检索结果-内蒙古大学图书馆

第十七次中国暨国际生物物理大会

作者： Lin Liang Lihua Qu Wei Huang Kangkang Ma Wei Zhang Fuping Sun Hongrui Yuan Haitao Liu Zhongbo Yu State Key Laboratory of Medicinal Chemical Biology College of Pharmacy Nankai University College of Electronic Information and Optical Engineering Nankai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern Optics College of Electronic Information and Optical Engineering Nankai University

Enzymes of CXXC family bind DNA at CGIs to play essential roles in epigenetic regulation. However, the dynamic mechanism of how a CGI containing multiple CpG clusters recruits enzymes with conserved CXXC domains remains elusive. Here we show that CpG methylation affects dissociation rates of CXXC domains on a CGI in distinct modes.

关键词： CGI DNA Methylation Differentially Regulates Site-specific Dissociation of Conserved Epigenetic Enzymes on a CGI landscape

来源：评论

学校读者我要写书评

暂无评论

Automated Segmentation of Brain Gray Matter Nuclei on Quantitative Susceptibility Mapping Using Deep Convolutional Neural network

arXiv

引用

arXiv 2020年

作者： Chai, Chao Qiao, Pengchong Zhao, Bin Wang, Huiying Liu, Guohua Wu, Hong Haacke, E. Mark Shen, Wen Cao, Chen Ye, Xinchen Liu, Zhiyang Xia, Shuang Department of Medical Imaging Tianjin First Central Hospital Tianjin300192 China Tianjin Medical Imaging Institute Tianjin300192 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China Department of Radiology Wayne State University DetroitMI48202 United States Department of Medical Imaging Tianjin Huanhu Hospital Tianjin300350 China DUT-RU International School of Information Science and Engineering Dalian University of Technology Dalian116620 China

Abnormal iron accumulation in the brain subcortical nuclei has been reported to be correlated to various neurodegenerative diseases, which can be measured through the magnetic susceptibility from the quantitative susceptibility mapping (QSM). To quantitively measure the magnetic susceptibility, the nuclei should be accurately segmented, which is a tedious task for clinicians. In this paper, we proposed a double-branch residual-structured U-Net (DB-ResUNet) based on 3D convolutional neural network (CNN) to automatically segment such brain gray matter nuclei. To better tradeoff between segmentation accuracy and the memory efficiency, the proposed DB-ResUNet fed image patches with high resolution and the patches with low resolution but larger field of view into the local and global branches, respectively. Experimental results revealed that by jointly using QSM and T1 weighted imaging (T1WI) as inputs, the proposed method was able to achieve better segmentation accuracy over its single-branch counterpart, as well as the conventional atlas-based method and the classical 3D-UNet structure. The susceptibility values and the volumes were also measured, which indicated that the measurements from the proposed DB-ResUNet are able to present high correlation with values from the manually annotated regions of interest. Copyright © 2020, The Authors. All rights reserved.

关键词： Magnetic susceptibility

来源：评论

学校读者我要写书评

暂无评论

Automatic acute ischemic stroke lesion segmentation using semi-supervised learning

arXiv

引用

arXiv 2019年

作者： Zhao, Bin Wu, Hong Liu, Guohua Cao, Chen Jin, Song Liu, Zhiyang Ding, Shuxue Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical Engineering Nankai University Tianjin300071 China School of Artificial Intelligence Guilin University of Electronic Technology Guilin Guangxi541004 China Key Laboratory for Cerebral Artery and Neural Degeneration of Tianjin Department of Medical Imaging Tianjin Huanhu Hospital Tianjin300350 China

