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Active-matrix Addressed High Brightness and Ultra-high PPI Field-Sequential-Color Display based on Deformed Helix Ferroelectric Liquid Crystal for VR/AR

Active-matrix Addressed High Brightness and Ultra-high PPI F...

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International Conference on Display Technology, ICDT 2022

作者： Sun, Zhibo Wang, Sisi Yuan, Zhengnan Xia, Zhihe Lu, Lei Wong, Man Kwok, Hoi-Sing Srivastava, Abhishek Kumar State Key Laboratory of Advanced Displays and Optoelectronics Technologies Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Kowloon Hong Kong Electronic and Computer Engineering Peking University Shenzhen518055 China

Barriers exits regarding increasing brightness and pixel density for various display technologies, be it, LCD, LED and OLED. In this paper, we proposed a defect-free high-contrast fast (~100us) active-matrix addressed DHFLC with a theoretical 11500 PPI due to its nature of no fringe field effect (FFE) and high capacitance, shedding a light on the barriers. For the realization, the no-storage-capacitor AM-DHFLC display device is fabricated as preliminary demo with both optimizations in the DHFLC alignment and pixel design. Innovatively, the no-storage-capacitor characteristic, which is impossible for NLC, not only rockets efficiency and aperture ratio from 57% to 83% with high brightness, but also reveals the potential in reducing the pixel size for higher resolution. Moreover, fast response around 100 us at 360 Hz for FSC display and no-FFE strengthen the promising potential of DHFLC in various modern display technologies, be it VR/AR, high PPI display, micro display, and high-resolution hologram. © 2022, John Wiley and Sons Inc. All rights reserved.

关键词： Rockets

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LateBA: Latent Backdoor Attack on Deep Bug Search via Infrequent Execution Codes 15

LateBA: Latent Backdoor Attack on Deep Bug Search via Infreq...

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15th Asia-Pacific Symposium on Internetware, Internetware 2024

作者： Yi, Xiaoyu Li, Gaolei Huang, Wenkai Lin, Xi Li, Jianhua Liu, Yuchen The School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai Key Laboratory of Integrated Administration Technologies for Information Security Shanghai Shanghai China The Department of Computer Science North Carolina State University Raleigh United States

ISBN: (纸本)9798400707056

Backdoor attacks can mislead deep bug search models by exploring model-sensitive assembly code, which can change alerts to benign results and cause buggy binaries to enter production environments. But assembly instructions have strict constraints and dependencies, and these additional model-sensitive assembly codes destroy semantics and syntax and are easily detected by dynamic analysis or context-based detection. To escape from the dynamic analysis-based detection, we propose a novel latent backdoor attack (LateBA) scheme based on the locality principle of program execution, which only poisons a few of infrequent execution codes, minimizing the effects on the original code logic. In LateBA, a progressive seed mutating strategy is designated to change the American Fuzzy Lop (AFL)-based path search tool to pay more attention to infrequent execution codes. With this strategy, the optimal range to positions in the whole program is determined. Subsequently, triggers are target model-sensitive assembly instructions, and try to minimize the variables that have been called in the context instructions in the trigger. Finally, we employ code semantic feature comparisons to select precise trigger injection positions within these ranges. The selection criteria of the trigger injection position is whether the corresponding code segments in this position have a data dependency relationship with other code segments. We evaluate the performance of LateBA over 7 deep bug search tasks. The results demonstrate the attack success rate of the proposed LateBA is considerable and competitive against the baselines. © 2024 Owner/Author.

关键词： Semantics

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High brightness and ultra-high ppi field-sequential-color (Fsc) display based on deformed helix ferroelectric liquid crystal for vr/ar 59th

High brightness and ultra-high ppi field-sequential-color (F...

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59th International Symposium, Seminar and Exhibition, Display Week 2022

作者： Sun, Zhibo Wang, Sisi Yuan, Zhengnan Xia, Zhihe Lu, Lei Wong, Man Kwok, Hoi-Sing Srivastava, Abhishek Kumar State Key Laboratory of Advanced Displays and Optoelectronics Technologies Department of Electronics and Computer Engineering Hong Kong University of Science and Technology Kowloon Hong Kong Electronic and Computer Engineering Peking University Shenzhen518055 China

Different display-based technologies like LCD, OLED and LED, all meet barriers in increasing brightness and pixel density. In this paper, a defect-free high-contrast fast (~100 μs) active-matrix addressed DHFLC is proposed with a theoretical 11500 PPI due to its nature of no fringe field effect (FFE) and high capacitance, shedding a light on the barriers. For the realization, the no-storage-capacitor AM-DHFLC display device is fabricated as a preliminary demo with both optimizations in the DHFLC alignment and pixel design. Innovatively, the no-storage-capacitor characteristic, which is impossible for NLC, not only rockets efficiency and aperture ratio from 57 % to 83 % with high brightness, but also reveals the potential in reducing the pixel size for higher resolution. Moreover, a fast response around 100 μs at 360 Hz for FSC display and no-FFE strengthens the promising potential of DHFLC in various modern display technologies, be it VR/AR, high PPI display, microdisplay, and high-resolution hologram. © 2022. John Wiley and Sons Inc. AIAA. All rights reserved.

