摘要：太湖蓝藻已经成为一个社会和政府共同关注的环境问题,如何及时、准确地获取蓝藻发生、发展状况信息,是目前水环境监测的难点.本文以MODIS遥感图像为监测信息源,提出一种新的彩色图像分析方法快速提取太湖蓝藻信息.首先使用模板匹配算法快速提取MODIS遥感图像的太湖水域信息,并针对遥感图像获取过程中的云层覆盖干扰,提出将图像分为无云覆盖和有薄云覆盖两类分别处理的方法,提高了不同天气情况下蓝藻信息提取的有效性.最后通过对一年内多幅太湖MODIS遥感图像的蓝藻信息提取,定性分析了太湖蓝藻的时空分布特点,为研究太湖蓝藻发生、发展规律提供技术支撑.%Cyanobacteria bloom-forming in Taihu Lake has already become an environmental problem which is concerned with the whole society and the government. It is difficult for the department of water-environment monitoring to monitor the bloom on the lake timely and accurately. By using template matching process, the territorial waters information of Taihu Lake is extracted firstly. To tackle the problem of Cyanobacteria under clouds cover, the problem is divided into two, one is under the clouds cover, the other is under no clouds. Experimental results on hundreds of MODIS images show that the proposed method is effective with satisfactory accuracy. Furthermore, spatio-temporal analysis of Cya- nobacteria during the year 2006 reveals the underlying knowledge of its year pattern, which can provide decision support information for the administrative departments.
摘要：以沪深300股指期货推出后的实际交易数据为基础,综合运用OLS、MDM、VECM、GARCH模型对包括股票型、混合型、指数型开放式基金的套期保值效果进行实证分析.实证结果表明国内股指期货用于基金套期保值的效果是显著的.从套期保值效率和动态VaR值这两种基金绩效评价指标的研究结果看,指数型基金的套期保值效果明显优于其他类型的基金,短期内运用静态模型的套保效率优于动态模型的套保效率.%The paper uses the CSI 300 stock index futures market after the actual transaction data, makes a comprehensive use of the OLS, the MDM, the VECM, the GARCH model to analysis hedge effect of the equity open-end fund, the hybrid open-end fund and the index open-end funds. The empirical results show that the effects of domestic stock index futures for hedging of the fund are significant. From both Hedging efficiency and dynamic VaR value results, we find that the index fund of hedge is better than other types of funds, short-term use of hedging efficiency of the static model is better than the dynamic model hedging efficiency.
摘要：针对工业窑炉对温度的严格要求,设计了一种基于K型热电偶的可远程监控的8路温度采集与控制系统.该系统由上下位机两部分组成.PC机作为上位机,采用组态软件编写可视化界面,对工业现场温度实现远程监控.以STC89C52为核心的单片机作为下位机,根据上位机发送的指令执行相应的动作.实验结果表明,该系统测温范围大,测温精度高,稳定性好,易于扩展,能很好地满足工业窑炉温控需求.%According to strict requirements of industrial furnace temperature, the paper designs an eight temperature acquisition and control system who can be remotely monitored based on type-K thennocouple. This system is composed of master machine and a slaver machine. PC is master machine whose visual interface is written by configuration software, and can remotely monitor temperature of the industrial locale. A slaver machine whose core is STC89C52 SCM executes a corresponding action. Experimental results show that this system has wider measuring temperature range, higher temperature measurement precision, better stability and easy extensibility and can meet industry kiln needs of temperature control.
摘要：In relation to the ontology described by OWL, the paper firstly introduces the architecture of common ontology reasoners, then some built-in inference schemas in Jena semantic Web framework are explained in details. Meanwhile, the technique called reasoner cascading is also introduced in order to improve the capability of a single reasoner. Taking a mini-ontology as an example, we explore the ontology inference by using Jena buih-in inference schemas and the outer reasoner Pellet.%针对OWL所描述的本体,介绍了本体推理机的构成,重点阐述了Jena语义Web编程框架中内置的几种推理模式,并通过叠加外部推理机Pellet来弥补单一推理机在推理能力方面的不足.以一个小型本体为例,通过运用Jena内置的推理模式和叠加外部推理机的方式对本体的推理进行了探索和验证.
