山西洪洞大槐树移民问题研究的回顾与思考

20世纪有关山西洪洞大槐树移民问题的研究代表了传统移民史研究的取向,研究的重点主要集中在对移民的原因、经过、路线、规模、影响等问题的探讨。进入21世纪,受后现代史学理论以及社会史研究方法的启发,有学者开始摆脱传统移民史研究的取向,尝试从一些新颖的角度、带着明确的问题意识对大槐树移民问题进行研究:从关注“人口迁移”这个动态的客观过程到关注“移民”这一主体生命本身及其背后的思想、文化过程。通过研究者及其作品背后暗含的问题意识,可以对百年来洪洞大槐树移民问题的研究进行梳理和分类。从学术思想史的脉络看,洪洞大槐树移民不仅仅是一个移民问题,更是一个重要的文化现象。     

典型报道要回归受众本位

典型报道应坚持正确的理念和方法,准确把握时代脉搏,选择老百姓认可的典型;实现立体整合传播,让更多受众了解典型;深入挖掘典型内涵,还原典型人物本色;还要带着感情讲述典型故事,用真情感动百姓。从而使典型报道遵循新闻规律,坚持以人为本,回归到受众本位。     

珍稀树种迁地保存的研究

本文报道了来舟林业试验场迁地保存99种珍稀树种的成败情况,以迁存种原产地与迁存地植物区系亲疏关系为主,并结合原产地生境,分析了成败结果,认为成功的关键是,迁存与迁存地相同或相似植物区系中的珍稀树种,并选择适合的栽植地小环境。     

A Flexible Hierarchical Bayesian Modeling Technique for Risk Analysis of Major Accidents

Safety analysis of rare events with potentially catastrophic consequences is challenged by data scarcity and uncertainty. Traditional causation‐based approaches, such as fault tree and event tree (used to model rare event), suffer from a number of weaknesses. These include the static structure of the event causation, lack of event occurrence data, and need for reliable prior information. In this study, a new hierarchical Bayesian modeling based technique is proposed to overcome these drawbacks. The proposed technique can be used as a flexible technique for risk analysis of major accidents. It enables both forward and backward analysis in quantitative reasoning and the treatment of interdependence among the model parameters. Source‐to‐source variability in data sources is also taken into account through a robust probabilistic safety analysis. The applicability of the proposed technique has been demonstrated through a case study in marine and offshore industry.     

提高果树育种学实验教学效果的实践与探索

果树育种学实验是园艺专业一门必修的实验课程。传统的实验教学存在许多问题和弊端，使教学效果不理想。根据人才培养目标的需要，结合新的人才培养方案和教学计划的修订，以提高教学质量为中心，以培养学生能力和综合素质为目标，对果树育种学实验课进行了系统的改革和探索。     

Moore机表示的系统迭代设计动态CTL模型检验的不变性研究(英文)

模型检验是系统级设计中验证可信计算系统安全性性质的有效方法。动态模型检验是模型随设计过程而变化的模型检验,动态模型检验过程中遇到的最严重问题之一是模型变化所带来的重复检验代价太高。因此,寻找不变性以避免重复检验显得尤为重要。不变性是一种贯穿系列模型检验而保值为真的性质。该文构建动态模型检验的形式化框架,进而提出基于Moore机描述的流控制系统迭代设计过程的不变性理论,该系统是一种嵌入式控制系统,在可信通信中用以处理数据转换,最后展示了若干非平凡CTL性质在迭代过程中的可保持性。     

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.