关键词： Rockets

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Dual Ferroelectric Liquid Crystal Polarization Converter for Fast (100 kHz) and Bi-stable Beam Steering Based on Pancharatnam-Berry Devices

Dual Ferroelectric Liquid Crystal Polarization Converter for...

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The 2023 International Conference on Display Technology, (ICDT 2023)

作者： Sun, Zhibo Tam, Alwin Yuan, Zhengnan Dong, Shoucheng Huo, Yipeng Chen, Rongsheng Yeung, Fion S. Y. Kwok, Hoi-Sing State Key Laboratory of Advanced Displays and Optoelectronics Technologies and Center for Display Research Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Road Kowloon Hong Kong

A high-efficiency (97%) fast polarization converter (100 kHz) is achieved using Ferroelectric Liquid Crystal (FLC). Innovatively, by cascading FLC cells, no diffraction and residual light loss are achieved. The flickering is less than 5%.. The contrast ratio is 1000:1. Bi-stable focus modulation is acheived. It is a promising candidate not just for display technologies, but also for high-efficiency beam-steering applications, such as Virtual Reality (VR)/Augmented Reality (AR), Light Ranging and Detection (LiDAR). © 2023, John Wiley and Sons Inc. All rights reserved.

关键词： Efficiency

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uTeBC-NLP at SemEval-2024 Task 9: Can LLMs be Lateral Thinkers?

arXiv

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arXiv 2024年

作者： Sadeghi, Pouya Abaskohi, Amirhossein Yaghoobzadeh, Yadollah Department of Electrical and Computer Engineering University of Tehran Iran Department of Computer Science University of British Columbia Canada Tehran Institute for Advanced Studies Khatam University Tehran Iran

Inspired by human cognition, Jiang et al. (2023c) create a benchmark for assessing LLMs' lateral thinking-thinking outside the box. Building upon this benchmark, we investigate how different prompting methods enhance LLMs' performance on this task to reveal their inherent power for outside-the-box thinking ability. Through participating in SemEval-2024, task 9, Sentence Puzzle sub-task, we explore prompt engineering methods: chain of thoughts (CoT) and direct prompting, enhancing with informative descriptions, and employing contextualizing prompts using a retrieval augmented generation (RAG) pipeline. Our experiments involve three LLMs including GPT-3.5, GPT-4, and Zephyr-7B-β. We generate a dataset of thinking paths between riddles and options using GPT-4, validated by humans for quality. Findings indicate that compressed informative prompts enhance performance. Dynamic in-context learning enhances model performance significantly. Furthermore, fine-tuning Zephyr on our dataset enhances performance across other commonsense datasets, underscoring the value of innovative thinking. © 2024, CC BY.

关键词： Benchmarking

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Review of Different Current Control Strategies for Thyristor-Controlled LC-Coupling Hybrid Active Power Filter 32

Review of Different Current Control Strategies for Thyristor...

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32nd IEEE International Symposium on Industrial Electronics, ISIE 2023

作者： Sou, Wai-Kit Chan, Pak-Ian Gong, Cheng Lam, Chi-Seng State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau China University of Macau Institute of Microelectronics China University of Macau Faculty of Science and Technology Department of Electrical and Computer Engineering China

ISBN: (纸本)9798350399714

With the characteristics of low DC-link voltage and wide operating range, thyristor-controlled LC-coupling hybrid active power filter (TCLC-HAPF) is a promising power quality compensator in the medium-voltage-level power system. This paper reviews the design and implementation of different current control strategies for the TCLC-HAPF, which are hysteresis current control (HCC), multi-quasi-proportional-resonant control (MQPRC), H∞ optimal control (HOC), finite-set model predictive control (FS-MPC), second-order sliding mode control (SOSMC) and deadbeat current control (DBCC). Also, their pros and cons are fully discussed. In order to provide a deeper understanding about the steady-state and transient performances of these control strategies, the simulation study is presented under both inductive and capacitive loads. © 2023 IEEE.

