The regional climate change index （RCCI） is employed to investigate hot-spots under 21st century global warming over East Asia. The RCCI is calculated on a 1-degree resolution grid from the ensemble of CMIP3 simulat...The regional climate change index （RCCI） is employed to investigate hot-spots under 21st century global warming over East Asia. The RCCI is calculated on a 1-degree resolution grid from the ensemble of CMIP3 simulations for the B1, AIB, and A2 IPCC emission scenarios. The RCCI over East Asia exhibits marked sub-regional variability. Five sub-regional hot-spots are identified over the area of investigation： three in the northern regions （Northeast China, Mongolia, and Northwest China）, one in eastern China, and one over the Tibetan Plateau. Contributions from different factors to the RCCI are discussed for the sub-regions. Analysis of the temporal evolution of the hot-spots throughout the 21st century shows different speeds of response time to global warming for the different sub-regions. Hot-spots firstly emerge in Northwest China and Mongolia. The Northeast China hot-spot becomes evident by the mid of the 21st century and it is the most prominent by the end of the century. While hot-spots are generally evident in all the 5 sub-regions for the A1B and A2 scenarios, only the Tibetan Plateau and Northwest China hot-spots emerge in the B1 scenario, which has the lowest greenhouse gas （GHG） concentrations. Our analysis indicates that subregional hot-spots show a rather complex spatial and temporal dependency on the GHG concentration and on the different factors contributing to the RCCI.展开更多
Camera calibration is critical in computer vision measurement system, affecting the accuracy of the whole system. Many camera calibration methods have been proposed, but they cannot consider precision and operation co...Camera calibration is critical in computer vision measurement system, affecting the accuracy of the whole system. Many camera calibration methods have been proposed, but they cannot consider precision and operation complexity at the same time. In this paper, a new technique is proposed to calibrate camera. Firstly, the global calibration method is described in de-tail. It requires the camera to observe a checkerboard pattern shown at a few different orientations. The checkerboard corners are obtained by Harris algorithm. With direct linear transformation and non-linear optimal algorithm, the global calibration pa-rameters are obtained. Then, a sub-regional method is proposed. Those corners are divided into two groups, middle corners and edge corners, which are used to calibrate the corresponding area to get two sets of calibration parameters. Finally, some experimental images are used to test the proposed method. Experimental results demonstrate that the average projection error of sub-region method is decreased at least 16% compared with the global calibration method. The proposed technique is simple and accurate. It is suitable for the industrial computer vision measurement.展开更多
Our River of Peace and Sustainable Development. This was the theme of the Second Lancang-Mekong Cooperation （LMC） Leaders＇ Meeting in Cambodia, on which the curtain was lowered on January 10. The conference resulte...Our River of Peace and Sustainable Development. This was the theme of the Second Lancang-Mekong Cooperation （LMC） Leaders＇ Meeting in Cambodia, on which the curtain was lowered on January 10. The conference resulted in the release of the Phnom Penh Declaration and the adoption of the Five- Year Plan of Action on Lancang-Mekong Cooperation （2018-22）. These documents are expected to chart the course for the LMC＇s development into the next decade.展开更多
Ever since President Xi Jinping announced the ＇One Belt, One Road＇ project in 2013, more than 66 countries across the continent expressed their interest to be part of this grand project of the century. In South Asia...Ever since President Xi Jinping announced the ＇One Belt, One Road＇ project in 2013, more than 66 countries across the continent expressed their interest to be part of this grand project of the century. In South Asia, most of the countries embraced the idea except India. There is no doubt that OBOR is likely to have farreaching implications on South Asian politics, economy and security. China has been engaging in the region through various economic and development projects for last two decades. This has raised serious security and strategic concerns in India. China＇s growing bilateral trade investments and development-oriented connectivity projects in India＇s neighbourhood have been popularly dubbed as China＇s ＇String of Pearl Strategy＇ aimed to contract India＇s sphere of influence in the region. There is a deficit of trust between emerging India and rising China over their interests and intentions. Many observers, however, view OBOR as a game changer at least in South Asia, where this would necessitate re-alignment and re-balancing. But, how does India perceive this project is a matter of serious concern that would shape the nature of implications on South Asia？ In this context, this article examines the impact of OBOR on South Asia Region from sub-regional perspectives and it explores how China can play a constructive role by reconciling its grand strategy with national interests of South Asian countries in order to minimise the adverse impact of OBOR [especially China-Pakistan Economic Corridor （CPEC）] on the peace and security of the region through effective CBMs.展开更多
