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Search Results: 1 - 10 of 325227 matches for " Darakhshan S "
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"Bone scan in Erdheime Chester disease "
"Eftekhari M,Darakhshan S,Vakili A,Fard Esfahani A
Iranian Journal of Nuclear Medicine , 1999,
Abstract: In spite of very high sensitivity, bone scan is quite nonspecific in evaluation of bony lesions. In interpretation of bone scan special attention to patient’s clinical presentation and correlation with other lab and imaging modalities should be paid. In this report a patient with Erdheim Chester disease a rare and unusual form of lipidosis is presented and the pattern of 99mTc-MDP bone scan and other imaging modalities are discussed.
Pan-private Algorithms: When Memory Does Not Help
Darakhshan Mir,S. Muthukrishnan,Aleksandar Nikolov,Rebecca N. Wright
Computer Science , 2010,
Abstract: Consider updates arriving online in which the $t$th input is $(i_t,d_t)$, where $i_t$'s are thought of as IDs of users. Informally, a randomized function $f$ is {\em differentially private} with respect to the IDs if the probability distribution induced by $f$ is not much different from that induced by it on an input in which occurrences of an ID $j$ are replaced with some other ID $k$ Recently, this notion was extended to {\em pan-privacy} where the computation of $f$ retains differential privacy, even if the internal memory of the algorithm is exposed to the adversary (say by a malicious break-in or by fiat by the government). This is a strong notion of privacy, and surprisingly, for basic counting tasks such as distinct counts, heavy hitters and others, Dwork et al~\cite{dwork-pan} present pan-private algorithms with reasonable accuracy. The pan-private algorithms are nontrivial, and rely on sampling. We reexamine these basic counting tasks and show improved bounds. In particular, we estimate the distinct count $\Dt$ to within $(1\pm \eps)\Dt \pm O(\polylog m)$, where $m$ is the number of elements in the universe. This uses suitably noisy statistics on sketches known in the streaming literature. We also present the first known lower bounds for pan-privacy with respect to a single intrusion. Our lower bounds show that, even if allowed to work with unbounded memory, pan-private algorithms for distinct counts can not be significantly more accurate than our algorithms. Our lower bound uses noisy decoding. For heavy hitter counts, we present a pan private streaming algorithm that is accurate to within $O(k)$ in worst case; previously known bound for this problem is arbitrarily worse. An interesting aspect of our pan-private algorithms is that, they deliberately use very small (polylogarithmic) space and tend to be streaming algorithms, even though using more space is not forbidden.
Limits of Approximation Algorithms: PCPs and Unique Games (DIMACS Tutorial Lecture Notes)
Prahladh Harsha,Moses Charikar,Matthew Andrews,Sanjeev Arora,Subhash Khot,Dana Moshkovitz,Lisa Zhang,Ashkan Aazami,Dev Desai,Igor Gorodezky,Geetha Jagannathan,Alexander S. Kulikov,Darakhshan J. Mir,Alantha Newman,Aleksandar Nikolov,David Pritchard,Gwen Spencer
Computer Science , 2010,
Abstract: These are the lecture notes for the DIMACS Tutorial "Limits of Approximation Algorithms: PCPs and Unique Games" held at the DIMACS Center, CoRE Building, Rutgers University on 20-21 July, 2009. This tutorial was jointly sponsored by the DIMACS Special Focus on Hardness of Approximation, the DIMACS Special Focus on Algorithmic Foundations of the Internet, and the Center for Computational Intractability with support from the National Security Agency and the National Science Foundation. The speakers at the tutorial were Matthew Andrews, Sanjeev Arora, Moses Charikar, Prahladh Harsha, Subhash Khot, Dana Moshkovitz and Lisa Zhang. The sribes were Ashkan Aazami, Dev Desai, Igor Gorodezky, Geetha Jagannathan, Alexander S. Kulikov, Darakhshan J. Mir, Alantha Newman, Aleksandar Nikolov, David Pritchard and Gwen Spencer.
