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基于全局依赖Transformer的图像超分辨率网络

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计算机应用 2024年第5期44卷 1588-1596页

作者：刘子涵周登文刘玉铠华北电力大学控制与计算机工程学院北京102206

目前,基于深度学习的图像超分辨网络主要由卷积实现。相较于传统的卷积神经网络(CNN),Transformer在图像超分辨率任务中的主要优势是它的长距离依赖建模能力;然而大多数基于Transformer的图像超分辨率模型在参数量小、网络层数少的情况... 详细信息

目前,基于深度学习的图像超分辨网络主要由卷积实现。相较于传统的卷积神经网络(CNN),Transformer在图像超分辨率任务中的主要优势是它的长距离依赖建模能力;然而大多数基于Transformer的图像超分辨率模型在参数量小、网络层数少的情况下无法建立全局依赖,限制了模型的性能。为了在超分辨率网络中建立全局依赖,提出了基于全局依赖Transformer的图像超分辨率网络(GDTSR),主要组成部分为残差方形轴向窗口块(RSAWB),它的内部轴向窗口Transformer残差层利用轴向窗口和自注意力,可以使每个像素与整个特征图建立起全局依赖。此外,目前大多数图像超分辨率模型的超分辨率图像重建模块都由卷积组成,为了动态整合提取到的特征信息,结合Transformer与卷积,共同重建超分辨率图像。实验结果表明,GDTSR在5个标准测试集Set5、Set14、B100、Urban100和Manga109上的测试结果中,3个倍数(×2,×3,×4)的峰值信噪比(PSNR)和结构相似性(SSIM)均达到了最优,特别是在大尺寸图像的Urban100和Manga109数据集上模型性能的提升尤为明显。

关键词：图像超分辨率 Transformer 自注意力全局依赖轴向窗口

Capacity Analysis and Sum Rate Maximization for the SCMA Cellular Network Coexisting with D2D Communications

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China Communications 2022年第10期19卷 55-68页

作者： yukai liu Wen Chen Shanghai Institute of Advanced Communications and Data Sciences Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Sparse code multiple access (SCMA) is the most concerning scheme among non-orthogonal multiple access (NOMA) technologies for 5G wireless communication new interface. Another efficient technique in 5G aimed to improve spectral efficiency for local communications is device-to-device (D2D) communications. Therefore, we utilize the SCMA cellular network coexisting with D2D communications for the connection demand of the Internet of things (IOT), and improve the system sum rate performance of the hybrid network. We first derive the information-theoretic expression of the capacity for all users and find the capacity bound of cellular users based on the mutual interference between cellular users and D2D users. Then we consider the power optimization problem for the cellular users and D2D users jointly to maximize the system sum rate. To tackle the non-convex optimization problem, we propose a geometric programming (GP) based iterative power allocation algorithm. Simulation results demonstrate that the proposed algorithm converges fast and well improves the sum rate performance.

关键词： SCMA D2D cellular capacity geometric programming

腹腔镜胆囊切除术治疗急性结石性胆囊炎的效果分析

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中国社区医师 2024年第3期40卷 52-54页

作者：杨宇宋浩文刘宇开刘亮玉林市红十字会医院广西壮族自治区玉林537000

目的:分析腹腔镜胆囊切除术治疗急性结石性胆囊炎的效果。方法:选取2020年1月—2023年1月玉林市红十字会医院收治的60例急性结石性胆囊炎患者作为研究对象,随机分为对照组与观察组,各30例。对照组采取开腹胆囊切除术治疗,观察组采取腹... 详细信息

目的:分析腹腔镜胆囊切除术治疗急性结石性胆囊炎的效果。方法:选取2020年1月—2023年1月玉林市红十字会医院收治的60例急性结石性胆囊炎患者作为研究对象,随机分为对照组与观察组,各30例。对照组采取开腹胆囊切除术治疗,观察组采取腹腔镜胆囊切除术治疗。比较两组治疗效果。结果:观察组肠鸣音恢复时间、首次排气时间早于对照组,差异有统计学意义(P0.05);术后24 h,两组GAS、MTL水平低于手术前,但观察组高于对照组,两组CRP、IL-8水平均低于手术前,且观察组低于对照组,差异有统计学意义(P0.05);术后3 d,两组疼痛分级指数、视觉模拟评分法、现实疼痛强度评分低于手术前,且观察组低于对照组,差异有统计学意义(P<0.05)。观察组不良反应发生率低于对照组,差异有统计学意义(P=0.030)。结论:腹腔镜胆囊切除术治疗急性结石性胆囊炎的效果较好,患者胃肠功能恢复快,炎性反应及疼痛程度轻,术后不良反应发生率低。

