Adaptive Multiagent System for Network Traffic Monitoring

An application of agent-based data mining for near-real time detection of attacks against the computer networks and connected hosts is based on processing network traffic statistics provided by high-speed network monitoring cards and using a set of known anomaly-detection techniques to identify the anomalous behavior. The individual anomaly-detection methods have relatively high error rates that make them unfit for most practical deployments. Using the agent-based trust modeling technique, the Camnep system fuses the data provided by anomaly-detection methods and progressively builds a better classification with an acceptable error rate. The system uses agent-based self-adaptation techniques to dynamically align its structure with the changes in network traffic structure and attacks.     

Minimum‐voltage driving of small STN‐LCDs by optimized multiple‐row addressing

Abstract— In small STN‐LCDs for portable applications, rows and columns are driven by one IC. The LC supply voltages are generated on‐chip from the battery voltage by voltage multiplying. The total LC supply voltage should be as low as possible to minimize the accompanied power losses. By using multiple‐row addressing, the row and maximum column voltages can be made equal, leading to a minimum LC supply voltage. This occurs when the number of simultaneously addressed rows is equal to the square root of the number of rows in the panel. The LC supply voltage may be minimized further by using a liquid crystal which allows multiplexing of more rows than are actually present in the display panel, while at the same time fewer simultaneously addressed rows are required.     

Swelling and photoelastic behaviour of ionized hydrogels of poly(acrylic acid)

Summary The photoelastic and swelling behaviour of poly(acrylic acid) gels swollen in 1 M NaCl aqueous solution was studied as a function of crosslinking degree (1–5 wt.% ethylene glycol dimethacrylate) and degree of ionization _g = 0 – 1. The degree of swelling passes through a minimum at _g – 0.15 regardless of the degree of crosslinking, probably due to the formation of hydrogen bonds between ionized and nonionized carboxyl groups. In the same neutralization region, the equilibrium modulus reaches a maximum; on the other hand, the modulus related to the dry state is independent of for all crosslinker concentrations. Thus the mechanical behaviour of poly(acrylic acid) gels is in accord with the Gaussian theory and no contribution of permanent physical interactions to the modulus is observed. The optical behaviour is more complex — the sign of the stress-optical coefficient C _e changes three times with increasing due to the orientation of the side groups. The analysis of the optical data shows that the C _e value is controlled by the degree of swelling and by the ionization.     

Optimal input design for model discrimination using Pontryagin’s maximum principle: Application to kinetic model structures

The paper presents a methodology for an optimal input design for model discrimination. To allow analytical solutions, the method, using Pontryagin’s maximum principle, is developed for non-linear single-state systems that are affine in their joint input. The method is demonstrated on a fed-batch reactor case study with first-order and Monod kinetics.     

Collisions of electrons with hydrogen atoms II. Low-energy program using the method of the exterior complex scaling

While collisions of electrons with hydrogen atoms pose a well studied and in some sense closed problem, there is still no free computer code ready for “production use”, that would enable applied researchers to generate necessary data for arbitrary impact energies and scattering transitions directly if absent in on-line scattering databases. This is the second article on the Hex program package, which describes a new computer code that is, with a little setup, capable of solving the scattering equations for energies ranging from a fraction of the ionization threshold to approximately 100 eV or more, depending on the available computational resources. The program implements the exterior complex scaling method in the B-spline basis.     

Quantitative structure-property relationships of new benzoxazines and their electrooxidation as a model of metabolic degradation

The quantitative structure-property relationships study of 40 benzoxazines, that seem to be very promising antimycobacterial drugs, allowed proposing and testing of the equations describing effects of substituents on half-wave potentials of these compounds. Although two structural types of benzoxazines were studied (i.e. thioxobenzoxazinones and benzoxazinedithiones), it is possible to describe the effect of substituent on half-wave potentials of benzoxazines by one general equation. A good correlation for relationship between half-wave potential and energy of HOMO orbital was also found.The study of electrochemical oxidation of these compounds as a model of their possible metabolic degradation was performed. It was possible to propose general scheme of electrochemical oxidation of sulfur containing benzoxazine derivatives. From the metabolic point of view, desulfuration is the corresponding process to this pathway. As these derivatives were not examined in vivo, obtained results represent very beneficial clues, and, moreover, proposed scheme could serve as a support for the explanation of strong antimycobacterial activity of sulfur containing benzoxazines.     

Dynamic behaviour of an adiabatic trickle bed reactor

Transient axial temperature profiles were measured in a laboratory adiabatic trickle bed reactor. Attention was paid to hot spot formation within the bed. The appearance of the hot spot temperature is a result of evaporation of the liquid reaction mixture. The motion of the hot spot temperature is caused by axial heat transfer resembles propagation of flame during combustion.     

Free radical reactions of peroxidizing lipids with amino acids and proteins: An ESR study

Free radical transfer from oxidizing methyl linoleate to amino acids and proteins was studied in dry model systems incubated for periods up to 20 days. Electron spin resonance was used to study free radical production. Free radicals were detectable in the amino acids lysine, arginine, histidine, tryptophan, and cysteine. Reduced glutathione and, to a limited extent, cystine also gave free radical signals. Free radicals produced in proteins primarily showed central singlet lines, attributable to carbon-centered radicals, with g=2.004±0.001. Sulfhydryl proteins also exhibited downfield shoulders at g≄2.015 and 2.023 that were essentially identical to peaks observed in cysteine and reduced glutathione. The field positions of sulfur resonance in cysteine and proteins suggested a sulfur-oxygen complex rather than thiyl radicals. This report is part of ScD Thesis, MIT, 1974 (KMS).     

Cyclotrimerization of isocyanate groups. I. Catalyzed reactions of phenyl isocyanate

Cyclotrimerization of phenyl isocyanate in the presence of various catalysts was studied. All reactions were carried out in 1,4-dioxane at 30–50°C. Reaction products were determined by reverse-phase liquid chromatography. 1,3,5-Triphenyl isocyanurate was formed and also traces of 1,3-diphenylurea and 1,3,5-triphenylbiuret were found. The catalytic activity decreased in the following series: quaternary ammonium salt > organic acid salt ? tertiary amine. Apparent rate constants of cyclotrimerization were calculated and the overall reaction order is discussed. © 1994 John Wiley & Sons, Inc.     

Die polymerisation der lactame XI. Die copolymerisation von 6-caprolactam mit 12-laurolactam

The course of the incorporation of 6-caprolactam and 12-laurolactam into polymer chains during the hydrolytic, cationic and anionic copolymerization for an equimolar ratio of the monomers was studied. During the hydrolytic copolymerization 6-caprolactam is incorporated more rapidly at 260, 230 or 200°C at the beginning of the polymerization process; the differences between incorporation rates of the lactams into the copolymer increase with decreasing temperature. During the cationic copolymerization the incorporation of 12-laurolactam is more rapid by orders of magnitude for the above temperatures at the beginning of the process. Changes in the composition of cationic copolymers as compared to the hydrolytic copolymers are independent of the temperature during the copolymerization. The anionic copolymerization is characterized by a more rapid incorporation of 6-caprolactam into the polymer chain. The differences in the polymerization activity of the two lactams decrease with increasing temperature of the anionic copolymerization. The described course of incorporation of individual monomers, with the various mechanisms of the polymerization, also corresponds to melting points of copolymers in accordance with their composition.