In this paper,the global BMO estimates for the gradient of weak solutions to a class of elliptic equation obstacle problems is considered by using the Hardy-Littlewood maximal functions,the Jensen inequality for Young function,the perturbation method and other techniques.

为提高面向非计算机专业的程序设计通识类课程教学质量,提升学生实践应用能力,提出基于产出导向教育(OBE)理念的Python程序设计实践案例教学方法,从确定学习目的与成果、以产出为导向的教学案例内容体系构建、过程性考核方式的教学效果评价几方面进行阐述,介绍教学模式、实施过程及评价方法,通过教学效果评价结果说明该教学模式的有效性,旨在为通识教育下的Python程序设计课程建设提供参考.

针对实用拜占庭容错(PBFT)共识机制中存在的拜占庭节点和主节点选取简单的问题,提出了一种基于动态信任值的实用拜占庭容错算法的优化方案.首先根据节点历史行为,对节点进行信任值初始化;然后构建信任模型,并在信任模型中引入时间影响因子,根据时间远近,对节点进行信任值评价;最后引入分级机制,根据信任值结果,将节点分为共识组和拜占庭节点组,共识组节点参与下一轮共识;优化主节点选择方法,选择信任值最高的节点为主节点.通过实验对比表明,改进后的PBFT-TV算法较于PBFT算法在公平性、安全性、容错性、共识效率等方面有一定提升,并降低了通信复杂度.

The integration of cryptographic algorithms like Advanced Encryption Standard (AES) and Elliptic Curve Cryptography (ECC) is pivotal in bolstering the core attributes of blockchain technology, especially in achieving decentralization, tamper resistance, and anonymization within the realm of medical applications. Despite their widespread utilization, the conventional AES and ECC face significant hurdles in security and efficiency when dealing with expansive medical data, posing a challenge to the effective preservation of patient privacy. In light of these challenges, this study introduces HAE (hybrid AES and ECC), an innovative hybrid cryptographic algorithm that ingeniously amalgamates the robustness of AES with the agility of ECC. HAE is designed to symmetrically encrypt original data with AES while employing ECC for the asymmetric encryption of the initial AES key. This strategy not only alleviates the complexities associated with AES key management but also enhances the algorithm’s security without compromising its efficiency. We provide an in-depth exposition of HAE’s deployment within a framework tailored for medical scenarios, offering empirical insights into its enhanced performance metrics. Our experimental outcomes underscore HAE’s exemplary security, time efficiency, and optimized resource consumption, affirming its potential as a breakthrough advancement for augmenting blockchain applications in the medical sector, heralding a new era of enhanced data security and privacy within this critical domain.

非计算机专业的计算机通识教育课程是本科阶段培养学生计算思维与信息素养的基础课程.为了更好地将"双碳"理念融入教学,使教学内容、实践能力、情感培养三者有机融合.通过设计"双碳"专题教学内容,制定多元评价体系,形成基于 OBE理念的"项目引导+任务驱动"创新教学模式,为双碳背景下的通识课程教育教学改革提供借鉴与参考.

打破理工科和医科学科壁垒,实现医工交叉融合,以医学大数据分析课程为例,分析课程的教学目标和课程教学与人才培养目标的支撑关系,提出以"案例演示+实验练习+作业实训"为主导的"轻原理重应用的案例设计+三点一线的授课方法+创新应用为主体的考核机制"的教学模式,诠释课程教学设计和实践的具体过程,并给出以创新应用为教学成效的课程考核方法.

The synthesis of optimized thin film nanocomposite (TFN) membrane with no or few defects is an efficacious method which can improve nanofiltration performance. However, poor dispersion of fillers in the organic phase and wrong compatibility between fillers and polymerizate are still a serious problem. In this study, the particle size of metal organic framework (MOF), aluminum-based metal-organic frameworks (CAU-1) was modulated and for the first time, dodecyl aldehyde was used to modify the surface hydrophobicity of CAU-1, which improved the dispersibility and inhibited the aggregation in the trimesoyl chloride (TMC)/n-hexane solution; later CAU-1 and modified CAU-1 were incorporated into the polyamide (PA) selective layer to synthesize TFN membrane by interfacial polymerization (IP). The particle size modulation and modification of the CAU-1 were demonstrated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) characterization. The characterization showed that PA selective layer was synthesized on the top layer of polysulfone (PSF) substrate. The pure water flux of the TFN membrane was increased to 79.89 ± 1.24 L·m-2·h-1·bar-1 compared to the original thin film composite (TFC) membrane, which was due to the polymerization of 100 nm modified CAU-1 on the PA layer to form a new water molecular channel, thus increasing the water flux by about 70%.

