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Analytical Design (analytical + design)

Distribution by Scientific Domains

Medical Sciences	50%

Selected Abstracts

Analytical design of a half-mode substrate integrated waveguide Wilkinson power divider

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2010
A. Suntives
Abstract This article presents a new approach in designing half-mode substrate integrated waveguide Wilkinson power dividers based on analytical relations. Even- and odd-mode analysis is used to determine the required value of the branch resistance and optimize the power divider performance, namely the output ports' isolation. In this manner, the design process for this microwave component is simplified and expedited, while an excellent correlation with full-wave simulations is maintained. Measurements of the fabricated prototype corroborate the calculated results and demonstrate a wide output-port isolation bandwidth of 71%. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1066,1069, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25145 [source]

Cervical cytology reading times: A comparison between thinprep imager and conventional methods

DIAGNOSTIC CYTOPATHOLOGY, Issue 9 2007
Elizabeth Davey MBBS
Abstract We aimed to compare the times cytologists spend reviewing cervical cytology slides processed by the ThinPrep Imager® (TPI) with times they spend examining conventional cytology (CC) slides. We also aimed to examine the effect of cytologists' experience on reading times. Using a cross-sectional analytical design, we analyzed routine laboratory data, collected retrospectively over 7 months, for 41 cytologists, including paired data for 20 who read both TPI and CC slides. For the 20 cytologists who read both types of cytology, the mean reading rate was 13.3 slides per hour for TPI slides and 6.1 slides per hour for CC slides. The mean within-reader difference between TPI and CC rates was 7.2 slides per hour (P < 0.001). For CC reading, mean times did not differ between those who were additionally trained to read TPI slides and those who only read CC. Slower readers had greater increases in speed when using the TPI compared with CC reading than did faster readers (P < 0.001). More experienced cytologists tended to read CC slides more quickly than did those less experienced, but experience did not affect TPI reading times or within-reader differences in reading times between cytology types. The TPI significantly reduced reading times compared with CC. This reduction was greater amongst slower readers, and was unrelated to experience. Diagn. Cytopathol. 2007;35:550,554. © 2007 Wiley-Liss, Inc. [source]

An analytical simulator for deploying IP telephony

INTERNATIONAL JOURNAL OF NETWORK MANAGEMENT, Issue 1 2009
K. Salah
Deploying IP telephony or voice over IP (VoIP) is a major and challenging task. This paper describes an analytical design and planning simulator to assess the readiness of existing IP networks for the deployment of VoIP. The analytical simulator utilizes techniques used for network flows and queuing network analysis to compute two key performance bounds for VoIP: delay and bandwidth. The simulator is GUI-based and has an interface with drag-and-drop features to easily construct any generic network topology. The simulator has an engine that automates and implements the analytical techniques. The engine determines the number of VoIP calls that can be sustained by the constructed network while satisfying VoIP QoS requirements and leaving adequate capacity for future growth. As a case study, the paper illustrates how the simulator can be utilized to assess the readiness to deploy VoIP for a typical network of a small enterprise. We have made the analytical simulator publicly available in order to improve and ease the process of VoIP deployment. Copyright © 2008 John Wiley & Sons, Ltd. [source]

Prevalence of respiratory symptoms among wheat flour mill workers in Ibadan, Nigeria

AMERICAN JOURNAL OF INDUSTRIAL MEDICINE, Issue 3 2004
FWACP, K.T. Ijadunola MBChB
Abstract Background While investigations into occupational health problems of various groups of workers have been conducted in Nigeria, so far, very little attention has been paid to the health status of workers in the grain industry. The prevalence of respiratory symptoms among wheat flour mill workers and control groups in a medium size industrial setting in Nigeria was studied. Methods The study employed a cross-sectional analytical design. Data were collected using structured interviews, work-site observations, and physical examination. Respondents consisted of 91 flour-millers, 30 matched internal controls from the maintenance unit of the same flour mill factory, and 121 matched external controls. Results Fifty-four percent of the flour-millers reported at least one respiratory symptom compared with 30% of the internal controls (P,<,0.05) and 19% of the external controls (P,<,0.001). Most symptoms were significantly more prevalent among the flour-millers compared with control subjects, and this trend was more evident amongst non-smokers than ex-smokers. Conclusions The study concluded that wheat flour mill workers in Nigeria, like grain workers elsewhere, were at an increased risk of developing both pulmonary and non-pulmonary symptoms compared with control subjects. The result has implications for improved dust control measures in the grain industry in Nigeria. Am. J. Ind. Med. 45:251,259, 2004. © 2004 Wiley-Liss, Inc. [source]