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检索条件"任意字段=14th ACM Symposium on Access Control Models and Technologies"

共 462 条记录，以下是121-130 订阅

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Integrate and Fire Neuron Implementation using CMOS Predictive Technology Model for 32nm 34

Integrate and Fire Neuron Implementation using CMOS Predicti...

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34th symposium on Microelectronics Technology and Devices (SBMicro)

作者： Maranhao, Gabriel Guimaraes, Janaina G. Univ Brasilia Dept Elect Engn Brasilia DF Brazil Univ Fed Santa Catarina Dept Control Automat & Comp Engn Blumenau Brazil

ISBN: (纸本)9781728119090

the propose of this work is to evolve the studies on neuromorphic circuits by simulating transistors models that look the most with the ones used in commercial process. Since most of data about company models contain a restricted access, some universities provide predictions models to reproduce the real ones. In this paper we present a silicon analog integrate and fire neuron (I&F), proposed by G. Indiveri as a part of a neuromorphic device. Using 32nm CMOS technology simulated in LTspice with BSIM4v4 and applying predictive parameters provides by Predictive Technology Model (PTM), we were able to reduce the source power, to 0.9V, and chip size of the latest design which was implemented using a 180nm CMOS process at 1.8 power supply.

关键词： Spike Neuron Predictive Model CMOS Neuromorphic Circuit

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Combinatorics and Geometry for the Many-ported, Distributed and Shared Memory Architecture

Combinatorics and Geometry for the Many-ported, Distributed ...

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International symposium on Networks-on-Chip (NOCS)

作者： Hao Luan Alan Gatherer Futurewei Technologies Inc. Plano Texas USA

ISBN: (数字)9781728188478

ISBN: (纸本)9781728188485

Manycore SoC architectures based on on-chip shared memory are preferred for flexible and programmable solutions in many application domains. However, the development of many ported memory is becoming increasingly challenging as we approach the end of Moores Law while systems requirements demand larger shared memory and more access ports. Memory can no longer be designed simply to minimize single transaction access time, but must take into account the functionality on the SoC. In this paper we examine a common large memory usage in SoC, where the memory is used as storage for large buffers that are then moved for time scheduled processing. We merge two aspects of many ported memory design, combinatorial analysis of interconnect, and geometric analysis of critical paths, extending both to show that in this case the SoC performance benefits significantly from a hierarchical, distributed and staged architecture with lower-radix switches and fractal randomization of memory bank addressing, along with judicious and geometry aware application of speed up. the results presented show the new architecture supports 20% higher throughput with 20% lower latency and 30% less interconnection area at approximately the same power consumption. We demonstrate the flexibility and scalability of this architecture on silicon from a physical design perspective by taking the design through layout. the architecture enables a much easier implementation flow that works well with physically irregular port access and memory dominant layout, which is a common issue in real designs.

关键词： Geometry Buffer storage Memory management Layout throughput Silicon System-on-chip

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System Architecture and Data Allocation/Coordination technologies of Autonomous Decentralized Database System for High Assurance 14

System Architecture and Data Allocation/Coordination Technol...

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14th IEEE International symposium on Autonomous Decentralized Systems (ISADS) / 3rd International Workshop on Service Assurance in System Wide Information Management (SASWIM)

作者： Perez-Leguizamo, Carlos Guadalupe Godinez-Borja, J. S. Banco Mexico Cent Bank Operating Syst Dev Div Mexico City DF Mexico

ISBN: (纸本)9781728116723

During the last few years there have been important changes in the way that consumers use the Internet and e-commerce. this exceptional expansion, combined with dynamic interactions with users and providers, is boosting the development of new electronic business models, such as block chain, fintech, bitcoin, Uber, Airbnb, etc. the information systems that support such business processes, usually depend on distributed database systems. these approaches have mostly opted to exploit two important characteristics of this kind of applications: at first, they contain a set of commodity types with a limited inventory. On the other hand, incremental updates are the kind of operations which these items typically involve. In this sense, it is possible to achieve system distribution by using tokens which represent the commodities? instances for sales in e-business. there exist two mainly different mechanisms for distributing tokens: replication and partitioning. Token replication mechanism demands expensive synchronization protocols to provide the consistency of the data. On the other hand, token partitioning, depends on token redistribution strategies which allow dynamic migration of tokens to those servers in which it is needed. Such strategies are developed from the standpoint that the total system can locally be known, and therefore, they fail to address the important problem of how to allocate and coordinate the data to make it adaptive to rapidly changing situations. In this paper, we present Autonomous Decentralized Database System (ADDS) concept and architecture in order to extend the properties of autonomy and decentralization to wide-area distributed database systems. ADDS fundamental technologies confers autonomy and loosely coupling to all the components of the system (databases) and provides a background coordination to adapt the system to evolving situations. Moreover, we present two data allocation and coordination technologies for high response time based on sp

