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考虑风光出力不确定性及相关性的配电网规划方法

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现代电力 2024年第2期41卷 318-325页

作者：张颖艾欣华北电力大学电气与电子工程学院北京市昌平区102206

新能源在电力系统中的渗透率日益提高,大大增加了电网中的不确定因素,对配电网的规划运行和控制提出了更高的要求。配电网规划是电力系统安全稳定运行的重要基石,传统配电网规划中各参数都已确定,缺乏对不确定因素的适应性。因此,提出... 详细信息

新能源在电力系统中的渗透率日益提高,大大增加了电网中的不确定因素,对配电网的规划运行和控制提出了更高的要求。配电网规划是电力系统安全稳定运行的重要基石,传统配电网规划中各参数都已确定,缺乏对不确定因素的适应性。因此,提出一种基于概率潮流的配电网规划方法,首先对配电网中的不确定因素定量建模,建立源荷出力模型,其次将风速、太阳辐射与用电负荷之间的相关性用秩相关系数矩阵表征,建立计及相关性的半不变量概率潮流计算方法,最后构建以规划成本最小为目标函数,以潮流平衡、馈线容量、节点电压、网架辐射型结构为约束条件的配电网规划模型,并通过改进惯性参数与引入变异操作对粒子群算法进行改进,利用改进后的算法求解规划模型。以33节点系统为例进行仿真,结果验证了该方法能够有效降低网损,减少网络规划费用。

关键词：配电网规划不确定性相关性概率潮流粒子群算法

A Practical Approach to Resolving Combination Ambiguity in Chinese Word Segmentation

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A Practical Approach to Resolving Combination Ambiguity in C...

第八届国际信号处理国际会议

作者： ying Qin Suxiang zhang Xiaojie Wang school of Information engineering beijing university of posts and telecommunications beijing 100876 Department of electronic and Communication engineering of North china Electric Power university Baoding 071003

＜正＞In Chinese word segmentation task, combination ambiguity is one of challenges not being well settled. The main obstacle exists in the detection of ambiguous words in given texts and their proper segmentations. This paper puts forward a practical approach to automatically collecting ambiguous words and disambiguating based on Maximum Entropy principle. The experimental result reveals the approach of automatic collection ambiguous words can detect combination ambiguity effectively avoiding arduous manual work. As to the disambiguation based on Maximum Entropy, we investigate new features grounded on prior and contextual knowledge and achieve promising result.

关键词：

Course Group Development of Fundamental courses forelectronics and Information Based on engineering Education

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Course Group Development of Fundamental courses forElectroni...

教育部中南地区高等学校电子电气基础课教学研究会第二十届学术年会

作者： Zu Yun-xiao,Wang Wei-dong,zhang Jian-ming,lIU li-hua,Ren Wei-zheng (school of electronic engineering,beijing university of posts & telecommunications,beijing 100876,china)

During the college education the courses of fundamentals for every subject have a very important status in the knowledge framework of students’ *** study on contents and teaching methods and measures of the four fundamental courses for electronics and Information,which are ’Fundamentals of Circuit Analysis’,’Signals and Systems’,’Fundamentals of electronic Circuits’,’Digital Circuit and logic Design’,is introduced based on engineering education in this *** study on contents includes the optimization of courses’ contents,complementarity and strengthening between theory and experiment, combination of theory and engineering,and the hierarchical *** study on teaching methods and measures includes the change of teachers’ teaching notion and the training of the students’ ability in ideation, innovation,synthesis,induction,simulation and practice.

