Vehice-Logo Recognition Using Discriminative K-SVD Algorithm

随着现代化智能城市的发展，车辆在现代化的生活中扮演着重要的角色。车辆自动识别系统作为智能交通系统和智能住宅小区系统的重要组成部分，引起了国内外研究工作者的广泛关注，而车牌识别和车标识别是其重要组成部分。本文重点对车标识别进行研究，内容包括车标定位与识别。由于车标的多样性以及目标区域小，车标定位仍然是一个技术难点，目前尚无成熟的应用系统，对它的研究有重要的科学和应用价值。 稀疏表示具有最简洁的表示信号能力，本文在对稀疏表示理论深入研究的基础上，提出了基于稀疏表示的车标识别算法，该算法包括车标定位和车标识别两个模块内容，主要针对国内道路行驶的中小型车辆，研究了车标自动识别系统的关键技术，在保证车...With the development of modern intelligent city , vehicle plays an important role in modern life.As an important part of the automatic vehicle identification system and and the smart residential area system, intelligent transport systems have caused widespread concern in domestic and foreign researcher,and license plate recognition and vehicle logo recognition is an important component.This articl...学位：工程硕士院系专业：信息科学与技术学院_电子与通信工程学号：2312011115301

Case study on support of foundation pit near Qiantang River

通过对临钱塘江某工程基坑支护实例的分析与论述,探讨了当基坑开挖具有较强补水边界、基坑内部地下水较高时,其合理的设计与施工方案。现场监测结果表明,本文提出的支护设计和施工方案是切实可行的。Based on the description and analysis of an example of foundation pit support engineering near the Qiantang River,the reasonable design and construction schemes were discussed for the foundation pit which has high level of ground water due to the seepage flow pressure.The proposed support design and construction scheme were proven to be effective by on-the-spot monitoring results

Foundation pit precipitation design and construction analysis for two-flank shaped "urban balcony" project of Qianjiang New City

针对杭州钱江新城两翼"城市阳台"工程的基坑具有开挖面大,场地内地下水位较高,基坑南侧由于濒临钱塘江而具有极强的补水边界等特点,探讨和比较了可应用于该场地的基坑降水设计和施工方案。施工效果和现场监测表明,应用本文所述的降水方案达到了预期效果,保证了基坑开挖顺利施工。For the two-flank shaped"urban balcony"project of Qianjiang New City of Hangzhou City,in view of such characteristics as large excavation area for pit foundation,high ground water level within the site,and there is a strong make-up water limit as the south side of the foundation pit faces Qiantang river,the foundation pit precipitation design and construction scheme are discussed and compared.The construction result and the site monitoring showed that by application of the abovementioned precipitation scheme,the expected result was reached,and the smooth excavation and construction of the pit foundation was ensured

Theoretical Analysis and Experiment on Flow Allocation Characteristics of Dual Discharging Axial Piston Pump

