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A Digital Zero-Phase Filter for Measuring High Frequency Emissions (Supraharmonics) in electrical Distribution Networks

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A Digital Zero-Phase Filter for Measuring High Frequency Emi...

Australasian Universities Power engineering Conference, AUPEC

作者： Dilini Darmawardana Sarath Perera Duane Robinson Jan Meyer Matthias Klatt Upuli Jayatunga School of Electrical Computer and Telecommunications Engineering University of Wollongong Wollongong Australia Institute of Electrical Power Systems and High Voltage Engineering Technische Universitaet Dresden Dresden Germany Department of Electrical Engineering University of Moratuwa Moratuwa Sri Lanka

ISBN: (纸本)9781538684757

With the high penetration of power electronic interfaces and the increased use of power line carrier communication, high frequency (HF) emissions (supraharmonics) in the range of 2-150 kHz are emerging as a new power quality issue in distribution networks. Both IEC 61000-4-7 and IEC 61000-4-30 recommend the use of a high pass (HP) filter during measurement/analysis of these emissions. However, the filters used so far in HF measurements have non-linear phase characteristics making phase details unsuitable for further analysis. As a solution, this paper proposes a digital, offline, zero-phase HP filter having near ideal magnitude characteristics and a zero phase response.

关键词： Frequency measurement Voltage measurement Signal resolution Distortion measurement Current measurement Power measurement Delays

Robust medical instrument segmentation challenge 2019

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arXiv 2020年

作者： Roβ, Tobias Reinke, Annika Full, Peter M. Wagner, Martin Kenngott, Hannes Apitz, Martin Hempe, Hellena Filimon, Diana Mindroc Scholz, Patrick Tran, Thuy Nuong Bruno, Pierangela Arbelaéz, Pablo Bian, Gui-Bin Bodenstedt, Sebastian Bolmgren, Jon Lindström Bravo-Sánchez, Laura Chen, Hua-Bin González, Cristina Guo, Dong Halvorsen, Pål Heng, Pheng-Ann Hosgor, Enes Hou, Zeng-Guang Isensee, Fabian Jha, Debesh Jiang, Tingting Kirtac, Kadir Jin, Yueming Kletz, Sabrina Leger, Stefan Li, Zhixuan Maier-Hein, Klaus H. Ni, Zhen-Liang Riegler, Michael A. Schoeffmann, Klaus Shi, Ruohua Speidel, Stefanie Stenze, Michael Twick, Isabell Wang, Gutai Wang, Jiacheng Wang, Liansheng Wang, Lu Zhang, Yujie Zhou, Yan-Jie Zhu, Lei Wiesenfarth, Manuel Kopp-Schneider, Annette Müller-Stich, Beat P. Maier-Hein, Lena Heidelberg Germany University of Heidelberg Germany Heidelberg Germany Department of General Heidelberg University Hospital Visceral and Transplant Surgery Heidelberg Germany caresyntax Berlin Germany University of Chinese Academy Sciences Beijing China State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing China SimulaMet Oslo Norway Tromsø Norway Oslo Norway School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China Chengdu China Partner Site Dresden Heidelberg Germany Faculty of Medicine and University Hospital Carl Gustav Carus Technische Universität Dresden Dresden Germany Dresden Germany Universidad de Los Andes Bogotá Colombia Peking University Peking China Department of Computer Science School of Informatics Xiamen University Xiamen China Department of Computer Science and Engineering Chinese University of Hong Kong Hong Kong German Cancer Research Center Division of Biostatistics Heidelberg Germany Institute of Information Technology Klagenfurt University Austria

Intraoperative tracking of laparoscopic instruments is often a prerequisite for computer and roboticassisted interventions. While numerous methods for detecting, segmenting and tracking of medical instruments based on endoscopic video images have been proposed in the literature, key limitations remain to be addressed: Firstly, robustness, that is, the reliable performance of state-of-the-art methods when run on challenging images (e.g. in the presence of blood, smoke or motion artifacts). Secondly, generalization;algorithms trained for a specific intervention in a specific hospital should generalize to other interventions or institutions. In an effort to promote solutions for these limitations, we organized the Robust Medical Instrument Segmentation (ROBUST-MIS) challenge as an international benchmarking competition with a specific focus on the robustness and generalization capabilities of algorithms. For the first time in the field of endoscopic image processing, our challenge included a task on binary segmentation and also addressed multi-instance detection and segmentation. The challenge was based on a surgical data set comprising 10,040 annotated images acquired from a total of 30 surgical procedures from three different types of surgery. The validation of the competing methods for the three tasks (binary segmentation, multi-instance detection and multi-instance segmentation) was performed in three different stages with an increasing domain gap between the training and the test data. The results confirm the initial hypothesis, namely that algorithm performance degrades with an increasing domain gap. While the average detection and segmentation quality of the best-performing algorithms is high, future research should concentrate on detection and segmentation of small, crossing, moving and transparent instrument(s) (parts). Copyright © 2020, The Authors. All rights reserved.