关键词：急性结石性胆囊炎腹腔镜胆囊切除术胃肠功能

Study on site selection planning of urban electric vehicle charging station

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High Technology Letters 2024年第1期30卷 75-84页

作者：刘娜 CHENG Jiaxin DUAN yukai School of Business Shanghai Dianji UniversityShanghai201306 P.R.China

The large-scale development of electric vehicles(EVs)requires numerous charging stations to serve them,and the charging stations should be reasonably laid out and planned according to the charging demand of electric *** the costs of both operators and users,a site selection model for optimal layout planning of charging stations is constructed,and a queuing theory approach is used to determine the charging pile configuration to meet the charging demand in the planning *** solve the difficulties of particle swarm global optimization search,the improved random drift particle swarm optimization(IRDPSO)and Voronoi diagram are used to jointly solve for the optimal layout of electric *** final arithmetic analysis verifies the feasibility and practicality of the model and algorithm,and the results show that the total social cost is minimized when the charging station is 9,the location of the charging station is close to the center of gravity and the layout is reasonable.

关键词： charging station electric vehicle(EV) improved random drift particle swarm optimization(IRDPSO) optimal planning

Experimental study of core and edge fluctuations by reflectometry on EAST tokamak

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Plasma Science and Technology 2021年第7期23卷 8-14页

作者： Zhen ZHOU Tao ZHANG Mingfu WU Kaixuan YE Fubin ZHONG Jia HUANG Kangning GENG yukai liu Gongshun LI Haoming XIANG Yumin WANG Fei WEN Sanqiu liu Jiangxi Province Key Laboratory of Fusion and Information Control Institute of Fusion Energy and Plasma ApplicationDepartment of PhysicsNanchang UniversityNanchang 330031People’s Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People’s Republic of China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 5180602People’s Republic of China

An eight-channel poloidal correlation reflectometer(PCR)with O-mode polarization has been installed in the EAST tokamak to measure the fluctuations from core to *** PCR launches eight different frequency microwaves(20.4,24.8,33,40,42.4,48,52.6,57.2 GHz)into the plasma from the low field side and two poloidally separated antennae are used to receive the reflected *** a result,the diagnostic can measure fluctuations in eight(radial)×two(poloidal)spatial *** diagnostic has been applied to study the core and edge pedestal fluctuations during an inter-ELM phase in H-mode *** inter-ELM phase can be divided into two *** the first stage,a low frequency(<50 kHz)broadband fluctuation dominates in the pedestal gradient *** the second stage,this fluctuation is strongly suppressed and quasi-coherent fluctuations(QCFs)*** QCF’s amplitude increases with the pedestal density gradient,implying density gradient driven *** the core fluctuations inside the pedestal show no evident changes during the inter-ELM phase.

关键词： core fluctuation edge fluctuation reflectometry

Research on the Three-phase Photovoltaic Grid-connected Control Strategy

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Energy and Power Engineering 2013年第4期5卷 31-35页

作者： yukai liu Zhijian Hu Ziyong Zhang Jianglei Suo Kaibin Liang School of Electrical Engineering Wuhan University Wuhan China

This paper mainly studies scheduling type photovoltaic generation system, and establishes a three-phase photovoltaic grid-connected model in Matlab/Simulink, which uses the MPPT control that can make full use of the solar energy. At the same time, energy storage device is added. The inverter of the energy storage device adopts V/f control. In the running state of the islanding because of a certain power failure, it can maintain a constant voltage and frequency. The simulation shows that as the output of the photovoltaic power increases, harmonic rate decreases under the same conditions, and the energy storage device can increase the stability of photovoltaic grid and reduce harmonic contents. So it’s very necessary to add energy storage device in the photovoltaic system.

