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CAC范式下健康信息过载对个体数字囤积行为的影响机理 认领 引用 被引量：3
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作者 张坤 谷晶晶 +1 位作者 李力 翟运开 《图书馆论坛》 CSSCI 北大核心 2026年第1期126-137,共12页
文章旨在揭示健康信息过载对个体数字囤积行为的影响,以完善数字囤积行为研究理论体系,为用户焦虑情绪纾解、数字囤积行为纠偏等提供理论与实践参考。文章以CAC理论为基本框架,构建健康信息过载对数字囤积行为的影响模型,并借助结构方... 文章旨在揭示健康信息过载对个体数字囤积行为的影响,以完善数字囤积行为研究理论体系,为用户焦虑情绪纾解、数字囤积行为纠偏等提供理论与实践参考。文章以CAC理论为基本框架,构建健康信息过载对数字囤积行为的影响模型,并借助结构方程模型和人工神经网络方法深入分析健康信息过载对个体数字囤积行为的影响机理。研究发现,数字囤积行为表现为个体对健康信息的过度获取和删除困难;健康信息过载情境下的焦虑情绪表现为错失焦虑、信息焦虑和健康焦虑,且健康信息过载对错失焦虑、信息焦虑和健康焦虑具有显著正向影响;情感维度下的错失焦虑对健康焦虑和过度获取、删除困难均有显著正向影响,信息焦虑显著正向影响错失焦虑和健康焦虑,而健康焦虑对过度获取、删除困难也均有显著正向影响。 展开更多
关键词 信息过载 数字囤积 数字行为 焦虑情绪 CAC理论
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硫化Fe/CAC催化剂在煤直接液化中的催化性能研究 认领 引用
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作者 李健 徐飞 +4 位作者 蔡亚迪 姚喃喃 艾沙·努拉洪 阿布力克木·阿布力孜 任铁真 《分子催化（中英文）》 CAS CSCD 北大核心 2026年第3期331-343,I0003,I0004,共13页
煤直接液化(direct coal liquefaction,DCL)技术是将煤在氢气、溶剂和催化剂作用下,通过加氢裂解直接转化为液体燃料和化学品的工艺,是实现煤炭清洁高效利用的有效途径,开发高效催化剂可有效降低反应条件限制与提升经济效益.采用一步原... 煤直接液化(direct coal liquefaction,DCL)技术是将煤在氢气、溶剂和催化剂作用下,通过加氢裂解直接转化为液体燃料和化学品的工艺,是实现煤炭清洁高效利用的有效途径,开发高效催化剂可有效降低反应条件限制与提升经济效益.采用一步原位负载焙烧还原工艺,以新疆俄霍布拉克煤田次烟煤(EK)为碳载体,以Fe(NO3)3为Fe源,单质硫为硫化剂,制备了硫化Fe/CAC(煤基活性炭)催化剂,研究其在准东-西沟煤(XG)直接加氢液化过程中的催化性能.直接加氢液化实验结果表明:未硫化的Fe/CAC催化剂体系可使XG的转化率达到88.29%,油收率为73.02%;将Fe/CAC催化剂在250℃、1 MPa条件下进行硫化处理后,XG的转化率和油收率分别提升至96.8%和81.1%.与未硫化Fe/CAC催化剂相比,硫化处理显著提高了煤直接液化反应的转化率和油收率,催化性能得到明显优化.此外,在制备硫化Fe/CAC催化剂的过程中,随着硫化压力的升高,或添加氢供体溶剂(四氢萘),XG煤的转化率和油收率均呈现不同程度的下降趋势. 展开更多
关键词 煤直接液化 Fe/CAC催化剂 加氢液化 硫化
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基于CAC范式的突发公共卫生事件个体保护行为影响因素研究 认领 引用
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作者 王晓 林中惠 +2 位作者 王玉阳 陈思菁 段尧清 《信息资源管理学报》 CSSCI 2026年第1期89-100,共12页
基于“认知-情感-意动(CAC)”范式构建突发公共卫生事件个体保护行为影响因素模型,通过网络调查收集379份问卷,采用偏最小二乘结构方程模型(PLS-SEM)进行实证分析,探究突发公共卫生事件风险感知、负面情感、信息搜寻行为与个体保护行为... 基于“认知-情感-意动(CAC)”范式构建突发公共卫生事件个体保护行为影响因素模型,通过网络调查收集379份问卷,采用偏最小二乘结构方程模型(PLS-SEM)进行实证分析,探究突发公共卫生事件风险感知、负面情感、信息搜寻行为与个体保护行为之间的影响作用机制。研究结果显示,风险感知的严重性和不可控性对恐惧、焦虑均具有显著的正向影响,焦虑对个体保护行为具有显著的正向影响,同时风险感知的严重性和不可控性通过焦虑间接影响个体保护行为,且信息搜寻行为对上述中介作用具有显著的调节作用。本研究从认知、情感、行为意动的关联路径视角为突发公共卫生事件个体保护行为研究建立了分析框架,有利于优化突发事件风险沟通机制、增强风险治理举措实施效能。 展开更多
关键词 CAC范式 突发公共卫生事件 个体保护行为 风险感知 负面情感 信息搜寻行为
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Study on the aided PC-ASCL decoding algorithm based on optimized parity check codes 认领 引用
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作者 Jianguo YUAN Deyi YANG +1 位作者 Ziliang ZHU Jinneng XIANG 《Optoelectronics Letters》 EI 2026年第2期87-91,共5页
Aiming at the poor performance of the parity check(PC) aided adaptive successive cancellation list(PC-ASCL) decoding algorithm because the PC code in the polar code can only verify odd errors, an optimized parity chec... Aiming at the poor performance of the parity check(PC) aided adaptive successive cancellation list(PC-ASCL) decoding algorithm because the PC code in the polar code can only verify odd errors, an optimized parity check(OPC) code which can verify all odd errors as well as the half even errors is proposed. The OPC code is used to improve the PC-ASCL decoding algorithm, thus an OPC aided ASCL(OPC-ASCL) decoding algorithm is proposed. In the coding stage, the algorithm divides the information sequence into multiple segments, and places an OPC code at the end of each segment to verify the current information sequence, and places a cyclic redundancy check code at the end of the entire information sequence to verify the entire information sequence. In the decoding stage, the algorithm uses the OPC-ASCL decoder to decode. Simulation results show that compared to the PC-ASCL decoding algorithm, the OPC-ASCL decoding algorithm can reduce the complexity and obtain the certain performance gain. 展开更多
