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Complex field network-coded cooperation based on multi-user detection in wireless networks 认领 引用 被引量:2
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作者 Jing Wang Xiangyang Liu +1 位作者 Kaikai Chi Xiangmo Zhao 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2013年第2期215-221,共7页
Cooperative communication can achieve spatial diversity gains,and consequently combats signal fading due to multipath propagation in wireless networks powerfully.A novel complex field network-coded cooperation(CFNCC... Cooperative communication can achieve spatial diversity gains,and consequently combats signal fading due to multipath propagation in wireless networks powerfully.A novel complex field network-coded cooperation(CFNCC) scheme based on multi-user detection for the multiple unicast transmission is proposed.Theoretic analysis and simulation results demonstrate that,compared with the conventional cooperation(CC) scheme and network-coded cooperation(NCC) scheme,CFNCC would obtain higher network throughput and consumes less time slots.Moreover,a further investigation is made for the symbol error probability(SEP) performance of CFNCC scheme,and SEPs of CFNCC scheme are compared with those of NCC scheme in various scenarios for different signal to noise ratio(SNR) values. 展开更多
关键词 network coding complex field wireless network cooperative communication multi-user detection
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A Low Complexity VCS Method for PAPR Reduction in Multicarrier Code Division Multiple Access 认领 引用
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作者 Si-Si Liu Yue Xiao Qing-Song Wen Shao-Qian Li 《Journal of Electronic Science and Technology of China》 2007年第2期102-106,共5页
This paper investigates a peak to average power ratio (PAPR) reduction method in multicarrier code division multiple access (MC-CDMA) system. Variable code sets (VCS), a spreading codes selection scheme, can imp... This paper investigates a peak to average power ratio (PAPR) reduction method in multicarrier code division multiple access (MC-CDMA) system. Variable code sets (VCS), a spreading codes selection scheme, can improve the PAPR property of the MC-CDMA signals, but this technique requires an exhaustive search over the combinations of spreading code sets. It is observed that when the number of active users increases, the search complexity will increase exponentially. Based on this fact, we propose a low complexity VCS (LC-VCS) method to reduce the computational complexity. The basic idea of LC-VCS is to derive new signals using the relationship between candidature signals. Simulation results show that the proposed approach can reduce PAPR with lower comtational pucomplexity. In addition, it can be blindly received without any side information. 展开更多
关键词 Low complexity variable code sets,multicarrier code division multiple access (MC-CDMA),peak to average power ratio variable code sets.
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一套实用的企业应用分析框架CODE 认领 引用
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作者 姚富士 《信息技术与标准化》 2025年第1期53-57,共5页
