基于改进的ID3算法的嵌入式Web服务单元测试策略

本文介绍了嵌入式面向服务的体系结构(简称SOA)环境下web服务测试的难点,提出了一种基于改进的ID3决策树算法的测试用例生成方法,并将其与接口单元测试工具--Nunit结合进行实验验证,结果表明该方法一种有效的测试策略

iRadio 流媒体播放器的设计与实现

3G 移动网络的推广和WiFi 的普及，使移动流媒体播放器成为消费电子领域的热门产品。本文首先给出了 iRadio 流媒体播放器系统软硬件的总体设计，并针对嵌入式产品的系统资源匮乏，特别是缓冲区不足的情况，提出一种利用 RTP/RTCP 通信协议实现的缓冲区控制策略。最后针对传统的数码相框只能播放本地相片和网络图片传输速度较慢的问题， 设计了一套利用Web Service 进行传输加速的网络数码相框解决方案。厦门市科技计划项目（3502Z20082002）；厦门大学"211"工程经费资助项

基于改进的ID3 算法的嵌入式Web 服务单元测试策略

本文介绍了嵌入式面向服务的体系结构（简称SOA）环境下web 服务测试的难点，提出了 一种基于改进的ID3 决策树算法的测试用例生成方法， 并将其与接口单元测试工具--Nunit 结合进行实 验验证，结果表明该方法一种有效的测试策略

Neural network model based on hybrid algorithms and its application in runoff for ecasting

为了提高径流预报的精度,采用一种基于粒子群和遗传的混合方法同时优化人工神经网络结构、连接权和偏置,在进化过程中采用训练样本和验证样本共享适应度技术,并以此建立径流预报模型。通过对柳州径流实例分析,并与离子群优化的人工神经网络模型、遗传进化的人工神经网络模型和时间序列模型方法对比,研究结果表明,该方法学习能力强、泛化性能高和有效提高系统预测的准确率,为获得更高预测精度的径流预报提供了一种有效的建模方法。In order to improve the accuracy of runoff forecasting,a hybrid algorithm combining PSO and GA algorithm with optimizing artificial neural network structure,connection weights and bias was proposed and used to establish a runoff forecasting model.This hybrid algorithm adopts training samples and validation samples to share fitness in the evolutionary process.The algorithm was compared with two forecasting models including PSO-ANN and GA-ANN through the actual examples of Liuzhou runoff forecasting.The results show that the new approach has strong learning ability and high generalization performance and can improve the accuracy of forecasting system effectively.Thus,it is an effective modeling method to get high precision of runoff forecasting.国家自然科学基金资助项目(61202143;51065002;11161029

Experimental technique on infrared radiation in wake of blunt cone in high-enthalpy tunnel

介绍在JF-10氢氧爆轰驱动高焓激波风洞中开展再人流场红外辐射测量的实验技术。风洞试验状态的驻室总压为19．6MPa，驻室总温为7920K。实验以球头钝锥体为试验模型，测量其近尾流红外辐射能量通量的横向分布。测量采用插入式锑化铟多元红外成像系统，波段范围为2．27-6．0μm。试验数据呈现明显的规律性。试验结果表明：利用这一测量技术能够提供高焓条件下有较高空间分辨率的、较为准确的红外实验数据

LED Color Analysis

主要对蓝光、绿光、白光lEd的色度特性进行分析,首先通过单色仪,分别测得蓝光、绿光、白光lEd的相对光谱功率分布并以色度学理论为基础,计算出光源主波长、色纯度、色温和显色指数.计算结果表明:蓝光lEd和绿光lEd主波长随标准光源的不同变化不大,色纯度比较高,分别在0.64和0.87左右,一般显色指数为-29和-14,显色性很差,不适合用来做照明光源.白光lEd主波长随标准光源的不同变化较大,色纯度相当低,接近0,一般显色指数为82,显色性很好,完全符合照明光源的要求.In order to study the color characteristics of light-emitting diode,the characteristics of blue,green and white LED colors are analyzed.Firstly,the spectral power distribution of blue,green,white LED is respectively measured by using the monochromator,and then on the basis of the theory chroma,the main light source wavelength,color purity,color temperature and color rendering index are calculated.The results show that blue LED and green LED dominant wavelengths change little with different standard light sources,and the color purities are relatively high,at 0.64 and 0.87,respectively,the general color-rendering is very poor for the index of-29 and-14,so these blue and green LED are not suitable to be used as lighting source.White LED dominant wavelength largely change with different standard light sources,and color purity is relatively low,near 0,color rendering is good for the general color-rendering index of 82, so white LED is in full conformance with the lighting requirements

