网络游戏成瘾量表研究——事件相关脑电位辅助分析

在我国网络游戏产业发展迅猛,网民数量持续高速增长,但同时也出现了网游玩家沉迷于网络游戏中而产生心理依赖的成瘾症状.目前对网络成瘾的概念、界定指标和测量工具都存在较大争议,缺乏网络成瘾界定的系统研究.本研究在以往多种量表的基础上,采用事件相关脑电位方法,采用成瘾Stroop实验范式,找到了可以区分网络游戏成瘾者和正常网络使用者的客观电生理指标,验证了这个分类.通过对这群已经被验证了的两组被试的问卷测量,形成了"网络游戏成瘾量表",并依据测量结果,给出了推断被试是否成瘾的总分分界值.然后,采用重测信度方法,验证了量表的稳定性和可靠性.最后,用测量预留的成瘾被试,验证了"网络游戏成瘾量表"的有效性.     

我国大学生网络成瘾研究综述

本文将通过文献资料等研究方法对我国大学生网络成瘾的研究状况进行分析,主要从大学生网络成瘾的概念、形成原因、控制网络成瘾的对策等角度介绍该项研究在我国的进展情况,进而对大学生网络成瘾这一社会现象提供有益的研究视角.     

中国发展面临六大挑战

中国科学院可持续发展战略研究组长、首席科学家牛文元9月5日在北京召开的"21世纪论坛"2005年会议上指出,21世纪中国的发展不可避免地要遭受人口、能源、自然资源及生态环境等六大基本挑战.     

我国大学生网络成瘾研究综述

本文将通过文献资料等研究方法对我国大学生网络成瘾的研究状况进行分析,主要从大学生网络成瘾的概念、形成原因、控制网络成瘾的对策等角度介绍该项研究在我国的进展情况,进而对大学生网络成瘾这一社会现象提供有益的研究视角。     

应用团体心理辅导干预大学生网络成瘾

随着互联网的发展,大学生已经成为网民的主体,大学生网络成瘾问题已经成为了一个严重的社会问题。本文介绍了网络成瘾的内涵、危害及原因,提出了团体心理治疗是戒除网络成瘾的一个行之有效的干预方法。     

2006,中国向商业贿赂开刀

从前年的"朗讯风波",到去年的"张恩照事件"和德普"回扣门"事件,数家跨国公司因在中国行贿,频频受到美国"海外反腐败法"的制裁.有数据显示,跨国公司在华行贿的事件近10年来一直呈上升趋势,中国在过去的10年中至少调查了50万件腐败案件,其中64%与国际贸易和外商有关,目前所暴露的商业贿赂案件,只是冰山一角.据2005年12月26日人民日报报道:国家工商行政管理总局公平交易局有关负责人介绍,2000年至2005年上半年,全国各级工商行政管理机关查处各类商业贿赂案件13606件,案值达52.8亿元,罚没款约8.1亿元.     

医学院校学生网瘾问题及相关对策的分析探讨

随着信息时代的来临，人们对网络的使用度也在逐渐增强。但对网络的过度依赖造成了一定程度的网络成瘾显现，在高等院校中尤其严重。目前，网络成瘾问题已经影响到校内的正常教学秩序和学生的心理、生理损害。本文以高等院校学生网络成瘾问题为研究对象，以辅导员的身份对齐齐哈尔医学院基础医学院学生进行了具有针对性的调查，通过调查结果分析了大学生网瘾问题的成因，并提出了相应的解决对策及建议。     

什么样的城市是最好的城市--2005年中国城市论坛北京峰会凸现新理念新亮点

由北京朝阳国际商务节组委会和中国城市论坛组委会联合主办的"2005年中国城市论坛北京峰会"于9月13-15日在北京国际会议中心举办.本次论坛以"创新城市管理,创造城市价值"为主题,深度聚焦中国城市发展战略和城市管理领域的重大理论和实际问题,从而使今年的论坛理念领先、亮点纷呈.     

防控网上银行操作风险

随着网上银行在我国的发展,网上银行交易额2005年达到72.6万亿元,企业用户74万户,个人用户也达到了3460万户.在网上银行迅速发展的同时,交易安全问题也日趋突出,工商银行、农业银行等网站都曾被假冒,一些网上银行用户的资金被盗.来自国际反网络诈骗组织的报告显示,我国已成为世界第二大拥有仿冒域名和网站的国家,"网银大盗"已成为我国网上银行的头号威胁.     

