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IFAC-PapersOnLine 2015年第12期48卷 203-208页

作者： Lee, Won Il Park, Poogyeon Lee, Seok Young Newcomb, Robert W. Department of Electronic and Electrical Engineering Pohang University of Science and Technology Pohang Korea Republic of Division of IT Convergence Engineering Pohang University of Science and Technology Pohang Korea Republic of Department of Electrical and Computer Engineering University of Maryland College Park MD 20742 United States

Jensen inequality has become a powerful tool of supporting summation inequalities for quadratic functions in order to obtain stability criteria for time-delayed systems since it achieves remarkable performance with a small number of decision variables. This paper suggests a new summation inequality for quadratic functions based on an auxiliary function, which is superior to the Jensen inequality. To demonstrate the superiority of the new inequality, its application to stability analysis for discrete-time delay system is provided with a simple numerical example. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Stability criteria

Constraints on dark photons and axion-like particles from SuperCDMS Soudan

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arXiv 2019年

作者： Aralis, T. Aramaki, T. Arnquist, I.J. Azadbakht, E. Baker, W. Banik, S. Barker, D. Bathurst, C. Bauer, D.A. Bezerra, L.V.S. Bhattacharyya, R. Binder, T. Bowles, M.A. Brink, P.L. Bunker, R. Cabrera, B. Calkins, R. Cameron, R.A. Cartaro, C. Cerdeño, D.G. Chang, Y.-Y. Cooley, J. Coombes, H. Corbett, J. Cornell, B. Cushman, P. de Brienne, F. di Vacri, M.L. Diamond, M.D. Fascione, E. Figueroa-Feliciano, E. Fink, C.W. Fouts, K. Fritts, M. Gerbier, G. Germond, R. Ghaith, M. Golwala, S.R. Harris, H.R. Herbert, N. Hines, B.A. Hollister, M.I. Hong, Z. Hoppe, E.W. Hsu, L. Huber, M.E. Iyer, V. Jardin, D. Jastram, A. Kelsey, M.H. Kennedy, A. Kubik, A. Kurinsky, N.A. Lawrence, R.E. Li, A. Loer, B. Asamar, E. Lopez Lukens, P. MacDonell, D. MacFarlane, D.B. Mahapatra, R. Mandic, V. Mast, N. Michaud, É.M. Michielin, E. Mirabolfathi, N. Mohanty, B. Mendoza, J.D. Morales Nagorny, S. Nelson, J. Neog, H. Orrell, J.L. Oser, S.M. Page, W.A. Pakarha, P. Partridge, R. Podviianiuk, R. Ponce, F. Poudel, S. Pyle, M. Rau, W. Ren, R. Reynolds, T. Roberts, A. Robinson, A.E. Rogers, H.E. Saab, T. Sadoulet, B. Sander, J. Schnee, R.W. Scorza, S. Senapati, K. Serfass, B. Sincavage, D.J. Stanford, C. Stein, M. Street, J. Toback, D. Underwood, R. Verma, S. Villano, A.N. von Krosigk, B. Watkins, S.L. Wills, L. Wilson, J.S. Wilson, M.J. Winchell, J. Wright, D.H. Yellin, S. Young, B.A. Yu, T.C. Zhang, E. Zhao, X. Zheng, L. Division of Physics Mathematics & Astronomy California Institute of Technology PasadenaCA91125 United States SLAC National Accelerator Laboratory Kavli Institute for Particle Astrophysics and Cosmology Menlo ParkCA94025 United States Pacific Northwest National Laboratory RichlandWA99352 United States Department of Physics and Astronomy Mitchell Institute for Fundamental Physics and Astronomy Texas A&M University College StationTX77843 United States School of Physical Sciences National Institute of Science Education and Research HBNI Jatni752050 India School of Physics & Astronomy University of Minnesota MinneapolisMN55455 United States Department of Physics University of Florida GainesvilleFL32611 United States Fermi National Accelerator Laboratory BataviaIL60510 United States Department of Physics & Astronomy University of British Columbia VancouverBCV6T 1Z1 Canada TRIUMF VancouverBCV6T 2A3 Canada Department of Physics University of South Dakota VermillionSD57069 United States Department of Physics South Dakota School of Mines and Technology Rapid CitySD57701 United States Department of Physics Stanford University StanfordCA94305 United States Department of Physics Southern Methodist University DallasTX75275 United States Department of Physics Durham University DurhamDH1 3LE United Kingdom Instituto de Física Teórica UAM/CSIC Universidad Autónoma de Madrid Madrid28049 Spain Department of Physics Queen’s University KingstonONK7L 3N6 Canada Département de Physique Université de Montréal MontréalQCH3C 3J7 Canada Department of Physics University of Toronto TorontoONM5S 1A7 Canada Department of Physics & Astronomy Northwestern University EvanstonIL60208-3112 United States Department of Physics University of California BerkeleyCA94720 United States Department of Electrical and Computer Engineering Texas A&M University College StationTX77843 United States Department of Physics University of Colorado Denver Denv

