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对等网络中改进蚁群智能搜索算法研究
Intelligent Search Study Based on Improved Ant Colony Algorithm in P2P Networks
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锦旗, 郭玉龙
Hans Journal of Data Mining (HJDM) , 2014, DOI: 10.12677/HJDM.2014.43003
Abstract:
为了提高蚁群算法在P2P网络资源搜索中存在搜索盲目、搜索效率低的问题,论文将多态蚁群算法和应用到了P2P网络搜索。针对搜索一段时间后网络中发起的对新的文件请求,引入合成信息素的概念,以减少搜索初始阶段消息转发的盲目性。对无结构P2P网络中的洪泛算法、蚁群算法、引入合成信息素后的蚁群算法进行模拟实验,实验结果表明所提出的算法可有效提高P2P网络的搜索性能。
In order to enhance the practicality of ant colony algorithm and improve the search efficiency of peer-to-peer networks, this paper presents a new approach of unstructured P2P information re-trieval based on the polymorphic ant colony algorithm. In order to meet the new file requirement after a while of searching, the conception of generated pheromone is imported to decrease the blindness of pack forwarding in early searching stage. Based on the simulator framework, simu-lating the flooding, ant colony algorithm, ant colony algorithm with generated pheromone in un-structured peer-to-peer networks, and analyzing the experience data, the experience results indi-cate that the algorithm is effective and can enhance the performance of peer-to-peer networks.

Differentiation distance-based outliers detection algorithm
基于分化距离的离群点检测算法

LIU Huan,WU Jie-jun,SU Jin-qi,
刘欢
,吴介军,锦旗

计算机应用研究 , 2010,
Abstract: 为了满足大规模数据集快速离群点检测的需要,提出了一种基于分化距离的离群点检测算法,该算法综合考虑了数据对象周围的密度及数据对象间的距离等因素对离群点的影响,通过比较每一对象与其他对象的分化距离来计算其周围的友邻点密度,挖掘出数据集中隐含的离群点。实验表明,该算法能有效地识别离群点,同时能反映出数据对象在数据集中的孤立程度。算法的复杂度较低,适用于大规模数据集快速离群点检测。
溢流堰形态对水体营养盐及有机污染的影响
锦旗,王国祥
环境工程 , 2007, DOI: 10.13205/j.hjgc.200702029
Abstract: 定期监测两种不同形态的溢流堰坝体上下点的溶解氧及水质变化,研究溢流堰形态对水体营养盐及有机污染的影响。结果表明两种不同形态的溢流堰均可较好地提高水体的DO含量,且阶梯式溢流堰较斜面式溢流作用明显;高锰酸盐指数IMn、NH3-N、TP含量均减少,平均去除率阶梯式溢流堰均优于斜面式溢流堰。
溢流堰影响下溶解氧与氨氮及codmn的关系
锦旗,王国祥
人民黄河 , 2007,
Abstract: ?为研究河道水体在溢流堰影响下水中溶解氧对氨氮和高锰酸盐指数的影响,选择一城市河道溢流堰,在堰上和堰下设采集点,定期监测do、nh3-n和codmn含量的变化,并进行回归分析.结果表明:堰下do含量增加,nh3-n含量总体降低;溢流堰上、下水体中do与codmn含量大体呈负相关关系,但关系不显著;堰体上、下do增加值和codmn降低值呈明显线性关系.
View-dependent real-time rendering algorithm for large-scale terrain
一种视点相关的大规模地形快速实时生成算法

WU Hui-xin,SU Jin-qi,XUE Hui-feng,
吴慧欣
,锦旗,薛惠锋

计算机应用研究 , 2008,
Abstract: During the flyover of large-scale terrain, in order to eliminate the popping effect of switching among levels of detail and to increase the frame rates with high image quality, this paper put forward a new bottom-up modeling strategy, which con-structed simplified terrain triangle mesh globally and updated mesh nodes dynamically. Employed hybrid culling technique based on blocks and triangle faces and simplified computing method for screen-space errors to select appropriate terrain nodes rapidly. Then updated the Delaunay terrain mesh by adding nodes, deleting nodes and modifying locally. At the same time achieved self-adaptive control for screen-space error tolerance during the terrain flyover. Results of simulation experiments demonstrate that the algorithm eliminate popping effect effectively, and has a higher frame rate compared with other algo-rithms. So it is particularly suitable for close-distance flyover simulation of large-scale terrain.
3D reconstruction from section plane views based on drill hole information
基于钻孔信息的二维剖面图的三维实体重建*

