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Predicting the friction angle of clays using a multi-layer perceptron neural network enhanced by yeo-johnson transformation and coral reefs optimization

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Journal of Rock Mechanics and Geotechnical engineering 2024年第10期16卷 3982-4003页

作者： Libing Yang Trung Nguyen-Thoi Trung-Tin Tran College of Civil Engineering and Architecture Hunan Institute of Science and TechnologyYueyang414006China Laboratory for Applied and Industrial Mathematics Institute for Computational Science and Artificial IntelligenceVan Lang UniversityHo Chi Minh CityViet Nam Faculty of Mechanical-Electrical and Computer Engineering School of TechnologyVan Lang UniversityHo Chi Minh CityViet Nam Department of Information Technology Greenwich VietnamFPT UniversityDa Nang550000Viet Nam

The accurate prediction of the friction angle of clays is crucial for assessing slope stability in engineering *** study addresses the importance of estimating the friction angle and presents the development of four soft computing models:YJ-FPA-MLPnet,YJ-CRO-MLPnet,YJ-ACOC-MLPnet,and *** of all,the Yeo-Johnson(YJ)transformation technique was used to stabilize the variance of data and make it more suitable for parametric statistical models that assume normality and equal *** technique is expected to improve the accuracy of friction angle prediction *** friction angle prediction models then utilized multi-layer perceptron neural networks(MLPnet)and metaheuristic optimization algorithms to further enhance performance,including flower pollination algorithm(FPA),coral reefs optimization(CRO),ant colony optimization continuous(ACOC),and cuckoo search algorithm(CSA).The prediction models without the YJ technique,***-MLPnet,CRO-MLPnet,ACOC-MLPnet,and CSA-MLPnet,were then compared to those with the YJ technique,***-FPA-MLPnet,YJ-CRO-MLPnet,YJ-ACOC-MLPnet,and *** these,the YJ-CRO-MLPnet model demonstrated superior reliability,achieving an accuracy of up to 83%in predicting the friction angle of clay in practical engineering *** improvement is significant,as it represents an increase from 1.3%to approximately 20%compared to the models that did not utilize the YJ transformation technique.

关键词： Natural hazards Slope stability Friction angle Clay Soft computing models Geotechnical engineering

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A Survey of Recent Developments in Testability, Safety and Security of RISC-V Processors

A Survey of Recent Developments in Testability, Safety and S...

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IEEE European Test Symposium (ETS)

作者： Jens Anders Pablo Andreu Bernd Becker Steffen Becker Riccardo Cantoro Nikolaos I. Deligiannis Nourhan Elhamawy Tobias Faller Carles Hernandez Nele Mentens Mahnaz Namazi Rizi Ilia Polian Abolfazl Sajadi Mathias Sauer Denis Schwachhofer Matteo Sonza Reorda Todor Stefanov Ilya Tuzov Stefan Wagner Nuša Zidarič Institute of Smart Sensors University of Stuttgart Stuttgart Germany Universitat Politècnica de València Spain Dpt. of Computer Science University of Freiburg Freiburg Germany Institute of Software Engineering University of Stuttgart Stuttgart Germany Dpt. of Control and Computer Engineering Politecnico di Torino Turin Italy Institute of Computer Architecture and Computer Engineering University of Stuttgart Stuttgart Germany LIACS Leiden University Leiden Netherlands Advantest Europe Boeblingen Germany

With the continued success of the open RISC-V architecture, practical deployment of RISC-V processors necessitates an in-depth consideration of their testability, safety and security aspects. This survey provides an overview of recent developments in this quickly-evolving field. We start with discussing the application of state-of-the-art functional and system-level test solutions to RISC-V processors. Then, we discuss the use of RISC-V processors for safety-related applications; to this end, we outline the essential techniques necessary to obtain safety both in the functional and in the timing domain and review recent processor designs with safety features. Finally, we survey the different aspects of security with respect to RISC-V implementations and discuss the relationship between cryptographic protocols and primitives on the one hand and the RISC-V processor architecture and hardware implementation on the other. We also comment on the role of a RISC-V processor for system security and its resilience against side-channel attacks.

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Using Intent Directed Acyclic Graphs in Multi-Domain IP-Optical Networks

Using Intent Directed Acyclic Graphs in Multi-Domain IP-Opti...

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Australasian Telecommunication Networks and Applications Conference, ATNAC

作者： Filippos Christou Andreas Kirstädter Institute of Communication Networks and Computer Engineering (IKR) University of Stuttgart Stuttgart Germany

The global internet relies on a well-coordinated operation of distinct networking domains. This renders multi-domain networking at the heart of today's massive digital information exchange. Although Software-Defined Networking (SDN) undoubtedly helps advance network operation within a single organization, non-centralized multi-domain networking has received less attention. To significantly advance the state of networking, we are inherently bound to provide progress and evolve the current multi-domain networking scheme. This work exploits the Intent-Based Networking (IBN) paradigm and the Directed Acyclic Graphs (DAGs) data structure to design a novel architecture for multi-domain IP-Optical networking. We highlight the benefits of our approach leading to seamless operation of non-centralized networks, such as optically transparent domain boundaries and cross-domain grooming. We evaluate this approach in a realistic scenario using our novel open-source tool ***, which we shortly introduce and can be broadly used for related research.

