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22nd international symposium on parallel and distributed Computing, ISPDC 2023

作者： Sharif, Md Bulbul Hines, Thomas Ghafoor, Sheikh Morales-Hernandez, Mario Dullo, Tigstu Kalyanapu, Alfred Tennessee Technological University Computer Science CookevilleTN United States Oak Ridge National Laboratory Computational Science and Engineering Oak RidgeTN United States Tennessee Technological University Civil and Environmental Engineering CookevilleTN United States

ISBN: (纸本)9798350341270

Predicting the performance of parallel applications at scale is a challenging problem. We have developed a performance prediction model for structured grid-based scientific applications for High Performance Computing systems. Our model can capture the system complexity and consider computation and communication attributes of application performance on HPC architectures. We have also proposed a methodology for obtaining the realistic value of the model parameters by small-scale sample runs of an application on the target system. We have used our model to predict the performance of an actual application (2D Flood Simulation) and a synthetic application (Game of Life) on the Summit supercomputer at Oak Ridge National Laboratory and Stampede2 at Texas Advanced Computing Center. The experimental results indicate that our model's predictive performance is acceptable, and our model was able to predict the performance of these two applications on Summit and Stampede2 with more than 90% accuracy. © 2023 IEEE.

关键词： Supercomputers

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distributed Energy Management for Carbon Neutral Data Centers 22

Distributed Energy Management for Carbon Neutral Data Center...

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22nd IEEE international symposium on parallel and distributed Processing with Applications, ISPA 2024

作者： Liu, Chuyi Wan, Jianxiong Li, Leixiao Ren, Guanyu Wang, Xiaolei Inner Mongolia University of Technology Huhhot China Inner Mongolia Autonomous Region Engineering Technology Research Center of Big Data Based Software Service Huhhot China Research Center of Large-Scale Energy Storage Technologies Huhhot China

ISBN: (纸本)9798331509712

With the continuous expansion of data centers, their carbon emission becomes a serious issue. A number of studies are committing to reduce the carbon emission of data centers. Carbon trading is a promising emission reduction technique which is, however, seldom applied to data centers. To bridge this gap, we propose a carbon-neutral architecture DC2 for distributed data centers, where each data center consists of three subsystems, i.e., energy subsystem for energy supply, thermal subsystem for data center cooling and the carbon subsystem for carbon trading. Then, we formulate the energy management problem as a Decentralized Partially Observable Markov Decision Processe (Dec-POMDP) and develop a distributed solution framework using Multi-Agent Deep Deterministic Policy Gradient (MAD-DPG). Finally, simulations on real-world data shows that the DC2 provides a cost saving of 8.16%, and applying MADDPG saves 10.04% of the overall cost compared to Independent MADDPG. © 2024 IEEE.

关键词： Carbon sequestration

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A smart palletising planning and control model in Logistics 4.0 framework

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international JOURNAL OF PRODUCTION RESEARCH 2023年第24期61卷 8580-8597页

作者： Borangiu, Theodor Raileanu, Silviu Univ Politehn Bucuresti Dept Automat & Ind Informat 313 Splaiul IndependenteiSect 6 Bucharest 060042 Romania

The paper describes a smart model for palletising as main intra-logistics task for product-on-pallet distribution, and its development in Logistics 4.0 framework aligned to Industry 4.0. The model is developed in holonic paradigm as a 2-layer Holonic Logistics Execution System (HLES) in semi-heterarchical topology. Scheduling of logistics activities and allocation to resources are optimised for global efficiency on compact time periods. The logistics model virtualises physical entities: resources, pallets and orders as holons implemented with digital twin software, and categories of task workloads: resource health monitoring, dispatching and tracking pallet orders, re-assigning jobs at resource failure, which grants reality-awareness and robustness. Global workload optimisation uses Constraint Programming as decision making technology with ILOG optimiser engine as situation-specific solver tool in SaaS cloud model, and delegate multi-agent system (MAS) technology for intelligence distribution. The optimised objective function is a combination of palletising cost weighted by robot speed limits and pallet storage cost in payable stocks. The main constructs are exemplified and validated on a real-life structure with multiple palletising resources in which programmable logic controllers (PLC) coordinate locally the parallel execution of order holons according to their globally optimised sequence.

关键词： Integrated logistics engineering advanced planning and scheduling systems palletising combinatorial optimisation distributed MAS

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GIM (Ghost In the Machine): A Coarse -Grained Reconfigurable Compute -In -Memory Platform for Exploring Machine -Learning Architectures

GIM (Ghost In the Machine): A Coarse -Grained Reconfigurable...