The effect of maternal breast variations on neonatal weight gain in the first seven days of life
Reza Vazirinejad, Shokoofeh Darakhshan, Abbas Esmaeili, Shiva Hadadian
International Breastfeeding Journal , 2009, DOI: 10.1186/1746-4358-4-13
Abstract: In this prospective cohort study, 100 healthy term neonates were followed from birth to day seven in two groups; Group A: fifty neonates born to mothers with specified breast variations and Group B: fifty neonates born to mothers without such breast variations ("normal breasts"). All neonates were the first child of their families and there was no sex ratio difference between the two groups. Neonates' weight at birth and day seven were measured and the mean weight differences in the two groups were compared using paired t-test.Neonates born to mothers without the specified breast variations had a mean weight gain of (+) 53 ± 154.4 g at day seven., Not only there was no increase in the mean weight of neonates in the other group, but they had a mean decrease of weight of (-) 162 ± 125.5 g by the seventh day of their life compared to birth weight. Thus, neonates born to mothers without breast variations had significantly greater weight gain than neonates born to the mothers with the specified variations (p < 0.01).Breast variation among first-time mothers acts as an important barrier to weight gain among breastfed neonates in the early days of life. Health professionals need skills in the management of breastfeeding among mothers with the specified breast variations, so that mothers are given appropriate advice on how to breastfeed and overcome these problems.Breastfeeding success depends on appropriate attachment of the infant at the breast, in which the nipple and much of the areola are drawn well into the baby's mouth [1]. Anatomical variations of the breast, including flat nipple, inverted nipple, large breast and large nipple may act as barriers for the baby to latch on to the breast effectively. Babies need to have good attachment to the breast for successful breastfeeding and potential maternal problems such as these variations can make good attachment hard to achieve. Also, infant problems such as tongue-tie can be important [2-4].Despite many studies conducted
The relationship between serum magnesium level and febrile convulsion in 6 months to 6 years old children
Reza Derakhshan,Parisa Balaee,Hamid Bakhshi,Shokoofe Darakhshan
Zahedan Journal of Research in Medical Sciences , 2010,
Abstract: Background: The pathogenesis of febrile convulsion (FC) which is the most frequent seizure disorder in childhood isn’t clear but changes in the serum level of neurotransmitters and trace elements such as magnesium are known to contributing risk factors.Materials and Methods: In this case-control study serum magnesium of 32 children with FC and 33 children without FC were compared. Results: 25% of children with FC had serum magnesium level under 1.5 mg/dl. In the normal group no one had serum magnesium level under 1.5 mg/dl (p=0.05).Conclusion: Decreasing serum level in FC may be one contributing factor in the FC. It does not need to be lower than normal range in these groups of patients
Attenuation of Restraint-induced Anorexia and Anxiogenic Behavior by Serotonin-1A Agonists in Rats
Noreen Samad,Tahira Parveen,Saida Haider,Darakhshan Jabeen Haleem
Journal of Medical Sciences , 2005,
Abstract: The present study was designed to investigate the effects of buspirone (a partial 5-HT 1A receptor agonist) and 8-hydroxy-2-(di-n-propylamino) tetraline (8-OH-DPAT, a full 5-HT 1A receptor agonist) on restraint-induced behavioral deficits. Exposure to a single episode of 2 h restraint stress decreased food intake, growth rate and elicited anxiogenic like behavior in rats. Prior administration of buspirone and 8-OH-DPAT attenuated stress-induced behavioral deficits of food intake and exploratory activity in a light-dark box. Novelty-induced anxiety in unrestrained animals was also diminished by prior administration of 8-OH-DPAT but not buspirone. The effects on the attenuation of restraint-induced anorexia were greater in 8-OH-DPAT than buspirone injected animals. The results are discussed in the context of a role of somatodendritic as well as postsynaptic 5-HT 1A receptors in the attenuation of restraint-induced behavioral deficits.
