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检索条件"任意字段=13th ACM Symposium on Access Control Models and Technologies"

共 483 条记录，以下是61-70 订阅

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Simulation of an Energy Management Test Bench for Hybrid Storage System Extensions to a Wind Energy Plant 13

Simulation of an Energy Management Test Bench for Hybrid Sto...

引用

13th International symposium on Power Electronics for Distributed Generation Systems (PEDG)

作者： Mielach, Antonio Redmann, Florian Orlik, Bernd Raffel, Holger Univ Bremen Inst Elect Drives Power Elect & Devices Bremen Germany Univ Bremen Bremer Ctr Mechatron Bremen Germany

ISBN: (数字)9781665466189

ISBN: (纸本)9781665466189

To combine the advantages of different storage technologies, hybrid storage systems can be used. Next to the classical technologies, like super capacitors and battery systems (mostly lithium-ion today), the production and/or reelectrification of hydrogen has become an important topic. With each type of storage, the management of the existing energy budget becomes more complex, as their specific properties have to be considered when optimizing the distribution. To support the iterative design process of this energy management, models of all the involved components have to be designed to be detailed enough to cover the main behavior, but still perform well enough to iterate at a meaningful rate when included into one comprehensive model. this comprehensive model ideally offers an easy way to introduce the higher order control strategy and change parameters without having to look into the models of the different plants themselves. this is why the combination of these plants can be interpreted as a virtual test bench: Different control and management strategies can be inserted in a separate module and can be tested under the same conditions as their competing or previous versions.

关键词： hybrid storage battery hydrogen modelling control energy management

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FTM Implementation and Ranging Performance Characterization for Indoor Localization 13

FTM Implementation and Ranging Performance Characterization ...

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13th IEEE Global Conference on Consumer Electronic, GCCE 2024

作者： Hirata, Rei Koizumi, Atsushi Oguma, Hiroshi Sakaguchi, Naotaka Sumi, Takenori Nagai, Yukimasa Nit Toyama College Department of Control Information System Enginering 1-2 Ebie-Neriya Toyama Imizu933-0239 Japan Mitsubishi Electric Corporation Information Technology R&d Center 5-1-1 Ofuna Kanagawa Kamakura247-8501 Japan

ISBN: (纸本)9798350355079

Indoor positioning technologies for IoT sensing are attracting attention. We are currently exploring standard indoor positioning methods using IEEE 802.11 / Wi-Fi. In this paper, we utilize the IEEE802.11-2016 FTM (Fine Timing Measurement) protocol, which enables to calculate distances between devices and access points (APs). the ranging accuracy of FTM, however, varies depending on multipath propagation of wireless signals and device-specific factors. therefore, we implemented FTM on two models, Google Pixel4 and Zenfone9, and conducted experiment studies in the gymnasium and corridor of our school to evaluate position detection accuracy. In the gymnasium, the average error was 1.42 m for Zenfone9, while 1.07 m for Pixel4. In the corridor, the average error was 0.66m for Zenfone9, whereas 2.47 m for Pixel4. © 2024 IEEE.

关键词： FTM Indoor Localization IoT sensing machine dependence Round Trip Time

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A Comprehensive Study on Security and Privacy of E-Health Cloud-Based System 1

引用

13th Computer Science Online Conference

作者： Ali, Sadaquat Univ Warwick WMG Cyber Secur Ctr Coventry W Midlands England

ISBN: (数字)9783031703003

ISBN: (纸本)9783031702990;9783031703003

Today, a growing number of individuals and organisations are considering distributing resources in this manner, considering recent technological developments involving "the cloud". Due to the sensitive and critical nature of patient information, IT and networks have not been widely used in healthcare systems for a long period. E-health systems have recently benefited from the high levels of accessibility, ease of access, durability, efficiency, usefulness, and automation of the various cloud models. E-health refers to health services and information provided or improved on the Internet and other techniques. Health information and communication technology (HIT) can improve the delivery locally, regionally, and globally. In this paper, we review different studies based on the security and privacy concerns of electronic health records (EHRs). We also identified different security challenges for data storage in the cloud. Furthermore, in the end of the paper open challenges are discussed with the future predictions of an EHR system. #CSOC1120

关键词： E-health Security Challenges Cloud Computing Health Information and Communication technologies (HIT)

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Proceedings of acm symposium on access control models and technologies, SacmAT

Proceedings of ACM Symposium on Access Control Models and Te...

