Search results for " time"

Analysis of discrete and continuous distributions of ventilatory time constants from dynamic computed tomography.

2005

In this study, an algorithm was developed to measure the distribution of pulmonary time constants (TCs) from dynamic computed tomography (CT) data sets during a sudden airway pressure step up. Simulations with synthetic data were performed to test the methodology as well as the influence of experimental noise. Furthermore the algorithm was applied to in vivo data. In five pigs sudden changes in airway pressure were imposed during dynamic CT acquisition in healthy lungs and in a saline lavage ARDS model. The fractional gas content in the imaged slice (FGC) was calculated by density measurements for each CT image. Temporal variations of the FGC were analysed assuming a model with a continuous…

Fast electroclinic switching in a ferroelectric LC-polysiloxane

1992

Symbolic Reductionist Model for Program Comprehension

2007

This article presents the main features of a novel construction, symbolic analysis, for automatic source code processing. The method is superior to the known methods, because it uses a semiotic, interpretative approach. Its most important processes and characteristics are considered here. We describe symbolic information retrieval and the process of analysis in which it can be used in order to obtain pragmatic information. This, in turn, is useful in understanding a current Java program version when developing a new version.

A measurement of the K-S lifetime

2002

A measurement of the K_S lifetime is presented using data recorded by the NA48 experiment at the CERN-SPS during 1998 and 1999. The K_S lifetime is derived from the ratio of decay time distributions in simultaneous, collinear K_S and K_L beams, giving a result which is approximately independent of the detector acceptance and with reduced systematic errors. The result obtained is tau_S=(0.89598 +- 0.00048 +- 0.00051)x10^(-10) s, where the first error is statistical and the second systematic.

An analytical model of a new packet marking algorithm for TCP flows

2005

In Differentiated Services networks, packets may receive a different treatment according to their Differentiateo Services Code Point (DSCP) label. As a consequence, packet marking schemes can also be devised to differentiate packets belonging to a same TCP flow, with the goal of improving the performance experienced. This paper presents an analytical model for an adaptive packet marking scheme proposed in our previous work. The model combines three specific sub-models aimed at describing (i) the TCP sources aggregate, (ii) the marker, and (iii) the network status. Preliminary simulation results show quite accurate predictions for throughput and average queue occupancy. Besides, the research…

Dependence of Terahertz Emission and Detection in Photoconductive Antennas on Laser Parameters

In this study, we employ a standard Terahertz time-domain spectroscopy (THz-TDS) setup based on two photoconductive antennas (PCAs) for THz radiation generation and detection. The characterization of the emission and detection performance as a function of the input pulse wavelength and bandwidth is performed.

Reconfiguration du modèle conjugal à l'heure de l'hyperconnectivité : TIC et territoires de l'intime

2014

Online devices are part of our daily lives, fundamentally changing our habits and practices,especially as regards relationships as well as interpersonal and social communication.In this doctoral research, the aim was to analyse the ways in which Information and CommunicationTechnologies (ICTs) have somehow ‘reshaped’ the traditional conjugal model.Indeed, more than just technical devices, ICTs are communicational and even ‘transitional’devices. They are means of strategies and issues within the couple and the family. Theseincreasingly nomadic technologies question the couple regarding its foundations. First ofall, the phenomenon of hyper connectivity (or ‘continuous connectivity’) creates a…

Design & Optimization of Large Cylindrical Radomes with Subcell and Non-Orthogonal FDTD Meshes Combined with Genetic Algorithms

2021

The word radome is a contraction of radar and dome. The function of radomes is to protect antennas from atmospheric agents. Radomes are closed structures that protect the antennas from environmental factors such as wind, rain, ice, sand, and ultraviolet rays, among others. The radomes are passive structures that introduce return losses, and whose proper design would relax the requirement of complex front-end elements such as amplifiers. The radome consists mostly in a thin dielectric curved shape cover and sometimes needs to be tuned using metal inserts to cancel the capacitive performance of the dielectric. Radomes are in the near field region of the antennas and a full wave analysis of th…

Pašregulācijas stilu, tagadnes laika perspektīvu un darba intensitātes savstarpēja saistība

2017

Pētījuma “Pašregulācijas stilu, tagadnes laika perspektīvu un darba intensitātes savstarpēja saistība” mērķis bija noskaidrot kādas tagadnes laika perspektīvas un pašregulācijas stili prognozē darba intensitāti, un, vai pastāv saistība starp tagadnes laika perspektīvu, pašregulācijas stiliem un darba intensitāti. Dati tika ievākti no 148 strādājošiem cilvēkiem, kuri dzīvo dažādās Latvijas pilsētās, vecumā no 25 līdz 65 gadiem (vidējais vecums M = 38,03 gadi SD = 12,46), no kuriem 76 (51,35%) bija sievietes un 72 vīrieši (48,65%). Datu ievākšanai tika izmantotas šādas metodes: Pašregulācijas stilu aptauja, Tagadnes laika perspektīvas aptauja (TLPA) un Darba intensitātes aptauja. Visas metode…

Distribution of Working Time and Contents of Physiotherapy Activities in a Clinical Setting.

1994

The purpose of the present study was to collect personnel utilization data in the physiotherapy department of a general hospital as a basis for improving the practice of physiotherapy. Over a four-week period in a process of continuous observation 12 physiotherapists recorded their activities under predefined task categories. The percentages of total time used in the observed activities were as follows: direct patient treatment 31%, other work (planning, recording, arranging walking aids and student guidance) 10%, and cooperation (consultation, meetings, arranging patients' affairs, counselling relatives and parents) 9%. The proportion of uncategorized work amounted to half of the total wor…