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11th IEEE Real-Time and Embedded Technology and Applications Symposium, RTAS 2005

作者： Lee, Jupyung Park, Kyu-Ho Computer Engineering Research Lab. EECS Korea Advanced Institute of Science and Technology Daejeon 305-701 Korea Republic of

In this paper, we propose a new technique, called a delayed locking technique, to improve the real-time performance of embedded Linux. The proposed technique employs the rule that entering a critical section is allowed only if the operation does not disturb the future execution of the real-time application. To execute this rule, we introduce the concepts of timer interrupt prediction and lock hold time acquisition. In addition, we designed and implemented a new high-resolution timer that is simple, yet efficient. We implemented the prototype on Linux 2.4.18. Experimental results show that the worst-case OS latency of real-time process is reduced to 23% of the original one, at the expense of slow-down of the non-real-time process by 20%. Though we focus only on embedded Linux, our technique is useful for all kinds of real-time operating systems in which the critical section is significantly long. © 2005 IEEE.

关键词： Real time systems

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Rectangular unfoldings of polycubes 31

Rectangular unfoldings of polycubes

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31st Canadian Conference on Computational Geometry, CCCG 2019

作者： Demaine, Martin L. Hearn, Robert Ku, Jason Uehara, Ryuhei Computer Science and Artificial Intelligence Lab MIT Electrical Engineering and Computer Science Department MIT Japan Advanced Institute of Science and Technology School of Information Science Japan

In this paper, we investigate the problem that asks if there exists a net of a polycube that is exactly a rectangle with slits. For this nontrivial question, we show affirmative solutions. First, we show some concrete examples: (1) no rectangle with slits with fewer than 24 squares can fold to any polycube, (2) a 4 × 7 rectangle with slits can fold to a heptacube (nonmanifold), (3) both of a 3 × 8 rectangle and a 4 × 6 rectangle can fold to a hexacube (nonmanifold), and (4) a 5 × 6 rectangle can fold to a heptacube (manifold). Second, we show a construction of infinite family of polycubes folded from a rectangle with slits. The smallest one given by this construction is a 6 × 20 rectangle with slits that can fold to a polycube of genus 5. This construction gives us a polycube for any positive genus. Moreover, by this construction, we can show that there exists a rectangle with slits that can fold to k different polycubes for any given positive integer k. © CCCG 2019. All rights reserved.

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Detection and Classification of Drones Through Acoustic Features Using a Spike-Based Reservoir computer for Low Power Applications 41

Detection and Classification of Drones Through Acoustic Feat...

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41st IEEE/AIAA Digital Avionics Systems Conference, DASC 2022

作者： Henderson, Alex Yakopcic, Chris Harbour, Steven Taha, Tarek M. Dayton Engineering Advanced Projects Lab Southwest Research Institute Beavercreek United States University of Dayton Department of Electrical and Computer Engineering Dayton United States

ISBN: (数字)9781665486071

ISBN: (纸本)9781665486071

Over the past few decades, the use of drones for applications such as defense, reconnaissance, agriculture, law enforcement, and others has dramatically increased. Although drones are useful for these applications, they can also be utilized to perform malicious activities, thus compromising the safety and integrity of physical infrastructures. To address this issue, various techniques have been developed to detect and identify drones, including radar, visual analysis, and radio-frequency signal processing. Furthermore, deep learning algorithms based on the recognition of acoustic drone features have been proposed to automate the detection process and overcome the current limitations in modern drone detection systems. This paper presents an auditory drone detection and identification system based on the sparse, event-driven communication nature of Spiking Neural Networks (SNNs). We investigate the use of a spiking reservoir computing model, known as a Liquid State Machine (LSM), that offers a computationally light alternative to the deep learning approaches of previous works. The LSM based auditory drone detection and identification system is demonstrated on a publicly available acoustic drone dataset, achieving an accuracy of 97.13% and 93.25% on the detection and identification tasks, respectively. To the best of our knowledge, this work presents the first spike-based implementation of an auditory drone recognition system. Moreover, this paper highlights the potential for low size, weight, and power neuromorphic hardware deployment for drone applications that may be limited to energy-constrained environments. © 2022 IEEE.

