NURA: A framework for supporting non-uniform resource accesses in GPUs

, Article Performance Evaluation Review ; Volume 50, Issue 1 , 2022 , Pages 39-40 ; 01635999 (ISSN) Darabi, S ; Mahani, N ; Baxishi, H ; Yousefzadeh, E ; Sadrosadati, M ; Sarbazi Azad, H ; Sharif University of Technology

Association for Computing Machinery 2022

Abstract

Multi-application execution in Graphics Processing Units (GPUs), a promising way to utilize GPU resources, is still challenging. Some pieces of prior work (e.g. spatial multitasking) have limited opportunity to improve resource utilization, while others, e.g. simultaneous multi-kernel, provide fine-grained resource sharing at the price of unfair execution. This paper proposes a new multi-application paradigm for GPUs, called NURA, that provides high potential to improve resource utilization and ensure fairness and Quality-of-Service(QoS). The key idea is that each streaming multiprocessor (SM) executes the Cooperative Thread Arrays (CTAs) that belong to only one application (similar to...

Kinetic and mechanistic study of p-nitrochlorobenzene photoreduction and Bacillus inactivation over aluminosilicate-based nanocomposites

, Article Monatshefte fur Chemie ; Volume 144, Issue 5 , 2013 , Pages 589-596 ; 00269247 (ISSN) Padervand, M ; Salari, H ; Darabi, F. S ; Gholami, M. R ; Sharif University of Technology

2013

Abstract

Photocatalytic reduction of p-nitrochlorobenzene was studied over aluminosilicate-based AgBr and AgBr-TiO2 photocatalysts which were prepared and characterized. The photoreaction was performed in the presence of LiBH4, which is a strong reducing agent, in the solution medium. A new mechanism is proposed for reduction of p-nitrochlorobenzene under photocatalytic conditions. The effect of pH, illumination source, LiBH 4 concentration, temperature, catalyst dosage, and alcoholic scavengers was also studied. The results showed that the best efficiency was obtained over Ag/AgBr/TiO2/aluminosilicates at natural pH under UV light. We observed that the reaction yield was affected by changing the...

Conformational study of a strained tolanophane by dynamic 1H NMR spectroscopy and computational methods

, Article Monatshefte fur Chemie ; Volume 139, Issue 10 , 2008 , Pages 1185-1189 ; 00269247 (ISSN) Darabi, H. R ; Azimzadeh Arani, M ; Tafazzoli, M ; Ghiasi, M ; Sharif University of Technology

2008

Abstract

The existence of a short C-H⋯π (alkyl-alkyne) interaction in the structure of a strained and relatively rigid tolanophane is expected to hinder the rotation about the C-C sp3 single bond. Variable-temperature NMR experiments (performed in three solvents, CDCl3, THF-d8, and acetone-d6) and ab initio density functional calculations were carried out to investigate its dynamic nature. An energy barrier of 48.6 kJ/mol is determined at coalescence (210 K) with acetone-d6 which is in good agreement with calculation result (54 kJ/mol). © 2008 Springer-Verlag

Molecular dynamics simulation of crack propagation in fcc materials containing clusters of impurities

, Article Mechanics of Materials ; Volume 38, Issue 3 , 2006 , Pages 243-252 ; 01676636 (ISSN) Rafii Tabar, H ; Shodja, H. M ; Darabi, M ; Dahi, A ; Sharif University of Technology

2006

Abstract

Molecular dynamics simulation method was employed to model mode I crack propagation in plates containing nanoscale clusters of impurities located in the vicinity of the crack tip. The plates and the clusters were considered to have an fcc structure. The interactions between the dissimilar atoms in the plates and clusters were modeled via the many-body Sutton-Chen inter-atomic potentials [Sutton, A.P., Chen, J., 1990. Long-range Finnis-Sinclair potentials. Philos. Mag. Lett. 61, 139-164], and their extended versions developed for fcc alloys by [Rafii-Tabar, H., Sutton, A.P., 1991. Long-range Finnis-Sinclair potentials for fcc metallic alloys. Philos. Mag. Lett. 63, 217-224]. In this paper,...

