基于JAVA建立树形结构的算法优化

树形结构在程序设计过程具有非常重要的作用,但树形结构的构建相对比较复杂。通过研究设计并实现一种从普通Java对象中建立树形结构的优化算法。     

基于曼哈顿距离构建非参数Q矩阵修正方法

将被试得分、理想反应距离和被试得分异常原理相结合,并加入属性计分下的被试得分特性,开发了用于多级评分情境下属性计分曼哈顿距离法(SA-MD),在不同条件下验证了SA-MD的稳定性和适宜性.通过模拟研究和实证研究表明:(i)从逻辑推导出SA-MD用于多级评分情境下Q矩阵修正更合理;(ii)在多种条件中,SA-MD 均有较优的修正效果,适用范围更广,稳定性更高;(iii)当小样本测验进行Q矩阵修正时,使用SA-MD方法可获得更优的效果.     

基于数据场联合PRI变换与聚类的雷达信号分选

基于脉冲描述字进行雷达信号分选时,传统聚类算法需要预先人工设定聚类中心和聚类数目。针对该问题,提出一种基于数据场理论联合脉冲重复间隔(pulse repetition interval,PRI)变换与聚类的雷达信号分选新方法。首先,依据数据场理论,基于势值大小实现干扰点剔除,而后利用PRI变换算法进行PRI估计,依据PRI估计值将归一化脉冲描述字数据预分类,进而以各类数据集中心间的欧氏距离小于辐射因子为准则进行类别合并,自动得到初始聚类中心和聚类数目,最后通过改进K-Means算法完成聚类分选。仿真实验表明:所提方法能够应对存在频率捷变,重频参差、抖动、参数交叠、局部脉冲丢失的复杂信号环境,分选正确率明显提升。     

A Method for Time-Series Location Data Publication Based on Differential Privacy

In the age of information sharing, logistics information sharing also faces the risk of privacy leakage. In regard to the privacy leakage of time-series location information in the field of logistics, this paper proposes a method based on differential privacy for time-series location data publication. Firstly, it constructs public region of interest(PROI) related to time by using clustering optimal algorithm. And it adopts the method of the centroid point to ensure the public interest point(PIP) representing the location of the public interest zone. Secondly, according to the PIP, we can construct location search tree(LST) that is a commonly used index structure of spatial data, in order to ensure the inherent relation among location data. Thirdly, we add Laplace noise to the node of LST, which means fewer times to add Laplace noise on the original data set and ensures the data availability. Finally, experiments show that this method not only ensures the security of sequential location data publishing, but also has better data availability than the general differential privacy method, which achieves a good balance between the security and availability of data.     

工程弹性系统与系统弹性理论研究综述

工程弹性系统(engineered resilient system,ERS)是美国国防部(department of defense,DOD)应对越来越不确定的任务和环境而提出的未来国防系统发展战略,对复杂系统的工程实践与系统弹性理论都带来新的挑战。首先,对ERS提出的背景和相关概念进行介绍,重点对美国国防领域对ERS的一些观点进行分析,包括ERS的关键属性、弹性工程与现役系统关系、ERS设计中考虑的因素和ERS与系统工程的关系等,并对美国DOD优先立项的ERS项目研究进展进行了的研究。其次,对弹性相关的学术研究进行了述评,包括不同领域中弹性的概念、系统弹性不同的评价方法以及系统弹性设计方法,以便于对ERS的发展有一个较为全面的了解和借鉴。最后,在ERS发展研究基础上,从理论和应用角度对ERS和系统弹性理论面临的挑战进行了讨论。     

刀柄砂光处理的六轴数控抛光系统的设计

针对人工抛光刀柄的质量不稳定等问题,设计了由HUST-CNC-H6C六轴控制器为核心的一套数控抛光系统,以解决整个刀柄的砂光处理.在软件设计部分,特别加入了通过手摇轮正反转来控制程序正反运行的功能,同时也为后期的调试工作带来了方便.实践表明:该控制系统在物理样机上可对刀柄焊缝进行一次性抛光处理.     

公司债券违约率的结构化模型研究

采用期权定价和违约率函数的结构化处理方法建立估计公司债券违约率的模型，应用美国国内公司的整体数据给出了将模型具体化的处理方法，得到一个带马尔可夫链的违约率函数。根据实证数据的初步检验，该函数的拟合效果比较理想，可用于估计一般性上市公司群体的债券违约率。文中的处理方法具有良好的可行性，只要拥有模型必需的股权价值、债务价值和违约率的数据，就能按照该方法将模型具体化，拟合出违约率函数，并由此来估计公司债券的违约率。     

作为方法论的思想考古学

福柯的人文科学考古学与库恩的科学哲学分别在不同的知识领域揭示了知识话语的冲突机制,因而可视为思想考古学的两个来源.他们的研究存在几个共同的前提性观点:非连续性历史观、非中心化的主体观、实践性的知识观、不确定性的语言观和微观性的权力观.这些前提性观点使思想考古学成为当代学者分析与解读社会现象的一种重要的方法论.     

对专科综合英语教学的探索与思考

综合英语教学是英语专业学习中的核心内容。文章就如何抓好专科综合英语教学中的语音基础及以学生为中心的教学模式展开探索与思考     

Science Letters： A synthetic Toll-like receptor 2 ligand decreases allergic immune responses in a mouse rhinitis model sensitized to mite allergen

It has been proposed that activation of Toll-like receptors （TLRs） plays crucial roles in the polarization of adaptive immune responses. A synthetic Toll-like receptor 2 （TLR2） ligand, Pam3CSK4, has been reported to modulate the balance of Th1/Th2 responses. We evaluated the modulation effect of Pam3CSK4 on allergic immune response in a mouse rhinitis model sensitized to house dust mite allergen （HDM）. Mice were sensitized and challenged with Dermatophagoidesfarinae allergen （Der f）, and then the allergic mice were treated by Pam3CSK4. Nasal allergic symptoms and eosinophils were scored. Der f-specific cytokine responses were examined in the splenocytes and bronchoalveolar lavage fluid （BALF）. Serum level of total IgE was also detected. After establishing a mouse allergic rhinitis model with HDM, we have showed that Pam3CSK4 treatment not only ameliorated the nasal allergic symptoms remarkably but also decreased the eosinophils and total inflammation cells in BALF significantly. Analysis of cytokine profile found that IFN-7 released from either BALF or stimulated splenocytes increased markedly in Pam3CSK4-treated mice, while IL-13 decreased significantly. Moreover, serum level of total IgE was significantly lower in Pam3CSK4-treated mice than in the untreated. Thus, in an allergic rhinitis mouse model developed with HDM, Pam3CSK4 was shown to exhibit an antiallergic effect, indicating its potential application in allergic diseases.