摘要：详细地分析了四阶非线性蔡氏电路系统的动力学性质,给出系统的Lyapunov指数图、分岔图和功率谱等,确定了相应的混沌运动和周期运动区域,从而为电路模拟提供了依据.此外,基于Multisim电路仿真软件,设计出四阶蔡氏系统的电路模型,获得了单涡卷和双涡卷的混沌吸引子,验证了数值仿真的有效性.%In this paper, the dynamics analysis of four-order Chua' s circuit was investigated through the Lyapunov exponent, bifurcation and power spectrum, which developed the corresponding domain for chaotic motion and periodic motion. Furthermore, the four-order Chua' s circuit was designed through the Multisim circuit simulation software, and then the single or two-scroll chaotic attractors were given. The results are presented to demonstrate the effectiveness of the proposed method.
摘要：为提高遗传算法求解旅行商问题的效率,提出了一种改进量子交叉算子遗传算法.与经典量子全干扰交叉算子中城市的选择完全依赖于其位置的选择策略相比,新算子在选择城市时加入了父代优质解的有用信息,从而在维持解的多样性的同时,提高交叉所产生新解的质量.仿真算例结果表明,改进交叉算子遗传算法有着良好的全局搜索和局部挖掘能力,针对TSP问题的最优解、平均解均优于传统算法.%In order to improve the efficiency of Genetic Algorithm (GA) to Traveling Salesman Problem (TSP), an improved quantum crossover is proposed in this paper. Compared with the traditional quantum crossover in which a city is selected according to the position, the new crossover selects a city depending on the distance comparing. The new cross- over can maintain the diversity of population and generate higher quality solutions. Simulation result shows that the im- proved quantum crossover based GA has good ability in global exploration and local exploitation. The best solution and the average solutions on TSP are all superior to those of traditional algorithm.
摘要：A simple automatic code generation method which is based on the metadata of data table is presented. In the beginning of the MIS system development, it can be used to automatically generate all database entity objects'create, delete, update, query function implementation codes, and to construct a runnable prototype based on SSH framework. Based on the code generator, the designer can do iterative design of the database. The MIS system is constructed to meet the needs of the users. Code generation templates can be customized to meet project's needs; the generated code can be used as the basis of the MIS system to save development costs and improve the quality of the code.%提出了一种简单易行的基于数据表元数据的代码自动生成方法,可以在MIS系统开发之初,自动生成所有数据库实体对象的增、删、改、查功能的实现代码,给用户构造一个基于SSH框架的可运行原型.基于代码生成系统,设计人员可多次进行数据库的迭代设计,开发出符合用户需要的MIS系统.代码生成模板可以根据项目需要进行定制,生成的代码可作为MIS系统最终实现的基础,节约开发成本,提高代码质量.
