Loading...
Search for:
energy-consumption
0.012 seconds
Total 263 records
Evaluating the Energy Consumption of Fault-Tolerance Mechanisms In Processors Implemented on Sram-Based Fpgas
, M.Sc. Thesis Sharif University of Technology ; Ejlali, Alireza (Supervisor)
Abstract
With growing interest in the use of SRAM-based FPGAs in space and other radiation environments, there is a greater need for efficient and effective fault-tolerant design techniques specific to FPGAs. The soft errors vulnerability of SRAM-based FPGAs limits their usage in safety-critical applications. Moreover, the rate of multiple soft errors increases due to the feature size reduction. Hence, this issue becomes a challenge against reliability of the implemented circuit on SRAM-based FPGAs. Appealing to specifics such as low cost and re-configurability in SRAM based FPGAs provide this ability to change implemented design remotely. This advantage is not negligible in safety critical...
Reduction of Energy Consumption in Wireless Sensor Networks Using Genetic Algorithm
, M.Sc. Thesis Sharif University of Technology ; Hemmatyar, Ali Mohammad Afshin (Supervisor)
Abstract
Reducing energy consumption is one of the challenges facing wireless sensor networks with many solutions introduced for them with each having advantages and disadvantages. Some of the solutions introduced are based on using movable sinks. In this project, we attempt at proposing a place for the establishment of sinks using genetic algorithm that can reduce energy consumption in the net knots and increase the net life. This work should be done after reviewing the results of past researches and introduced methods. We will analyze the practicality of the proposed model using simulation and will show their advantages over the previous mentioned methods
Energy Efficient Policies for TDMA based Wireless Body Area Network (WBAN)
, M.Sc. Thesis Sharif University of Technology ; Nasiri-Kenari, Masoumeh (Supervisor) ; Ashtiani, Farid (Supervisor)
Abstract
Recent advancements in wireless communication along with the urgent need for new care systems for the patients, has attracted the attention of many communication researchers to Wireless Body Area Networks (WBANs), which has led to IEEE 802.15.6 and IEEE 802.15.4j standards, accordingly. The main goal of such networks, is to send the vital data of the associate, through the over/in-body-implanted sensors, to one central node. One of the key features of these networks is the limited energy sources of the sensors, transmit the data. Meanwhile, on-time error-free transmission of the data is also of great importance. Therefore, designing a proper algorithm, satisfying the aforementioned...
Design and Implementation of a FES-Assisted Control for a Lower Limb Hybrid Exoskeleton Robot in order to Reduce the Robot Energy Consumption
, M.Sc. Thesis Sharif University of Technology ; Vosoughi, Gholamreza (Supervisor) ; Moradi, Hamed (Supervisor)
Abstract
Wearable robots, or exoskeletons, are electromechanical devices that aim to assist user by supplying additional mechanical power as needed. The interaction of these robots with humans and the possibility of robots using their various abilities such as intelligence, control power, sensors, etc., make one of the crucial components of these control algorithms, its interaction and integration with the user. In this regard, functional electrical stimulation is one way to use human abilities to control the robot and achieve broader goals. Adding functional electrical stimulation to a wearable robot creates an emerging group of robots called hybrid exoskeletons. Hybrid exoskeletons provide the...
An RT-Level Low Power Design Technique for Digital Circuits Implemented on FPGAs
, M.Sc. Thesis Sharif University of Technology ; Ejlali, Alireza (Supervisor)
Abstract
RT-level techniques are one of the most important categories of techniques employed for decreasing power consumption in digital systems. These techniques are usually applied in the HDL description of the system, however some of them are applicable automatically by the synthesis tools. Some of the most commonly used RT-level techniques include Operand isolation, Clock gating, Concurrency & Redundancy, Pre-computation and Pipeline for low power. However these techniques have been mostly employed in ASIC designs, and FPGAs have scarcely been addressed. Application of these techniques on FPGAs might need special considerations, since resources on FPGAs are inherently different than their ASIC...
Thermal-aware Accelerator Placement and Task Assignment for Energy Improvement in Data Center
, M.Sc. Thesis Sharif University of Technology ; Goudarzi, Maziar (Supervisor)
Abstract
With the proliferation of data centers, their ever-growing energy consumption has gained lots of attention from both academy and industry . Two primary parts that use majority of energy in data centers are IT equipment and cooling system or Computing Room Air Conditioning (CRAC) unit. Energy consumption of cooling system strongly relies on thermal performance of data center. Therefore, applying thermal management techniques for decreasing energy consumption of CRAC is a common practice. Moreover, the energy consumption of IT equipment affects the energy consumption of CRAC directly. Demand for more computing resources in data centers and their physical limits has, motivated the use of FPGAs ...