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Availability Estimation of Optical Network Links Using Multilevel Bayesian Modeling

Availability Estimation of Optical Network Links Using Multi...

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International Conference on Optical Network Design and Modeling, ONDM

作者： Filippos Christou Institute of Communication Networks and Computer Engineering (IKR) University of Stuttgart Stuttgart Germany

Estimating availability in transport networks is essential to successfully provision connectivity services under various requirements. As modern Service Level Agreements (SLAs) are becoming more demanding, it is crucial to estimate the true availability of an end-to-end path as soon and reliably as possible. Network operators might have expert knowledge regarding the theoretical availability of the network components, or they might have some measured data to infer such information. However, in either case, the true steady-state availability is unknown and must be inferred as a combination of the above. Traditionally, the estimation of Quality of Service (QoS) metrics, like availability, is done by producing a scalar value as an approximation. This can often be misleading and an oversimplification. In this paper, we build a multilevel Bayesian model that provides a probabilistic estimate of all network links’ availability by exploiting expert knowledge and the underlying data. The value of this methodology is greater for scenarios with scarce data, where the inference quality demonstrates remarkable stability regardless of the randomness of the incoming data. We demonstrate the effectiveness of our approach through simulation experiments and compare our results with the empirical interval availability. Our work has important implications for the design and management of optical networks since it constitutes a valuable tool that provides accurate availability estimations, which can be used for sophisticated decision-making.

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Distributed Voltage Regulation of Distribution Network Based on Partition Control 2

Distributed Voltage Regulation of Distribution Network Based...

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2nd International Conference on Cyber-Energy Systems and Intelligent Energy, ICCSIE 2024

作者： Jine, Wang Hui, Chen Liying, Zhao Guangxin, Zhang School of Electrical Information Changchun University of Architecture and Civil Engineering Changchun City China School of Computer Technology and Engineering Changchun Institute of Technology Changchun City China School of Information and Engineering College of Science & Technology Ningbo University Ningbo City China

ISBN: (纸本)9798350373318

As China's social economy progresses, the amount of equipment in distribution networks continues to grow, leading to increasingly complex system operations. In this environment, traditional centralized control methods consume excessive computing resources and fail to achieve the processing speeds required by modern intelligent distribution networks. To address these challenges, this article introduces the concept of electrical distance to segment the distribution network and proposes voltage regulation algorithms based on the alternating direction multiplier method and dual ascent method for efficient distributed voltage regulation. © 2024 IEEE.

关键词： DC distribution systems

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Side-channel Attacks on Memristive Circuits Under External Disturbances

Side-channel Attacks on Memristive Circuits Under External D...

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Asian Test Symposium (ATS)

作者： Li-Wei Chen Xianyue Zhao Ziang Chen Nan Du Ilia Polian Institute of Computer Architecture and Computer Engineering University of Stuttgart Stuttgart Germany Department of Quantum Detection Institute for Solid State Physics Friedrich Schiller University Jena Leibniz Institute of Photonic Technology (IPHT) Jena Germany

Quick progress in memristive technologies has led to their consideration for several potential applications, many of which are security-critical. New possibilities of memristors, including their unique combination of non-volatile storage and compute capabilities, make them particularly attractive to edge applications, which are physically exposed to their users and therefore to potential attackers. Therefore, practical deployment of memristive circuitry for, e.g., cryptographic (sub-)modules or on-chip neural network inference, is only feasible when their vulnerability to physical attacks is understood and addressed. We evaluate experimentally one relevant class of physical attacks, namely side-channel attacks, under varying external conditions, namely temperature and magnetic fields. Using a small cryptographic construction, we evaluate both white-box and black-box attack varieties, using respective cryptanalytic techniques. Our results show that, while non-nominal conditions can complicate attacks, the information leakage remains and the secrets are extractable with additional knowledge about the memristive devices. This suggests the need to consider possible external disturbances during security evaluation.

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Secrets Leaking Through Quicksand: Covert Channels in Approximate Computing

Secrets Leaking Through Quicksand: Covert Channels in Approx...