关键词： engineering education course group electronics and information professional fundamental courses

Iterative Signal Detection Based Soft Interference Cancellation for Satellite-Terrestrial Downlink NOMA Systems

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china Communications 2024年第8期21卷 249-263页

作者： Sun Meng zhang Qi Yao Haipeng Gao Ran xin Xiangjun Tian Feng Feng Weiying Chen Dong school of electronic engineering Beijing University of Posts and Telecommunications(BUPT)Beijing 100876China beijing Key laboratory of Space-Ground Interconnection and Convergence State Key Laboratory of Information Photonics and Optical CommunicationsSchool of Electronic EngineeringBeijing University of Posts and Telecommunications(BUPT)Beijing 100876China school of Information and Communication engineering Beijing University of Posts and Telecommunications(BUPT)Beijing 100876China beijing Institute of Technology Beijing 100081China Beihang university Beijing 100191China china Academy of Space Technology(CAST) Beijing 100094China

To improve the bit error rate(BER)performance of multi-user signal detection in satelliteterrestrial downlink non-orthogonal multiple access(NOMA)systems,an iterative signal detection algorithm based on soft interference cancellation with optimal power allocation is *** that power allocation has a significant impact on BER performance,the optimal power allocation is obtained by minimizing the average BER of NOMA *** to the allocated powers,successive interference cancellation(SIC)between NOMA users is performed in descending power *** each user,an iterative soft interference cancellation is performed,and soft symbol probabilities are calculated for soft *** improve detection accuracy and without increasing the complexity,the aforementioned algorithm is optimized by adding minimum mean square error(MMSE)signal estimation before detection,and in each iteration soft symbol probabilities are utilized for soft-decision of the current user and also for the update of soft interference of the previous *** results illustrate that the optimized algorithm ***-IDBSIC significantly outperforms joint multi-user detection and SIC detection by 7.57dB and 8.03dB in terms of BER performance.

关键词： non-orthogonal multiple access(NOMA) resource allocation satellite-terrestrial communication signal detection soft interference cancellation

A Novel Improved AODV Algorithm Based on Cross-layer Mechanism in Wireless Mesh Network

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A Novel Improved AODV Algorithm Based on Cross-Layer Mechani...

2006 the IET International Conference on Wireless Mobile & Multimedia Networks

作者： Da Guo ying luo Mei Song Junde Song PCN & CAD Center school of electronic engineering beijing university of posts and telecommunications No.10 Xitucheng Road 100876 beijing china

＜正＞Wireless mesh networks （WMNs） suffer from random variations in channel condition. This leads to poor performance in multi-hop wireless mesh networks specially with a conventional routing. To cope with instability of wireless links, new routing metrics must be explored. In this paper we propose a new end-to-end Bit Error Rate （BER） aware metric for multi-hop wireless routing and take hop number into account. We show that using this metric in AODV protocol improves the performance of routing in terms of end-to-end delay and throughput in comparison to minimum-hop count metric.

关键词： Wireless Mesh Network (WMN) Ad-hoc on-demand distance vector (AODV) routing cross-layer design

D-band 4600 m wireless transmission with rates exceeding 100 Gbit/s based on photonics aided technologies

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Science china(Technological Sciences) 2024年第9期67卷 2968-2970页

作者： ZHAO XianMing YU JianJun yang XiongWei WEI Yi lI WeiPing TAN JingWen WANG MingXu zhang QiuTong zhang Bing BIAN ChengZhen TIAN Peng HAN yang zhang QingYi YU JianGuo ZHAO Feng Harbin Institute of Technology Harbin 150001China Key laboratory for Information Science of Electromagnetic Waves Fudan UniversityShanghai 200433China school of electronic engineering Beijing University of Posts and TelecommunicationsBeijing 100876China school of Automation Xi’an University of Posts and TelecommunicationsXi’an 710121China

With the rise of emerging applications such as artificial intelligence(AI),virtual reality(VR), and short videos, the number of Internet terminals has increased dramatically [1]. According to the Cisco Annual Traffic Survey Report, annual traffic is growing at a compound annual growth rate of 20%[2]. To meet exploding growth in traffic demands, researchers have turned their attention to license-free high-band millimeter wave(MMW), such as W-band(75–110 GHz), D-band(110–170 GHz), and terahertz band(THz) [3,4].

