Discriminative power of the receptors activated by k-contiguous bits rule

The paper provides a brief introduction into a relatively new discipline: artificial immune systems (AIS). These are computer systems exploiting the natural immune system (or NIS for brevity) metaphor: protect an organism against invaders. Hence, a natural field of applications of AIS is computer security. But the notion of invader can be extended further: for instance a fault occurring in a system disturbs patterns of its regular functioning. Thus fault, or anomaly detection is another field of applications. It is convenient to represent the information about normal and abnormal functioning of a system in binary form (e.g. computer programs/viruses are binary files). Now the problem can be stated as follows: given a set of self patterns representing normal behaviour of a system under considerations find a set of detectors (i.e, antibodies, or more precisely, receptors) identifying all non self strings corresponding to abnormal states of the system. A new algorithm for generating antibody strings is presented. Its interesting property is that it allows to find in advance the number of of strings which cannot be detected by an "ideal" receptors repertoire.Facultad de Informátic

Discriminative power of the receptors activated by k-contiguous bits rule

The paper provides a brief introduction into a relatively new discipline: artificial immune systems (AIS). These are computer systems exploiting the natural immune system (or NIS for brevity) metaphor: protect an organism against invaders. Hence, a natural field of applications of AIS is computer security. But the notion of invader can be extended further: for instance a fault occurring in a system disturbs patterns of its regular functioning. Thus fault, or anomaly detection is another field of applications. It is convenient to represent the information about normal and abnormal functioning of a system in binary form (e.g. computer programs/viruses are binary files). Now the problem can be stated as follows: given a set of self patterns representing normal behaviour of a system under considerations find a set of detectors (i.e, antibodies, or more precisely, receptors) identifying all non self strings corresponding to abnormal states of the system. A new algorithm for generating antibody strings is presented. Its interesting property is that it allows to find in advance the number of of strings which cannot be detected by an "ideal" receptors repertoire.Facultad de Informátic

Personalization for the Semantic Web III

This report provides an overview of the achievements of working group A3 for bringing personalization functionality to the Semantic Web. It continues the work started in the deliverable A3-D1 and A3-D4. In the deliverable at hand, we report on a successfully held workshop on Semantic Web Personalization at the 3rd European Semantic Web Conference, and the research results on techniques and algorithms for enabling personalization in the Semantic Web, and achievements on developing suitable architectures for the personalized information systems in the Semantic Web.peer-reviewe

Properties of Surface Layers Produced from a Metalorganic Titanium Compound Under Glow Discharge Conditions

A prospective line in the development of thermo-chemical treatments under glow discharge conditions is to work out new techniques of producing multicomponent layers, e.g., composite layers, by combining various treatments, such as e.g. plasma nitriding and the PACVD method. The combined properties, appropriately selected and complementary to one another, of the single-component layers obtained using one of these processes, permit widening the application range of the layers. The paper specifies the conditions under which the multicomponent layers of Ti(OCN) type and composite layers of the nitrided + TiN or nitrided + Ti(OCN) type can be produced on steel. The structure and properties of the layers thus obtained are also described

Formation of Ti(OCN) Layers Under Glow Discharge Conditions

By using a gaseous mixture composed of tetraisopropoxytitanium, nitrogen and hydrogen in PACVD process, we obtain Ti(OCN) layers of a good performrance properties, such as a high hardness and good resistance to corrosion and to frictional wear. The optimum temperature of the process is 500°C. At higher temperatures, the surface microhardness decreases. When the process is carried out at 700°C, a surface layer which contain titanium cannot be obtained, only a diffusive oxycarbonitrided layer forms. Spectral investigations by optical emission spectroscopy have shown that the active particles that take part in the formation of the Ti(OCN) type layer are titanium ion Ti, nitrogen particles : N, N2, NH, oxygen atoms and CN radicals coming from the gaseous atmosphere and also nitrogen from the pre-nitrided substrate