http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Power-aware performance analysis of self-adaptive resource management in IaaS clouds
Ataie, Ehsan,Entezari-Maleki, Reza,Etesami, Sayed Ehsan,Egger, Bernhard,Ardagna, Danilo,Movaghar, Ali North-Holland 2018 Future generations computer systems Vol.86 No.-
<P><B>Abstract</B></P> <P>In this paper, Stochastic Activity Networks (SANs) are used to model and evaluate the performance and power consumption of an Infrastructure-as-a-Service (IaaS) cloud. The proposed SAN model is scalable and flexible, yet encompasses some details of an IaaS cloud, such as Virtual Machine (VM) provisioning, VM multiplexing, and failure/repair behavior of VMs. Using the proposed SAN, a power-aware self-adaptive resource management scheme is presented for IaaS clouds that automatically adjusts the number of powered-on Physical Machines (PMs) regarding variable workloads in different time intervals. The proposed scheme respects user-oriented metrics by avoiding Service Level Agreement (SLA) violations while taking provider-oriented metrics into consideration. The behavior of the proposed scheme is analyzed when the arriving workload changes, and then its performance is compared with two non-adaptive baselines based on diverse performance and power consumption measures defined on the system. A validation of the proposed SAN model and the resource management scheme against an adapted version of the CloudSim framework is also presented.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An analytical model is proposed for Infrastructure-as-a-Service (IaaS) clouds taking several details of such systems into consideration. </LI> <LI> A self-adaptive power-aware and Service Level Agreement (SLA)-aware resource management scheme is presented for cloud systems. </LI> <LI> The presented scheme adjusts the number of powered-on Physical Machines (PMs) according to the input workload. </LI> <LI> A validation of the proposed model and scheme against the CloudSim framework is presented. </LI> </UL> </P>
Amin Ataie,Masoumeh Sabetkasaei,Abbas Haghparast,Akbar Hajizadeh Moghaddam,Ramin Ataee,Shiva Nasiraei Moghaddam 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.4
Aging is the major risk factor for neurodegenerative diseases and oxidative stress and is involved in their pathophysiology. Oxidative stress can induce neuronal damage and modulate intracellular signaling, ultimately leading to neuronal death by apoptosis or necrosis. In this study we investigated the neuroprotective properties of the natural polyphenolic antioxidant compound, curcumin, against homocysteine (Hcy) neurotoxicity. Curcumin (5, 15, or 45mg/kg) was injected intraperitoneally once daily for a period of 10 days beginning 5 days prior to Hcy (0.2μmol/μL) intracerebroventricular injection in rats. Biochemical and behavioral studies, including passive avoidance learning and locomotor activity tests, were evaluated 24 hours after the last injection of curcumin or vehicle. Results indicated that Hcy induces lipid peroxidation and increases malondialdehyde (MDA) and superoxide anion (SOA) levels in whole rat brain. In addition, Hcy impaired memory retention in the passive avoidance learning test. However, curcumin treatment significantly decreased MDA and SOA levels and improved learning and memory in rats. These results suggest that Hcy may induce lipid peroxidation in rat brain and that polyphenol treatment (curcumin) improves learning and memory deficits by protecting the nervous system against oxidative stress.
Synthesis of Nano-Structured La0.8Ba0.2MnO3 Perovskite via a Mechano-Thermal Route
Zoya Sadighi,Abolghasem Ataie,Mohammad Reza Barati 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.1
In this study, barium-doped lanthanum manganite, La0.8Ba0.2MnO3, was synthesized via a mechano-thermalroute employing high energy ball milling and subsequent heat treatment. The structural evolution, morphol-ogy and thermal behaviour of the powders were evaluated using XRD, FESEM, and DTA/TGA, respectively. DTA/TGA results showed that the calcination temperature of the carbonates significantly decreased byincreasing the milling time. The results revealed that single phase perovskite was formed at 900 °C in amilled sample for 2 h and this temperature decreased to 600 °C by increasing the milling time to 30 h. Themean crystallite size also decreased from 32 to 20 nm by increasing the milling time from 2 to 30 h. Thereaction sequence of La0.8Ba0.2MnO3 formation via the mechano-thermal route is proposed using XRD andDTA/TGA results. FESEM micrographs showed that the mean particle size of the perovskite phase isincreased slightly from 30 to 40 nm by increasing the heat treatment temperature from 600 to 900 °C.