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1st international Conference on Smart Energy systems and Artificial Intelligence (SESAI)

作者： Borowicz, Maya Ding, James Fan, Winnie Gao, Zhongqi Jackson, Davis Lu, Ares Rohlfsen, Sophia Simar, Ray Rice Univ Houston TX 77005 USA

ISBN: (纸本)9798350364613;9798350364606

Machine-learning (ML) algorithms are finding wide adoption across a rich spectrum of application domains with diverse requirements in terms of performance, power, and cost. These diverse requirements are making it necessary to explore a large space of ML architectures and reexamine fundamental computational structures, a process of exploration that is very expensive. To get around the costly computations associated with large data sets and long training times, there have been increasing investments in specialized fixed-function hardware. However, this specialized hardware is expensive and hard to generalize to address the spectrum of applications. For our experiments, we focus on a novel, highly parallel, superset ML architecture, and use it to test the capabilities of new coarse-grained FPGAs containing hundreds and thousands of DSP slices with dedicated local storage. These new coarse-grained architectures allow us to achieve ASIC-like clock rate and reductions in power while exploring novel and common ML architectures.

关键词： AMD architecture back propagation coarse grained compute in memory DSP FPGA machine learning neural network parallel processing Rice University RISC V Simulink systolic UltraScale Zync

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DRGC: A Dynamic Redundant Gradient Coding method 14

DRGC: A Dynamic Redundant Gradient Coding method

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14th international symposium on parallel Architectures, Algorithms and Programming, PAAP 2023

作者： Yubin, Chen Weiqiang, Zhong Zuohang, Zhang Wenqing, Zhou Nanchang Hangkong University Software Engineering Nan Chang China Machinery Institute Inner-Mongolia Power Inner Mongolia China

ISBN: (纸本)9798350371024

To solve the Straggler problem which seriously affects computational efficiency in distributed gradient descent (DGD), we design a dynamic redundant gradient coding method(DRGC) based on Reed-Solomon coding with dynamic code words and heartbeat delay-aware mechanism that can monitor the computational progress of workers. Traditional coding method ensures the straggler tolerance through a large of redundant computations, but can't adapt to the change of cluster state. In contrast, DRGC can flexibly adapt to the change by changing the code words base on the cluster state that heartbeat delay-aware mechanism has monitored and determined. Experiments prove that compared with the RS gradient coding, DRGC can further reduce training time. © 2023 IEEE.

关键词： Dynamics

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Benefits of Optimistic parallel Discrete Event Simulation for Network-on-Chip Simulation 27

Benefits of Optimistic Parallel Discrete Event Simulation fo...

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27th IEEE/ACM international symposium on distributed Simulation and Real Time Applications, DS-RT 2023

作者： Bremer, Maximilian Patra, Nirmalendu Nguyen, Tan Vasudevan, Dilip Chan, Cy Lawrence Berkeley National Laboratory Applied Mathematics and Computational Research Division BerkeleyCA94720 United States

ISBN: (纸本)9798350337846

The end of Moore's law has placed a two-fold demand on hardware simulation. Firstly, efficient co-design requires fast simulation of hardware systems in order to vet proposed designs. Secondly, modern simulator platforms need to become increasingly concurrent as well. To address these challenges, we develop an optimistic time warp-based parallelization for the Structural Simulation Toolkit (SST). Our optimistic PDES engine hides synchronization costs by speculatively executing tasks, leading to better compute resource utilization on modern multicore architectures. Given the significant engineering effort to make custom existing hardware models reversible, we also develop a new SST component, called escher. The escher workflow instruments arbitrary SST applications and replays event traces through the different SST parallelizations. This is a useful tool for hardware engineers who want to understand the benefits of optimistic parallelization before undertaking the significant software engineering effort to make their hardware models reversible. We demonstrate this workflow by generating traces for a tiled mesh-NOC architecture and show a 2.1x to 3.7x speed-up using our optimistic SST parallelization versus the current conservative SST parallelization. © 2023 IEEE.

关键词： Network-on-chip

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A fast Electromagnetic Scattering Computation Method for Multiple Hybrid Targets 5

A fast Electromagnetic Scattering Computation Method for Mul...

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5th international Conference on Information Science, parallel and distributed systems, ISPDS 2024

作者： Song, Tao Wang, Qing-Kuan Cong, Li-Li Wang, Zhao-Long Air Force Engineering University Xi'an China

ISBN: (纸本)9798350352719

In modern local warfare, targets are often hybrid and grouped, so it is of great significance to investigate the electromagnetic scattering characteristics of multiple hybrid targets. In this paper, the hybrid dielectric and conductor target is analysed using both induced electric and magnetic currents in iterative calculations, with the introduction of the energy change rate. This enables the iterative calculations to be stopped when the change rate is lower than a set threshold value. In the case of multiple targets that do not satisfy the far-field conditions, the physical optics (PO) method is enhanced to render it suitable for near-area coupled scattering solving calculations. This is achieved by establishing a local coordinate system around the source point on the target surface and expanding the origin of the local coordinate system as the expansion point of the source point for the level expansion. The Green's function is then corrected, and the solution calculations for the integral equation of the scattering field are ultimately realised. Furthermore, in order to accelerate the computation, FaFFA is introduced in this paper, which reduces the computational complexity and memory consumption. The numerical results demonstrate a high degree of concordance between the results obtained through the near-field iterative PO method and those produced by the MLFMM solver in the commercial software FEKO. © 2024 IEEE.