通过改变缸体结构、柱塞数、端盖油路、配流盘形状等,设计了双排油内外环并联配流结构的轴向柱塞泵,实现了单柱塞泵两路高压供油。针对单环柱塞数减少,腔; 内压力冲击增大,脉动变大等问题,对配流结构进行重新设计。在排油腰形槽和吸油腰形槽过渡区取消卸荷槽,利用加大配错角,在排油完毕未接通吸油时,腔内封; 闭体积增大,未排尽的高压油液压力降低;在吸油腰形槽和排油腰形槽过渡区,排油卸荷槽利用阶梯变化通流面积代替原连续变化的通流面积,削弱了卸荷槽几何形; 状要求。重新设计后的双排油配流结构,以45mL轴向柱塞泵结构为参考,对配流结构进行了理论分析,建立了双排油轴向柱塞泵仿真模型。以单柱塞腔内压力; 冲击、输出流量进行分析研究,得外环压力冲击小,与传统配流结构相比较双排油输出口压力脉动变化率变小,并试制双排油轴向柱塞泵。对试制泵进行压力脉动测; 试、容积效率测试和噪声测试,结果表明,与45mL轴向柱塞泵进行对比,压力脉动降低了约30%,噪声也降低,容积效率不低于0.92。该双排油轴向柱; 塞泵可以代替双联泵,使系统结构简化,能耗降低。When providing two-way independent high-pressure high-flow oil sources,; hydraulic system generally adopts two separate piston pumps or coaxial; ones in series, causing complex structure and high cost. Therefore,; single piston pump was proposed to achieve two-way high-pressure oil; supply. Axial piston pump was designed with dual discharging inter-outer; ring parallel allocation structure by changing cylinder structure,; piston number, cap circuit and valve plate shape. Flow allocation; structure was redesigned due to decreased single ring piston number,; increased pressure shock and fluctuation in the chamber. Relief notch; was cancelled in transition region from oil-discharging to oil-absorbing; waist slots. After that, mismatch angle was increased to enlarge closed; volume in chamber and reduce the pressure of unexhausted high-pressure; oil in the interval between oil extraction and absorption. In transition; region from oil-absorbing to oil-discharging waist slots, stepped flow; area was used to replace original continuous flow area to weaken; geometry requirements of relief notch. The optimized dual discharging; flow allocation structure was conducted with theoretical analysis to; establish dual discharging axial piston pump simulation model based on; 45mL axial piston pump structure. There was small pressure shock in; outer race by analyzing pressure shock and output flow in single piston; chamber. Compared with traditional flow allocation structure, dual; discharging oil output had smaller pressure fluctuation rate. Based on; this, the designed dual discharging axial piston pump was piloted. The; pilot dual discharging oil pump was compared with the original 45mL; pump through pressure fluctuation, volumetric efficiency and noise; tests. Result showed that the former had lower pressure fluctuation; (decreased by 30%) and noise level, while its volumetric efficiency was; not smaller than 92%. In general, the dual discharging axial piston pump; can replace duplex pump to simplify system structure and reduce energy; consumption. This new pump can also be used in closed circuit and; differential cylinder hydraulic systems to make the system simpler and; cost-effective.山西省自然科学基金项目; 国家自然科学基金项

心房颤动患者左心耳功能及血流动力学计算机建模仿真的研究进展

心房颤动(简称房颤)是临床常见的心律失常,发病率高,且患病率随年龄增加而逐渐升高。发生房颤的原因包括冠状动脉心脏病、风湿性心脏病二尖瓣狭窄、甲状腺功能亢进等,还有一些不明原因的特发性房颤。房颤最常见同时也是最严重的并发症是左心房尤其是左心耳附壁血栓脱落后引起的血栓栓塞,由此导致的缺血性脑卒中是房颤患者致

Design and Implementation of Intelligent Home Control System Based on Android and Arduino

作为时下最炙手可热的移动应用端操作系统,Android以其显著的开放性、便于开发的灵活性、能够与Google应用的无缝对接性及丰富的第三方软硬件; 资源等成为智能应用系统不可或缺的组成部分;Arduino单片机系统以其开源的电子原型平台、灵活便捷的设计和丰富的传感器资源等被广泛应用。其与Ja; va和C语言相类似的基于; Wiring/Processing的语言开发环境更是受到越来越多的电子爱好者和开发者的青睐。本文以移动手机安卓系统为无线控制终端,结合Ardui; no单片机系统,设计并实验仿真了一款基于Android与Arduino的智能家居控制系统,以控制; LED灯示例,通过网络http传输控制指令到Arduino单片机系统,Arduino根据所接收到的指令,控制不同的家居电器完成所要求的工作任务。; 仿真实验表明,文章所设计方法行之有效,可以灵活的运用到日常家居电器设备,提供了一种智能家居系统设计的新思路,具有易实现,应用广的特点。As one of the most sought-after mobile application terminal operating; system, Android has become an indispensable part of the intelligent; application system, because it has the features of definite openness,; flexibility for development, perfect connection with Google applications; and abundant third party software and hardware resources and so on.; Arduino MCU system is widely used in society because of its; characteristics of open source electronic prototype platform, flexible; and convenient design, rich sensor resources, etc. Moreover, its classes; Java and C language based on Wiring/Processing development environment; are becoming more and more popular among the electronics enthusiasts and; developers. Taking the mobile phone Android system as wireless control; terminal, and combining Arduino MCU system, an intelligent home control; system based on Android and Arduino is designed and implemented in this; paper. By controlling LED lamp samples, with the network HTTP; transmission control instructions sending to the Arduino MCU system, and; according to the received instructions, Arduino can control different; household electrical appliances to complete the required tasks.; Experiments show that the methods designed in this paper can be flexibly; applied to daily household appliances, such as, home appliance control,; security equipment, etc. This paper provides a new idea for the design; of intelligent home system, which is easy to implement and widely used.2015年度"福建省高校杰出青年科研人才培育计划"项目; 2015年福建省高等学校创新创业教育改革项目;; 2016年本科高校重大教育教学改革研究项目; 2016年省级互联网实验教学示范中心项目; 2016年福建省高等学校服务产业特色专业建设项