关键词 pc ascl decoding pc code adaptive successive cancellation list pc ascl divides information sequence multip parity check polar code optimized parity check coding stage
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Partial-measurement-enhanced high-dimensional superdense coding in amplitude damping channel with memory 认领 引用
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作者 Xing Xiao Zhipeng Yang +2 位作者 Yan-Ling Li Fangqing Tang Tian-Xiang Lu 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第4期109-120,共12页
We study the performance of high-dimensional superdense coding(HD-SDC)over an amplitude damping(AD)channel with memory and propose a protocol that leverages partial measurement and its reversal to enhance the channel ... We study the performance of high-dimensional superdense coding(HD-SDC)over an amplitude damping(AD)channel with memory and propose a protocol that leverages partial measurement and its reversal to enhance the channel capacity.By considering a two-qutrit system,we model the memory AD noise using a convex mixture of memoryless and perfectly memory AD channels.We demonstrate that the memory effect alone can mitigate the decay of the SDC capacity under noise.More significantly,we show that the application of partial measurement before the channel and its reversal after the channel can not only recover the capacity degraded by noise but,for certain non-maximally entangled initial states,even amplify it beyond the initial capacity.This amplification effect is governed by three key factors:the ground-state probability in the initial entangled state,the memory strength,and the partial measurement strength.Our results provide a practical strategy for enhancing quantum communication protocols in realistic noisy environments and highlight the synergistic benefits of memory noise and measurement-based control. 展开更多
关键词 high-dimensional systems superdense coding memory noise partial measurement
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Quantum toric code decoding method based on syndrome-preliminary error fusion module and ResNet architecture 认领 引用
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作者 Nai-Hua Ji Ping-Li Song +2 位作者 Wei Wang Hui-Qian Sun Hong-Yang Ma 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第6期649-659,共11页
Quantum error correction technology is based on the principle of redundant encoding,encoding logical quantum information into multiple physical qubits to provide important support for the stable operation of quantum c... Quantum error correction technology is based on the principle of redundant encoding,encoding logical quantum information into multiple physical qubits to provide important support for the stable operation of quantum computers.To address the issues of low decoding accuracy and limited feature extraction in quantum error correction,this paper proposes a toric code decoder based on a syndrome-preliminary error fusion module(SPEFM)and a ResNet architecture.This decoder takes full advantage of the correlations between X and Z errors.In the SPEFM,the syndrome and preliminary error predictions are deeply fused,while a unidirectional Swin transformer architecture is incorporated to extract global error features from the syndrome data,signiffiificantly improving both decoding accuracy and computational efffiificiency.In addition,this paper