"以本为本"的教学理念强调"学生最大受益",注重能力培养;"建构式"课堂注重自主学习、以学定教."利用学生社团、开展学生自主管理"的大学生程序设计大赛的自主辅导模式就基于此形式,其包含社团的招新组建和学生教练的选拔、梯队建设以及以训练OJ为学习平台的"建构式"辅导方式.这种管理模式不仅有利于培养学生自主学习、自我管理的素质,更锻炼了学生团队协作、实现目标的坚韧精神.而教师的作用体现在教学与大赛的融合,引导学生线上线下的延伸学习上.其再现了"先学后教,以学促教"的"构建性课堂"教学思想,为提高学生创新创业能力提供了一种教学模式的探索方向.

随着用户对推荐的准确性和实时性需求的不断提高,从海量用户历史数据中挖掘出用户需要的准确信息是一个极有价值的研究方向.基于模糊聚类的协同过滤算法首先要解决数据稀疏问题,对原始的用户评分数据进行预处理,采用SMOTE过采样技术填充数据有效解决了数据稀疏问题;然后利用模糊聚类实现评分数据的分类,结合艾宾浩斯遗忘曲线,将用户评价的时间戳作为因子对聚类后的数据进行评分预测,以此改善用户爱好随时间变化对推荐效果的影响,解决实时性问题.在M ovieLens-100k数据集上的实验结果表明,伴随时间的模糊协同过滤推荐可以明显提高推荐算法的准确性.

该文主要研究Orlicz空间中A-调和方程很弱解的梯度估计,其中算子A满足某些合适的条件,给定的向量函数满足适当的增长条件.

《关于进一步加强和改进大学生思想政治教育的意见》自中共中央、国务院发出,高校更加重视大学生的三观教育和综合素质教育.通过分析当前大学生特点和思想现状,阐述了当前思想政治教育工作者"一条腿走路"的弊端,提出专业教师与思想政治教育工作者协同育人的机制,并从具体实施策略上给予了系统论述,特别强调"渗透教育"和"隐式教育"的有效性,最后指出保证机制实施的政策支持.

A class of elliptic variational inequalities are considered in this paper. Local extremum principle for weak solutions is obtained using Moser iterative method.

分析地方高校大学计算机基础课程的现状,以培养学生的计算思维能力为目标,提出将虚拟实验体系融入实践教学环节,构建集虚拟实验平台、实践训练平台、网络作业平台和综合测试平台为一体的虚实融合的实验平台,为学生提供丰富的课内外实践训练,在培养学生计算思维的同时提高其应用技能和创新素质.

The higher integrability for very weak solutions ofA-harmonic form equationsd*A(x,u,du)=B(x,u,du)has been proved.

The Caccioppoli inequality of weakly A -harmonic tensors has been proved, which can be used to consider the weak reverse Hölder inequality, regularity property, and zeros of weakly A -harmonic tensors.

At present there is lack of a systematic, business-oriented monitor system that can meet the requirement of testing, monitoring and controlling. This paper proposed a new generation network monitoring system by employing new software. Based on the analyzing the new characters of new systems, and realizing the functions of the system, this paper explores concrete implementation steps of identifying feature automatic extraction, recognition methods and rules for automatic upgrade, correlative broadband, traffic sanitization, performance analysis of network and business-critical. Detailed analysis and results validate the effectiveness of the proposed system.

Wireless technologies bring great convenience, but they also introduce many new risks and vulnerabilities. Based on explaining the most famous Wireless LAN standard, the 802.11 network security threats and preventive measures are given.

The increasing popularity of wireless LANs brings a range of issues and challenges to network and information management. This book aims at designing a WLAN monitoring and management system. The system is designed to achieve real-time monitoring and intelligent management. This system can give Video Frame Capture for Mac, analyze the WLAN traffic characteristics, detect possible security vulnerabilities, and give the appropriate solution. At last source codes of the Graphical User Interface is shown.