检索结果-内蒙古大学图书馆

49th International Conference on Computers and Industrial engineering, CIE 2019

作者： Satyro, Walter Cardoso Martens, Mauro Luiz Spinola, Mauro de Mesquita Vanalle, Rosangela Maria Lucato, Wagner Cezar Neto, Geraldo Cardoso de Oliveira Pinto, Luiz Fernando Rodrigues Post-graduate Program in Production Engineering Nove de Julho University-UNINOVE Sao PauloSP Brazil Pro-Rectory of Research Polytechnic School Department of Production Engineering University of Sao Paulo – USP Sao PauloSP Brazil

Industry 4.0 has drawn the attention of researchers around the world for its potential ability to increase competitiveness of the companies that can use it. Although much research has emphasized the technological aspect, little attention has been paid to the challenges and opportunities that the companies which intend to implement it expect to face. Based on secondary data this paper involved a research made with 135 companies in Ireland, 246 in Brazil and 305 in Argentina, to study the expected benefits and internal and external barriers that these 686 have in relation to the implementation of Industry 4.0. The practical implication and originality of this study is to present common points and some differences that these companies have, so researchers can guide their studies to try to overcome the main barriers, improving potential opportunities and helping to link research with practice more effectively. © 2019, Computers and Industrial engineering. All rights reserved.

关键词： Industry 4.0

来源：评论

学校读者我要写书评

暂无评论

Contour Detection from Ultrasound Kidney Images with A Coarse-to-Fine Approach

Contour Detection from Ultrasound Kidney Images with A Coars...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： Tao Peng Yidong Gu Yanqing Xu Caishan Wang Lei Zhang Jing Cai School of Future Science and Engineering Soochow University Suzhou China Department of Radiation Oncology UT Southwestern Medical Center Dallas TX USA Department of Medical Ultrasound the Affiliated Suzhou Hospital of Nanjing Medical University Suzhou Municipal Hospital Suzhou Jiangsu China McDermott Center for Human Growth and Development University of Texas Southwestern Medical Center Dallas Texas USA Department of Ultrasound the Second Affiliated Hospital of Soochow University Suzhou China Graduate Program of Medical Physics and Data Science Research Center Duke Kunshan University Kunshan Jiangsu China Department of Health Technology and Informatics The Hong Kong Polytechnic University Hong Kong China

Ultrasound kidney image segmentation presents significant challenges due to missing or ambiguous boundaries. In this study, we introduce a coarse-to-refinement approach incorporating four novel aspects. Firstly, we leverage the properties of a principal curve (PC) to automatically fine-tune the curve shape and employ a neural network's learning ability to reduce model error. Secondly, a deep fusion learning network is utilized for the coarse segmentation step, incorporating a parallel architecture to enhance deep-learning performance. Thirdly, addressing the limitation of standard PC-based methods in determining the number of vertices automatically, we propose an automatic searching polygon tracking method using a mean shift clustering-based approach to replace the projection and vertex extension step in standard PC-based methods. Lastly, we develop an explainable mathematical map function for the kidney contour, as denoted by the neural network output (i.e., optimized vertices), which aligns well with the ground truth contour. We conducted various experiments to evaluate our method's performance, demonstrating its effectiveness in ultrasound kidney image segmentation.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Correction to: Social vulnerability to long-duration power outages in Brazil

引用

Natural Hazards 2024年第3期121卷 3151-3151页

作者： Dugan, Jesse Gonçalves, Edson Costa, Luciana Dutra, Joisa Souza, Rafael Mohagheghi, Salman Advanced Energy Systems Graduate Program Colorado School of Mines Golden USA Fundação Getulio Vargas Center for Studies in Regulation and Infrastructure Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Faculdade de Ciências Econômicas Rio de Janeiro Brazil Electrical Engineering Department Colorado School of Mines Golden USA

来源：评论

学校读者我要写书评

暂无评论

A study on time efficiency of CSMA/CA in inter-vehicle communication systems 8

A study on time efficiency of CSMA/CA in inter-vehicle commu...

引用

8th IEEE Global Conference on Consumer Electronics, GCCE 2019

作者： Kato, Masashi Fujii, Masahiro Graduate School of Engineering Utsunomiya University Department of Information Systems Science 7-1-2 Yoto Utsunomiya Tochigi Tochigi Japan Graduate Program in Information Electrical and Electronics Systems Engineering Utsunomiya University 7-1-2 Yoto Utsunomiya Tochigi Tochigi Japan

ISBN: (纸本)9781728135755

CSMA/CA has been widely accepted as a Media Access Control scheme for Inter-Vehicle Communication systems. In CSMA/CA, a mobile station waits a frame transmission during a backoff interval based on random value. Then, the mobile station transmits the frame if the others do not transmit any frames. In this paper, we evaluate system performances of CSMA/CA from the viewpoint of a time efficiency and average frame delay time varying the range of random value by network simulations. © 2019 IEEE.

