With Multi-Fiber Arrangement (MFA) eliminated on Dec 31, 2004, the debates and concerns on the trade of textile and apparel have been growing. The objective of this study is to examine the impacts of alternative polic...With Multi-Fiber Arrangement (MFA) eliminated on Dec 31, 2004, the debates and concerns on the trade of textile and apparel have been growing. The objective of this study is to examine the impacts of alternative policies on China and World economy after canceling MFA. Based on a general equilibrium model of the Global Trade Analysis Project (GTAP), study shows that China and World will significantly benefit from further trade liberalization. However, if USA, EU and Canada converted to TBT to restrict import, the gains from eliminating MFA would be largely offset. Based on our analysis, some policy implications are discussed.展开更多
Data structure and semantics of the traditional data model cannot effectively represent the data warehouse, it is difficult to effectively support online analytical processing （referred to as OLAP）. This paper is pr...Data structure and semantics of the traditional data model cannot effectively represent the data warehouse, it is difficult to effectively support online analytical processing （referred to as OLAP）. This paper is propose a new multidimensional data model based on the partial ordering and mapping. The data model can fully express the complex data structure and semantics of data warehouse, and provide an OLAP operation as the core of the operation of algebra, support structure in levels of complex aggregation operation sequence, which can effectively support the application of OLAE The data model supports the concept of aggregation function constraint, and provides constraint mechanism of the hierarchy aggregation function.展开更多
In biological development, morphogens are locally produced and spread to other regions in organs, forming gradients that control the inter-related pattern and growth of developing organs. Mechanisms of morphogen trans...In biological development, morphogens are locally produced and spread to other regions in organs, forming gradients that control the inter-related pattern and growth of developing organs. Mechanisms of morphogen transport were built and investigated by numerical simulations in [A. D. Lander, Q. Nie and F. Y. M. Wan, Do morphogen gradients arise by diffusion？ Developmental Cell 2 （2002） 785-796]. In that paper, model C, which considers endocytosis, exocytosis and receptor synthesis and degradation, is in a one-dimensional spatial region and couples a partial differential equation with ordinary differential equations. Here, this model is promoted to an arbitrary dimension bounded region. We prove existence, uniqueness and non-negativity of a global solution for this advanced model, of its steady-state solution and linear stability of steady state by operator semigroup, the Schauder theorem and local perturbation method. Our results improve previous results for this model in a one dimension region.展开更多
基金Financial support from the National Science Foundation of China （70333001 and 70021001） is gratefully acknowledged. The paper has benefited from the advice from Prof. Frank van Tongeren in LEI and Prof. Weiming Tian in Chinese Agricultural University on technical and modeling aspects.
文摘With Multi-Fiber Arrangement (MFA) eliminated on Dec 31, 2004, the debates and concerns on the trade of textile and apparel have been growing. The objective of this study is to examine the impacts of alternative policies on China and World economy after canceling MFA. Based on a general equilibrium model of the Global Trade Analysis Project (GTAP), study shows that China and World will significantly benefit from further trade liberalization. However, if USA, EU and Canada converted to TBT to restrict import, the gains from eliminating MFA would be largely offset. Based on our analysis, some policy implications are discussed.
文摘Data structure and semantics of the traditional data model cannot effectively represent the data warehouse, it is difficult to effectively support online analytical processing （referred to as OLAP）. This paper is propose a new multidimensional data model based on the partial ordering and mapping. The data model can fully express the complex data structure and semantics of data warehouse, and provide an OLAP operation as the core of the operation of algebra, support structure in levels of complex aggregation operation sequence, which can effectively support the application of OLAE The data model supports the concept of aggregation function constraint, and provides constraint mechanism of the hierarchy aggregation function.
文摘In biological development, morphogens are locally produced and spread to other regions in organs, forming gradients that control the inter-related pattern and growth of developing organs. Mechanisms of morphogen transport were built and investigated by numerical simulations in [A. D. Lander, Q. Nie and F. Y. M. Wan, Do morphogen gradients arise by diffusion？ Developmental Cell 2 （2002） 785-796]. In that paper, model C, which considers endocytosis, exocytosis and receptor synthesis and degradation, is in a one-dimensional spatial region and couples a partial differential equation with ordinary differential equations. Here, this model is promoted to an arbitrary dimension bounded region. We prove existence, uniqueness and non-negativity of a global solution for this advanced model, of its steady-state solution and linear stability of steady state by operator semigroup, the Schauder theorem and local perturbation method. Our results improve previous results for this model in a one dimension region.
