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11th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2016

作者： Weiyu, Shen Guohu, Chen Guangqiu, Zhang National Digital Switching System Engineering and Technological R and D Center Zhengzhou China

ISBN: (纸本)9781509047420

In this paper, we present a meander-line monopole antenna for Unmanned Aerial Vehicle (UVA). In order to improve the resonant characteristic and expand the bandwidth, a couple of coupled patches have been added. It also improves the radiation characteristics in higher frequency. The antenna realizes omni-directional radiation in the horizontal plane when operating in780MHz-900MHz and 1.20GHz-2.28GHz. The antenna is conformed on the side of airframe and can be widely used as communication antenna on UVAs for its performance of dual-band and wideband. © 2016 IEEE.

关键词： Monopole antennas

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Image segmentation based on local Chan-Vese model optimized by max-flow algorithm 17

Image segmentation based on local Chan-Vese model optimized ...

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17th IEEE/ACIS International Conference on Software engineering, Artificial Intelligence, Networking and Parallel/distributed Computing, SNPd 2016

作者： Zhongguo, Li Lei, Zeng Ti, Wang Jian, Chen Bin, Yan National Digital Switching System Engineering and Technological R and D Center Zhengzhou China

ISBN: (纸本)9781509022397

Image segmentation can be used in non-destructive testing, tracking and recognition. Level set method for image segmentation has poor performance on efficiency. In this paper, we propose to use max-flow algorithm to optimize a locally improved Chan-Vese model for image segmentation in the presence of intensity inhomogeneity. The energy function of local Chan-Vese model is introduced firstly. This model consists of global term, local term and penalty term and the local term contributes the segmentation for images with intensity inhomogeneity. Then, we convert this energy function to the frame of Graph Cut whose energy function can be efficiently minimized by max-flow algorithm. As a result, the process of optimization of local Chan-Vese model can be accelerated by using max-flow algorithm. The experiments demonstrate that the proposed method can achieve satisfactory segmentation for images with intensity inhomogeneity as well as very high efficiency. © 2016 IEEE.

关键词： Image segmentation

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A Method for Tuning the Frequency Series Wave Speed in Hydraulic Flexible Hose 4th

A Method for Tuning the Frequency Series Wave Speed in Hydra...

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4th International Conference on Advanced engineering Theory and Applications, AETA 2017

作者： Jeong, Hwang Hun Kang, Man Gon Lee, Ill Young Yoon, Jong Il Hydraulic System Lab. Green Technology Research Division Korea Construction Equipment Technology Institute 36 Sandan-ro Gunsan-siJeollabuk-do54004 Korea Republic of R&D Center Hyundai Construction Equipment 55 Bundang-ro Bundang-gu Seongnam-siGyeonggi-do13591 Korea Republic of Department of Mechanical Design Engineering Pukyong National University 365 Sinsun-ro Nam-gu Busan48547 Korea Republic of

ISBN: (纸本)9783319698137

The hydraulic system has a pump that converts the mechanical energy to the hydraulic one. This pump is a source of system’s noise which is generated from flow pulsation and pressure’s violent fluctuation in cylinder chambers. This noise is propagated with tube and structural object. A wave speed can be used to calculate the flow pulsation and pressure one in the transfer matrix method which is express the tube’s mathematical model. So it is important to know about a wave speed in the hose for reduce the system’s noise. But a wave speed is not constant in flexible hose. This study is a method to find a transfer function of wave speed in the flexible tube’s wall model. This wall model already had been suggested. And 3 parameters of this wall model also had been tuned by trial and error method in the former studies. But it is so difficult to apply this method to the 5 parameters model because searching ranges of wall model variable are too large. A rCGA (real coded genetic algorithm) can be answer to solve this problem in this study. © Springer International Publishing AG 2018.

关键词： Hose

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Characteristic analysis and modeling for the near field radiation of FPGA

Characteristic analysis and modeling for the near field radi...

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IEEE International Symposium on Electromagnetic Compatibility (EMC-Beijing)

作者： Junping Cheng Changlin Zhou daojie Yu Zhisheng Qian Mengjuan Chai China national digital switch system engineering & technological R & D center Zhengzhou China

To predict the radiation emission of the FPGA, the radiation emission model for the chip is proposed with ICEM and the simulation result is also presented in this paper. The linear near-field surface scan system (LNFS) following electromagnetic compatibility standard is applied to measure the emission. It is illustrated that the simulation results agree with the measurements, so the value of the model for practical application is verified.

关键词： Integrated circuit modeling Probes Phase locked loops Field programmable gate arrays Semiconductor device measurement Magnetic fields

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Identification of conductive leakage signal in power cable based on multi-classification PSO-SVM

Identification of conductive leakage signal in power cable b...