We present an analysis of electron recoils in cryogenic germanium detectors operated during the SuperCDMS Soudan experiment. The data are used to set new constraints on the axioelectric coupling of axion-like particles and the kinetic mixing parameter of dark photons, assuming the respective species constitutes all of the galactic dark matter. This study covers the mass range from 40 eV/c2 to 500 keV/c2 for both candidates, excluding previously untested parameter space for masses below ∼1 keV/c2. For the kinetic mixing of dark photons, values below 10−15 are reached for particle masses around 100 eV/c2;for the axio-electric coupling of axion-like particles, values below 10−12 are reached for particles with masses in the range of a few-hundred eV/c2. Copyright © 2019, The Authors. All rights reserved.

关键词： Photons

SoPHy: A software platform for hybrid resource management of homogeneous many-core accelerators 15

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SoPHy: A software platform for hybrid resource management of...

3rd ACM International Workshop on Many-Core Embedded Systems, MES 2015

作者： Kim, Taeyoung Kang, Jintaek Kim, Sungchan Ha, Soonhoi School of Electrical Engineering and Computer Science Seoul National University Seoul Korea Republic of Division of Computer Science and Engineering Chonbuk National University Jeonbuk Korea Republic of

ISBN: (纸本)9781450334082

As demand of higher computing power is steadily increasing, it becomes popular to equip a many-core accelerator in a computer system to run current applications. Efficient management of compute resources in such a system is challenging because various factors such as workload variation, QoS requirement change, and hardware failure may cause dynamic change of system status. Recently a variety of resource management techniques for many-core accelerators have been proposed. They are usually tailored to a specific target architecture. In this paper, we propose a software platform, SoPHy, which supports various types of many-core architectures, based on a hybrid resource management technique. SoPHy has been implemented on two different many-core architectures: the Xeon Phi coprocessor and a NoC virtual prototype. Experimental results prove that SoPHy is capable of adapting to the runtime workload variation effectively with affordable overhead of runtime resource management.

关键词： Network-on-chip

Manipulating multiple order parameters via oxygen vacancies: The case of Eu0.5Ba0.5TiO3−δ

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physical Review B 2017年第11期96卷 115105-115105页

作者： Weiwei Li Qian He Le Wang Huizhong Zeng John Bowlan Langsheng Ling Dmitry A. Yarotski Wenrui Zhang Run Zhao Jiahong Dai Junxing Gu Shipeng Shen Haizhong Guo Li Pi Haiyan Wang Yongqiang Wang Ivan A. Velasco-Davalos Yangjiang Wu Zhijun Hu Bin Chen Run-Wei Li Young Sun Kuijuan Jin Yuheng Zhang Hou-Tong Chen Sheng Ju Andreas Ruediger Daning Shi Albina Y. Borisevich Hao Yang College of Science Nanjing University of Aeronautics and Astronautics Nanjing 211106 China Department of Materials Science and Metallurgy University of Cambridge Cambridge CB3 0FS United Kingdom Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Science Beijing 100190 China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology Chengdu 610054 China Center for Integrated Nanotechnologies MS K771 Los Alamos National Laboratory Los Alamos New Mexico 87545 USA High Magnetic Field Laboratory Chinese Academy of Science Hefei 230031 China Materials Science and Engineering Program Department of Electrical and Computer Engineering Texas A&M University College Station Texas 77843-3128 USA College of Physics Optoelectronics and Energy Soochow University Suzhou 215006 China Materials Science and Technology Division Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Institut National de la Recherche Scientifique—Énergie Matériaux et Télécommunication (INRS-EMT) 1650 Boulevard Lionel Boulet Varennes J3 X 1S2 QC Canada Center for Soft Condensed Matter Physics and Interdisciplinary Research Soochow University Suzhou 215006 China Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Science Ningbo 315201 China