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IEEE European Test Symposium (ETS)

作者： Lorenzo Masciullo Roberto Passerone Francesco Regazzoni Ilia Polian Department of Information Engineering and Computer Science University of Trento Italy University of Amsterdam Amsterdam The Netherlands Universita Della Svizzera Italiana Lugano Switzerland Institute of Computer Architecture and Computer Engineering University of Stuttgart Germany

Approximate computing (AxC) has emerged as an attractive architectural paradigm especially for artificial-intelligence applications, yet its security implications are being neglected. We demonstrate a novel covert channel where the malicious sender modulates transmission by switching between regular and AxC realizations of the same computational task. The malicious receiver identifies the transmitted information by either reading out the workload statistics or by creating controlled congestion. We demonstrate the channel on both an Android simulator and an actual smartphone and systematically study measures to increase its robustness. The achievable transmission rates are comparable with earlier covert channels based on power consumption, but the malicious behavior of our channel is more stealthy and less detectable.

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On the Impact of Billing Cycles on Compensations in Network SLAs 25

On the Impact of Billing Cycles on Compensations in Network ...

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25th International Conference on Optical Network Design and Modelling, ONDM 2021

作者： Enderle, Tobias University of Stuttgart Institute of Communication Networks and Computer Engineering Stuttgart Germany

ISBN: (纸本)9783903176331

Network connections in optical backbone networks are subject to failures and the network operator is obliged to compensate its customers according to the terms of the service level agreement (SLA) if outages have occurred. These compensations are typically made after regular billing cycles. In most SLAs the billing cycle has a length of one calendar month. However, the length of the billing cycle has a significant impact on the compensation that is to be paid by the network operator. To show this, we first derive the exact distribution of the downtime per billing cycle for dedicated path-protected connections with exponential failure and repair times. Based on this, we derive the expected amount of compensation for different SLA compensation policies. We show that, depending on the failure and repair characteristics of the network components, there is a billing cycle for which the expected amount of compensation is maximized and hence is to be avoided. Consequently, the adjustment of the billing cycle to the failure and repair characteristics or vice versa can play an important role in the optimal design of SLAs. © 2021 IFIP TC6 WG6.10.

关键词： Availability

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Accelerate Bit Manipulation in XiangShan Processer Using RISC-V B Extension and Instruction Fusion

Accelerate Bit Manipulation in XiangShan Processer Using RIS...

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2022 International Conference on Cloud Computing, Internet of Things, and computer Applications, CICA 2022

作者： Zhang, Fawang Tang, Dan Cai, Ye College of Computer Science and Software Engineering Shenzhen University Shenzhen China State Key Laboratory of Computer Architecture Institute of Computing Technology Beijing China

ISBN: (纸本)9781510656673

In the field of high-performance computing, some application scenarios make extensive use of bit manipulation. RISC-V foundation issues B extension to reduce the number of instructions during the static compilation. But this extension does not cover the more frequent operations fully. Instruction fusion technology can fuse multiple instructions into one instruction at the decode stage to dynamically reduce the number of instructions. Therefore, this technology can supplement RISC-V B extension uncovered instruction, enhancing the processor’s capabilities for bit manipulation. This paper implements the RISC-V B extension 1.0 version on the Xiangshan processor. For accelerating more bit manipulation, we profiled general benchmarks by the simulator, proposed ten new instructions fusion targets, and implemented a fusion decode unit. Finally, we use Coremark and SPEC CPU 2006 integer to evaluate the performance. The Coremark results show that dynamic instructions reduce by 18.14%, and the performance improves by 12.09%. © 2022 SPIE.

关键词： Decoding

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Performance Evaluation of Infrastructure as a Service across Cloud Service Providers

Performance Evaluation of Infrastructure as a Service across...

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2023 International Electrical engineering Congress, iEECON 2023

作者： Sithiyopasakul, Saran Archevapanich, Tuanjai Purahong, Boonchana Sithiyopasakul, Paisan Lasakul, Attasit Benjangkaprasert, Chawalit School of Engineering King Mongkut's Institute of Technology Ladkrabang Department of Computer Engineering Bangkok Thailand Rajamangala University of Technology Suvarnabhumi Faculty of Engineering and Architecture Department of Electronics and Communication Engineering Nonthaburi Thailand

ISBN: (纸本)9798350332360

The purpose of this research aims to monitor, analyze, and compare the performance of infrastructure as a service (IaaS) between the selective cloud providers. To assure which cloud provider has more stability, reliability, and scalability. This paper focuses on performance testing based on a deployed web server in the cloud environment. The main feature of cloud computing is scalability thus most common IaaS cloud service providers (CSPs) have Auto Scaling features for instances or virtual machines. Not only does this paper gives the experimental results of the scaling scalability testing, but it also provides the results of recovery testing to inspect how long a web server is able to recover from failures and load testing which simulated traffic requests. Testing was conducted in the major public clouds of Google Cloud Platform (GCP), Microsoft Azure, and Amazon Web Services (AWS). Azure performs the most efficiently of almost all testing but hardest to configure. © 2023 IEEE.

关键词： Virtual machine

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