Design and Implementation of Parking Management System Based on B/S

现今停车场收费管理的数据量和信息类型越来越多，结构越来越复杂，出入场控制模式多种多样，停车计费方法灵活复杂，缴费方式也越来越多，原来传统上使用的收费员人工管理收费的方式难以适应，单机电脑管理的方式已无法适应多出入口同时工作的停车场。因此，必须开发应用一套能适应现代信息技术发展的现代化停车场管理系统。 与采用C/S模式系统从应用方面的优势进行比较分析，采用B/S模式的数据库应用起来会在使用的方便性上更有优势，相应系统的更新维护只需要针对服务器进行，也更便捷，只要在因特网或局域网范围内，可以随时随地增加客户端，不需要对客户端进行复杂的软件安装和配置。同时，停车场的收费管理系统采用基于B/S模式的...Today,the car parking system manage more and more data quantity and information type,the data and information become more complex. There is varied in and out control mode,Billing method become flexible and complex,Charging methods are more and more complex. In the original uses the tollkeeper manages the charge hard to adapt with difficulty artificially, Later used in the management of single comp...学位：工学硕士院系专业：软件学院_工程硕士(软件工程)学号：X201323024

Study on Tax Sources Risk Assessment Based on AHP-entropy Method — A Case of Binhai Real Estate Industry

为有效防范税源风险，全国许多税务部门都在开展税源风险评估的实践尝试，然而由于税源风险评估方法较为单一，存在主观性，通过风险评估结果对纳税人实施差别化管理，试图控制税源风险的效果不够理想。积极探索新的税源风险评估方法，科学客观地评估税源风险结果，具有积极的研究意义。本文考察了AHP-熵值法在税源风险评估中的可行性，以滨海市房地产业为例，首先构建了滨海市房地产业税源风险识别指标体系；其次依据AHP-熵值法对指标体系赋权重，然后再进行滨海市房地产业税源风险的识别、衡量与评估。本文认为基于AHP-熵值法的税源风险评估，能有效提高评估的准确性和风险应对指向的准确性，至少在房地产业中的考察如此。To effectively guard against the risk of tax sources, many of the tax authorities are in tax sources risk assessment practices. However, due to the tax risk assessment method is relatively single and subjective, the effect of trying to control the risk of tax sources through the implementation of diversified management to taxpayers according to the results of risk assessment is not ideal. It will ...学位：管理学硕士院系专业：公共事务学院_公共管理硕士(MPA)学号：1392011115033

Compressed Sensing Estimation of Underwater Acoustic MIMO Channels Based on Temporal Joint Sparse Recovery

多输入多输出(MIMO)水声通信技术可以在极其有限的水声信道频带资源内提高信道容量,但多径和同道干扰的同时存在,使传统信道估计算法如最小二乘算法、压缩感知估计算法的性能急剧下降。考虑到通信数据块间水声信道多径结构存在一定的相关性,该文利用这种数据块间多径结构的时间域相关性建立水声MIMO信道的时域联合稀疏模型,并利用同步正交匹配追踪算法进行多个数据块联合稀疏恢复信道估计,提高MIMO信道多径稀疏位置的检测增益并抑制同道干扰,提高水声MIMO信道的估计性能。仿真和MIMO水声通信海试实验表明了所提方法的有效性。Multiple-Input-Multiple-Output(MIMO) under water acoustic communication is capable of improving the channel capacity in extremely limited bandwidth. However, the performance of traditional channel estimation algorithms, such as Least Squares(LS) method, Compressed Sensing(CS) method decreases rapidly because of the simultaneous presence of the Co-channel Interference(Co I) and multipath. As the sparse multipath structures between adjacent data blocks exhibit temporal correlation features, in this paper, the temporal correlation of sparse multipath structures is exploited to establish temporal joint sparse MIMO channel estimation model, and the Simultaneous Orthogonal Matching Pursuit(SOMP) algorithm is utilized for compressed sensing estimation of MIMO channels. Simulation and sea trial results validate the effectiveness of the proposed method.国家自然科学基金(11274259;11574258);; 福建省自然科学基金(2015J01172)~

Jointing sparse recovery estimation algorithm of underwater acoustic channels with long time delay spread

