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Global attractivity of positive periodic solution for a predator-prey model with modified Leslie-Gower Holling-type II schemes and a deviating argument

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international Journal of Biomathematics 2014年第6期7卷 209-221页

作者： Kai Wang Yanling Zhu Department of Applied MathematicsAnhui University of Finance and economics Bengbu 233030 P. R. China School of international trade and economicsUniversity of international Business and economics Beijing 100029 P. R. China

In this paper, by utilizing the comparison theorem and constructing a suitable Lyapunov functional the predator prey model with modified Leslie-Gower Holling-type II schemes and a deviating argument is studied. Some sufficient conditions are obtained for uniform persistence and global attraztivity of positive periodic solutions for this model. Furthermore, an example shows that the obtained criteria are easily verifiable.

关键词： Holling-type II schemes positive periodic solution uniform persistence Lyapunov functional.

Governance of noncommunicable diseases in Afghanistan

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Chronic Diseases and Translational Medicine 2024年第3期10卷 238-246页

作者： Narges Neyazi Ali M.Mosadeghrad Maryam Tajvar Najibullah Safi international Campus School of Public HealthTehran University of Medical SciencesTehranIran Department of Health System Development World Health OrganizationAfghanistan Department of Health Management Policy and EconomicsSchool of Public HealthTehran University of Medical SciencesTehranIran

Background Noncommunicable diseases(NCDs)are the main reasons of mortality *** of every two person is dying due to NCDs in *** policy actors,mainly the World Health Organization(WHO),published several reports and declarations on controlling and preventing *** study aimed to provide a situation for governance of NCDs in Afghanistan and proper solutions for identified *** We conducted qualitative research utilizing interpretive phenomenology.A self-developed questionnaire was developed to conduct the semi-structured interviews with 39 experts from *** results were analyzed using a deductive framework *** building block framework of health system developed by the WHO was used as predefined framework for this *** The governance building block of health system consists of five subthemes including policy making,planning,organizing,stewardship,and *** identified main strengths,weaknesses,opportunities,and challenges for these *** experts also provided key recommendations to address the *** Management of NCDs is a neglected part of the health system in *** evidence-based policy making with technical and indigenous planning,establishing responsive units with adequate financial and human resources within different ministries to address“health in all policies”concept,passing and implementing national laws and regulations to support national strategies for prevention and control of NCDs,and establishing decentralized monitoring systems to control the implementation of these strategies are the main recommendations of this *** government and international policy actors should invest and support the development of a multisectoral coordination system at national level for Afghanistan.

关键词： governance health in all policies health system multisectoral coordination noncommunicable diseases

The Changing of Common Priors in Sequential Auctions

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Journal of Systems Science & Complexity 2016年第5期29卷 1342-1357页

作者： QIAO Heng MA Jun School of economics Central University of Finance and Economics Business School University of International Business and Economics

In sequential auctions the phenomenon of declining prices is often observed, which in theory can be represented by a supermartingale. This paper employs the perspective that bidders' values may change over stages and the common priors are sequentially adjusted by the remaining bidders. It is shown that the declining price sequence can be explained by the adjustment of common priors between auctions. The adjustment of common priors is characterized by stochastic orders. Sufficient and necessary conditions for a supermartingale price sequence are derived.

关键词： First-price sealed-bid auction private-value paradigm sequential auctions.

Does the Belt and Road Initiative Promote Bilateral Political Relations?

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China & World Economy 2021年第5期29卷 57-83页

作者： Yue Lu Wei Gu Ka Zeng School of international trade and economics University of International Business and Economics(UIBE)China Department of economics The Chinese University of Hong KongChina Department of Political Science University of ArkansasUSA

This paper examines the role of the Belt and Road Initiative (BRI) in enhancing political relations between China and its partner countries. We postulate that an international economic cooperation scheme such as the BRI may facilitate commercial exchanges and increase the participating countries’ economic gains. This should generate incentives for these countries to avoid political tensions that may jeopardize mutually beneficial economic exchanges, and to expand the constellation of domestic coalitions in support of cordial diplomatic and political relations. We test the effect of the BRI on bilateral political relations using data on political relations between China and 91 countries along the BRI route between 2006 and 2018. Treating the promulgation of the BRI in 2013 as a policy shock, our difference-in-difference analysis lends substantial support to our hypotheses. Further analyses of the underlying causal mechanisms suggest that the BRI bolsters political relations by strengthening economic ties with partner countries through trade and investment related to economic cooperation.