随着企业信息化的深入,众多应用不再是“孤岛”,而是形成体系,应用间集成度越来越高,与业务的融合不断加深。在这种大趋势下,企业信息化在具体应用落地时要充分考虑其在企业体系中的定位,基于业务和技术环境找准发力点,才能最大化应用... 随着企业信息化的深入,众多应用不再是“孤岛”,而是形成体系,应用间集成度越来越高,与业务的融合不断加深。在这种大趋势下,企业信息化在具体应用落地时要充分考虑其在企业体系中的定位,基于业务和技术环境找准发力点,才能最大化应用的价值。提出一套用于企业应用分析框架CODE,该分析框架由目标、业务上下文、系统上下文、领域、数据、分布、发展、接口、交互等要素构成,并充分考虑了企业环境的复杂性。经验证,该应用框架能够较好地完成应用分析,助力企业更好地进行应用建设。 展开更多
关键词 企业信息化 复杂性 分析框架 CODE
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面向短包通信的PAC码低复杂度序贯译码算法 认领 引用 被引量:1
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作者 戴景鑫 尹航 +4 位作者 王玉环 吕岩松 杨占昕 吕锐 夏治平 《电子与信息学报》 EI CAS CSCD 北大核心 2026年第1期86-97,共12页
随着智能物联网的出现,海量物联网设备间的短包通信在低时延、高可靠和极短数据包长方面的严苛要求给信道编译码方案的设计带来了新的挑战。极化调整卷积(PAC)码在短码长下的某些码型下具有接近散度近似(DA)的纠错性能,但其极高的译码... 随着智能物联网的出现,海量物联网设备间的短包通信在低时延、高可靠和极短数据包长方面的严苛要求给信道编译码方案的设计带来了新的挑战。极化调整卷积(PAC)码在短码长下的某些码型下具有接近散度近似(DA)的纠错性能,但其极高的译码运算复杂度限制了在短包通信中的应用。针对这一问题,该文提出了低复杂度Fano序贯(LC-FS)译码算法和低复杂度堆栈(LC-S)译码算法。首先,LC-FS译码算法将译码码树中的特殊节点分为低码率和高码率两类,并提出了相应的特殊节点译码器和回溯策略,从而在译码码树更高层完成译码以避免冗余运算。其次,LC-FS译码算法中的特殊节点分类方法被扩展到堆栈类译码算法,进一步提出了LC-S译码算法。该算法在保留堆栈类译码算法低回溯次数特点的同时具有更低的运算复杂度。最后,仿真结果表明在对码长为256和信息长度为128的PAC码进行译码时,相较于快速Fano序贯(FFS)译码算法和传统堆栈译码算法,所提LC-FS译码算法和LC-S译码算法在保证纠错性能基本无损的同时运算复杂度平均降低了13.77%和56.48%。 展开更多
关键词 短包通信 PAC码 低复杂度 序贯译码 特殊节点
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Predicting Software Security Bugs Using Machine Learning and Quality Metrics: An Empirical Study 认领 引用
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作者 Mohamed Diouf Elisée Toe +2 位作者 Manel Grichi Haïfa Nakouri Fehmi Jaafar 《Computers, Materials & Continua》 SCIE EI 2026年第6期436-477,共42页
Software security bugs present significant security risks to modern systems,leading to unauthorized access,data breaches,and severe operational and financial consequences.Early prediction of such vulnerabilities is th... Software security bugs present significant security risks to modern systems,leading to unauthorized access,data breaches,and severe operational and financial consequences.Early prediction of such vulnerabilities is therefore essential for strengthening software reliability and reducing remediation costs.This study investigates the extent to which static software quality metrics can identify vulnerable code and evaluates the effectiveness of machine learning models for large-scale security-bug prediction.We analyze a dataset of 338,442 source files,including 33,294 buggy files,collected from seven major open-source ecosystems.These ecosystems include GitHub Security Advisories(GHSA),Python Package Index(PyPI),OSS-Fuzz(Google’s open-source fuzzing service),Node Package Manager(npm),Packagist(the PHP package repository),Apache Maven,and NuGet(the.NET package manager).Using the Open Source Vulnerabilities(OSV)platform,we identify 7685 confirmed security bugs and extract 25 static software quality metrics per file with the Understand analysis tool.We apply five complementary feature-importance techniques and evaluate eleven machine-learning classifiers under a time-series cross-validation protocol.Our analysis reveals three key findings.First,six core metrics consistently show strong associations with the presence of security bugs across all feature-selection methods.Second,buggy files exhibit substantially higher metric values,with medians approximately three times those of non-buggy files,a pattern we term the“3×rule”;Mann-Whitney U tests confirm that these differences are statistically significant.Third,the machine-learning