A Product Inhibition Study on Adenosine Deaminase by Spectroscopy and Calorimetry
(Ali Akbar Saboury),(Ghasem Ataie Jafari),(Ali Akbar Moosavi Movahedi),(Mohammad Reza Housaindokht),(Gholam Hosain Hakimelahi),(Adeleh Divsalar) 생화학분자생물학회 2002 BMB Reports Vol.35 No.3
Kinetic and thermodynamic studies have been made on the effect of the inosine product on the activity of adenosine deaminase in a 50 mM sodium phosphate buffer, pH 7.5, at 27oC using UV spectrophotometry and isothermal titration calorimetry (ITC). A competitive inhibition was observed for inosine as a product of the enzymatic reaction. A graphical-fitting method was used for determination of the binding constant and enthalpy of inhibitor binding by using isothermal titration microcalorimetry data. The dissociation-binding constant is equal to 140 μM by the microcalorimetry method, which agrees well with the value of 143 μM for the inhibition constant that was obtained from the spectroscopy method.
Mechano-Thermal Treatment of TiO_2-Al Powder Mixture to Prepare TiAl/Al_2O_3 Composite
Somaye Alamolhoda,Saeed Heshmati-Manesh,Abolghasem Ataie 대한금속·재료학회 2011 METALS AND MATERIALS International Vol.17 No.5
In this research, a composite comprising an intermetallic matrix and dispersed Al_2O_3 particles was processed. A mixture of TiO_2 and Al was mechanically activated in the presence of a process control agent and/or without it, in a high-energy planetary ball mill. As a subsequent process, the sample was sintered at various temperatures. The phase composition and morphology of the samples were evaluated by XRD and SEM techniques, respectively. The thermal behavior of the samples milled for 8 h with PVA and/or without it, were also assessed by the DTA technique and compared with one another. The DTA results revealed that addition of PVA shifted the aluminothermic reduction of TiO_2 to higher temperatures; therefore, final composite phases were developed at higher temperatures. The results also showed that addition of PVA during milling caused the final microstructure to coarsen. The XRD pattern of the sample sintered at 700 °C exhibits the existence of TiAl, Ti_3Al, and Al_2O_3 phases. In the sample sintered at 850 °C, the remaining Ti_3Al peak was attenuated and completely disappeared at 1000 °C.
S. Shakibhamedan,S. Sheibani,A. Ataie 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
In this paper, the effects of Cu coating of carbon nanotube (CNTs) as reinforcement on structural, microstructural, physicaland mechanical properties of Cu–3 wt%CNT nanocomposite were investigated. CNTs were coated by Cu using the electrolesstechnique for 1 and 2 h. Bulk nanocomposite samples were produced by spark plasma sintering of a mechanically milledpowder mixture of Cu and CNT. Kinetic study showed a nucleation and growth mechanism for the Cu coating process. Microstructural characterization showed that the coated CNTs dispersed more homogeneously in the powder mixture. Resultsalso revealed that 1 h coating of CNTs led to the higher relative density and thermal properties. The coating process increased62 Brinell hardness (BHN) in hardness, 14% IACS in electrical conductivity for Cu–CNT nanocomposite. Transmissionelectron microscopy analysis showed a strong bonding between CNT and Cu matrix within the distinguishable interface. About 20 MPa increase in shear strength of nanocomposite was observed by 1 h coating of CNTs. Also, the fracture surfacesexhibit changes in the mode of fracture by well-bonded CNTs with the Cu matrix. The coefficient of thermal expansion andthermal distortion parameter revealed 12.7 ppm/k and 0.037 ppm.m/w for the sample including 1 h coated CNT, respectively.
