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2006 International Wireless Communications and Mobile Computing Conference, IWCMC 2006

作者： Matushima, Reinaldo Venturini, Yeda R. Sakuragui, Rony R. M. Carvalho, Tereza C. M. B. Ruggiero, Wilson V. Naslund, Mats Pourzandi, Makan Laboratory of Computer Architecture and Network PCS-EP University of São Paulo São Paulo Brazil Ericsson Research Stockholm Sweden Ericsson Research Open Systems Laboratory Mont-Royal Canada

ISBN: (纸本)1595933069

Mobility, usability and security are major requirements for any Ad Hoc network systems, and there have been numerous papers in regards to them. However, often these requirements are addressed separately. For a valid solution, these requirements must be considered from an integrated view. In this paper, taking into account mobility and usability, we implement a framework which allows to securely share resources and services between devices in Ad-hoc networks, based on security policies defined by the owners of those devices. In addition, we extend our framework to support inter-domain sharing of services and resources. We detail our design, present the preliminary results of our prototype, and discuss the lessons learned, in particular how user experience led to several re-designs of the initial security solution. Copyright 2006 ACM.

关键词： Ad hoc networks

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Geospatial exploration of geothermal reservoirs in the Souss Massa regions of the anti-atlas and Moroccan Sahara

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Materials Today: Proceedings 2022年 72卷 3911-3926页

作者： El Bouazouli, Abderrahim Baidder, Lahssen Bahi, Hicham Abdehamid, Fadil Rhouzlane, Said Moussaoui, Rabia Oukrich, Nadia Baite, Wissal Hlal, Mohammed Laboratory of Geosciences Faculty of Sciences Aïn Chock University Hassan II of Casablanca Morocco School of Architecture Planning and Design Mohammed VI Polytechnic University Benguerir Morocco Morocco Polytechnic School of Montreal Canada Laboratory of Industrial Equipe Architecture de Systems ENSEM Morocco research laboratory in computer science and education the mohammedia school of engineering Rabat Morocco Laboratory of Industrial Engineering Sciences and Technologies Faculty Sultan Moulay Slimane University Beni Mellal Morocco laboratory Dynamics of arid environments Mohamed Premier University Oujda Morocco

Geothermal reservoirs refer to any heat stored, naturally, in the earth's crust;it is considered as resource coming from a natural complex depending on the geological, geophysical aspect and territories geochemistry. Although this natural resource remains distinguished by his characters to be a renewable, ecological, universal and sustainable mining energy, it stills not, yet, sufficiently exploitable worldwide (El Bouazouli et al., 2020). The same finding was brought up in Moroccan context, despite the presence of some hot resources and capitalizable scientific research to develop this potential. Prospecting for underground geothermal resources is an expensive project that deserves to mobilize scientific and technical methods in order to overcome this risky impasse. Thus, Geomatics has been used, drawing on Remote Sensing for geo-spatial exploration in order to guide prospecting through the development of geothermal deposits potential maps at very low and medium depth on Moroccan territories (El Bouazouli et al., 2019). Furthermore, we explore smart tools to support short and long-term decision-making in terms of creating of clean energy mix and complementary mining energy as well as investment in energy exploration operations. And, as an experiment, we chose for this study, areas distributed mainly in the Moroccan Sahara and the Souss Massa Region, known, probably, by a potentially high geothermal gradient, and therefore constituting geothermal energy reservoirs. As for the exploration methodology adopted, it consists in processing of the imageries: LANDSAT 8, MODIS AND ASTER, in order to extract exploitation indices such as the surface temperature, the layer of lineaments and cracks density, and evidence of hydrothermal alteration that may indicate geothermal activity. The correlation between these three factors, will lead us to conclude that the Moroccan Sahara area is considered as one of the most potential geothermal reservoir areas in Morocco. In short, the a

关键词： Decision making

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An efficient storage technology for object-based distributed storage system

International Journal of Control and Automation

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International Journal of Control and Automation 2015年第11期8卷 337-348页

作者： Zhang, Jilin Su, Yucheng Wan, Jian Zhou, Li Wang, Jue Zhang, Lei College of Electrical Engineering Zhejiang University Hangzhou China School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China Key Laboratory of Complex Systems Modeling and Simulation Ministry of Education China Supercomputing Center of Computer Network Information Center Chinese Academy of Sciences Beijing China Computer Science Department Beijing University of Civil Engineering and Architecture Beijing China

There have two effective ways to improve the overall efficiency of the object-based distributed storage system, one is network caching technology and the other is metadata server cluster load balancing strategy. Under the heterogeneous storage environments, object-based distributed file system face the key challenge of lacking caching mechanism for the high-frequency access files, metadata server load imbalance also reduce the overall efficiency. To address these challenges, we discuss the design and implementation of an object-based distributed file storage caching system, and propose a weight-based metadata server cluster load balancing strategy. It effectively improve the metadata processing capacity. Based on the results, it demonstrated the feasibility and the efficiency of our methods. © 2015 SERSC.

