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基于层次分析法纯电动汽车综合性能评价

时代汽车 2024年第14期 117-119页

作者：解冰青明建平赖玉彬赣州职业技术学院江西赣州341000 江西环境工程职业学院江西赣州341000

纯电动汽车已经跻身现今人们用车选择的前列,它具有节能、经济、环保等优点。然而面对各式各样的纯电动汽车,使用者在了解各车性能差异后,应当使用何种科学有效的方法来挑选出一款最适应自身需求的纯电动汽车。为解决这一问题,文章运用... 详细信息

纯电动汽车已经跻身现今人们用车选择的前列,它具有节能、经济、环保等优点。然而面对各式各样的纯电动汽车,使用者在了解各车性能差异后,应当使用何种科学有效的方法来挑选出一款最适应自身需求的纯电动汽车。为解决这一问题,文章运用层次分析法建立综合评价模型,通过对用户较为关注的纯电动汽车经济性能、动力性能和安全性能进行评价,利用构建好的判断矩阵进行计算,再验证其结果,最终分析得到纯电动汽车的综合性能评价结果,可供用户参考。

关键词：纯电动汽车层次分析法判断矩阵综合性能评价

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不同术式治疗上颌骨囊肿的疗效评价

山东大学耳鼻喉眼学报 2024年第3期38卷 33-37页

作者：李红金王剑来育斌许敏薛涛陈福权查定军陈晓栋空军军医大学附属西京医院耳鼻咽喉头颈外科

目的探讨不同手术方式治疗上颌骨囊肿的优缺点，为临床实践提供理论依据。方法选择41例上颌骨囊肿患者为研究对象，其中17例患者采用传统唇龈入路行上颌骨囊肿切除术，24例患者采用经鼻内镜入路行上颌骨囊肿切除术。所有患者术后随访... 详细信息

目的探讨不同手术方式治疗上颌骨囊肿的优缺点，为临床实践提供理论依据。方法选择41例上颌骨囊肿患者为研究对象，其中17例患者采用传统唇龈入路行上颌骨囊肿切除术，24例患者采用经鼻内镜入路行上颌骨囊肿切除术。所有患者术后随访大于12个月，平均18个月，观察比较2组患者术后反应、视觉模拟疼痛评分、术后复发及术后肿胀麻木的发生情况。结果两种不同术式的合理选择，其术后反应、视觉模拟疼痛评分量表、术后复发及术后肿胀麻木的发生情况均未见明显差异。结论鼻内镜下开窗治疗上颌骨囊肿及唇龈入路治疗上颌骨囊肿均具有独特的优势，术前可依据影像学及鼻内镜检查，确定囊肿与上颌窦各壁的位置关系，从而选择更为合适的手术入路，使患者受益。

关键词：上颌骨囊肿唇龈入路鼻内镜泪前隐窝下鼻道

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中耳术后周围性面瘫8例临床特点及诊治分析

中华耳科学杂志 2024年第1期22卷 88-92页

作者：何星辰来育斌刘红生杨润琴李瑞杜苗苗查定军韩宇空军军医大学西京医院耳鼻咽喉头颈外科西安710032 国家耳鼻咽喉疾病临床医学研究中心陕西分中心西安交通大学附属西安市中心医院放射科延安大学医学院研究生院

目的分析和探讨中耳炎性疾病手术后发生周围性面瘫的病因、临床特点及诊治过程。方法回顾性分析2018年1月—2021年6月于空军军医大学西京医院耳鼻咽喉头颈外科收治的因中耳炎性病变手术且术后发生周围性面瘫的8例患者,分析其面瘫原因、... 详细信息

目的分析和探讨中耳炎性疾病手术后发生周围性面瘫的病因、临床特点及诊治过程。方法回顾性分析2018年1月—2021年6月于空军军医大学西京医院耳鼻咽喉头颈外科收治的因中耳炎性病变手术且术后发生周围性面瘫的8例患者,分析其面瘫原因、术中面神经情况及面瘫治疗效果。结果8例周围性面瘫患者中,迟发性面瘫6例、术腔感染致面瘫1例、抗中性粒细胞胞浆抗体相关性血管炎中耳炎1例;术中面神经骨管完整者4例、有面神经管骨质缺损者4例;给予保守治疗6例,保守治疗联合手术治疗1例,免疫治疗1例。面瘫持续时间,最短5 d、最长3年;随访至今,6例恢复至面神经功能HB I级,2例恢复至HBⅡ级。结论周围性面瘫为中耳术后少见并发症之一,以迟发性面瘫最为多见,保守治疗效果好;部分患者则为术后术腔感染、病变残留或复发导致面神经炎而出现面瘫;尚有少见免疫相关疾病。临床医师需仔细鉴别,避免误诊,并针对性提供治疗方案。