models achieve strong predictive performance,with XGBoost providing the best results(recall=0.82,precision=0.95,Receiver Operating Characteristic-Area Under the Curve(ROC-AUC)=0.91).Based on these findings,we propose data-driven warning and critical thresholds for the most influential metrics to support proactive security assessment.Overall,this work provides large-scale empirical evidence that software quality metrics,combined with machine learning,offer actionable signals for detecting security bugs and for integrating automated vulnerability prediction into software development workflows. 展开更多
关键词 Security bugs vulnerability prediction software metrics machine learning code complexity software quality
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OBCC:后摩尔时代E级计算编程墙的一种估计方法 认领 引用
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作者 张晓哲 陈涛 +3 位作者 肖调杰 张翔 包为民 龚春叶 《计算机工程与科学》 CSCD 北大核心 2026年第1期20-27,共8页
后摩尔时代的E级计算面临的编程墙缺乏衡量标准。代码复杂度作为软件代码的内在属性,是代码理解、优化和计价的基础。针对现有的代码复杂度衡量方法在HPC应用中存在局限性的问题,提出了基于操作符数目和代码行数的代码绝对复杂度和相对... 后摩尔时代的E级计算面临的编程墙缺乏衡量标准。代码复杂度作为软件代码的内在属性,是代码理解、优化和计价的基础。针对现有的代码复杂度衡量方法在HPC应用中存在局限性的问题,提出了基于操作符数目和代码行数的代码绝对复杂度和相对复杂度,其中绝对复杂度为代码操作符总数,相对复杂度为绝对复杂度与代码行数的比值。通过43个软件代码的实验验证,该方法能够合理评估不同类型代码的复杂度,特别是在科学计算领域。其中llvm和linux内核分别以3300万和2300万的绝对复杂度位列前两位;jellyfin-media-player,spheral和llvm则以4.54,3.9和3.12的相对复杂度排名前3位。该方法为不同代码的分析、比较和计价提供了新视角,也为E级计算编程墙的衡量提供了一种客观、可量化的标准。 展开更多
关键词 高性能计算 代码复杂度 绝对复杂度 相对复杂度 操作符计量
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法律如何回应“系统”——《生态环境法典》的方法论探索 认领 引用 被引量:4
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作者 吴瑶 《求是学刊》 CSSCI 北大核心 2026年第1期120-134,共15页
《生态环境法典(草案二次审议稿)》将“生态系统”确立为保护对象,其制度探索可概括为“识别-回应”框架:通过识别技术将系统确立为法律对象,通过回应技术针对系统特征进行制度设计。此举超越“用系统方式治理要素”的传统,确立“将系... 《生态环境法典(草案二次审议稿)》将“生态系统”确立为保护对象,其制度探索可概括为“识别-回应”框架:通过识别技术将系统确立为法律对象,通过回应技术针对系统特征进行制度设计。此举超越“用系统方式治理要素”的传统,确立“将系统本身作为保护对象”的新路径,在概念建构、对象确立与方法落地三个维度实现理论突破。然而,法典在概念贯通、层级定位、价值基础等方面仍有缺失,可通过将“生态系统”引入污染防治编、厘清系统与要素的层级关系、确立价值评价标准等路径予以完善。法典的尝试为法律应对复杂系统提供了方法论参照。 展开更多
关键词 复杂系统 生态系统 《生态环境法典》 法典编纂
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Efficient fast mode decision using mode complexity for multi-view video coding 认领 引用 被引量:2
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作者 王凤随 沈庆宏 都思丹 《Journal of Central South University》 SCIE EI CAS 2014年第11期4244-4253,共10页
The variable block-size motion estimation(ME) and disparity estimation(DE) are adopted in multi-view video coding(MVC) to achieve high coding efficiency. However, much higher computational complexity is also introduce... The variable block-size motion estimation(ME) and disparity estimation(DE) are adopted in multi-view video coding(MVC) to achieve high coding efficiency. However, much higher computational complexity is also introduced in coding system, which hinders practical application of MVC. An efficient fast mode decision method using mode complexity is proposed to reduce the computational complexity. In the proposed method, mode complexity is firstly computed by using the spatial, temporal and inter-view correlation between the current macroblock(MB) and its neighboring MBs. Based on the observation that direct mode is highly possible to be the optimal mode, mode complexity is always checked in advance whether it is below a predefined threshold for providing