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IEEE International Symposium on Electromagnetic Compatibility (EMC-Beijing)

作者： Zhisheng Qian Changlin Zhou Junping Cheng Qinmin Wang China national digital switch system engineering & technological R & D center Zhengzhou China

In order to effectively identify and extract the red signal from the leakage signal in the computer's power line, a method based on particle swarm optimization (PSO) is proposed to optimize the multi classification support vector machine (SVM). Firstly, the conductive leakage signal is filtered. Then the SVM penalty parameter and kernel parameter are optimized by PSO, the conduction leakage signal is trained and classified. Finally, the classification performance of the un-optimized SVM is compared with PSO-SVM. The result shows that this method has higher classification rate than the grid search method. The classification and recognition rate reaches 87.23%.

关键词： Support vector machines Training Search methods Kernel Algorithm design and analysis Power cables Electromagnetics

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direct position determination based on unitary space-time subspace data fusion

Direct position determination based on unitary space-time su...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Jie-xin Yin rui-rui Liu ding Wang Ying Wu Department of Communication Engineering Zhengzhou Information Science and Technology Institute Zhengzhou Henan P.R. China National Digital Switching System Engineering and Technology Research Center Zhengzhou Henan P.R.China

ISBN: (纸本)9781538620632;9781538620625

direct position determination (dPd) is a single-step method which directly localizes transmitters from sensor outputs without computing intermediate parameters. Compared with conventional two-step localization methods, dPd achieves higher accuracy especially under low signal to noise ratio (SNr) conditions. This paper proposes an improved subspace data fusion (SdF)-based dPd algorithm with a moving array. different from the existing SdF-based dPd which uses only the arrival angle information, the proposed algorithm exploits the location information embedded in both arrival angles and doppler shifts. It relies on a unitary space-time SdF, where multiple stationary transmitters are directly localized by fusing all the unitary (real-valued) space-time subspaces at all positions of the moving array. Therefore, our algorithm realizes the localization by real-valued computations. The simulation results show the superior localization performance of the proposed dPd compared to the existing SdF-based dPd and two-step localization algorithms.

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Numerical analysis of laser thermal compression bonding for flip chip package

Numerical analysis of laser thermal compression bonding for ...

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Electronics Packaging technology Conference (EPTC)

作者： Won Jae Lee Jin Yeong Park Hyun Jin Nam Sung-Hoon Choa Dept. Of Manufacturing System and Design Engineering Seoul National University of Science and Technology Seoul Republic of Korea Graduate School of Nano IT Design Fusion Seoul National University of Science and Technology Seoul Republic of Korea R & D Center New Product Development team HANA Micron Inc Seongnam-Si Korea

The following topics are dealt with: integrated circuit reliability; integrated circuit packaging; wafer level packaging; copper; solders; integrated circuit interconnections; flip-chip devices; silicon; three-dimensi... 详细信息

ISBN: (纸本)9781538676691;9781538676684

关键词： Flip-chip devices Bonding Substrates Lasers Electronic packaging thermal management Silicon Stress

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Pathological grading of Hepatocellular Carcinomas in MrI using a LASSO algorithm

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Journal of Physics: Conference Series 2018年第1期1053卷

作者： Fei Gao Bin Yan Jian Chen Minghui Wu dapeng Shi National Digital Switching System Engineering & Technological R&D Center ZhengZhou Henan Province China Department of Radiology Henan General Hospital ZhengZhou Henan Province China

To investigate the predictive ability of radiomics signature for preoperative pathological grading of Hepatocellular Carcinomas (HCC), the no contrast MrI images were integrated and a comprehensive analysis was conducted to predict clinical outcomes using the radiomics features. Variable selection via LASSO and logistic regression were used to select the most-predictive radiomics features for the pathological grading. Cross-Validation with receiver operating characteristic (rOC) analysis was performed and the area under the rOC curve (AUC) was employed as the prediction metric. Overall, the prediction performances by radiomics features showed statistically significant correlations with pathological grading, however, improvement on the prediction performance by combining T1WI and T2WI data, classification performance obtained the AUC 0.829 in training dataset and the AUC 0.742 in validation dataset. This study consisted of 170 consecutive patients (training dataset: n=125; validation dataset, n=45). The results showed radiomics signature was developed and validated to be a significant predictor for discrimination HCC pathological grading, which may serve as a complementary tool for the preoperative tumour grading in HCC.

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Author Correction: Barriers and opportunities for resilient and sustainable urban forests

