentrates on the differences in memory usage, execution time, as well as the CPU time needed to precompile, link, and run. / Department of Computer Science
5

Objektinių ir reliacinių duomenų bazių taikymas objektiškai orientuoto programavimo kontekste / Application of object and relational databases in context of object oriented programming

Raginia, Piotr 08 September 2009 (has links)
Šiame magistro baigiamajame darbe lyginamos objektinių ir reliacinių duomenų bazių taikymo galimybės objektiškai orientuoto programavimo kontekste. Duomenų bazių ir objektiškai orientuoto programavimo naudojimas iškelia dvi pagrindines problemas. Pirma problema yra reliacinių duomenų bazių ir objektiškai orientuotų programavimo kalbų nesuderinamumas. Antra – duomenų bazių naudojimas judriųjų programų sistemų kūrimo metodikų aplinkoje. Norint palyginti reliacinių ir objektinių duomenų bazių taikymo galimybes buvo nuspręsta sudaryti metodų ir įrankių, skirtų iškeltoms problemoms spręsti, vertinimo modelį. Kadangi iškeltos problemos buvo per stambios vertinimo modelio sudarymui, jos buvo detalizuotos. Vertinami įrankiai ir metodai buvo suskirstyti į keturias kategorijas pagal prigimtį. Iš kiekvienos grupės buvo vertinamas vienas įrankis ar metodas. Darbo pabaigoje visi gauti rezultatai agreguoti ir pateiktos objektinių ir reliacinių duomenų bazių taikymo rekomendacijos, išskirti privalumai ir trūkumai. Beveik pagal visus vertinimo kriterijus objektinės duomenų bazės įvertintos maksimaliais balais. Tačiau iš vertinimo rezultatų paaiškėjo, kad ir jos turi tam tikrų taikymo apribojimų - tokių kaip lėtas duomenų išrinkimas esant dideliam transakcijų skaičiui. Automatinio atvaizdavimo įrankiai prastai tinka projektams, naudojantiems judriąsias programų sistemų kūrimo metodikas, ir sunkiai pritaikomi sudėtingoms hierarchinėms struktūroms atvaizduoti. Reliacinių koncepcijų integravimas... [toliau žr. visą tekstą] / This MA paper aims at object and relational databases application comparison in the context of object oriented programming. Joint usage of databases and object oriented programming raises two problems relevant today. First problem is impedance mismatch of relational databases and object oriented programming languages. Second – database usage in agile software development process environment. In order to define application area of object and relational databases it was decided to compose assessment model to compare solutions available today. Since chosen problems were too bulky they were detailed. The evaluated methods and tools were categorized into four groups by their nature. One tool or method from each group was evaluated. In the end of this MA paper all results were aggregated into object and relational databases usage guidelines and databases usage pros and cons. Object databases got the best evaluations in almost all defined criteria. However, evaluation also showed that object databases have some restrictions in application, such as bad performance when using multiple transactions. Object-relational mappers are not suitable for storing complex hierarchical class structures and usage with agile software development processes. Relational concepts integration into intermediate objects can be used only for very simple object schemes. Linq, evaluated in relational concepts integration with object oriented programming languages category, is still in development, but in... [to full text]
6

Validierung von Software-Komponenten zur Voraussage der strahleninduzierten Schädigung von RDB-Stahl

Bergner, F., Ulbricht, A. January 2010 (has links)
Die skalenübergreifende Modellierung der strahleninduzierten Schädigung von RDB-Stahl von den Primärschäden auf der atomaren Skala bis zu den Änderungen der mechanischen Eigenschaften auf der Makroskala trägt wesentlich zu einem ver¬besserten Verständnis des Phänomens der Neutronenversprödung bei. Sie kann sich zukünftig zu einem Bestandteil der Sicherheitsbewertung des RDB entwickeln. Der gewählte zweistufige Modellierungsansatz beruht auf der Kopplung eines ratentheoretischen Moduls zur Voraussage der Größenverteilung der strahlen¬induzierten Defekt-Fremdatom-Cluster mit einem Härtungs-Modul zur Voraussage der strahleninduzierten Streckgrenzenerhöhung. Gegenstand der Untersuchungen sind die Weiterentwicklung und Validierung entsprechender Software-Komponenten. Die Validierung erfolgt durch Gegenüberstellung der Berechnungsergebnisse mit Resultaten von Neutronenkleinwinkelstreumessungen und Zugversuchen an neutronenbestrahlten RDB-Stählen. Der entwickelte ratentheoretische Modul ermöglicht es, die Größe, Konzentration und Zusammensetzung gemischter Cu-Leerstellen-Cluster über die für RDB-Stähle relevanten Größenbereiche von bis zu 10000 Atomen und Zeitbereiche von bis zu mehreren 10 Jahren zu verfolgen. Die Verbindung der Ratentheorie zur Härtungs¬modellierung beruht auf der Übergabe von berechneten mittleren Hindernis¬abständen und -stärken. Die Validierung der numerischen Werkzeuge hat ergeben, dass wesentliche Tendenzen der strahleninduzierten Streckgrenzenerhöhung von Cu-haltigen und Cu-armen RDB-Stählen richtig wiedergegeben werden. Erste Ansätze zur Erfassung des Einflusses des Legierungselements Nickel im Rahmen der Ratentheorie und der Härtungsmodellierung wurden verwirklicht.
7