an efficient early termination opportunity. If this early termination condition is not met, three mode types for the MBs are classified according to the value of mode complexity, i.e., simple mode, medium mode and complex mode, to speed up the encoding process by reducing the number of the variable block modes required to be checked. Furthermore, for simple and medium mode region, the rate distortion(RD) cost of mode 16×16 in the temporal prediction direction is compared with that of the disparity prediction direction, to determine in advance whether the optimal prediction direction is in the temporal prediction direction or not, for skipping unnecessary disparity estimation. Experimental results show that the proposed method is able to significantly reduce the computational load by 78.79% and the total bit rate by 0.07% on average, while only incurring a negligible loss of PSNR(about 0.04 d B on average), compared with the full mode decision(FMD) in the reference software of MVC. 展开更多
关键词 multi-view video coding mode decision mode complexity computational complexity
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Furfural residues from straw become complex fertilizer by addition method 认领 引用 被引量:2
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作者 LIU Jun\gui,CHEN An\ 《Journal of Environmental Sciences》 SCIE EI CAS 2000年第2期74-77,共4页
The additives such as phosphoric acid, calcium phosphate, calcium super phosphate, calcium over super phosphate, calcium carbonate, sodium hydrosulphite, etc. were used to produce furfural from the straw by hydrolysis... The additives such as phosphoric acid, calcium phosphate, calcium super phosphate, calcium over super phosphate, calcium carbonate, sodium hydrosulphite, etc. were used to produce furfural from the straw by hydrolysis with sulfuric acid. The effect of amount of the additives, the content of the added substance and the conditions of distillation on the acidity of the residues were studied. The experiment results showed that the all residues became neutral complex fertilizer, and the productivity of furfural increases under the following conditions: sulfuric acid concentration is 20% (by weight), the ratio of liquid to solid is 3∶1—4∶1 (by weight), the ratio of the additives to straw is suitable. 展开更多
关键词 straw furfural residues complex fertilizer CLC number: X712 Document code: A
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复杂电磁环境下的图片传输机制优化研究 认领 引用
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作者 柯昌骏 张锦明 +1 位作者 曾诚 许道峰 《通信技术》 2026年第6期646-655,共10页
针对复杂电磁环境下无线信道弱连接、高丢包的传输特性,以及图片传输对数据完整性、高效性的需求矛盾,提出了一种基于喷泉码的改进型应用层传输机制,实现了复杂无线场景下图片传输的性能优化。通过设计传输协议和基于喷泉码的图片传输... 针对复杂电磁环境下无线信道弱连接、高丢包的传输特性,以及图片传输对数据完整性、高效性的需求矛盾,提出了一种基于喷泉码的改进型应用层传输机制,实现了复杂无线场景下图片传输的性能优化。通过设计传输协议和基于喷泉码的图片传输收发流程,完成原型软件的开发与实现,并结合广播、点对点可靠传输两类典型场景开展对比实验。实验结果表明,与传统多次冗余重发机制相比,基于喷泉码的图片传输方式在复杂电磁环境下能够保持接近100%的传输成功率,且显著降低时延增幅,对提升复杂电磁环境下的图片传输效率具有一定理论价值与工程意义。 展开更多
关键词 复杂电磁环境 喷泉码 传输协议优化 广播场景 点对点传输场景
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Frame complexity optimized selection for H.264/AVC video coding 认领 引用
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作者 Tian Ling Sun Yu +1 位作者 Zhou Yimin Sun Shixin 《High Technology Letters》 EI CAS 2011年第4期383-387,共5页