对具有长时延扩展的水声信道,传统的信道估计算法如最小二乘法将在大量零值抽头产生严重的估计噪声,导致估计性能下降,同时信道估计时所需的较高估计器阶数大大提高了运算复杂度。压缩感知信道估计方法可有效利用多径稀疏特性改善性能,但需采用较大的训练序列长度以保证稀疏恢复精度,由此导致额外的系统开销。利用水声信道多径稀疏结构在数据块间存在的相关性,建立基于分布式压缩感知的长时延水声信道联合稀疏模型,从而可利用同步正交匹配追踪算法进行联合重构,以进一步减小系统的训练序列开销,提高估计性能。最后通过仿真和海上实验验证了所提方法的有效性。Efficient estimation of underwater acoustic channels with a large time delay spread was addressed. For the conventional channel estimation methods such as LS, this type of channel estimation would produce serious estimation noise in zero-value taps which lead to poor performance of channel estimation. At the same time, a large time delay spread posed significant difficulties such as large channel order and the corresponding huge computation complexity. Compressed sensing(CS) channel estimation algorithm offered a solution to this problem by exploiting the sparsity of channel to improve the estimation performance. However, to ensure acceptable estimation performance, a long training sequence was needed, which unfortunately would cause additional overhead. A method was proposed which exploiting the joint correlation of sparse multipath structure between adjacent data blocks to deal with the estimation of long time delay channels under the framework of distributed compressed sensing(DCS).Thus the large time delay underwater acoustic channels can be jointly reconstructed by the simultaneous orthogonal matching pursuit(SOMP) algorithm to facilitate the system overhead reduction and estimation performance improvement. Simulation as well as the sea trial results indicate the effectiveness of the proposed method.国家自然科学基金资助项目(No.11274259,No.11574258)~

中国传统坩埚炼铅技术初探

坩埚炼铅法是中国传统炼铅技术中一种特别的冶炼方法,即在坩埚中用铁从硫化铅中还原出铅。本文梳理有关坩埚炼铅的文献资料,详细介绍该技术的冶炼过程,包括炉子的建造、坩埚的制作、配料、冶炼操作和金银的提取。另外,对近年来发现的两处古代坩埚炼铅遗址出土的坩埚和炉渣进行科学检测,以复原当时的技术。并与蒸馏法炼锌、坩埚炼铁等中国传统坩埚冶炼技术作比较,阐述坩埚炼铅的技术特征

Chemical constituents from root of Angelica decursiva

采用HP20大孔吸附树脂、ODS、硅胶柱色谱、Sephadex; LH-20柱色谱和半制备HPLC等色谱分离手段对紫花前胡的化学成分进行研究。结合理化性质及MS,NMR等谱学数据鉴定化合物的结构,从紫花前胡80; %乙醇提取物中分离并鉴定了12个化合物,分别是(9R,10R)-9-acetoxy-8,8-dimethyl-9,10-dihydro-2H,8; H-benzo[1,2-b: 3,4-b']dipyran-2-one-10-yl; ester(1)、补骨脂呋喃香豆精(2)、顺式-3',4'-二千里光酰基-3',4'-二氢邪蒿内酯(3)、(3'R,4'R)-3'-angelo; yloxy-4'-senecioyloxy-3',4'-dihydroseselicalipteryxin(4 )、(+; )-8,9-dihydro-8-(2-hydro-xypropan-2-yl)-2-oxo-2H-furo[2,3h]chromen-9-yl-; 3-methylbut-2-enoate(5)、libanoridin(6)、丝立尼亭(7)、花椒素(8)、crocatone(9)、peuja; ponisinol B(10)、peujaponisinol A(11)、ostenol(12)。其中,化合物1 ~; 5为首次从当归属植物中分离得到,化合物7 ~ 12为首次从紫花前胡中分离得到。The compounds were isolated and purified by HP20 macroporous adsorption; resin,ODS,silica gel,and Sephadex LH-20 column chromatography,as well as; semi-preparative HPLC chromatography from the 80% ethanol extract of the; root of Angelica decursiva, and their structures were identified based; on their physiochemical properties and spectroscopic data. Twelve; compounds were structures were identified as; (9R,10R)-9-acetoxy-8,8-dimethyl-9,10-dihydro-2H,8H-benzo[1,2-b:; 3,4-b']dipyran-2-one-10-yl ester (1),bakuchicin; (2),(3',S,4'S)-disenecioyloxy-3',4'-dihydroseselin; (3),(3'R,4'R)-3'-angeloyloxy-4'-senecioyloxy-3',4'-dihydroseselincalipte; ryxin (4),(+; )-8,9-dihydro-8-(2-hydroxypropan-2-yl)-2-oxo-2H-furo[2,3h]chromen-9-yl-3; -methylbut-2-enoate (5),libanoridin (6),selinidin (7),suberosin; (8),crocatone (9),peujaponisinol B (10),peujaponisinol A (11),and; ostenol (12),respectively. Compounds 1-5 were isolated from the plants; of Angelica genus for the first time. Compounds 7-12 were isolated from; A. decursiva for the first time