关键词： Autonomous Decentralized Systems high assurance distributed databases data consistency coordination mobile agent

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PART: Pinning Avoidance in RDMA technologies

PART: Pinning Avoidance in RDMA Technologies

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International symposium on Networks-on-Chip (NOCS)

作者： Antonis Psistakis Nikos Chrysos Fabien Chaix Marios Asiminakis Michalis Giannioudis Pantelis Xirouchakis Vassilis Papaefstathiou Manolis Katevenis Institute of Computer Science Foundation for Research and Technology – Hellas (FORTH) Herakleion Crete Greece

ISBN: (数字)9781728188478

ISBN: (纸本)9781728188485

State-of-the-art Remote Direct Memory access (RDMA) engines pin communication buffers, complicating the programming model, limiting the memory utilization, and mandating a separate memory translation subsystem spanning the network interface card and the OS. In this paper, we introduce PART, a page fault handling mechanism suitable for emerging nodes that integrate the NI with the main processor. PART does not need to pin pages, thus any process buffer can be used for communication, and resolves occasional page-faults dynamically, when the network accesses the memory, by reusing the RDMA transport. Additionally, PART leverages the I/O Memory Management Unit (IOMMU) which is next to the processor in order to translate virtual to physical addresses, thus reducing cost and complexity. We implement and evaluate PART in a cluster of 16 nodes and 64 ARM cores. We evaluate the performance of transfers for varying page fault frequency, and examine optimizations that proactively page-in all pages upon the first page fault or ahead of the transfer, providing useful insights that can be used to optimize runtimes. Our results show that PART completes one-page transfers with a minor page-fault at the destination in approximately 38 μsecs, while the slowdown on 1MB transfers that experience faults in all pages is as little as 2.6x compared to the no-page-fault case. Page faults are expected to be rare in HPC setups: the performance of LAMMPS in our cluster is virtually unaffected when pages are handled dynamically using PART.

关键词： Runtime Memory management Programming Software Pins Network interfaces Optimization

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Issues and challenges of access control in the cloud 14

Issues and challenges of access control in the cloud

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14th International Conference on Web Information Systems and technologies, WEBIST 2018

作者： Lonetti, Francesca Marchetti, Eda ISTI-CNR Via G. Moruzzi 1 Pisa Italy

ISBN: (纸本)9789897583247

Cloud computing offers scalable and efficient information sharing and storage resources. However, the risk of security breaches for personal and private data in this computing environment is very high. access control is among the most adopted means to assure that sensible information or resources are correctly accessed. this paper provides an overview of main access control models in cloud infrastructures discussing most important challenges. In particular, focusing on access control policy specification, analysis, verification and enforcement, we also identify some emerging issues and point out some solutions and future research directions for cloud computing. Copyright © 2018 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved

关键词： Cloud storage

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Virtualized End-to-End Management Functions for Aggregated control of Video Traffic Flows 14

Virtualized End-to-End Management Functions for Aggregated C...

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14th acm International symposium on QoS and Security for Wireless and Mobile Networks (Q2SWinet)

作者： Ravindran, Kaliappa Cherian, Ancy Adiththan, Arun CUNY City Coll New York NY 10031 USA

ISBN: (纸本)9781450359634

the paper describes the management and control (M&C) functions of various network nodes in an end-to-end rate-adaptive video transport system. Mobile user devices download video clips by sharing the underlying network path from an ingress node. At the core software level, M&C functions realize the well-known AIMD (additive increase multiplicative decrease) based video rate control algorithm to handle congestion along the path. AIMD is exercised on the aggregated data flows at a source ingress node based on the 'loss reports' signaled from the receiver egress node. Our aggregated AIMD-based control reduces the signaling overhead, relative to the existing approaches that anchor an AIMD instance on each user device itself. this offers scalability, while improving the user-experienced QoS: namely, low jitter in transfer rate, fast convergence to a final rate, and fair sharing of bandwidth. the offloading of aggregated AIMD-based control to the in-network overlay nodes also allows a reduction in the overall bandwidth usage. the software handling of 'last-mile' issues in the path between user devices and egress nodes (such as greedy users and access network channel sharing) are discussed, in a context of fine-granular video encoders in the devices. the paper also shows a virtualization of our M&C functions (as VNF modules) for deployment in large-scale video distribution networks: such as YouTube.

关键词： AIMD-based Rate control Quality of Adaptation Scalable Video Encoding Multi-step Congestion Recovery

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CTMA: A More Efficient Channel access Method for Networks with Hidden Terminals 14

CTMA: A More Efficient Channel Access Method for Networks wi...

