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9th International Symposium on Computing and Networking Workshops, CANDARW 2021

作者： Hirabayashi, Riku Fortes, Jose A. B. Yamaguchi, Saneyasu Electrical Engineering And Electronics Kogakuin University Graduate School Tokyo Japan Lab Department of ECE Gainesville United States Kogakuin University Department of Information And Communications Engineering Tokyo Japan

ISBN: (纸本)9781665428354

Non-volatile memory has become an essential type of persistent storage. Utilizing an SSD (Solid-State Drive) as a cache device for an HDD (Hard-Disk Drive) is one of the effective ways to achieve both good storage-access performance and large capacity. This combination of these two types of storage can be implemented by using dm-cache, a popular block-level storage cache system in Linux. In this paper, we focus on this implementation and discuss an approach to improve its performance. First, we analyze it experimentally, using HDD, SSD, and 3D XPoint Optane memory, and show that dm-cache has room for performance improvement. Second, we propose a modified implementation that enables control of the aggressiveness of the cache replacement policy. Finally, we evaluate the modified dm-cache and show that, in several cases, it significantly improves IO performance. © 2021 IEEE.

关键词： Hard disk storage

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AV Navigation in 3D Urban Environments with Curriculum-based Deep Reinforcement Learning

AV Navigation in 3D Urban Environments with Curriculum-based...

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International Conference on Unmanned Aircraft Systems (ICUAS)

作者： Kevin Braathen de Carvalho Iure Rosa L. de Oliveira Alexandre S. Brandão Department of Electrical Engineering Graduate Program in Computer Science Nucleus of Specialization in Robotics Universidade Federal de Viçosa Viçosa MG Brazil Department of Electrical Engineering Federal University of Viçosa Viçosa MG Brazil

Unmanned Aerial Vehicles (UAVs) are widely used in various applications, from inspection and surveillance to transportation and delivery. Navigating UAVs in complex 3D environments is a challenging task that requires robust and efficient decision-making algorithms. This paper presents a novel approach to UAV navigation in 3D environments using a Curriculum-based Deep Reinforcement Learning (DRL) approach. The proposed method utilizes a deep neural network to model the UAV’s decision-making process and to learn a mapping from the state space to the action space. The learning process is guided by a reinforcement signal that reflects the performance of the UAV in terms of reaching its target while avoiding obstacles and with energy efficiency. Simulation results show that the proposed method has a positive trade off when compared to the baseline algorithm. The proposed method was able to perform well in environments with a state space size of 22 millions, allowing the usage in big environments or in maps with high resolution. The results demonstrate the potential of DRL for enabling UAVs to operate effectively in complex environments.

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Van der Waals device integration beyond the limits of van der Waals forces using adhesive matrix transfer

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Nature electronics 2024年第1期7卷 17-28页

作者： Satterthwaite, Peter F. Zhu, Weikun Jastrzebska-Perfect, Patricia Tang, Melbourne Spector, Sarah O. Gao, Hongze Kitadai, Hikari Lu, Ang-Yu Tan, Qishuo Tang, Shin-Yi Chueh, Yu-Lun Kuo, Chia-Nung Lue, Chin Shan Kong, Jing Ling, Xi Niroui, Farnaz Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA United States Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA United States Department of Chemical Engineering Massachusetts Institute of Technology CambridgeMA United States Department of Physics Massachusetts Institute of Technology CambridgeMA United States Department of Chemistry Boston University BostonMA United States Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan Semiconductor Research Center Hon Hai Research Institute Taipei Taiwan College of Semiconductor Research National Tsing Hua University Hsinchu Taiwan Department of Physics National Cheng Kung University Tainan Taiwan Taiwan Consortium of Emergent Crystalline Materials National Science and Technology Council Taipei Taiwan Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan Taiwan Division of Materials Science and Engineering Boston University BostonMA United States The Photonics Center Boston University BostonMA United States

Pristine van der Waals (vdW) heterostructures formed between two-dimensional (2D) and other materials can be used to create optical and electronic devices. However, the weak vdW forces alone do not allow direct physical stacking of arbitrary layers. As a result, vdW heterostructure fabrication typically requires solvents, sacrificial layers or high temperatures, which can introduce damage and contaminants. Here, we show that adhesive matrix transfer can eliminate these limitations and can provide vdW integration beyond the limits of vdW forces. In the approach, a hybrid high- and low-adhesion surface is used to decouple the forces driving the transfer from the vdW forces defining the heterostructure of interest. We show that the technique can be used to achieve direct vdW integration of diverse 2D materials (MoS2, WSe2, PtS2 and GaS) with dielectrics (SiO2 and Al2O3), which is conventionally forbidden but critical for active devices and scalable, aligned heterostructure formation. The approach also allows single-step 2D material-to-device integration, which we illustrate by fabricating arrays of monolayer MoS2 transistors. As any exposure to solvents or polymers is avoided, the interfaces and surfaces remain pristine. Thus, intrinsic 2D material properties can be probed without the influence of processing steps. The materials can be further engineered through surface treatments and used to fabricate unconventional device form factors. © 2023, The Author(s), under exclusive licence to Springer Nature Limited.