[en] W-RAY: AN APPROACH TO THE DEEP WEB DATA PUBLICATION / [pt] W-RAY: UMA ABORDAGEM PARA PUBLICAÇÃO DE DADOS DA DEEP WEB

HELENA SERRAO PICCININI 29 September 2014 (has links)
[pt] Deep Web é composta por dados armazenados em bases de dados, páginas dinâmicas, páginas com scripts e dados multimídia, dentre outros tipos de objetos. Os bancos de dados da Deep Web são geralmente sub-representados pelos motores de busca, devido aos desafios técnicos de localizar, acessar e indexar seus dados. A utilização de hyperlinks pelos motores de busca não é suficente para alcançar todos os dados da Deep Web, exigindo interação com interfaces de consultas complexas. Esta tese apresenta uma abordagem, denominada W-Ray, capaz de fornecer visibilidade aos dados da Deep Web. A abordagem baseia-se na descrição dos dados relevantes através de sentenças bem estruturadas, e na publicação dessas sentenças em páginas estáticas da Web. As sentenças podem ser geradas com RDFa embutido, mantendo a semântica do banco de dados. As páginas da Web assim geradas são passíveis de ser indexadas pelos motores de coleta de dados tradicionais e por motores mais sofisticados que suportam busca semântica. É apresentada também uma ferramenta que apóia a abordagem W-Ray. A abordagem foi implementada com sucesso para diferentes bancos de dados reais. / [en] The Deep Web comprises data stored in databases, dynamic pages, scripted pages and multimedia data, among other types of objects. The databases of the Deep Web are generally underrepresented by the search engines due to the technical challenges of locating, accessing and indexing them. The use of hyperlinks by search engines is not sufficient to achieve all the Deep Web data, requiring interaction with complex queries interfaces. This thesis presents an approach, called W-Ray, that provides visibility to Deep Web data. The approach relies on describing the relevant data through well-structured sentences, and on publishing the sentences as static Web pages. The sentences can be generated with embedded RDFa, keeping the semantics of the database. The Web pages thus generated are indexed by traditional Web crawlers and sophisticated crawlers that support semantic search. It is also presented a tool that supports the W-Ray approach. The approach has been successfully implemented for some real databases.
8

[en] DESIGN RATIONALE IN THE TRIPLIFICATION OF RELATIONAL DATABASES / [pt] DESIGN RATIONALE NA TRIPLIFICAÇÃO DE BANCOS DE DADOS RELACIONAIS

RITA CRISTINA GALARRAGA BERARDI 02 August 2016 (has links)
[pt] Uma das estratégias mais populares para publicar dados estruturados na Web é expor bases de dados relacionais (BDR) em formato RDF. Esse processo é chamado BDR-para-RDF ou triplificação. Além disto, princípios de Linked Data oferecem vários guias para dar suporte a este processo. Existem duas principais abordagens para mapear bases de dados relacionais para RDF: (1) a abordagem de mapeamento direto, onde o esquema das bases de dados é diretamente mapeado para um esquema RDF, e (2) a abordagem de mapeamento customizado, onde o esquema RDF pode ser significativamente diferente do esquema original da base de dados relacional. Em ambas abordagens, existem vários desafios relacionados tanto com a publicação quanto com o uso de dados em RDF originados de bases de dados relacionais. Esta tese propõe a coleta de design rationale como uma valiosa fonte de informação para minimizar os desafios do processo de triplificação. Essencialmente, a coleta de design rationale melhora a consciência sobre as ações feitas no mapeamento da base de dados relacional para um conjunto de dados no formato RDF. As principais contribuições da tese são: (1) um modelo de design rationale (DR) adequado para o processo de BDR-para- RDF, independente da abordagem utilizada (direta ou customizada); (2) a integração de um modelo de DR para um processo que segue a abordagem direta de BDR-para-RDF e para um processo que segue a abordagem customizada usando a linguagem R2RML; (3) o uso do DR coletado para melhorar recomendações de reuso de vocabulários existentes através de algoritmos de Ontology Matching. / [en] One of the most popular strategies to publish structured data on the Web is to expose relational databases (RDB) in the RDF format. This process is called in RDB-to-RDF or triplification. Furthermore, the Linked Data principles offer useful guidelines for this process. Broadly stated, there are two main approaches to map relational databases into RDF: (1) the direct mapping approach, where the database schema is directly mapped to an RDF schema; and (2) the customized mapping approach, where the RDF schema may significantly differ from the original database schema. In both approaches, there are challenges related to the publication and to the consumption of the published data. This thesis proposes the capture of design rationale as a valuable source of information to minimize the challenges in RDB-to-RDF processes. Essentially, the capture of design rationale increases the awareness about the actions taken over the relational database to map it as an RDF dataset. The main contributions of this thesis are: (1) a design rationale (DR) model adequate to RDB-to-RDF processes, independently of the approach (direct or customized) followed; (2) the integration of a DR model in an RDB-to-RDF direct mapping process and in an RDB-to-RDF customized mapping process using the R2RML language; (3) the use of the DR captured to improve the recommendations for vocabularies to reuse.

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