Controlling functionalities, such as magnetism or ferroelectricity, by means of oxygen vacancies (VO) is a key issue for the future development of transition-metal oxides. Progress in this field is currently addressed through VO variations and their impact on mainly one order parameter. Here we reveal a mechanism for tuning both magnetism and ferroelectricity simultaneously by using VO. Combining experimental and density-functional theory studies of Eu0.5Ba0.5TiO3−δ, we demonstrate that oxygen vacancies create Ti3+3d1 defect states, mediating the ferromagnetic coupling between the localized Eu 4f7 spins, and increase an off-center displacement of Ti ions, enhancing the ferroelectric Curie temperature. The dual function of Ti sites also promises a magnetoelectric coupling in the Eu0.5Ba0.5TiO3−δ.

关键词： Ferroelectricity Magnetoelectric effect Vacancies Multiferroics Oxides Thin films Transition metals Magnetization measurements Optical second-harmonic generation

Ultrasound-based automated carotid lumen diameter/stenosis measurement and its validation system

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Journal for Vascular Ultrasound 2016年第3期40卷 120-134页

作者： Asheed M. Kumar P. Krishna Kumar Ajay Gupta Luca Saba Jeny Rajan Francesco Lavra Aditya M. Sharma Shoaib Shafique Andrew Nicolaides John R. Laird Jasjit S. Suri Division of Cardiovascular Medicine Toho University Ohashi Medical Center Tokyo Japan Department of Computer Science and Engineering National Institute of Technology Karnataka India Point-of-Care Devices Global Biomedical Technologies Inc Roseville CA United States Radiology Department Brain and Mind Research Institute Weill Cornell Medical College New York NY United States Department of Radiology University of Cagliari Cagliari Italy Division of Cardiovascular Medicine Department of Medicine University of Virginia Charlottesville VA United States CorVasc Vascular Laboratory Indianapolis IN United States Vascular Diagnostic Center University of Cyprus Nicosia Cyprus UC Davis Vascular Center University of California Davis CA United States Monitoring and Diagnostic Division AtheroPoint™ Roseville CA United States Department of Electrical Engineering University of Idaho Moscow ID United States

Objective.—Degree of carotid stenosis is an important predictor to assess risk of stroke. Systolic velocity-based methods for lumen diameter and stenosis measurement are subjective. Image-based methods face a challenge because of low gradients in media and intima walls. Methods.—This article presents AtheroEdge™ 2.0, a two-stage process for automated carotid lumen diameter measurement that combats the above challenges. Stage one uses spectral analysis based on the hypothesis that far-wall adventitia is brightest. Stage two uses lumen pixel region identification based on the assumption that blood flow has constant density. Using global and local processing, lumen boundaries are detected. This clinical system outputs lumen diameter along with stenosis severity index (SSI). Results.—Our database consists of institutional review board–approved 202 patients (males/ females: 155/47) left and right common carotid artery images (404 images, Toshiba scanner). Two trained neuro radiologists performed manual lumen border tracings using ImgTracer™ software. The coefficient of correlation between automated and two manual readings was 0.91 and 0.92. Dice similarity and Jaccard index were 95.82%, 95.72% and 92.10%, 91.92%, respectively. The mean diameter error between automated and two manual readings was 0.27 ± 0.26 and 0.26 ± 0.28 mm, respectively. Precision of merit was 98.05% and 99.03% with respect to two readings. SSI showed 97% accuracy. Conclusions.—The image-based automated carotid lumen diameter and stenosis measurement system is fast, accurate, and reliable. © 2018, SAGE Publications Ltd. All rights reserved.

