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Improving Reliability of STT-MRAM Caches against Read Disturbance Errors
, M.Sc. Thesis Sharif University of Technology ; Miremadi, Ghasem (Supervisor)
Abstract
On-chip caches are regarded as a solution for increasing performance gap between main memory and CPU. In recent years, with the development in the performance of processing cores, the demands for larger on-chip caches are also increased. With the technology scaling trend, SRAM-based on-chip caches suffer from limited scalability, high leakage power consumption and vulnerability to soft errors. Among emerging non-volatile memories, STT-MRAMs are the most promising alternative for SRAMs in large last-level on-chip caches due to their higher density and near zero leakage power. However, the reliability of STT-MRAMs is threatened by soft and hard errors. Soft errors in STT-MRAMs can be...
REACT: Read/write error rate aware coding technique for emerging STT-MRAM caches
, Article IEEE Transactions on Magnetics ; Volume 55, Issue 5 , 2019 ; 00189464 (ISSN) ; Hosseini Monazzah, A. M ; Farbeh, H ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
Spin-transfer torque magnetic RAMs (STT-MRAMs) are the most promising alternative for static random-access memories in large last-level on-chip caches due to their higher density and near-zero leakage power. However, the reliability of STT-MRAMs is threatened by high probability of read disturbance and write failure. Both read disturbance and write failure, which cause a soft error in the cache cells, have an asymmetric behavior. Read disturbance occurs only in STT-MRAM cells storing '1' value, and write failure error rate in a → 1 transition is much higher than that in a 1 → 0 transition. In this paper, we propose Read/write Error-rate Aware Coding Technique (REACT) to improve the...
A-CACHE: alternating cache allocation to conduct higher endurance in nvm-based caches
, Article IEEE Transactions on Circuits and Systems II: Express Briefs ; 2018 ; 15497747 (ISSN) ; Hosseini Monazzah, A. M ; Aliagha, E ; Cheshmikhani, E ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
Recent developments in Non-Volatile Memories (NVMs) have introduced them as an alternative for SRAMs in on-chip caches. Besides the promising features of NVMs, e.g., near-zero leakage power, immunity to radiation-induced particle strike, and higher density, a major drawback of NVM-based caches is their short lifetime due to limited write endurance. This paper first reveals that in L1 caches, the lifetime of data-cache (D-cache) is about 472x shorter than that of instruction-cache (I-cache) due to extreme imbalance write stress between the two. Then, we propose a technique, so-called Alternating Cache Allocation to Conduct Higher Endurance (A-CACHE), to improve the lifetime of...
The Removal of CO2 from Flue Gas by Using MOF/Graphene Hybrid Adsorbents
, M.Sc. Thesis Sharif University of Technology ; Kazemeini, Mohammad (Supervisor) ; Ganji, Ensieh (Supervisor) ; Bozorgzadeh, Hamid Reza ($item.subfieldsMap.e)
Abstract
Due to the increase in greenhouse gases in earth’s atmosphere in recent years and its devastating environmental outcomes, there has been an increase in research trying to reduce these gases especially CO2. Flue gas is one of the most important sources of CO2 emission. Among the many techniques of removal, capturing and CO2 separation from flue gas, physical adsorption by a solid adsorbent is considered as a suitable and economic option. Among the solid adsorbent that are used for adsorption of CO2, Metal-Organic frameworks have many interesting features such as high specific surface area and high internal free volume. Among the Metal-Organic frameworks, MIL-53 (Al) and MIL-101 (Cr) are two...
Performance Evaluation and Investigation of Nano-Ceramic Membrane in order to Purification of Hydrogen in Laboratory Scale
, M.Sc. Thesis Sharif University of Technology ; Sayf Kordi, Ali Akbar (Supervisor) ; Zamanian, Akbar (Supervisor) ; Ganji Babakhani, Ensieh (Co-Advisor)
Abstract
Purification of hydrogen, as a clean source of energy has attracted great deal of attention in recent years. Among all available H2 separation methods, membrane technology has been known as the most appropriate way to produce hydrogen with high purity. In this study, we have tried to synthesis and evaluate the performance of perovskite ceramic membranes. The aim of preparing this type of membranes is to use them in separation processes in order to achieve H2 with high purity of >99%. First, general concepts about membranes are discussed. Then synthesis, recognition and performance evaluation of some perovskite membranes are presented. To prepare membranes, ceramic powders are synthesized by...