Method of incrementing updating FreeCube

数据立方体是联机分析处理的一个重要应用。如何对数据立方体(CUBE)进行更新目前研究相对较少。给出了CUBE的一种新颖的存储结构——FreeCube的定义,该结构大大降低了CUBE存储的空间,分析了它的相关性质,提出了增量更新FreeCube的理论,并给出了具体的算法,以实例说明了该算法的正确性,总结了下一步的工作方向。Data cube is an important application in OLAP system. The study on how to update data cube lags behind at present. A kind of the novel structure of CUBE— — Free is described that can reduce the size of CUBE quickly. And then the characteristics of the con- strictive freecube is analyzed. The theory of incrementing updating freecube is proposed, and algorithm for it and then a instance to indicate the correctness of the algorithm is provided. At last, the directions in the future is summarized.福建省自然科学基金项目(A0310008);; 福建省高新技术研究开放计划重点基金项目(2003H043

SPT—Method of Fast Calculation FreeCube

文章首先分析了目前国内外数据立方体计算的研究现状,指出其优缺点。接着在free-set的概念上,给出了一系列相关定义,挖掘了free-set的性质,建立了FreeCube的概念结构。就FreeCube的计算而言,充分考虑到free-set的性质,结合BUC算法的特点,提出了高效的算法SPT(Selecting-PartitionandTrimmingComputationofFreeCube),并从多个角度进行了实验,与相关工作做了对比,说明该算法的优越性。First of all,the current domestic and international research situation of Data Cube calculation is analyzed.Then the thesis points out its merits and demerits.And it gives out a series of related definitions on the free-set conception,excavates the free-set property and establishes the concept construction of FreeCube.With regard to FreeCube calculation,fully considering the free-set characteristics while combining the characteristics of BUC’s calculation,the thesis puts forward an efficient calculation way SPT(Selecting-Partition and Trimming Computation of FreeCube),and while comparing with related work,it engages in experiments from many aspects,which illustrates the superiority of the algorithm.FreeCube maintenance problem is also discussed theoretically.福建省自然基金资助项目(编号:A0310008);; 福建省高新技术研究开放计划重点资助项目(编号:2003H043

LSNCCP:A Clustering Algorithm Based on the Largest Set of Not-Covered Core Points

聚类在数据挖掘、模式识别等许多领域有着重要的应用 提出了一种新颖的聚类算法 :一种基于最大不相含核心点集的聚类算法LSNCCP(aclusteringalgorithmbasedonthelargestsetofnot coveredcorepoints) 在密度定义的基础上 ,考察核心点之间的距离关系 ,定义相含、相交、相离这 3种核心点之间的关系 ,最后找出一个最大不相含核心点集 ,在此基础上进行聚类 ,并且找到解决丢失点问题的快速方法 该最大不相含核心点集只是全部核心点集合的一个很小的子集 ,因此有效地缩减了同类算法中搜寻核心点的时间 理论和实验上证明了这种算法的可行性和优越性Clustering is an important application area for many fields including data mining, pattern recognition, etc. In this paper, a novel clustering algorithm LSNCCP(a clustering algorithm based on the largest set of not-covered core points) is proposed. On the basis of the definition of density, the distance between the core points is discussed. And then, the three essential distance relation: covered core points, intersectant core points, and separate core points. Finally, the largest set of not-covered core points is found and based on the set the data can cluster very well. Because the largest set of not-covered core points is a lesser subset of the all core points, the new algorithm cuts short the time of searching all core points in the similar algorithms. The feasibility and the advantage or the new algorithm are proved in theory and experiment.福建省自然科学基金项目 (A0 3 10 0 0 8) ;; 福建省高新技术研究开放计划重点项目 (2 0 0 3H0 43

HBV整合的致癌性研究

HBV的4个亚基因产物中,HBx具有反式激活、介导细胞凋亡作用,HBs具有反式激活因子的作用。肝细胞癌(HCC)的发生与HBV的整合及整合后染色体重排有关。为探讨HBV整合及HBx、HBs亚基因在HCC发生中的可能作用,我们制备了HBV亚基因探针,并以此对肝细胞癌中HBV整合及亚基因转录进行了研究,以期为阐明HBV感染后HCC发生机制提供一定的实验资料和依据。本研究中,首先以BamHⅠ、BglⅡ酶切扩增回收的HBVDNA ,回收其HBV亚基因HBx、HBc、HBs、PreSDNA片段,以地高辛甙元随机引物法标记成敏感性与特异性俱佳的HBV亚基因探针,再以HBV探针点杂交检测HCC标本中HBVDNA的阳性率,对阳性的标本,继以Southern转膜杂交检测其整合情况,最后取HBVDNA阳性的HCC标本,按经典方法抽提其mRNA ,分别以HBV亚基因探针Northern转膜杂交检测亚基因的表达率。结果显示:4 4例HCC标本中,75 %的标本显示有HBVDNA的存在;Southern杂交分析,HBV纯整合型HCC为6 3.6 % ,混合型HCC为36 .4 % ,未见单纯游离型HCC标本存在;17例HBVDNA阳性..

