A Recursive Orthogonal Least Squares Algorithm for Training RBF Networks

A recursive orthogonal least squares (ROLS) algorithm for multi-input, multi-output systems is developed in this paper and is applied to updating the weighting matrix of a radial basis function network. An illustrative example is given, to demonstrate the effectiveness of the algorithm for eliminating the effects of ill-conditioning in the training data, in an application of neural modelling of a multi-variable chemical process. Comparisons with results from using standard least squares algorithms, in batch and recursive form, show that the ROLS algorithm can significantly improve the neural modelling accuracy. The ROLS algorithm can also be applied to a large data set with much lower requirements on computer memory than the batch OLS algorithm.     

An online scheme for the isolation of BGP misconfiguration errors

Being the primary interdomain routing protocol, Border Gateway Protocol (BGP) is the singular means of path establishment across the Internet. Therefore, misconfiguration errors in BGP routers result in failure to establish paths which in turn can cause several networks to become unreachable. In this paper, we first analyze data from recent BGP tables to show that misconfiguration errors occur very frequently in the Internet today. We then show theoretically and using real-world events the impact of these errors on routing stability. A scheme for real-time isolation of large-scale BGP misconfiguration events is then proposed in this paper. Our methodology is based on statistical techniques and is evaluated using data from past wellknown misconfiguration events. We show the effectiveness of our method as compared to the current state-of-the-art.     

Analysis of externally pressurized porous gas journal bearings —II

A theoretical analysis of load-carrying capacity generated by vibration of the journal (the squeeze-film effect) of an externally pressurized porous gas journal is made. The flow of gas in the porous media is in three dimensions and obeys Darcy's law. The solution has been obtained by the perturbation method. The journal is assumed to vibrate either by translatory motion or by rotational motion around the transverse axis. The dimensionless squeeze load, moment, load- and moment-phase angles are given for various squeeze numbers, feeding parameters and a porosity number.     

Influence of carbonitriding defects on fatigue strength of 25KhGT gear teeth

Metal Science and Heat Treatment -     

Schrifttumsberichte

Ohne Zusammenfassung     

The wabush mines fire

How could a five-million-dollar fire occur in a seemingly low hazard industry? The author discusses one such fire and examines the lessons learned from it. It takes careful study to determine if well-known fire protection principles are being violated.     

The Main Directions for Increasing the Tool Life of a Metal Cutting Tool with Modified Working Parts

Journal of Machinery Manufacture and Reliability - In this paper, studies aimed to substantiate the directions of improving the reliability of a metal-cutting tool with working parts modified in...     

Infrarottrocknung von Furnieren

Zusammenfassung Es wurde über eine Versuchsreihe über die Infrarottrocknung von Furnieren berichtet, die zur Kl?rung offener Fragen beitragen sollte. Als Strahler wurden Philips-Lampen, 250 W, mit innen liegenden Reflektoren verwendet. Betrachtet man die Trocknungsgeschwindigkeit und die Erhitzungsgeschwindigkeit in Abh?ngigkeit von der Holzfeuchtigkeit, so lassen sich drei Perioden erkennen. Die Kurven haben ?hnlichkeit mit denen, die bei der Trocknung fester K?rper durch Konvektion erhalten werden. Der Energieverbrauch je kg Wasserentzug schwankte zwischen 1,6 und 5,2 kWh/kg. Der Zustand der getrockneten Furniere war zufriedenstellend. Der Wirkungsgrad wurde in den günstigen F?llen zu 59%, in den ungünstigen zu 30% ermittelt. Weitere Versuche sind geplant. Vorl?ufige Mitteilung.