Polishing of Laser Lift-off-Induced GaN Surface

激光剥离(llO)技术是研制新型氮化镓(gAn)基谐振腔结构光电子器件的关键技术。然而llO后的gAn表面往往具有较大的粗糙度,而制作谐振腔结构器件需要很高的表面平整度,因此需要对llO后的gAn表面进行抛光。分别采用金刚石粉抛光液和胶粒二氧化硅抛光液进行机械抛光和化学机械抛光(CMP),并对比了两种方法获得的抛光结果,研究发现前者会在抛光后的gAn表面引入划痕,而采用后者可以得到亚纳米级平整度的表面。进一步的实验结果表明,胶粒二氧化硅抛光液同样适用于图形化衬底外延片激光剥离后的gAn表面抛光。Laser lift-off( LLO) is a key technology in development of new GaN-based resonant-cavity optoelectronic devices.For cavity-dependent devices,a smooth surface is highly required.However,the GaN surface after LLO is usually rough,and the polishing is necessary.The mechanical polishing of diamond powder and the chemical mechanical polishing of colloidal silica were compared.It is found that diamond powder leads to scratches on the GaN surface whereas colloidal silica leads to smooth surface with sub-nanometer roughness.The experiment results indicate that polishing with colloidal silica solutions can be applied to smoothen the LLO-produced GaN surface from an epitaxial wafer grown on patterned-sapphire substrate.国家自然科学基金资助项目(61274052;61106044); 中国科学院纳米器件与应用重点实验室开放课题资助项目(14ZS02

A Silver Nanoparticle-Enhanced Fluorimetry for Determination of Trace Enrofloxacin in Water

在实验条件下建立了水溶液中痕量恩诺沙星的荧光分析方法;在课题组已有工作的基础上,采用“绿色“化学方法合成了银纳米粒子;研究了所制得的银纳米粒子对水溶液中恩诺沙星荧光行为的影响,并最终建立了水溶液中痕量恩诺沙星的银纳米粒子增强荧光分析方法。Firstly, a fluorimetry for determination of trace enrofloxacin in water was established in laboratory conditions.Secondly, the silver nanoparticle was synthesized based on our previous studies.In addition, effect of silver nanoparticle on the fluorescence behavior of enrofloxacin in water was investigated.Finally, a silver nanoparticle-enhanced fluorimetry for determination of trace enrofloxacin in water was also established.国家自然科学基金项目;项目号:21207103; 浙江省大学生科技创新活动计划暨新苗人才计划;项目号:2013R413010; 浙江省公益项目;项目号:2012C31025

Infection Status and Influencing Factors of Human Papillomavirus in Patients with Condylomata Acuminata