Heat and Cooling Load Management through Minimizing the Heat Transfer and Utilizing the Storage Potential of Materials and Equipment Inside a Building
, M.Sc. Thesis Sharif University of Technology ; Saboohi, Yadollah (Supervisor)
Abstract
Buildings are responsible for 40% of total energy consumption worldwide. A significant portion of this energy contributes to building temperature control, and energy storage is an effective way to reduce energy consumption and to levelize the supply of heat load. A solution for reducing energy consumption in the building is to increase the thermal inertia of the building and to store energy using smart materials in the building components. Materials with phase change can stabilize the internal temperature of the building.In the present study, model is exmined with the help of modeling the thermal behavior of a room in Tehran in summer, using MATLAB software. The problem is solved by the...
An Adaptive and Energy Aware Data Allocation for Scratchpad Memory in Energy Harvesting Systems with Non-volatile Memory
, M.Sc. Thesis Sharif University of Technology ; Ejlali, Alireza (Supervisor)
Abstract
Energy consumption is considered as one of the key constraints in the design of Embedded Systems. Exploiting abundant ambient energy offers a practical solution for designing embedded systems. In this regard, emerging trends are surging towards replacing battery-powered embedded systems in various different applications such as wearable systems, Internet of Things, and pervasive computing. Also, with the development and ommercialization of emerging Non-volatile memory technologies,the potential to reduce the static energy consumption and the ability to retain data in the absence of input energy, has become practically feasible for Embedded Systems. Consequently, recent researches have...
Energy Efficient Policies for Random Access Wireless body Area Networks
, M.Sc. Thesis Sharif University of Technology ; Nasiri Kenari, Masoumeh (Supervisor) ; Ashtiani, Farid (Supervisor)
Abstract
Wireless Body Area Networks(WBAN) consist of some sensor nodes placed in or inside the body and reportmedical data to a central node. The most important application of WBANs will be in medicine for monitoring of patients. In this applicationthe battery not only occupies a significant volume in the node but also itcan’t be changed easily,specially in implanted nodes case. On the other handas WBAN is used to report vital information, it should be reliable. Hence, the most important issues in WBAN design are both energy constraint and reliability requirement. Most of works in the literature, utilize Time Division Multiple Access (TDMA) with a central node to dynamically control the transmission...
Deep Reinforcement Learning for Building Climate Control Using Weather Forecast Data
, M.Sc. Thesis Sharif University of Technology ; Rezaeizadeh, Amin (Supervisor)
Abstract
Buildings account for more than 30% of the world’s total energy consumption. Among building end-uses, air conditioning and in particular cooling systems have a major share of more than 50%. Therefore, design of optimal controllers for AC systems has become increasingly important. Classical and model-free control methods typically lack the ability to optimize energy consumption. On the other hand, model-based optimal control methods rely on precise modeling, which is difficult to acquire due to the complexity of the AC system dynamics.In recent years, deep reinforcement learning has become a popular choice for optimal control of systems with complex dynamics. In this thesis, a deep...
Design of Condensing Heat Exchangers for Recovery of Heat and Water from Flameless Combustion Flue Gas
, M.Sc. Thesis Sharif University of Technology ; Saboohi, Yadollah (Supervisor)
Abstract
The exit flue gas temperature of conventional gas fired boiler is generally high and considerable energy is lost to environment. Therefore, new methods are needed to recover water and heat from boiler flue gas in order to reduce overall plant water consumption as well as to increase energy efficiency and mitigate detrimental emissions. This project involved design of a heat and water recovery system including condensing heat exchangers to be used in residential buildings. In this project based on simulation of heat and water recovery system the recoverable amount of heat and efficiency improvement potential at various conditions such as different exit flue gas temperatures and different...
Analysis of Operational Indices for Old National Thermal Powerplants for Performance Optimization and Consumption Management in Operational Conditions
, M.Sc. Thesis Sharif University of Technology ; Mazaheri, Karim (Supervisor)
Abstract
In recent years, the country's electricity industry has faced many problems. On the one hand, the number of consumers and the intensity of their consumption have increased, and on the other hand, the production sector has been facing many problems. Since the management of these systems requires the development of mathematical models, the introduction of various operational indices and system analysis, in order to provide solutions to reduce consumption, increase production and reduce environmental damage, in this research Bistoon Kermanshah steam power plant, as a selected power plant, is simulated in both design and operational conditions, by the information available in the design...
Solving Electric Vehicle Traffic Assignment Problem Considering Time-Dependent Energy Consumption
, M.Sc. Thesis Sharif University of Technology ; Zokaei Ashtiani, Hedayat (Supervisor)
Abstract
Battery Electric vehicles (BEVs) are turning into a more well known type of transportation because of their energy effectiveness, further sustainability, and the arrangement of government support through motivation programs. However, BEVs have a constrained driving range due to their limited battery capacity. This limited battery capacity leads to a fear of exhausting energy in the middle of route which is referred to as range anxiety. The range anxiety affects BEV users’ travel choices such as route choice. Hence, BEV users should consider their vehicles’ remaining range while trying to minimize their travel times. This concern consequently changes the equilibrium flow on the transportation...