关键词： Metadata

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Research and implementation of CDP disaster recovery system based on oracle

International Journal of Control and Automation

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International Journal of Control and Automation 2015年第11期8卷 325-336页

作者： Ren, Yongjian Ye, Jiaolong Zhang, Jilin Zhou, Li Wang, Jue Zhang, Lei School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China Key Laboratory of Complex Systems Modeling and Simulation Ministry of Education China College of Electrical Engineering Zhejiang University Hangzhou China Supercomputing Center of Computer Network Information Center Chinese Academy of Sciences Beijing China Computer Science Department Beijing University of Civil Engineering and Architecture Beijing China

The OraCDP disaster recovery system uses CDP disaster recovery technology based on the combination of block level, combining with the communication coupling between the underlying I/O and Oracle database. The experimental results show that the OraCDP system can not only maintain the normal operation of the original system without any negative influence, but also guarantee the recovery of data and service at specific time quickly, fully and accurately. © 2015 SERSC.

关键词： Recovery

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Couture: Tailoring STT-MRAM for persistent main memory 4

Couture: Tailoring STT-MRAM for persistent main memory

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4th Workshop on Interactions of NVM/Flash with Operating systems and Workloads, INFLOW 2016, co-located with OSDI 2016

作者： Shihab, Mustafa M. Zhang, Jie Gao, Shuwen Callenes-Sloan, Joseph Jung, Myoungsoo University of Texas Dallas United States Intel Corporation School of Integrated Technology Yonsei Institute Convergence Technology Yonsei University Computer Architecture Memory Systems Laboratory Korea Republic of

Modern computer systems rely extensively on dynamic random-access memory (DRAM) to bridge the performance gap between on-chip cache and secondary storage. However, continuous process scaling has exposed DRAM to high off-state leakage and excessive power consumption from frequent refresh operations. Spin-transfer torque magnetoresistive RAM (STT-MRAM) is a plausible replacement for DRAM, given its high endurance and near-zero leakage. However, conventional STT-MRAM cannot directly substitute DRAM due to its large cell space area and the high latency and energy costs for writes. In this work, we present Couture – a main memory design using tailored STT-MRAM that can offer a storage density comparable to DRAM and high performance with low-power consumption. In addition, we propose an intelligent data scrubbing method (iScrub) to ensure data integrity with minimum overhead. Our evaluation results show that, equipped with the iScrub policy, our proposed Couture can achieve up to 23% performance improvement, while consuming 18% less energy, on average, compared to a contemporary DRAM. © INFLOW 2016 - 4th Workshop on Interactions of NVM/Flash with Operating systems and Workloads, co-located with OSDI 2016. All rights reserved.

关键词： MRAM devices

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Protein structure superposition by curve moment invariants and iterative closest point

Protein structure superposition by curve moment invariants a...

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2007 1st International Conference on Bioinformatics and Biomedical Engineering, ICBBE

作者： Xu, Dong Li, Hua Gu, Tongjun Key Laboratory of Intelligent Information Processing Key Laboratory of Computer System and Architecture National Research Center for Intelligent Computing Systems Institute of Computing Technology Chinese Academy of Sciences Center for Systems Biology Institute of Biophysics Chinese Academy of Sciences Graduate University Chinese Academy of Sciences

ISBN: (纸本)1424411203

Superimpose one protein tertiary structure to another can help to find similarity between them and further identify functional and evolutionary relationships. We first extract invariant features under rigid body transformation for each protein backbone which is represented by alpha-carbons of all the residues. Then, the invariant features are embedded with Iterative Closest Point algorithm for superposition. With several initialized orientations, pairwise alignment can be achieved accurately only by few iterations. Experiments indicate that our proposed algorithm is competitive with several well-known algorithms and with smallest root mean squared distance. © 2007 IEEE.

关键词： Proteins

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ERrOR: Improving Performance and Fault Tolerance Using Early Execution

ERrOR: Improving Performance and Fault Tolerance Using Early...