关键词： Integral equations

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Optimal Design of the Planar Transformer Based on Its Multi-physics Field Coupling Characteristics 14

Optimal Design of the Planar Transformer Based on Its Multi-...

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14th IEEE international symposium on Power Electronics for distributed Generation systems, PEDG 2023

作者： Zheng, Yin Wu, Yujie Wang, Shishan Shen, Zhan Nanjing University of Aeronautics and Astronautics College of Automation Engineering Nanjing China Southeast University School of Electrical Engineering Nanjing China

ISBN: (纸本)9798350328233

Integration, high reliability and high power density have become the research hotspot of modern high-frequency power converter equipment. More and more research on planar transformers in order to improve the power density of electronic devices. Taking planar transformer as the research object, combined with its technical indicators. This paper is applied to the half-bridge LLC resonant converter system, based on multi-physics simulation and experiments, the design and optimization of planar transformers are realized. The design and optimization of high-frequency PCB planar transformers are taken as the research goal, a high-frequency equivalent model is established, and it is calculated in electromagnetic simulation software. The optimization is carried out from the two aspects of loss characteristics and structural parameters, which has certain reference significance for the design of PCB type planar transformers in similar high-frequency, low-voltage and high-current applications. © 2023 IEEE.

关键词： Polychlorinated biphenyls

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AcVerifier: Cross-Domain Access Control Verification via Hybrid Static and Dynamic Analysis 22

AcVerifier: Cross-Domain Access Control Verification via Hyb...

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22nd IEEE international symposium on parallel and distributed Processing with Applications, ISPA 2024

作者： Zhang, Jie He, Yuanyuan Hu, Miao Yu, Xinwei Guo, Tingting Gao, Xiangyu Ma, Jiaqi Huazhong University of Science and Technology School of Cyber Science and Engineering Wuhan China Wuhan Kedao Geographic Information Engineering Co. Wuhan China Wuhan Research Institute of Posts and Telecommunications Wuhan China

ISBN: (纸本)9798331509712

In today's interconnected world, as the scale of data sharing across diverse systems and organizations continues to grow, the secure and verifiable access to these data is of escalating importance. Nonetheless, existing verification methods for prevalent access control models, such as Role-Based Access Control (RBAC), usually face several prevalent challenges, including inadequate support for cross-domain operations, potential systemic risks stemming from potential flaws in policy design and improper implementation in large-scale complex systems, and concerns about modeling credibility. To address the issues, we propose AcVerifier, a novel solution that employs blockchain technology coupled with deterministic finite automaton (DFA) to enable verifiable enforcement of access control policies across disparate domains. AcVerifier uploads data indices and policies to a secure authorization server, which records operation logs in blockchain-connected data containers, thereby ensuring data credibility. AcVerifier employs a hybrid verification method combining static and dynamic analysis techniques, leveraging their respective strengths for preemptive auditing and real-time monitoring. Thus, AcVerifier can verify the correctness and consistency between the permissions granted by the extended access control policies and their actual execution in cross-domain data sharing and ubiquitous circulation scenarios. Here, the permissions encompass desensitization, access, modification and forwarding of personal information. Comprehensive evaluation demonstrates the correctness and efficiency of AcVerifier in addressing the challenges of cross-domain access control verification. © 2024 IEEE.

关键词： Large scale systems

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Suppression on Crosstalk Voltages of paralleled SiC MOSFETs with Optimized Gate Configurations and Additional SiC SBDs 14

Suppression on Crosstalk Voltages of Paralleled SiC MOSFETs ...

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14th IEEE international symposium on Power Electronics for distributed Generation systems, PEDG 2023

作者： Zhao, Cheng Wang, Laili Yang, Juhui Wu, Shijie Gan, Yongmei Cui, Hongchang Xi'an Jiaotong University School of Electrical Engineering Xi'an China

ISBN: (纸本)9798350328233

It is popular to parallel SiC MOSFETs for high-current applications. Compared with the single SiC MOSFET chip, the cross-turn-ON issues of paralleled SiC MOSFETs (PSMs) will be more complicated because of various mismatches in PSMs. This paper investigates the effects of all possible mismatches on the spurious gate-source voltages of PSMs (crosstalk voltages) by theoretical analysis and experiments. It is found that mismatched body diodes, asymmetric power-net layout and uneven junction temperature for PSMs can increase crosstalk voltages, leading to higher cross-turn-ON risk. Then the proportion of overall and separate gate resistance is adjusted and additional SiC Schottky Barrier diodes (SBDs) are employed to suppress crosstalk voltages of PSMs due to these mismatches. The effectiveness of both methods has be verified by experiments. © 2023 IEEE.

关键词： Junction temperature

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