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Value-Aware low-power register file architecture
, Article CADS 2012 - 16th CSI International Symposium on Computer Architecture and Digital Systems ; 2012 , Pages 44-49 ; 9781467314824 (ISBN) ; Fazeli, M ; Ghalaty, N. F ; Miremadi, S. G ; Sharif University of Technology
2012
Abstract
In this paper, we propose a low power register file architecture for embedded processors. The proposed architecture, "Value-Aware Partitioned Register File (VAP-RF)", employs a partitioning technique that divides the register file into two partitions such that the most frequently accessed registers are stored in the smaller register partition. In our partitioning algorithm, we introduce an aggressive clock-gating scheme based on narrow-value registers to furthermore reduce power. Experimental results on an ARM processor for selected MiBench workloads show that the proposed architecture has an average power saving of 70% over generic register file structure
Software-based control flow error detection and correction using branch triplication
, Article Proceedings of the 2011 IEEE 17th International On-Line Testing Symposium, IOLTS 2011, 13 July 2011 through 15 July 2011 ; July , 2011 , Pages 214-217 ; 9781457710551 (ISBN) ; Fazeli, M ; Rad, H. I ; Miremadi, S. G ; Sharif University of Technology
2011
Abstract
Ever Increasing use of commercial off-the-shelf (COTS) processors to reduce cost and time to market in embedded systems has brought significant challenges in error detection and recovery methods employing in such systems. This paper presents a software based control flow error detection and correction technique, so called branch TMR (BTMR), suitable for use in COTS-based embedded systems. In BTMR method, each branch instruction is triplicated and a software interrupt routine is invoked to check the correctness of the branch instruction. During the execution of a program, when a branch instruction is executed, it is compared with the second redundant branch in the interrupt routine. If a...
A cache-assisted scratchpad memory for multiple-bit-error correction
, Article IEEE Transactions on Very Large Scale Integration (VLSI) Systems ; Volume 24, Issue 11 , 2016 , Pages 3296-3309 ; 10638210 (ISSN) ; Sadat Mirzadeh, N ; Farhady Ghalaty, N ; Miremadi, S. G ; Fazeli, M ; Asadi, H ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
Scratchpad memory (SPM) is widely used in modern embedded processors to overcome the limitations of cache memory. The high vulnerability of SPM to soft errors, however, limits its usage in safety-critical applications. This paper proposes an efficient fault-tolerant scheme, called cache-assisted duplicated SPM (CADS), to protect SPM against soft errors. The main aim of CADS is to utilize cache memory to provide a replica for SPM lines. Using cache memory, CADS is able to guarantee a full duplication of all SPM lines. We also further enhance the proposed scheme by presenting buffered CADS (BCADS) that significantly improves the CADS energy efficiency. BCADS is compared with two well-known...
A Post-Processor for Control Flow Checking of Jump and Branch Instructions
, M.Sc. Thesis Sharif University of Technology ; Miremadi, Ghasem (Supervisor)
Abstract
Ever increasing use of embedded systems has made them an inevitable part of human life. In 2006, more than 76% of fabricated microprocessors were used in embedded systems. On the other hand, the most important applications for embedded systems are the safty-critical applications and failure in these systems can ba catastrophic. Nowadays, the probability of transient faults has been increasing 8% with coming of the new age of fabrications. So, dependability has been an important concern for the desginers. Control flow checking has been one of the most important ways of avoding failurs.in this thesis a software control flow checking method has been introduced. This mechanism is based on branch...
Efficacy of a novel bioactive glass-polymer composite for enamel remineralization following erosive challenge
, Article International Journal of Dentistry ; Volume 2022 , 2022 ; 16878728 (ISSN) ; Heidari, S ; Najafi, F ; Hajihasani, M ; Noshiri, N ; Nazari, N. F ; Sharif University of Technology
Hindawi Limited
2022
Abstract
Introduction. Dental caries is the most common cause of tooth loss. However, it can be stopped by enhancing remineralization. Fluoride and casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) are among the most important remineralizing agents. Recent studies have used bioactive glass as a remineralizing agent in different forms. This study aimed to assess the efficacy of a composite paste (prepared by mixing urethane polypropylene glycol oligomer with bioactive glass powder for easier application). Materials and Methods. Enamel disks were cut out of the buccal surface of extracted sound third molars. The samples were randomly divided into 3 groups of 15 and underwent Vickers...