further extracts local error features from the fused features using the deep residual structure of ResNet,enhancing the decoder's ability to capture quantum error patterns.Experimental results show that the decoder is applicable to different code distances(d=4,6,8,10)under the depolarizing noise model.Its bit error rate is lower than that of the minimum weight perfect matching(MWPM)algorithm,and its logical error rate is lower than both the MWPM algorithm and the ResNet18 decoder.Furthermore,the decoding threshold is increased to 0.163,representing a 3.82%improvement over the MWPM algorithm threshold of 0.157. 展开更多
关键词 quantum error correction toric code ResNet Swin transformer
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The gap between principle and practice of lossy image coding 认领 引用
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作者 Haotian Zhang Dong Liu 《Journal of University of Science and Technology of China》 CAS CSCD 北大核心 2026年第1期1-12,I0001,共12页
Lossy image coding is the art of computing that is principally bounded by the image’s rate-distortion function.This bound,though never accurately characterized,has been approached practically via deep learning techno... Lossy image coding is the art of computing that is principally bounded by the image’s rate-distortion function.This bound,though never accurately characterized,has been approached practically via deep learning technologies in recent years.Indeed,learned image coding schemes allow direct optimization of the joint rate-distortion cost,thereby outperforming the handcrafted image coding schemes by a large margin.Still,it is observed that there is room for further improvement in the rate-distortion performance of learned image coding.In this article,we identify the gap between the ideal rate-distortion function forecasted by Shannon’s information theory and the empirical rate-distortion function achieved by the state-of-the-art learned image coding schemes,revealing that the gap is incurred by five different effects:modeling effect,approximation effect,amortization effect,digitization effect,and asymptotic effect.We design simulations and experiments to quantitatively evaluate the last three effects,which demonstrates the high potential of future lossy image coding technologies. 展开更多
关键词 information theory learned image coding lossy image coding rate-distortion function
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基于Vibe Coding的计算机程序设计课程改革 认领 引用
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作者 许玉龙 朱红磊 宋婷 《数字通信世界》 2026年第5期241-243,共3页
人工智能融入软件开发,传统计算机程序设计课程难以适配新时代人才培养需求。Vibe Coding以氛围、心流体验为基础,强调人机协同、思维与实践融合。本文阐释其内涵价值,提出改革策略与保障措施,以提升学生多种能力,培育适配时代的应用型... 人工智能融入软件开发,传统计算机程序设计课程难以适配新时代人才培养需求。Vibe Coding以氛围、心流体验为基础,强调人机协同、思维与实践融合。本文阐释其内涵价值,提出改革策略与保障措施,以提升学生多种能力,培育适配时代的应用型人才。 展开更多
关键词 Vibe Coding 心流开发 计算机程序设计 课程改革 计算思维
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Vibe Coding背景下高职程序设计课程价值重审与教学重构 认领 引用
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作者 周邵锦 《安徽电子信息职业技术学院学报》 2026年第1期80-86,共7页
生成式人工智能催生的“Vibe Coding”范式正深刻改变软件开发流程,对高职程序设计课程带来严峻的挑战。本研究以Python课程为例,提出程序设计课程须秉持守正与创新的辩证教育观:在编程门槛降低的表象下,坚守计算思维、算法素养与工匠... 生成式人工智能催生的“Vibe Coding”范式正深刻改变软件开发流程,对高职程序设计课程带来严峻的挑战。本研究以Python课程为例,提出程序设计课程须秉持守正与创新的辩证教育观:在编程门槛降低的表象下,坚守计算思维、算法素养与工匠精神这一育人内核,同时主动适应人机协同教学新生态,构建“基础层、模块层、应用层”三层内容体系,重塑“场景导入—意图解构—协同生成—理解优化—迁移应用”教学流程。实践表明,该教学重构有效降低了学生的认知负荷,显著提升了学生的代码鉴伪与系统构建能力,为智能时代高素质技术技能人才的培养提供了可操作的实践路径。 展开更多
关键词 Vibe Coding 意图驱动编程 高职程序设计 人机协同 教学重构 高阶全栈素养
