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544 articles for “Database”
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Research ArticleOpen accessEvery word in the titleAdaptive Update Policy for Proactive Management of Deadline Miss Ratio and Data Freshness in Real-Time Database ModelsSanjay Tanwani, Ashwani K. RamaniImportant applications, like e-commerce, online stock trading, traffic control demand real-time data services. Conventional database perform poor at these applications. A database for real-time data services has to support timing constraints and temporal consistency in addition to supporting characteristics of a conventional database system. In other words, it is desirable to execute transactions within its deadline using updated data reflecting … …Journal of Computer Science, Vol. 1, Issue 4 · 31 Dec 2005 · 6,207 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleAutomatic Discovery of Association Paths in Relational Databases Using Software VisualizationHaider Ali RamadhanWe introduce a visual framework for facilitating tasks associated with database maintenance and re-use. The prototype system embodying the framework is presented. The system utilizes various techniques and features of software visualization. The system supports visual displays of the database structure along with various implicit relationships found in it such as associations and path views. Information visualized is automatically extracted … …Journal of Computer Science, Vol. 1, Issue 3 · 30 Sep 2005 · 6,643 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleA Secure Database Encryption SchemeZongkai Yang, Samba Sesay, Jingwen Chen, Du XuThe need to protect database, would be an every growing one especially so in this age of e-commerce. Many conventional database security systems are bugged with holes that can be used by attackers to penetrate the database. No matter what degree of security is put in place, sensitive data in database are still vulnerable to attack. To avoid the risk … …American Journal of Applied Sciences, Vol. 1, Issue 4 · 31 Dec 2004 · 7,348 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleSWITCHING-ALGEBRAIC ANALYSIS OF RELATIONAL DATABASESAli Muhammad Ali Rushdi, Omar Mohammed Ba-RukabThere is an established equivalence between relational database Functional Dependencies (FDs) and a fragment of switching algebra that is built typically of Horn clauses. This equivalence pertains to both concepts and procedures of the FD relational database domain and the switching algebraic domain. This study is an exposition of the use of switching-algebraic tools in solving problems typically encountered in … …Journal of Mathematics and Statistics, Vol. 10, Issue 2 · 18 Apr 2014 · 6,705 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleA Dynamic Object Fragmentation and Replication Algorithm In Distributed Database SystemsAzzam Sleit, Wesam AlMobaideen, Samih Al-Areqi, Abdulaziz YahyaThis paper proposes an enhancement for the ADRW algorithm to achieve dynamic fragmentation and object allocation in distributed databases. The algorithm adapts to the changing patterns of object requests with the objective to dynamically adjust the allocation schemes of objects in order to minimize the total servicing cost of all requests. Objects may be replicated or fragmented depending on patterns … …American Journal of Applied Sciences, Vol. 4, Issue 8 · 31 Aug 2007 · 7,384 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleA New Semantic Cache Management Method in Mobile DatabasesShengfei Shi, Jianzhong Li, Chaokun WangIn mobile database systems, caching is a crucial way to improve the performance because a new query can be partially answered locally when the client is continuously moving around. Semantic caching has been paid much attention in traditional database systems. However, the methods of semantic cache management proposed in those systems are not suitable for mobile computing environment. Moreover, although … …Journal of Computer Science, Vol. 1, Issue 3 · 30 Sep 2005 · 6,878 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleAdaptivity in Role-Based Access Control During Stochastic Situations: A Comprehensive Study between Graph and Relational DatabasesKriti Srivastava, Dhruv Jain, Aarya Kamdar et al.Role-based control is straightforward to implement in static systems where there are specific policies for role and resource mapping. The main challenge is faced in dynamic and unpredictable systems with erratic workflows. Conventional methods prove to be inadequate in dynamic environments. Over the Years methods suggested include probabilistic, machine learning, ontology, and decision tree models to improve the adaptability. However, … …Journal of Computer Science, Vol. 20, Issue 12 · 18 Nov 2024 · 5,372 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleExtending the Concepts of Normalization from Relational Databases to Extensible-Markup-Language Databases ModelH.J. F. El-SofanyIn this study we have studied the problem of how to extend the concepts of Functional Dependency (FD) and normalization in relational databases to include the eXtensible Markup Language (XML) model. We shown that, like relational databases, XML documents may contain redundant information and this redundancy may cause update anomalies. Furthermore, such problems are caused by certain functional dependencies among … …Journal of Computer Science, Vol. 4, Issue 9 · 30 Sep 2008 · 6,461 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleAn Efficient Algorithm for Tree Mapping in XML DatabasesYangjun ChenIn this article, we discuss an efficient algorithm for tree mapping problem in XML databases. Given a target tree T and a pattern tree Q, the algorithm can find all the embeddings of Q in T in O(|T||Q|) time while the existing approaches need exponential time in the worst case. …Journal of Computer Science, Vol. 3, Issue 7 · 21 Jul 2007 · 6,567 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleModeling of Fundamental Frequency Contours for Thai Dialects with Large Speech DatabaseSuphattharachai ChomphanIn four core regions of Thailand, there are four main dialects including central, north, northeast and south dialects. The prosody is significantly unique for each dialect. One important factor determining the prosody is the fundamental frequency. As a result, modeling of Fundamental frequency (F0) contour is very important for the natural speech processing. Even though there are many modeling techniques … …American Journal of Applied Sciences, Vol. 9, Issue 12 · 20 Dec 2012 · 7,341 accessesView PDFCite