基金supported by the National Basic Research Program(2009CB421407,2006CB403707,and 2007BAC03A01)the R & D Special Fund for Public Welfare Industry(meteorol-ogy)(GYHY200806010)Chinese Academy of Sciences(Grant NOKZCX2-YW-Q1-02)
文摘The regional climate change index （RCCI） is employed to investigate hot-spots under 21st century global warming over East Asia. The RCCI is calculated on a 1-degree resolution grid from the ensemble of CMIP3 simulations for the B1, AIB, and A2 IPCC emission scenarios. The RCCI over East Asia exhibits marked sub-regional variability. Five sub-regional hot-spots are identified over the area of investigation： three in the northern regions （Northeast China, Mongolia, and Northwest China）, one in eastern China, and one over the Tibetan Plateau. Contributions from different factors to the RCCI are discussed for the sub-regions. Analysis of the temporal evolution of the hot-spots throughout the 21st century shows different speeds of response time to global warming for the different sub-regions. Hot-spots firstly emerge in Northwest China and Mongolia. The Northeast China hot-spot becomes evident by the mid of the 21st century and it is the most prominent by the end of the century. While hot-spots are generally evident in all the 5 sub-regions for the A1B and A2 scenarios, only the Tibetan Plateau and Northwest China hot-spots emerge in the B1 scenario, which has the lowest greenhouse gas （GHG） concentrations. Our analysis indicates that subregional hot-spots show a rather complex spatial and temporal dependency on the GHG concentration and on the different factors contributing to the RCCI.
基金Tianjin Research Program of Application Foundation and Advanced Technology(No.14JCYBJC18600,No.14JCZDJC39700)the National Key Scientific Instrument and Equipment Development Project(No.2013YQ17053903)
文摘Camera calibration is critical in computer vision measurement system, affecting the accuracy of the whole system. Many camera calibration methods have been proposed, but they cannot consider precision and operation complexity at the same time. In this paper, a new technique is proposed to calibrate camera. Firstly, the global calibration method is described in de-tail. It requires the camera to observe a checkerboard pattern shown at a few different orientations. The checkerboard corners are obtained by Harris algorithm. With direct linear transformation and non-linear optimal algorithm, the global calibration pa-rameters are obtained. Then, a sub-regional method is proposed. Those corners are divided into two groups, middle corners and edge corners, which are used to calibrate the corresponding area to get two sets of calibration parameters. Finally, some experimental images are used to test the proposed method. Experimental results demonstrate that the average projection error of sub-region method is decreased at least 16% compared with the global calibration method. The proposed technique is simple and accurate. It is suitable for the industrial computer vision measurement.
文摘Our River of Peace and Sustainable Development. This was the theme of the Second Lancang-Mekong Cooperation （LMC） Leaders＇ Meeting in Cambodia, on which the curtain was lowered on January 10. The conference resulted in the release of the Phnom Penh Declaration and the adoption of the Five- Year Plan of Action on Lancang-Mekong Cooperation （2018-22）. These documents are expected to chart the course for the LMC＇s development into the next decade.
文摘Ever since President Xi Jinping announced the ＇One Belt, One Road＇ project in 2013, more than 66 countries across the continent expressed their interest to be part of this grand project of the century. In South Asia, most of the countries embraced the idea except India. There is no doubt that OBOR is likely to have farreaching implications on South Asian politics, economy and security. China has been engaging in the region through various economic and development projects for last two decades. This has raised serious security and strategic concerns in India. China＇s growing bilateral trade investments and development-oriented connectivity projects in India＇s neighbourhood have been popularly dubbed as China＇s ＇String of Pearl Strategy＇ aimed to contract India＇s sphere of influence in the region. There is a deficit of trust between emerging India and rising China over their interests and intentions. Many observers, however, view OBOR as a game changer at least in South Asia, where this would necessitate re-alignment and re-balancing. But, how does India perceive this project is a matter of serious concern that would shape the nature of implications on South Asia？ In this context, this article examines the impact of OBOR on South Asia Region from sub-regional perspectives and it explores how China can play a constructive role by reconciling its grand strategy with national interests of South Asian countries in order to minimise the adverse impact of OBOR [especially China-Pakistan Economic Corridor （CPEC）] on the peace and security of the region through effective CBMs.