成瘾人格与大学生网络成瘾的预防

成瘾的易感因素和维持因素是一个复杂的因果网络系统,关于成瘾心理原因的研究中强化理论和成瘾人格是重要的研究主题。临床研究正逐渐揭示一种明显的人格类型,即愤怒的、冲动性的、社交异常的个体易于成瘾。大学生网络成瘾的现象已经引起社会的广泛关注,本文对成瘾人格这一概念及其相关研究进行了回顾,综合论述了该领域的研究成果及进展,最后呼吁高校教育工作者关注那些可能存在成瘾倾向性人格的大学生,并且总结了一系列可以有效避免大学生网络成瘾的措施。     

移动互联大爆炸 最具市场潜力的20种酷模式

这是大企业的舞台,也是小公司的竞技场,国内外无数创业者涌入,同在一个起跑线上;这里没有门神,几人小团队很可能打败实力雄厚的大公司,这不再是以前的互联网,它是更具颠覆性的移动互联网!只是,看谁能活到最后。     

基于理性依赖理论的吸烟与居民医疗保健支出研究

根据Becker-Murphy(1988)和Chaloupka(1991)理性依赖行为理论推导的医疗保健支出模型表明,卷烟消费及其依赖性对居民医疗保健支出具有重要影响.采用1997～2002年相关数据进行的实证分析显示,卷烟消费及其依赖性与居民医疗保健支出正相关,且后者的影响更大更为显著.提高目前偏低的卷烟税率既能弥补吸烟的负外部性,也能有效地促进公共健康.     

战略维度间的匹配关系与企业战略定位选择——基于战略群组理论视角

基于战略群组理论视角,分析了企业战略定位中不同战略维度的匹配问题。以境内外交易所上市的中国互联网企业为样本,选取移动互联业务比重和IT投入强度这两个关键战略维度,采用面板数据回归模型检验了研究假设。研究发现,当企业的移动互联业务比重和IT投入强度同时处于较高水平时,这一战略组合能为企业带来高绩效,是一种合理的战略位置;另一合理的战略位置则是较低的移动互联业务比重配以较低的IT投入强度,它也明显好于一者较高、另一者较低的战略组合。以上结果表明,战略定位的关键是实现不同战略维度决策之间的合理匹配,从战略组合的角度理解行业中的战略位置。研究结论不仅有助于理解移动互联市场的竞争战略与绩效,也验证了战略群组理论在战略定位研究中的重要意义,对战略组合的分析不可简化为对各战略维度的单独分析。     

Intake Fraction Variability Between Air Pollution Emission Sources Inside an Urban Area

The cost‐effective mitigation of adverse health effects caused by air pollution requires information on the contribution of different emission sources to exposure. In urban areas the exposure potential of different sources may vary significantly depending on emission height, population density, and other factors. In this study, we quantified this intraurban variability by predicting intake fraction (iF) for 3,066 emission sources in Warsaw, Poland. iF describes the fraction of the pollutant that is inhaled by people in the study area. We considered the following seven pollutants: particulate matter (PM), nitrogen oxides (NO_x), sulfur dioxide (SO₂), benzo[a] pyrene (BaP), nickel (Ni), cadmium (Cd), and lead (Pb). Emissions for these pollutants were grouped into four emission source categories (Mobile, Area, High Point, and Other Point sources). The dispersion of the pollutants was predicted with the CALPUFF dispersion model using the year 2005 emission rate data and meteorological records. The resulting annual average concentrations were combined with population data to predict the contribution of each individual source to population exposure. The iFs for different pollutant‐source category combinations varied between 51 per million (PM from Mobile sources) and 0.013 per million (sulfate PM from High Point sources). The intraurban iF variability for Mobile sources primary PM emission was from 4 per million to 100 per million with the emission‐weighted iF of 44 per million. These results propose that exposure due to intraurban air pollution emissions could be decreased more effectively by specifically targeting sources with high exposure potency rather than all sources.     

顾客采用网络银行的影响因素研究

网络银行已经成为银行业保留老顾客和获取新顾客的一种新兴的服务渠道,而有关顾客采用网络银行影响因素的研究也越来越激发兴趣,引起关注。感知风险和信任是网络银行顾客最为担心的因素,但这似乎并没有引起学者们的足够重视。大多数研究都将顾客方面的建构作为认知建构的前置因素,而将银行方面的建构作为认知建构的前置因素的研究还几乎无人问津。本研究的重要意义在于:在具体的网络银行环境下,以科技接受模型为基础,在认知建构中增加感知风险和信任等变量,同时将顾客方面的自我效能和银行方面的便利条件两个建构分别作为认知构建的前置因素,从而对网络银行的采用意图进行理论探讨和实证检验。     