关键词： Endoscopy

TOI-3757 b: A low density gas giant orbiting a solar-metallicity M dwarf

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arXiv 2022年

作者： Kanodia, Shubham Libby-Roberts, Jessica Cañas, Caleb I. Ninan, Joe P. Mahadevan, Suvrath Stefansson, Gudmundur Lin, Andrea S.J. Jones, Sinclaire Monson, Andrew Parker, Brock A. Kobulnicky, Henry A. Swaby, Tera N. Powers, Luke Beard, Corey Bender, Chad F. Blake, Cullen H. Cochran, William D. Dong, Jiayin Diddams, Scott A. Fredrick, Connor Gupta, Arvind F. Halverson, Samuel Hearty, Fred Logsdon, Sarah E. Metcalf, Andrew J. McElwain, Michael W. Morley, Caroline Rajagopal, Jayadev Ramsey, Lawrence W. Robertson, Paul Roy, Arpita Schwab, Christian Terrien, Ryan C. Wisniewski, John Wright, Jason T. Department of Astronomy & Astrophysics 525 Davey Laboratory The Pennsylvania State University University ParkPA16802 United States Center for Exoplanets and Habitable Worlds 525 Davey Laboratory The Pennsylvania State University University ParkPA16802 United States Department of Astrophysical Sciences Princeton University 4 Ivy Lane PrincetonNJ08540 United States Department of Physics & Astronomy University of Wyoming LaramieWY82070 United States Department of Physics and Astronomy The University of California Irvine IrvineCA92697 United States Steward Observatory The University of Arizona 933 N. Cherry Avenue TucsonAZ85721 United States Department of Physics and Astronomy University of Pennsylvania 209 S 33rd St PhiladelphiaPA19104 United States McDonald Observatory Department of Astronomy The University of Texas Austin United States Center for Planetary Systems Habitability The University of Texas Austin United States Time and Frequency Division National Institute of Standards and Technology 325 Broadway BoulderCO80305 United States Department of Physics University of Colorado 2000 Colorado Avenue BoulderCO80309 United States Electrical Computer & Energy Engineering University of Colorado 425 UCB BoulderCO80309 United States Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive PasadenaCA91109 United States NSF's National Optical-Infrared Astronomy Research Laboratory 950 N. Cherry Ave. TucsonAZ85719 United States Space Vehicles Directorate Air Force Research Laboratory 3550 Aberdeen Ave. SE Kirtland AFB NM87117 United States Time and Frequency Division National Institute of Technology 325 Broadway BoulderCO80305 United States Department of Physics University of Colorado Boulder 390 UCB BoulderCO80309 United States Exoplanets and Stellar Astrophysics Laboratory NASA Goddard Space Flight Center GreenbeltMD20771 United States Department of Astronomy The University of Texas Austin Uni

We present the discovery of a new Jovian-sized planet, TOI-3757 b, the lowest density transiting planet known to orbit an M dwarf (M0V). This planet was discovered around a solar-metallicity M dwarf, using TESS photometry and confirmed with precise radial velocities from HPF and NEID. With a planetary radius of 12.0−+0.40.5 R⊕ and mass of 85.3+8.8−8.7 M⊕, not only does this object add to the small sample of gas giants (∼ 10) around M dwarfs, but also, its low density (ρ = 0.27+0.05−0.04 g cm−3) provides an opportunity to test theories of planet formation. We present two hypotheses to explain its low density;first, we posit that the low metallicity of its stellar host (∼ 0.3 dex lower than the median metallicity of M dwarfs hosting gas giants) could have played a role in the delayed formation of a solid core massive enough to initiate runaway accretion. Second, using the eccentricity estimate of 0.14 ± 0.06 we determine it is also plausible for tidal heating to at least partially be responsible for inflating the radius of TOI-3757b b. The low density and large scale height of TOI-3757 b makes it an excellent target for transmission spectroscopy studies of atmospheric escape and composition (TSM ∼ 190). We use HPF to perform transmission spectroscopy of TOI-3757 b using the helium 10830 Å line. Doing this, we place an upper limit of 6.9 % (with 90% confidence) on the maximum depth of the absorption from the metastable transition of He at ∼ 10830 Å, which can help constraint the atmospheric mass loss rate in this energy limited regime. © 2022, CC BY.