Ischemic stroke is a common disease in the elderly population, which can cause long-term disability and even death. However, the time window for treatment of ischemic stroke in its acute stage is very short. To fast localize and quantitively evaluate the acute ischemic stroke (AIS) lesions, many deep-learning-based lesion segmentation methods have been proposed in the literature, where a deep convolutional neural network (CNN) was trained on hundreds of fully labeled subjects with accurate annotations of AIS lesions. Despite that high segmentation accuracy can be achieved, the accurate labels should be annotated by experienced clinicians, and it is therefore very time-consuming to obtain a large number of fully labeled subjects. In this paper, we propose a semi-supervised method to automatically segment AIS lesions in diffusion weighted images and apparent diffusion coefficient maps. By using a large number of weakly labeled subjects and a small number of fully labeled subjects, our proposed method is able to accurately detect and segment the AIS lesions. In particular, our proposed method consists of three parts: 1) a double-path classification net (DPC-Net) trained in a weakly-supervised way is used to detect the suspicious regions of AIS lesions;2) a pixel-level K-Means clustering algorithm is used to identify the hyperintensive regions on the DWIs;and 3) a region-growing algorithm combines the outputs of the DPC-Net and the K-Means to obtain the final precise lesion segmentation. In our experiment, we use 460 weakly labeled subjects and 15 fully labeled subjects to train and fine-tune the proposed method. By evaluating on a clinical dataset with 150 fully labeled subjects, our proposed method achieves a mean dice coefficient of 0.639, and a lesion-wise F1 score of 0.799. Copyright © 2019, The Authors. All rights reserved.

关键词： Deep neural networks

来源：评论

学校读者我要写书评

暂无评论

Beidou B1I signal acquisition scheme based on variable length data accumulation

Beidou B1I signal acquisition scheme based on variable lengt...

引用

第九届中国卫星导航学术年会

作者： Menghuan Yang Guoping Wang Yingxin Zhao Hong Wu College of Electronic Information and Optical Engineering Nankai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology

The Neumann-Hoffman code is modulated in Beidou D1 navigation message,which increases the possibility of bit sign *** puts a constraint on the coherent integration duration for possible bit sign *** acquisition scheme of Beidou B1 I signal has been proposed in this ***,the carrier and sign bit code are deprived by delay and ***,the Doppler shift of the ranging code is *** to the Doppler shift of ranging code,the variable length of data block is accumulated to 1 ms ***,the ranging code phase is detected by FFT-based synchronized *** carrier frequency offset,whose boundary is determined by the Doppler shift of ranging code,is accurately estimated by means of chirp-z *** experiment shows that the method can achieve long-term coherent integration and improve the acquisition probability.

关键词： BDS acquisition bit sign transition Doppler shift chirp-z transform

来源：评论

学校读者我要写书评

暂无评论

Few-cycle near-infrared pulses from a narrowband cw injection-seeded femtosecond optical parametric amplifier

Few-cycle near-infrared pulses from a narrowband cw injectio...

引用

Ultrafast Optics 2017

作者： Fan, Jintao Gu, Chenglin Liu, Bo Wang, Chingyue Hu, Minglie Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Science and Technology of Ministry of Education College of Precision Instruments and Opto-electronics Engineering Tianjin University Tianjin300072 China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai200062 China Key Laboratory of Optical Information Science and Technology Ministry of Education Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern Optics Nankai University Tianjin300350 China

We demonstrated for the first time pulse coherent synthesis of a sub-nanometer-linewidth cw injection seeded femtosecond OPA. Pulse durations as short as 19.2 fs (3.9-cycle) at 1.47 μm are readily obtained. © 20... 详细信息

ISBN: (纸本)9781510617162

关键词： Optical parametric amplifiers

来源：评论

学校读者我要写书评

暂无评论

Analysis of base stations deployment on power saving for heterogeneous network 17

Analysis of base stations deployment on power saving for het...

引用

17th IEEE International Conference on Communication technology, ICCT 2017

作者： Lv, Yuanhong Zhang, Hui Xueming, Sui NanKai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin China

ISBN: (纸本)9781509039432

With the increasing of energy consumption in the wireless network, Heterogeneous network (HetNet) is used to improve the capability of communication networks, save transmitting power of base stations (BSs), enhance the coverage of communication network and so on. Designing an energy efficient network should not only consider the energy efficient operation of BSs, but also take the energy efficiency of mobile devices (MDs) into account. This paper considers the energy efficiency of BSs and MDs and studies the power saving of HetNet from a more comprehensive and systematic perspective. This paper mainly analyzes the deployment of a certain number of micro BSs in the region which has a certain number of macro BSs, and compares the power saving indicator at different radius of the micro BSs in three algorithms, which are that the region-based deployment algorithm, the grid-based deployment algorithm and the greedy BSs deployment algorithm. The greedy BSs deployment algorithm is used to determine the most suitable positions of micro BSs, in order to maximize the overall power saving indicator of the entire HetNet. © 2017 IEEE.