Behavioral and Neurochemical Studies in Stressed and Unstressed Rats Fed on Protein, Carbohydrate and Fat Rich Diet
Samia Moin§, Saida Haider*, Saima Khaliq1, Saiqa Tabassum and Darakhshan J. Haleem
Pakistan Veterinary Journal , 2012,
Abstract: Stress produces behavioral and neurochemical deficits. To study the relationship between adaptation to stress and macronutrient intake, the present study was designed to monitor the effects of different diets on feed intake, growth rate and serotonin (5-Hydroxytryptamine, 5-HT) metabolism following exposure to restraint stress in rats. Rats were divided into four groups (n=12) as control, sugar, protein and fat rich diet fed rats. After 5 weeks of treatment animals of each group were divided into unrestrained and restrained animals (n=6). Rats of restrained group were given immobilization stress for 2 hours/day for 5 days. Food intake and growth rates of unrestrained and restrained rats were monitored daily. Rats were decapitated on 6th day to collect brain samples for neurochemical estimation. Results show that sugar diet fed rats produced adaptation to stress early as compared to normal diet fed rats. Food intake and growth rates of unrestrained and restrained rats were comparable on 3rd day in sugar diet fed rats and on 4th day in normal diet fed rats. Stress decreased food intake and growth rates of protein and fat treated rats. Repeated stress did not alter brain 5-HT and 5-HIAA levels of normal diet fed rats and sugar diet fed rats. Protein diet fed restrained rats showed elevated brain 5-HT levels. Fat diet fed restrained rats significantly decreased brain TRP and 5-HIAA levels. Finding suggested that carbohydrate diet might protect against stressful conditions. Study also showed that nutritional status could alter different behaviors in response to a stressful environment.
Postpartum spontaneous colonic perforation due to antiphospholipid syndrome
Kamran Ahmed, Amir Darakhshan, Eleanor Au, Munther A Khamashta, Iraklis E Katsoulis
World Journal of Gastroenterology , 2009,
Abstract: The antiphospholipid syndrome (APS) is a multi-systemic disease being characterized by the presence of antiphospholipid antibodies that involves both arterial and venous systems resulting in arterial or venous thrombosis, fetal loss, thrombocytopenia, leg ulcers, livedo reticularis, chorea, and migraine. We document a previously unreported case of a 37-year-old female in whom APS was first manifested by infarction and cecal perforation following cesarean section. At laparotomy the underlying cause of colonic perforation was not clear and after resection of the affected bowel an ileo-colostomy was performed. The diagnosis of APS was established during post-operative hospital stay and the patient was commenced on warfarin. Eventually, she made a full recovery and had her stoma reversed after 4 mo. Pregnancy poses an increased risk of complications in women with APS and requires a more aggressive approach to the obstetric care. This should include full anticoagulation in the puerperium and frequent doppler ultrasound monitoring of uterine and umbilical arteries to detect complications such as pre-eclampsia and placental insufficiency.
Study of the Structural and Electrical Properties of Cr-Doped BiFeO3 Ceramic  [PDF]
S. S. Arafat, S. Ibrahim
Materials Sciences and Applications (MSA) , 2017, DOI: 10.4236/msa.2017.810051
Abstract: Multiferroic BiFe1-xCrxO3 (x = 0.2 and 0.4) ceramics were synthesized in a single phase. The effects of Cr3+ substitution on the crystal structure, dielectric permittivity and leakage current were investigated. Preliminary X-ray structural studies revealed that the samples had a rhombohedral perovskite crystal structure. The dielectric constant ε' significantly increased while the dielectric loss tanδ was substantially decreased with the increase in Cr3+ substitution. The temperature effect on the dielectric properties exhibited an anomaly corresponding to magneto-electric coupling in the samples and was shifted to lower temperatures with the increase in Cr3+ substitution. The leakage current density also reduced in magnitude with the increase in the Cr3+ substitution.
Degree Splitting of Root Square Mean Graphs  [PDF]
S. S. Sandhya, S. Somasundaram, S. Anusa
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.66086
Abstract: Let \"\" be an injective function. For a vertex labeling f, the induced edge labeling \"\" is defined by, \"\" or \"\"; then, the edge labels are distinct and are from \"\". Then f is called a root square mean labeling of G. In this paper, we prove root square mean labeling of some degree splitting graphs.
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