关键词： Orbits

A portable optical sensing system for rapid detection of fluorescence spectra

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光电工程 2017年第5期44卷 483-487页

作者： Xiaoguang Li Haoyu Yu Yuenkeong Yew Hongzhong Liu Minghui Hong Xi'an Microelectronics Technology Institute State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3

Development of a prototype of a portable optical sensing system is presented for fast detecting of samples’fluorescence spectra.A compact configuration is achieved by integrating a small spectrometer,a microcontroller,a Universal Serial Bus(USB)Host Shield,a network module,and a web *** fluorescence spectra of a tested sample can be *** the test data are sent through network communication to our Cloud Server which can store the data for further *** this configuration,test results can be revealed in a short time and downloaded by users to their laptops,tablets or cellphones anytime and anywhere.

关键词：光学传感系统荧光光谱控制器光电工程

Exceptional points-based optical amplifiers

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arXiv 2019年

作者： Zhong, Q. Ozdemir, S.K. Eisfeld, A. Metelmann, A. El-Ganainy, R. Department of Physics and Henes Center for Quantum Phenomena Michigan Technological University HoughtonMI49931 United States Department of Engineering Science and Mechanics Pennsylvania State University University ParkPA16802 United States Max Planck Institute for the Physics of Complex Systems Nöthnitzer Strasse 38 Dresden01187 Germany Dahlem Center for Complex Quantum Systems Fachbereich Physik Freie Universität Berlin Berlin14195 Germany Department of Electrical and Computer Engineering Michigan Technological University HoughtonMI49931 United States

The finite gain-bandwidth product is a fundamental figure of merit that restricts the operation of standard optical amplifiers. In microcavity setups, this becomes a serious problem due to the narrow bandwidth of the device. Here we introduce a new design paradigm based on exceptional points, that relaxes this limitation and allows for building a new generation of optical amplifiers that exhibits better gain-bandwidth scaling relations. Importantly, our results can be extended to other physical systems such as acoustics and microwaves. Copyright © 2019, The Authors. All rights reserved.

关键词： Optical switches

Radiation Assurance of CubeSat Payloads Using Bayesian Networks and Fault Models

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Radiation Assurance of CubeSat Payloads Using Bayesian Netwo...

2018 Annual Reliability and Maintainability Symposium, RAMS 2018

作者： Austin, Rebekah A. Mahadevan, Nagabhushan Witulski, Arthur F. Evans, John Witulseki, Arthur F. Vanderbilt University NashvilleTN37235 United States Institute for Software Integrated Systems Department of Electrical Engineering and Computer Science Vanderbilt University 1025 16th Av. South Suite 102 NashvilleTN37212 United States Institute of Space and Defense Electronics Department of Electrical Engineering and Computer Science Vanderbilt University 1025 16th Avenue South Suite 200 NashvilleTN37212 United States Office of Safety and Mission Assurance NASA 300 E St SW WashingtonDC20546 United States

ISBN: (纸本)9781538628706

Commercial off-the-shelf (COTS) electronics are used in satellites that span the size, cost, and acceptable risk spectrum. At one extreme the CubeSat, a platform originally created for university-based spacecraft design, is often constructed only from COTS electronics. At the other extreme, even high-budget NASA spacecraft use COTS electronics in non-mission critical circuits, especially when no radiation-hardened alternatives exist or the radiation-hardened parts do not meet the system requirements. There is significant uncertainty in the radiation test results of COTS electronics;hence additional means of assessing risk and radiation hardness are needed. In this work we construct a fault-propagation model of a CubeSat payload in a SysML platform, and then develop a Bayesian network from the fault model of the system. The sensitivity of the system to variations in component radiation response can be evaluated quantitatively, within the limits of the assumptions and available data. This sensitivity study then informs the structure and content of the overall radiation-reliability assurance case. © 2018 IEEE.

关键词： Bayesian networks

A molecular single-cell lung atlas of lethal COVID-19 (vol 595, pg 114, 2021)

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NATURE 2021年第7882期598卷 E2-E2页