Wrist-RoboHab: A robot for treatment and evaluation of brain injury patients
, Article IEEE International Conference on Rehabilitation Robotics, 27 June 2011 through 1 July 2011, Zurich ; 2011 ; 19457898 (ISSN) ; 9781424498628 (ISBN) ; Farahmand, F ; Ansari, N. N ; Sharif University of Technology
2011
Abstract
This article, introduces a new haptic robot, wrist-RoboHab, for upper limb rehabilitation of post stroke, orthopedic and Parkinson patients., The robot is designed for hand movement therapy and could be used for both treatment and evaluation purposes in three operational states; forearm supination/pronation, wrist flexion/extension and ulnar/radial deviation. At first the mechanical design and control system are described. Then the results of a case study are demonstrated. Clinical results, showed an improvement in Fugle-Meyer, AROM, power and the biomechanical assessment of the spasticity in a chronic patient. Furthermore, it was approved that the robot can have a good interaction with...
Enhancing the photocatalytic performance of Ag3PO4 by incorporating g-C3N4 and MWCNTs: Optimisation of removal of Acid Blue 92
, Article Progress in Reaction Kinetics and Mechanism ; Volume 41, Issue 3 , 2016 , Pages 277-288 ; 14686783 (ISSN) ; Armandsefat, F ; Mohaghegh, N ; Ahmadinasab, N ; Sharif University of Technology
Science Reviews 2000 Ltd
2016
Abstract
The main aim of the present study was to enhance the degradation capacity of Acid Blue 92 (AB92) by visible-light-active Ag3PO4 nanocomposites based on g-C3N4 and Multiwalled Carbon Nanotubes (MWCNTs). The nanocomposites were fabricated through a tunable in situ deposition method. The properties of the resulting samples were investigated by X-ray diffraction, scanning electron microscopy and Fourier transform infrared (FTIR) spectroscopy. The photocatalytic activity results revealed that the Ag3PO4/g-C3N4 heterojunction inorganic/organic composite exhibited an improvement in both efficiency and the rate of AB92 photodegradation in comparison with the others. The enhanced photocatalytic...
Modeling behavior in compositions of software architectural primitives
, Article Proceedings - 19th International Conference on Automated Software Engineering, ASE 2004, Linz, 20 September 2004 through 24 September 2004 ; 2004 , Pages 371-374 ; 0769521312 (ISBN); 9780769521312 (ISBN) ; Medvidovic, N ; Sirjani, M ; Arbab, F ; Sharif University of Technology
2004
Abstract
Software architectures and architectural styles are increasingly used for designing large-scale software systems. Alfa is a framework for the composition of style-based software architectures from a small set of primitives. It models the behavior of architectural components and connectors as orderings among events at their inputs and outputs. Formalizing such behavior is useful for checking conformance of architectures to their styles. We therefore propose a formal approach that uses data-abstract constraint automata to model the behavior of Alfa's compositions, and to verify their behavioral style conformance. We have also developed an automated conformance analyzer for Alfa. © 2004 IEEE
Efficient Friedel-crafts alkylation of indoles and pyrrole with enones and nitroalkene in water
, Article Organic and Biomolecular Chemistry ; 2006, Volume 4, Issue 23, Pages 4275-4277 ; Arynasab, F ; Saidi, M. R ; Sharif University of Technology
Abstract
An operationally simple and entirely green protocol for heteropoly acid catalyst conjugate addition of indoles and pyrrole to unsaturated carbonyl compounds and nitro-alkene in water was investigated. It is important that the products arising from 1,2-addition were not observed under the reaction conditions. Pyrroles also readily underwent Michael addition at Α-positions under the same reaction conditions. Indole and many of its derivatives are present in many substances commonly found in nature. Micheal addition reactions are performed in organic solvents with the reactions in water are relatively scarce. The Michael addition between indole and methyl vinyl ketone in the presence of...
Straightforward and highly efficient catalyst-free one-pot synthesis of dithiocarbamates under solvent-free conditions
, Article Organic Letters ; Volume 8, Issue 23, 9 November 2006, Pages 5275-5277 ; Aryanadab, F ; Saidi, M. R ; Sharif University of Technology
Abstract
A highly efficient and simple synthesis of dithiocarbamates is possible based on the one-pot reaction of amines, CS2, and alkyl halides without using a catalyst under solvent-free conditions. The mild reaction conditions, high yields, and broad scope of the reaction illustrate the good synthetic utility of this method. The reaction is a highly atom-economic process for production of S-alkyl thiocarbamates and successfully can be used in high quantities in the pharmaceutical or agrochemical industries
Effect of soil types on the dynamic response of an embedded pipe in a typical slope
, Article 7th International Conference on Earthquake Geotechnical Engineering, ICEGE 2019, 17 January 2019 through 20 January 2019 ; 2019 , Pages 2316-2324 ; 9780367143282 (ISBN) ; Jafarzadeh, F ; Silvestri F ; Moraci N ; Sharif University of Technology
CRC Press/Balkema
2019
Abstract
The land-sliding forces applied to buried pipelines depend on the ground condition, types of loading and pipelines features. This paper intends to numerically investigate the effect of ground condition on pipelines. The loading type and pipeline features are kept constant. The pipeline which is positioned at mid-length of the slope, is made of steel and intersects the slope at the angle of 90o. The slope material specifications are determined based on geotechnical reports andthe harmonic loading simulates a 7.5 magnitude earthquake. The descending trend of slope displacement in sandy clay, loose to medium sand, cemented sand and medium to hard clayare shown by numerical calculations. But,...