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24th acm symposium on access control models and technologies, SacmAT 2019

ISBN: (纸本)9781450367530

the proceedings contain 27 papers. the topics discussed include: access control for binary integrity protection using ethereum;FriendGuard: a friend search engine with guaranteed friend exposure degree;brokering policies and execution monitors for IoT middleware;expat: expectation-based policy analysis and enforcement for appified smart-home platforms;owner-centric sharing of physical resources, data, and data-driven insights in digital ecosystems;IoT passport: a blockchain-based trust framework for collaborative Internet-of-things;an OpenRBAC semantic model for access control in vehicular networks;toward detection of access control models from source code via word embedding;and on the difficulty of using patient's physiological signals in cryptographic protocols.

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Elastic Cloud Services: Scaling Snowflake's control Plane 13

Elastic Cloud Services: Scaling Snowflake's Control Plane

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13th Annual acm symposium on Cloud Computing (SoCC)

作者： Melissaris, themis Nabar, Kunal Radut, Rares Rehmtulla, Samir Shi, Arthur Chandrashekar, Samartha Papapanagiotou, Ioannis Snowflake Inc Bozeman MT 59715 USA Gemini Trust New York NY USA

ISBN: (纸本)9781450394147

Snowflake's "Data Cloud", provided as Software-as-a-Service (SaaS), enables data storage, processing, and analytic solutions in a performant, easy to use, and flexible manner. Although cloud service providers provide the foundational infrastructure to run and scale a variety of workloads, operating Snowflake on cloud infrastructure presents interesting challenges. Customers expect Snowflake to be available at all times and to run their workloads with high performance. Behind the scenes, the software that runs customer workloads needs to be serviced and managed. Additionally, failures in individual components such as Virtual Machines (VM) need to be handled without disrupting running workloads. As a result, lifecycle management of compute artifacts, their scheduling and placement, software rollout (and rollback), replication, failure detection, automatic scaling, and load balancing become extremely important. In this paper, we describe the design and operation of Snowflake's Elastic Cloud Services (ECS) layer that manages cloud resources at global scale to meet the needs of the Snowflake Data Cloud. It provides the control plane to enable elasticity, availability, fault tolerance and efficient execution of customer workloads. ECS runs on multiple cloud service providers and provides capabilities such as cluster management, safe code rollout and rollback, management of pre-started pools of running VMs, horizontal and vertical autoscaling, throttling of incoming requests, VM placement, load-balancing across availability zones and cross-cloud and cross-region replication. We showcase the effect of these capabilities through empirical results on systems that execute millions of queries over petabytes of data on a daily basis.

关键词： Digital storage

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Poster: Towards Cloud-Based Software for Incorporating Time and Location into access control Decisions 21

Poster: Towards Cloud-Based Software for Incorporating Time ...

引用

26th acm symposium on access control models and technologies (SacmAT)

作者： Al Lail, Mustafa Texas A&M Int Univ Laredo TX 78041 USA

ISBN: (纸本)9781450383653

the increasing dependency on cloud computing has drawn attention to the security weaknesses of cloud providers. Not only how information is accessed, but also where and when have become important considerations in cloud security. Certain situations exist where it is necessary to restrict access to cloud resources based on time and location. An example is a policy for a medical institution where doctors can only access patient records at hospitals during their shifts. the Generalized Spatio-Temporal Role-Based access control model (GSTRBAC) determines users' access to resources based on such information. this poster proposes a cloud-based software architecture and outlines it possible implementation of the GSTRBAC model.

关键词： access control authorization software location time

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Towards a theory for Semantics and Expressiveness Analysis of Rule-Based access control models 21

Towards a Theory for Semantics and Expressiveness Analysis o...

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26th acm symposium on access control models and technologies (SacmAT)

作者： Masoumzadeh, Amirreza Narendran, Paliath Iyer, Padmavathi Univ Albany SUNY Albany NY 12222 USA

ISBN: (纸本)9781450383653

Recent access control models such as attribute-based access control and relationship-based access control allow flexible expression of authorization policies using the concepts of rules and conditional expressions. the independent nature of policy rules from each other and the amount of flexibility that they enjoy (e.g., the type of conditional expressions they support and whether they can permit or deny matching requests) make those policies quite expressive. But how expressive are they? Do we need to enable all possible flexibilities in a rule-based model to achieve the maximum possible expressiveness? Answering such questions is essential in making informed decisions when designing new models or choosing existing models for implementation. In this paper, we propose an approach towards answering those questions by developing a novel theory for capturing the semantics of rule-based policies depending on their support of different constructs such as flexibility of conditional expressions, rule modalities, and conflict resolution. Our formal policy semantics model enjoys an intuitive design that can capture the semantics of various rule-based policies. We show the well-formedness properties of such semantics and how they can be used to analyze the expressive power of a number of rule-based models.