Nature Cities

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Nature Cities 2025年 1页

作者： Manuel Esperon-rodriguez rachael Gallagher renee M. Marchin Mark G. Tjoelker Carlo Calfapietra Paloma Cariñanos Cynnamon dobbs Ana Alice Eleuterio diego Esperon rodriguez Ali Jahani Elizaveta Litvak Stephen J. Livesley Gabriele Manoli Timon McPhearson Christian Messier Johan Östberg Henrik Sjöman Björn Wiström Lara A. roman Alessio russo Maryam Saffariha Charlie Shackleton Ingjerd Solfjeld Jonah Susskind Jens-Christian Svenning Natalie van doorn Jun Yang Hawkesbury Institute for the Environment Western Sydney University Penrith New South Wales Australia School of Science Western Sydney University Penrith New South Wales Australia Research Institute on Terrestrial Ecosystems National Research Council of Italy Porano Italy National Biodiversity Future Centre Palermo Italy Department of Botany Faculty of Pharmacy University of Granada Granada Spain Andalusian Institute for Earth System Research University of Granada (IISTA-CEAMA) Granada Spain Department of Natural Resources and the Environment University of Connecticut Storrs CT USA Instituto Latino-Americano de Economia Sociedade e Política Universidade Federal da Integração Latino-Americana Foz do Iguaçu Brazil Centro Universitario de Ciencias Sociales y Humanidades Universidad de Guadalajara Guadalajara Mexico Faculty of Assessment and Environment Risks Department Research Center of Environment and Sustainable Development Tehran Iran School of Sustainability Arizona State University Tempe AZ USA School of Agriculture Food and Ecosystem Sciences Faculty of Science The University of Melbourne Richmond Victoria Australia School of Architecture Civil and Environmental Engineering École Polytechnique Fédérale de Lausanne Lausanne Switzerland Urban Systems Lab The New School New York NY USA Cary Institute of Ecosystem Studies Millbrook NY USA Stockholm Resilience Centre Stockholm University Stockholm Sweden Département des Sciences Naturelles Institut des Sciences de la Forêt Tempérée Université du Québec en Outaouais Ripon Quebec Canada Centre d’Étude de la Forêt Université du Québec à Montréal Montreal Quebec Canada Department of Landscape Architecture Planning and Management Swedish University of Agricultural Sciences Alnarp Sweden Gothenburg Botanical Garden Gothenburg Sweden Royal Botanic Gardens Richmond UK Pacific Southwest Research Station USDA Forest Service Riverside CA USA School of Architecture and Built Environment Queensland

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Barriers and opportunities for resilient and sustainable urban forests

Nature Cities

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Nature Cities 2025年 1-9页

作者： Manuel Esperon-rodriguez rachael Gallagher renee M. Marchin Mark G. Tjoelker Carlo Calfapietra Paloma Cariñanos Cynnamon dobbs Ana Alice Eleuterio diego Esperon rodriguez Ali Jahani Elizaveta Litvak Stephen J. Livesley Gabriel Manoli Timon McPhearson Christian Messier Johan Östberg Henrik Sjöman Björn Wiström Lara A. roman Alessio russo Maryam Saffariha Charlie Shackleton Ingjerd Solfjeld Jonah Susskind Jens-Christian Svenning Natalie van doorn Jun Yang Hawkesbury Institute for the Environment Western Sydney University Penrith New South Wales Australia School of Science Western Sydney University Penrith New South Wales Australia Research Institute on Terrestrial Ecosystems National Research Council of Italy Porano Italy National Biodiversity Future Centre Palermo Italy Department of Botany Faculty of Pharmacy University of Granada Granada Spain Andalusian Institute for Earth System Research University of Granada (IISTA-CEAMA) Granada Spain Department of Natural Resources and the Environment University of Connecticut Storrs CT USA Instituto Latino-Americano de Economia Sociedade e Política Universidade Federal da Integração Latino-Americana Foz do Iguaçu Brazil Centro Universitario de Ciencias Sociales y Humanidades Universidad de Guadalajara Guadalajara Mexico Faculty of Assessment and Environment Risks Department Research Center of Environment and Sustainable Development Tehran Iran School of Sustainability Arizona State University Tempe AZ USA School of Agriculture Food and Ecosystem Sciences Faculty of Science The University of Melbourne Richmond Victoria Australia School of Architecture Civil and Environmental Engineering École Polytechnique Fédérale de Lausanne Lausanne Switzerland Urban Systems Lab The New School New York NY USA Cary Institute of Ecosystem Studies Millbrook NY USA Stockholm Resilience Centre Stockholm University Stockholm Sweden Département des Sciences Naturelles Institut des Sciences de la Forêt Tempérée Université du Québec en Outaouais Ripon Quebec Canada Centre d’Étude de la Forêt Université du Québec à Montréal Montreal Quebec Canada Department of Landscape Architecture Planning and Management Swedish University of Agricultural Sciences Alnarp Sweden Gothenburg Botanical Garden Gothenburg Sweden Royal Botanic Gardens Richmond UK Pacific Southwest Research Station USDA Forest Service Riverside CA USA School of Architecture and Built Environment Queensland

As cities heat up and expand in area and population, urban forests offer a nature-based solution to enhance liveability and reduce rising temperatures in cities. However, urban forests are vulnerable to climate change and face costly establishment and maintenance challenges. Here we explore four key ecological and socioeconomic barriers to achieving resilient urban forests: species selection, tree supply, tree life cycle (establishment and maintenance, including irrigation) and community engagement. We discuss how integrating traditional urban forestry practices with emerging technology offers a holistic approach to creating resilient, sustainable urban forests that can adapt to climate change while meeting community needs.

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