关键词： Thyristors

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Quantum Rod Color Filters with High Ambient Contrast Ratio

Quantum Rod Color Filters with High Ambient Contrast Ratio

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SID International Symposium Digest of Technical Papers, 2023

作者： Gao, Yiyang Prodanov, Maksym F. Kang, Chengbin Liao, Zebing Kumar, Mallem Song, Jianxin Vashchenko, Valerii V. Srivastava, Abhishek K. State Key Laboratory of Advanced Displays and Optoelectronics Technologies Centre for Display Research Electronics and Computer Engineering Department China IAS Center for Quantum Technologies The Hong Kong University of Science and Technology Hong Kong

Applying quantum dot (QDs)-based photoluminescent color filter arrays to mono-color OLED displays and liquid crystal displays is considered a promising method to broaden the color gamut and boost the brightness and efficiency of the display. However, the ambient light could excite the semiconductor QDs and QRs, decreasing the display ambient contrast ratio. Adding a traditional absorptive CF array has limited functions in solving this problem due to the broadband transmission band of pigments. With a larger Stokes shift, QRs are more suitable for suppressing photoluminescent reflection. In this article, we simulate the ambient contrast ratio of a QD/QR-OLED display, considering the parameters of backlight, the Stokes shift, the absorption strength, and spectral properties of QRs, QDs, and absorptive CFs, our discussion provides insight for optimization of the display ambient contrast ratio. © 2023, John Wiley and Sons Inc. All rights reserved.

关键词： Semiconductor quantum dots

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Attentive Hawkes Process Application for Sequential Recommendation 28th

Attentive Hawkes Process Application for Sequential Recomme...

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28th International Conference on Database Systems for advanced Applications, DASFAA 2023

作者： Yu, Shuodian Ma, Li Gao, Xiaofeng Guo, Jianxiong Chen, Guihai Shanghai Key Laboratory of Scalable Computing and Systems Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai China Advanced Institute of Natural Sciences Beijing Normal University Zhuhai519087 China

ISBN: (纸本)9783031306716

Sequential recommendation systems which aim to predict the users’ future clicking items are essential in both research and industry services. Based on the contextual characteristics of users, a large number of existing methods exploit abundant information from user behavior sequences and gain users’ interests through expressive sequential models like recurrent neural networks and self-attention mechanism to predict the next item. However, the temporal generative process of behavior sequences, which is crucial to the complex relationships and distributions of users’ dynamic preferences, is rarely considered. In this paper, we propose HawRec (Hawkes process based sequential recommendation), which is a new representation learning approach to model the interacted sequences of users from a temporal point process perspective. In particular, we leverage temporal self-attention mechanism to make an analogy to the self-exciting mechanism of Hawkes process. We bring expressive superiority of neural network into the Hawkes process with non-parametric conditional intensity kernel, resulting in more accurate recommendation and inheriting robustness from the temporal point process. Furthermore, extensive experiments conducted on four public benchmarks demonstrate that our HawRec outperforms various baselines of state-of-the-art sequential recommendation. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Recurrent neural networks

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Multi-Quasi-Proportional-Resonant Control for Capacitive-Coupling Grid-Connect Inverter (CGCI) with Accurate Active Power Injection Technique 49

Multi-Quasi-Proportional-Resonant Control for Capacitive-Cou...

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49th Annual Conference of the IEEE Industrial Electronics Society, IECON 2023

作者： Chan, Pak-Ian Sou, Wai-Kit Lam, Chi-Seng University of Macau State Key Laboratory of Analog and Mixed-Signal Vlsi China Institute of Microelectronics University of Macau China University of Macau Faculty of Science and Technology Department of Electrical and Computer Engineering China

ISBN: (纸本)9798350331820

In this paper, a multi-quasi-proportional-resonant control (MQPRC) for a three-phase capacitive-coupling grid-connect inverter (CGCI) with accurate active power injection technique is proposed to mitigate the current harmonics and improve the active power injection accuracy. Then, a detail parameter design of the proposed MQPRC is provided. And the proposed accurate active power injection is verified by the simulation. Subsequently, to verify the effectiveness of the proposed MQPRC, the simulation results are presented in comparison to the quasi-proportional-resonant control (QPRC). © 2023 IEEE.

关键词： Power quality

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Observation of merging mechanical bound states in the continuum in phononic crystals 15

Observation of merging mechanical bound states in the contin...

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Photonic and Phononic Properties of Engineered Nanostructures XV 2025

作者： Liu, Shengyan Tong, Hao Fang, Kejie Holonyak Micro and Nanotechnology Laboratory Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign UrbanaIL61801 United States Illinois Quantum Information Science and Technology Center University of Illinois Urbana-Champaign UrbanaIL61801 United States

ISBN: (纸本)9781510685024

Mechanical bound states in the continuum (BICs) have gradually become another popular method, aside from traditional band engineering, for obtaining mechanical resonators with high frequency and high quality factors. In our previous work, we demonstrated symmetry-protected mechanical BICs and coupled them with coexisting optical band-edge modes to achieve release-free optomechanical crystals. However, another important type of BIC — accidental BIC has never been realized in phononic systems. Here, we observe accidental BICs in a high-aspect-ratio gallium arsenide phononic crystal grating, their merging process with symmetry-protected BICs, and the subsequent enhancement of mechanical quality factors. This discovery provides a potential method for enhancing the performance of BIC based optomechanical crystals and can also be applied in fields such as sensing and quantum transduction. © 2025 SPIE.

关键词： Phonons

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