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arXiv 2022年

作者： Álvarez Ballesteros, Miguel Ángel Chada, Neil K. Jasra, Ajay Applied Mathematics and Computational Science Program Computer Electrical and Mathematical Sciences and Engineering Division King Abdullah University of Science and Technology Thuwal23955 Saudi Arabia

In this article we consider the development of an unbiased estimator for the ensemble Kalman–Bucy filter (EnKBF). The EnKBF is a continuous-time filtering methodology which can be viewed as a continuous-time analogue of the famous discrete-time ensemble Kalman filter. Our unbiased estimators will be motivated from recent work [Rhee & Glynn 2010, [31]] which introduces randomization as a means to produce unbiased and finite variance estimators. The randomization enters through both the level of discretization, and through the number of samples at each level. Our estimator will be specific to linear and Gaussian settings, where we know that the EnKBF is consistent, in the particle limit N → ∞, with the KBF. We highlight this for two particular variants of the EnKBF, i.e. the deterministic and vanilla variants, and demonstrate this on a linear Ornstein–Uhlenbeck process. We compare this with the EnKBF and the multilevel (MLEnKBF), for experiments with varying dimension size. We also provide a proof of the multilevel deterministic EnKBF, which provides a guideline for some of the unbiased methods. © 2022, CC BY-NC-SA.

关键词： Continuous time systems

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Wireless,multimodal sensors for continuous measurement of pressure,temperature,and hydration of patients in wheelchair

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npj Flexible Electronics 2023年第1期7卷 479-493页

作者： Seokjoo Cho Hyeonseok Han Hyunwoo Park Sung-Uk Lee Jae-Hwan Kim Sung Woo Jeon Mengqiu Wang Raudel Avila Zhaoqian Xi Kabseok Ko Minsu Park Jungyup Lee Myungwoo Choi Je-Sang Lee Weon Gi Min Byeong-Ju Lee Soyeong Lee Jungrak Choi Jimin Gu Jaeho Park Min Seong Kim Junseong Ahn Osman Gul Chankyu Han Gihun Lee Seunghwan Kim Kyuyoung Kim Jeonghyun Kim Chang-Mo Kang Jahyun Koo Sung Soo Kwak Sungbong Kim Dong Yun Choi Seokwoo Jeon Hyung Jin Sung Yong Bae Park Minkyu Je Young Tae Cho Yong Suk Oh Inkyu Park Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea School of Electrical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Advanced 3D Printing Technology Development Division Korea Atomic Energy Research InstituteDaejeon 34057Republic of Korea Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian 116023P.R.China Department of Mechanical Engineering Northwestern UniversityEvanstonIL 60208USA DUT-BSU Joint Institute Dalian University of TechnologyDalian 116023China Ningbo Institute of Dalian University of Technology Ningbo 315016China Department of Electronics Engineering Kangwon National UniversityChuncheon 24341Republic of Korea Querrey-Simpson Institute for Bioelectronics Northwestern UniversityEvanstonIL 60208USA Sibel Health Inc NilesIL 60714USA Department of Materials Science and Engineering KAIST Institute for The Nanocentury(KINC)Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Department of Rehabilitation Medicine Gimhae Hansol Rehabilitation&Convalescent HospitalGimhae 50924Republic of Korea Department of planning and development Gimhae Hansol Rehabilitation&Convalescent HospitalGimhae 50924Republic of Korea Department of rehabilitation medicine Pusan national university hospitalBusan 49241Republic of Korea Department of AI Convergence Network Ajou UniversitySuwon 16499Republic of Korea Department of Electronic Convergence Engineering Kwangwoon UniversitySeoul 01897Republic of Korea Korea Photonics Technology Institute Gwangju 61007Republic of Korea School of Biomedical Engineering Korea UniversitySeoul 02841Republic of Korea Interdisciplinary Program in Precision Public Health Korea UniversitySeoul 02841Republic of Korea Center