关键词： BRI international economic cooperation political relations

China's Free trade Agreements with ASEAN,Japan and Korea:A Comparative Analysis

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China & World Economy 2012年第4期20卷 108-126页

作者： Gemma Estrada Donghyun Park Innwon Park Soonchan Park economics and Research Department Asian Development Bank(ADB) economics and Research Department ADB Division of international Studies Korea University Department of economics and international trade Kongju National University

The role of China in East Asia ＇s recovery from the recent global finaneial and economic crisis highlights China ＇s position as an engine of growth for this region. From the viewpoint of China, there are many potential gains from entering into free trade agreements （FTAs） with its neighbors, who collectively form a large and fast-growing market. In this paper, we qualitatively and quantitatively assess the four main permutations of China＇s FTAs with East Asian major economies： China-ASEAN, China-Japan, China-Korea and ASEAN＋ 3. We compare the effects of these FTAs on China ＂s output and welfare. Our comparative analysis shows that China will gain from all three bilateral FTAs, while gaining the most from the ASEAN＋ 3. Because forming a region-wide FTA, such as the ASEAN＋ 3, is expected to be gradual and difficult, China shouM continue to engage in bilateral FTAs as a mediumterm and alternative strategy. However, in the long term, China should pursue a regionwide FTA.

关键词： ASEAN China computable general equilibrium model East Asia free trade agreement

The Impact of High-standard Free trade Areas on the Diversification of China's Export Products: Expanding Market or Intensifying Competition?

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China & World Economy 2024年第4期32卷 33-67页

作者： Zhaobin Fan Ruimin Bian Hui Li international Business School Jinan UniversityChina School of Management Jinan UniversityChina School of Mathematics University of BirminghamUK

In the context of China's efforts to establish a global network of free trade areas and diversify its export products, this study explores the impact of trade agreement depth on China's export diversification. Building upon a trade model with multiproduct firms, we discover that the effect of trade agreement depth on export diversification is multifaceted, depending on the relative magnitude of the “market expansion effect” and the “competition intensification effect.” Through empirical analysis of China's exports to 132 countries (or regions) from 2000 to 2015, we find that the deepening of trade agreements affected China's export diversification negatively. This negative correlation was predominantly due to the similarity in comparative advantages between China and its trade partners, leading to the “competition intensification effect” overshadowing the “market expansion effect.” We also note that “natural” agreements, when deepened, were more likely to affect China's export diversification adversely than their “non-natural” counterparts. Moreover, as export diversification increased, the marginal impact of deepening trade agreements exhibited an inverted U-shaped trajectory.

关键词： export product diversification export similarity high-standard free trad areas trade agreement depth

CLUSTER-BASED REGULARIZED SLICED INVERSE REGRESSION FOR FORECASTING MACROECONOMIC VARIABLES

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Journal of Systems Science & Complexity 2014年第1期27卷 75-91页

作者： YU Yue CHEN Zhihong YANG Jie tradeLink L.L.CS. Wacker Drive Suite 1900 Chicago Illinois USA. School of international trade and: economics University of International Business and Economics BeijingChina. Department of Mathematics Statistics and Computer Science University of Illinois at Chicago Chicago Illinois USA.

This paper concerns the dimension reduction in regression for large data set. The authors introduce a new method based on the sliced inverse regression approach, cMled cluster-based regularized sliced inverse regression. The proposed method not only keeps the merit of considering both response and predictors＇ information, but also enhances the capability of handling highly correlated variables. It is justified under certain linearity conditions. An empirical application on a macroeconomic data set shows that the proposed method has outperformed the dynamic factor model and other shrinkage methods.

关键词： Cluster-based forecast macroeconomics sliced inverse regression.

China＇s Opening up after 40 Years： Standing at a Historic Turning Point

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China & World Economy 2018年第2期26卷 23-49页

作者： Jiandong Ju Xinding Yu Jiandong Ju Professor PBC School of Finance Tsinghua University China Associate Professor School of International Trade and Economics University of International Business and Economics China

This paper comprehensively reviews China＇s openness since 1978 from three aspects： trade, foreign investment and global production sharing. We point out that the economic development of China is now standing at a historic turning point. Specifically, economic changes in China are discassed from four dimensions：（i） from China being a world assembly line to a world manufacturing powerhouse; （ii） from China being a world capital receiver to a world investor; （iii） from China being a world factory to a world market; and （iv） from the situation of ＂made in China＂ to ＂innovated in China.＂ At the same time, the global economic system has also reached a turning point. A ＂North America-Europe-Asia ＂ tri-polar system has formed, in which the USA, Germany and China, respectively, serve as the regional core economies.

关键词： foreign direct investment global production sharing reform and opening-up policy trade turning point

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Beyond Green

Beijing Review 2024年第36期67卷 22-23页

作者： Juan Enrique Serrano-Moreno Institute of international Studies University of Chile

What role will Chinese trade and investment play in Latin America's climate and sustainability efforts,particularly in Chile?To address this question,let's explore an unconventional comparison through two recent science fiction films-one from China and one from the U.S.-which offer distinct visions of humanity's future relationship with nature.

关键词： investment Latin humanity