随着片上多处理器系统核数的增加,当前一致性协议上存在的许多问题使共享存储系统复杂而低效.目前一些一致性协议极其复杂,例如MESI(modified exclusive shared or invalid)协议,存在众多的中间状态和竞争.并且这些协议还会导致额外失...随着片上多处理器系统核数的增加,当前一致性协议上存在的许多问题使共享存储系统复杂而低效.目前一些一致性协议极其复杂,例如MESI(modified exclusive shared or invalid)协议,存在众多的中间状态和竞争.并且这些协议还会导致额外失效通信,以及大量记录共享信息的目录存储开销(目录协议)或广播消息的网络开销(监听协议).对数据无竞争的程序实现了一种简单高效一致性协议VISU(valid/invalid states based on self-updating),这种协议基于自更新操作(self-updating)、只包含2个稳定状态(valid/invalid).所设计的两状态VISU协议消除了目录和间接事务.首先基于并行编程的数据无竞争(data race free, DRF)模型,采用在同步点进行自更新共享数据来保证正确性.其次利用动态识别私有和共享数据的技术,提出了对私有数据进行写回、对共享数据进行写直达的方案.对于私有数据,简单的写回策略能够简化不必要的片上通信.在L1 cache中,对于共享数据的写直达方式能确保LLC(last level cache)中数据最新从而消除了几乎所有的一致性状态.实现的VISU协议开销低、不需要目录、没有间接传输和众多的一致性状态,且更加容易验证,同时获得了与MESI目录协议几乎相当甚至更优的性能.展开更多
Image denoising has remained a fundamental problem in the field of image processing. With Wavelet transforms, various algorithms for denoising in wavelet domain were introduced. Wavelets gave a superior performance in...Image denoising has remained a fundamental problem in the field of image processing. With Wavelet transforms, various algorithms for denoising in wavelet domain were introduced. Wavelets gave a superior performance in image denoising due to its properties such as multi-resolution. The problem of estimating an image that is corrupted by Additive White Gaussian Noise has been of interest for practical and theoretical reasons. Non-linear methods especially those based on wavelets have become popular due to its advantages over linear methods. Here I applied non-linear thresholding techniques in wavelet domain such as hard and soft thresholding, wavelet shrinkages such as Visu-shrink (non-adaptive) and SURE, Bayes and Normal Shrink (adaptive), using Discrete Stationary Wavelet Transform (DSWT) for different wavelets, at different levels, to denoise an image and determine the best one out of them. Performance of denoising algorithm is measured using quantitative performance measures such as Signal-to-Noise Ratio (SNR) and Mean Square Error (MSE) for various thresholding techniques.展开更多
Couplets financial literature,calligraphy and seal carving is an important part of traditional Chinese culture.To create a space of traditional architecture couplets attaches great importance to the overall order of;c...Couplets financial literature,calligraphy and seal carving is an important part of traditional Chinese culture.To create a space of traditional architecture couplets attaches great importance to the overall order of;convey the connotation,but also to convey a visual space;Joining Sentences people across time and space of unlimited imagination,greatly sublimation of the people's psychological space and beyond time and spaceextension,easy to create an image space.The couplet has become to create one of the indispensable element of traditional Chinese architectural conception of space.展开更多
An accurate and robust approach for tracking and guiding multiple laser beams is developed, which can be applied to the task of beam and target alignment. Multiple laser spots are firstly detected and recognized from ...An accurate and robust approach for tracking and guiding multiple laser beams is developed, which can be applied to the task of beam and target alignment. Multiple laser spots are firstly detected and recognized from the image sequences of the target and laser spots. Then, the contour tracking algorithm based on the chain code is investigated, in which the shape matching scheme based on the invariant moments is employed to distinguish different spots. When occlusion occurs in the multiple spots tracking procedure,the contour tracking combined with Kalman filter prediction is proposed to obtain the positions of multiple spots in real-time. In order to guide 3 spots to align the target, an incremental proportional integral(PI) controller is employed to make the image features of spots converge to the desired ones. Comparative experiments show that, the proposed tracking method can successfully cope with the fast motion, partial or complete occlusion. The experiment results on spots guiding also exhibit the accurate and robust performance of the strategy. The proposed visual system solves the problem of spots mixing, reduces the alignment time, improves the shooting accuracy and has been successfully applied to the experimental platform.展开更多