Effect of soil types on the dynamic response of an embedded pipe in a typical slope
, Article 7th International Conference on Earthquake Geotechnical Engineering, ICEGE 2019, 17 January 2019 through 20 January 2019 ; 2019 , Pages 2316-2324 ; 9780367143282 (ISBN) ; Jafarzadeh, F ; Silvestri F ; Moraci N ; Sharif University of Technology
CRC Press/Balkema
2019
Abstract
The land-sliding forces applied to buried pipelines depend on the ground condition, types of loading and pipelines features. This paper intends to numerically investigate the effect of ground condition on pipelines. The loading type and pipeline features are kept constant. The pipeline which is positioned at mid-length of the slope, is made of steel and intersects the slope at the angle of 90o. The slope material specifications are determined based on geotechnical reports andthe harmonic loading simulates a 7.5 magnitude earthquake. The descending trend of slope displacement in sandy clay, loose to medium sand, cemented sand and medium to hard clayare shown by numerical calculations. But,...
TAMER: an adaptive task allocation method for aging reduction in multi-core embedded real-time systems
, Article Journal of Supercomputing ; 2020 ; Rohbani, N ; Baharvand, F ; Farbeh, H ; Sharif University of Technology
Springer
2020
Abstract
Technology scaling has exacerbated the aging impact on the performance and reliability of integrated circuits. By entering into nanotechnology era in recent years, the power density per unit of area has increased, which leads to a higher chip temperature. Aging in a chip is originated from multiple phenomena; all of them are intensified by increased temperature. Several circuit- and architecture-level schemes tried to mitigate the aging in the literature. However, these schemes are not sufficient for multi-core systems due to their unawareness of the unique constraints and features of these platforms. In this paper, we propose a system-level aging mitigation method, so-called Adaptive Task...
TAMER: an adaptive task allocation method for aging reduction in multi-core embedded real-time systems
, Article Journal of Supercomputing ; Volume 77, Issue 2 , 2021 , Pages 1939-1957 ; 09208542 (ISSN) ; Rohbani, N ; Baharvand, F ; Farbeh, H ; Sharif University of Technology
Springer
2021
Abstract
Technology scaling has exacerbated the aging impact on the performance and reliability of integrated circuits. By entering into nanotechnology era in recent years, the power density per unit of area has increased, which leads to a higher chip temperature. Aging in a chip is originated from multiple phenomena; all of them are intensified by increased temperature. Several circuit- and architecture-level schemes tried to mitigate the aging in the literature. However, these schemes are not sufficient for multi-core systems due to their unawareness of the unique constraints and features of these platforms. In this paper, we propose a system-level aging mitigation method, so-called Adaptive Task...
Monolithic quantum dot sensitized solar cells
, Article Journal of Physics D: Applied Physics ; Volume 46, Issue 48 , December , 2013 ; 00223727 (ISSN) ; Ghane, Z ; Ghazyani, N ; Tajabadi, F ; Taghavinia, N ; Sharif University of Technology
2013
Abstract
We report a new design of solar cells based on semiconductor quantum dots (QDs), monolithic quantum dot sensitized solar cells (MQDSCs). MQDSCs offer the prospect of having lower cost and a simpler manufacturing process in comparison to conventional double substrate QDSCs. Our proposed monolithic QDSCs have a triple-layer structure, composed of a CdS sensitized mesoporous TiO2 photoanode, a scattering layer made by a core-shell structure of TiO 2/SiO2, and a carbon active/graphite counter electrode layer, which are all deposited on a single fluorine doped tin oxide (FTO) glass substrate. Mesoporous TiO2 was sensitized with CdS QDs by successive ionic layer adsorption and reaction. Here,...