基于分位数Granger因果的网络情绪与股市收益关系研究

 行为金融学理论认为，股票市场的价格变动除受宏观基本因素影响外，还在很大程度上受众多个体投资者或噪音交易者行为左右。中国股票市场拥有庞大的个人投资者群体，且股民群体与网民群体之间具有高度耦合性，使用网络情绪等信息能够探索中国股市收益变动基本规律。        为揭示个体投资者行为对股市收益的影响，以个体投资者情绪为视角，以网络环境中个体投资者的情绪信息为切入点，检验投资者情绪与股市收益的关联关系，评估网络情绪信息价值。使用中文文本情感分析方法，从新浪微博文本中提取出网络情绪时间序列；分别运用均值Granger因果和分位数Granger因果检验方法，探讨网络情绪波动与股市收益之间是否存在因果关系；将股票市场发展阶段进行细致划分，研究不同市场阶段下网络情绪波动与股市收益之间的因果关系。        对沪深300指数收益进行实证研究，结果表明，尽管在均值框架下网络情绪波动与股市收益之间因果关系并不明显，但基于分位数Granger因果分析却发现两者在极端分位点区间处存在广泛且显著的因果关系。数据显示，在40个因果关系检验中，分位数Granger因果检验的因果关系发现了23个显著的因果关系，发现率为57.5%，远高于均值Granger因果检验的7.5%。此外，股市收益受到网络情绪波动影响的程度和方式在不同市场阶段下有所不同。        研究结果具有一定的理论意义和应用价值。在一些特定分位点区间网络情绪波动对股市收益存在显著因果关系影响，这为在特定条件下股市收益的可预测性提供了佐证。网络情绪能够预测股市收益的尾部(上尾或下尾)行为特征，可以为金融风险防范提供决策参考。研究结果为股票市场的定价、收益预测和波动率估计等相关研究提供了新的研究思路，也为网络情绪信息使用提供了新的方向。     

Digitalisierung und Konvergenz von Online- und Offline-Welt

The increasing diffusion of mobile phones with internet access (Smartphones) enables more and more consumers to use the mobile internet. In addition, there is a continuing integration of location-based services (LBS). By means of Global Positioning Systems or WiFi-triangulation LBS provide context-aware information to consumers. This leads to a convergence of online and offline worlds. The usage of LBS delivers additional information to consumers (e.g. alternative offers or detailed product information). Therefore LBS do have an influence on consumer behavior. Particularly during the search process, information about prices or geographic distances, that are relevant for the purchase, are of importance. This study analyzes the relevance of location-based internet search empirically. Search costs are estimated on an individual level in a choice-based conjoint analysis using two different products. As a result, location-based internet search is considered to be very relevant for search and influential on consumer behavior. The study shows different consumers preferences and different search costs depending on the product. To conclude the study, the implications are discussed. The major contribution of this study is that it shows that offline and online search do have a mutual impact on each other. Furthermore, search costs are measured in a mobile context.     

An Analysis of Damage to U.S. Soybean Yields from 1982 Acid Deposition Levels

Experimental data were compiled for seven soybean varieties studied at four different locations in the U.S. for a period of one to three years. Three dose–response functions (linear, quadratic, and Weibull) were fitted, as appropriate, to the experimental data. Effects of acid deposition on soybean yields were estimated by combining variety-specific dose–response and production data. These calculations suggest that U.S. soybean production (2.2 billion bushels in 1982) would increase by 3.2 million bushels with a 10% reduction in 1982 hydrogen ion concentration levels in all counties where soybeans were grown, and by almost 70 million bushels with uniform improvement to pH 5.2. These estimates are based on many simplifying assumptions and are subject to several important sources of uncertainty explored in this study. The calculated changes are small in comparison with effects from other natural and anthropogenic stresses.     

Risk-Based Environmental Remediation: Bayesian Monte Carlo Analysis and the Expected Value of Sample Information

A methodology that simulates outcomes from future data collection programs, utilizes Bayesian Monte Carlo analysis to predict the resulting reduction in uncertainty in an environmental fate-and-transport model, and estimates the expected value of this reduction in uncertainty to a risk-based environmental remediation decision is illustrated considering polychlorinated biphenyl (PCB) sediment contamination and uptake by winter flounder in New Bedford Harbor, MA. The expected value of sample information (EVSI), the difference between the expected loss of the optimal decision based on the prior uncertainty analysis and the expected loss of the optimal decision from an updated information state, is calculated for several sampling plan. For the illustrative application we have posed, the EVSI for a sampling plan of two data points is $9.4 million, for five data points is $10.4 million, and for ten data points is $11.5 million. The EVSI for sampling plans involving larger numbers of data points is bounded by the expected value of perfect information, $15.6 million. A sensitivity analysis is conducted to examine the effect of selected model structure and parametric assumptions on the optimal decision and the EVSI. The optimal decision (total area to be dredged) is sensitive to the assumption of linearity between PCB sediment concentration and flounder PCB body burden and to the assumed relationship between area dredged and the harbor-wide average sediment PCB concentration; these assumptions also have a moderate impact on the computed EVSI. The EVSI is most sensitive to the unit cost of remediation and rather insensitive to the penalty cost associated with under-remediation.     

THE IMPACT OF INCOME SHOCKS ON HEALTH: EVIDENCE FROM COHORT DATA

We study the effect of permanent income innovations on health for a prime‐aged population. Using information on more than half a million individuals sampled over a 25‐year period in three different cross‐sectional surveys we aggregate data by date‐of‐birth cohort to construct a “synthetic cohort” data set with details of income, expenditure, socio‐demographic factors, health outcomes, and selected risk factors. We then exploit structural and arguably exogenous changes in cohort incomes over the 1980s and 1990s to uncover causal effects of permanent income shocks on health. We find that such income innovations have little effect on a wide range of health measures, but do lead to increases in mortality and risky health behaviour. (JEL: I10, D31)