关键词： Van der Waals forces

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Multi-band Chirped Mirror Design for Highly Dispersive Optical Systems

Multi-band Chirped Mirror Design for Highly Dispersive Optic...

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Chia, Shih-Hsuan Li, Yan-Cheng Sun, Chi-Kuang Kärtner, Franz X. Institute of Biophotonics National Yang Ming Chiao Tung University Taipei112304 Taiwan Graduate Institute of Photonics and Optoelectronics Department of Electrical Engineering National Taiwan University Taipei10617 Taiwan Molecular Imaging Center Graduate Institute of Biomedical Electronics and Bioinformatics National Taiwan University Taipei10617 Taiwan Department of Physics University of Hamburg Notkestraße 85 Hamburg22607 Germany The Hamburg Center for Ultrafast Imaging Luruper Chaussee 149 Hamburg22761 Germany

We present multi-band chirped mirror pairs, adept at managing group delay variations within and across bands. These designs outperform ultra-broadband mirrors, offering enhanced dispersion control and facilitating pre... 详细信息

关键词： Group delay

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RVSL: Robust Vehicle Similarity Learning in Real Hazy Scenes Based on Semi-supervised Learning

arXiv

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arXiv 2022年

作者： Chen, Wei-Ting Chen, I-Hsiang Yeh, Chih-Yuan Yang, Hao-Hsiang Chang, Hua-En Ding, Jian-Jiun Kuo, Sy-Yen Graduate Institute of Electronics Engineering National Taiwan University Taiwan Department of Electrical Engineering National Taiwan University Taiwan

Recently, vehicle similarity learning, also called re-identification (ReID), has attracted significant attention in computer vision. Several algorithms have been developed and obtained considerable success. However, most existing methods have unpleasant performance in the hazy scenario due to poor visibility. Though some strategies are possible to resolve this problem, they still have room to be improved due to the limited performance in real-world scenarios and the lack of real-world clear ground truth. Thus, to resolve this problem, inspired by CycleGAN, we construct a training paradigm called RVSL which integrates ReID and domain transformation techniques. The network is trained on semi-supervised fashion and does not require to employ the ID labels and the corresponding clear ground truths to learn hazy vehicle ReID mission in the real-world haze scenes. To further constrain the unsupervised learning process effectively, several losses are developed. Experimental results on synthetic and real-world datasets indicate that the proposed method can achieve state-of-the-art performance on hazy vehicle ReID problems. It is worth mentioning that although the proposed method is trained without real-world label information, it can achieve competitive performance compared to existing supervised methods trained on complete label information. Copyright © 2022, The Authors. All rights reserved.

关键词： Vehicles

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Implementation of IP Multicast Network Specific Attacks on GNS3

Implementation of IP Multicast Network Specific Attacks on G...

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Information Security and Cryptology (ISCTURKEY), International Conference on

作者： Göksel Uçtu Mustafa Alkan Department of Information Security Engineering Graduate School of Natural and Applied Sciences Gazi University Ankara Türkiye Department of Electrical and Electronics Engineering Technology Faculty Gazi University Ankara Türkiye

Multicast networks, while efficient in data transmission, are susceptible to targeted attacks. Leveraging GNS3’s capabilities, this study emulates and analyzes three types of multicast attacks: fake rendezvous point attack, IGMP flood, and IGMP Leave attacks. Through realistic emulation performed via GNS3, the research sheds light on attack implementation. The results offer insights into investigating multicast vulnerabilities, benefiting security practitioners and researchers alike. This work enhances understanding of multicast network attacks, presenting a practical approach to evaluating and investigating against potential threats.