Control method for aircraft wake vortex based on Rayleigh-Ludwig instability

在飞机飞行的过程中尾涡会伴随着升力产生,威胁后机的飞行安全.在简化机翼模型上添加扰流片,通过一个矩形翼以引入一个与主翼尾涡大小不同、方向相反的小涡,构建尾流自消散四涡系统,以期诱发尾涡的rAylEIgH-ludWIg相交不稳定性.通过改变扰流片的大小形状,调整模型的攻角和拖曳速度,采用粒子图像速度场仪测量系统定量研究在低雷诺数下单主翼尾涡发展特性以及双涡相互作用特性.研究表明:在未添加扰流片时,尾涡环量在45个翼展内相对于初始环量基本保持不变;在添加扰流片的情况下尾涡的环量衰减可以达到35%~55%,而未添加的基本翼型的尾涡的环量则几乎保持不变,这说明添加适当的扰流片能诱发尾涡的rAylEIgH-ludWIg相交不稳定性,加速尾涡的消散,当小涡和主涡的初始环量比为-0.489、初始距离比为0.5时,45个翼展范围内,尾涡环量衰减55.9%.本文系统性的实验结果可以为低尾流机翼的设计提供参考依据.The aircraft wake vortex is an inherent flow phenomenon due to the lift generation mechanism,which has a negative impact on the flight safety.By adding a set of specially designed spoiler,a rectangular wing was designed to generate a pair of weaker vortices,which had different sizes and opposite direction compared to main wing vortices,thereby constructing a self-destructive four-vortex wake system to induce Rayleigh-Ludwig instability.Under different experimental conditions,in terms of changing the size or shape of the spoiler,towing speed and angle of attack,the wake vortex development of the test model,that both with and without spoiler,as well as the circulation analysis,were acquired particle image velocimetry( PIV) measurements under the low Reynolds number.The study demonstrates that the decrease in circulation was 35% to55% in 45 wingspans when spoilers are introduced,whereas the counterpart of the baseline airfoil,without spoilers,is nearly kept steadily,which reveal the application possibility of Rayleigh-Ludwig instability in alleviating the wake vortex.As the initial circulation ratio equals to- 0.489 and the initial distance ratio is0.5,the circulation of the primary vortex reduce most significantly( 55.9%) in 45 wingspans.Results would provide a scheme in the design of airfoils with weaker vortices.国家自然科学基金(11072206

Environmental Behavior and Risk Assessment of Organic Phosphorus Pesticides at Water from Jiulong River Estuary

利用SPE GC FPD测定了九龙江口水体中 1 7种有机磷农药的浓度 ,总有机磷农药 (1 7种 )的含量范围是1 3 4 8～ 3 5 4 6ng/L ,平均 2 2 7 2ng/L .对其各组分的含量与行为特征进行分析表明 ,5种有机磷农药 (甲胺磷、敌敌畏、马拉硫磷、氧乐果、乐果 )在各站位均占主要部分 ,其行为受复杂的来源输入及河口的水动力影响 .对九龙江口水体中的有机磷农药的含量与其他地区进行比较 ,评价了该河口水体中有机磷农药的污染水平及风险概率Organic phosphorus pesticides (OPPs) were determined by SPE-GC-FPD. The contents of the total seventeen OPPs ranged from 134.8ng/L to 354.6ng/L (the mean was 227.2ng/L) at water in Jiulong River Estuary (JLRE). The distribution and behavior characteristics of OPPs indicated that five main OPPs (Methamidophos, Dichlorvos, Malathion, Omethoate, Dimethoate) were predominant of the total OPPs, which were affected by the complicated hydrological kinetics. When compared with other areas, the OPPs concentration level in JLRE was some moderate. But the risk evaluation of OPPs in JLRE indicated that some kinds of OPPs (Methamidophos, Dichlorvos, Omethoate) had threat to the ecological environment and human health.海洋环境科学教育部重点实验室开放基金项目(MEL0 10 4);; 中国博士后科学基金项目 ( 2 0 0 2 466

