Helmut Franken

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The forced oscillation technique used to determine the impedance of the respiratory system has been modified by measuring, instead of pressure and airflow at the mouth of the subject, the transfer function over a rigid tube. An exact description of the aerodynamic characteristics of a cylindrical conduit is needed in this method. Therefore, a line model was(More)
The measurement of the impedance of the respiratory system by means of the forced oscillation technique is disturbed by the breathing signal of the subject. The latter introduces systematic and random errors on the obtained impedance values. The size of these errors depends on the relative power of the breathing signal with respect to the forced oscillatory(More)
The respiratory impedances in healthy subjects and patients with advanced obstructive lung disease were measured between 2 and 32 Hz, using two forced oscillation techniques: the setup used previously by Grimby et al. (J. Clin. Invest. 47: 1455-1465, 1968) and a modified device in which the pneumotachograph is replaced by a 2-m-long tube and the ratio of(More)
role of credit in the economy by suggesting that the capital structure of the firm was mostly irrelevant. Moreover, the strong and robust correlation between money and real variables found in the empirical literature of the 1960s provided strong support for the view that the main transmission mechanism for monetary policy operates through changes in the(More)
The study of bank interest rate spreads is central to our understanding of the process of financial intermediation. Data limitations generally restrict empirical analyses to interest rate spreads that are constructed from bank income statements and balance sheets. In this paper we make use of a data set that allows us directly to compute interest rate(More)