摘要：A new topological structure of photovohaic inverter is proposed. It has a simple structure, and has the ability to step up/down conversion and adapt to wide voltage range compared with the one-stage PV grid-connected inverter. Then, one-cycle control based on ARM is introduced with lower power consumption, smaller size and higher accuracy compared with the traditional one-cycle control. Finally, the control strategy is confirmed to be correct and effective by the results of simulation and experiment.%提出了一种光伏逆变电源的新型拓扑结构，该结构简单，相对于单级式并网逆变器具有升、降压的特性，能够适应较宽的电压范围．介绍了基于ARM实现的数字单周期控制，与传统的模拟单周期控制相比，具有功耗更低、体积更小、精确度更高等优点．最后通过仿真和实验验证了该方案的正确性与有效性．
摘要：In this paper, a novel muhiuser and multi-service(MUMS) scheduling algorithm in the new ultra-high throughput (NUHT) wireless local area network (WLAN)system is proposed to meet the system performance requirements, which conducts a hierarchical scheduling of users and services based on a comprehensive analysis of quality of service(QoS) requirements, queue state information ( QSI ) and channel state information ( CSI ). The simulation results show that the proposed MUMS algorithm achieves a higher total throughput, a smaller packet loss rate as well as a good support of the QoS requirements and guarantees the fairness among users compared with the existing scheduling algorithms.%针对超高速无线局域网的系统性能要求，提出了一种新的超高速无线局域网多用户多业务MUMS（Multi—us”andMulti—service）调度算法．基于对不同业务的服务质量QoS（Quality of Service）要求、用户信道状态信息CSI（Channel State Information）及服务队列信息的综合分析，此算法对业务和用户进行分层调度．仿真结果表明，在满足不同业务QoS需求且保证用户公平性的同时，提出的调度算法能有效地降低丢包率，提高系统吞吐量．
摘要：This paper investigates the issue of quantized controller for discrete-time markovian jump systems with unreliable communication channel. Firstly, by exploiting a discrete Lyapunov function and using the convexity property of the matrix inequality as well as Jessen inequality, new criteria are derived which are less conservative. Secondly, based on the obtained conditions, the gain of quantized controller can be easily obtained through Matlab in terms of linear matrix inequalities (LMIs). Finally, a numerical example is provided to show the effectiveness of the proposed theoretical results.%研究了具有不可靠通信通道的离散时间markovian跳变系统的量化控制问题．首先，构造离散Lyapunov函数，利用矩阵不等式的凸性以及线性矩阵不等式技术，得到具有较小保守性的稳定性条件；其次，根据线性矩阵不等式技术求解量化反馈控制器设计的增益，稳定性条件和控制器增益设计最后转换成线性矩阵不等式方程的求解，通过matlab可以很容易实现；最后通过数值例子来例证所述方法的有效性．
摘要：当前的部分多标签分类算法本质上由两项分类技术级联而成，前一级建立标签排序系统，后一级检测相关标签，兼顾进一步改善分类性能．本文针对不同标签检测技术开展研究，收集并实现4种通用标签检测技术：线性回归阈值法、多输出线性回归法、Logistic回归法以及离散Bayes规则，以k近邻算法作为基线算法，在10个基准数据集上进行实验比较．实验结果表明，从计算时间与分类性能两个方面来说，多输出线性回归法是值得推荐的方法．%Now some multi-label classification methods cascade two different classification techniques in essence. The former is to build a label ranking system, and the latter to detect relevant labels effectively and improve classification performance further. To compare the different detection techniques, we collect four general label detection approaches : linear regression threshold, multiple output linear regression, logistic regression and discrete Bayesian methods. With k-nearest neighbor algorithm as a baseline method,we conduct an extensive experimental comparison on ten benchmark data sets. Our experimental results demonstrate that multiple output linear regression technique is recommendable, according to both computational time and classification performance.
摘要：The paper introduces an improved method on background extraction and update based on the features of background extraction and the disadvantages of the low aecurancy of mean algorithm and the bad real-time of mixture Gaussian model. The method obtains the initial background with probability distribution and statistics of histogram to reduce the impact of environmental changes. Then to increase the real-time and accurancy,it combines the Gaussian distribution with recursive algorithm to update the background. Compared with means algorithm and mixture Gaussian model,it is easier to be operated, has better real-time and aecurancy, and can effectively inhibit the noise caused by the slow targets.%在分析背景提取的特点、均值算法准确度低和高斯混合模型法实时性差等不足的基础上，提出了一种改进的背景提取和更新的算法．该算法通过结合概率分布和统计直方图来得到初始背景，以降低环境变化的影响；利用高斯分布和递归算法来提高区域背景更新的实时性和准确度．结果表明，与均值算法和混合高斯模型法相比，该算法实现简单，具有很好的准确性，并且抑制了目标运动过慢造成的干扰，提高了背景更新的实时性．
摘要：介绍中频炉的基本原理并建立了钢厂非线性负载中频炉系统的仿真模型，在分析现有谐波治理方案和此系统产生谐波特点的基础上，采用改进的谐波检测方法检测谐波电流，基于某钢厂中频炉谐波治理选用混合电力滤波器来解决此系统的谐波问题，该方法具有成本低、可以综合补偿电能质量的优点，实际结果证明了该方法的有效性．%The paper introduces the basic principle of medium frequency induction melting furnace, and builds up the steel mills nonlinear load of intermediate frequency furnace system simulation model. Based on the analysis of the existing harmonic treatment schemes and tile harmonic characteristics produced by the system,through technical economic analysis, the paper chooses a mixture of active power filter system to solve the harmonic problem. This method is lower in cost has the advantages of compensating comprehensive power quality. The actual results prove the effectiveness of this method.
