Research on the International Relevance of China’s Economic Policy Uncertainty

Currently facing a complex international environment, the world faces instability and uncertainty, and the world ’s economic growth momentum is inadequate. Facing environmental instability in various aspects, in order to promote sustainable economic development, governments of various countries are also implementing policies. There is a large uncertainty. Based on the economic policy uncertainty index, this article deeply studies the correlation between the uncertainty of China's economic policies and the uncertainty of economic policies of the world's important economies, and draws the following conclusions: In terms of correlation, when major historical events occur, the economic policy uncertainty index of each country has increased significantly. Secondly, in terms of targeted correlation, the economic policy uncertainty of each country is not completely independent and will be affected by other countries. Among them, the United States and China have the highest autonomy index and have the greatest impact on other countries. France and Germany have less influence on other countries and are more affected by other countries

Neural Control of Parametric Solutions for High-dimensional Evolution PDEs

We develop a novel computational framework to approximate solution operators of evolution partial differential equations (PDEs). By employing a general nonlinear reduced-order model, such as a deep neural network, to approximate the solution of a given PDE, we realize that the evolution of the model parameter is a control problem in the parameter space. Based on this observation, we propose to approximate the solution operator of the PDE by learning the control vector field in the parameter space. From any initial value, this control field can steer the parameter to generate a trajectory such that the corresponding reduced-order model solves the PDE. This allows for substantially reduced computational cost to solve the evolution PDE with arbitrary initial conditions. We also develop comprehensive error analysis for the proposed method when solving a large class of semilinear parabolic PDEs. Numerical experiments on different high-dimensional evolution PDEs with various initial conditions demonstrate the promising results of the proposed method.Comment: Accepted for publication SIAM Journal on Scientific Computing (To Appear

Self-Adaptive On Demand Geographic Routing Protocols for Mobile Ad Hoc Networks

Abstract — It has been a big challenge to develop routing protocol that can meet different application needs and optimize routing paths according to the topology change in mobile ad hoc networks. Basing their forwarding decisions only on the local topology, geographic routing protocols have drawn a lot of attentions in recent years. However, inaccurate local topology knowledge and the outdated destination position information can lead to inefficient geographic forwarding and even routing failure. Proactive local position distribution can hardly adapt to the traffic demand. It is also difficult to pre-set protocol parameters correctly to fit in different environments. We have developed two self-adaptive on-demand geographic routing schemes. The local topology is updated in a timely manner according to network dynamics and traffic demands. Our route optimization scheme adapts the routing path according to both topology changes and actual data traffic requirements. Each node can determine and adjust the protocol parameter values independently according to different network environments, data traffic conditions and node’s own requirements. Our simulation studies have shown that the proposed routing protocols are more robust and outperform the existing geographic routing protocol. Specifically, the packet delivery latency is reduced almost four times as compared to GPSR at high mobility

Asian American Poetry: Diaspora and National Identity

Este artículo analiza poemas de la diáspora asiático-americana no sólo como expresiones de exilio y desarraigo, sino lo que es más importante como un discurso que perturba narrativas esencialistas sobre el estado-nación y trastorna el espacio-tiempo unificado de la historia nacional. Como tal, los poemas asiático-americanos de la diáspora son una forma de resistencia a la asimilación, ofreciendo una forma de construir la identidad alternativa a la de la ideología nacionalista, que evoca una relación indígena con el territorio y la historia nacionales en su formulación de una identidad nacional naturalizada excluyente de cualquier diferencia, y que obliga al “otro” a ajustarse, a ser absorbido en la estructura social jerárquica sin perturbación alguna. Uso el término “diáspora” para referirme a un conjunto específico de condiciones existenciales, a una posición teórica, y a una poética que se enfrenta a la jerarquización racial y subvierte las ideologías asimilacionistas de los Estados Unidos a través de la innovación poética y lingüística.This essay reads Asian American poems of diaspora not simply as articulations of exile and displacement, but more importantly as a discourse that disturbs essentializing narratives of the nation-state, and disrupts the unified space-time of national history. As such, Asian American poems of diaspora are a form of resistance to assimilation, offering an alternative mode of identity construction to that of nationalist ideology which evokes an indigenous bond to the national territory and history in its formulation of a naturalized national identity that excludes difference, and forces the other to conform, to be absorbed into the hierarchical social structure without disturbance or perturbation. I use the term “diaspora” to refer to a particular set of existential conditions, a theoretical position, and a poetics that challenges racial hierarchy, and undermines assimilationist ideologies of the United States, through poetic and linguistic innovations