Howard Gardner pointed out that there are different kinds of intelligence in each person, including linguistic and visual intelli gence. Movie is a new medium for English language teaching. Because the visual element ...Howard Gardner pointed out that there are different kinds of intelligence in each person, including linguistic and visual intelli gence. Movie is a new medium for English language teaching. Because the visual element can be presented along with the Linguistic fea tures. This thesis focuses on using movies in language teaching. It explains why and how we can use English movies in teaching listening and speaking, and it also gives some suggestions and examples about how to use English movies in English language teaching.展开更多
文摘随着片上多处理器系统核数的增加,当前一致性协议上存在的许多问题使共享存储系统复杂而低效.目前一些一致性协议极其复杂,例如MESI(modified exclusive shared or invalid)协议,存在众多的中间状态和竞争.并且这些协议还会导致额外失效通信,以及大量记录共享信息的目录存储开销(目录协议)或广播消息的网络开销(监听协议).对数据无竞争的程序实现了一种简单高效一致性协议VISU(valid/invalid states based on self-updating),这种协议基于自更新操作(self-updating)、只包含2个稳定状态(valid/invalid).所设计的两状态VISU协议消除了目录和间接事务.首先基于并行编程的数据无竞争(data race free, DRF)模型,采用在同步点进行自更新共享数据来保证正确性.其次利用动态识别私有和共享数据的技术,提出了对私有数据进行写回、对共享数据进行写直达的方案.对于私有数据,简单的写回策略能够简化不必要的片上通信.在L1 cache中,对于共享数据的写直达方式能确保LLC(last level cache)中数据最新从而消除了几乎所有的一致性状态.实现的VISU协议开销低、不需要目录、没有间接传输和众多的一致性状态,且更加容易验证,同时获得了与MESI目录协议几乎相当甚至更优的性能.
文摘Image denoising has remained a fundamental problem in the field of image processing. With Wavelet transforms, various algorithms for denoising in wavelet domain were introduced. Wavelets gave a superior performance in image denoising due to its properties such as multi-resolution. The problem of estimating an image that is corrupted by Additive White Gaussian Noise has been of interest for practical and theoretical reasons. Non-linear methods especially those based on wavelets have become popular due to its advantages over linear methods. Here I applied non-linear thresholding techniques in wavelet domain such as hard and soft thresholding, wavelet shrinkages such as Visu-shrink (non-adaptive) and SURE, Bayes and Normal Shrink (adaptive), using Discrete Stationary Wavelet Transform (DSWT) for different wavelets, at different levels, to denoise an image and determine the best one out of them. Performance of denoising algorithm is measured using quantitative performance measures such as Signal-to-Noise Ratio (SNR) and Mean Square Error (MSE) for various thresholding techniques.
文摘Couplets financial literature,calligraphy and seal carving is an important part of traditional Chinese culture.To create a space of traditional architecture couplets attaches great importance to the overall order of;convey the connotation,but also to convey a visual space;Joining Sentences people across time and space of unlimited imagination,greatly sublimation of the people's psychological space and beyond time and spaceextension,easy to create an image space.The couplet has become to create one of the indispensable element of traditional Chinese architectural conception of space.
基金supported by National Natural Science Foundation of China(Nos.61227804 and 61105036)
文摘An accurate and robust approach for tracking and guiding multiple laser beams is developed, which can be applied to the task of beam and target alignment. Multiple laser spots are firstly detected and recognized from the image sequences of the target and laser spots. Then, the contour tracking algorithm based on the chain code is investigated, in which the shape matching scheme based on the invariant moments is employed to distinguish different spots. When occlusion occurs in the multiple spots tracking procedure,the contour tracking combined with Kalman filter prediction is proposed to obtain the positions of multiple spots in real-time. In order to guide 3 spots to align the target, an incremental proportional integral(PI) controller is employed to make the image features of spots converge to the desired ones. Comparative experiments show that, the proposed tracking method can successfully cope with the fast motion, partial or complete occlusion. The experiment results on spots guiding also exhibit the accurate and robust performance of the strategy. The proposed visual system solves the problem of spots mixing, reduces the alignment time, improves the shooting accuracy and has been successfully applied to the experimental platform.
文摘Howard Gardner pointed out that there are different kinds of intelligence in each person, including linguistic and visual intelli gence. Movie is a new medium for English language teaching. Because the visual element can be presented along with the Linguistic fea tures. This thesis focuses on using movies in language teaching. It explains why and how we can use English movies in teaching listening and speaking, and it also gives some suggestions and examples about how to use English movies in English language teaching.