关键词： millimeter exceeding artificial

Interpretable Machine learning-Assisted High-Throughput Screening for Understanding NRR Electrocatalyst Performance Modulation between Active Center and C-N Coordination

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Energy & Environmental Materials 2024年第5期7卷 267-275页

作者： Jinxin Sun Anjie Chen Junming Guan ying Han Yongjun liu Xianghong Niu Maoshuai He li Shi Jinlan Wang Xiuyun zhang College of Physics Science and Technology Yangzhou University State Key laboratory of Organic electronics and Information Displays (KlOEID) & Institute of Advanced Materials (IAM) School of Science Nanjing University of Posts and Telecommunications College of Chemistry and Molecular engineering Qingdao University of Science and Technology school of Physics & Key laboratory of Quantum Materials and Devices Ministry of Education Southeast University

Understanding the correlation between the fundamental descriptors and catalytic performance is meaningful to guide the design of high-performance electrochemical catalysts. However, exploring key factors that affect catalytic performance in the vast catalyst space remains challenging for people. Herein,to accurately identify the factors that affect the performance of N2reduction,we apply interpretable machine learning （Ml） to analyze high-throughput screening results, which is also suited to other surface reactions in catalysis. To expound on the paradigm, 33 promising catalysts are screened from 168carbon-supported candidates, specifically single-atom catalysts （SACs）supported by a BC3monolayer (TM@VB/C-Nn=0-3-BC3) via high-throughput screening. Subsequently, the hybrid sampling method and XGBoost model are selected to classify eligible and non-eligible catalysts. Through feature interpretation using Shapley Additive Explanations （SHAP） analysis, two crucial features, that is, the number of valence electrons （Nv） and nitrogen substitution （N_n）, are screened out. Combining SHAP analysis and electronic structure calculations, the synergistic effect between an active center with low valence electron numbers and reasonable C-N coordination （a medium fraction of nitrogen substitution） can exhibit high catalytic performance. Finally, six superior catalysts with a limiting potential lower than-0.4 V are predicted.

关键词： electrochemical nitrogen reduction feature engineering high-throughput screening machine learning

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多功能虚拟仪器的设计与实现

数据采集与处理 2009年第B10期24卷 254-260页

作者：张雨超崔岩松陈晶朱丹北京邮电大学电子工程学院北京100876

介绍了多功能虚拟仪器的设计实现,系统采用高速AD和FPGA实现虚拟示波器,高速DA和FPGA实现虚拟信号源,并通过具有U SB功能的单片机CY 78C 68013A实现FPGA与主机之间的数据通信。测试数据表明,该系统实现了虚拟示波器、信号源的功能,该虚... 详细信息

介绍了多功能虚拟仪器的设计实现,系统采用高速AD和FPGA实现虚拟示波器,高速DA和FPGA实现虚拟信号源,并通过具有U SB功能的单片机CY 78C 68013A实现FPGA与主机之间的数据通信。测试数据表明,该系统实现了虚拟示波器、信号源的功能,该虚拟仪器已成功应用于电子技术基础远程实验教学系统中。

关键词：虚拟示波器虚拟信号源 FPGA

消除与WlAN同频干扰的UWB正交成形脉冲序列设计

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武汉大学学报（理学版） 2005年第S2期51卷 61-63页

作者：张洪欣吕英华贺鹏飞王野秋北京邮电大学电子工程学院北京100876

提出了产生避免与WlAN同频干扰的UWB正交成形脉冲序列方法,并到了期望的正交成形脉冲序列.仿真结果表明,利用这种方法产生的UWB瞬时成形脉冲的功率谱密度分布符合FCC频谱规定的要求,具有很高的频谱利用率,既可以降低用户间干扰,又解决了... 详细信息

提出了产生避免与WlAN同频干扰的UWB正交成形脉冲序列方法,并到了期望的正交成形脉冲序列.仿真结果表明,利用这种方法产生的UWB瞬时成形脉冲的功率谱密度分布符合FCC频谱规定的要求,具有很高的频谱利用率,既可以降低用户间干扰,又解决了UWB与窄带系统同频干扰的问题,可以提高系统的发射功率.

关键词：超宽带(UWB)技术成形脉冲功率谱密度(PSD) 同频干扰