关键词： Drones

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Conditional Generative Modeling for Amorphous Multi-Element Materials

arXiv

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arXiv 2025年

作者： Li, Honglin Liu, Chuhao Guo, Yongfeng Luo, Xiaoshan Chen, Yijie Liu, Guangsheng Li, Yu Wang, Ruoyu Wang, Zhenyu Wu, Jianzhuo Ma, Cheng Xie, Zhuohang Lv, Jian Ding, Yufei Zhang, Huabin Luo, Jian Zhong, Zhicheng Li, Mufan Wang, Yanchao Li, Wan-Lu Key Laboratory of Material Simulation Methods and Software Ministry of Education College of Physics Jilin University Changchun China Aiiso Yufeng Li Family Department of Chemical and Nano Engineering University of California La Jolla San DiegoCA United States Institute of Molecular Engineering Plus College of Chemistry Fuzhou University Fuzhou China College of Chemistry and Molecular Engineering Peking University Beijing China School of Physics Nankai University Tianjin China Institute of Modern Physics Fudan University Shanghai China Program in Materials Science and Engineering University of California La Jolla San DiegoCA United States School of Artificial Intelligence and Data Science University of Science and Technology of China Hefei230026 China Suzhou Institute for Advanced Research University of Science and Technology of China Suzhou215123 China International Center of Future Science Jilin University Changchun China Department of Computer Science and Engineering University of California La Jolla San DiegoCA United States Center for Renewable Energy and Storage Technologies Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal Saudi Arabia Suzhou Lab Suzhou215123 China

Amorphous multi-element materials offer unprecedented tunability in composition and properties, yet their rational design remains challenging due to the lack of predictive structure-property relationships and the vast configurational space. Traditional modeling struggles to capture the intricate short-range order that dictates their stability and functionality. We here introduce ApolloX, a pioneering predictive framework for amorphous multi-element materials, establishing a new paradigm by integrating physics-informed generative modeling with particle swarm optimization, using chemical short-range order as an explicit constraint. By systematically navigating the disordered energy landscape, ApolloX enables the targeted design of thermodynamically stable amorphous configurations. It accurately predicts atomic-scale arrangements, including composition-driven metal clustering and amorphization trends, which are well-validated by experiments, while also guiding synthesis by leveraging sluggish diffusion to control elemental distribution and disorder. The resulting structural evolution, governed by composition, directly impacts catalytic performance, leading to improved activity and stability with increasing amorphization. This predictive-experimental synergy transforms the discovery of amorphous materials, unlocking new frontiers in catalysis, energy storage, and functional disordered systems. Copyright © 2025, The Authors. All rights reserved.

关键词： Amorphization

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Ultra-thin variable transmission smart window by one-step patterned photoalignment

Ultra-thin variable transmission smart window by one-step pa...

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SID Symposium, Seminar, and Exhibition 2018, Display Week 2018

作者： Pan, Su Meng, Cuiling Tseng, Man Chun Tang, Shu Tuen Kwok, Hoi Sing State Key Lab on Advanced Displays and Optoelectronics Department of Electronic and Computer Engineering Hong Kong University of Science & Technology Hong Kong

Smart windows are attractive because of their numerous advantages such as elegance in construction design and energy conservation. Smart windows with variable transmission are especially desirable for obvious reasons. The simplest way to make a variable transmission smart window is to use two patterned polarizers, and control the transmission by changing the relative position of the two polarizers. We have demonstrated a high-dichroic-ratio polarizer by photoalignment and proposed a simple one-step photo-copy method to realize a continuous axis varying polarizer. The patterned polarizer shows high optical performance, and its thickness is as thin as 100 nm, which is favorable in practical window applications. © 2018, Blackwell Publishing Ltd. All rights reserved.

关键词： Optical instruments

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Ultra-thin Broadband Thin Film Polarizers by Photoalignment

Ultra-thin Broadband Thin Film Polarizers by Photoalignment

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International Conference on Display Technology, ICDT 2018

作者： Pan, Su Ho, Jacob Y. Kwok, Hoi-Sing State Key Lab on Advanced Displays and Optoelectronics Department of Electronic and Computer Engineering Hong Kong University of Science & Technology Hong Kong

ISBN: (纸本)9781510867659

Ultra-thin broadband polarizers with high performance are urgently demanded as the prosperous development of ultra-thin and flexible displays. We have realized high-dichroic-ratio AD-1 polarizers by the photoalignment technique, and its functional band is in the blue region. To obtain a broadband polarizer in the whole visible region, a simple additional iodine doping process is investigated. We also compare the final broadband polarizers by doping the iodine in both the atmosphere and vacuum. Moreover, by in situ exposure of polarized light during the doping process, the maximum dichroic ratio is improved to 29, which is satisfactory for the ultra-thin and flexible OLED displays. Therefore, a simple and economical technique is offered to realize advanced displays with low cost, ultra-thin profile, flexible style, and high performance. © 2018 SID.