关键词：周围性面瘫中耳炎性疾病手术诊断治疗

基于提示嵌入的突发公共卫生事件微博文本情感分析

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数据分析与知识发现 2023年第11期7卷 46-55页

作者：赖宇斌陈燕胡小春黄欣广西大学计算机与电子信息学院南宁530004 广西财经学院大数据与人工智能学院南宁530007 广西农业职业技术大学信息工程学院南宁530007

【目的】为解决突发公共卫生事件初期微博数据量较少和口语化表达较多导致情感分析效果不佳的问题,提出一种基于提示嵌入和情感特征融合的微博情感分析模型。【方法】根据构建的情感词典提取微博文本情感信息;使用RoBERTa预训练模型提... 详细信息

【目的】为解决突发公共卫生事件初期微博数据量较少和口语化表达较多导致情感分析效果不佳的问题,提出一种基于提示嵌入和情感特征融合的微博情感分析模型。【方法】根据构建的情感词典提取微博文本情感信息;使用RoBERTa预训练模型提取语义向量和情感向量,将提示作为前缀嵌入语义向量,使用Transformer编码器和注意力机制分别提取语义特征与情感特征;然后使用焦点损失函数计算样本特征权重;最后,将语义特征与情感特征融合得到情感分析结果。【结果】以突发公共卫生事件中深圳新型冠状病毒感染疫情微博评论数据为例,所提情感分析模型的准确率和F1值分别达到93.46%和93.49%,较基准模型BERT分别提升6.78和6.97个百分点。【局限】微博数据存在大量图片和视频内容,未融合多个模态进行情感分析。【结论】所提模型基于提示嵌入与情感特征融合,可提升样本数据少时的情感分类效果,对其他同类情感分析研究具有借鉴意义。

关键词：提示嵌入特征融合少样本情感分析突发公共卫生事件

Power Flow Analytical Solutions and Multi-dimensional Voltage Stability Boundaries Based on Multivariate Quotient-difference Method

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1168-1178页

作者： Chengxi Liu Qiupin lai School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network Wuhan 430072China IEEE

This paper proposes a novel Multivariate Quotient-Difference(MQD)method to obtain the approximate analytical solution for AC power flow ***,in the online environment,the power flow solutions covering different operating conditions can be directly obtained by plugging values into multiple symbolic variables,such that the power injections and consumptions of selected buses or areas can be independently *** method first derives a power flow solution through a Multivariate Power Series(MPS).Next,the MQD method is applied to transform the obtained MPS to a Multivariate Pad´e Approximants(MPA)to expand the Radius of Convergence(ROC),so that the accuracy of the derived analytical solution can be significantly *** addition,the hypersurface of the voltage stability boundary can be identified by an analytical formula obtained from the coefficients of *** direct method for power flow solutions and voltage stability boundaries is fast for many online applications,since such analytical solutions can be derived offline and evaluated online by only plugging values into the symbolic variables according to the actual operating *** proposed method is validated in detail on New England 39-bus and IEEE 118-bus systems with independent load variations in multi-regions.

关键词： Analytical power flow solution multivariate power series multivariate Padéapproximants multivariate quotient-difference multi-dimensional voltage stability boundary

Preface to the Special Issue:Additive Manufacturing—Expanding Production Horizon

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 1-2页

作者： lai-Chang Zhang Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

Additive manufacturing(AM),commonly known as 3D printing,has become a transformative technology that has a profound impact on various industrial *** encompasses a set of techniques for building objects layer by layer from digital *** conventional subtractive manufacturing methods that involve removing material from large blocks,AM adds material incrementally,providing unprecedented design flexibility and efficiency.

