文章探讨了同步数字体系(Synchronous Digital Hierarchy,SDH)数字微波通信技术的关键特点,包括交叉极化干扰抵消(Cross-Polarisation Interference Counteracter,XPIC)技术、系统编码调制技术、时域与频域的自适应均衡处理技术以及网...文章探讨了同步数字体系(Synchronous Digital Hierarchy,SDH)数字微波通信技术的关键特点,包括交叉极化干扰抵消(Cross-Polarisation Interference Counteracter,XPIC)技术、系统编码调制技术、时域与频域的自适应均衡处理技术以及网管分集技术,分析了SDH数字微波通信在远程通信和灾难恢复方面的应用实践,实现了更高效率的数据传输和更强的信号稳定性。这些技术的应用不仅提升了通信质量和可靠性,而且拓宽了SDH数字微波通信在各领域的应用范围,标志着通信技术向更高层次的演进。展开更多
Previous work mostly employs an ideal system model that assumes fully connected processors and concurrent communication, which leads to inaccurate and inegicient schedule results. In this paper, a new scheduling model...Previous work mostly employs an ideal system model that assumes fully connected processors and concurrent communication, which leads to inaccurate and inegicient schedule results. In this paper, a new scheduling model which integrates the communication awareness was proposed. Then, a novel scheduling algorithm based on list heuristic was put forward for the new model, which can produce optimal schedule by serializing the communications edges. Experimental results show that the accuracy and efficiency of the new model and algorithm are significantly improved.展开更多
An improved scalar Costa scheme (SCS) was proposed by using improved Watson perceptual model to adaptively decide quantization step size and scaling factor. The improved scheme equals to embed hiding data based on an ...An improved scalar Costa scheme (SCS) was proposed by using improved Watson perceptual model to adaptively decide quantization step size and scaling factor. The improved scheme equals to embed hiding data based on an actual image. In order to withstand amplitude scaling attack, the Watson perceptual model was redefined, and the improved scheme using the new definition can insure quantization step size in decoder that is proportional to amplitude scaling attack factor. The performance of the improved scheme outperforms that of SCS with fixed quantization step size. The improved scheme combines information theory and visual model.展开更多
A smartphone-based context-aware augmentative and alternative communication(AAC) was applied was in order to enhance the user's experience by providing simple, adaptive, and intuitive interfaces. Various potential...A smartphone-based context-aware augmentative and alternative communication(AAC) was applied was in order to enhance the user's experience by providing simple, adaptive, and intuitive interfaces. Various potential context-aware technologies and AAC usage scenarios were studied, and an efficient communication system was developed by combining smartphone's multimedia functions and its optimized sensor technologies. The experimental results show that context-awareness accuracy is achieved up to 97%.展开更多
文摘文章探讨了同步数字体系(Synchronous Digital Hierarchy,SDH)数字微波通信技术的关键特点,包括交叉极化干扰抵消(Cross-Polarisation Interference Counteracter,XPIC)技术、系统编码调制技术、时域与频域的自适应均衡处理技术以及网管分集技术,分析了SDH数字微波通信在远程通信和灾难恢复方面的应用实践,实现了更高效率的数据传输和更强的信号稳定性。这些技术的应用不仅提升了通信质量和可靠性,而且拓宽了SDH数字微波通信在各领域的应用范围,标志着通信技术向更高层次的演进。
基金the National Natural Science Foundation of China(No60503048,60672059)the National High Technology Research and Development Program of China(No2006AA01Z233)
文摘Previous work mostly employs an ideal system model that assumes fully connected processors and concurrent communication, which leads to inaccurate and inegicient schedule results. In this paper, a new scheduling model which integrates the communication awareness was proposed. Then, a novel scheduling algorithm based on list heuristic was put forward for the new model, which can produce optimal schedule by serializing the communications edges. Experimental results show that the accuracy and efficiency of the new model and algorithm are significantly improved.
基金The National Basic Research Program (973) of China (No. 2005CB321804)
文摘An improved scalar Costa scheme (SCS) was proposed by using improved Watson perceptual model to adaptively decide quantization step size and scaling factor. The improved scheme equals to embed hiding data based on an actual image. In order to withstand amplitude scaling attack, the Watson perceptual model was redefined, and the improved scheme using the new definition can insure quantization step size in decoder that is proportional to amplitude scaling attack factor. The performance of the improved scheme outperforms that of SCS with fixed quantization step size. The improved scheme combines information theory and visual model.
基金Project supported by the Changwon National University(2013-2014),Korea
文摘A smartphone-based context-aware augmentative and alternative communication(AAC) was applied was in order to enhance the user's experience by providing simple, adaptive, and intuitive interfaces. Various potential context-aware technologies and AAC usage scenarios were studied, and an efficient communication system was developed by combining smartphone's multimedia functions and its optimized sensor technologies. The experimental results show that context-awareness accuracy is achieved up to 97%.
