基于变换光学的旋转黑洞模拟

在变换光学和天文学的学科交叉中,黑洞模拟一直是一个重要的课题.随着黑洞照片的公布,相关研究已成为热点.在此之前,科研工作者们模拟的史瓦西黑洞并不像真实黑洞那样,光线在进入黑洞时的状态并不是旋转的.为了更好地模拟真实黑洞的特性,将保角变换得到的折射率分布结合已有的旋转器件合成一个新型的旋转器件,即旋转黑洞,并在其中内置一个吸收体来模拟旋转黑洞附近的光学行为.通过高斯光波的传输以及光线追踪仿真,从波动光学和几何光学两个角度验证了光线旋转进入模拟器件后将被吸收而无法逃逸的特性.国家自然科学基金（11874311

基于替换概率的闪存数据库缓冲区替换算法

闪存具有和传统磁盘不同的特性，包括写前擦除、异地更新、读写延迟非对称等.传统的面向磁盘的缓冲区替换算法无法在闪存数据库系统中获得较好的性能.文中提出了一种新的面向闪存数据库的缓冲区替换算法——APB-LRU，其特点：(1)该算法将缓冲区分为冷区和热区，用来捕获数据访问频度，前者用于存放只访问过一次的数据页，后者用于存放至少访问过两次的数据页；(2)采用了其它研究所没有的概率替换机制，即以较大的概率替换冷区中的干净页，以较小的概率替换冷区中的脏页，从而避免了冷脏页长期驻留缓冲区的情况，提高了命中率，获得了较好的整体性能；(3)设计了冷、热区比例动态变化机制，可以根据工作负载的变化动态调整冷、热区所占缓冲区的比例，从而使得替换算法在不同的负载模式下都可以取得较好的性能.基于不同测试数据集的大量实验结果表明，APB-LRU算法具有比其它已有的算法更好的性能.厦门大学基础创新科研基金(中央高校基本科研业务费专项资金)(2011121049,2012121030);国家自然科学基金(61001013,61102136,61202012);福建省自然科学基金(2011J05156,2011J05158,2013J05099)资

Hierarchical Traffic Sign Recognition by Super-Resolution Transfer

道路交通标志识别系统是智能交通系统的重要的组成部分。在无人驾驶、驾驶辅助系统、道路资源控制系统等领域，道路交通标志识别的研究都有着非常重要的实际应用价值和科学研究意义。然而，自然场景中的交通标志受光照、视点及遮挡等因素影响极大，多类交通标志的识别依然是一个极具挑战性的问题，特别是面向实际应用的多类交通标志识别对算法的实时性和识别精度都有极高的要求，是解决交通标志识别问题的瓶颈。为了克服这些困难，本文主要针对以下两点进行研究：（1）数据不平衡的多类交通标志分类问题。（2）小尺度交通标志的多类分类问题。本文的主要贡献如下： （1）提出了一种层次化的交通标志识别方法。交通标志类别多且数据不平衡，采...Traffic Sign Recognition (TSR) is a significant part of Intelligent Transportation System, having already played an important role in manless driving system, driver assistance system, and road resource control system. The research of traffic sign recognition contributes immeasurably to both practical application and scientific study. However, the traffic signs in the natural scenes are greatly inf...学位：工学硕士院系专业：信息科学与技术学院_工程硕士(计算机技术)学号：2302014115320

Study on the delay aversion in childreh with attention deficit hyperactivity disorder

【目的】探讨注意缺陷多动障碍(attention deficit hyperactivity disorder,ADHD)儿童持续注意及反应抑制特征,为临床诊治提供参考依据。【方法】运用持续注意反应任务(SART)对100名ADHD儿童及对照组儿童进行测试,采用多变量方差分析/协方差分析对持续注意及反应抑制能力进行统计。【结果】总的来说,两组儿童在持续注意及反应抑制功能上差异有统计学意义(P<0.001)上明显地多于对照组儿童,所需反应时(P【Objective】 To determine the characteristics in cognitive domain of sustained attention and response inhibitionl domain children with attention deficit hyperactivity disorder（ADHD）.【Methods】 One hundred children with ADHD and 100 healthy controls matched in age,gender,grade,handedness were measured with sustained attention response to task（SART） involing ability of suatained attention and response inhition.The performance was compared using multivariate analysis of variance（MANOVA） and MACOVA with FIQ controlled for between two groups.【Results】 The omnibus MANOVA of the primary neuropsychological variables revealed a large group effect with P0.001.The ANOVAs of each index showed that children with ADHD made more omission errors（P=0.004） and commission errors（P0.001） than did healthy controls.Furthermore,the reaction times（RT） of correct response（P0.001） in children with ADHD were much longer than that in healthy controls,and the variability of RT much more than the latter（P=0.001）.The results remainded unchanged arter controlling for FIQ.【Conclusion】 There are significant deficits of sustained attention and response inhibition in children with ADHD

Isolation and Function Analysis of NtWRKYY1Transcription Factor Gene in Narcissus tazetea var.Yunxiang

