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    A hybrid method for reduction of energy consumption in cloud networks

    , Article 18th CSI International Symposium on Computer Science and Software Engineering, CSSE 2017, 25 October 2017 through 27 October 2017 ; Volume 2018-January , 2018 , Pages 18-23 ; 9781538613023 (ISBN) Tarahomi, M ; Izadi, M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2018
    Abstract
    Cloud computing consists of physical data centers each of which including hundreds or thousands of computers. A key enabler technology is virtualization. The Virtualization allows us to separate virtual machines in a way that each of these so-called virtualized machines can be configured with a number of hosts according to the type of application of the user. It is also possible to dynamically alter the allocated resources of a virtual machine. One of the most important challenges in terms of cloud computing is to maintain an optimized load balance in cloud environment on servers because this issue is critical for energy consumption. In this paper, we propose a hybrid method for reduction of... 

    A prediction-based and power-aware virtual machine allocation algorithm in three-tier cloud data centers

    , Article International Journal of Communication Systems ; Volume 32, Issue 3 , 2019 ; 10745351 (ISSN) Tarahomi, M ; Izadi, M ; Sharif University of Technology
    John Wiley and Sons Ltd  2019
    Abstract
    With the increasing popularity of cloud computing services, the more number of cloud data centers are constructed over the globe. This makes the power consumption of cloud data center elements as a big challenge. Hereby, several software and hardware approaches have been proposed to handle this issue. However, this problem has not been optimally solved yet. In this paper, we propose an online cloud resource management with live migration of virtual machines (VMs) to reduce power consumption. To do so, a prediction-based and power-aware virtual machine allocation algorithm is proposed. Also, we present a three-tier framework for energy-efficient resource management in cloud data centers.... 

    A hybrid algorithm to reduce energy consumption management in cloud data centers

    , Article International Journal of Electrical and Computer Engineering ; Volume 9, Issue 1 , 2019 , Pages 554-561 ; 20888708 (ISSN) Tarahomi, M ; Izadi, M ; Sharif University of Technology
    Institute of Advanced Engineering and Science  2019
    Abstract
    There are several physical data centers in cloud environment with hundreds or thousands of computers. Virtualization is the key technology to make cloud computing feasible. It separates virtual machines in a way that each of these so-called virtualized machines can be configured on a number of hosts according to the type of user application. It is also possible to dynamically alter the allocated resources of a virtual machine. Different methods of energy saving in data centers can be divided into three general categories: 1) methods based on load balancing of resources; 2) using hardware facilities for scheduling; 3) considering thermal characteristics of the environment. This paper focuses... 

    Energy efficiency in virtual machines allocation for cloud data centers with lottery algorithm

    , Article International Journal of Electrical and Computer Engineering ; Volume 9, Issue 1 , 2019 , Pages 546-553 ; 20888708 (ISSN) Tarahomi, M ; Izadi, M ; Sharif University of Technology
    Institute of Advanced Engineering and Science  2019
    Abstract
    Energy usage of data centers is a challenging and complex issue because computing applications and data are growing so quickly that increasingly larger servers and disks are needed to process them fast enough within the required time period. In the past few years, many approaches to virtual machine placement have been proposed. This study proposes a new approach for virtual machine allocation to physical hosts. Either minimizes the physical hosts and avoids the SLA violation. The proposed method in comparison to the other algorithms achieves better results. Copyright © 2019 Institute of Advanced Engineering and Science. All rights reserved  

    New approach for reducing energy consumption and load balancing in data centers of cloud computing

    , Article Journal of Intelligent and Fuzzy Systems ; Volume 37, Issue 5 , 2019 , Pages 6443-6455 ; 10641246 (ISSN) Tarahomi, M ; Izadi, M ; Sharif University of Technology
    IOS Press  2019
    Abstract
    Cloud computing is a new framework, which is facing a numerous type of challenges including resource management and energy consumption of data centers. One of the most important duties of cloud service providers is to manage resources and schedule tasks for reducing energy consumption in data centers. In this paper, fuzzy logic is used for finding most adequate DC, improved DVFS algorithm is used for selecting ideal host and developed version of EDF-VD algorithm is utilized for Task scheduling and load balance in cloud computing. Our approach improvement to the current methods including EEVS, DVFS, Homogeneous, MBFD and EEVS-N. © 2019-IOS Press and the authors. All rights reserved  