To improve the coding performance of H.264/AVC, this paper proposes a rate control scheme composed of a novel flame complexity optimized selection and a quantization parameter (QP) value computation approach. First,... To improve the coding performance of H.264/AVC, this paper proposes a rate control scheme composed of a novel flame complexity optimized selection and a quantization parameter (QP) value computation approach. First, it extracts the frame coding complexity from two rate distortion models, and then introduces five statistic modes to estimate the frame coding complexity. An optimal mode is selected according to the coding efficiency. Finally the paper presents a novel QP calculation method for the H.264/AVC rate control. Experimental results show that the proposed algorithra outperforms the algorithm integrated in the 3M model in obtaining precise frame coding complexity, achieving robust buffer control and improving coding quality. And the improving visual quality is high up to 0.90dB for CIF sequences. 展开更多
关键词 frame coding complexity rate control H.264/AVC RD model
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复杂环境下通信信号发射与接收优化技术研究 认领 引用
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作者 李冰清 李知阳 +2 位作者 张喜军 沈成治 徐艳伟 《音视频工程与应用》 2026年第4期53-55,共3页
在高密度城市与室内环境中,多径衰落、同频干扰与信道时变特性并存,严重影响通信信号的发射与接收质量。围绕抗干扰编码、自适应波束成形、闭环动态功率控制及信道均衡4项关键技术,依托软件定义无线电(Software Defined Radio,SDR)平台... 在高密度城市与室内环境中,多径衰落、同频干扰与信道时变特性并存,严重影响通信信号的发射与接收质量。围绕抗干扰编码、自适应波束成形、闭环动态功率控制及信道均衡4项关键技术,依托软件定义无线电(Software Defined Radio,SDR)平台,在街道峡谷、室内密集隔断及地下密闭空间3类场景下开展系统性实验验证。研究结果表明,优化方案在3类典型场景中均实现了显著的性能提升。 展开更多
关键词 复杂环境 通信信号 信道均衡 抗干扰编码
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贵阳某大型商业复杂结构设计 认领 引用
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作者 魏丰登 吴强 +1 位作者 贾丽娜 郑康 《建筑结构》 北大核心 2026年第4期107-113,共7页
贵阳某大型商业建筑为平面和竖向均不规则的复杂超限高层建筑,结构平面尺寸约为235m×159m,同时存在扭转不规则、楼板不连续、竖向构件不连续等超限项。结合项目特点介绍了结构基础选型;针对抗震不规则,从概念设计、计算分析、抗震... 贵阳某大型商业建筑为平面和竖向均不规则的复杂超限高层建筑,结构平面尺寸约为235m×159m,同时存在扭转不规则、楼板不连续、竖向构件不连续等超限项。结合项目特点介绍了结构基础选型;针对抗震不规则,从概念设计、计算分析、抗震构造等几个方面采取了优化结构布置、加强计算校核、提高抗震等级等措施,采用性能化设计以确保结构达到预定的抗震性能目标。对工程中重难点如结构超长、大跨人行连桥、室内110m长悬挂螺旋天梯、V形巨柱等进行了深入分析研究,提出了合理的解决方案,包括连桥设置调谐质量阻尼器有效改善舒适度、采用多道支撑结构保证螺旋天梯的整体稳定、通过防倒塌分析确保V形巨柱的结构安全等,并通过工程实践验证了设计的可行性和可靠性。 展开更多
关键词 复杂结构 超限高层建筑 超长结构 大跨结构 超长螺旋天梯 V形巨柱 调谐质量阻尼器 舒适度
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A man-made object detection algorithm based on contour complexity evaluation 认领 引用 被引量:4
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作者 Guili XU Zhengbing WANG +2 位作者 Yuehua CHENG Yupeng TIAN Chao ZHANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2017年第6期1931-1957,共27页
Man-made object detection is of great significance in both military and civil areas, such as search-and-rescue missions at sea, traffic signs recognition during visual navigation, and targets location in a military st... Man-made object detection is of great significance in both military and civil areas, such as search-and-rescue missions at sea, traffic signs recognition during visual navigation, and targets location in a military strike. Contours of man-made objects usually consist of straight lines, corner points, and simple curves. Motivated by this observation, a man-made object detection method is proposed based on complexity evaluation of object contours. After