摘要：设计了一种基于无线传感网的血氧实时监测系统．该系统采用ZigBee芯片CC2530为网络节点，以MSP430FG439单片机为系统核心，能够同时监测多个受测者的血氧饱和度，并可通过上位机以图形化方式直观地显示血氧变化曲线．实验结果表明，该系统拥有较高的血氧值检测精度，数据通过无线网络传输稳定可靠，能够满足一般性多用户同时进行血氧浓度实时监测的要求．%This paper focused on the design of real-time oxygen monitoring system based on wireless sensor networks. The system uses ZigBee chip CC2530 as network nodes, and MSP430FG439 microcontroller as the core. It is able to monitor multiple blood oxygen saturation simultaneously through the host machine in graphical way. A large number of experimental results show that the system has a high accuracy on the oxygen value detection,reliable data transmitting over the wireless network ,it can meet the general requirements of multi-user's real-time monitoring of the oxygen concentration.
摘要：Since there are some shortcomings of precision in traditional Function Point Analysis method in the process of dividing complexity grades, a functional testing size estimation model is produced based on the fuzzy Function Point Analysis method. This model can be available for selecting an appropriate Value Adjustment Factor in order to estimate testing size rightly. Finally, a detailed flow of estimating testing size is given.%针对传统功能分析法在复杂度等级划分上的缺陷，提出一个基于模糊功能点分析方法的软件功能测试规模估算模型．在应用功能点分析方法进行测试规模估算时选择适合软件测试领域的规模因子进行调整．最后给m了软件功能测试规模估算流程．
摘要：将经不同含量马来酸酐（MAH）改性的纳米碳酸钙以5％的比例填充聚丙烯（PP），制得PP／nano-CaCO3复合材料，并对复合材料的表面性能和机械性能进行了测试．接触角和表面性能的测试结果表明，加入适当的MAH可有效提高复合材料与水的接触角，降低复合材料的表面能和极性、色散数值．机械性能的测试结果表明，复合材料的机械性能随碳酸钙中MAH加入量的增加而提高．SEM的测试结果表明，各样品中纳米碳酸钙在树脂中的分散情况良好．%PP was filled with 5wt% Nanometer calcium carbonate( CaCO3 )that was modified on various content maleic anhydride(MAH). Mechanical properties and surface characteristics of pure PP and a series of CaCO3-modified-MAH/ PP composites were researched. The results of optical video contact angle and surface energy testing showed that the com- posites had lower surface energy, polar and dispersion value when it was modified on MAH. The results of impact and stretch experiments showed that the mechanical properties of composites increased with content of MAH in composites increased. The photos of SEM showed that the nano-CaCO3 in various samples was dispersed well in resin.