关键词： conditions conditional expressions expressiveness policy analysis rule-based access control semantics

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Towards Unifying RBAC with Information Flow control 21

Towards Unifying RBAC with Information Flow Control

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26th acm symposium on access control models and technologies (SacmAT)

作者： Radhika, B. S. Kumar, Narendra N., V Shyamasundar, R. K. Indian Inst Technol Bombay 400076 Maharashtra India Inst Dev & Res Banking Technol Hyderabad 500057 India

ISBN: (纸本)9781450383653

Role-based access control (RBAC) is one of the most widely implemented access control models. In today's complex computing systems, one of the increasingly sought-after features for reliable security is information flow control. Although RBAC is a policy-neutral and generic model, its implementations generally do not provide information flow control. In this paper, we present two approaches to address this issue. In the first method, we describe how a lattice model can be captured using an RBAC configuration. In the second method, we analyze the information flows in a given RBAC policy using a decentralized lattice model called Readers-Writers Flow Model. this method identifies the indirect information flows in the policy and helps in creating flow-secure RBAC policies. We discuss the scope and limitations of these methods in detail and also present a brief case study. Finally, we investigate the use of flow-secure RBAC policies in creating flow-secure Attribute-based access control (ABAC) policies.

关键词： Role-Based access control Information Flow control Readers-Writers Flow Model ABAC Mining RBAC Flow-Secure Policy

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In-Memory Policy Indexing for Policy Retrieval Points in Attribute-Based access control 21

In-Memory Policy Indexing for Policy Retrieval Points in Att...

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26th acm symposium on access control models and technologies (SacmAT)

作者： Heutelbeck, Dominic Baur, Marc Lucas Kluba, Martin FTK Forschungsinst Telekommunikat & Kooperat eV Dortmund Germany

ISBN: (纸本)9781450383653

Attribute-Based access control (ABAC) systems are using machine-readable rules for making access control decisions. Rules are collected in documents, the named policies, or policy sets. these are expressed in a specific policy language, such as XacmL, ALFA, or SAPL. Within systems implementing the ABAC reference architecture, policy documents are persisted in a Policy Retrieval Point (PRP). this paper addresses the problem of efficiently retrieving policy documents applicable to a given authorization request (or subscription) from the PRP. Applicability is determined by a specific section of the document, commonly named target expression. the target expression consists of matching conditions, more precisely Boolean expressions based on request (or subscription) data. this paper presents a novel in-memory data structure that is used to index policy documents. the index allows retrieving documents matching a given authorization request more efficiently from a large set of policies. the empirical evaluation demonstrates, that the proposed algorithm can reduce policy retrieval time in PRPs by up to 98%, depending on the structure of the policies.

关键词： access control data structures Boolean function search policy languages attribute-based access control

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Mutation Analysis of NGAC Policies 21

Mutation Analysis of NGAC Policies

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26th acm symposium on access control models and technologies (SacmAT)

作者： Chen, Erzhuo Dubrovenski, Vladislav Xu, Dianxiang Univ Missouri Kansas City Dept Comp Sci Elect Engn Kansas City MO 64110 USA

ISBN: (纸本)9781450383653

the NGAC (Next Generation access control) standard for attribute-based access control (ABAC) allows for run-time changes of the permission and prohibition configurations through administrative obligations triggered by access events. It makes access control more fine-grained and dynamic. However, it raises challenges for assuring the correctness of NGAC policies. As policy testing is an important technique for quality assurance, this paper presents an approach to mutation analysis of NGAC policies. It can evaluate the effectiveness of a testing method and reveal potential faults in an inadequately tested policy. the mutation analysis covers various types of potential faults in the assignments, associations, prohibitions, and obligations of NGAC policies. this paper also proposes an incremental testing approach that first validates the initial configuration of a policy and then the policy as a whole. It helps determine whether faults appear in the configuration or the obligations. To evaluate the work, we have developed four working policies and their test suites based on the current NGAC reference implementation. the empirical studies showthat the mutation analysis can shed light on the strengths and weaknesses of the test suites. they also demonstrate the need for developing more cost-effective testing methods.

关键词： access control Next Generation access control (NGAC) mutation testing policy testing

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