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Integration of Large Language Models(LLMs)and Static Analysis for Improving the Efficacy of Security Vulnerability Detection in Source Code 认领 引用 被引量：1
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作者 José Armando Santas Ciavatta Juan Ramón Bermejo Higuera +3 位作者 Javier Bermejo Higuera Juan Antonio Sicilia Montalvo Tomás Sureda Riera Jesús Pérez Melero 《Computers, Materials & Continua》 SCIE EI 2026年第3期351-390,共40页
As artificial Intelligence(AI)continues to expand exponentially,particularly with the emergence of generative pre-trained transformers(GPT)based on a transformer’s architecture,which has revolutionized data processin... As artificial Intelligence(AI)continues to expand exponentially,particularly with the emergence of generative pre-trained transformers(GPT)based on a transformer’s architecture,which has revolutionized data processing and enabled significant improvements in various applications.This document seeks to investigate the security vulnerabilities detection in the source code using a range of large language models(LLM).Our primary objective is to evaluate the effectiveness of Static Application Security Testing(SAST)by applying various techniques such as prompt persona,structure outputs and zero-shot.To the selection of the LLMs(CodeLlama 7B,DeepSeek coder 7B,Gemini 1.5 Flash,Gemini 2.0 Flash,Mistral 7b Instruct,Phi 38b Mini 128K instruct,Qwen 2.5 coder,StartCoder 27B)with comparison and combination with Find Security Bugs.The evaluation method will involve using a selected dataset containing vulnerabilities,and the results to provide insights for different scenarios according to the software criticality(Business critical,non-critical,minimum effort,best effort)In detail,the main objectives of this study are to investigate if large language models outperform or exceed the capabilities of traditional static analysis tools,if the combining LLMs with Static Application Security Testing(SAST)tools lead to an improvement and the possibility that local machine learning models on a normal computer produce reliable results.Summarizing the most important conclusions of the research,it can be said that while it is true that the results have improved depending on the size of the LLM for business-critical software,the best results have been obtained by SAST analysis.This differs in“NonCritical,”“Best Effort,”and“Minimum Effort”scenarios,where the combination of LLM(Gemini)+SAST has obtained better results. 展开更多
关键词 AI+SAST secure code LLM benchmarking LLM vulnerability detection
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国内国际双循环 CAC构筑全球农化新生态 认领 引用
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作者 徐晓磊 王晓宇 《中国农资》 2026年第7期14-14,共1页
3月17日,第二十六届中国国际农用化学品及植保展览会(CAC2026)在国家会展中心(上海)盛大启幕。本届展会不仅再次展现了其作为全球农化行业顶尖盛会的规模与影响力,更在一个关键数据背景下开幕:2020—2025年,全球农药供应极度依赖中国,... 3月17日,第二十六届中国国际农用化学品及植保展览会(CAC2026)在国家会展中心(上海)盛大启幕。本届展会不仅再次展现了其作为全球农化行业顶尖盛会的规模与影响力,更在一个关键数据背景下开幕:2020—2025年,全球农药供应极度依赖中国,中国出口趋势直接映射全球库存周期。这清晰地表明,在全球农药产业的“新常态”下,中国依然是世界农药供需产业链不可或缺的核心支柱。CAC展会,正成为中国农资市场与全球市场联结、互动、协同发展的关键枢纽。 展开更多
关键词 CAC 中国国际农用化学品及植保展览会
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基于CAC模型的护理教育短视频持续使用意愿影响因素研究 认领 引用
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作者 张立羽 罗玉梅 许必芳 《科技资讯》 2026年第10期248-251,共4页
目的以认知—情感—意动(Cognition-Affect-Conation,CAC)模型为基础,探讨护理学生短视频课程持续使用的关键影响因素。方法以本校2023级护理大专学生为对象,收集了有效问卷422份。本研究采用偏最小二乘结构方程模型(Partial Least Squa... 目的以认知—情感—意动(Cognition-Affect-Conation,CAC)模型为基础,探讨护理学生短视频课程持续使用的关键影响因素。方法以本校2023级护理大专学生为对象,收集了有效问卷422份。本研究采用偏最小二乘结构方程模型(Partial Least Squares Structural Equation Modeling,PLS-SEM)对相关变量进行分析。结果课程质量和教学方法显著提升课程效果,但课程效果对满意度影响有限。绩效期望是满意度的重要来源,满意度能够增强信任。信任的作用最为突出,是持续使用意愿的最强预测因子。结论护理学生在短视频学习中更关注长期价值,绩效期望通过满意度和信任影响其持续使用意愿,为课程设计与优化提供参考。 展开更多