摘要：In view of the existing non-linearity, time-variation and unsteadiness of idling process in gasoline engine and the difficulty in obtaining a good performance by traditional PID control, an idling PID control based on fuzzy neural network is proposed. A control platform combining fuzzy control, neural network and PID control is applied in idling control of gasoline engine. We set up a radial basis function(BP) neural network model. The dynamic BP algorithms of three layers forward networks is adopted. By the function of self-learning and adaptability the weights of BP network and the parameters of PID are adjusted in real time to a group of kp ,kl and kd suitable for the idling control, therefore the self- adaptation and intelligent control of the engine idling PID control can come true. The experimental result shows that PID controller based on BP neural network adjusting has such better control performance as quick response and good robustness, and decrease idling speed fluctuation and that it improves obviously the stability of idling operation.%针对汽油机怠速工况的非线性、时变性和不确定性，传统PID控制难以获得理想控制效果的问题，提出一种基于模糊神经网络的PID控制方法，将模糊控制、神经网络与PID控制相结合，给出了BP神经网络模型，采用3层前向网络，动态BP算法，利用神经网络的自学习和自适应能力，实时调整网络的权值，改变PID控制器的控制参数，整定出一组适用于PID控制的kp、ki、kd参数，实现汽油机怠速PID控制的自适应和智能化控制．实验结果表明，采用BP神经网络整定的PID控制，控制响应快、鲁棒性强，可减小怠速波动，提高汽油机怠速的稳定性．
摘要：The accuracy of sun-tracking methods for heliostats is one of the most important factors that influences the efficiency of solar tower power plant. Regarding the motion laws for heliostats in solar tower power plant, a model of motion trails for heliostats is developed with optical reflection principle. Based on the relative location between heliostats and the receiver, simulations of motion trails for heliostats of a city in West China are performed under the solar position algorithm on Spring Equinox and Winter Solstice. The results show motion laws for heliostats in solar tower power plant.%定日镜在追日过程中的聚光精度是影响塔式太阳能热发电系统工作效率的重要因素之一．分析了塔式太阳能热发电系统中定日镜的运动规律．利用光学反射原理建立定日镜运动轨迹模型，并以我国西部某市作为算例，根据太阳轨迹运算法则以及定日镜与吸热器之间的相对位置，对该地春分日与冬至日定日镜的运动轨迹进行仿真与分析，得到所仿真定日镜的运动规律．
摘要：One-cycle control is a kind of control strategy of analog power technology which is widely used. It has such merits as simple structure, rapid control speed and so on. Analog circuit is always used to form control circuit. In this paper ARM is used to realize one-cycle control. The components of one-cycle control circuit such as the integrator, comparator, RS flip-flop and other hardware circuits are realized by ARM. Finally, compared with one-cycle control which is realized by analog circuit, they are similar in the characteristics of dynamic performance.%单周期控制是模拟电源技术中一种被广泛使用的控制策略，它具有结构简单、调控速度快等优点，通常使用模拟电路构成控制电路，利用ARM控制芯片实现数字单周期控制，单周期控制电路中的积分器、电压比较器、RS触发器等硬件电路均用软件实现，最后与模拟电路构成的单周期电路相比较发现其在动态性能方面具有相似的特性．
摘要：提出一种利用液晶空间光调制器实现二维光场偏振态编码与偏振态选择的方法，其基本思想是通过控制液晶空间光调制器上加载的灰度值改变出射光波的偏振态．对液晶空间光调制器改变光波偏振态的能力进行了研究，利用在空间光调制器不同区域上加载不同灰度对入射光波进行偏振态编码，在输出端实现了以偏振态作为条件进行选择输出．实验结果表明，该方法通过灰度编码能够产生包含两个偏振方向正交的出射光场，并且所组成的偏振选择衍射系统能够实现对衍射光场的偏振态选择．%A method to achieve 2-D polarization-encoding in the light field and polarization-selection based on liquidcrystal spatial light modulator(LCSLM)is proposed. The basic idea is to change the polarization state of output light wave with the gray-level working on LCSLM. The capability of changing the polarization distribution of a light field based on LCSLM is studied in this paper. We encode the polarization state of incident beam with different gray levels working on LCSLM's different areas, so different output informations with different polarization states could be obtained. The experimental results show that the method can generate a light flied obtained two orthogonal polarization directions based on gray-level encoding,and the polarization-selective diffraction system can realize polarization-selection of the diffractive field.