关键词： removing printing Expanding

Remote sensing image encryption algorithm utilizing 2D Logistic memristive hyperchaotic map and SHA-512

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Science China(Technological Sciences) 2024年第5期67卷 1553-1566页

作者： lai Qiang LIU Yuan YANG Liang School of Electrical and Automation Engineering East China Jiaotong UniversityNanchang330013China

The two-dimensional Logistic memristive hyperchaotic map(2D-LMHM)and the secure hash SHA-512 are the foundations of the unique remote sensing image encryption algorithm(RS-IEA)suggested in this *** proposed map is formed from the improved Logistic map and the memristor,which has wide phase space and hyperchaotic range and is exceptionally excellent to be utilized in specific *** proposed image algorithm uses the permutation-assignment-diffusion *** generates two position matrices in a progressive manner to achieve an efficient random exchange of pixel positions,assignment is carried through on the image pixels of the permutated image to entirely remove the original image information,strengthening the relationship between permutation and diffusion,and loop diffusion in two different directions can use subtle changes of pixels to affect the whole *** random key and plain-image SHA-512 hash values are used to produce an additional key,which is then utilized to figure out the permutation parameters and the initial value of a chaotic *** experimental results with the average NPCR=99.6094%(NPCR:number of pixels change rate),average UACI=33.4638%(UACI:unified average changing intensity),100%pass rate of the targets in the test set,the average correlation coefficient is 0.00075,and the local information entropy is 7.9025,which shows that the algorithm is able to defend against a variety of illegal attacks and provide more trustworthy protection than some of the existing state-of-the-art algorithms.

关键词： chaos memristive hyperchaotic map remote sensing SHA-512 image encryption RS-IEA

First Digit Distributions of Gamma-Ray Bursts

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Research in Astronomy and Astrophysics 2024年第5期24卷 70-75页

作者： Hou-Yu lai Jun-Jie Wei Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China

The occurrence of the first significant digits from real world sources is usually not equally distributed,but is consistent with a logarithmic distribution instead,known as Benford’s *** this work,we perform a comprehensive investigation on the first digit distributions of the duration,fluence,and energy flux of gamma-ray bursts (GRBs) for the first *** a complete GRB sample detected by the Fermi satellite,we find that the first digits of the duration and fluence adhere to Benford’s ***,the energy flux shows a significant departure from this law,which may be due to the fact that a considerable part of the energy flux measurements is restricted by lack of spectral *** on the conventional duration classification scheme,we also check if the durations and fluences of long and short GRBs (with duration T_(90)>2 s and T_(90)≤2 s,respectively) obey Benford’s *** find that the fluences of both long and short GRBs still agree with the Benford distribution,but their durations do not follow Benford’s *** results hint that the long–short GRB classification scheme does not directly represent the intrinsic physical classification scheme.

关键词： (stars:)gamma-ray burst general-methods statistical-astronomical databases miscellaneous

Mechanical Performance of Bio-inspired Bidirectional Corrugated Sandwich Pressure Shell Under External Hydrostatic Pressure

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China Ocean Engineering 2024年第2期38卷 297-312页

作者： ZHANG Yi CHEN Yue YUN lai LIANG Xu Ocean College Zhejiang UniversityZhoushan 316000China Hainan Institute Zhejiang UniversitySanya 572000China

This paper aims to enhance the compression capacity of underwater cylindrical shells by adopting the corrugated sandwich structure of *** cuttlebone suffers uniaxial external compression,while underwater cylindrical shells are in a biaxial compressive stress *** suit the biaxial compressive stress state,a novel bidirectional corrugated sandwich structure is proposed to improve the bearing capacity of cylindrical *** static and buckling analysis for the sandwich shell and the unstiffened cylindrical shell with the same volume-weight ratio are studied by numerical *** is indicated that the proposed sandwich shell can effectively reduce the ratio between circumferential and axial stress from 2 to 1.25 and improve the critical buckling load by about 1.63 *** simulation shows that optimizing and adjusting the structural parameters could significantly improve the advantage of the sandwich ***,the hydrostatic pressure tests for shell models fabricated by 3D printing are carried *** to the experimental results,the overall failure position of the sandwich shell is at the center part of the sandwich *** has been found the average critical load of the proposed sandwich shell models exceeds two times that of the unstiffened shell ***,the proposed bio-inspired bidirectional corrugated sandwich structure can significantly enhance the pressure resistance capability of cylindrical shells.

关键词： bio-inspiration bidirectional corrugation sandwich shell external pressure buckling