Even though companies maintain highly-structured, traditional business data in relational databases, large amounts of information are available in semi-structured text sources, such as indexed online newspapers , patent information, literature citations or business prooles. This information is ooered by commercial providers who maintain complete control over access language, schemas and update ...

The plethora of existing data models and specific data modeling techniques is not only confusing but leads to complex, eclectic and inefficient designs of systems for data management and analytics. The main goal of this paper is to describe a unified approach to data modeling, called the concept-oriented model (COM), by using functions as a basis for its formalization. COM tries to answer the q...

Current wireless systems offer various use-cases where conventional channel capacity focused performance criteria might not apply. Following the similar perspective, convolutional encoding can find more room due to its low complexity and decoding delay. Besides, it has been also shown that error of a encoder be improved further by using adaptive irregular constellations. A new measure, data-ori...

Several views on man-machine interaction are possible to measure usability attributes: (1) the interaction-oriented view, (2) the user-oriented view, (3) the product-oriented view and (4) the formal view. Two different possibilities of measurement within the product-oriented view are introduced in this paper. Different types of user interfaces can be described and differentiated by the concept ...

View-Oriented Parallel Programming (VOPP) is a novel parallel programming model which uses views for communication between multiple processes. With the introduction of views, mutual exclusion and shared data access are bundled together, which offers both convenience and high performance to parallel programming. This paper presents the performance results of VOPP on Chip-Multithreading processor...

We present a concept to introduce external models in object-oriented databases to regain the traditional three level architecture of database systems consisting of an internal, a conceptual and several external models. In contrast to other approaches our concept takes into account all traditional features of external models such as submodeling, interfacing application programs and databases, lo...