关键词： Photovoltaic Grid Energy Storage Device PQ Control V/f Control Harmonic Rate

《故乡》的“小说学”密码——鲁迅《故乡》艺术设计解析

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现代中文学刊 2021年第4期 32-37页

作者：刘玉凯河北大学文学院

本论文从解读鲁迅小说《故乡》本文出发,阐释小说的叙事背后的思想意义与相关的艺术设计,主要论述作家的"走出"的生命意义与文化内涵。

关键词：鲁迅《故乡》走出艺术密码

Wide-Area Delay-Dependent Adaptive Supervisory Control of Multi-machine Power System Based on Improve Free Weighting Matrix Approach

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Energy and Power Engineering 2013年第4期5卷 435-441页

作者： Ziyong Zhang Zhijian Hu yukai liu Yang Gao He Wang Jianglei Suo Jiangsu Suzhou Power Supply Company STATE GRID Corporation of China Suzhou China School of Electrical Engineering Wuhan University Wuhan China School of Electrical Engineering Wuhan University Wuhan China.

The paper demonstrates the possibility to enhance the damping of inter-area oscillations using Wide Area Measurement (WAM) based adaptive supervisory controller (ASC) which considers the wide-area signal transmission delays. The paper uses an LMI-based iterative nonlinear optimization algorithm to establish a method of designing state-feedback controllers for power systems with a time-varying delay. This method is based on the delay-dependent stabilization conditions obtained by the improved free weighting matrix (IFWM) approach. In the stabilization conditions, the upper bound of feedback signal’s transmission delays is taken into consideration. Combining theoriesof state feedback control and state observer, the ASC is designed and time-delay output feedback robust controller is realized for power system. The ASC uses the input information from Phase Measurement Units (PMUs) in the system and dispatches supplementary control signals to the available local controllers. The design of the ASC is explained in detail and its performance validated by time domain simulations on a New England test power system (NETPS).

关键词： Adaptive Supervisory Controller (ASC) Delay-dependent Damping Control Power Oscillation IFWM LMI Free Weighting Matrix Approach Time-varying Delay WAMS

Translocation of telomerase reverse transcriptase coincided with ATP release in postnatal cochlear supporting cells

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Neural Regeneration Research 2024年第5期19卷 1119-1125页

作者： yukai Zhang Keyong Tian Wei Wei Wenjuan Mi Fei Lu Zhenzhen liu Qingwen Zhu Xinyu Zhang Panling Geng Jianhua Qiu Yongli Song Dingjun Zha Department of Otolaryngology Xijing HospitalFourth Military Medical UniversityXi’anShaanxi ProvinceChina

The spontaneous bursts of electrical activity in the developing auditory system are derived from the periodic release of adenosine triphosphate(ATP)by supporting cells in the Kölliker’s ***,the mechanisms responsible for initiating spontaneous ATP release have not been *** previous study revealed that telomerase reverse transcriptase(TERT)is expressed in the basilar membrane during the first postnatal *** role in cochlear development remains *** this study,we investigated the expression and role of TERT in postnatal cochlea supporting *** results revealed that in postnatal cochlear Kölliker’s organ supporting cells,TERT shifts from the nucleus into the cytoplasm over *** found that the TERT translocation tendency in postnatal cochlear supporting cells in vitro coincided with that observed in *** analysis showed that TERT in the cytoplasm was mainly located in mitochondria in the absence of oxidative stress or apoptosis,suggesting that TERT in mitochondria plays roles other than antioxidant or anti-apoptotic *** observed increased ATP synthesis,release and activation of purine signaling systems in supporting cells during the first 10 postnatal *** phenomenon that TERT translocation coincided with changes in ATP synthesis,release and activation of the purine signaling system in postnatal cochlear supporting cells suggested that TERT may be involved in regulating ATP release and activation of the purine signaling *** study provides a new research direction for exploring the spontaneous electrical activity of the cochlea during the early postnatal period.

关键词： apoptosis ATP release Ca2+transients cochlea mitochondrial function reactive oxygen species spontaneous electrical activity supporting cells