武汉市园林树木种类及分析

对武汉市现有园林树木种类进行了调查、整理、研究，并对它们的现状进行了分析，提出了武汉市园林树木造景的建议。     

Tree‐Based Logistic Regression Approach for Work Zone Casualty Risk Assessment

This study presents a tree‐based logistic regression approach to assessing work zone casualty risk, which is defined as the probability of a vehicle occupant being killed or injured in a work zone crash. First, a decision tree approach is employed to determine the tree structure and interacting factors. Based on the Michigan M‐94\I‐94\I‐94BL\I‐94BR highway work zone crash data, an optimal tree comprising four leaf nodes is first determined and the interacting factors are found to be airbag, occupant identity (i.e., driver, passenger), and gender. The data are then split into four groups according to the tree structure. Finally, the logistic regression analysis is separately conducted for each group. The results show that the proposed approach outperforms the pure decision tree model because the former has the capability of examining the marginal effects of risk factors. Compared with the pure logistic regression method, the proposed approach avoids the variable interaction effects so that it significantly improves the prediction accuracy.     

唐五代牡丹传播研究

唐至五代，牡丹在各地广泛传播，受到各个阶层的喜爱，社会由此掀起了一股喜爱牡丹的热潮。牡丹热是社会、经济、文化、技术等发展到一定程度的产物。研究唐五代牡丹的地理分布，从多个角度分析牡丹得以广泛传播的原因，有助于我们了解唐五代时的社会习俗及其文化风貌。     

通信网告警加权关联规则挖掘算法的研究

关联规则挖掘算法是通信网告警相关性分析中的重要方法。在处理数量庞大的告警数据库时,算法的效率显得至关重要,而经典的FP-growth算法会产生大量的条件模式树,加权算法MINWAL(O)则需要多次扫描数据库,使得在通信网环境下挖掘关联规则的难度非常大。该文提出了一种高效的基于加权频繁模式树的通信网告警关联规则挖掘算法,算法性能测试表明,该算法与已有的加权关联规则挖掘算法相比较,节约了大量的存储空间,提高了算法的挖掘速度,对通信网的故障诊断和故障定位有着积极的意义。     

江苏省杨树栽植户纵向协作形式选择的影响因素分析

以江苏省杨树栽植农户为例,对影响农户纵向协作形式选择的影响因素进行了实证分析。研究结果表明,户主及家庭特征和交易成本等因素影响了杨树栽植农户销售渠道的选择行为。其中,户主受教育程度、家庭中是否有读书的孩子、家庭中是否有人从事非农职业、栽植规模、能获得一个好的价格和买方声誉好等因素对农户选择合同销售有正的影响,其它则有负的影响或者影响不显著。农户选择销售渠道的主要目的是为了减少不确定性,降低交易成本。     

明代坐隐园主人和园址的研究——以新发现的汪廷讷家族家谱为基础

坐隐园是主人汪廷讷在万历二十八年(1600)建造的一座私家园林,规模宏大,景点众多。时至今日,在坐隐园园址和园主家世这两个方面的研究依然存在一些不清晰的地方,亟待后续的研究进行澄清。通过对新发现的《汪氏谱略》《颍川越荫堂汪氏家谱》《环翠堂华衮集》进行分析,得到了汪廷讷的家族成员和后代的信息。同时,证明了汪廷讷是汪仕齐的亲生儿子而不是义子,更正了长期以来学术界对汪廷讷个人身份的一个误解。同时找到了有关坐隐园位置的新证据,进一步证明了坐隐园园址位于安徽省休宁县东部的万安镇汪村(今黄山市经济开发区新潭镇陈坑村)。     

Fault and Event Tree Analyses for Process Systems Risk Analysis: Uncertainty Handling Formulations

Quantitative risk analysis (QRA) is a systematic approach for evaluating likelihood, consequences, and risk of adverse events. QRA based on event (ETA) and fault tree analyses (FTA) employs two basic assumptions. The first assumption is related to likelihood values of input events, and the second assumption is regarding interdependence among the events (for ETA) or basic events (for FTA). Traditionally, FTA and ETA both use crisp probabilities; however, to deal with uncertainties, the probability distributions of input event likelihoods are assumed. These probability distributions are often hard to come by and even if available, they are subject to incompleteness (partial ignorance) and imprecision. Furthermore, both FTA and ETA assume that events (or basic events) are independent. In practice, these two assumptions are often unrealistic. This article focuses on handling uncertainty in a QRA framework of a process system. Fuzzy set theory and evidence theory are used to describe the uncertainties in the input event likelihoods. A method based on a dependency coefficient is used to express interdependencies of events (or basic events) in ETA and FTA. To demonstrate the approach, two case studies are discussed.     

Combining Linear and Non-Linear Objectives in Spanning Tree Problems

A classical approach to multicriteria problems asks for the optimization of a suitable linear combination of the objectives. In this work we address such problems when one of the objectives is the linear function, the other is a non-linear one and we seek for a spanning tree of a given graph which optimizes the combination of the two functions. We consider both maximization and minimization problems and present the complexity status of 56 such problems, giving, whenever possible, polynomial solution algorithms.     

唐诗槐意象的文化与文学观照

唐代沿袭周代以来视槐树为三公之位的文化心理，在长安的街道与宫廷广植槐树。但是，考察唐诗发现，槐的政治意蕴已经退化，从政治符号衍变成了情感符号，并成为一个重要的文学意象。槐意象既是一个时间意象，也是一个空间意象。对于游子而言，槐暗示其与故乡的距离；对于举子而言，槐暗示考试的时间。诗人的时空体验是槐意象的文学意蕴得以建构的内在机制，游宦、赴举等新的文化是外在动因。唐诗中的槐意象传达出流寓者的漂泊情怀、举子的科场心态。