LI Xian-feng,XUE Hui-feng,SU Jin-qi,
李献峰
,薛惠锋,锦旗

计算机应用研究 , 2008,
Abstract: In order to represent 3D spatial entity effectively in geological engineering, layered model for geological mass was put forward based on drill hole information. Firstly, for the given geological drill hole data, adaptive neural network was adopted to forecast ore grade of information unknown areas within the geological sections and then geological layered data was obtained. Secondly, based on discretization meshwork model, topological relations for control points could be established automatically between adjacent data layers, so as to construct surface model of 3D spatial entity, which could be visualized by OpenGL technique. Finally, a 3D simulation system had been developed and some simulation experiments were made with empirical data to analyze the validity of the modeling method.
菹草种群对湖泊水质空间分布的影响
锦旗,郑有飞,王国祥
环境科学 , 2011,
Abstract: 对南京玄武湖菹草种群内外水体进行了26 h连续理化指标监测及分析,研究菹草种群对湖泊水体的环境效应.结果表明,表层水体DO最高值11.85mg/L)、最低值(9.90mg/L)均出现在种群内,种群外水域DO含量随与种群距离增加而递减;种群内及开阔水域表层与底层DO差异较小,而种群与开阔水域交界处表层与底层DO差异较大.pH值自种群内向开阔水域递减,表层水体种群内pH最高值达10.3,种群外最低值仅9.2;种群内表层水体pH高于底层,而开阔水域无梯度差异.水体TDS含量随与种群距离增加而升高,种群外表层水体最高达216.9mg/L,种群内最低仅为177.7mg/L;表层水体TDS均低于底层.TN、NO-2-N、NO-3-N含量自种群内向开阔水域递增,种群内TN均低于2.00mg/L,种群外均高于2.00mg/L,种群内NO-2-N均低于0.026mg/L,种群外均高于0.026mg/L,种群内NO-3-N均低于1.25mg/L,种群外大部分高于1.25mg/L,表层水体TN、NO-2-N、NO-3-N低于底层,但差异均不显著(p>0.05);NH+4-N含量种群内外及垂直差异均无明显规律性.表层水体TP、PO3-4-P含量种群内低于种群外,种群外表层TP、PO3-4-P最高点较种群内最低点分别高出90.9%、 69.64%,种群内底层水体TP、PO3-4-P含量显著高于表层,种群外表层与底层水体TP、PO3-4-P含量垂直差异不显著.菹草种群对湖泊水体水质起到一定改善作用.
紫外辐射对菹草(Potamogetoncrispus)成株快速光响应曲线的影响
锦旗,宋玉芝,薛艳
湖泊科学 , 2015, DOI: 10.18307/2015.0312
Abstract: 将菹草(Potamogetoncrispus)成株置于50、100、150、200μW/cm2剂量的UV-B辐射下,利用调制叶绿素荧光仪测定紫外辐射对菹草成株PSⅡ系统的损伤程度.结果表明:急性辐射初期叶片最大光合速率、耐强光能力、叶片捕光能力均随辐射剂量增大而减少;16d后,UV-B辐射剂量小于100μW/cm2的实验组,辐射促进其叶片光能利用效率、最大光合速率、耐强光能力,而高于100μW/cm2的实验组,随辐射时间延长,其抑制作用持续,最终高于100μW/cm2剂量组植株均死亡,而低于100μW/cm2剂量组差异不大.结果表明辐射剂量小于100μW/cm2时,UV-B辐射对叶片最大光合速率、耐强光能力、叶片捕光能力的影响较小,而高于100μW/cm2时,UV-B辐射对植株叶片PSⅡ系统构成的损伤,降低了植株叶片的光合作用能力.春末夏初陆上紫外辐射逐渐增加,对菹草伤害程度加剧,因此,紫外辐射可能是促进菹草春末夏初大批衰亡的重要原因.
uv-b辐射对菹草成株叶绿素荧光参数的影响
锦旗,**,郑有飞,薛艳
生态学杂志 , 2015,
Abstract: ?以春末夏初南京地表实际uvb剂量为参考,将菹草成株分别置于50、100、150和200μw·cm-2剂量的uv-b辐射下,测定其叶绿素荧光参数。结果表明:fo、fm在辐射早期随辐射剂量增加而递增,但后期随辐射剂量增加而递减;fv/fm、φpsii、npq随辐射剂量增加而递减。因此,菹草成株在遭遇uv-b辐射后,psii反应中心出现可逆性失活或出现不易逆转的破坏,致使原初光能转换效率、电子传递速率下降,实际光化学效率降低,最终加速菹草衰亡。因此,春末夏初uv-b辐射增强可能是促进野外菹草大批衰亡的重要原因,但是否与其他环境因素之间存在联合作用机制,还需要进一步研究。
不同流速下溢流堰对河道水质的影响
锦旗,王国祥,郑建伟
人民黄河 , 2014,
Abstract: ?通过对不同流速条件下水体经过45°阶梯式溢流堰坝体后水体营养盐及有机污染物指标的定期监测和分析,探讨阶梯式溢流堰在何种水动力条件下对水体的改善作用最大。结果表明:水体经过溢流堰曝气作用后,不同流速条件下其复氧程度不同,中流速(125.00cm/s)条件下效果最佳,do增加率最大;水体经过45°阶梯式溢流堰曝气作用后,imn、nh3-n、tn、tp含量均降低,其中imn、nh3n、tn在中流速条件下去除效果最佳,而tp去除率在低流速条件下最大;由于溢流堰距离较短,因此部分水质指标改善效果不显著。
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