基于可变精度粗糙集的规则挖掘矩阵算法

提出了一种基于可变精度粗糙集的规则挖掘矩阵算法,它是一个采用基于分类精确度的粗糙集模型进行决策规则挖掘的新方法,能有效地处理决策表的不一致性。实例结果和实际应用表明该算法是有效的,为信息系统的规则约简、获取和信息压缩提供了新的思路。     

游戏式的对话与对抗——品特戏剧谈

品特戏剧的主题是着眼于人类的生存处境,总是处在确定与不确定之间,但又无法逃避的威胁之下。他经常写一些身份和来路不明的人,场景限制在某人房间里,而事实真相总是隐匿的。他试图用这些离奇悖理的情节使人物处于异己的环境之中,彼此聋子似的各自讲些互不沟通的话题来表现人们生存的荒诞。     

改进的粒子群优化算法结合人工神经网络用于有机物毒性的QSAR研究

介绍了粒子群优化算法和Alopex-B算法的基本原理,提出了一种用Alopex-B算法改进的粒子群优化算法,并将其应用于函数优化和有机物毒性的QSAR研究。结果表明:改进型粒子群算法对复杂的测试函数搜索效率明显提高,应用于有机物毒性的QSAR研究能提高计算的精确度,降低预测误差。     

基于遗传算法的排桩支护结构优化设计

基于自然选择和自然基因机制的遗传算法是当前处理复杂非线性模型的一种新的优秀方法。为此,文章建立了悬臂式排桩这一基坑支护结构形式的数学模型,并运用改进遗传算法对设计参数进行优化调整;结合以实际工程资料为背景的支护案例进行优化。计算结果表明,设计参数既满足约束条件,又可降低工程造价,从而显示了该方法的有效性,具有一定的参考价值。     

具有最大Wiener-Hosoya指标的树

为进一步研究分子的性质,M.Randic在文[2]中首先介绍了Wiener-Hosoya指标.Wiener-Hosoya指标能够用h(T)=∑e∈E(T)(h(e) h[e])组合原理来表示,我们是去计算Wiener指标W而不是去计算Hosoya topologic指标Z.本文主要讨论对于给定的顶点数时具有最大的Wiener-Hosoya指标的树.     

某493柴油机的噪声优化

随着柴油机向高速、大功率及高效率方向发展,其噪音、振动问题将更加突出,并直接关系到发动机的使用寿命、工作效率及环境污染等问题。目前国内外已经颁布了关于内燃机噪声的限制法规,因此降低发动机的噪声振动是当今内燃机领域的重要课题;文章以某493柴油机的噪声优化为例,着重分析了噪声声源的产生和优化控制方法。     

微操作中显微视频编码时域可缩放性的实现

在微操作中，为了观测微目标的变化过程，需要进行时间域拓展形成显微图像序列．由于微目标变化缓慢，显微图像序列具有极高的时间冗余度，为了提高效率，提出了一种基于三雏小波变换的可伸缩帧映射算法，实现了显微视频在时间尺度上的快速伸缩，为微操作中可伸缩性算法的研究提供了新的解决方案．     

具有状态和控制滞后离散系统的容错保成本控制

基于T-S模糊模型,通过无记忆状态反馈研究了一类带有状态和控制滞后的不确定离散时滞系统容错保成本控制问题。应用线性矩阵不等式(LM I)给出系统存在执行器故障时,模糊闭环系统渐近稳定的充分条件,该条件保证了对所有允许的不确定性闭环系统渐近稳定,而且对于给定的二次型成本函数,能保证闭环成本不超过某个界。算例表明该方法是有效的。     

Relationship between the tropical cyclone genesis over the Northwest Pacific and the sea surface temperature anomalies

Using the tropical cyclone (TC) data derived from the Joint Typhoon Warning Center (JTWC) and the sea surface temperature data derived from the Joint Environmental Data Analysis Center (JEDAC) at the Scripps Institute of Oceanography from January 1955 to December 2000, we analyzed the relationship between the TC genesis over the Northwest Pacific (NWP) and the sea surface temperature anomalies (SSTA) over the Pacific basin. A long-term trend indicated that the highest frequency of monthly TC genesis appeared earlier and the annual genesis sum increased gradually during the last half century with some oscillations. No significant synchronous correlation was found between the NWP TC events and the SSTA over the Pacific basin, while the annual sum of TC genesis was closely related with the SSTA averaged from the first three months (January, February and March) of the year in the equatorial western and eastern Pacific and over mid-high latitudes of the North Pacific. The results implied that there are an interannual El Nio SSTA mode in the equatorial western and eastern Pacific and an interdecadal SSTA mode in the northern Pacific, which affected the TC genesis. A regression analysis between the first three-month SSTA and the annual TC sum based on two time scales was conducted. The correlation coefficient between simulated and observed TC sums reached a high value of 0.77.     

Relationship between the tropical cyclone genesis over the Northwest Pacific and the sea surface temperature anomalies

Using the tropical cyclone (TC) data derived from the Joint Typhoon Warning Center (JTWC) and the sea surface temperature data derived from the Joint Environmental Data Analysis Center (JEDAC) at the Scripps Institute of Oceanography from January 1955 to December 2000, we analyzed the relationship between the TC genesis over the Northwest Pacific (NWP) and the sea surface temperature anomalies (SSTA) over the Pacific basin. A long-term trend indicated that the highest frequency of monthly TC genesis appeared earlier and the annual genesis sum increased gradually during the last half century with some oscillations. No significant synchronous correlation was found between the NWP TC events and the SSTA over the Pacific basin, while the annual sum of TC genesis was closely related with the SSTA averaged from the first three months (January, February and March) of the year in the equatorial western and eastern Pacific and over mid-high latitudes of the North Pacific. The results implied that there are an interannual El Nio SSTA mode in the equatorial western and eastern Pacific and an interdecadal SSTA mode in the northern Pacific, which affected the TC genesis. A regression analysis between the first three-month SSTA and the annual TC sum based on two time scales was conducted. The correlation coefficient between simulated and observed TC sums reached a high value of 0.77.