关键词： Efficiency

来源：评论

学校读者我要写书评

暂无评论

Cavity-mediated superthermal phonon correlations in the ultrastrong coupling regime

arXiv

引用

arXiv 2024年

作者： Kim, Dasom Hou, Jin Lee, Geon Agrawal, Ayush Kim, Sunghwan Zhang, Hao Bao, Di Baydin, Andrey Wu, Wenjing Tay, Fuyang Huang, Shengxi Chia, Elbert E.M. Kim, Dai-Sik Seo, Minah Mohite, Aditya D. Hagenmüller, David Kono, Junichiro Applied Physics Graduate Program Smalley–Curl Institute Rice University HoustonTX77005 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Sensor System Research Center Korea Institute of Science and Technology Seoul02792 Korea Republic of Department of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of Department of Chemical and Biomolecular Engineering Rice University Houston77005 United States Ulsan44919 Korea Republic of Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore Smalley–Curl Institute Rice University HoustonTX77005 United States Rice Advanced Materials Institute Rice University HoustonTX77005 United States KU–KIST Graduate School of Converging Science and Technology Korea University Seoul02841 Korea Republic of Université de Strasbourg CNRS Strasbourg67200 France Department of Physics and Astronomy Rice University HoustonTX77005 United States

Phonons, or vibrational quanta, are behind some of the most fundamental physical phenomena in solids, including superconductivity, Raman processes, and broken-symmetry phases. It is therefore of fundamental importance to find ways to harness phonons for controlling these phenomena and developing novel quantum technologies. However, the majority of current phonon control techniques rely on the use of intense external driving fields or strong anharmonicities, which restricts their range of applications. Here, we present a scheme for controlling the intensity fluctuations in phonon emission at room temperature based on multimode ultrastrong light–matter coupling. The multimode ultrastrong coupling regime is achieved by coupling two optical phonon modes in lead halide perovskites to an array of nanoslots, which operates as a single-mode cavity. The extremely small mode volume of the nanoslots enables unprecedented coupling strengths in a cavity phonon-polariton system. In the far-detuned, low-cavity-frequency regime, we demonstrate that the nanoslot resonator mediates an effective coupling between the phonon modes, resulting in superthermal phonon bunching in thermal equilibrium, both within the same mode and between different modes. Experimental results are in good agreement with a multimode Hopfield model. Our work paves the way for the tailoring of phonons to modify charge and energy transport in perovskite materials, with potential applications in light-collecting or emitting devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Perovskite

来源：评论

学校读者我要写书评

暂无评论

Analyzing the Implications of New Technologies to the Management of Operations – Protocol Proposal and Application Illustration

引用

Procedia Manufacturing 2019年 39卷 904-912页

作者： Paulo Henrique Brunheroto Cassiano Souza Beller Fernando Deschamps Manufacturing Engineering Graduate Program Department of Mechanical Engineering Federal University of Parana Curitiba PR Brazil Industrial and Systems Engineering Graduate Program Polytechnic School Pontifícia Universidade Católica do Paraná Curitiba PR Brazil

The increasing adoption of new automation and information technologies are transforming production systems into cyber-physical systems (CPS). Although consulting companies have developed management frameworks to better characterize the implications of these technologies to how operations are managed, mainly focusing on new business models, efficiency, and effectiveness, the real impacts on decision areas (e.g., quality management) and performance objectives (e.g., flexibility) are still unclear. How are management systems being transformed? Are new managerial approaches emerging that address the particularities of new technologies? What are the critical success factors for conducting this transformation? To address these questions, a more systematic approach needs to be undertaken. This paper contributes to this by presenting a protocol to be used in systematic studies of the implications of the adoption of new technologies to the management of operations, and by illustrating its application to the analysis of the adoption of a cognitive vision system in an automotive manufacturer primarily deployed for improving product quality. The analysis protocol is based on Pettigrew’s dimensions of context, content, and process for change initiatives and is further subdivided into information requirements, variables to be analyzed and its potential sources of data. The case shows that the application of the protocol was able to reveal that besides expected effects on quality and productivity, new forms of interaction among workers and between workers and supervisors emerged that need further investigation. From the results of the case, future applications of the protocol are discussed.

关键词： management of operations transformation quality management cognitive vision system

来源：评论

学校读者我要写书评

暂无评论

Advancing mixed methods in psychological research

引用

Methods in Psychology 2020年 3卷

作者： Creamer, Elizabeth G. Reeping, David Educational Research Program School of Education Virginia Polytechnic Institute and State University Blacksburg 24060 VA United States Bradley Department of Electrical and Computer Engineering College of Engineering Virginia Polytechnic Institute and State University Blacksburg 24060 VA United States

The aim of this methodological commentary with a research component is to promote informed uses of mixed methods in psychological research. We used a concurrent mixed methods research design to compare the insights gained about the use of mixed methods in psychological research from two quantitative prevalence studies with information gleaned from a qualitative, meta-synthesis of data supplied in 11 articles and chapters that reviewed its uses in psychological research. It is likely that the dispersion of the examples across diverse publishing venues obscures any sense that it is a mainstream methodology in psychology. © 2020 The Authors

