Multiclassification algorithm and its realization based on least square support vector machine algorithm

1.INTRODUCTION Thedatabasedmachinelearningasastatisticlearning methodplaysanimportantpartinmodernintelligent technology.Basedontheresearchofstatisticlearning theory,VapnikVNpointedouttheproblemofexpe riencedriskminimization,andpresentedthenotionof minimizingstructurerisk.Upontheabovetheory,herecomesthesupportvectormachine(SVM)algo rithm[1].Itisespeciallyaimedatfinitesamples,and wecanfinallygettheoptimalsolutionsfortheexist ed informationbutnotforthesituationoftraditional statistictheory…     

APPLICATION OF CATIONIC POLYMERIC MICROPARTICLES ON RETENTION AND DRAINAGE

1.INTRODUCTIONThe microparticles retention and drainage technologywas brought in 1980s. It brings striking effect whenused in wet-end in paper-making. The retention offines and fillings and the drainage of pulp improved alot, meanwhile, the evenness also improved. So, mi-croparticles retention and drainage system is the maindeveloping direction of retention and drainage aids on paper-making industry.All microparticles in microparticle system we use currently are inorganic anionic. It rea…     

Low temperature spark plasma sintering of TC4/HA composites

Ti6Al4V/hydroxyapatite composites(TC4/HA) have been prepared by high energy ball milling and low temperature spark plasma sintering at 600 °C, 550 °C, 500 °C and 450 °C, respectively. The sintering temperature of the composites was sharply decreased as the result of the activation and sur fi cial modi fi cation effects induced from high energy ball milling. The decomposition and reaction of hydroxyapatite was successfully avoided, which offers the composites superior biocompatibility. The hydroxyapatite in the composites was distributed in gap uniformly, and formed an ideal network structure. The lowest hardness, compressive strength and Young's modulus of the composites satisfy the requirements of human bone.     

Using the KISO's Framework to Integrate Knowledge Sources

In complicated application environment such as CIMS (Computer Integrate d Manufacture System) enterprise, it will bring great benefits to integrate dist ributed knowledge sources. But the difficulties of knowledge sharing and reuse s eriously encumbrance the implementation of knowledge integration. In this paper, we describe how a framework of knowledge-integrated system based on ontology ( KISO) can be used to support integrating distributed knowledge sources.     

应用数学的前沿

本书是第二届“应用数学前沿”国际学术会议的论文汇编，这届会议于2006年6月8～9日为庆贺著名华人数学家林家翘先生90寿辰在北京清华大学举行，与会者除中国学者外，主要来自美国、日本和意大利等国。     

深度不确定性下沿海洪水气候变化适应决策方法述评

深度不确定性下适应气候变化的稳健决策是当前决策者和科学家共同面临的难题.以往基于气候模式预估结果进行风险评估和决策规划的局限性日益凸显,模型参数、预测结果等多方面不确定性组成的深度不确定性给决策带来的风险远超一般不确定性.近年来,研究者将稳健决策理论、适应路径方法、工程选择分析等运用于气候变化适应决策研究,它们能够系统化筛选处理深度不确定性,从而更好地把握不确定性对气候变化决策的影响.本文以沿海城市洪水适应气候变化为例,综述稳健决策、适应路径、工程选择分析3种方法的特点和相互联系.稳健决策方法结合了传统控制理论与现代管理决策理论,专注于未来场景生成、适应措施的成本-效益比较、巨量场景-适应措施的比较静态筛选.适应路径方法更关注时间维度上的场景-适应措施选择,但对未来场景缺乏充分考量.工程选择分析方法基于适应路径方法框架,专注于具体工程设计,但缺乏应用经验.如何将3种决策方法综合应用,以期服务于面向多个决策目标、构建多个未来场景、组合多种应对措施的决策过程,促进科学家、政策制定者和其他利益相关者在决策中的持续有效对话的“知识共创”过程是开展深度不确定性下气候变化适应决策的新趋势.     

1,5-环辛二烯-3,7-二炔基方酸内鎓盐衍生物的电子结构和光谱的理论研究

用PM3系列方法研究了两个1，5-环辛二烯-3，7-二炔取代方酸内鎓盐分子．对它们进行了几何结构优化，并在优化构型的基础上，计算了上述两个分子的电荷密度、红外光谱、电子光谱．预测了这两个分子的发光性质．以其中一个分子为骨架设计并计算了一系列方酸内鎓盐衍生物分子的几何结构和电子光谱，讨论了取代基团对方酸内鎓盐分子发光强度和发光波长的影响．     

Effects of postweld aging on the microstructure and properties of bobbin tool friction stir-welded 6082-T6 aluminum alloy

Samples of 6082-T6 aluminum alloy were subjected to bobbin tool friction stir welding (BT-FSW), and the joints were treated by postweld natural aging (PWNA) and postweld artificial aging (PWAA). The microstructure, microhardness, and tensile properties of the aged and as-welded specimens were investigated. Transmission electron microscopy (TEM) observations revealed that a large number of Guinier-Preston (GP) zones precipitated in the form of a network on the stir zone (SZ) after PWNA for 60 d, and a large number of β" phases precipitated in the matrix for after PWAA for 6 h. As the aging time increased, the microhardness of the SZ and the thermomechanically affected zone (TMAZ) increased significantly, and the hardness of the SZ after PWAA for 6 h was close to that of the base metal (BM). With increasing PWNA time, the strength and strain increased slightly. When the PWAA time increased, the strength clearly increased, with a maximum value of 279.9 MPa after 6 h, while the strain decreased.