关键词：

On-orbit operations and offline data processing of CALET onboard the ISS

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arXiv 2018年

作者： Asaoka, Y. Ozawa, S. Torii, S. Adriani, O. Akaike, Y. Asano, K. Bagliesi, M.G. Bigongiari, G. Binns, W.R. Bonechi, S. Bongi, M. Brogi, P. Buckley, J.H. Cannady, N. Castellini, G. Checchia, C. Cherry, M.L. Collazuol, G. Di Felice, V. Ebisawa, K. Fuke, H. Guzik, T.G. Hams, T. Hareyama, M. Hasebe, N. Hibino, K. Ichimura, M. Ioka, K. Ishizaki, W. Israel, M.H. Javaid, A. Kasahara, K. Kataoka, J. Kataoka, R. Katayose, Y. Kato, C. Kawanaka, N. Kawakubo, Y. Kohri, K. Krawczynski, H.S. Krizmanic, J.F. Kuramata, S. Lomtadze, T. Maestro, P. Marrocchesi, P.S. Messineo, A.M. Mitchell, J.W. Miyake, S. Mizutani, K. Moiseev, A.A. Mori, K. Mori, M. Mori, N. Motz, H.M. Munakata, K. Murakami, H. Nakahira, S. Nishimura, J. De Nolfo, G.A. Okuno, S. Ormes, J.F. Pacini, L. Palma, F. Papini, P. Penacchioni, A.V. Rauch, B.F. Ricciarini, S.B. Sakai, K. Sakamoto, T. Sasaki, M. Shimizu, Y. Shiomi, A. Sparvoli, R. Spillantini, P. Stolzi, F. Takahashi, I. Takayanagi, M. Takita, M. Tamura, T. Tateyama, N. Terasawa, T. Tomida, H. Tsunesada, Y. Uchihori, Y. Ueno, S. Vannuccini, E. Wefel, J.P. Yamaoka, K. Yanagita, S. Yoshida, A. Yoshida, K. Yuda, T. Waseda Research Institute for Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan JEM Utilization Center Human Spaceflight Technology Directorate Japan Aerospace Exploration Agency 2-1-1 Sengen Tsukuba Ibaraki305-8505 Japan School of Advanced Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan Department of Physics University of Florence Via Sansone 1 Sesto Fiorentino50019 Italy INFN Sezione di Florence Via Sansone 1 Sesto Fiorentino50019 Italy Department of Physics University of Maryland Baltimore County 1000 Hilltop Circle BaltimoreMD21250 United States Astroparticle Physics Laboratory NASA/GSFC GreenbeltMD20771 United States Institute for Cosmic Ray Research University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa Chiba277-8582 Japan Department of Physical Sciences Earth and Environment University of Siena via Roma 56 Siena53100 Italy INFN Sezione di Pisa Polo Fibonacci Largo B. Pontecorvo 3 Pisa56127 Italy Department of Physics Washington University One Brookings Drive St. LouisMO63130-4899 United States Department of Physics and Astronomy Louisiana State University 202 Nicholson Hall Baton RougeLA70803 United States Via Madonna del Piano 10 Sesto Fiorentino50019 Italy Department of Physics and Astronomy University of Padova Via Marzolo 8 Padova35131 Italy INFN Sezione di Padova Via Marzolo 8 Padova35131 Italy University of Rome "Tor Vergata" Via della Ricerca Scientifica 1 Rome00133 Italy INFN Sezione di Rome "Tor Vergata" Via della Ricerca Scientifica 1 Rome00133 Italy Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo Sagamihara Kanagawa252-5210 Japan CRESST and Astroparticle Physics Laboratory NASA GSFC GreenbeltMD20771 United States St. Marianna University School of Medicine 2-16-1 Sugao Miyamae-ku Kawasaki Kanagawa216-8511 Japan Research Institute for Science and Engineering Waseda

The CALorimetric Electron Telescope (CALET), launched for installation on the International Space Station (ISS) in August, 2015, has been accumulating scientific data since October, 2015. CALET is intended to perform long-duration observations of high-energy cosmic rays onboard the ISS. CALET directly measures the cosmic-ray electron spectrum in the energy range of 1 GeV to 20 TeV with a 2% energy resolution above 30 GeV. In addition, the instrument can measure the spectrum of gamma rays well into the TeV range, and the spectra of protons and nuclei up to a PeV. In order to operate the CALET onboard ISS, JAXA Ground Support Equipment (JAXA-GSE) and the Waseda CALET Operations Center (WCOC) have been established at JAXA and Waseda University, respectively. Scientific operations using CALET are planned at WCOC, taking into account orbital variations of geomagnetic rigidity cutoff. Scheduled command sequences are used to control the CALET observation modes on orbit. Calibration data acquisition by, for example, recording pedestal and penetrating particle events, a low-energy electron trigger mode operating at high geomagnetic latitude, a low-energy gamma-ray trigger mode operating at low geomagnetic latitude, and an ultra heavy trigger mode, are scheduled around the ISS orbit while maintaining maximum exposure to high-energy electrons and other high-energy shower events by always having the high-energy trigger mode active. The WCOC also prepares and distributes CALET flight data to collaborators in Italy and the United States. As of August 31, 2017, the total observation time is 689 days with a live time fraction of the total time of ∼84%. Nearly 450 million events are collected with a high-energy (E >10 GeV) trigger. In addition, calibration data acquisition and low-energy trigger modes, as well as an ultra-heavy trigger mode, are consistently scheduled around the ISS orbit. By combining all operation modes with the excellent-quality on-orbit data collected thus far,