关键词： Mixed Methods Multi-method research Psychology

来源：评论

学校读者我要写书评

暂无评论

Scalable Metagrating for Efficient Ultrasonic Focusing

引用

Physical Review Applied 2021年第6期16卷 064014-064014页

作者： Yan Kei Chiang Li Quan Yugui Peng Shahrokh Sepehrirahnama Sebastian Oberst Andrea Alù David A. Powell School of Engineering and Information Technology University of New South Wales Canberra ACT 2610 Australia Department of Electrical and Computer Engineering The University of Texas at Austin Austin Texas 78712 USA Photonics Initiative Advanced Science Research Center City University of New York New York New York 10031 USA Centre for Audio Acoustics and Vibration University of Technology Sydney Broadway NSW 2007 Australia Physics Program Graduate Center City University of New York New York New York 10016 USA

Acoustic metalenses have been pursued over the past decades due to their pivotal role in a wide variety of applications. Recent research efforts have demonstrated that, at ultrasonic regimes, acoustic levitation can be realized with standing waves, which are created by the interference between incoming and reflected focused waves. However, the conventional gradient-metasurface approach to focus ultrasonic waves is complex, leading to poor scalability. In this work, we propose a design principle for ultrasonic metalenses, based on metagratings—arrays of discrete scatters with coarser features than gradient metasurfaces. We achieve beam focusing by locally controlling the excitation of a single diffraction order with the use of metagratings, with geometry adiabatically varying over the lens aperture. We show that our metalens can effectively focus impinging ultrasonic waves to a focal point with a full width at half maximum of 0.364 of the wavelength. The focusing performance of the metalens is demonstrated experimentally, validating our proposed approach. This metagrating approach to focusing can be adopted for different operating frequencies by scaling the size of the structure, which has coarse features suitable for high-frequency designs, with potential applications ranging from biomedical science to nondestructive testing.

关键词： Acoustic measurements Acoustic metamaterials Acoustic modeling Acoustic wave phenomena Beam optics Ultrasonics Bloch-Floquet theorem Ultrasound techniques

来源：评论

学校读者我要写书评

暂无评论

Non-Hermitian CNH = 2 Chern insulator protected by generalized rotational symmetry

arXiv

引用

arXiv 2021年

作者： Chen, Kai Khanikaev, Alexander B. Department of Physics City College of New York New YorkNY10031 United States Department of Electrical Engineering Grove School of Engineering City College The City University of New York 140th Street and Convent Avenue New YorkNY10031 United States Physics Program Graduate Center of the City University of New York New YorkNY10016 United States

We propose a non-Hermitian topological system protected by the generalized rotational symmetry which invokes rotation in space and Hermitian conjugation. The system, described by the tight-binding model with reciprocal imaginary next-nearest-neighbor hopping, is found to host two pairs of in-gap edge modes in the gapped topological phase, and is characterized by the non-Hermitian (NH) Chern number CNH = 2. The quantization of the non-Hermitian Chern number is shown to be protected by the generalized rotational symmetry (Equation presented) of the system. Our finding paves the way towards novel non-Hermitian topological systems characterized by large values of topological invariants and hosting multiple in-gap edge states, which can be used for topologically resilient multiplexing. © 2021, CC BY.

关键词： Topology

来源：评论

学校读者我要写书评

暂无评论

Terahertz chiral photonic-crystal cavities with broken time-reversal symmetry

arXiv

引用

arXiv 2024年

作者： Tay, Fuyang Sanders, Stephen Baydin, Andrey Song, Zhigang Welakuh, Davis M. Alabastri, Alessandro Rokaj, Vasil Dag, Ceren B. Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley–Curl Institute Rice University HoustonTX77005 United States Smalley–Curl Institute Rice University HoustonTX77005 United States John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA02139 United States Max Planck Institute for The Structure and Dynamics of Matter Luruper Chaussee 149 Hamburg22761 Germany ITAMP Harvard-Smithsonian Center for Astrophysics CambridgeMA02138 United States Department of Physics Harvard University CambridgeMA02138 United States Department of Physics Villanova University VillanovaPA19085 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States

Strong coupling between matter and vacuum electromagnetic fields in a cavity can induce novel quantum phases in thermal equilibrium via symmetry breaking. Particularly, coupling with circularly polarized fields can break time-reversal symmetry, leading to topological modifications in the band structure. Therefore, chiral optical cavities that host chiral vacuum fields are being sought, especially in the terahertz (THz) frequency range, where various large-oscillator-strength resonances exist. Here, we present a novel approach to achieving THz chiral photonic-crystal cavities (PCCs) with high-quality factors (>400) using a magnetoplasma in a lightly doped semiconductor. Numerical simulations of an optimized structure based on InSb in a small perpendicular magnetic field (∼0.2 T) show chiral cavity resonances with near-perfect ellipticity at the surfaces of the central dielectric layer, where one can place atomically thin materials like monolayer graphene. We theoretically estimate an energy gap on the order of 1 meV in graphene when coupled to our proposed chiral cavity, which is potentially measurable in experiments. These THz chiral PCCs offer a promising platform for exploring new phases in cavity-dressed condensed matter with broken time-reversal symmetry. Copyright © 2024, The Authors. All rights reserved.

关键词： Crystal symmetry

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：