A new electrocardiogram(ECG) data compression method is presented.It employs a repeated coding.In this method beat templates are extracted from original signals according to the features of ECG.The data are divided in...A new electrocardiogram(ECG) data compression method is presented.It employs a repeated coding.In this method beat templates are extracted from original signals according to the features of ECG.The data are divided into three parts:beat template,residual and position parameter.The three separate parts are first encoded with LADT,and then use the lossless entropy encoding to maintain a low level of reconstructed waveform distortion.The entropy encoding based on Huffman encoding is employed here as an example.Selections from the MIT BIH arrhythmia database,show that there is substantial improvement in compression ratio (CR) over other single and simple compression methods for comparable percent root mean square difference(PRD).展开更多
The three-dimensional structure of recombinant hepatitis B core antigen（HBcAg） particles truncated at residue 154（HBcAg-154） was determined to 7.8 A resolution by cryo-electron microscopy（cryoEM） and computer re...The three-dimensional structure of recombinant hepatitis B core antigen（HBcAg） particles truncated at residue 154（HBcAg-154） was determined to 7.8 A resolution by cryo-electron microscopy（cryoEM） and computer reconstruction.The capsid of HBcAg-154 is mainly constituted by α-helical folds,highly similar to that of HBcAg-149.The C-terminal region between residues 155 and 183 of the core protein is more crucial to the encapsidation of RNA,and the short C-terminal tail of HBcAg-154 results in a nearly empty capsid.展开更多
文摘A new electrocardiogram(ECG) data compression method is presented.It employs a repeated coding.In this method beat templates are extracted from original signals according to the features of ECG.The data are divided into three parts:beat template,residual and position parameter.The three separate parts are first encoded with LADT,and then use the lossless entropy encoding to maintain a low level of reconstructed waveform distortion.The entropy encoding based on Huffman encoding is employed here as an example.Selections from the MIT BIH arrhythmia database,show that there is substantial improvement in compression ratio (CR) over other single and simple compression methods for comparable percent root mean square difference(PRD).
基金supported by special funds of the National Natural Science Foundation of China (Grant No. 10274106)
文摘The three-dimensional structure of recombinant hepatitis B core antigen（HBcAg） particles truncated at residue 154（HBcAg-154） was determined to 7.8 A resolution by cryo-electron microscopy（cryoEM） and computer reconstruction.The capsid of HBcAg-154 is mainly constituted by α-helical folds,highly similar to that of HBcAg-149.The C-terminal region between residues 155 and 183 of the core protein is more crucial to the encapsidation of RNA,and the short C-terminal tail of HBcAg-154 results in a nearly empty capsid.
