Moving Object Detection Based on Subspace Learning

在计算机视觉、机器学习和模式识别等领域中，运动目标检测一直都是一个热门的研究方向，受到学术界和工业界的广泛关注。运动目标检测主要是通过视频序列来检测场景中的前景运动目标，如：走动的行人、行驶的车辆、行进的船只等。运动目标检测不但可以直接应用到实际场景中，而且也可以为目标识别、目标跟踪和行为分析等后续的视频处理提供基础。因此，运动目标检测在智能监控和智能人机交互等应用中具有重要的研究意义和实际价值。但是由于视频序列来自于现实场景，存在着许多干扰性因素，因此运动目标检测问题面临着诸多挑战。另一方面，子空间学习是近年来比较受关注的研究课题，其通过将高维数据降维到低维子空间中来实现快速准确地分析数据。...In computer vision, machine learning and pattern recognition, moving object detection has always been a popular research direction, and has received extensive attention of academia and industry. Moving object detection is mainly to detect the foreground moving objects in the scene by using the video sequences, including the walking pedestrians, driving vehicles, moving boats and so on. The moving ...学位：工学硕士院系专业：信息科学与技术学院_计算机科学与技术学号：2302014115316

On the Legal Regulation of Validity of Contract

市场经济的主要内容是商品交换，而商品交换大都是通过合同这一形式来完成的。市场主体之所以选择合同这一形式就在于法律赋予合同以强制执行的效力。合同的有效、无效不仅仅涉及到当事人双方的利益，更会影响到整个社会财富的流转。那么法律是如何赋予合同以相应效力的？合同效力的法律规制机制是什么?这是本文所要讨论的主要问题。本文除引言与结语外共分四章：第一章为合同效力法律规制概述。第一节先给出合同效力法律规制的定义，随后分析了合同效力法律规制的两个阶段──法律对合同的评价与法律对合同效力的设置之间的关系，最后分析了合同效力法律规制的特征。第二节通过对与合同效力法律规制相关概念的界定，形成对本文所讨论的合同效力的...The main content of the market economy is commodities exchange and the exchange is mainly completed through contract. The reason why contract is chosen as a dealing form by market participants is that contract is vested with the enforceable validity by law. That whether the contract is valid or invalid not only involves the interests of both contracting parties, but also influences the circulation...学位：法律硕士院系专业：法学院法律系_法律硕士(JM)学号：20030822

A Study on Business Model Evolution Based on Genetic Algorithm

随着竞争的日益激烈、技术进步的不断加快，商务模式逐渐成为企业关注的焦点，通过商务模式创新来建立自己的竞争优势成为企业的内在追求。本文在介观商务模式的概念框架以及基于复杂系统理论的商务模式创新的理论研究基础上，将商务模式创新视为动态的演化过程，进而分析商务模式的创新规律。 本文在商务模式NK模型和广义NK模型的基础上，首先应用遗传算法研究商务模式模块创新，建立基于遗传算法的商务模式创新模型，分析具有不同复杂性的商务模式的演化规律。其次，为了进一步研究商务模式结构对创新的动态影响，同样将商务模式结构进行编码参与演化过程，来分析在激进创新视觉下的商务模式创新规律。最后，本文引入自适应遗传算法，动态...With the increasing of intense competition and constantly stepped-up technological progress, the business model has been paid more and more attention by enterprises. To establish their own competitive advantages through business model innovation become enterprise's intrinsic pursuit. Based on the concept framework of mesoscopic approach to business model and the study of business model in...学位：工学硕士院系专业：管理学院管理科学系_系统工程学号：1772006115137

由“爬树”到“攀树”浅谈攀树运动的命名之争

本文旨在通过厦门大学开设的"爬树课"来引出文章的主题"体育运动"方面。通过研究英语单词"Tree Climbing"以及研究古代对于"攀"这个字在中国历史典籍中的出处和典籍中的具体含义探索"攀树"和"爬树"的细微区别,以此达到充分认识理解两个词语的含义。从"攀"和"爬"的中国五千年汉字演变过程来研究这项具有悠久历史的运动,体现中国古代文字演变的独特魅力,感受"攀树运动"在中国古代文字中的具体体现。最后通过"攀树"和"爬树"和树木的关系上区别二者

