自由软件开发的模块化理论解释与启示

本文以GNU/Linux为例讨论了源代码的内部结构在自由软件开发中所起的重要作用。为此,我们考虑了源代码的模块化属性。源代码的模块化将直接影响开发者是否参与对自由软件的开发。基于模块化的自由软件开发不仅实现了劳动的分工,同时也实现了劳动价值的分割,在自由软件的开发过程中较好地解决了搭便车问题。同时,模块化理论对我国发展软件产业也有一定的借鉴作用。     

纳税评估:演绎税源管理的精彩

江西省国税系统开发并推广应用的<江西省国税局纳税评估管理信息系统>得到国家税务总局的肯定.目前在江西全省11个设区市共115个县市区及直属局全部上线正式运行,全省8952户增值税一般纳税人、5921户查账征收的增值税小规模纳税人和企业所得税纳税人全部纳入评估范围.     

峰谷分时电价的现状分析与发展趋势探讨

分时电价以经济学均衡价格为理论依据。它在引导客户合理用电、削峰填谷、优化电力资源配置等方面起了积极的作用。但它也存在分时价差幅度小、时段划分长、缺乏灵活性及实施范围窄等问题。完善分时电价运行机制,由分时电价向实时电价转变。     

金融不良资产评估走向规范化

近几年来,随着金融体制改革和金融不良资产处置工作的推进,金融不良资产评估业务在我国得到了长足的发展.资产评估行业和四大资产管理公司在金融不良资产评估理论和实践方面进行了深入探索,总结了不少成功的经验,为金融不良资产的处置发挥了重要作用.     

外国会计师事务所在美国PCAOB注册的情况

根据美国上市公司会计监督委员会(PCAOB)公布的信息,截止到2005年1月27日,已有1433家会计师事务所在PCAOB注册,其中,400多家为来自美国以外的76个国家和地区的外国会计师事务所,包括15家中国内地的会计师事务所在内。PCAOB的注册依据和规则美国根据2002年《萨班斯—奥克斯利法案》的规定,设立了独立的非政府监管机构——公众公司会计监督委员会(PCAOB),会计师事务所只有在PCAOB注册登记后,才可以参与对美国上市公司的审计业务。由此,该法案的规范对象涉及了与美国上市公司审计业务相关的外国会计师事务所,即任何为美国上市公司提…     

广甘高速公路边坡安全监测实践与思考

本文结合四川广甘高速公路边坡安全监测实践,对边坡安全监测技术的发展过程与前景进行了认真的思考与分析。     

Likelihood evaluation of models with occasionally binding constraints

Applied researchers interested in estimating key parameters of dynamic stochastic general equilibrium models face an array of choices regarding numerical solution and estimation methods. We focus on the likelihood evaluation of models with occasionally binding constraints. We document how solution approximation errors and likelihood misspecification, related to the treatment of measurement errors, can interact and compound each other.     

The capital market spillover effect of product market advertising: Evidence from stock price synchronicity

We analyze whether product market advertising has a spillover effect on stock price synchronicity by transmitting firm-specific information to the capital market and attracting more investor attention. Using a sample of Chinese listed firms from 2009 to 2017, we find that firms with greater advertising expenditures have lower stock price synchronicity. The results are robust after we address endogeneity concerns. In accord with our hypothesis that product market advertising increases the amount of firm-level information capitalized into stock prices through the information channel, we find that the impact of advertising on synchronicity is more pronounced for firms with a higher degree of information asymmetry and firms in the consumer-product industry. Further tests show that product market advertising enhances the ability of current period returns to reflect future earnings, and thus rules out that the negative relationship between advertising and synchronicity is driven by noise trading. Our results imply that product market advertising plays an informative role and improves information efficiency in a capital market.     

塔里木油田哈得区块标准井及标准井标准工艺流程的构建

为缩短钻井周期、节约钻井成本,塔北项目部率先提出了以标准井及标准工艺流程为经度,以标准化设计、标准化安全管理、标准化工期及费用、标准化质量控制及考核机制为纬度的"五标"管理理念,而标准井及标准工艺流程为构建"五标"管理理念的关键。根据对哈得区块已完钻的直井、水平井、侧钻井、定向井的统计分析,并结合实际生产开发情况,确定了以直井和水平井作为哈得区块标准井的井型;根据标准井产层的各项地层参数,确定了相应标准井的钻头尺寸组合、钻进深度、套管规格、套管下深、泥浆体系、测井等参数,从而构建了哈得区块直井和水平井2种井型的标准井;同时依据各标准井构建了相应标准井的标准工艺流程。通过塔北项目部的生产实践表明,标准井及标准井的标准工艺流程的构建大大有助于提高油田的经济效益和管理效率。     

Immigrants’ net direct fiscal contribution: How does it change over their lifetime?

Life-cycle direct public fiscal contributions and transfers are studied using longitudinal income tax data from 1982 to 2016 and administrative files for immigrants landed in Canada from 1980 to 2016. Relative to a comparison group comprising the Canadian-born and immigrants landed before 1980, immigrants since 1980 have a lower average net direct fiscal contribution (NDFC) during their working years due to their lower taxes and social security contributions but a higher average NDFC after 65 years of age because of reduced public pension eligibility and entitlement. Immigrants who landed at younger than 19 years old have much higher direct fiscal contributions than other age-at-arrival groups and reach their peak of contributions around 10 years earlier in life than other age-at-arrival groups. Immigrants whose age at arrival is above 65 have a less negative average NDFC than other age-at-arrival groups over the above-65 life cycle. These life-cycle age𠄁at-arrival trajectories are stable for immigrants in different landing cohorts. We apply the life-cycle estimates to project the present discounted value of lifetime NDFCs for immigrants who landed in 2016. For each landing age group, refugees and family class immigrants have negative or zero average present values of life-cycle NDFCs, much below that of economic immigrants.