中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共3条，第1-3条

帮助

条数/页：排序方式：
	Algebra-Assisted Construction of Quasi-Cyclic LDPC Codes for 5G New Radio 期刊论文 OAI收割 IEEE ACCESS, 2018, 卷号: 6, 页码: 50229-50244 作者: Li, Huaan; Bai, Baoming; Mu, Xijin; Zhang, Ji; Xu, Hengzhou \| 收藏 \| 浏览/下载：21/0 \| 提交时间：2019/12/10 Quasi-cyclic LDPC code 5G channel codes algebra-assisted construction multiple lifting size cycle analysis
	Wavelet packet and neural network basis medical image compression (EI CONFERENCE) 会议论文 OAI收割 4th International Conference on Photonics and Imaging in Biology and Medicine, September 3, 2005 - September 6, 2005, Tianjin, China Zhao X.; Wei J.; Zhai L. 收藏 \| 浏览/下载：21/0 \| 提交时间：2013/03/25 It is difficult to get high compression ratio and good reconstructed image by conventional methods we give a new method of compression on medical image. It is to decompose and reconstruct the medical image by wavelet packet. Before the construction the image use neural network in place of other coding method to code the coefficients in the wavelet packet domain. By using the Kohonen's neural network algorithm not only for its vector quantization feature but also for its topological property. This property allows an increase of about 80% for the compression rate. Compared to the JPEG standard this compression scheme shows better performances (in terms of PSNR) for compression rates higher than 30. This method can get big compression ratio and perfect PSNR. Results show that the image can be compressed greatly and the original image can be recovered well. In addition the approach can be realized easily by hardware.
	On constant-composition codes over Z(q) 期刊论文 OAI收割 IEEE TRANSACTIONS ON INFORMATION THEORY, 2003, 卷号: 49, 期号: 11, 页码: 3010-3016 作者: Luo, Y; Fu, FW; Vinck, AJH; Chen, W \| 收藏 \| 浏览/下载：24/0 \| 提交时间：2018/07/30 code construction constant-composition code constant-weight code Hadamard matrix Johnson bound Plotkin bound simplex code