洪泽湖大型底栖动物群落结构及其与环境因子的关系

洪泽湖是我国第四大淡水湖,然而关于洪泽湖大型底栖动物的报道较少。为了研究洪泽湖大型底栖动物群落结构特征及其影响因子,在洪泽湖设置20个采样点,进行了为期1周年的季度调查(2010年5月-2011年2月)。共采集到大型底栖动物14种,寡毛类、摇蚊科幼虫和软体动物分别有5种(占总物种数的35.7%)、3种(21.4%)和6种(42.9%)。河蚬为第一优势种(优势度Y=0.18),其次分别为苏氏尾鳃蚓(0.09)、羽摇蚊(0.07)、霍甫水丝蚓(0.06)和铜锈环棱螺(0.06)。群落的平均密度和平均生物量分别为(45.45±7.38)个/m2和(52.43±12.04)g/m2,其中软体动物平均密度和平均生物量最高[(24.80±6.20)个/m2和(49.55±11.94)g/m2],摇蚊类次之[(13.76±2.87)个/m2和(2.28±0.71)g/m2],寡毛类最低[(6.96±2.41)个/m2和(0.60±0.18)g/m2]。全湖Shannon-Wiener、Margalef和Pielou指数分别为2.69、1.10和0.71,各指数季节差异不明显。冗余分析(RDA)结果共解释物种数据累计方差的35.0%;MonteCarlo检验表明,洪泽湖水体中硝酸盐氮、总氮和化学耗氧量是影响底栖动物群落分布最关键的环境因子(F=2.181～3.277,P<0.05)

Numerical study on suspended sediment concentration in Jiulong Estuary-Xiamen Bay and sediment transport mechanism in tidal inlets with multi-fork

基于环境流体动力学模型(Environment Fluid Dynamic Code/EFDC)水动力和泥沙模块,该文针对九龙江口-厦门湾水域潮动力强、浅滩面积大的特点建立二维潮流泥沙数学模型并利用实测数据进行校验。模型精简适用,成功反演了该水域的水动力场和悬沙浓度场,并能正确反映浅水区域的水沙运动特征。结果表明:在潮流作用下,厦门湾水体中悬沙浓度由外向内递增,悬沙随着潮流的涨落在湾内外作中-长距离的往复运动。湾内特别是浅滩区,大潮期悬沙浓度大于小潮期且浓度随潮变化明显,小潮期悬沙场则较为稳定。采用抓斗式挖泥船(源强Q=7.5 t/h)在翔安东南侧浅滩疏浚作业对邻近保护区基本无影响,但翔安南部"五岔口"型潮汐汊道存在能远程输运近岸疏浚泥沙的"泥泵式"水动力场,促使形成环绕厦门岛东海域的带状悬沙分布,该文进一步揭示了形成该分布的水动力机制。增大疏浚强度可导致白海豚保护区被污染,悬沙带宽度增大,浓度上升。Based on hydrodynamic and sediment transport module of Environment Fluid Dynamic Code/EFDC, a 2-Dimensional mathematical model was applied to the simulation of tidal current and sediment transport in Jiulong Estuary-Xiamen Bay, which was set up with full consideration of the strong tide and large-area shoal in the study area. The model was calibrated and verified using observational data and the simulation results agreed with measured data well, which successfully re-acted the hydrodynamic field and suspended sediment transport in this area, including that of the shoal area. The research shows that, mainly controlled by tidal current, suspended sediment concentration(SSC) increases progressively from outside to inside of Xiamen Bay and suspended sediments move forth and back as tidal currents flow rectilinearly along channels. Inside the bay, especially in shoal area, SSC in spring season fluctuates tidally and is much higher than that in neap season which remains lower and more stable. Dredging in the shoal area positioned to the south east of Xiang'an using grab dredger with source strength of 7.5 t/h almost has no effect on the adjacent protection zone, however, the water area with five-forks positioned to the south of Xiang'an exists a dredge-pump-like hydrodynamic field, through which dredging-produced sediments can be transported in long distance. The special hydrodynamic field leads to the formation of ribbon-pattern distribution of suspended sediments located in the eastern waters of Xiamen island and the hydrodynamic mechanism of it is revealed. Amplifying dredging intensity can result in the pollution of White Dolphin Protection Zone, broadening of ribbon-pattern distribution and increasing of the SSC.国家自然科学基金项目(41406121)~