    New approach for reducing energy consumption and load balancing in data centers of cloud computing

    , Article Journal of Intelligent and Fuzzy Systems ; Volume 37, Issue 5 , 2019 , Pages 6443-6455 ; 10641246 (ISSN) Tarahomi, M ; Izadi, M ; Sharif University of Technology
    IOS Press  2019
    Abstract
    Cloud computing is a new framework, which is facing a numerous type of challenges including resource management and energy consumption of data centers. One of the most important duties of cloud service providers is to manage resources and schedule tasks for reducing energy consumption in data centers. In this paper, fuzzy logic is used for finding most adequate DC, improved DVFS algorithm is used for selecting ideal host and developed version of EDF-VD algorithm is utilized for Task scheduling and load balance in cloud computing. Our approach improvement to the current methods including EEVS, DVFS, Homogeneous, MBFD and EEVS-N. © 2019-IOS Press and the authors. All rights reserved  

    A Hybrid Method Based on Scheduling and Load Balancing to Reduce the Power Consumption in Cloud Networks

    , Ph.D. Dissertation Sharif University of Technology Tarahomi, Mehran (Author) ; Izadi, Mohammad (Supervisor)
    Abstract
    In recent years, cloud computing has provided a well-known platform to provide on-the-fly and cost-efficient services on local and world area networks. As a result, the number of cloud data centers is increasing due to the increasing number of customers. For this reason, the energy consumption of numerous cloud data centers is one of the biggest bottlenecks for cloud providers. In general, various hardware and software-based solutions can be used to optimize power consumption at the same time of guaranty service level agreements. One of the most popular of these software-based solutions is dynamic allocation of resources to virtual machines (VM), i.e. a sandboxing technique responsible for... 

    An efficient power-aware VM allocation mechanism in cloud data centers: a micro genetic-based approach

    , Article Cluster Computing ; 2020 Tarahomi, M ; Izadi, M ; Ghobaei Arani, M ; Sharif University of Technology
    Springer  2020
    Abstract
    Efficiency in cloud servers’ power consumption is of paramount importance. Power efficiency makes the reduction in greenhouse gases establishing the concept of green computing. One of the beneficial ways is to apply power-aware methods to decide where to allocate virtual machines (VMs) in data center physical resources. Virtualization is utilized as a promising technology for power-aware VM allocation methods. Since the VM allocation is an NP-complete problem, we use of evolutionary algorithms to solve it. This paper presents an effective micro-genetic algorithm in order to choose suitable destinations between physical hosts for VMs. Our evaluations in simulation environment show that... 

    Modeling Propagation of Cardiac Action Potential at Cellular Level

    , M.Sc. Thesis Sharif University of Technology Farahani, Mojtaba (Author) ; Jahed, Mehran (Supervisor)
    Abstract
    Heartbeat is the result of contractions of over 10 billion cardiac cells. These cells’ cytoplasms are connected to each other by gap junctions which are arrays of intercellular protein channels. Thus action potential can propagate from one cell to another and cause its contraction. In core-conductor model, one-dimensional microscopic representation of cardiac tissue, cells are attached to each other to form a ladder network. The parallel elements are connected to each other by series resistors which represent gap junctions. These resistors are nearly always considered as static elements. In this thesis I have investigated the effects of incorporating the dynamicity of gap junction resistors... 