salient contours which keep the crucial information of objects are accurately extracted using an improved mean-shift clustering algorithm, a novel approach is presented to evaluate the complexity of contours. By comparing the entropy values of contours before/after sampling and linear interpolation, it is easy to distinguish between man-made objects and natural ones according to the complexity of their contours.Experimental results show that the presented method can effectively detect man-made objects when compared to the existing ones. 展开更多
关键词 Complexity evaluation Contour chain code Contour detection Man-made object detection Salient contour
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Newton‒Raphson算法的低复杂度编码辅助载波同步研究 认领 引用
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作者 王金杰 张少甫 +1 位作者 李婷婷 刘雨桐 《太赫兹科学与电子信息学报》 2026年第3期314-323,共10页
编码辅助载波同步可以充分利用译码过程的数据符号软值信息进行载波参数估计,在低信噪比条件下展现出优异性能。经典的编码辅助载波同步方法主要通过期望最大算法或其级数展开近似求解包含隐变量的非线性方程,但存在复杂度较高或估计精... 编码辅助载波同步可以充分利用译码过程的数据符号软值信息进行载波参数估计,在低信噪比条件下展现出优异性能。经典的编码辅助载波同步方法主要通过期望最大算法或其级数展开近似求解包含隐变量的非线性方程,但存在复杂度较高或估计精度有限的问题。本文利用极坐标形式下对数似然函数导数的雅可比矩阵易于推导的特点,使用Newton-Raphson迭代算法对非线性函数进行求解,在保持参数估计性能不降低的条件下,大幅降低了编码辅助载波同步参数估计的计算复杂度。计算机仿真表明,本文算法可在误码率性能与期望最大算法相当的情况下,大幅降低计算复杂度,接近级数展开近似算法,可适用于二进制相移键控(BPSK)、正交相移键控(QPSK)、正交振幅调制(QAM)等单载波线性调制系统。 展开更多
关键词 编码辅助载波同步 Newton-Raphson算法 低复杂度
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Optimal power allocation for complex field network coding scheme with the K-th best relay selection 认领 引用
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作者 Xi CAI Pingzhi FAN Qingchun CHEN 《Journal of Modern Transportation》 2012年第4期255-260,共6页
Wireless relay and network coding are two critical techniques to increase the reliability and throughput of wireless cooperative communication systems. In this paper, a complex field network coding (CFNC) scheme wit... Wireless relay and network coding are two critical techniques to increase the reliability and throughput of wireless cooperative communication systems. In this paper, a complex field network coding (CFNC) scheme with the K-th best relay selection (KBS) is proposed and investigated, wherein the K-th best relay is selected to forward the multiplexed signal to the destination. First, the upper bound of the symbol error probability (SEP), the diversity order, and the coding gain are derived for the CFNC scheme with KBS. Then, the coding gain is utilized as the optimized cri- terion to determine the optimal power allocation. It is validated through analysis and simulation that the CFNC scheme with KBS can achieve full diversity only when K=I, while the diversity order decreases with increasing parameter K, and the optimal power allocation can significantly improve the performance of the CFNC scheme with KBS. 展开更多
关键词 complex field network coding the K-th best relay selection power allocation
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代码自动生成工具Github Copilot生成代码质量的分析 认领 引用 被引量:8
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作者 王东煜 莫然 +1 位作者 詹文静 蒋颖婕 《计算机科学》 CSCD 北大核心 2025年第7期37-49,共13页