关键词： Electrons

Photocatalysts: Enhanced Solar‐to‐Hydrogen Generation with Broadband Epsilon‐Near‐Zero Nanostructured Photocatalysts (Adv. Mater. 27/2017)

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Advanced Materials 2017年第27期29卷

作者： Yi Tian Francisco Pelayo García de Arquer Cao‐Thang Dinh Gael Favraud Marcella Bonifazi Jun Li Min Liu Xixiang Zhang Xueli Zheng Md. Golam Kibria Sjoerd Hoogland David Sinton Edward H. Sargent Andrea Fratalocchi PRIMALIGHT Faculty of Electrical Engineering Applied Mathematics and Computational Science King Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Saudi Arabia Department of Electrical and Computer Engineering University of Toronto 35 St. George Street Toronto Ontario M5S 1A4 Canada Division of Physical Science and Engineering King Abdullah University of Science and Technology Thuwal 239955 Saudi Arabia Department of Mechanical and Industrial Engineering University of Toronto 5 Kings College Road Toronto Ontario M5S 3G8 Canada

Polarization-independent all-silicon dielectric metasurfaces in the terahertz regime

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光子学研究（英文） 2018年第1期6卷 01000024页

作者： Huifang Zhang Xueqian Zhang Quan Xu Qiu Wang Yuehong Xu Minggui Wei Yanfeng Li Jianqiang Gu Zhen Tian Chunmei Ouyang Xixiang Zhang Cong Hu Jiaguang Han Weili Zhang Center for Terahertz waves and College of Precision Instrument and Optoelectronics Engineering Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education) Tianjin 300072 China Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia Guangxi Key Laboratory of Automatic Detecting Technology and Instruments Guilin University of Electronic Technology Guilin 541004 China School of Electrical and Computer Engineering Oklahoma State University Stillwater Oklahoma 74078 USA e-mail: jiaghan@*** e-mail: weili.zhang@okstate.edu

Dielectric metasurfaces have achieved great success in realizing high-efficiency wavefront control in the optical and infrared ranges. Here, we experimentally demonstrate several efficient, polarization-independent, all-silicon dielectric metasurfaces in the terahertz regime. The metasurfaces are composed of cylindrical silicon pillars on a silicon substrate, which can be easily fabricated using etching technology for semiconductors. By locally tailoring the diameter of the pillars, full control over abrupt phase changes can be achieved. To show the controlling ability of the metasurfaces, an anomalous deflector, three Bessel beam generators, and three vortex beam generators are fabricated and characterized. We also show that the proposed metasurfaces can be easily combined to form composite devices with extended functionalities. The proposed controlling method has promising applications in developing low-loss, ultra-compact spatial terahertz modulation devices.

关键词： Far infrared or terahertz Metamaterials Phase shift

Manipulating Multiple order parameters via oxygen vacancies: The case of Eu0.5Ba0.5TiO3-δ

