Formal verification is playing a significant role in IC design.However,the common models for verification either have their complexity problems or have applicable limitations.In order to overcome the deficiencies,a no...Formal verification is playing a significant role in IC design.However,the common models for verification either have their complexity problems or have applicable limitations.In order to overcome the deficiencies,a novel model-WGL(Weighted Generalized List)is proposed,which is based on the general-list decomposition of polynomials,with three different weights and manipulation rules introduced to effect node sharing and the canonicity.Timing parameters and operations on them are also considered.Examples show the word-level WGL is the only model to linearly represent the common word-level functions and the bit-level WGL is especially suitable for arithmetic intensive circuits.The model is proved to be a uniform and efficient model for both bit-level and word-level functions.Then based on the WGL model,a backward-construction verification approach is proposed,which reduces time and space complexity for multipliers to polynomial complexity(time complexity is less than O(n3.6)and space complexity is less than O(n1.5))without hierarchical partitioning.Both the model and the verification method show their theoretical and applicable significance in IC design.展开更多
Through the 5-channel SWAES digital full waveform AE detector, the paper dealt with the fracture process of coal and rock samples under uniaxial compression. Using wavelet operations of multi-scale discrete analysis t...Through the 5-channel SWAES digital full waveform AE detector, the paper dealt with the fracture process of coal and rock samples under uniaxial compression. Using wavelet operations of multi-scale discrete analysis the pulses of a particular time period （points） and the space domain signal by numerical method were gotten, and the paper concluded that the signal singularity in load rupture had closely relations with fracture and uniaxial compression. The detected position and the actual breaking point only differed at one sample point, the relative error was 6.82%, and there was no accumulative error. Thus it provided an effective method to solve the problem of instability analysis of the signal singularity detection and coal-rock compression failure in the whole process.展开更多
Dietary restriction(DR) is one of the most robust environmental manipulations that not only extend life span but also delay the onset of age-related diseases in almost every species examined. Caenorhabditis elegans pl...Dietary restriction(DR) is one of the most robust environmental manipulations that not only extend life span but also delay the onset of age-related diseases in almost every species examined. Caenorhabditis elegans plays an important role in aging studies due to its simple life cycle, easy genetic manipulations and highly conserved genome. Recent studies have demonstrated that the beneficial effects of DR are mediated by the highly conserved transcription factors and signaling pathways in C. elegans. Here we review recent progress in the methodology and molecular mechanisms of DR using C. elegans as a model, as well as prospects for future research.展开更多
基金Sponsored by the National Natural Science Foundation of China(Grant No.69973014and60273081)the Natural Science Foundation of Heilongjiang Province(Grant No.F0209)HEU Foundation(Grant No.HEUF04088).
文摘Formal verification is playing a significant role in IC design.However,the common models for verification either have their complexity problems or have applicable limitations.In order to overcome the deficiencies,a novel model-WGL(Weighted Generalized List)is proposed,which is based on the general-list decomposition of polynomials,with three different weights and manipulation rules introduced to effect node sharing and the canonicity.Timing parameters and operations on them are also considered.Examples show the word-level WGL is the only model to linearly represent the common word-level functions and the bit-level WGL is especially suitable for arithmetic intensive circuits.The model is proved to be a uniform and efficient model for both bit-level and word-level functions.Then based on the WGL model,a backward-construction verification approach is proposed,which reduces time and space complexity for multipliers to polynomial complexity(time complexity is less than O(n3.6)and space complexity is less than O(n1.5))without hierarchical partitioning.Both the model and the verification method show their theoretical and applicable significance in IC design.
基金Supported by the National Natural Science Foundation of China （51174157, 51174158）
文摘Through the 5-channel SWAES digital full waveform AE detector, the paper dealt with the fracture process of coal and rock samples under uniaxial compression. Using wavelet operations of multi-scale discrete analysis the pulses of a particular time period （points） and the space domain signal by numerical method were gotten, and the paper concluded that the signal singularity in load rupture had closely relations with fracture and uniaxial compression. The detected position and the actual breaking point only differed at one sample point, the relative error was 6.82%, and there was no accumulative error. Thus it provided an effective method to solve the problem of instability analysis of the signal singularity detection and coal-rock compression failure in the whole process.
基金supported by grants from the National Natural Science Foundation of China(31471379)Natural Science Foundation for Universities in Jiangsu Province,China(BK2014021506)to Chen Di
文摘Dietary restriction(DR) is one of the most robust environmental manipulations that not only extend life span but also delay the onset of age-related diseases in almost every species examined. Caenorhabditis elegans plays an important role in aging studies due to its simple life cycle, easy genetic manipulations and highly conserved genome. Recent studies have demonstrated that the beneficial effects of DR are mediated by the highly conserved transcription factors and signaling pathways in C. elegans. Here we review recent progress in the methodology and molecular mechanisms of DR using C. elegans as a model, as well as prospects for future research.