木麻黄低效林不同发育阶段小枝养分和热值动态

对福建东南沿海防护林木麻黄低效林不同发育阶段小枝中养分(氮、磷)状况、内吸收率和热值的比较研究表明,木麻黄低效林小枝中氮含量分别高于正常林中相应发育阶段的小枝,而磷的含量在幼嫩小枝中低效林高于正常林,在成熟和衰老小枝中正常林高于低效林;低效林氮的内吸收效率稍低于正常林,而磷的内吸收效率则高于正常林;正常林和低效林小枝中的N:P比都高于16;低效林幼嫩和衰老小枝中的热值与正常林差别不显著,而低效林成熟小枝中的热值高于正常林。国家“十一五”科技支撑计划项目(2006BAD03A14-01);; 福建省重大科技专项(2006NZ0001-2);; 福建省森林培育与林产品加工利用重点实验室资助项

Seedling emergence and dispersal pattern of the introduced Sonneratia caseolaris in Shenzhen Bay, China

海桑(Sonneratia caseolaris)是我国华南沿海主要红树林造林树种,在深圳湾引种造林15年后,在天然红树林和光滩中出现了大面积的扩散。为了研究深圳湾红树植物海桑的幼苗扩散及其与生态因子的关系,作者采用样线和样方调查法于2006年9月至2007年9月对深圳福田红树林内天然扩散的海桑幼苗的密度、高度和盖度及其相关生态因子(包括种间竞争、群落类型、光照、扩散距离与滩面高程)进行了6次调查。天然红树林和人工海桑林林下海桑幼苗密度在调查初期分别为24.7棵/m2和19.7棵/m2,到2007年9月林下的一年生海桑幼苗全部死亡,说明林下的弱光生境显著抑制了海桑幼苗的早期生长和自然更新。不同林型下(包括天然白骨壤林和秋茄林、人工海桑林)的海桑幼苗的密度、高度、盖度差异不显著(P>0.05);而林中空地各指标显著高于林下(P0.05),而人工海桑林林下的海桑幼苗密度与光照强度呈显著正相关,且相关系数逐次增大,说明海桑幼苗的早期生长受到光照强度的影响极为显著。因此,深圳湾引种海桑的繁殖体在天然白骨壤林和秋茄林下的扩散主要受与母树距离的影响,但在海桑人工林下光照强度是影响幼苗分布的最重要生态因子。Due to its rapid growth, Sonneratia caseolaris, a mangrove species indigenous to Hainan, was introduced to Shenzhen Bay, Guangdong for afforestation purpose during the early 1990s. The seedling emergence, early growth and dispersal pattern of S. caseolaris and their responses to environmental factors have not been well studied in the new habitat. In this study, we evaluated the density, height and coverage of S. caseolaris seedlings underneath the canopies of various mangrove forests (including both natural Kandelia candel and Avicennia marina communities and introduced S. caseolaris communities) and on the mudflats without canopy, in Futian Mangroves Natural Reserve of Shenzhen Bay from September 2006 to September 2007. Line intercept and square intercept methods were used in the survey. Tidal elevation, light intensity, community types and the distance between the sample squares and the nearest adult S. caseolaris were also recorded. The mean densities of S. caseolaris seedlings under the canopies of both the introduced and natural mangrove forests decreased from September 2006 (24.7 seedlings per m2 and 19.7 seedlings per m2 , respectively) to September 2007 (no seedlings survived). No significant differences were found in the seedling density, height or coverage of S. caseolaris among different mangrove communities. However, the density, height and coverage of S. caseolaris seedlings were significantly higher on the mudflats without canopy than under the mangrove canopies, indicating that higher light intensity in on the mudflats without canopy promoted the dispersal and vertical growth of S. caseolaris seedlings. Although the optimal tidal elevation for S. caseolaris seedlings in Shenzhen Bay was between 1.40 m and 1.60 m, an area that falls within the mid-to-high intertidal zones, seedling density and tidal elevation were weakly correlated. The seedling density under the native mangrove canopies was negatively related to dispersal distance. However seedling density were positively correlated with light intensity(P<0.05), and the correlation coefficients for the introduced S. caseolaris forest increased through time with successive surveys. In contrast, there was no significant correlation founded between seedling density and light intensity under native mangrove canopies. We concluded that distance to mother tree was the most important factor determining S. caseolaris seedling density under native mangrove canopies, whereas the light intensity was the most important environmental factor for controlling seedling dispersal pattern under the canopy of the introduced S. caseolaris forest.中国科学院“百人计划”资助项目;; 国家自然科学基金(30700092);; 中国博士后科学基金(20060400529

