We design efficient and distributed-memory parallel randomized direct solvers for large structured dense linear systems, including a fully matrix-free version based on matrix-vector multiplications and a partially matrix-free one. The dense coefficient matrix A has an off-diagonal low-rank structure, as often encountered in practical applications such as Toeplitz systems and discretized integra...

The recent explosion in the number of global health initiatives has dramatically changed the landscape of public health and international aid. During an initial honeymoon period, these initiatives started implementing their disease-specific activities in low-income countries. But the honeymoon is over, and there is now an increasing realisation that such initiatives ignore a wider problem—exist...

Poster presentation Some autistic children also have symptoms of depression, anxiety or obsessive-compulsive disorder (OCD). Aromatic anti-epileptic drugs (AEDs) may be used as a mood-stabilizing medication to treat these symptoms, including carbamazepine (CBZ), oxcarbazepine (OXCBZ), and lamotrigene (LMG). Moreover, one in every four autistic spectrum disorder children have seizures, the use o...

Lung sound signal (LSS) measurements are taken to aid in the diagnosis of various diseases. Their interpretation is difficult however due to the presence of interference generated by the heart. Novel digital signal processing techniques are therefore proposed to automate the removal of the heart sound signal (HSS) interference from the LSS measurements. The HSS is first assumed to be a periodic...

The ground state phase transition in the distorted S = 1 kagomé Heisenberg antiferromagnet (KHAF) is studied by means of the perturbational calculation and numerical exact diagonalization method. For strong √ 3× √ 3 lattice distortion, the hexgonal singlet solid (HSS) ground state of the uniform KHAF is destroyed and a new singlet state, the large HSS (LHSS) state, which is globally different f...

In this paper, an efficient divide-and-conquer (DC) algorithm is proposed for the symmetric tridiagonal matrices based on ScaLAPACK and the hierarchically semiseparable (HSS) matrices. HSS is an important type of rankstructured matrices. Most time of the DC algorithm is cost by computing the eigenvectors via the matrix-matrix multiplications (MMM). In our parallel hybrid DC (PHDC) algorithm, MM...

Multifunctional SiO2 · Re2O3 (Re = Y, Eu, La, Sm, Tb, Pr) hollow spheres (HSs) have been fabricated using an acidic Re3+ ion solution. Under ultraviolet radiation, functional HSs emit different colors of light according to the different rare-earth ions embedded into the shell of SiO2 hollow spheres. The as-prepared hollow capsules were characterized by X-ray diffraction, transmission electron m...

OBJECTIVE To compare the effects of a bolus infusion of hypertonic saline hydroxyethyl starch with the effects of normal saline (placebo) on intracranial pressure (ICP) and cerebral perfusion pressure in patients with spontaneous subarachnoid hemorrhage. DESIGN AND SETTING Prospective, randomized, single-blinded, placebo-controlled study in a university hospital. PATIENTS A total of 22 mech...

AIMS High shear stress (HSS) can have significant impact on angiogenesis and atherosclerosis in collateral arteries near the bifurcation and curvature regions. Here, we investigate the spatiotemporal pattern of HSS-induced intracellular calcium alteration. METHODS AND RESULTS Genetically encoded biosensors based on fluorescence resonance energy transfer were targeted in the cytoplasm and the ...

A novel method for segmentation of heart sounds (HSs) into single cardiac cycle (S1-Systole-S2-Diastole) using homomorphic filtering and K-means clustering is presented. Feature vectors were formed after segmentation by using Daubechies-2 wavelet detail coefficients at the second decomposition level. These feature vectors were then used as input to the neural networks. Grow and Learn (GAL) and ...