摘要：The subcutaneous blowhole is one of defects in nodular cast iron, and its formation mechanism has no final conclusion in the area of foundry technology. Because non-metallic inclusion always transfers in metal liquid together with bubbles, we believe that determinations of magnesium in different inner parts of a casting will be helpful in analyzing the motion paths of bubbles migration. The testing results have shown that the magnesium content gradually increases from the surface to the center of the casting, and the oxide film has shown enrichment of magnesium and sulfur. Our study shows that the oxide films hinder the bubbles to transfer outward and those stranded bubbles form subcutaneous blowholes. Increasing of carbon equivalent will raise the graphitization expansion property, and in the meanwhile accelerate the bubbles transfer, so, the subcutaneous blowholes will be avoided.%皮下气孔是球铁件常见的铸造缺陷之一，其形成机理至今说法不一．既然非金属夹杂物伴随气泡一并迁移，那么，检测铸件各部位的镁含量势必能够追踪到气泡的迁移路径，从而能够对其运动过程作出分析．检测结果表明，铸件内部的镁含量由外而内呈梯度增加，铸件表面的氧化皮中富含镁元素．研究表明，皮下气孔由不能外逸的气泡形成，其外逸阻力来自于已经凝固的氧化膜，提高碳当量有助于增强石墨化膨胀能力，从而存氧化结膜前将气泡尽快挤出金属液，避免皮下气孔的产生．
摘要：With the car manufacturing as an example, the article introduces the principle of the depainting technology in fluidized bed incineration, the operating parameters dealing with different materials, the flue gas treatment technology caused by burning and material cracking time. The article proposes that the heat friction gasification adhering materials be taken to complete paint stripping treatment based on compressing the natural gas to stream and heat quartz sand. Compared with traditional process, this process has many advantages:reducing the emission rate and lowering processing cost,and no secondary pollutants. Moreover,with the same scale of treatment,30% of the fixed investment can be saved.%以轿车制造领域为例，介绍了流化床焚烧脱漆技术的原理，及处理不同物料时的操作参数、焚烧所导致的烟气的处理工艺、物料裂解时间等；提出了以压缩天然气流化并加热石英砂为基础，采用热摩擦、气化剥离方式完成脱漆处理．与传统工艺相比，尾气排放速率降低，处理成本降低；无二次污染物；同样处理规模，固定资产投资节省30％．
摘要：This paper analyzes a principle of one-cycle control, and proposes a one-cycle control for fully rated converter of permanent magnet synchronous generator (PMSG)wind power system on grid-side. With the output current as integral reference and grid voltage as the comparative reference,the output current is always tracking the output voltage. It aims to automatically adjust power factor and can effectively inhibit DC bus voltage fluctuation from impacting output voltage,and to improve low voltage ride-through(LVRT) capability of PMSG wind power system. The model and its control strategy are created in PSCAD/EMTDC. The simulation results show the correctness and validity of one-cycle control strategy.%对单周期控制进行了理论分析，进而提出了基于单周期控制的直驱永磁同步风力发电系统全功率换流器网侧控制策略．该方法采用输出电压作为参考量，输出电流作为积分量，实现输出电流跟踪输出电压，以达到自适应功率因数校正的目的，且能有效抑制直流母线电压波动给输出电压带来的影响，提高了永磁同步风电系统的低电压运行能力．就其控制策略在PSCAD／EMTDC中创建了仿真模型，仿真结果表明了单周期控制策略的正确性和有效性．
摘要：现实活动中，存在大量的需要由多人合作才能完成某项工作的情况．针对两人合作共同加工一批工件，每人有一台加工机器，每个工件只需加工一次，工件加工时间是开工时间的线性函数的问题建立数学模型，考虑以最小的最大流程时间作为加工成本，确定这批工件的一个划分，把工件分配给两台机器加工．该划分方案不仅考虑到合作双方的效率，而且充分体现公平性原则，从而使双方对相应的合作（加工）收益分配满意，愿意合作．%In the real world, there exist many situation where many persons need cooperate in order to complete a project. We establish a mathematical model of the problem where two persons process a batch of jobs by cooperation. Each person offers a single machine and each job with linear processing time of its starting time just needs to be processed once. If we define the minimized maximum flow time as a processing cost, determine a division of these jobs which not only considers the efficiency of each person but also embodies the fairness principle, to yield a reasonable cooperative (processing)profit allocation scheme acceptable to them.