关键词 护理教育 短视频 CAC模型 持续使用意愿
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Two Bit-Serial Architectures for Check Node Update in Min-Sum Decoding of LDPC Codes 认领 引用
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作者 Hu Qing He Xuan +2 位作者 Luo Lisha Cai Kui Tang Xiaohu 《China Communications》 SCIE EI CSCD 2026年第3期142-150,共9页
Implementing check node(CN)update based on the minimum value(MV)and second MV of incoming message magnitudes is crucial for Min-Sum Algorithms(MSAs).In the category of bit-serial implementations,existing schemes suffe... Implementing check node(CN)update based on the minimum value(MV)and second MV of incoming message magnitudes is crucial for Min-Sum Algorithms(MSAs).In the category of bit-serial implementations,existing schemes suffer from decoding performance degradation,large hardware areas,and/or long latency.In this paper,we propose two efficient CN update functions based on the MV and an approximate second MV,and design bit-serial architectures to implement them.Simulation results show that our functions exhibit the minimum decoding performance degradation compared to the existing functions using approximate second MVs.Moreover,the applicationspecific integrated circuits(ASIC)implementation results demonstrate the advantages of our architectures in terms of area,latency,etc. 展开更多
关键词 bit-serial check node update hardware implementation LDPC code min-sum algorithm
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Coding-based distributed filtering for cyber–physical systems under denial of service attacks 认领 引用
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作者 Shuang Feng Damián Marelli +2 位作者 Chen Wang Minyue Fu Tianju Sui 《Journal of Automation and Intelligence》 EI CSCD 2026年第1期13-23,共11页
This article investigates the distributed recursive filtering problem for discrete-time stochastic cyber–physical systems.A particular feature of our work is that we consider systems in which the state is constrained... This article investigates the distributed recursive filtering problem for discrete-time stochastic cyber–physical systems.A particular feature of our work is that we consider systems in which the state is constrained by saturation.Measurements are transmitted to nodes of a sensor network over unreliable wireless channels.We propose a linear coding mechanism,together with a distributed method for obtaining a state estimate at each node.These designs aim to minimize the state estimation error covariance.In addition,we derive a bound on this covariance,and accommodate the design parameters to minimize this bound.The resulting design depends on the packet loss probabilities of the wireless channels.This permits applying the proposed scheme to systems in which communications suffer from denial-of-service attacks,as such attacks typically affect those probabilities.Finally,we present a numerical example illustrating this application. 展开更多
关键词 Cyber–physical system Sensor network Denial-of-service attack Linear coding State saturation
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Multi-Attempt List Decoding of Polar Codes 认领 引用
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作者 Yuan Peihong Chen Zhe +1 位作者 Wu Yongpeng Gao Yue 《China Communications》 SCIE EI CSCD 2026年第4期27-36,共10页