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arXiv 2017年

作者： Li, Weiwei He, Qian Wang, Le Zeng, Huizhong Bowlan, John Ling, Langsheng Yarotski, Dmitry A. Zhang, Wenrui Zhao, Run Dai, Jiahong Gu, Junxing Shen, Shipeng Guo, Haizhong Pi, Li Wang, Haiyan Wang, Yongqiang Velasco-Davalos, Ivan A. Wu, Yangjiang Hu, Zhijun Chen, Bin Li, Run-Wei Sun, Young Jin, Kuijuan Zhang, Yuheng Chen, Hou-Tong Ju, Sheng Ruediger, Andreas Shi, Daning Borisevich, Albina Y. Yang, Hao College of Science Nanjing University of Aeronautics and Astronautics Nanjing211106 China Department of Materials Science and Metallurgy University of Cambridge CambridgeCB3 0FS United Kingdom Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Science Beijing100190 China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology Chengdu610054 China Center for Integrated Nanotechnologies MS K771 Los Alamos National Laboratory Los AlamosNM87545 United States High Magnetic Field Laboratory Chinese Academy of Science Hefei230031 China Materials Science and Engineering Program Department of Electrical and Computer Engineering Texas A&M University College StationTX77843-3128 United States College of Physics Optoelectronics and Energy Soochow University Suzhou215006 China Materials Science and Technology Division Los Alamos National Laboratory Los AlamosNM87545 United States 1650 Boul. Lionel Boulet VarennesQCJ3X 1S2 Canada Center for Soft Condensed Matter Physics and Interdisciplinary Research Soochow University Suzhou215006 China Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Science Ningbo315201 China

Controlling functionalities, such as magnetism or ferroelectricity, by means of oxygen vacancies (VO) is a key issue for the future development of transition metal oxides. Progress in this field is currently addressed through VO variations and their impact on mainly one order parameter. Here we reveal a new mechanism for tuning both magnetism and ferroelectricity simultaneously by using VO. Combined experimental and density-functional theory studies of Eu0.5Ba0.5TiO3-δ, we demonstrate that oxygen vacancies create Ti3+ 3d1 defect states, mediating the ferromagnetic coupling between the localized Eu 4f7 spins, and increase an off-center displacement of Ti ions, enhancing the ferroelectric Curie temperature. The dual function of Ti sites also promises a magnetoelectric coupling in the Eu0.5Ba0.5TiO3-δ. Copyright © 2017, The Authors. All rights reserved.

关键词： Oxygen vacancies

A data-driven analysis of the influence of care coordination on trauma outcome

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arXiv 2017年

作者： Chen, You Patel, Mayur B. McNaughton, Candace D. Malin, Bradley A. Department of Biomedical Informatics Vanderbilt University Medical Center NashvilleTN United States Department of Surgery Division of Trauma Surgical Critical Care and Emergency General Surgery Vanderbilt University Medical Center NashvilleTN United States Department of Neurosurgery Vanderbilt University Medical Center NashvilleTN United States Department of Hearing and Speech Sciences Vanderbilt University NashvilleTN United States Department of Emergency Medicine Vanderbilt University Medical Center NashvilleTN United States Department of Biostatistics School of Medicine Vanderbilt University NashvilleTN United States Department of Electrical Engineering and Computer Science School of Engineering Vanderbilt University NashvilleTN United States

IMPORTANCE: Care coordination can improve efficiency and reduce health care expenditures, particularly in trauma settings, where a high-throughput of admissions necessitates communication and collaboration between a wide array of healthcare professionals across a range of operational areas in the organization. However, at the same time, the complexity of such a setting makes it challenging to investigate the relationship between coordination plan and patient outcome. OBJECTIVE: To test the hypothesis that variation in care coordination is related to LOS. DESIGN We applied a spectral co-clustering methodology to simultaneously infer groups of patients and care coordination patterns, in the form of interaction networks of health care professionals, from electronic medical record (EMR) utilization data. The care coordination pattern for each patient group was represented by standard social network characteristics and its relationship with hospital LOS was assessed via a negative binomial regression with a 95% confidence interval. SETTING AND PATIENTS This study focuses on 5,588 adult patients hospitalized for trauma at the Vanderbilt University Medical Center. The EMRs were accessed by healthcare professionals from 179 operational areas during 158,467 operational actions. MAIN OUTCOME MEASURES: Hospital LOS for trauma inpatients, as an indicator of care coordination efficiency. RESULTS: Three general types of care coordination patterns were discovered, each of which was affiliated with a specific patient group. The first patient group exhibited the shortest hospital LOS and was managed by a care coordination pattern that involved the smallest number of operational areas (102 areas, as opposed to 125 and 138 for the other patient groups), but exhibited the largest number of collaborations between operational areas (e.g., an average of 27.1 connections per operational area compared to 22.5 and 23.3 for the other two groups). The hospital LOS for the second and third pati

关键词： Hospitals