We present a modification of a tangential frequency filtering decomposition (TFFD) preconditioner [1]. The key idea is to add a “lumping term” ch whose influence can be determined by means of Fourier analysis [2, 3]. For the standard five-point stencil, we derive an optimal order q = 4 3 , and constant c = (2π) 4 3 . With the choice of optimal order of modification, the Fourier results show tha...

The financial services industry is among the leading industries in IT-spending. Still, little research exists which investigates how IT influences the financial services sector. Against this background, we study how a technology which emerged within the last years affects securities trading: High-Frequency Trading (HFT). Hereby, we focus on HFT and its impact on market efficiency. On the basis ...

The main aim of this paper is to present recent knowledge about the assessment and evaluation of low frequency noise and infrasound close to the threshold of hearing and the potential effects on human health. Low frequency noise generated by air flowing over a moving car with the open window is chosen as a source of noise. The noise within the interior of the car and its effects on a driver’s c...

Objective To determine the familial frequency of vitiligo and its association with autoimmune disorders. Methods This cross-sectional study was conducted in the Department of Dermatology, Mayo Hospital, Lahore. Hundred patients of vitiligo of any age and either sex, diagnosed on the basis of history and clinical examination were enrolled from the outpatient department. Patients were evaluated f...

OFDM is defined as a form of multi-carrier modulation where the carrier spacing is carefully selected so that each sub carrier is orthogonal to the other sub carriers. As the sub carriers are orthogonal, the spectrum of each carrier has a null at the center frequency of each of the other carriers in the system. Orthogonal Frequency Division Multiplexing (OFDM) is a promising technique to perfor...

so that the gray-scale graphs can be viewed more clearly. This paper presents a fast adaptive time-frequency analysis method for dealing with the signals consisting of stationary components and transients, which are encountered very often in practice. It is developed based on the short-time Fourier transform but the window bandwidth varies along frequency adaptively. The method therefore behave...

BACKGROUND AND OBJECTIVES This study set out to determine the incidence of hypoglycemia in patients with chronic kidney disease (CKD), with and without diabetes, and the association of hypoglycemia with mortality. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS This was a retrospective cohort analysis of 243,222 patients who had 2,040,206 glucose measurements and were cared for at the Veterans ...

Methods: In this cross-sectional practice-based study, the clinic records of 1109 school-aged children (mean age and standard deviation 14.39 ± 3.39 years) were analysed. The sample comprised 427 (38.5%) male and 682 (61.5%) female patients between the ages of 6 and 19 years. Refractive errors were classified into various types, and the association between these refractive types and symptoms in...

Analysis of nonstationary signals, such as music signals, is a challenging task. The purpose of this study is to explore an efficient and powerful technique to analyze and classify music signals in higher frequency range (44.1 kHz). The pursuit methods are good tools for this purpose, but they aimed at representing the signals rather than classifying them as in Y. Paragakin et al., 2009. Among ...

.. Objectives: To assess common presenting features of children with abdominal pain and to determine role of High frequency & Doppler Ultrasound in evaluation of these patients. Material and Methods: This is a cross sectional study conducted from August 2012 to December 2012. Data from patients presenting for evaluation of abdominal pain was analyzed for presenting complaints and ultrasound fin...