Optimizing Energy Consumption in Electric Arc Furnace
, M.Sc. Thesis Sharif University of Technology ; Saboohi, Yadollah (Supervisor) ; Kazemzadeh Hannani, Siamak (Supervisor)
Abstract
Electric Arc Furnaces" are of the most important industries in energy field. High energy consumption leads us to improve model for optimizing energy demand in electric arc furnaces. Melting and refining are two processes which need high amounts of energy. There are several different energy resources in electric arc furnaces. Materials can receive energy from electric arc or from chemical reactions that takes place between molten steel and slag. In addition, some slag formers should be added to the furnace. There are complicated relations between mass transfers, heat transfer and energy balance in EAF. In order to solve energy conservation problem in EAF, we should first extract equations to...
Application Communication-aware Data Center Energy Optimization
, M.Sc. Thesis Sharif University of Technology ; Goudarzi, Maziar (Supervisor)
Abstract
Virtualization has provided good and efficient use of resources in today datacenters. In this environment, modules of multi-tier applications can run on several Virtual Machines (VMs). VMs that are dedicated to a module often need to transfer data among themselves, and also to the VMs in other modules, and hence, the overall application runtime may be increased if the communicating VMs are put on far physical machines; consequently, servers must be up for a longer time and will consume more energy. Consolidating several VMs on a single Physical Machine (PM) effectively reduces the total computing power consumption, but we show that it is also important to consider the above inter-VM...
Using Automata-based techniques for Energy Management in Embedded Systems
, M.Sc. Thesis Sharif University of Technology ; Ejlali, Ali Reza (Supervisor)
Abstract
These days, societies prefer to use systemsthat provide more utilities with rapid processing. This lead to make large volume of information to process.And also, the number of processors used in embedded systems is more than the number of them in PC. Gradually, the embedded systems own complex processor. On the other hand, according to the Moore’s law, the number of transistors on a chip doubles every eighteen months. That lead to be more complex. And also, based on predictions, the amount of software used in most of electronic devices doubles every two years.The increasing of amount of information and high-performance expecting havecaused increaseprocessing. The increasing requires more...
Analysis of Personal Factors in Determination of Thermal Comfort Zone at University
, M.Sc. Thesis Sharif University of Technology ; Rajabi Ghahnavieh, Abbas (Supervisor)
Abstract
Due to the energy crisis in recent years, much of which is due to excessive energy consumption in the air conditioning of buildings, many studies have been conducted from the perspective of engineering sciences on the subject of insulation and optimization of buildings. This study aims to investigate the conditions of thermal comfort from the mental and psychological perspective of human beings, which is the basis of the individual's decision to accept thermal adaptation behavior in the standard temperature range. In this study, the thermal adaptation model was designed on the theory of programmed behavior, which can explain the adaptation of individuals to the comfort temperature region....
Evaluating Data Prefetching Methods and Proposing an Energy-aware First Level Cache for Cloud Workloads
, Ph.D. Dissertation Sharif University of Technology ; Sarbazi Azad, Hamid (Supervisor)
Abstract
Data generation rate is far more than the technology scaling rate in a way that there will be a 40x gap between the data generation rate and the technology scaling rate in 2020. On one hand, unlike traditional HPC clusters, processors in data centers are not fully utilized and on the other hand, unlike traditional embedded processors, they are not idle most of the time. Therefore, energy consumption of such processors is an important issue; otherwise dealing with a huge volume of data will be problematic in the near future. In this dissertation, we will show that while first level data cache encounters high miss rate, traditional approaches such as data prefetching, which were efficient for...
Energy Management Technique with the Consideration of Time-Utility Functions for Soft Real-Time Embedded Systems
, M.Sc. Thesis Sharif University of Technology ; Ejlali, Alireza (Supervisor)
Abstract
Temporary or permanent overload commonly occurs in soft real-time systems. In such situations,the scheduler cannot guarantee the completion of all tasks prior to their deadlines.Hence, some tasks are usually aborted before or during the execution with the aim of maximizing system utility. For this purpose, time-utility function (TUF) of tasks is used to determine how to maximize the accrual utility of the system. Tasks which can provide more utility are more preferable for execution. Previous works on utility accrual maximizing algorithms have not considered memory allocation in accruing utility of soft real time systems. In this thesis, we present an online scheme for multicore embedded...
Efficient Method for Data Aggregation for K-coverage in Wireless Sensor Networks
, M.Sc. Thesis Sharif University of Technology ; Hemmatyar, Ali Mohammad Afshin (Supervisor)
Abstract
Technology advances in the era of wireless communications leads to the birth of a very useful network called Wireless sensor Network which is very interesting for scientists and researchers. While these networks consist of tens to thousands of tiny sensor nodes, they consume their energy from none-rechargeable batteries. Reducing energy consumption and extend the life of network is the most challenging requirement for these kinds of networks; in some environments like military training which precision and sensitivity are critical, it might take at least K sensors to cover the whole area and these conditions leads to a vast data repetition in network and as a result energy exhaustions in...