木麻黄低效林不同发育阶段小枝单宁含量

为了探讨环境条件对单宁生产的影响,该文选择木麻黄低效林三个不同发育阶段的小枝进行单宁含量的测定。结果表明:在不同的发育阶段,总酚含量表现为幼嫩>成熟>衰老小枝,缩合单宁中除纤维素结合缩合单宁外,均表现为随小枝成熟而下降,随小枝衰老而升高;在低效林中的各单宁组分均高于对照。对环境条件比较敏感的幼嫩小枝和受环境胁迫较重的低效林比对照小枝中单宁含量高,表明不良的环境条件促进了单宁的形成。国家“十一五”科技支撑计划项目(2006BAD03A14-01);; 福建省重大科技专项(2006NZ0001-2);; 福建省森林培育与林产品加工利用重点实验室资助项

Seasonal dynamics of nitrogen and phosphorus concentrations,and nutrient resorption efficiencies of Casuarina equisetifolia branchlets in Dongshan County,Fujian

对福建东山赤山林场短枝木麻黄纯林小枝中的n和P含量、n∶P比、养分再吸收率的季节动态进行研究。结果表明,随着小枝的成熟和衰老,各季节n和P的含量依次降低,其中衰老小枝中n和P含量分别为(3.97±0.21)~(8.64±0.58)Mg·g-1和(0.04±0.03)~(0.10±0.03)Mg·g-1,基本上表现为n和P的完全再吸收。成熟小枝n∶P比的季节动态介于(18.67±3.24)~(37.98±1.32)之间,均高于16,表明木麻黄的生长受到不同程度的P限制。n、P再吸收率的季节变化分别为(51.02±4.66)%~(63.00±8.61)%和(81.24±5.08)%~(91.78±5.84)%,P再吸收率显著高于n。n和P的再吸收率之间以及成熟叶中n、P含量与二者再吸收率之间没有显著相关性,但在衰老叶中存在显著负相关,表明养分再吸收程度越高,其再吸收率就越高。因此,木麻黄通过小枝衰老过程中的养分再吸收,减少养分的损失,从而适应贫瘠的立地条件。Seasonal dynamics of nitrogen and phosphorus concentrations,N∶P ratios and nutrient resorption efficiency of Casuarina equisetifolia branchlets was studied at Chishan Forestry Center of Dongshan County,Fujian Province,China.The results showed that N and P concentrations were highest in young branchlets and decreased with maturity and senescence.N and P concentrations of senescent branchlets ranged from (3.97±0.21) to (8.64±0.58) mg g-1 and (0.04±0.03) to (0.10±0.03) mg g-1,respectively.N∶P ratios of mature branchlets ((18.67±3.24)--(37.98±1.32)) were all above 16 through the year,showing P was more limiting than N.Nitrogen resorption efficiency (REN) and phosphorus resorption efficiency (REP) were from (51.02±4.66)% to (63.00±8.61)% and from (81.24±5.08)% to (91.78±5.84)% through the year,respectively,and REP was significantly higher than REN.There is no significant correlation between REN and REP.REN is not correlated with either N concentration or N:P ratios in mature branchlets,no correlation was also found between REP and either P concentration or N∶P ratios in mature branchlets.While the significant negative correlation was observed in senescent branchlets.国家“十一五”科技支撑计划资助项目(2006BAD03A14-01);福建省科技重大资助项目(2006NZ0001-2);国家林业局南方山地用材林培育重点实验室资助项