A Product Inhibition Study on Adenosine Deaminase by Spectroscopy and Calorimetry
Saboury, Ali Akbar,Divsalar, Adeleh,Jafari, Ghasem Ataie,Moosavi-Movahedi, Ali Akbar,Housaindokht, Mohammad Reza,Hakimelahi, Hosain 생화학분자생물학회 2002 Journal of biochemistry and molecular biology Vol.35 No.3
Kinetic and thermodynamic studies have been made on the effect of the inosine product on the activity of adenosine deaminase in a 50 mM sodium phosphate buffer, pH 7.5, at $27^{\circ}C$ using UV spectrophotometry and isothermal titration calorimetry (ITC). A competitive inhibition was observed for inosine as a product of the enzymatic reaction. A graphical-fitting method was used for determination of the binding constant and enthalpy of inhibitor binding by using isothermal titration microcalorimetry data. The dissociation-binding constant is equal to $140\;{\mu}M$ by the microcalorimetry method, which agrees well with the value of $143\;{\mu}M$ for the inhibition constant that was obtained from the spectroscopy method.
Consolidation of Nano-Crystalline Copper Powder by Cold and Hot Pressing
A. Saleh,S. Heshmati-Manesh,S. Sheibani,A. Ataie 대한금속·재료학회 2011 METALS AND MATERIALS International Vol.17 No.5
This paper investigates preparation of bulk nano-structured Cu through cold and hot pressing. In particular,the effects of different consolidation parameters, such as temperature and pressure, on the properties of bulk nano-structured samples were studied. Microstructure, density, hardness, and electrical conductivity showed strong dependence on the consolidation parameters. All results were compared with those for micron-size Cu powder. Relatively fully dense compacts with minimal grain growth up to 57 nm, maximum hardness of 83 Vickers, and electrical resistivity of 1.93 × 10^(−8)Ω.m could be achieved.
Heshmat, Ramin,shafiee, Gita,Kelishadi, Roya,Babaki, Amir Eslami Shahr,Motlagh, Mohammad Esmaeil,Arefirad, Tahereh,Ardalan, Gelayol,Ataie-Jafari, Asal,Asayesh, Hamid,Mohammadi, Rasool,Qorbani, Mostafa The Korean Nutrition Society 2015 Nutrition Research and Practice Vol.9 No.4
BACKGROUND/OBJECTIVES: Although the association of body mass index (BMI) with metabolic syndrome (MetS) is well documented, there is little knowledge on the independent and joint associations of BMI and physical activity with MetS risk based on a continuous scoring system. This study was designed to explore the effect of physical activity on interactions between excess body weight and continuous metabolic syndrome (cMetS) in a nationwide survey of Iranian children and adolescents. SUBJECTS/METHODS: Data on 5,625 school students between 10 and 18 years of age were analyzed. BMI percentiles, screen time activity (STA), leisure time physical activity (LTPA) levels, and components of cMetS risk score were extracted. Standardized residuals (z-scores) were calculated for MetS components. Linear regression models were used to study the interactions between different combinations of cMetS, LTPA, and BMI percentiles. RESULTS: Overall, 984 (17.5%) subjects were underweight, whereas 501 (8.9%) and 451 (8%) participants were overweight and obese, respectively. All standardized values for cMetS components, except fasting blood glucose level, were directly correlated with BMI percentiles in all models (P-trend < 0.001); these associations were independent of STA and LTPA levels. Linear associations were also observed among LTPA and standardized residuals for blood pressure, high-density lipoprotein, and waist circumference (P-trend < 0.01). CONCLUSIONS: Our findings suggest that BMI percentiles are associated with cMetS risk score independent of LTPA and STA levels.