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Subgraph matching-based reference placement for printed circuit board designs

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The Journal of Supercomputing 2024年第16期80卷 24324-24357页

作者： Zhu, Ziran Li, Yilin Su, Miaodi Zhang, Shu Su, Haiyuan Xiao, Yifeng He, Huan Chen, Jianli Chang, Yao-Wen National ASIC System Engineering Center Southeast University Nanjing China College of Mathematics and Computer Science Fuzhou University Fuzhou China Department of Electrical Engineering University of Southern California Los Angeles USA Hangzhou Huawei Enterprises Telecommunication Technologies Co. Ltd Hangzhou China State Key Lab of ASIC and System Fudan University Shanghai China Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan

Reference placement is promising to handle the increasing complexity in printed circuit board (PCB) designs, which aims to find the isomorphism of the placed template in component combination to reuse the placement. In this paper, we convert the netlist information into a graph and then model the reference placement as a subgraph matching problem. Since the state-of-the-art subgraph matching methods usually recursively search the solutions and suffer from high time and memory consumption in large-scale designs, we develop a novel subgraph matching algorithm D2BS with diversity tolerance and improved backtracking to guarantee matching quality and efficiency. The D2BS algorithm is founded on a data structure called the candidate space (CS) structure. We build and filter the candidate set for each query node according to our designed features to construct the CS structure. During the CS optimization process, a graph diversity tolerance strategy is adopted to achieve efficient inexact matching. Then, hierarchical matching is developed to search the template embeddings in the CS structure guided by branch backtracking and matched-node snatching strategies. Based on the industrial PCB designs, experimental results show that D2BS outperforms the state-of-the-art subgraph matching method in matching accuracy and running time.

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Multi-band Chirped Mirror Design for Highly Dispersive Optical Systems

Multi-band Chirped Mirror Design for Highly Dispersive Optic...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Chia, Shih-Hsuan Li, Yan-Cheng Sun, Chi-Kuang Kärtner, Franz X. Institute of Biophotonics National Yang Ming Chiao Tung University Taipei112304 Taiwan Graduate Institute of Photonics and Optoelectronics Department of Electrical Engineering National Taiwan University Taipei10617 Taiwan Molecular Imaging Center Graduate Institute of Biomedical Electronics and Bioinformatics National Taiwan University Taipei10617 Taiwan Germany Department of Physics University of Hamburg Notkestraße 85 Hamburg22607 Germany The Hamburg Center for Ultrafast Imaging Luruper Chaussee 149 Hamburg22761 Germany

ISBN: (纸本)9781957171395

关键词： Group delay

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SliQSim: A Quantum Circuit Simulator and Solver for Probability and Statistics Queries 31th

SliQSim: A Quantum Circuit Simulator and Solver for Probabil...

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31st International Conference on Tools and Algorithms for the Construction and Analysis of Systems, TACAS 2025, which was held as part of the International Joint Conferences on Theory and Practice of Software, ETAPS 2025

作者： Chen, Tian-Fu Jiang, Jie-Hong R. Graduate School of Advanced Technology National Taiwan University Taipei Taiwan Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan Department of Electrical Engineering National Taiwan University Taipei Taiwan Center for Quantum Science and Engineering National Taiwan University Taipei Taiwan Physics Division National Center for Theoretical Sciences Taipei Taiwan

ISBN: (纸本)9783031906596

SliQSim, originally developed as the first exact quantum circuit simulator, is extended in this paper to provide capabilities for the analysis and verification of quantum states. It provides an interface for users to specify interested quantum states for querying the exact probability or expectation value of a user-defined property. Case studies on three quantum algorithms show the unique capability of SliQSim benefiting exact quantum circuit analysis and verification, beyond the support by other tools. © The Author(s) 2025.

关键词： Quantum electronics

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Stabilization of a two-dimensional quantum electron solid in perpendicular magnetic fields

arXiv

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arXiv 2024年

作者： Melnikov, M.Yu. Smirnov, D.G. Shashkin, A.A. Huang, S.-H. Liu, C.W. Kravchenko, S.V. Institute of Solid State Physics Moscow District Chernogolovka142432 Russia Department of Electrical Engineering Graduate Institute of Electronics Engineering National Taiwan University Taipei106 Taiwan Physics Department Northeastern University BostonMA02115 United States

We find that the double-threshold voltage-current characteristics in the insulating regime in the ultra-clean two-valley two-dimensional electron system in SiGe/Si/SiGe quantum wells are promoted by perpendicular magnetic fields, persisting to an order of magnitude lower voltages and considerably higher electron densities compared to the zero-field case. This observation indicates the perpendicular-magnetic-field stabilization of the quantum electron solid. © 2024, CC BY.

关键词： Threshold voltage

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