Analysis of Epistatic and QE Interaction Effects of QTLs for Grain Shape in Rice

本研究利用基于明恢86x佳辐占水稻重组自交系(rECOMbInAnT InbrEd lInE,rIl)构建的SSr遗传图谱,总标记数为131。联合两季的稻米粒长(gl)、粒宽(gW)、长宽比(l/W)表型数据,应用混合线性模型方法进行QTl定位,并作加性效应、上位效应以及加性QTl、上位性QTl与环境(QTl-by-EnVIrOnMEnT,QE)的互作效应分析。检测到粒长、粒宽和长宽比的加性效应QTlS分别为6个、4个和4个,贡献率分别为23.67%、21.41%和25.78%;检测到8对粒长的上位性QTlS,5对粒宽的上位性QTlS,2对长宽比的上位性QTlS,贡献率分别为16.75%、22.36%和7.55%;环境互作检测中,发现共有9个加性QTlS和7对上位性QTlS与环境发生了互作。结果表明,上位效应在粒形性状的遗传与加性效应一样起了重要作用,环境互作效应对粒形性状有一定的影响。A linkage map consisting of 131 markers was constructed by using a recombinant inbred line (RIL) population derived from the indica-indica rice cross Minghui86×Jiafuzhan.Quantitative trait loci (QTLs) was located with a mixed linear model (QTLmapper1.6) based on the grain shape parameters such as grain length (GL), grain width (GW) and length-width ratio (L/W), and made analysis of additive effects, epistatic, and the interaction effects of QTL-by-environment (QE).Six, four and four QTLs were detected to have significant additive effects for GL, GW and L/W, and the contribution rate were 23.67%、21.41% and 25.78%, respectively.Eight, five and two pairs of epistatic QTLs with significant additive-by-additive (AA) interaction effects were identified for three traits, and the contribution rate were 16.75%、22.36% and 7.55%, respectively.Significant QE interactions were found for nine additive QTLs and seven pairs of epistatic QTLs.The results indicated that the epistatic effects played an important role on the inheritance of grain shape, and the environmental factor had certain effects on the three traits.福建省自然科学基金项目(X0750053);厦门大学科技创新计划项目(XDKJCX20063004)共同资

Mapping QTLs for Rice Grain Shape with QTL×Environment Interactions and Epistatic Effects Analysis

利用广陆矮4号x佳辐占水稻重组自交系构建了SSr标记的遗传图谱.联合2007年和2008年获得的两组稻米粒长(gl)、粒宽(gW)、长宽比(l/W)数据应用混合线性模型方法进行QTl定位,并作加性效应、加性x加性上位互作效应以及加性QTl、上位性QTl与环境的互作效应分析.结果显示;(1)在加性效应分析中两个群体共检测到4个控制粒长的QTl,4个控制粒宽的QTl,5个控制长宽比的QTl,贡献率分别为13.81%、15.36%和16.29%.(2)在上位互作效应分析中两个群体共检测到2对控制粒长的互作QTl,1对控制粒宽的互作QTl,3对控制长宽比的互作QTl,贡献率分别为5.77%、2.59%和7.42%.(3)环境互作检测中,发现共有13个加性QTl和4对QTl的加性x加性上位性与环境产生了互作效应.结果表明,上位性效应和加性效应都影响稻米粒形遗传,QE互作效应也对粒形有着显著的影响.In this study,a recombinant inbred line (RIL) population derived from the indica-indica rice cross ‘Guangluai 4’בJiafuzhan’ was used in mapping of Quantitative trait loci (QTLs).Based on mixed linear model QTLmapper1.6,mapping was carried out for grain shape such as grain length (GL),grain width (GW) and length-width ratio (L/W) in rice in 2007 and 2008.QTLs were determined at the one-locus and two-locus levels,and QTL-by-environment (QE) interactions were analyzed.Four,four and five QTLs were detected to have significant additive effects for GL,GW and L/W,and the contribution rate were 13.81%,15.36% and 16.29%,respectively.Two,one and three pairs of epistatic QTLs with significant additive-by-additive (AA) interaction effects (epistatic effects) were identified for the three traits,and the contribution rate were 5.77%,2.59% and 7.42%,respectively.Significant QE interactions were found for thirteen QTLs with additive effects and four pairs of epistatic QTLs.The results indicated that the epistatic and additive effects played an important role on the inheritance of grain shape,and the environmental factor had significant effects on the three traits.国家863计划项目(2007AA10Z179);福建省科技计划重点项目(2008N0122);厦门大学科技创新项目(XDKJCX20063004