Individuals who are unable to walk independently spend most of the day in a *** population is at high risk for developing pressure injuries caused by ***,early diagnosis and prevention of these injuries still remain ***,we introduce battery-free,wireless,multimodal sensors and a movable system for continuous measurement of pressure,temperature,and hydration at skin *** device design includes a crack-activated pressure sensor with nanoscale encapsulations for enhanced sensitivity,a temperature sensor for measuring skin temperature,and a galvanic skin response sensor for measuring skin hydration *** movable system enables power harvesting,and data communication to multiple wireless devices mounted at skin-cushion interfaces of wheelchair users over full body *** evaluations and numerical simulations of the devices,together with clinical trials for wheelchair patients,demonstrate the feasibility and stability of the sensor system for preventing pressure injuries caused by sitting.

关键词： injuries modal mounted

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Reverse-Bias Resilience of Monolithic Perovskite/Silicon Tandem Solar Cells

Reverse-Bias Resilience of Monolithic Perovskite/Silicon Tan...

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IEEE Conference Photovoltaic Specialists (PVSC)

作者： Zhaojian Xu Helen Bristow Maxime Babics Badri Vishal Erkan Aydin Randi Azmi Esma Ugur Bumin K. Yildirim Jiang Liu Ross A. Kerner Stefaan De Wolf Barry P. Rand Department of Electrical and Computer Engineering Princeton University Princeton NJ USA Physical Science and Engineering Division (PSE) KAUST Solar Center (KSC) King Abdullah University of Science and Technology (KAUST) Thuwal Kingdom of Saudi Arabia National Renewable Energy Laboratory Chemistry and Nanoscience Center Golden CO USA Andlinger Center for Energy and the Environment Princeton University Princeton NJ USA

ISBN: (数字)9781665464260

ISBN: (纸本)9781665475822

Metal halide perovskites have rapidly enabled a range of high-performance photovoltaic technologies. However, catastrophic failure under reverse voltage bias hinders their commercialization. In this work, we demonstrate that by employing a monolithic perovskite/silicon tandem structure, the perovskite subcell can be effectively protected by the silicon subcell under reverse bias, owing to the low reverse-bias diode current of the silicon subcell. As a result, the tested perovskite/silicon tandem devices show superior reverse-bias resilience compared to perovskite single-junction devices in both long-term reverse voltage biasing tests at the single-cell level and partial shading tests at the module level. These results highlight that, compared to other perovskite technologies, monolithic perovskite/silicon tandems are at a higher technology readiness level in terms of tackling the reverse-bias and partial shading challenge, which is a considerable advantage towards commercialization.

关键词： Photovoltaic systems Photovoltaic cells Metals Voltage Perovskites Silicon Commercialization Resilience

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Measurement of Water Diffusion Coefficient in Cross-Linked Gelatins Using the Terahertz Time-Domain Spectroscopy Technique

Measurement of Water Diffusion Coefficient in Cross-Linked G...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Walden, D. Chakraborty, D. Cheng, J. Straksys, A. Stirke, A. Melo, W.C.M.A. Jukna, A. Komissarov, I. Sobolewski, Roman Department of Physics and Astronomy University of Rochester RochesterNY14627 United States Laboratory for Laser Energetics University of Rochester RochesterNY14623-1299 United States Materials Science Graduate Program University of Rochester RochesterNY14627 United States State Research Institute Center for Physical Sciences & Technology Vilnius Lithuania Department of Physics Vilnius Gediminas Technical University Vilnius Lithuania Department of Electrical and Computer Engineering University of Rochester RochesterNY14627 United States

A novel method has been developed to evaluate the water diffusion dynamics in gelatin-based gels, based on transient terahertz time-domain spectroscopy measurements. Such gels are widely used models for human skin. &#... 详细信息

ISBN: (纸本)9781957171395

关键词： Transient analysis

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DELE: Deductive EL++ Embeddings for Knowledge Base Completion

arXiv

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arXiv 2024年

作者： Mashkova, Olga Zhapa-Camacho, Fernando Hoehndorf, Robert Computer Science Program Computer Electrical and Mathematical Sciences & Engineering Division King Abdullah University of Science and Technology Thuwal Saudi Arabia Center of Excellence for Smart Health King Abdullah University of Science and Technology Thuwal Saudi Arabia Center of Excellence for Generative AI King Abdullah University of Science and Technology Thuwal Saudi Arabia