Github Copilot是Github和OpenAI推出的一款基于生成式AI的代码自动生成工具,它的核心功能之一,是根据自然语言的描述生成对应的实现代码。这一AI在编程领域的拓展,近年来引起了热议与重视。现阶段人们的关注点主要在AI编程与人类编程... Github Copilot是Github和OpenAI推出的一款基于生成式AI的代码自动生成工具,它的核心功能之一,是根据自然语言的描述生成对应的实现代码。这一AI在编程领域的拓展,近年来引起了热议与重视。现阶段人们的关注点主要在AI编程与人类编程的对比,比如AI程序员与人类程序员的编程效率对比,以及两者所编写的代码性能对比。然而,目前关于Copilot代码本身特征的研究较少,特别是代码质量问题,例如AI生成代码有哪些缺陷,这些缺陷是否会导致程序错误,以及代码是否易于理解等。代码质量对软件开发至关重要,分析AI生成代码的代码质量有助于更好地使用和改进此类代码生成工具。本文使用工具从LeetCode中提取所有的开源问题(共2033道)作为数据样本对Copilot进行测试,分别生成3种语言(Java,JavaScript,Python)的代码建议,提交并记录代码建议的执行结果。使用SonarQube静态分析这些代码建议文件,结合代码建议的执行结果,从可靠性、可维护性、复杂性3个维度分析Copilot的代码质量特征。结果发现:1)Copilot生成代码较为可靠,对于Java,JavaScript和Python 3种语言,分别收集了7,5,9种Bug类型,且3种语言涉及Bug的代码建议比例不超过3%,但涉及Bug的代码建议50%以上未通过测试;2)Copilot代码建议可维护性较差,对于Java,JavaScript和Python,分别收集了47,23,20种代码异味类类型,3种语言涉及代码建议的比例均超过40%,涉及代码异味的代码建议50%以上未通过测试用例;3)Copilot代码易于理解,多数代码建议的复杂度未超过阈值,且复杂度异常的代码建议比例不超过6%。最后,结合实验结果,提出了维护Copilot的可行建议,并探讨了此类工具未来可能的研究方向。 展开更多
关键词 自动代码生成 代码质量 代码可靠性 代码可维护性 代码复杂度
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A Note on Characteristic Generators of a Free Cyclic Code and Its Dual 认领 引用
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作者 YANG Qinqin QIN Zhongping 《Wuhan University Journal of Natural Sciences》 CAS 2009年第1期14-18,共5页
Let C be a free cyclic code over Zp^a and dim pC = k. In the paper, we prove that if the k characteristic generators of C are p-linearly independent then the corresponding nα- k characteristic generators of C^⊥ are ... Let C be a free cyclic code over Zp^a and dim pC = k. In the paper, we prove that if the k characteristic generators of C are p-linearly independent then the corresponding nα- k characteristic generators of C^⊥ are p-linearly independent. We then show that to any trellis that can be constructed from k p-linearly independent characteristic generators of C, there exists a trellis for C^⊥ with the same state-complexity profile, which generalizes the conjecture of Koetter and Vardy to a free cyclic code over Zpo. 展开更多
关键词 Hensel lift cyclic codes characteristic generators trellises state-complexity profile
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基于GNN的复杂电网薄弱节点辨识 认领 引用 被引量:1
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作者 李垚逸 吕飞鹏 +2 位作者 刘利文 魏韶韶 朱玉勇 《武汉大学学报(工学版)》 CAS CSCD 北大核心 2025年第3期407-415,共9页
为提高电网薄弱节点辨识模型的准确度,将节点特征与网络参数相结合,提出基于图神经网络(graph neural network,GNN)和复合节点特征的薄弱节点辨识方法。首先,分析电网结构,计算节点各项电气指标并将其作为染色体编码数据,以准确描述节... 为提高电网薄弱节点辨识模型的准确度,将节点特征与网络参数相结合,提出基于图神经网络(graph neural network,GNN)和复合节点特征的薄弱节点辨识方法。首先,分析电网结构,计算节点各项电气指标并将其作为染色体编码数据,以准确描述节点电气特征,同时增强节点间差异,提高辨识结果准确度和区分度;其次,利用GNN模型,建立节点间通过多条互异通路产生的关联关系,并对传统辨识方法中的节点间最短潮流路径理论进行优化,使得辨识模型更贴合电网实际,计算结果更加合理。算例分析表明,所述方法的辨识结果准确度高,且节点薄弱指标区分明显。 展开更多
关键词 图神经网络 复杂网络 薄弱指标 染色体编码 稳定性研究
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福州长乐国际机场交通中心复杂结构设计研究 认领 引用 被引量:1
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作者 耿伟 束伟农 +3 位作者 陈林 王翰墨 张歆宇 常虹 《建筑结构》 北大核心 2025年第19期1-7,共7页
福州长乐国际机场交通中心(GTC)是集轨道交通、商业、地空换乘于一体的复杂超限高层建筑,其结构设计面临抗震性能、超长混凝土裂缝控制及轨道交通共构等多项技术挑战。系统阐述了GTC的结构体系、抗震设计策略及创新技术应用。GTC结构采... 福州长乐国际机场交通中心(GTC)是集轨道交通、商业、地空换乘于一体的复杂超限高层建筑,其结构设计面临抗震性能、超长混凝土裂缝控制及轨道交通共构等多项技术挑战。系统阐述了GTC的结构体系、抗震设计策略及创新技术应用。GTC结构采用防屈曲约束支撑(BRB)+混凝土框架体系、弦支拱壳及桁架组合钢结构屋盖构成的混合结构体系,通过弹塑性时程分析、地空一体化沉降控制分析等精细化数值模拟,验证了罕遇地震作用下结构的安全性与经济性,以及上部结构对轨道工后沉降影响的可控性。研究结果表明:采用BRB显著提升了结构的耗能能力,支承屋盖的型钢混凝土柱在中震作用下保持弹性,大震损伤因子低于03。屋盖采用弦支拱壳结构,实现了建筑美学与结构受力性能的高度统一。超长混凝土结构通过设置加宽后浇带与补偿收缩技术等有效抑制了温度裂缝。 展开更多
关键词 福州长乐国际机场 复杂超限高层结构 防屈曲约束支撑 弦支拱壳结构 抗震性能 沉降控制
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