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IEEE Symposium on On-Line Testing (IOLTS)

作者： Raj Kumar Choudhary Janeel Patel Virendra Singh Computer Architecture and Dependable Systems Laboratory Indian Institute of Technology Bombay India

Contemporary integrated circuits are becoming increasingly susceptible to soft errors due to single-event upsets, effectively decreasing the reliability of operation. In this paper, we propose the ERrOR microarchitecture, that detects soft errors in processor operation using temporal redundancy with minimal hardware overhead. Previous proposals have explored the idea of introducing an Early Execution Unit (EXU) at the processor frontend in order to expeditiously execute dynamic instructions with short dependency chains for performance improvement. However, we observe that the functional units in the EXU are idle for a significant fraction of the program execution duration. ERrOR leverages these inactive frontend functional units to re-execute dynamic instructions for the purpose of error detection. A lightweight verifier introduced at the backend makes use of idle resources for redundant execution by interleaving program execution with re-execution for error detection. ERrOR provides exhaustive transient fault coverage while improving performance by 7.5% over an existing restricted OoO microarchitecture, Freeflow Core.

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Flashabacus: A self-governing flash-based accelerator for low-power systems

arXiv

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arXiv 2018年

作者： Zhang, Jie Jung, Myoungsoo Computer Architecture and Memory Systems Laboratory School of Integrated Technology Yonsei University

Energy efficiency and computing flexibility are some of the primary design constraints of heterogeneous computing. In this paper, we present FlashAbacus, a data-processing accelerator that self-governs heterogeneous kernel executions and data storage accesses by integrating many flash modules in lightweight multiprocessors. The proposed accelerator can simultaneously process data from different applications with diverse types of operational functions, and it allows multiple kernels to directly access flash without the assistance of a host-level file system or an I/O runtime *** prototype FlashAbacus on a multicore-based PCIe platform that connects to FPGA-based flash controllers with a 20 nm node process. The evaluation results show that FlashAbacus can improve the bandwidth of data processing by 127%, while reducing energy consumption by 78.4%, as compared to a conventional method of heterogeneous computing. Copyright © 2018, The Authors. All rights reserved.

关键词： Energy utilization

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Early Execution for Soft Error Detection

Early Execution for Soft Error Detection

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International Conference on VLSI Design

作者： Raj Kumar Choudhary Janeel Patel Virendra Singh Computer Architecture and Dependable Systems Laboratory Indian Institute of Technology Bombay India

Single event upsets have made modern integrated circuits more susceptible to soft errors, making their operation less reliable. In order to detect induced computational faults, we propose a fault-tolerant, low-overhead microarchitecture that detects soft errors using temporal redundancy. The idea of introducing an Early Execution Unit (EXU) at the processor frontend has been explored by previous proposals in order to execute dynamic instructions with short dependency chains expeditiously for performance improvement. However, we observe that the functional units in the EXU are idle for a significant portion of the program execution duration. Our proposed microarchitecture utilises these inactive frontend functional units in order to re-execute dynamic instructions to ascertain computational correctness. A low-overhead backend verifier leverages idle resources for redundant execution using the proposed priority-based scheduling algorithm that interleaves program execution with re-execution for error detection. Our proposal provides exhaustive transient fault coverage while improving performance by 7.5% over an existing restricted OoO microarchitecture, Freeflow Core, delivering IPC close to that of an out-of-order baseline, while being $1.78 \times $ more energy-efficient than the involuted, power-hungry out-of-order design.

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FUSE: Fusing STT-MRAMinto GPUs to alleviate off-chip memory access overheads

arXiv

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arXiv 2019年

作者： Zhang, Jie Jung, Myoungsoo Kandemir, Mahmut Taylan Computer Architecture and Memory Systems Laboratory Yonsei University Pennsylvania State University

In this work, we propose FUSE, a novel GPU cache system that integrates spin-Transfer torque magnetic random-Access memory (STT-MRAM) into the on-chip L1D cache. FUSE can minimize the number of outgoing memory accesses over the interconnection network of GPU-s multiprocessors, which in turn can considerably improve the level of massive computing parallelism in GPUs. Specifically, FUSE predicts a read-level of GPU memory accesses by extracting GPU runtime information and places write-once-read-multiple (WORM) data blocks into the STT-MRAM, while accommodating write-multiple data blocks over a small portion of SRAM in the L1D cache. To further reduce the off-chip memory accesses, FUSE also allows WORM data blocks to be allocated anywhere in the STT-MRAM by approximating the associativity with the limited number of tag comparators and I/O peripherals. Our evaluation results show that, in comparison to a traditional GPU cache, our proposed heterogeneous cache reduces the number of outgoing memory references by 32% across the interconnection network, thereby improving the overall performance by 217% and reducing energy cost by 53%. Copyright © 2019, The Authors. All rights reserved.

关键词： Graphics processing unit

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