Budapest Bridges Benchmarking

This paper is concerned with the comparison of different scaling methods which are applied to a complex bridge evaluation problem. It is shown that both tangible and intangible data and satisfaction of multiple criteria are essential to the success of such projects. Some new inconsistency measures for the matrices emerging in the decision making process are also used. A detailed numerical analysis of the results is presented.

Comparison of Employers’ and Student’s Ratings of Importance of Expected Technical Skills

Based on literature review and surveys conducted by the Faculty of Economics of Budapest Tech the importance ratings of the technical skills of American and Hungarian business students expected on entering employment are developed. The importance ratings of these technical skills are assessed by American and Hungarian employers also. The study compares the magnitudes of the importance of the single attributes and their priority rankings. Based on a comprehensive statistical analysis the major findings are also given.

The Use of the AHP in Civil Engineering Projects

Most engineering, economic, social and institutional decisions are made with explicit notions of optimal behavior and implicit human motivations. In such a process, manipulation of both tangible and intangible data and satisfaction of multiple criteria are essential to the success of decision-making. In this paper an approach to multiple-criteria decision making known as the analytic hierarchy process (AHP) is presented. Some mathematical details of the procedure are briefly discussed. The application of the method to a real life civil engineering project for the selection of an appropriate bridge design is also presented.multi-criteria decision making, analytic hierarchy process, bridge design

Operator splitting for nonautonomous delay equations

We provide a general product formula for the solution of nonautonomous abstract delay equations. After having shown the convergence we obtain estimates on the order of convergence for differentiable history functions. Finally, the theoretical results are demonstrated on some typical numerical examples.Comment: to appear in "Computers & Mathematics with Applications (CAMWA)

Operator splitting for dissipative delay equations

We investigate Lie-Trotter product formulae for abstract nonlinear evolution equations with delay. Using results from the theory of nonlinear contraction semigroups in Hilbert spaces, we explain the convergence of the splitting procedure. The order of convergence is also investigated in detail, and some numerical illustrations are presented.Comment: to appear in Semigroup Foru

Az antiaritmiás gyógyszerek proaritmiás hatását befolyásoló tényezők vizsgálata = Examination of the factors that influence the proarrhythmic effects of the antiarrhythmic drugs

Vizsgálataink során megállapítottuk, hogy az altatószerek módosítják a gyógyszerek proaritmiás hatását nyulakban. Mivel a vagotomia védő hatású volt, a vegetatív idegrendszer valószínűleg befolyásolja a gyógyszerek proaritmiás hatásait nyúlban, de ennek részletei további tisztázásra várnak. Az EKG-n mérhető repolarizációs paraméterek nem jelzik előre a dofetilid okozta torsades de pointes kialakulását nyúlban. Állandó kamrafeszülés, tartós magasvérnyomás és intracardiális alfa1 adrenoceptor izgalom nem fokozza a dofetilid proaritmiás hatását nyúlban. A Na+/Ca2+ exchanger (NCX) szelektív gátlása nem csökkenti a dofetilid proaritmiás hatását izolált nyúl szívben. Az NCX gátlás patkányban pozitív inotróp hatású, míg nyúlban nem befolyásolja a kontraktilitást. E fajspecifikus különbség hátterében nem az NCX gátló (SEA0400) eltérő farmakodinámiai hatása vagy az NCX eltérő expressziója áll. | Our results show that intravenous anaesthetics may modify the proarrhythmic effects of drugs in rabbits. Since vagotomy prevented torsades de pointes, autonomic nervous system (ANS) may affect the proarrhithmic reactions in rabbits, however, further examinations are needed to clarify the effect of ANS on proarrhythmia. The repolarization related parameters of the ECG did not predict dofetilide-induced torsades de pointes in rabbits. Standard ventricular stretch, high blood pressure and intracardiac alpha1-adrenoceptor stimulation did not promote the proarrhythmic activity of dofetilide. The selective inhibition of the Na+/Ca2+ exchanger (NCX) with SEA0400 did not reduce the incidence of dofetilide-induced torsades de pointes in isolated perfused rabbit hearts. The inhibition of the NCX elevated inotropy in isolated rat hearts, but failed to affect contractility in isolated rabbit hearts. This interspecies difference was not related to the pharmacodynamic properties of the SEA0400 or the NCX expression

Measurement of Railway Track Geometry: A State-of-the-Art Review

The worldwide increase in frequency of traffic for passenger trains and the rise of freight trains over the recent years necessitate the more intense deployment of track monitoring and rail inspection procedures. The wheel-rail contact forces, induced by the static axle loads of the vehicle and the dynamic effects of ground-borne vibration coming from the track superstructure, have been a significant factor contributing to the degradation of the railway track system. Measurements of track irregularities have been applied since the early days of railway engineering to reveal the current condition and quality of railway lines. Track geometry is a term used to collectively refer to the measurable parameters including the faults of railway tracks and rails. This paper is aiming to review the characteristics of compact inertial measurement systems (IMUs), their components, installation, the basic measures of the quality of the track using motion sensors, like accelerometers, gyroscopes and other sensing devices mounted on different places of the vehicle. Additionally, the paper briefly discusses the fundamentals of inertial navigation, the kinematics of the translational and rotational train motions to obtain orientation, velocity and position information

Operator splitting with spatial-temporal discretization

Continuing earlier investigations, we analyze the convergence of operator splitting procedures combined with spatial discretization and rational approximations