Eric Pardede

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The use of cloud computing has increased rapidly in many organizations. Cloud computing provides many benefits in terms of low cost and accessibility of data. Ensuring the security of cloud computing is a major factor in the cloud computing environment, as users often store sensitive information with cloud storage providers but these providers may be(More)
Security is considered to be one of the most critical aspects in a cloud computing environment due to the sensitive and important information stored in the cloud for users. Users are wondering about attacks on the integrity and the availability of their data in the cloud from malicious insiders and outsiders, and from any collateral damage of cloud(More)
XML data can be stored in different databases including Object-Relational Database (ORDB). Using ORDB, we get the benefit of the relational maturity and the richness of OO modeling. One modeling concept that can be captured is the collection. Collection structures frequently occur in XML documents especially in two relationship types: aggregation and(More)
XML data can be stored in various database repositories, including Object-Relational Database (ORDB). Using an ORDB, we get the benefit of the relational maturity and the richness of Object-Oriented modeling, including various complex data types. These data types resemble the true nature of XML data and therefore, the conceptual semantic of XML data can be(More)
Security is considered to be one of the most critical aspects in a cloud computing environment due to the sensitivity and importance of information stored in the cloud and also because the management of the data might not be fully trustworthy. The risk of malicious insiders in the cloud and the failing of cloud services have received a strong attention by(More)
An ever increasing amount of medical data such as electronic health records, is being collected, stored, shared and managed in large online health information systems and electronic medical record systems (EMR) (Williams et al., 2001; Virtanen, 2009; Huang and Liou, 2007) [1-3]. From such rich collections, data is often published in the form of census and(More)
XML (eXtensible Markup Language) is fast emerging as the dominant standard for describing data and interchanging data between various systems and databases on the Internet. It offers the XML Schema definition language as formalism for defining the syntax and structure of XML documents provide rich facilities for defining and constraining the content of XML(More)
In this paper we examine the impact of the newest generation of Structured Q u e y Language (SQL), which is the standard language for Relational Model. The new standard of SQL4 ad& powerJui object-oriented data structures to Object-Relational Database (ORDB). which is designed and implemented on Relational Model, to be used in diverse applications. This(More)
Association and aggregation are two relationship types in the object-oriented conceptual model (OOCM) that frequently involve collection of elements/attributes. However, very often when the relationships are stored in object relational database (ORDB) the collection is flattened like it is implemented by pure relational model. In this paper we propose the(More)