Well Placement optimization using hybrid optimization technique combined with fuzzy inference system

, Article Petroleum Science and Technology ; Vol. 31, issue. 5 , Dec , 2009 , p. 481-491 ; ISSN: 10916466 Darabi, H ; Masihi, M ; Sharif University of Technology

2009

Abstract

Decision on the location of new wells through infill drilling projects is a complex problem that depends on the reservoir rock and fluid properties, well and surface facilities specifications, and economic measures. Conventional approach to address this is a direct optimization that uses the numerical flow simulation. However, this is computationally very extensive. In this study the authors use a hybrid genetic algorithm (HGA) optimization technique based on the genetic algorithm (GA) with helper functions based on the polytope algorithm and the neural network. This hybridization introduces hill-climbing into the stochastic search and makes use of proxies created and calibrated iteratively...

Well Placement optimization using hybrid optimization technique combined with fuzzy inference system

, Article Petroleum Science and Technology ; Volume 31, Issue 5 , 2013 , Pages 481-491 ; 10916466 (ISSN) Darabi, H ; Masihi, M ; Sharif University of Technology

2013

Abstract

Decision on the location of new wells through infill drilling projects is a complex problem that depends on the reservoir rock and fluid properties, well and surface facilities specifications, and economic measures. Conventional approach to address this is a direct optimization that uses the numerical flow simulation. However, this is computationally very extensive. In this study the authors use a hybrid genetic algorithm (HGA) optimization technique based on the genetic algorithm (GA) with helper functions based on the polytope algorithm and the neural network. This hybridization introduces hill-climbing into the stochastic search and makes use of proxies created and calibrated iteratively...

Illuminating the formal–informal dichotomy in land development on the basis of transaction cost theory

, Article Planning Theory ; 2018 ; 14730952 (ISSN) Darabi, H ; Jalali, D ; Sharif University of Technology

SAGE Publications Ltd 2018

Abstract

Transaction cost theory is largely used to investigate the formal domain of land and housing. In the informal domain, however, this perspective has been employed largely as a supplement in addressing the other fundamental notion in new institutional economics—property rights—despite the possibility that informality in land development can emerge regardless of the informality or formality of such rights. To cover this gap, this study developed a theoretical framework based on transaction cost theory to explain the formal–informal dichotomy in land development. The proposed framework maintains that land development depends on engaging in transactions that involve total or partial ownership of...

Coupled rotational and translational modeling of two satellites connected by a tether and their robust attitude control using optimal offset approach

, Article Advances in Space Research ; Volume 63, Issue 8 , 2019 , Pages 2455-2468 ; 02731177 (ISSN) Darabi, A ; Assadian, N ; Sharif University of Technology

Elsevier Ltd 2019

Abstract

In this study, the robust sliding mode attitude control of a tethered satellite system using optimal tether offset in the presence of perturbations and uncertainties is investigated. The three main goals of this study are: (1) comprehensive modeling of two satellites connected by a tether considering the coupling between their attitude and position, (2) finding a robust attitude control for both satellites, and (3) reducing the reaction wheels’ power consumption for attitude control utilizing the tether tension. In this regard, the 6 DOF governing equations of the coupled nonlinear rotational and translational dynamics of a two-satellite tethered system in the presence of perturbing forces...

Illuminating the formal–informal dichotomy in land development on the basis of transaction cost theory

, Article Planning Theory ; Volume 18, Issue 1 , 2019 , Pages 100-121 ; 14730952 (ISSN) Darabi, H ; Jalali, D ; Sharif University of Technology

SAGE Publications Ltd 2019

Abstract

Transaction cost theory is largely used to investigate the formal domain of land and housing. In the informal domain, however, this perspective has been employed largely as a supplement in addressing the other fundamental notion in new institutional economics—property rights—despite the possibility that informality in land development can emerge regardless of the informality or formality of such rights. To cover this gap, this study developed a theoretical framework based on transaction cost theory to explain the formal–informal dichotomy in land development. The proposed framework maintains that land development depends on engaging in transactions that involve total or partial ownership of...

A Cloud Based Architecture Design for Global Supply Chain

, M.Sc. Thesis Sharif University of Technology Darabi, Zahra (Author) ; Houshmand, Mahmoud (Supervisor)

Abstract

Supply chain as one of the most important and critical parts of the production process; could have significant effect on efficiency and productivity of the firms.Integration of supply chain (components from upstream to downstream of production system) has been recently noticed and considered remarkably since it could have a considerable impact on functional variables in supply chain systems such as: cost reduction, responsiveness, service level and decision making process. On the one hand, in the last decade, new trends in global economics and the ongoing pattern in multinationals to outsource their manufacturing process have made the integration process challenging and difficult. On the...

