基于兰彻斯特方程的维稳军事行动军械装备维修任务量估算

维稳军事行动维修任务量估算是科学筹划维修保障资源和维修保障方案的基础。首先描述了维稳军事行动的主要任务,给出了维稳军事行动中作战力量对比分析,并研究总结了维稳军事行动战斗损伤影响因素。以此为基础,考虑作战双方武器装备水平不对等情况,突出了装备防护性等特点,建立了考虑装备的兰彻斯特方程,并给出了典型情况下的参数设置分析,由于本方法考虑了装备水平,使估算结果更具有针对性。最后给出了示例,表明本研究的可操作性。     

Using Genetic Algorithms to Estimate and Validate Bioeconomic Models: The Case of the Ibero-atlantic Sardine Fishery

Synopsis The Neo-classical approach to fisheries management is based on designing and applying bioeconomic models. Traditionally, the basic bioeconomic models have used pre-established non-linear functional forms (logistic, Cobb–Douglas) in order to try to reflect the dynamics of the renewable resources under study. This assumption might cause misspecification problems and, in consequence, a loss of predictive ability. In this work we intend to verify if there is a bias motivated by employing the said non-linear parametric perspective. For this purpose, we employ a novel non-linear and non-parametric prediction method, called Genetic Algorithms, and we compare its results with those obtained from the traditional methods.     

论现代予力砼结构设计概念的发展

简述50余年来预应力砼概念发展阶段和予力概念的形成，以及予力结构的特点和设计方法的开拓。     

建筑空间限制条件下运用空心无梁楼盖设计实例分析

如今随着我国建筑技术的不断发展成熟,空心无量楼盖设计技术已经得到了比较广泛的应用,但是在施工过程中还存在一些问题需要注意。     

Government intervention,sectoral productivity growth and structural transformation

This article examines the long-term impact of government intervention and sectoral productivity on structural transformation. We construct a multi-sector Dynamic General Equilibrium model that explicitly incorporates government intervention as a force of structural transformation. The government affects the economy through taxation and lump sum transfers. We show that in the steady state, a reduction in the tax rate and an increase in sectoral productivity will decrease the agricultural employment share, and when nonhomotheticity of preference is strong enough, these changes can also increase the share of services employment.     

Effects of the structural change on transaction costs between North America natural gas spot markets

Threshold cointegration between market pairs before and after the potential structural break associated with the shale gas revolution is examined. Pairwise transaction costs differ between the pre- and post-break periods. During the post-break period, five of seven pairwise transaction costs decrease, while the remaining two pair-wise transaction costs increase relative to the pre-break period. Alterations in natural gas flows as the result of the shale gas revolution partially explain the changes in transaction costs.     

Expanding Socio-economics in Four Dimensions

Abstract

During the last decades the rapid progress in the fields of complex modelling and simulationor in the cognitive and the life sciences was not accompanied by a similar advancement of the socio-economic research tradition itself. Socio-economics as a hybrid field for the complex dynamics of modern societies across their micro-, meso- and macro-levels has still a long way to go in order to reach its full potential. The present article provides a general outline for expanding and advancing socio-economics along four different dimensions which should be able to produce a significant take-off for socio-economic theories, models, methods and mechanisms.     

The Measurement and Structural Modeling of the Reasonableness of Workplace Accommodations

The Americans with Disabilities Act of 1990 (ADA) guarantees protection from discrimination for persons with a disability. The ADA requires employers to make reasonable accommodations for persons with physical and mental disabilities unless doing so would produce undue hardship on the organization. Fifteen years after the passage of the ADA, the question as to what is a reasonable accommodation remains controversial, especially for some types of disabilities. In this study, a reasonable accommodation scale is proposed and tested using structural equation modeling in hopes that such a scale will aid the courts and organizations in determining what is reasonable. Individuals’ level of awareness of disability issues is also examined in the model to examine the relationship between awareness and willingness to accommodate. Results indicate acceptable fit of the model to the data and provide support for the proposed scale. Furthermore, the relationship between awareness of disability issues and willingness to accommodate was significant. Implications for research and practice are discussed.     

Development of a national competitiveness index based on a structural equation model

In this paper, we propose a national competitiveness index using raw Institute of Management Development (IMD) data and try to overcome a shortcoming in the IMD's own ranking system. The IMD world competitiveness ranking considers 20 factors to define an index, but it does not consider the structural relationships among various factors. We utilise a structural equation model to derive a national competitiveness index that reflects such structural relationships. We then reveal new rankings of world competitiveness. In addition, we conducted a comparison analysis by economy level and identified improvement points in terms of measurement variables as well as latent variables. Our work is expected to promote a new era of national competitiveness rankings and indices.     

Economic liberalization and welfare in a model with an informal sector

The paper reexamines the conventional results relating to inflow of foreign capital, removal of protectionism and structural reform programmes, in a small open economy in terms of a two-sector general equilibrium model with an informal sector. The paper shows that in the presence of labour market distortion and a protectionist policy, inflow of foreign capital may be desirable irrespective of the pattern of trade of the economy due to its favourable impact on welfare. But the welfare implications of tariff reductions and/or structural adjustment programmes, such as deregulating the formal sector labour market, depend crucially on the economy's trade pattern. The paper provides an answer to the question as to whether in a developing economy labour market reform and tariff reform should go hand-in-hand or whether one should precede the other for welfare improvement.
JEL classification: F10, F13, F21, O17.