Ontology embeddings map classes, relations, and individuals in ontologies into Rn, and within Rn similarity between entities can be computed or new axioms inferred. For ontologies in the Description Logic EL++, several embedding methods have been developed that explicitly generate models of an ontology. However, these methods suffer from some limitations;they do not distinguish between statements that are unprovable and provably false, and therefore they may use entailed statements as negatives. Furthermore, they do not utilize the deductive closure of an ontology to identify statements that are inferred but not asserted. We evaluated a set of embedding methods for EL++ ontologies, incorporating several modifications that aim to make use of the ontology deductive closure. In particular, we designed novel negative losses that account both for the deductive closure and different types of negatives and formulated evaluation methods for knowledge base completion. We demonstrate that our embedding methods improve over the baseline ontology embedding in the task of knowledge base or ontology completion. © 2024, CC BY.

关键词： Ontology

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Dynamic Fire and Smoke Detection Module with Enhanced Feature Integration and Attention Mechanisms

SSRN

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SSRN 2024年

作者： Amjad, Ammar Tsung, Chang Hsien Tai, Li-Chia Department of Electrical and Computer Engineering National Yang Ming Chiao Tung University Hsinchu300 Taiwan Department of Computer Science and Information Engineering Chang Gung Universiry Taoyuan333 Taiwan Bachelor Program in Artificial Intelligence Chang Gung Universiry Taoyuan333 Taiwan Department of Physical Medicine and Rehabilitation at Linkou Taoyuan333 Taiwan

Essential components of early fire warning systems include effective fire and smoke detection mechanisms. Despite object detection-based technologies demonstrating promising results, the unique characteristics of fire and smoke, the complexity of fire environments, the scarcity of labeled datasets, and the presence of noise in images necessitate further improvements. We have developed a YOLOv7-tiny optimized architecture called the Dynamic Fire and Smoke Detection Module (DFDM) to address these challenges. Our approach includes an asymptotic feature pyramid network (AFPN) to bridge semantic gaps, thus enhancing fire detection capabilities in complex environments. A cross-level dual attention mechanism also refines critical smoke and fire detection features. To enhance performance while reducing model complexity, we introduced a novel partial convolution module designed to filter out extraneous information effectively. Experimental results demonstrate that DFDM provides robust fire and smoke detection capabilities, giving it a competitive advantage over more complex systems. Extensive visualization studies confirm DFDM's effectiveness in object recognition across varied settings. © 2024, The Authors. All rights reserved.

关键词： Smoke

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Gate Stack engineering in n-type (−201) $\upbeta-\text{Ga}_{2}\mathrm{O}_{3}$ Transistors

Gate Stack Engineering in n-type (−201) $\upbeta-\text{Ga}_...

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International Conference on Emerging Electronics (ICEE)

作者： Vishal Khandelwal Saravanan Yuvaraja Chuanju Wang Dhanu Chettri Xiaohang Li Advanced Semiconductor Laboratory Electrical and Computer Engineering Program CEMSE division King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia

A systematic study of Al 2 O 3 and SiO 2 / Al 2 O 3 dielectric on p-Ga2O3 is carried out including the effect of the forming gas annealing. Capacitance-voltage (C-V) curve of the Al 2 O 3 /Ga 2 O 3 gate stack shows a large hysteresis and sweep-to-sweep C-V shift compared to SiO 2 /Al 2 O 3 /Ga 2 O 3 case, which suggests SiO2 interlayer reduces the defect density in Al 2 O 3 /Ga 2 O 3 gate stack. In addition, forming gas annealing further suppresses the interface and border traps density in both Al 2 O 3 /Ga 2 O 3 and SiO 2 / Al 2 O 3 /Ga 2 O 3 gate stacks. A thin film transistor (TFT) with annealed SiO 2 / Al 2 O 3 dielectric has an on-off ratio of ~106, a subthreshold swing (SS) of ~ 0.75 V/decade, and a hysteresis width $(\mathrm{V}_{\text{Hy}})$ of~ 0.5 V compared to an on-off ratio of~105, a SS of ~1.2 V/decade, and a VHy of ~2 V in the controlled TFT with unannealed Al 2 O 3 dielectric. The increased on-off ratio by one order, reduced SS by > 400 mV/decade, and $\mathrm{V}_{\text{Hy}}$ by >1.5 V is attributed to decreased interface and border traps in annealed SiO 2 / Al 2 O 3 compared to unannealed Al 2 O 3 /Ga 2 O 3 gate stack. Interface trap density is calculated by $\mathbf{V}_{\text{Hy}}$ of the transistor, which showed a five-time reduction in annealed SiO 2 / Al 2 O 3 /Ga 2 O 3 compared to the unannealed A;2O3/Ga 2 O 3 gate stack. This study suggests that annealed SiO 2 / Al 2 O 3 dielectric stack is promising for $\boldsymbol{\upbeta}-\text{Ga}_2 \mathrm{O}_3$ transistors.

关键词： Silicon compounds Electron traps Annealing Capacitance-voltage characteristics Logic gates Dielectrics Thin film transistors

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Measurement of Water Diffusion Coefficient in Cross-Linked Gelatins Using the Terahertz Time-Domain Spectroscopy Technique

Measurement of Water Diffusion Coefficient in Cross-Linked G...

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CLEO: Applications and Technology in CLEO 2024, CLEO: A and T 2024 - Part of Conference on Lasers and Electro-Optics

关键词： Terahertz spectroscopy

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Demonstration of Ga2O3 trigate transistors on (100) silicon substrates

Demonstration of Ga2O3 trigate transistors on (100) silicon ...

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International Conference on Emerging Electronics (ICEE)

作者： Saravanan Yuvaraja Vishal Khandelwal Shibin Krishna Yi Lu Zhiyuan Liu Mritunjay Kumar Dhanu Chettri Xiao Tang Glen Issac Maciel Garcia Che-Hao Liao Xiaohang Li Advanced Semiconductor Laboratory Electrical and Computer Engineering Program CEMSE division King Abdullah University of Science and Technology (KAUST) Thuwa Saudi Arabia

In this paper we demonstrated the UWBG Ga 2 O 3 trigate transistors heterogeneously integrated on silicon substrate. This trigate transistor operates in depletion mode having decent Ion/Ioff ratio (10 5 ) and high transconductance (1 μS). Followed by the mobility is around 1.2 cm 2 /V. s. This work suggests that the ultrawide bandgap oxide transistors can be fabricated on various heterogenous substrates to achieve highly integrated, low cost, and robust electronics.

关键词： Performance evaluation Costs Photonic band gap Silicon Transistors Substrates Transconductance

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Optical Microresonators feature issue introduction

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Photonics Research 2023年第12期11卷 I0001-I0003页

作者： YUN-FENG XIAO KARTIK SRINIVASAN PASCAL DEL’HAYE MENGJIE YU Frontiers Science Center for Nano-optoelectronics and State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Microsystems and Nanotechnology Division Physical Measurement LaboratoryNational Institute of Standards and TechnologyGaithersburgMaryland 20899USA Max Planck Institute for the Science of Light 91058 ErlangenGermany Ming Hsieh Department of Electrical and Computer Engineering University of Southern CaliforniaLos AngelesCalifornia 90089USA

Optical microresonators,which confine light in both the spatial and time domains,have advanced various research areas benefiting from significantly enhanced light-matter interactions,including integrated microlasers,nonlinear frequency conversion,Kerr frequency combs,and *** the past five years,the research interests in optical microresonators have rapidly expanded and combined with other disciplines,for example,optical chaos,non-Hermitian physics,and quantum *** cutting-edge research works have enabled the creation of optical microresonators with novel properties and capabilities.

关键词： materials chaos expanded

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