Incremental Web Usage Mining Based on Active Ant Colony Clustering

To alleviate the scalability problem caused by the increasing Web using and changing users＇ interests, this paper presents a novel Web Usage Mining algorithm-Incremental Web Usage Mining algorithm based on Active Ant Colony Clustering. Firstly, an active movement strategy about direction selection and speed, different with the positive strategy employed by other Ant Colony Clustering algorithms, is proposed to construct an Active Ant Colony Clustering algorithm, which avoid the idle and ＂flying over the plane＂ moving phenomenon, effectively improve the quality and speed of clustering on large dataset. Then a mechanism of decomposing clusters based on above methods is introduced to form new clusters when users＇ interests change. Empirical studies on a real Web dataset show the active ant colony clustering algorithm has better performance than the previous algorithms, and the incremental approach based on the proposed mechanism can efficiently implement incremental Web usage mining.     

我国利益集团政策参与的制约因素及解决对策

我国正处于由传统社会向现代社会转型的关键时期，由于社会利益的分化，我国利益集团的存在和对社会政治生活的参与已是一种客观存在的事实。但由于受到各种具体情况的制约和干扰，使得我国利益集团参与政治活动受到一定的限制。因此，分析我国利益集团政策参与的制约因素，并提出解决的对策，对于促进我国民主政治的发展．建设社会主义政治文明具有重要的意义。     

大法坪砂石料场爆破总结分析

从爆破设计、爆破安全技术及预防和成本控制等3方面对龙滩水电站大法坪砂石料场高程爆破进行了分析。目的是为了优化爆破参数，满足系统生产对爆破效果和粒径级配的要求。保证爆破安全以及文明施工，同时降低成本。     

Windows登录口令安全增强平台的设计与实现

对Windows 2000／XP安全机制中的登录部分进行了研究和改进，首先分析了现有口令和生物特征匹配登录方式的优缺点，针对这些登录方式在安全性能方面存在的不足，通过对Windows提供的用户认证机制（包括GINA、认证包以及口令过滤器等模块）的研究和重构，设计出一个可以为各种登录方式提供接口的安全功能加强平台，通过调用该平台，用户每次成功登录操作系统后，Windows SAM库中的口令得到自动更换，可有效阻止口令被盗引起的重放攻击，同时规范了人员操作，增强了系统的安全性，同时，在该平台的架构设计中，将用户信息获取功能和验证功能进行剥离，使系统在应用和二次开发中具有更大的灵活性。     

"科普追求"九章

1 科普,简略地说,就是以"科"为基础,以"普"为目的的行为或活动.科普作品则是以作品形式表现的科普活动.     

马占相思苗木茎腐病的调查和病原鉴定

于2001年4～7月，对广西高峰林场总场中心苗圃和银岭分场新造林地的马占相思（Acacia mangium Willd）苗木茎腐病进行调查和病原鉴定。结果发现，茎腐病对1年生以内的马占相思扦插苗危害严重，3月份开始发病，4～6月份为盛发期，新造林地，炼苗苗床，扦插苗床的平均发病率分别为12.1%、18.3%、72.6%，平均病死率分别为10.5%、16.2%、53.5%，苗木幼嫩、有伤口、培养基质带菌，温暖潮湿等条件有利于该病的发生与曼延，病原菌为立枯丝核菌（Rhizoctonia solani Kuhn）和尖镰孢霉菌（Fusarium oxysporum Schiecht），2种菌的致病力均很强。     

Nanometer properties of oceanic polymetallic nodules and cobalt-rich crusts

An ammonia leaching process was utilized to extract Co, Ni and Cu from oceanic polymetallic nodules, whereas an acid leaching process was utilized to extract Co, Ni, Cu, Zn and Mn from cobalt-rich crusts. Both processes produced nanometer materials—ammonia leaching residue and acid leaching residue. A systematic study was conducted on the phase, composition and physicochemistry properties of these residues. The result shows that both residues contain a large amount of nanometer minerals. Ammonia l eaching residue mainly consists of rhodochrosite, with the average grain diameter of 17.9 nm; whereas the acid leaching residue mainly consists of well-developed bassanite, with the average grain deameter of 9.5 nm. The bassanite also has a microporous structure, the volume of the pore space is 1.23 × 10⁻² mL/g. Both the ammonia and acid leaching residues have a large specific surface area, and they display a strong adsorption capacity to saturate sodium chloride vapour, N₂ and SO₂. Both residues have high contents of rare earth elements, and most of these elements exist in the state of ionic adsorption. The content of σ FeO is high. The P₂O₅ enrichment is observable in acid leaching residues. The unique composition and nanometer solid properties of the leaching residues displayed their potential value and promised a bright future for their application in the field of environmental protection and materials.     

Genistein inhibits human TNF-α-induced porcine endothelial cell adhesiveness for human monocytes and natural killer cells

Cellular immune response is a major barrier to xenotransplantation. Human tumor necrosis factor-α (hTNF-α) possesses cross-species activity and directly amplifies the immune rejection via the upregulation of adhesion molecules on porcine endothelium. We investigated the role of protein tyrosine phosphorylation in the induction of expression of E-sclectin and vascular cell adhesion molecule-1 (VCAM-1), and the augmentation of adhesion of human peripheral blood monocytes (PBMo) and natural killer cells (PBNK), after rhTNF-α-stimulation of porcine aortic endothelial cells (PAEC) in vitro, rhTNF-α-increased adhesiveness of PAEC for both PBMo and PBNK was dose-dependently reduced by pretreatment of PAEC with the selective protein tyrosine kinase (PTK) inhibitor genistein. The inhibitory effect occurred at the early time of PAEC activation triggered by rhTNF-α, and was completely reversible. PTK activity assay indicated that genistein also suppressed rhTNF-α stimulated activation of protein tyrosine kinases (PTKs) in PAEC in a dose-dependent manner. Flow cytometric analysis showed that genistein inhibited the upregulation of E-selectin and VCAM-1 by rhTNF-α. These results suggest that PTKs may regulate the expression of E-selectin and VCAM-1 on PAEC and the adherence of PBMo and PBNK induced by rhTNF-α. Moreover, dietary genistein, used as an adhesion antagonist, may contribute to managing the cell-mediated rejection in the clinical application.     

Inhibiting Effects of S.acus Linnaeus Extracts on GLT-82 Tumor Cell Lines

Hailong S.acus Linnaeus was chosen as the experimental material in the experiments and changes of cell morphology, forming rate of clone and changes of division index were conducted to identify the inhibiting effects of Hailong extract on human tumor cell lines (GLT-82). Four days after medication, most of the cells changed their normal morphology of tumor cells and became round, broken and even broke into pieces. The inhibiting rates could reach 75.1% on the fourth day. The division index reduced strongly and the clone could not form or the forming rate was very low. With the extract concentration increasing and the time prolonging, the inhibiting effect increased. These results indicate that Hailong has striking anti-tumor effects and will have a perfect future in the fields of treatment and prevention of cancer.     

多用户多径环境下DOA估计算法研究

针对移动通信中多用户多径环境下的DOA估计问题，提出利用CARE算法求出各用户的空间循征矢量，进而利用基于对称阵列的改进MUSIC算法求出各用户对应多径信号DOA的联合算法，仿真结果表明：结合CARE算法，基于对称阵列的改进MUSIC算法能自动对多用户的DOA进行分组，并能对每个用户的多径相干信号进行DOA估计，不需要做平滑计算，不需要判断多径信号的个数，不增加计算量。