, M.Sc. Thesis Sharif University of Technology Darabi, Meisam (Author) ; Rashtchian, Davood (Supervisor)

Abstract

Emergency Shut Down systems are considered as one of the prominent protection layers in industries. In the situation that the process variables exist acceptable limits, the SIS brings the process in a safe state. According to standards, separate design and operation have been defined for BPCS and SIS. In this research, safety issues related to one of the gas refinery unit has been investigated. In fact, the unit does not have shut down system and all the safety loops are defined as DCS. In the first step, the Safety Integrated Levels of the loops which must be defined in shut down system have been specified by using Modified Calibrated Risk Graf. In next step, philosophy of shut down levels...

Parallel Multi-disciplinary Design Optimization of a Guided Flying Vehicle

, M.Sc. Thesis Sharif University of Technology Darabi, Davoud (Author) ; Nobahari, Hadi (Supervisor)

Abstract

Multi-disciplinary design optimization (MDO) of a surface to air flying vehicle has been done in this research, on the basis of flight simulation. The MDO problem have five disciplines consists of aerodynamic, propulsion, guidance, control, and fire control. Multiple campaign scenarios are defined. The MDO problem has 31 design variables and two objective functions. The objective functions are flying vehicle weight and miss distance. A new meta-heuristic algorithm has been designed to solve multi-objective optimization problems. The new algorithm has been called Multi-objective Adaptive Real-coded Memetic Algorithm (MARCOMA). The MARCOMA can solve large-scale and multi-objective problems and...

Coupled Rotational and Translational Modelling of Two Satellite Tethered Formation and their Robust Attitude Control

, M.Sc. Thesis Sharif University of Technology Darabi, Atefe (Author) ; Assadian, Nima (Supervisor)

Abstract

The 6DOF modelling and robust attitude control of two tethered satellites using tether tension moments is studied in this thesis. In this regard, the coupled rotational and translational dynamics of two satellites connected by a tether in the presence of Earth’s gravitational perturbation, aerodynamic drag, solar radiation pressure and third body effects (Sun and Moon) and also uncertainties in some of physical parameters of system and sensor’s outputs is modelled. Moreover, the tether attachment point to the satellites is different from their center of mass and its effect on dynamics of the system is taken into consideration. Then, the attitude of both satellites are controlled using robust...

Machine Learning for Optimizing Drug Dosing in Anti-Angiogenic Cancer Therapy

, M.Sc. Thesis Sharif University of Technology Darabi, Atyeh (Author) ; Moghadasi, Reza (Supervisor)

Abstract

Optimal drug dosing is one of the fundamental challenges in treating complex diseases such as cancer. Cancer, characterized by the rapid growth of tumors and the stimulation of angiogenesis to form new blood vessels for providing nutrients and oxygen, is one of the most significant public health threats. Angiogenesis is influenced by factors that guide the migration and aggregation of endothelial cells toward the tumor. In this study, the Anderson-Chaplain mathematical model was utilized to simulate the dynamics of angiogenesis and analyze the effects of relevant biological parameters.To better understand this process, topological data analysis and clustering methods were applied to the...

NURA: A framework for supporting non-uniform resource accesses in GPUs

, Article 2022 ACM SIGMETRICS/IFIP PERFORMANCE Joint International Conference on Measurement and Modeling of Computer Systems, SIGMETRICS/PERFORMANCE 2022, 6 June 2022 through 10 June 2022 ; 2022 , Pages 39-40 ; 9781450391412 (ISBN) Darabi, S ; Mahani, N ; Baxishi, H ; Yousefzadeh, E ; Sadrosadati, M ; Sarbazi Azad, H ; ACM SIGMETRICS ; Sharif University of Technology

Association for Computing Machinery, Inc 2022

Abstract

Multi-application execution in Graphics Processing Units (GPUs), a promising way to utilize GPU resources, is still challenging. Some pieces of prior work (e.g. spatial multitasking) have limited opportunity to improve resource utilization, while others, e.g. simultaneous multi-kernel, provide fine-grained resource sharing at the price of unfair execution. This paper proposes a new multi-application paradigm for GPUs, called NURA, that provides high potential to improve resource utilization and ensure fairness and Quality-of-Service(QoS). The key idea is that each streaming multiprocessor (SM) executes the Cooperative Thread Arrays (CTAs) that belong to only one application (similar to...

