文学生态学批评之“问题意识”刍议——从鲁枢元教授生态学批评观谈起

文学生态学批评的发生有着深刻的“问题意识”背景，而该批评中“问题意识”的凸现又要求着“主题意识”方面的建构与“命题意识”方面的探究，总起来看，该批评意味着一种关于人的认识新范型——“生态人”的出现与一种文学观方面的新理解。     

Comparison of causal effect estimators under exposure misclassification

Over the past decades, various principles for causal effect estimation have been proposed, all differing in terms of how they adjust for measured confounders: either via traditional regression adjustment, by adjusting for the expected exposure given those confounders (e.g., the propensity score), or by inversely weighting each subject's data by the likelihood of the observed exposure, given those confounders. When the exposure is measured with error, this raises the question whether these different estimation strategies might be differently affected and whether one of them is to be preferred for that reason. In this article, we investigate this by comparing inverse probability of treatment weighted (IPTW) estimators and doubly robust estimators for the exposure effect in linear marginal structural mean models (MSM) with G-estimators, propensity score (PS) adjusted estimators and ordinary least squares (OLS) estimators for the exposure effect in linear regression models. We find analytically that these estimators are equally affected when exposure misclassification is independent of the confounders, but not otherwise. Simulation studies reveal similar results for time-varying exposures and when the model of interest includes a logistic link.     

Fast and Stable Algorithms for Computing and Sampling From the Noncentral Hypergeometric Distribution

Although the noncentral hypergeometric distribution underlies conditional inference for 2 × 2 tables, major statistical packages lack support for this distribution. This article introduces fast and stable algorithms for computing the noncentral hypergeometric distribution and for sampling from it. The algorithms avoid the expensive and explosive combinatorial numbers by using a recursive relation. The algorithms also take advantage of the sharp concentration of the distribution around its mode to save computing time. A modified inverse method substantially reduces the number of searches in generating a random deviate. The algorithms are implemented in a Java class, Hypergeometric, available on the World Wide Web.     

分支蚁群动态扰动算法求解TSP问题

蚁群优化算法是一种求解组合优化难题的强启发式算法,它利用正反馈和并行计算原理,具备很强的搜索能力。近年来,蚁群优化算法广泛应用于TSP问题的研究。本文提出分支蚁群动态扰动(DPBAC)算法,该算法主要从5个方面对基本蚁群算法做出改进:引入分支策略选取出发城市;改进状态转移规则;引入变异策略改进蚂蚁路径;改进信息素更新规则;引入条件动态扰动策略。实验表明,该算法可以有效改善基本蚁群算法搜索时间较长、容易陷入局部极小等缺点。     

Measuring the Prevalence of Sector-Specific Problem Gambling: A Study of Casino Patrons

This study is the first attempt to measure the prevalence of problem gambling attributable to a specific sector of the gambling industry. One thousand, one hundred and five casino patrons in 40 casinos in the UK were interviewed, face-to-face. Respondents were screened for problem gambling using a multiple response version of DSM-IV (DSM-IV-MR). The study found support for Eadington's (1988) hypothesis, that UK casinos could be largely sustained by regular players, among whom the prevalence of problem gambling is high. The study also found support for the hypothesis that, to the extent different gambling sectors are patronised by demographically different client groups, so the problem gamblers associated with them will reflect these client groups. The problem gamblers among the regular casino patrons were demographically distinct from the problem gamblers in the sample who showed a preference for other gambling forms. Other key findings support those found in other jurisdictions. Sector-specific prevalence studies may be the next step forward in epidemiological research on problem gambling. They have the major advantage of netting significantly more problem gamblers from much smaller samples than similar studies in the general population. They also have the potential to reveal the proportion of problem gamblers attributable to each sector, along with their demographic characteristics. Such information would result in more specific information being available for regulators seeking to minimise the social impact of problem gambling and those involved in the development of prevention and treatment strategies.     

浅议经营者实行股票期权存在的问题

股票期权作为一种对经营者新的激励机制在我国取得了一定的发展,但还存在一些问题,主要表现在:法律法规方面、法人治理结构方面、有效市场方面、技术方面、思想观念方面等,只有解决这些问题,股票期权才能在我国顺利发展.     

对中国古代科学中有争议的几个问题的认识

文章认为中国古代科学虽有其弱点,但不能由此否定中国古代科学之成就,不能套用近代科学的标准去评判中国古代科学成就,由此批评了中国古代无科学的观点以及修改“李约瑟难题”的论点。     

上海青少年社会工作者专业能力建设的行动研究

本文是上海X区青少年社会工作站的社会工作者专业能力建设的行动研究的初步成果。全文从研究背景、研究方法、研究历程、初步成效、反思等方面对行动研究项目作了介绍。在总结了社会工作者专业能力建设的行动研究四阶段特征的基础上,本文提出社会工作者专业能力的建设必须与社会工作知识观、社会工作服务内容与形式的创新,以及社会工作专业管理机制的不断改善直接相关。     

十一届三中全会党认识和处理历史问题条件探微

本文主要论述了十一届三中全会党认识和处理历史问题的主、客条件,即十一届三中全会党能正确地认识和处理历史问题,是承继了党的传统,是历史发展的要求,是时代发展的要求,是党的战略发展的要求,是老一辈无产阶级革命家艰辛努力的结果。     

鸦片战争定海之战几个问题的商榷

18 40年 7月 ,中英鸦片战争爆发 ,首战舟山。定海总兵张朝发殉国 ,舟山被占 ,次年 2月收复。 1841年 9月 2 6日起 ,英军再攻舟山 ,相持六昼夜 ,葛云飞、王锡朋、郑国鸿三总兵率部奋战 ,同日壮烈牺牲。这是鸦片战争中中国军民英勇抵抗英军最激烈的战役之一。舟山两次沦陷 ,时达五年多 ,当地军民的反英斗争 ,在鸦片战争史上占有突出地位。但在地方史的研究与宣传教育工作方面 ,存在一些问题。如双方兵力与伤亡情况 ,及其在同整个战争诸役相比较中所居的地位等问题 ,本文根据可靠史料与数据 ,提供商讨