In this work,we propose a multi-attempt successive cancellation list(MA-SCL)decoder for polar codes that achieves identical error-correction performance to standard SCL decoding while reducing average complexity.Unlik... In this work,we propose a multi-attempt successive cancellation list(MA-SCL)decoder for polar codes that achieves identical error-correction performance to standard SCL decoding while reducing average complexity.Unlike CRC-aided SCL,the proposed MA-SCL progressively restarts decoding with increasing list sizes and reuses information from previous attempts.This design eliminates the need for outer CRC codes.The decoder features dynamic searchspace pruning and an early stopping criterion based on path metrics.Simulations show MA-SCL matches SCL performance with lower average complexity,particularly for short polar-like codes with reed-muller(RM)rate profiles and dynamic frozen constraints.Compared to existing adaptive decoders,MA-SCL offers implementation advantages by eliminating the need for stack-/heap management while providing relatively stable latency bounds(1×to|Λ|×SCL latency). 展开更多
关键词 complexity-adaptive decoding list decoding polar coding
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走向Vibe Coding:QuickForm的本地部署和功能升级 认领 引用
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作者 陈恩慈 谢作如 《中国信息技术教育》 2026年第9期89-91,共3页
在数字化教育快速发展的今天,教师如何安全、便捷地掌控教学数据工具并实现人工智能赋能,已成为推动精准教学的关键。本文以QuickForm数据收集平台为例,探讨其本地部署的创新优势与功能升级路径。QuickForm教师版通过内置Python环境与... 在数字化教育快速发展的今天,教师如何安全、便捷地掌控教学数据工具并实现人工智能赋能,已成为推动精准教学的关键。本文以QuickForm数据收集平台为例,探讨其本地部署的创新优势与功能升级路径。QuickForm教师版通过内置Python环境与可视化启动界面,实现了“一键启动、免安装”的极简体验,显著降低了技术门槛。同时,本文结合Vibe Coding理念,阐述了教师如何从单纯的技术使用者转变为技术驾驭者,以期为人工智能赋能教学提供一条切实可行的实践路径。 展开更多
关键词 AI赋能教学 QuickForm Vibe Coding
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Design of a compact wide-field-of-view infrared imager based on wavefront coding 认领 引用
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作者 Chonghui Zhu Jiaqian Yu Jingang Cui 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第2期383-388,共6页
Compact size,high brightness,and wide field of view(FOV)are key requirements for long-wave infrared imagers used in military surveillance or night navigation.However,to meet the imaging requirements of high resolution... Compact size,high brightness,and wide field of view(FOV)are key requirements for long-wave infrared imagers used in military surveillance or night navigation.However,to meet the imaging requirements of high resolution and wide FOV,infrared optical systems often adopt complex optical lens groups,which will increase the size and weight of the optical system.In this paper,a strategy based on wavefront coding(WFC)is proposed to design a compact wide-FOV infrared imager.A cubic phase mask is inserted into the pupil plane of the infrared imager to correct the aberration.The simulated results show that,the WFC infrared imager has good imaging quality in a wide FOV of±16°.In addition,the WFC infrared imager achieves compactness with its 40 mm×40 mm×40 mm size.A fast focal ratio of 1 combined with an entrance pupil diameter of 25 mm ensures brightness.This work is of significance for designing a compact wide-FOV infrared imager. 展开更多
关键词 optical design infrared imager wavefront coding
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On Distortion of Fading Channels without and with Channel Coding in Real-Time Wireless Systems 认领 引用
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作者 He Meilin Lei Yanchao +1 位作者 Wang Haiquan Pan Peng 《China Communications》 SCIE EI CSCD 2026年第6期103-117,共15页