关键词： Iodine

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Ultra-thin high-dichroic-ratio polarizer generated by photoalignment 54

Ultra-thin high-dichroic-ratio polarizer generated by photoa...

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54th Annual SID Symposium, Seminar, and Exhibition 2016, Display Week 2016

作者： Pan, Su Ho, Jacob Y. Chigrinov, Vladimir G. Kwok, Hoi-Sing State Key Lab on Advanced Displays and Optoelectronics Department of Electronic and Computer Engineering Hong Kong University of Science & Technology Hong Kong

ISBN: (纸本)9781510832909

A dichroic polarizer with a high dichroic ratio of up to 60 is achieved by photoalignment induced anisotropic azo dye ordering. The film thickness is well controlled in 200 nm, and it is 500 times thinner than a conventional iodine Polaroid polarizer, which is desirable for ultra-thin high performance liquid crystal display applications. © 2016, Blackwell Publishing Ltd. All rights reserved.

关键词： Azo dyes

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Efficient zero-copy mechanism for intelligent video surveillance networks 2

Efficient zero-copy mechanism for intelligent video surveill...

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2nd International Conference on Material engineering and advanced Manufacturing Technology, MEAMT 2018

作者： Chen, Shiyan Li, Dagang School of Electronic and Computer Engineering Peking University China Shenzhen Key Lab of Advanced Electron Device and Integration ECE PKUSZ China

Most of today's intelligent video surveillance systems are based on Linux core and rely on the kernel's socket mechanism for data transportation. In this paper, we propose APRO, a novel framework with optimized zero-copy capability customized for video surveillance networks. Without the help of special hardware support such as RNIC or NetFPGA, the software-based APRO can effectively reduce the CPU overhead and decrease the transmission latency, both of which are much appreciated for resource-limited video surveillance networks. Furthermore, unlike other software-based zero-copy mechanisms, in APRO zero-copied data from network packets are already reassembled and page aligned for user-spac applications to utilize, which makes it a 'true' zero-copy solution for localhost applications. The proposed mechanism is compared with standard TCP and netmap, a typical zero-copy framework. Simulation results show that APRO outperforms both TCP and localhost optimized netmap implementation with the smallest transmission delay and lowest CPU consumption. © 2018 The Authors, published by EDP Sciences.

关键词： Monitoring

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Random beamforming in MIMO systems exploiting efficient multiuser diversity

Random beamforming in MIMO systems exploiting efficient mult...

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2005 IEEE 61st Vehicular Technology Conference -VTC 2005 - Spring Stockholm: Paving the Path for a Wireless Future

作者： Kim, Eun Yong Chun, Joohwan Scientific Computing Lab. Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon Korea Republic of

We propose a new random beamforming technique in forward link multiuser MIMO systems that exploits efficient multiuser diversity and spatial multiplexing gain. The common channels are allocated to more than one user simultaneously and multiple antennas at the receivers are used for interference nulling, resulting in higher throughput and reduced average waiting time. We show that the throughput of the proposed scheme outperforms the upper bound of the conventional scheme. © 2005 IEEE.

关键词： Communication channels (information theory)

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A mapping simulation of code generation for partitioned system

A mapping simulation of code generation for partitioned syst...

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2013 2nd International Conference on Manufacturing engineering and Process, ICMEP 2013

作者： Chen, Ya Qin Ma, Dian Fu Wang, Ying Zhao, Xian Qi National Lab of Software Development Environment Institute of Advanced Computing Technology School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9783037857076

It is crucial for real-time embedded system to design and verify for a little fault may lead to a catastrophe. Architecture Analysis and Design Language (AADL) is a modeling language used to design and analysis the architecture of real-time embedded system based on Model Driven Architecture (MDA). Code generation of AADL model to codes running on the Real-time Operation System can avoid hand-writing mistakes and improve the efficiency of development. Partitioning is introduced into embedded system to control fault transmission. This paper presents a mapping approach to generate codes from AADL model for partitioned system, and the generated codes which include configuration codes and C codes will run on a partitioned platform. © (2013) Trans Tech Publications, Switzerland.

关键词： Mapping

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