3 research outputs found
Fault-Tolerant Strassen-Like Matrix Multiplication
In this study, we propose a simple method for fault-tolerant Strassen-like
matrix multiplications. The proposed method is based on using two distinct
Strassen-like algorithms instead of replicating a given one. We have realized
that using two different algorithms, new check relations arise resulting in
more local computations. These local computations are found using computer
aided search. To improve performance, special parity (extra) sub-matrix
multiplications (PSMMs) are generated (two of them) at the expense of
increasing communication/computation cost of the system. Our preliminary
results demonstrate that the proposed method outperforms a Strassen-like
algorithm with two copies and secures a very close performance to three copy
version using only 2 PSMMs, reducing the total number of compute nodes by
around 24\% i.e., from 21 to 16.Comment: 6 pages, 2 figure
Selenium and Vitamin E Modulates Radiation-Induced Liver Toxicity in Pregnant and Nonpregnant Rat: Effects of Colemanite and Hematite Shielding
The levels of liver lipid peroxidation, glutathione peroxidase, reduced
glutathione, and vitamins A and E were used to follow the level of
oxidative damage caused by ionizing radiation in pregnant rats. The
possible protective effects of selenium and vitamin E supplemented to
rats housed in concrete-protected cages using hematite and colemanite
were tested and compared to untreated controls. Ninety-six rats were
randomly divided into four main equal groups namely control (A), normal
concrete (B), concrete containing colemanite (C), and concrete
containing hematite (D). Except group A, all groups exposed to 7 Gy
radiation. The four main groups were divided into four subgroups each as
follows: subgroups 1 (n = 6): nonpregnant control rats. Subgroups 2 (n =
6): selenium and vitamin E combination was intraperitoneally (i.p.)
given to the nonpregnant rats for 20 days. Subgroups 3 (n = 6): pregnant
control rats. Subgroups 4 (n = 6): selenium and vitamin E combination
was i.p. given to the pregnant rats for concessive 20 days. Lactate
dehydrogenate, alkaline phosphates, and lipid peroxidation values were
higher in subgroups 1 and 3 than in no radiation group although
glutathione peroxidase and vitamin E levels in liver were lower in
radiation group than in no radiation group. Lactate dehydrogenate
activity and lipid peroxidation levels were found to be decreased in
subgroups 2 and 4 protected with concrete containing hematite and
colemanite when compared to subgroup 1 and 3 with normal concrete. The
radiation doses in rats housed by concrete without colemanite and
hematite exposed radiation clearly showed liver degeneration. In
conclusion, selenium and vitamin E supplementations and housing by
concrete with colemanite was found to offer protection against
gamma-irradiation-induced liver damage and oxidative stress in rats,
probably by exerting a protective effect against liver necrosis via its
free radical scavenging and membrane stabilizing. Protective effects of
colemanite in the liver seem to be more important than in hematite