Research on formation mechanism of coupled disaster risk
This paper systematically introduces the basic theory of coupled disaster risk.Definition of coupled disaster risk was first given,then,based on disaster system theory and disaster risk assessment theory,the classification of coupled disaster risk was discussed,and the coupled effects were analyzed from three perspectives of the correlation,forces' composition and risk matrix.Then,formation mechanism of the coupled disaster risk was discussed by triggers in physics,and the coupled effects and formation mechanism were illustrated,respectively.The complete basic theory on coupled disaster risk not only lays the theoretical foundation for the further study of coupled risk assessment,but also provides the countermeasures and suggestions for disaster prevention and mitigation,i.e.,strong coupled effects should be turned into zero coupled effects or weak coupled effects through fundamental removing or weakening the conditions of coupled risk.
This paper presents a simple general equilibrium model in which unemployed workers search for jobs and vacant firms search for employees. Formally, the author develops a two-sector, constrained efficient version of the Diamond-Mortensen-Pissarides matching model of trade coordination. This approach to modeling factor market search appears promising since its algebraic development parallels Ronald W. Jones's treatment of the two-sector model of production, and the latter framework underlies most applied general equilibrium analyses. Some illustrative short-run and steady-state results are presented concerning the behavior of open and closed economies that exhibit unemployment and vacancies. Copyright 1990 by University of Chicago Press.