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14th acm symposium on Performance Evaluation of Wireless Ad Hoc, Sensor, and Ubiquitous Networks (PE-WASUN)

作者： Garcia-Luna-Aceves, J. J. Univ Calif Santa Cruz Comp Engn Dept Santa Cruz CA 95064 USA PARC Palo Alto CA 94304 USA

ISBN: (纸本)9781450351669

controlled-Tones Multiple access (CTMA) is introduced for efficient channel access in wireless networks with hidden terminals. CTMA is based on the integration of collision-avoidance handshakes with tones indicating the ongoing reception of data packets or the acknowledgment of data packets. CTMA organizes the total bandwidth into a data channel and a control channel. Requests to transmit (RTS) and data packets are sent over the data channel, and tones are sent over the control channel. It is shown that a specific variant of CTMA using two tones (CTMA-2T) prevents data packets from colliding with other transmissions. the throughput of CTMA-2T is compared with the throughput of CSMA/CA and dual busy-tone multiple access (DBTMA), and the results of the analysis show that CTMA-2T is a more efficient channel-access scheme than the alternatives.

关键词： channel access collision avoidance multiple access

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Mining Relationship-Based access control Policies 22

Mining Relationship-Based Access Control Policies

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22nd acm symposium on access control models and technologies (SacmAT)

作者： thang Bui Stoller, Scott D. Li, Jiajie SUNY Stony Brook Stony Brook NY 11794 USA

ISBN: (纸本)9781450347020

Relationship-based access control (ReBAC) provides a high level of expressiveness and flexibility that promotes security and information sharing. We formulate ReBAC as an object-oriented extension of attribute-based access control (ABAC) in which relationships are expressed using fields that refer to other objects, and path expressions are used to follow chains of relationships between objects. ReBAC policy mining algorithms have potential to significantly reduce the cost of migration from legacy access control systems to ReBAC, by partially automating the development of a ReBAC policy from an existing access control policy and attribute data. this paper presents an algorithm for mining ReBAC policies from access control lists (ACLs) and attribute data represented as an object model, and an evaluation of the algorithm on four sample policies and two large case studies. Our algorithm can be adapted to mine ReBAC policies from access logs and object models. It is the first algorithm for these problems.

关键词： relationship-based access control attribute-based access control policy mining

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PE-WASUN 2017 - Proceedings of the 14th acm symposium on Performance Evaluation of Wireless Ad Hoc, Sensor, and Ubiquitous Networks, Co-located with MSWiM 2017

PE-WASUN 2017 - Proceedings of the 14th ACM Symposium on Per...

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14th acm symposium on Performance Evaluation of Wireless Ad Hoc, Sensor, and Ubiquitous Networks, PE-WASUN 2017

ISBN: (纸本)9781450351669

the proceedings contain 12 papers. the topics discussed include: carrier resolution multiple access;CTMA: a more efficient channel access method for networks with hidden terminals;revisiting the analytical modeling of the IEEE 802.11 power save mode for independent basic service sets (IBSS);performance analysis of modified IEEE 802.15.4e MAC for wireless sensor networks;moving towards wireless sensors using RSSI measurements and particle filtering;control of a remote swarm of drones/robots through a local (possibly model) swarm: qualitative and quantitative issues;REPRO: time-constrained data retrieval for edge offloading in vehicular clouds;FinalComm: leveraging dynamic communities to improve forwarding in DTNs;on the energy efficiency and performance of neighbor discovery schemes for low duty cycle IoT devices;performance evaluation of a battery-free videogame controller;on the performance evaluation of distributed resource block and power allocation in D2D-enabled multi-cell networks;and towards multi-instances QoS efficient RPL for smart grids.

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On the application of fuzzy set theory for access control enforcement 14

On the application of fuzzy set theory for access control en...

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14th International Joint Conference on e-Business and Telecommunications, ICETE 2017

作者： Regateiro, Diogo Domingues Pereira, Óscar Mortagua Aguiar, Rui L. Instituto de Telecomunicaçoes DETI Universidade de Aveiro Aveiro3810-193 Portugal

ISBN: (纸本)9789897582592

access control is a vital part of any computer system. When it comes to access to data, deterministic access control models such as RBAC are still widely used today, but they lack the flexibility needed to support some recent scenarios. these include scenarios where users and data can be dynamically added to a system, which emerged from IoT and big data contexts. Such scenarios include data from network operators, smart cities, etc. thus, models that are able to adapt to these dynamic environments are necessary. Non-deterministic access control models fall into this approach, as they introduce new ways of mapping users to permissions and resources, but lack the auditing capabilities of deterministic models. In this paper, the usage of these models will be defended and argued for. In particular, a solution based on fuzzy set theory is proposed as it is thought to be able to provide some flexibility benefits of non-deterministic models, while giving some assurance to security experts that the resources are not accessed by unexpected users. Copyright © 2017 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved.

关键词： Fuzzy set theory

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