Characteristics of PAHs in PM_(10) aerosols collected from different districts in Xiamen

2004年冬季在厦门市4个不同功能区连续10d采集并分析了PM10中16种优控多环芳烃(PAHs).研究发现,各个功能区大气PM10中多环芳烃总浓度(ΣPAHs)存在明显差别工业区(湖里)10.87~27.54ng·m-3、旅游区(鼓浪屿)7.79~21.14ng·m-3、居民区(洪文)6.52~13·39ng·m-3、森林区(小坪)5.20~11.43ng·m-3;但各个功能区PM10中各种PAH化合物的相对组成趋于一致,所占比例最高的前4种化合物为菲、芘、和芴,表明冬季不同功能区PM10中PAHs的主要污染来源在很大程度上相似或相同.根据典型污染来源中特征化合物比值如苯并(a)蒽/、荧蒽/芘和芘/苯并(a)芘及其有机碳/元素碳的值,推断厦门市PM10中的PAHs主要来源于汽车尾气的排放. 【英文摘要】 An intensive sampling program has been undertaken in the absence of precipitation at four different sites, Xiamen, to characterize the atmospheric concentration of 16 priority polycyclic aromatic hydrocarbons in PM_ 10 aerosols during 2004 winter. There was significant difference in the average value of ΣPAHs (defined as the sum of 16 PAH compounds) during the sampling time among four sites. ΣPAHs value is as follows: Huli at 10.9~27.5 ng·m -3 , Gulangyu at 7.8~21.1 ng·m -3 , Hongwen at 6.5~13.4 ng·m -3 , a...国家自然科学基金项目(No.40476048)~

闽江口水、间隙水和沉积物中有机氯农药的含量

[摘要]：利用GC2ECD 和GC2MSD 对1999 年11 月闽江口水、间隙水和沉积物中的有机氯农药进行了研究. 结果显 示,闽江口水中有机氯农药的含量范围是01532～1182μg/ L ,间隙水中有机氯农药的含量为4154～1317μg/ L ,沉 积物(干重,以下讨论到的沉积物,无特别说明都是干重表示) :28179～52107μg/ kg ;与其他河口如珠江口、九龙江 口相比,闽江口的污染水平居中. 间隙水的污染物浓度普遍高于其上覆水的浓度,而沉积物中的浓度大于间隙水、 表层水,是由于有机污染物在水体中倾向于吸附在沉积物颗粒,并且通过再悬浮从底层向上迁移. 对水体中有机 氯农药各组分的含量及特征进行了分析,发现有机氯农药的主成分为:β2HCH ,DDE ,Heptachlor (七氯) ,Endosulfan Ⅱ(硫丹) ,Methoxychlor (甲氧滴涕) . DDE、β2HCH、Endosulfan Ⅱ分别占DDTs、HCHs 和硫丹的主要部分;有机氯 农药各组分间有正相关性,表明其河口有机氯农药陆源的土壤输入与相似的环境行为;对该河口的污染水平进行 了初步的评价,HCHs 符合国家海水水质一级标准,DDTs 则超过该标准.[Abstract]:The concentrations of 18 organochlorine pesticedes in water , pore water and surface sediment from Minjiang River Estuary were analyzed by GC2ECD , and confirmed by GC2MSD. The range of organochlorine pesticides was 01532～1182μg/ L at water , 4154～1317μg/ L at pore water , and 28179～52107μg/ kg at sediment . Compared with the results of other estuaries and gulfs (Pearl River Estuary , Jiulong River Estuary and so on) , it showed that the pollu2 tion of organochlorines in Minjiang was some moderate. The concentration difference in surface water , middle water , bottom water , pore water and sediment , due to the higher affinity of these hydrophobic compound for sedimentary phase than to water and a potential flux of pollutants from sediment to overlying water. The predominance ofβ2HCH ,DDE , Heptachlor , Endosulfan Ⅱand Methoxychlor in all water , pore water and sediment were clearly observed. On average , DDE、β2HCH、Endosulfan Ⅱoccupied the most part of total DDTs , HCHs and Endosulfans respectively , indicated the fate of these parent compounds or congeners. At the same time , it was found that thepositive relationship among the in2 dividual organochlorine components (HCHs , DDTs and Endosulfans) , which indicated that the similar of the source and behavior for organochlorine pesticides.海洋环境科学教育部重点实验室开放基金与教育 部重点基金联合资