Application of Sol-gel Technology in Solid-phase Microextraction(SPME)

固相微萃取技术的萃取效率及应用范围主要取决于其涂层的选择。传统的固相微萃取涂层热稳定性、使用寿命都不理想,溶胶凝胶技术的引入不但增加了涂层的种类,而且增加了使用寿命,提高了其使用温度及抗溶剂冲洗能力,大大拓宽了固相微萃取技术的应用范围。Stationary phase is the key to determine the extraction efficiency and the range of application of SPME. The traditional coatings of SPME are unstable at high temperature. The sol-gel technology can overcome the typical drawbacks of SPME coating, increase its anti-solution ability and thermal stability and broaden its application scope.国家"863"资助项目(编号:2002AA639390

凡纳滨对虾内脏几丁质酶基因的克隆、序列分析与结构预测

几丁质酶是甲壳动物顺利完成生理性蜕壳的关键功能酶.已有研究表明几丁质酶是一个多基因家族.根据甲壳动物几丁质酶保守序列设计引物,应用反转录PCR方法从凡纳滨对虾(Litopenaeus vannamei)内脏中扩增得到部分几丁质酶编码基因片段,进一步结合RACE法,克隆得到该几丁质酶完整编码序列.生物信息学分析表明其含有信号肽序列、几丁质酶催化中心序列、PEST连接区和几丁质底物结合部位序列.序列比对发现其与中国对虾(ABB85237.1)、斑节对虾(AF157503.1)和日本对虾几丁质酶(BAA12287.1)具有很高的相似度

Application of Ionic Liquids in Extraction and Separation

室温离子液体是由正负离子组成的室温为液体的熔融盐,因其具有极低的蒸汽压、可设计性和特殊的选择溶解能力等独特的性质,使得其在萃取分离有机物及金属离子、液相微萃取和汽油柴油中脱硫及碱性氮化物等领域都有着广泛应用。综述了离子液体在萃取分离上的应用进展。Ionic substances with melting points close to room temperature were referred as room-temperature ionic liquids,which showed lots of unique properties,e.g.environmentally benign,nonvolatile,designable and were good solvents for a wide range of both organic and inorganic materials.Ionic liquids are widely used in extraction and separation processes,e.g.extraction and separation of metal ions and organic compounds,headspace liquid-phase micro extraction,removal of basic nitrogen compound from distilled diesel and desulphurization of gasoline.In this paper,the recent application of ionic liquids in extraction and separation were reviewed.教育部科学技术研究基金重点资助项目(207108

表面负载聚苯胺纳米线聚合物复合微球的制备及其防腐性能研究

采用分散聚合和\"受限聚合-原位生长\"法分别制备了聚甲基丙烯酸缩水甘油酯(PGMA)微球和PGMA@PANI(聚苯胺)复合微球,通过改变聚乙烯基吡咯烷酮(PVP)含量以及甲基丙烯酸缩水甘油酯(GMA)浓度实现对PGMA微球粒径和分散度的调控。在此基础上,通过改变苯胺(An)/PGMA、CTAB/An的比例、正戊醇的添加来调控PGMA@PANI复合微球的形貌。结果表明,在0.10g/mL GMA、10%(wt,质量分数,下同)PVP、50%十六烷基三甲基溴化铵(CTAB)和30%An条件下,可得到均匀负载PANI纳米线的聚合物复合微球。以复合微球为防腐助剂制备环氧型防腐涂料的测试结果显示:PGMA@PANI复合微球的添加量为4.5%时,防腐涂层耐盐雾时间为816h,耐盐水时间为960h,展现了较好的防腐性能和机械性能。福建省科技创新平台(2014H2006,2014I2005);;\n厦门市科技重大专项(3502Z20171002);;\n石墨烯技术研发和产业发展专项项目;;\n福建省科技重大专项(2018HZ0001-1