关键词： Heterogeneous networks

来源：评论

学校读者我要写书评

暂无评论

Electromagnetically induced transparency in terahertz metamaterial based on two-bright-mode resonator

引用

optoelectronics Letters 2017年第2期13卷 95-99页

作者：刘岩陈赛范飞陈猛白晋军王湘晖常胜江 Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Key Laboratory of Optical Information Science and TechnologyMinistry of EducationInstitute of Modern OpticsNankai University School of Electronics and Information Engineering Tianjin Polytechnic University

An electromagnetically induced transparency(EIT) in metamaterial resonator with two bright modes and one dark mode at the terahertz(THz) band is numerically and experimentally demonstrated. Different from two kinds of the traditional passive modulations, our design can realize the passive modulation of EIT phenomenon by adding another bright mode resonator. Simulated and experimental results show that the transmission peak varies for incident THz waves with different polarization directions due to its asymmetric structure, which provides a novel way to realize high efficiency switch and modulation.

关键词： resonator transparency bright terahertz adding directions switch asymmetric numerically strip

来源：评论

学校读者我要写书评

暂无评论

A Novel 1.03 ppm/°C Wide-Temperature-Range Curvature-Compensated Bandgap Voltage Reference

A Novel 1.03 ppm/°C Wide-Temperature-Range Curvature-Compen...

引用

International Conference on Circuits, System and Simulation (ICCSS)

作者： Jinlong Hu Jie Sun Yangbo Bai Huachao Xu Tao Du Guofeng Li Yao Chen Tianjin Complex System Control Theory and Application Key Laboratory Tianjin University of Technology Tianjin China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai University Tianjin China Advance Digital Sciences Center Singapore

ISBN: (纸本)9781538678206

This paper proposes a novel bandgap voltage reference with an accurate curvature compensation technique for completely compensating the thermal nonlinearity of the emitter-base voltage. With VIS 0.15 standard CMOS process, the proposed bandgap voltage reference circuit achieves temperature coefficient of 1.03 ppm/°C over the temperature range from -55°C to 155°C with the supply voltage of 1.8V. In addition, the circuit achieves line regulation performance of 0.02%/V with the supply voltage from 1.8V to 3V and the power supply rejection (PSR) levels are 83dB, 77dB, 58dB at ultra-low frequency (

关键词： Photonic band gap Temperature Temperature dependence Resistors Transistors Voltage control Low voltage

来源：评论

学校读者我要写书评

暂无评论

Correction to: Underwater image enhancement using an edge-preserving filtering Retinex algorithm

引用

Multimedia Tools and Applications 2020年第25期79卷 17279-17279页

作者： Peixian Zhuang Xinghao Ding Jiangsu Key Laboratory of Meteorological Observation and Information Processing Jiangsu Technology and Engineering Center of Meteorological Sensor Network School of Electronic and Information Engineering Nanjing University of Information Science and Technology Nanjing China Fujian Key Laboratory of Sensing and Computing for Smart City School of Information Science and Engineering Xiamen University Xiamen China

In the original publication, Equations were incorrectly presented. The original article has been corrected.

关键词：

来源：评论

学校读者我要写书评

暂无评论

High-precision two-way time transfer system via long-distance commercial fiber link

引用

optoelectronics Letters 2017年第6期13卷 427-431页

作者：慈骋赵迎新吴虹刘波章学松张瑜 Institute of Electronic Information and Optical Engineering Nankai University Tianjin 300071 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai University Tianjin 300071 China Key Laboratory of Optical Information Science and Technology Ministry of Education Nankai University Tianjin 300071 China

Time synchronization techniques, especially on the pulse per second(PPS) temporal basis, have attracted growing research interests in recent years. In this paper, we have proposed and experimentally demonstrated a high-precision two-way time transfer(TWTT) system to realize long-distance dissemination of 1 PPS signal generated by a hydrogen maser. A dense-wavelength-division-multiplexing(DWDM) system and bi-directional erbium-doped fiber amplifiers(Bi-EDFAs) have also been adopted to suppress the impact of Rayleigh backscattering and optimize the signal to noise ratio(SNR) as well. We have theoretically analyzed the systematic delay in detail. The ultimate root mean square(RMS) variation of time synchronization accuracy is sub-26 ps and the time deviation can be reduced to as low as 1.2 ps at 100 s and 0.253 ps at 12 000 s, respectively.

关键词： dissemination multiplexing directional deviation ultimate Rayleigh dense suppress have instrumental

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：