Study on a remote-control PWM drived mini car based on AT89C51

TX-2B编码的控制按键基带信号经ASK振幅键控后由30 MHz的载波发射,通过超再生接收电路再由RX-2B解码后,无线信号转化为数字脉冲信号并输入到AT89C51。从而控制单片机输出PWM信号,控制功率管驱动电路,配合直流电动机及现有玩具小车机械传动装置,实现遥控电动玩具车的前进、后退、加速、左右转等功能。The base-band signal,coded by TX-2B as the control key,is transmitted on 30 MHz carrier wave after being modulated with ASK.The wireless signal,after being decoded with RX-2B is transformed into digital signal and then sent to AT89C51 as the control signal.The PWM output from AT89C51 control the power driver of the DC motor,so the mini car,as the load of DC motor,can fulfill the functions such as forward or backward,left or right,even accelerate.福建省半导体及应用重点实验室开发课题基金资助项目(光子学研[2007]14号);; 福建省科技计划基金资助项目(2001I1021);; 厦门科技计划基金资助项目(3502Z20024006

Meter Digital Identification on Weighted Hardness Feature Matching

仪表数字识别是智能仪表应用的关键,针对现有方法对角度倾斜、半字识别效率低的问题,引入硬度特征参数来衡量数字图像目标区域在某方向上的抵抗变形的能力,提出了一种结合数字结构特征和统计特征的识别方法。通过对仪表盘上采集的数字进行分析,建立数字自上而下及自下而上的硬度特征库。并依据每个特征重要程度的不同,引入权重,采用加权特征匹配的方法进行数字识别。实验表明,算法不仅简单高效,对于整字和半字都能够取得很好的分割和识别效果,而且对旋转和畸变有较强的容错。Meter digital identification is crucial for intelligent meter application.Current methods have lower recognition ratio at presence of tilt angle and half-digits.In order to solve this problem,the hardness feature parameters are introduced to measure anti-deformation ability on the direction of the projection target area.A number identification method based on the combination of digital structure feature and statistical feature is presented.By analysising different height and different angle of the figures acquired from Meter,the template library of digital top-down and bottom-up hardness characteristics is established.Weights are set according to the different importance of characteristics and the digital recognition is realized by using the method of weighted feature matching algorithm.Experiments prove that the algorithm is simple and efficient to words or words in half and has strong fault-tolerant with rotation and distortion.国家自然科学基金资助项目(51179074);集美大学李尚大学科建设基金资助项目(ZC2001006/C511012

Underwater acoustic speech communication using time reversal and time-frequency differential ofDM methods

针对水声信道多径、时变、多普勒等恶劣传输特点对水声语音通信的严重影响,本文采用多通道时间反转和时频差分OfdM进行水声语音通信技术方案设计,该方法首先通过多通道时间反转进行时间域和空间域多径聚焦,进而结合时频差分OfdM调制解调抑制残留多径的影响。由于无需采用信道估计和均衡算法,系统实现方便、复杂度低,同时对信道具有一定程度的稳健性。该方法语音压缩编码采用混合激励线性预测编码。仿真实验和海试实验表明了本文方案的有效性。The difficulties of underwater acoustic channel, i.e., multipath, time varying and Doppler shifting pose significant challenges to underwater acoustic speech communication.In this paper, multi-channel time reversal is incorporated with time-frequency differential orthogonal frequency division multiplexing(ofDM)technology to design an underwater acoustic speech communication system, which enables time-frequency domain focusing of multipath by multi-channel time reversal, as well as suppressing of the residual multipath with time-frequency differential ofDM.Thus the employment of complicated channel estimation and equalization are avoided to facilitate the low complexity system implementation.In addition, the mixed-excitation linear predictive(MELP) is employed for speech encoding.The simulation and sea trial demonstrate the effectiveness of the method at presence of time varying multipath underwater acoustic channel.国家自然科学基金资助项目(11274259

Research on Time Reversal Spread Spectrum Underwater Acoustic Communication under Low SNR

直接序列扩频提供了一种低信噪比条件下水声通信的有效手段,但在低信噪比条件下直扩系统常用的信道均衡,rAkE接收机等抑制多径干扰方法性能下降。该文结合具有突出时间、空间聚焦能力的多通道被动时间反转技术与直接序列扩频抑制低信噪比条件下多径干扰的影响,并采用卷积纠错编码进一步提高通信性能。湖试结果证明了该技术方案的有效性。Direct Sequence Spread Spectrum(DSSS) provides an effective way for underwater acoustic communication under low Signal-to-Noise Ratio(SNR).However,low SNR will deteriorate the common multi-path mitigation approaches employed in DSSS system such as channel equalizer and rake receiver.Considering that multi-channel time reversal has the ability to refocus the energy in spatial and temporal domain,multi-channel time reversal is incorporated with DSSS technology to suppress the multipath interference under low SNR,also convolutional coding is adopted to further improve the communication performance.Lake trial results show the effectiveness of the proposed scheme.国家自然科学基金(10704063);福建省自然科学基金(2011J01275)资助课