Pyromellitic dianhydride crosslinked cyclodextrin nanosponges for curcumin controlled release; formulation, physicochemical characterization and cytotoxicity investigations
, Article Journal of Microencapsulation ; Volume 36, Issue 8 , 2019 , Pages 715-727 ; 02652048 (ISSN) ; Zarrabi, A ; Caldera, F ; Trotta, F ; Ghias, N ; Sharif University of Technology
Taylor and Francis Ltd
2019
Abstract
Aim: In this study, a nanosponge structure was synthesised with capability of encapsulating curcumin as a model polyphenolic compound and one of the herbal remedies that have widely been considered due to its ability to treat cancer. Methods: FTIR, DSC and XRD techniques were performed to confirm the formation of the inclusion complex of the nanosponge-drug. Results: DSC and XRD patterns showed an increasing stability and a decreasing crystallinity of curcumin after formation of inclusion complex. Encapsulation efficiency was 98% (w/w) and a significant increase was observed in loading capacity (184% w/w). The results of cytotoxicity assessments demonstrated no cell toxicity on the healthy...
Evaluation of the effects of principal stress direction on shear modulus of unsaturated sand using hollow cylinder apparatus
, Article 7th International Conference on Earthquake Geotechnical Engineering, ICEGE 2019, 17 January 2019 through 20 January 2019 ; 2019 , Pages 3102-3108 ; 9780367143282 (ISBN) ; Ahmadi Givi, F ; Ahmadinezhad, A ; Silvestri F ; Moraci N ; Sharif University of Technology
CRC Press/Balkema
2019
Abstract
Determination of soil shear modulus is one of the most controversial topics in unsaturated soil dynamics. Due to the fact that soils have an anisotropic response, the shear strength and stiffness of geological materials are greatly dependent on the principal stress direction and the intermediate principal stress. In this study, the effects of principal stress direction on shear modulus of unsaturated medium-dense sand have been investigated using cyclic hollow cylinder apparatus. Three series of stress-controlled cyclic tests with different fixed principal stress directions were carried out on the sand sample under different values of suction. Results reveal that shear modulus of unsaturated...
Evaluation of the effects of principal stress direction on shear modulus of unsaturated sand using hollow cylinder apparatus
, Article 7th International Conference on Earthquake Geotechnical Engineering, ICEGE 2019, 17 January 2019 through 20 January 2019 ; Pages 3102-3108 , 2019 ; 9780367143282 (ISBN) ; Ahmadi Givi, F ; Ahmadinezhad, A ; Silvestri F ; Moraci N ; Sharif University of Technology
CRC Press/Balkema
2019
Abstract
Determination of soil shear modulus is one of the most controversial topics in unsaturated soil dynamics. Due to the fact that soils have an anisotropic response, the shear strength and stiffness of geological materials are greatly dependent on the principal stress direction and the intermediate principal stress. In this study, the effects of principal stress direction on shear modulus of unsaturated medium-dense sand have been investigated using cyclic hollow cylinder apparatus. Three series of stress-controlled cyclic tests with different fixed principal stress directions were carried out on the sand sample under different values of suction. Results reveal that shear modulus of unsaturated...
The metabolome profiling of obese and non-obese individuals: Metabolically healthy obese and unhealthy non-obese paradox
, Article Iranian Journal of Basic Medical Sciences ; Volume 23, Issue 2 , 2020 , Pages 186-194 ; Madani, N. H ; Ghoochani, B. F. N. M ; Safari Alighiarloo, N ; Khamseh, M. E ; Sharif University of Technology
Mashhad University of Medical Sciences
2020
Abstract
Objective(s): The molecular basis of “metabolically healthy obese” and “metabolically unhealthy non-obese” phenotypes is not fully understood. Our objective was to identify metabolite patterns differing in obese (metabolically healthy vs unhealthy (MHO vs MUHO)) and non-obese (metabolically healthy vs unhealthy (MHNO vs MUHNO)) individuals. Materials and Methods: This case-control study was performed on 86 subjects stratified into four groups using anthropometric and clinical measurements: MHO (21), MUHO (21), MHNO (22), and MUHNO (22). Serum metabolites were profiled using nuclear magnetic resonance (NMR). Multivariate analysis was applied to uncover discriminant metabolites, and enrichment...
Alkali-activated slag (AAS) paste: Correlation between durability and microstructural characteristics
, Article Construction and Building Materials ; Volume 267 , 2021 ; 09500618 (ISSN) ; Shariati, A ; Trung, N. T ; Shoaei, P ; Ameri, F ; Bahrami, N ; Zamanabadi, S. N ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
This study was aimed at evaluating the effects of alkali activator solution and utilization of silica fume (SF) on durability and microstructural characteristics of alkali-activated ground granulated blast furnace slag (GGBFS) pastes. The pastes were activated with sodium silicate (SS) blended with NaOH (SH) solution with molar concentrations of 8 M, 12 M, and 16 M and SS:SH ratios of 1.0, 2.5, and 4.0. The same mixes were prepared with SF as partial replacement of GGBFS at a dosage of 10% by weight. The initial and final water absorption as well as the electrical resistivity of the specimens were measured. The optimal paste fabricated with 12 M NaOH solution and SS:SH ratio of 2.5 showed...