NURA: A framework for supporting non-uniform resource accesses in gpus

, Article Proceedings of the ACM on Measurement and Analysis of Computing Systems ; Volume 6, Issue 1 , 2022 ; 24761249 (ISSN) Darabi, S ; Mahani, N ; Baxishi, H ; Yousefzadeh Asl Miandoab, E ; Sadrosadati, M ; Sarbazi Azad, H ; Sharif University of Technology

Association for Computing Machinery 2022

Abstract

Multi-application execution in Graphics Processing Units (GPUs), a promising way to utilize GPU resources, is still challenging. Some pieces of prior work (e.g., spatial multitasking) have limited opportunity to improve resource utilization, while other works, e.g., simultaneous multi-kernel, provide fine-grained resource sharing at the price of unfair execution. This paper proposes a new multi-application paradigm for GPUs, called NURA, that provides high potential to improve resource utilization and ensures fairness and Quality-of-Service (QoS). The key idea is that each streaming multiprocessor (SM) executes Cooperative Thread Arrays (CTAs) belong to only one application (similar to the...

An intelligent multi-agent system architecture for enhancing self-management of type 2 diabetic patients

, Article IEEE Conference on Computational Intelligence in Bioinformatics and Computational Biology, CIBCB 2015, 12 August 2015 through 15 August 2015 ; August , 2015 , Page(s): 1 - 8 ; 9781479969265 (ISBN) Darabi, Z ; Zarandi, M. H. F ; Solgi, S. S ; Turksen, I. B ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2015

Abstract

This paper presents a multi agent system which can help type 2 diabetic patients. Because of diabetes nature, medical care and lifestyle can both prevent the complications of this illness, so self-managing is very crucial for these patients. Therefore, each effective factor of controlling diabetes and increasing patients' knowledge including: suitable diet and monitoring blood glucose level, is assigned to be an agent which works independently whilst coordinates and cooperates with other agents. The proposed architecture of this multi agent system organizes all the various agents of this system in a way that not only each of them can accomplish their responsibility, but also they can have...

Performance Modeling Of Twin Shaft Gas Turbine as a Turbocomperessor

, M.Sc. Thesis Sharif University of Technology Mohajer Darabi, Abbas (Author) ; Ghorbanian, Kaveh (Supervisor)

Abstract

Gas turbines and centrifugal compressors are the preferred means of compressing the gas in pipeline systems. Both gas turbines and centrifugal compressors exhibit performance characteristics that depend on the operating point imposed on them by the pipeline operation. Simulation of gas turbine-driven centrifugal compressors is necessary for a variety of applications in the general area of pipeline simulation. This research focuses on modeling of twin shaft gas turbine dynamic and steady state performance. For this purpose, it was necessary to evaluate the thermodynamic working process of the gas turbine by using an in-house computer code. At design point, the calculations are solely based on...

Performance evaluation of custom power devices in process of motor bus transfer

, Article 2009 4th IEEE Conference on Industrial Electronics and Applications, ICIEA 2009, Xi'an, 25 May 2009 through 27 May 2009 ; 2009 , Pages 2279-2284 ; 9781424428007 (ISBN) Janaghaei, M ; Abedi, M ; Darabi, F ; Sharif University of Technology

2009

Abstract

Quality and continuity of electrical power to sensitive loads especially in power plants and industrial sectors is of great importance. For this reason, bus transfer is used. During the bus transfer interval, sensitive loads especially motors will be interrupted, and may encounter difficulties. So, it is used reactive power compensator and custom power devices to mitigate stress in motors and improve power quality indices. This paper presents the effect of reactive power compensator and custom power devices paralleling with motor in process of bus transfer which is done in two methods: EMTS and STS. Also, it is investigated dynamic performance of induction motor and spin-down curves in...

Optical modulation by surface states

, Article Semiconductor Science and Technology ; Volume 18, Issue 1 , 2003 , Pages 60-67 ; 02681242 (ISSN) Darabi, E ; Khorasani, S ; Rashidian, B ; Sharif University of Technology

2003

Abstract

In this paper, the effect of two-dimensional electron plasma formed on the surface of a semiconductor on the refraction phase of an optical beam is investigated. Both the density and effective mass of the surface state electrons can be controlled by a transverse electric field. While the surface density of electrons varies slowly with the applied field, their effective mass changes instantaneously. Therefore, a high bandwidth for the phase modulation can be obtained. It is expected that the device operates in the far-infrared region with a semiconductor as the base material. GaAs is one of the best candidates having both large dynamic range, and large ratio of free electron to the crystal...