Search

This paper summarizes our efforts in implementing a working multi-level secure database prototype. We have chosen Belief-Consistent Multilevel Secure Relational Data Model (BCMLS) as a basis for our prototype because of its comprehensive semantics for interpreting all stored information. While semantically superior to other models, this model has not been implemented as a working system before. Our prototype, which was created on an Informix database server with a PHP web client, enables insertion, deletion and update of multi-level data while addressing the underlying model complexities through a number of original solutions.

The paper presents a grammatical approach to problem solving. It supports for-mal software, specification using attribute grammars, from, which, a rapid prototype can be generated as well the incremental, software development. Domain concepts and relationships among them. have to be identified from a problem statement and represented as a context-free grammar. The obtained context-free grammar describes the syntax of a dowain-specific language whose semantics is the same as the functionality of the system under implementation. The semantics of this language is then described using attribute grammars from which a compiler is automatically generated. The execution of a particular programme written in a domain-specific language corresponds to the execution of a prototype of a system on a particular use-case. GRICES -MCTES

In this paper we are identifying problems in the complex Web application implementations. In more details we are addressing problem of content management and specific components of such system. We are also presenting our implementation of Web Content Management System (WCMS), which is based on relational database and XML technologies. It also uses some rather new concepts and technologies like XForms and Native XML database.

Data warehouse systems have become a basic technological infrastructure in management decision making. Nevertheless, the overall utility of data warehouses remains unmeasured in most practical cases. As a consequence of this, IT-managers do not possess appropriate means to evaluate warehouse benefits in order to decide about investments in warehousing technology. This paper develops a controlling instrument for data warehouse systems based on the Balanced Scorecard (BSC) approach. On the basis of the technological aspects of data warehouse systems, the BSC perspectives are developed and populated with relevant objectives and measures for datawarehouse success. These perspectives are integrated into a consistent data warehouse scorecard. Finally, this instrument provides a holistic approach to drive the performance of data warehouse systems.

The paper presents a mathematical model addressing the problem of cargo transport by container ship on the selected route, where, certain number of containers of various masses and types are chosen out of total number of containers available in loading port in order to achieve maximum transport profitability, provided maximum payload and transport capacity of container ship. Since the profitability is an index of operation efficiency expressed as a fraction, respective mathematical model can be solved using linear fractional programming. The model was tested on real-life example of feeder ship "Lipa" owned by "Lošinjska plovidba", Rijeka, operating on route Rijeka-Gioia Tauro.