目的了解我国内地尖锐湿疣（CA）患者的人乳头瘤病毒（HPV）感染状况,并探讨其影响因素。方法系统检索Pub Med、Science Direct Online、中国知网、万方数据知识服务平台、维普网中关于我国内地CA患者HPV检测的文献,检索时间均为1990年1月—2013年12月。根据样本量对各文献HPV感染率进行加权合并,计算CA患者的HPV及各基因型合并感染率,并分析不同研究年份、研究地区CA患者的HPV合并感染率,采用多因素Logistic回归分析探讨CA患者感染/检出HPV的影响因素。结果共纳入文献67篇,累计CA患者10 757例,感染HPV 9 328例（86.7%）。CA患者的HPV合并感染率为95.7%〔95%CI（95.2%,96.2%）〕,其中合并感染率较高的前3种基因型为HPV6/11〔81.2%,95%CI（77.1%,85.2%）〕、HPV6〔43.8%,95%CI（35.2%,52.5%）〕、HPV11〔38.3%,95%CI（32.8%,43.8%）〕。1990—2003、2004—2013年CA患者的HPV合并感染率分别为96.6%〔95%CI（95.8%,97.5%）〕、94.6%〔95%CI（94.0%,95.3%）〕;东、中、西部患者的HPV合并感染率分别为95.1%〔95%CI（94.4%,95.7%）〕、91.7%〔95%CI（89.3%,94.1%）〕、96.5%〔95%CI（95.4%,97.6%）〕。多因素Logistic回归分析结果显示,研究年份、研究地区、标本类型、诊断方法是CA患者感染/检出HPV的影响因素（P〈0.05）。对不同基因型进行分析,结果显示,研究年份、研究地区、标本类型、诊断方法是CA患者感染/检出HPV6的影响因素,研究年份、研究地区为西部、标本类型、诊断方法是CA患者感染/检出HPV11的影响因素,研究地区为中部、标本类型是CA患者感染/检出HPV16的影响因素,研究地区、标本类型、诊断方法是CA患者感染/检出HPV18的影响因素（P〈0.05）。结论我国内地CA患者的HPV感染以HPV6、HPV11基因型为主,感染率近10年来有所下降,东部地区感染率较高。病理检查确诊、采用剥落细胞进行DNA检测,可以提高CA患者的HPV检出率。Objective To study the infection status of human papillomavirus（HPV） in patients with condylomata acuminata（CA） in mainland China and explore its influencing factors. Methods The literatures on HPV detection of CA patients in mainland China published between January 1990 and December 2013 were systematically retrieved from Pub Med,Science Direct Online, China National Knowledge Infrastructure, Wanfang Data Knowledge Service Platform, and the VIP database. According to the sample size,HPV infection rates of each literature were weighted and combined and the infection rates of HPV and the combined infection rate of each genotype of CA patients were calculated,and the combined infection rate of HPV of CA patients in different years and areas of study was analyzed. Multivariate Logistic regression analysis was used to investigate the influencing factors of CA patients infected / detected with HPV. Results A total of 67 literatures were included in the study. The number of CA patients accumulated to 10 757,and 9 328 cases（86. 7%） infected with HPV. The combined infection rate of HPV in patients with CA was 95. 7% 〔95% CI（95. 2%,96. 2%） 〕,and the top three genotypes with high infection rate were HPV6 /11 〔81. 2%,95% CI（77. 1%,85. 2%） 〕, HPV6 〔43. 8%,95% CI（35. 2%,52. 5%） 〕, HPV11〔38. 3%,95% CI（32. 8%,43. 8%） 〕. The combined infection rate of HPV in patients with CA between 1990 and 2003 and between 2004 and 2013 was 96. 6% 〔95% CI（95. 8%,97. 5%） 〕and 94. 6% 〔95% CI（94. 0%,95. 3%） 〕respectively;the combined infection rate of HPV of patients in eastern, middle and western areas was 95. 1% 〔95% CI（94. 4%,95. 7%） 〕,91. 7% 〔95% CI（89. 3%,94. 1%） 〕,and 96. 5% 〔95% CI（95. 4%,97. 6%） 〕respectively. Multivariate Logistic regression analysis showed that the year of study,areas of study,type of specimen and methods of diagnosis significantly influenced the infection and detection of HPV in CA patients（P 0. 05）. After analyzing different genoty福建省自然科学基金青年项目（2014J05097

曲锥前体/内转进气道一体化设计与试验研究

介绍了曲锥前体/内转进气道一体化的设计方法,针对进气道侧壁外扩角这一设计因素,设计了具有不同捕获形状的两套一体化构型,并完成了两套模型在马赫数Ma=6.0、0°迎角状态下的风洞试验及数值模拟对比。结果表明,基于该一体化设计方法,曲锥前缘产生的初始入射激波在设计状态下能够完全封闭进气道唇罩,进而起到抑制唇罩溢流和提高一体化构型流量捕获能力的效果。在设计条件下,进气道侧壁外扩角的增加有助于减少侧壁产生的溢流,从而提高一体化构型的流量捕获能力。同时,外扩角的增大将导致下游反压前传速度加快,从而恶化进气道的内部流场并降低一体化构型的反压特性。因此,设计此类一体化构型时,需要考虑外扩角对捕获流量和进气道出口性能的综合影响,选择合适的进气道侧壁外扩角度以达到设计需求。国家自然科学基金项目(51606161,91441128,11602209)中央高校基本科研业务费专项资金项目(20720170055