Abstract. In this note, a new concept called SDR-matrix is proposed, which is an infinite lower triangular matrix obeying the generalized rule of David star. Some basic properties of SDR-matrices are discussed and two conjectures on SDR-matrices are presented, one of which states that if a matrix is a SDR-matrix, then so is its matrix inverse (if exists).

BACKGROUND Selective dorsal rhizotomy (SDR) is a surgical method used to treat childhood spastic cerebral palsy (CP). However, the effects of early SDR on functional outcomes and quality of life decades later in adulthood remains to be elucidated. OBJECTIVES To evaluate the long-term outcomes in terms of satisfaction and mobility of adult patients who received childhood SDR. METHODS Adult p...

Sufficient dimension reduction (sdr) is an effective tool for reducing highdimensional predictor spaces in regression problems. sdr achieves dimension reduction without loss of any regression information and without the need to assume any particular parametric form of a model. This is particularly useful for high-dimensional applications such as data mining, marketing, and bioinformatics. Howev...

This paper discusses a novel architecture for a Hybrid Fiber Radio (HFR) access network using Software Defined Radio (SDR) in a combined Base Station (BS) headend unit. While most of the current SDR approaches consider software radio to be used in the portable terminals to allow multi-mode operation, we propose a SDR-HFR based access network architecture. The combination of HFR and SDR allows s...

Socially desirable responding (SDR) has been widely studied with regards to personality assessment due to fears it may attenuate the predictive validity of decisions made using such assessments (e.g., in personnel selection). A number of scales have been employed to assess individual differences in response distortion. We expand the nomological net for a popular measure of social desirability –...

Socially desirable responding (SDR) is typically defined as the tendency to give positive self-descriptions . Its status as a response style rests on the clarification of an underlying psychological construct. A brief history of such attempts is provided . Despite the growing consensus that there are two dimensions of SDR, their interpretation has varied over the years from minimalist operation...

We provide a sufficient condition on a class of compact basic semialgebraic sets K ⊂ R for their convex hull co(K) to have a semidefinite representation (SDr). This SDr is explicitly expressed in terms of the polynomials gj that define K. Examples are provided. We also provide an approximate SDr; that is, for every fixed ! > 0, there is a convex set K! such that co(K) ⊆ K! ⊆ co(K) + !B (where B...

Historically, the military has used special purpose Global Positioning System (GPS) radios for radio navigation. This has the disadvantage of locking users into fixed technology solutions designed to meet a fixed set of requirements. Software Defined Radios (SDR) have the advantage of being able to easily adapt to provide new capabilities using current generation technology. Continued improveme...

Software defined radar (SDR) is a multi-purpose radar system where most of the hardware processing is performed by software. This paper introduces a concept and technology trends of software defined radar, and addresses the advantages and limitations of the current SDR radar systems. For the advanced SDR concept, the KAU SDR Model (KSM) is presented for the multimode and multiband radar system ...

OBJECTIVE: To evaluate the results of treatment in patients with pulmonary tuberculosis (TB) resistant to one antituberculosis drug (single drug resistance [SDR]) or to more than one drug (polyresistance [PDR]), excluding patients with resistance to the combination of isoniazid and rifampicin (multidrug resistance). PATIENTS AND METHOD: Retrospective review of all the records of patients with p...