    Distributed Cardiovascular System Modeling

    , M.Sc. Thesis Sharif University of Technology Khani, Mehrdad (Author) ; Jahed, Mehran (Supervisor)
    Abstract
    Simulation of cardiovascular system functionality during various physiological conditions is essential at different diagnostic and clinical levels. A first step in studying the roots of cardiovascular diseases and abnormal activity is to study a practical yet complete model of the cardiovascular system. In this thesis we introduced a new approach for defining the distributed model of the cardiovascular system. Initially, we chose an appropriate subsystem, namely Arch of Aorta, and proposed a distributed model for it. The elements of the proposed model were nonlinear RLC elements that simulate resistance, blood viscosity and vessel elasticity respectively. To minimize the system complexity,... 

    Risk Breakdown Structure (RBS) Identification and Designing for projects

    , M.Sc. Thesis Sharif University of Technology Abdi, Mehdi (Author) ; Sepehri, Mehran (Supervisor)
    Abstract
    To actualize and making the outputs of a project effectual, it is necessary to conduct an effective management during a project. This case may not be possible without accurately planning for activities, management and controlling all phases of a project ignoring the risk management of that project. If risks of a project cannot be detected before conducting a project, it is possible to challenge the performance and even effectiveness of the project. In current conditions, the most important problem of managers and executives of construction projects through the country is risk management of projects, not acknowledging with definitions of risk, models of risk management and lack of a model for... 

    Introducing a suitable Controller for Rowing Activity in Patients with Spinal CordInjuries using FES

    , M.Sc. Thesis Sharif University of Technology Zarei, Mohammad (Author) ; Jahed, Mehran (Supervisor)
    Abstract
    Disconnections in neural paths from the central nervous system to the muscles or vice versa cause different neuropathies, thus paralysis in different limbs may occur. As a result of the lack of muscular activity and the decrease in blood perfusion in paralyzed limbs, problems like osteoporosis, increase in the risk of breaking, decline in muscle size, cardiovascular diseases, renal dysfunction, bedsores, etc may happen. In order to induce movement in paralyzed limbs, thus preventingmentioned problems, rowing exercise through Functional Electrical Stimulation (FES) may be utilized. In FES, electrical Stimulation using current stimulating pulses is applied to contracting and relaxing muscles,... 

    Performance Management of HSE Management System based on BSC Framework-the Case Study of Mapna Corporation

    , M.Sc. Thesis Sharif University of Technology Naseri, Amin (Author) ; Sepehri, Mehran (Supervisor)
    Abstract
    A Balanced Scorecard (BSC) model is proposed to evaluate performance of Health, Safety and Environment (HSE) management systems. This model includes key performance indicators at three integrated levels. It has been tested and verified in a project-based organization in Iran, active in the area of power and energy. Results show that the company has done well in implementing HSE management processes, but no so well in growth and learning. This model may be used as a basis for comparing different companies and various proposed programs in the field of HSE management systems. The model includes indicators and sub-indicators in each category particularly related to stakeholders, processes, and... 

    Functional Modeling of Normal and CHF Heart and Control of Total Artificial Heart- An Optimizing Approach

    , Ph.D. Dissertation Sharif University of Technology Ravanshadi, Samin (Author) ; Jahed, Mehran (Supervisor)
    Abstract
    World-wide, Congestive Heart Failure (CHF) takes hundreds of thousands of lives each year. This chronic heart disease causes poor performance of the heart and insufficient blood pumping to the organs. A significant percentage of patients with CHF require heart transplants for their survival. The high cost of heart transplant, shortage of donor hearts and possibility of its rejection by recipients are serious problems of this type of treatment. Therefore a large number of heart patients are potential beneficiaries of artificial blood pumps such as Ventricular Assist Device (VAD) and Total Artificial Heart (TAH). Performance of these systems must be compliant and complementary to the existing... 

    Identifying Affecting HR Factors on Unsuccessful Reengineering Projects

    , M.Sc. Thesis Sharif University of Technology Kordrostami, Melika (Author) ; Sepehri, Mehran (Supervisor)
    Abstract
    In this study, factors which lead in failures in reengineering processes in project based companies have been investigated. The research used qualitative methods, and finally using theme analysis to identify the main factors.Consequently, the main causes of failure of re-engineering projects have been identified and classified in six basic categories including: organizational leadership, planning, human resources management, mental models causing resistance, culture and organizational climate and communication. That each of these themes includes some subset of the agents it represents. In this study, a suitable pattern for organizations which intend to perform reengineering has been... 