作者： Melms, Johannes C. Biermann, Jana Huang, Huachao Wang, Yiping Nair, Ajay Tagore, Somnath Katsyv, Igor Rendeiro, Andre F. Amin, Amit Dipak Schapiro, Denis Frangieh, Chris J. Luoma, Adrienne M. Filliol, Aveline Fang, Yinshan Ravichandran, Hiranmayi Clausi, Mariano G. Alba, George A. Rogava, Meri Chen, Sean W. Ho, Patricia Montoro, Daniel T. Kornberg, Adam E. Han, Arnold S. Bakhoum, Mathieu F. Anandasabapathy, Niroshana Suarez-Farinas, Mayte Bakhoum, Samuel F. Bram, Yaron Borczuk, Alain Guo, Xinzheng V. Lefkowitch, Jay H. Marboe, Charles Lagana, Stephen M. Del Portillo, Armando Tsai, Emily J. Zorn, Emmanuel Markowitz, Glen S. Schwabe, Robert F. Schwartz, Robert E. Elemento, Olivier Saqi, Anjali Hibshoosh, Hanina Que, Jianwen Izar, Benjamin Department of Medicine Division of Hematology/Oncology Columbia University Irving Medical Center New York NY USA Columbia Center for Translational Immunology Columbia University Irving Medical Center New York NY USA Herbert Irving Comprehensive Cancer Center Columbia University Irving Medical Center New York NY USA Program for Mathematical Genomics Columbia University New York NY USA Columbia Center for Human Development Columbia University Irving Medical Center New York NY USA Division of Digestive and Liver Diseases Columbia University Irving Medical Center New York NY USA Department of Medicine Columbia University Irving Medical Center New York NY USA Institute of Human Nutrition Columbia University New York NY USA Department of Systems Biology Columbia University Irving Medical Center New York NY USA Department of Pathology and Cell Biology Columbia University Irving Medical Center New York NY USA Institute for Computational Biomedicine Weill Cornell Medicine New York NY USA Caryl and Israel Englander Institute for Precision Medicine Weill Cornell Medicine New York NY USA WorldQuant Initiative for Quantitative Prediction Weill Cornell Medicine New York NY USA Department of Physiology and Biophysics Weill Cornell Medical College New York NY USA Department of Dermatology Weill Cornell Medical College New York NY USA Meyer Cancer Center Weill Cornell Medical College New York NY USA Laboratory of Systems Pharmacology Harvard Medical School Boston MA USA Klarman Cell Observatory Broad Institute of MIT and Harvard Cambridge MA USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Department of Cancer Immunology and Virology Dana-Farber Cancer Center Boston MA USA Human Immune Monitoring Core Columbia University Irving Medical Center New York NY USA Department of Medicine Division of Pulmonary and Critical Care Massachusetts General Hospital Boston MA USA Cell Circu

Cooperative repair: Constructions of optimal MDS codes for all admissible parameters

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arXiv 2018年

作者： Ye, Min Barg, Alexander Department of Electrical Engineering Princeton University PrincetonNJ United States Department of Electrical and Computer Engineering Institute for Systems Research University of Maryland College ParkMD20742 United States Iitp Ras Moscow

Two widely studied models of multiple-node repair in distributed storage systems are centralized repair and cooperative repair. The centralized model assumes that all the failed nodes are recreated in one location, while the cooperative one stipulates that the failed nodes may communicate but are distinct, and the amount of data exchanged between them is included in the repair bandwidth. As our first result, we prove a lower bound on the minimum bandwidth of cooperative repair. We also show that the cooperative model is stronger than the centralized one, in the sense that any MDS code with optimal repair bandwidth under the former model also has optimal bandwidth under the latter one. These results were previously known under the additional "uniform download" assumption, which is removed in our proofs. As our main result, we give explicit constructions of MDS codes with optimal cooperative repair for all possible parameters. More precisely, given any n, k, h, d such that 2 ≤ h ≤ n - d ≤ n-k we construct pn, k) MDS codes over the field F of size |F| ≥ pd + 1 - k)n that can optimally repair any h erasures from any d helper nodes. The repair scheme of our codes involves two rounds of communication. In the first round, each failed node downloads information from the helper nodes, and in the second one, each failed node downloads additional information from the other failed nodes. This implies that our codes achieve the optimal repair bandwidth using the smallest possible number of rounds. Copyright © 2018, The Authors. All rights reserved.

关键词： Repair

Quickest search for local structures in random graphs

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Quickest search for local structures in random graphs

作者： Heydari, Javad Tajer, Ali Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNY12180 United States

A network of agents that form a random graph is considered. Each agent represents an information source that generates a sequence of random variables (RVs). The RVs generated by an unknown subset of nodes are correlated according to a known kernel, while the remaining nodes generate independent and identically distributed random variables. To identify and localize the desired unknown subset of correlated nodes, this paper formalizes and delineates a quickest search process, which is the strategy that minimizes the average number of measurements. Despite its widespread applications, the problem of identifying subgraphs with such desired correlation structures is often investigated under the fixed sample-size settings, in which the data acquisition process and the inferential mechanisms are decoupled. Motivated by the significant advantages of sequential methods for agile inference, this paper analyzes this problem under a fully sequential setting. Specifically, it offers a framework that unifies the intertwined processes of information gathering and decision making, and through a constructive proof, it provides an optimal sequential data-gathering process as well as the attendant decision rules for the quickest search of interest. © 2015 IEEE.

关键词： Random variables