With the rise of the internet of things demanding low latency,the significance of real-time transmission communications is being increasingly emphasized.In real-time transmission systems,there are two ways to do the t... With the rise of the internet of things demanding low latency,the significance of real-time transmission communications is being increasingly emphasized.In real-time transmission systems,there are two ways to do the transmission:without and with channel coding,and therefore,it is worth comparing the performance of these ways.In this paper,the distortions of these two systems are derived.Specifically,a general formula for calculating distortion in wireless communication systems is first provided.Next,variations of the formula are developed for three standard wireless communication systems:single-input,single-output(SISO);multiple-input,multiple-output(MIMO)with a Gaussian channel;and mmWave MIMO.Theoretical derivations,supported by simulation results,demonstrate that systems without channel coding exhibit less distortion than those with channel coding on average. 展开更多
关键词 average distortion channel coding realtime transmission
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Adaptive Coding and Modulation Using Enhanced Turbo Codes for Meteor Burst Communication 认领 引用
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作者 Ding Mengchuan Li Zhiyong +1 位作者 Wang Wei Li Xuekun 《China Communications》 SCIE EI CSCD 2026年第5期1-14,共14页
Meteor burst channels(MBC)exhibit significant randomness and non-stationarity,limiting the effectiveness of traditional fixed-rate transmission strategies.This paper proposes an adaptive coding and modulation(ACM)sche... Meteor burst channels(MBC)exhibit significant randomness and non-stationarity,limiting the effectiveness of traditional fixed-rate transmission strategies.This paper proposes an adaptive coding and modulation(ACM)scheme based on real-time channel state perception using enhanced Turbo codes.By leveraging the interleaving structure of Turbo codes to mitigate channel fading and incorporating multi-rate adaptation,the scheme dynamically adjusts symbol rate,modulation,and coding methods to improve spectral efficiency.Meanwhile,a joint evaluation mechanism integrating physical-layer signal to noise ratio(SNR)estimation and media access control(MAC)-layer frame error rate(FER)statistics is introduced to achieve dynamic optimization of switching thresholds in multipath channels.Simulation and experimental results demonstrate that the proposed scheme significantly enhances system adaptability to MBC,and increases data transmission success rates,offering a more efficient and reliable solution for MBC systems. 展开更多
关键词 ACM enhanced turbo codes MAC-layer meteor burst channels
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术前NLR、D-D及CACS构建PCI术后CIN预测模型 认领 引用
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作者 高旭升 魏向东 李少华 《中南医学科学杂志》 CAS 2026年第3期476-479,共4页
目的分析术前中性粒细胞与淋巴细胞比值(NLR)、D-二聚体(D-D)及冠状动脉钙化积分(CACS)对经皮冠脉介入术(PCI)术后对比剂肾病(CIN)的预测价值,并构建术后CIN预测模型。方法选择接受PCI的冠心病患者426例,按7∶3分为训练集(n=298)和验证... 目的分析术前中性粒细胞与淋巴细胞比值(NLR)、D-二聚体(D-D)及冠状动脉钙化积分(CACS)对经皮冠脉介入术(PCI)术后对比剂肾病(CIN)的预测价值,并构建术后CIN预测模型。方法选择接受PCI的冠心病患者426例,按7∶3分为训练集(n=298)和验证集(n=128)。根据术后是否发生CIN,将训练集病例分为CIN组(n=57)和非CIN组(n=241)。比较各组临床资料。采用Logistic多因素回归分析CIN的影响因素并构建预测模型,通过ROC曲线及校准曲线评估模型的预测效能与分层价值。结果CIN组与非CIN组年龄、糖尿病占比、左室射血分数、术前肌酐、估算的肾小球滤过率、对比剂用量、利尿剂使用占比、白细胞计数、中性粒细胞计数、淋巴细胞计数、NLR、D-D、空腹血糖和CACS比较,差异有显著性(P<0.05)。NLR、D-D和CACS是术后CIN的影响因素(P<0.001)。成功构建PCI术后CIN预测模型,该模型的AUC值高于单一指标预测效能值(P<0.001)。结论成功构建并验证了基于术前NLR、D-D及CACS的PCI术后CIN预测模型。该模型预测效能优异,分层能力明确,可为临床早期识别高危患者并实施针对性干预提供有力依据。 展开更多
关键词 NLR D-D 冠状动脉钙化积分 经皮冠脉介入术 对比剂肾病
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