    Applying Tandem CONWIP Policy to Assembly Supply Chain

    , M.Sc. Thesis Sharif University of Technology Shokoohyar, Sina (Author) ; Sepehri, Mehran (Supervisor)
    Abstract
    Supply chain management has been developed extensively in second half of last century and the development has been continued up to present century. Nowadays Development and conformity of production and inventory control methods with JIT philosophy in production line level is one of the topics that received much attention from researchers. An increasing interest in the scope of JIT philosophy is on the extension and adaptation of Pull policies such as Kanban and CONWIP for materials and production control. In a real-life environment, companies are subjected to various types of uncertainties such as stochastic processing times and variable demand. This uncertain environment could cause lots... 

    Joint Segmentation and Motion Estimation of Cardiac Cine MR Image Sequences

    , Ph.D. Dissertation Sharif University of Technology Eslami, Abouzar (Author) ; Jahed, Mehran (Supervisor)
    Abstract
    In this study a variational framework for joint segmentation and motion estimation is provided for inspecting heart in Cine MRI sequences. In the first work, a functional including Mumford-Shah segmentation and optical flow based dense motion estimation is proposed. However, the motion estimation technique is replaced with warping estimation in the second work to reach in more regular and smooth motion field based on tracking of cardiac boundaries. Both of these functionals are then approximated by using the phase-field method to make them suitable for extracting Euler-Lagrange equations. Numerical solution to the optimization problem, when the time and image spaces are discretized by finite... 

    Dynamics and Control of Needle Movement in Percutaneous Interaction with Prostate Tissue

    , Ph.D. Dissertation Sharif University of Technology Maghsoudi, Arash (Author) ; Jahed, Mehran (Supervisor)
    Abstract
    In many modern medical procedures, needle insertion is an inevitable part of the diagnosis or treatment protocols. The accuracy of the needle insertion is adversely affected by a number of factors. A needle, frequently assumed to be flexible, is inserted into a soft tissue and induces complex mechanical interactions that may result in considerable uncertainties. Tissue intrinsic characteristics as well as its deformation and rotation may cause dramatic complexities. This work considers the needle movement inside the tissue from the dynamics and control point of view. The proposed approach can be regarded as an initial step towards automation of needle insertion procedures; it can also be... 

    Needle Steering in Soft Tissue

    , M.Sc. Thesis Sharif University of Technology Haghighi, Payam (Author) ; Jahed, Mehran (Supervisor)
    Abstract
    Medical needle interventions are a common technique for accessing tissue structures.In these procedures, needles are used, for example, to extract biopsy samples, brachytherapy, and to insert drugs. In TRUS guided prostate brachytherapy application, Physicians used ulterasound imaging to steer the needle and insert radioactive seeds into cancerous tumors to irradiate surrounding tissue over several months. Prostate rotation, deformation, and unavailability of imaging data during part of the insertion path result in misplaced seeds. To overcome these problems, in this research, we modeled the prostate, its membrane and the surrounding fatty tissue as linearly elastic homogenous material, and... 

    Considering Lessons Learned and Ascertaining Their Roadmap in Project Management (Case Study: Sepanir Company)

    , M.Sc. Thesis Sharif University of Technology Aftabi, Meysam (Author) ; Sepehri, Mehran (Supervisor)
    Abstract
    Evolutions in the economy, society and politics has raised knowledge as a key element in the development and competitiveness and knowledge management is considered one of the essential elements in this field. By taking temporary nature of the project into account, dynamics and competition in the project-oriented organizations business world makes the preservation and management of knowledge in project-based organizations more important. Lesson learned system is one of the knowledge management tools that can propose strategic solutions which avoid wasting of time and money and make perfect use of knowledge management accomplishments.In this study, by using literature review, interview and...