为明确WRKY转录因子在云香水仙中的功能,该研究以云香水仙为材料,克隆了WRKY基因,命名为NtWRKYY1(GenBank登录号为KX0564; 95)。序列分析显示,NtWRKYY1基因开放阅读框(ORF)长度为510; bp,编码169个氨基酸。多序列比对和系统进化树分析显示,NtWRKYY1编码蛋白含1个WRKY结构域和C_2H_2锌指结构(Cx_4Cx_(2; 3)HxH),与AtWRKY57聚在一起,属于第Ⅱc类WRKY转录因子。组织表达和时空表达分析显示,NtWRKYY1基因在花中表达量高于根和叶,; 且在花瓣及副冠中的表达量随开花过程(花蕾期、始花期、盛花期、衰败期)呈上升趋势。植物激素和非生物胁迫分析显示,NtWRKYY1基因受脱落酸(AB; A)、高温、干旱和盐诱导,受茉莉酸甲酯(JA)抑制,表明NtWRKYY1基因可能在云香水仙花朵的衰老过程中起正调节作用,同时参与云香水仙ABA、; JA等激素信号转导及高温、干旱、盐碱等非生物胁迫过程的调控。利用In-Fusion克隆技术成功构建过表达载体pMDC140-NtWRKYY1,并; 采用农杆菌介导叶盘法转化烟草。RT-PCR和GUS染色结果显示,目的基因已成功导入烟草基因组中。WRKY transcription factors play an important adjusting role in the; process of plant growth and development,hormone signal transduction and; abiotic stress response.To clarify the gene Narcissus tazetea; var.Yunxiang,we cloned the NtWRKYY1gene(GenBank accession; No.KX056495)based on Yunxiang,analyzed the gene sequence; features,evolutionary relationship and expression characteristics,; constructed the expression vector before transformed into; tobacco.Sequence analysis revealed that the length of NtWRKYY1gene open; reading frame(ORF)is 510bp,encoding apolypeptide of 169amino; acids.Multiple alignments and phylogenetic analysis showed that; NtWRKYY1protein containing one WRKY consecutive structural domain and; C_2H_2type zinc finger(Cx_4Cx_(23)HxH)belong toⅡc sub-group of WRKY; transcription factor together with Arabidopsis AtWRKY57.Tissue-specific; expression and temporal and spatial expression showed that; NtWRKYY1inYunxianghad a much higher expression in flowers than that in; roots and leaves,and a rising express trend in petal and corona of; alabastrum stage,early flowering stage,full bloom stage and faded; stage.NtWRKYY1can be induced by abscisic acid(ABA), high; temperature,drought and saline,and restrained by methyl; jasmonate(JA)through hormones and abiotic stresses analyzing.We can; concluded that NtWRKYY1gene may play a regulating role during the flower; senescence process inYunxiang,involve in the hormone signal transduction; of ABA,JA and the abiotic stress regulation of high temperature,drought; and saline at the same time.In addition,we constructed overexpressing; vector pMDC140-NtWRKYY1using In-Fusion cloning technique,transformed; into tobacco by the method of Agrobacteriumthough leaf disc; transformation.The carrier of PCR and GUS staining results indicated the; resistant plantlets were positive.This study will make a good foundation; for further exploring the function of the WRKY transcription factor; inYunxiang.福建省种业创新与产业化工程项

Molecular Cloning and Its Transformation of ACC Synthase NtACS1Gene from Narcissus tazetta var.Yunxiang'

为探究多花水仙ACS基因的序列特征及功能,以云香'水仙盛花期花瓣为试验材料,根据云香'水仙花朵转录组数据信息,通过RT-PCR方法克隆出1个AC; S基因,命名为NtACS1(GenBank; KX082936);NtACS1开放阅读框(ORF)长度为552bp,编码183个氨基酸。编码蛋白质分子量约为20.6KDa,理论等电点为6.3; 0,不稳定系数为65.49,属于不稳定的疏水性蛋白。通过qRT-PCR对云香'水仙不同时期花瓣和副冠中的NtACS1基因进行了表达分析,得到与云; 香'水仙花朵转录组数据中相同的结果:NtACS1基因在云香'水仙花瓣和副冠中的表达都是随着花衰老过程呈现逐渐下降的趋势,且NtACS1基因在花瓣; 和副冠中的表达峰值都在花苞期,表明; NtACS1基因编码的蛋白是在乙烯生物合成途径的系统1发挥催化作用的ACC合成酶。成功构建了NtACS1基因的正义植物表达载体,并通过农杆菌介导; 法获得8株转基因烟草,PCR和RT-PCR检测显示其中有6株为阳性植株,初步证实NtACS1基因已导入烟草基因组中且在烟草中已表达。该研究结果为; 进一步分析NtACS1基因的功能和后续转化水仙延长其花期研究奠定了基础。Aimed to study the characteristics and functions of ACSgene,in the; present study,we cloned a 1-aminocyclopropane-1-carboxylate synthetase; gene named NtACS1(GeneBank KX082936)based on the RNA-Seq database from; the flower of Narcissus tazetta var.Yunxiang'using RT-PCR method.The; length of the open reading frame(ORF)of ACSis 552bp,encoding 183amino; acids coupled with a molecular weight of 20.6kDa and theoretical; isoelectric point of 6.30.qRT-PCR analysis showed that the relative; expression level of NtACS1both in petals and coronas are decreased; gradually along with the aging of flower.Moreover,the expression data of; NtACS1gene were consistent with those obtained by RNA-Seq, implied that; the NtACS1protein as an ACC synthetase might play a role in the; catalytic system 1 of ethylene biosynthesis.Furthermore,sense plant; expression vectors of NtACS1were successfully constructed with; agrobacterium mediated transformation,and 6positive transgenic tobacco; plants were ultimately obtained. Our current study will lay an; experimental foundation for the future application of the genetic; transformation to prolong florescence ofYunxiang'.福建省种业创新与产业化工程项