DDR(Double Date Rate--双倍数据速率)是一种革命性的高带宽内存技术,是基于目前的单倍数据速率SDR(Single Data Rate)内存构架而发展出的新一代内存,他的出现彻底地改善了内存子系统的性能,使之达到2.7GB/Sec的峰值传输率,并且使高带...DDR(Double Date Rate--双倍数据速率)是一种革命性的高带宽内存技术,是基于目前的单倍数据速率SDR(Single Data Rate)内存构架而发展出的新一代内存,他的出现彻底地改善了内存子系统的性能,使之达到2.7GB/Sec的峰值传输率,并且使高带宽可以在低得多的核心电压(2.5V)上运行。这款内存为Kingston所推出的DDR333内存,容量为128MB,其产品型号为KVR333X64C25/128。在产品规格方面,属于PC2700的规格,内存的工作频率为333MHz,工作电压为2.5V,数据传输量为每秒2664MB(333MHz×8byte)。内存的布局结构为184根针脚,内存芯片设计为单面单排共8块的形式,每一个芯片的容量为16MB,芯片编号为NT5DS16M8AT-6。展开更多
The biggest insufficiency of the present mathematics is that it consists, in fact, of the eclectic mixture of two different models. In the first model, the world is taken as infinity and what is chosen as an element h...The biggest insufficiency of the present mathematics is that it consists, in fact, of the eclectic mixture of two different models. In the first model, the world is taken as infinity and what is chosen as an element here is the unit. Everything is measured by the multiples of the unit. According to the second model, this world is in unity and its mathematical manifestation is the unit. The world is between zero and one. Everything here is measured by fraction The simplified variants of the mathematical model of the world paves the way for the comparative analysis of its alternative philosophical interpretations.展开更多
Single instruction multiple data （SIMD） instructions are often implemented in modem media processors. Although SIMD instructions are useful in multimedia applications, most compilers do not have good support for SIM...Single instruction multiple data （SIMD） instructions are often implemented in modem media processors. Although SIMD instructions are useful in multimedia applications, most compilers do not have good support for SIMD instructions. This paper focuses on SIMD instructions generation for media processors. We present an efficient code optimization approach that is integrated into a retargetable C compiler. SIMD instructions are generated by finding and combining the same operations in programs. Experimental results for the UltraSPARC VIS instruction set show that a speedup factor up to 2.639 is obtained.展开更多
Objective: To investigate the distributions of human leukocyte antigen (HLA)-A and-B alleles and HLA-A-B haplotypes in the Yi ethnic minority of the Yunnan Province, situated in southwestern China. Methods: DNA typing...Objective: To investigate the distributions of human leukocyte antigen (HLA)-A and-B alleles and HLA-A-B haplotypes in the Yi ethnic minority of the Yunnan Province, situated in southwestern China. Methods: DNA typing for HLA-A and-B loci was performed using the polymerase chain reaction-sequence-based typing (PCR-SBT) method on 114 randomly selected healthy individuals of the Yi population. The allelic frequencies of HLA-A and-B loci were calculated by direct counting and HLA-A-B haplotypes were estimated using the expectation maximization algorithm. Results: A total of 17 HLA-A and 38 HLA-B alleles were found in the Yi population. The most frequent alleles were A2402 (32.46%), A1101 (26.32%), and A0203 (10.09%) at the HLA-A locus and B4601 (12.28%), B1525 (10.09%), B4001 (8.77%), and B3802 (7.89%) at the HLA-B locus. The predominant HLA-A-B haplotypes were A2402-B1525 (7.86%) and A0203-B3802 (5.64%), followed by A1101-B4001 (4.69%). Phylogenetic analysis indicates that the Yi population in the Honghe, Yunnan Province of China basically belongs to groups of southeastern Asian origin, but shares some characteristics with northeastern Asian groups. Conclusion: The present study may add to the understanding of HLA polymorphism in the Yi ethnic group that was poorly defined previously, and provide useful information for bone marrow transplantation, anthropological research, and forensic sciences as well as for disease-association studies.展开更多
文摘DDR(Double Date Rate--双倍数据速率)是一种革命性的高带宽内存技术,是基于目前的单倍数据速率SDR(Single Data Rate)内存构架而发展出的新一代内存,他的出现彻底地改善了内存子系统的性能,使之达到2.7GB/Sec的峰值传输率,并且使高带宽可以在低得多的核心电压(2.5V)上运行。这款内存为Kingston所推出的DDR333内存,容量为128MB,其产品型号为KVR333X64C25/128。在产品规格方面,属于PC2700的规格,内存的工作频率为333MHz,工作电压为2.5V,数据传输量为每秒2664MB(333MHz×8byte)。内存的布局结构为184根针脚,内存芯片设计为单面单排共8块的形式,每一个芯片的容量为16MB,芯片编号为NT5DS16M8AT-6。
文摘The biggest insufficiency of the present mathematics is that it consists, in fact, of the eclectic mixture of two different models. In the first model, the world is taken as infinity and what is chosen as an element here is the unit. Everything is measured by the multiples of the unit. According to the second model, this world is in unity and its mathematical manifestation is the unit. The world is between zero and one. Everything here is measured by fraction The simplified variants of the mathematical model of the world paves the way for the comparative analysis of its alternative philosophical interpretations.
文摘Single instruction multiple data （SIMD） instructions are often implemented in modem media processors. Although SIMD instructions are useful in multimedia applications, most compilers do not have good support for SIMD instructions. This paper focuses on SIMD instructions generation for media processors. We present an efficient code optimization approach that is integrated into a retargetable C compiler. SIMD instructions are generated by finding and combining the same operations in programs. Experimental results for the UltraSPARC VIS instruction set show that a speedup factor up to 2.639 is obtained.
基金Project supported by the National Natural Science Foundation of China (Nos. 30700470 and 30871348)the Shaan’xi Provincial Science and Technology Research and Development Project Fund (No. 2008K09-02), China
文摘Objective: To investigate the distributions of human leukocyte antigen (HLA)-A and-B alleles and HLA-A-B haplotypes in the Yi ethnic minority of the Yunnan Province, situated in southwestern China. Methods: DNA typing for HLA-A and-B loci was performed using the polymerase chain reaction-sequence-based typing (PCR-SBT) method on 114 randomly selected healthy individuals of the Yi population. The allelic frequencies of HLA-A and-B loci were calculated by direct counting and HLA-A-B haplotypes were estimated using the expectation maximization algorithm. Results: A total of 17 HLA-A and 38 HLA-B alleles were found in the Yi population. The most frequent alleles were A2402 (32.46%), A1101 (26.32%), and A0203 (10.09%) at the HLA-A locus and B4601 (12.28%), B1525 (10.09%), B4001 (8.77%), and B3802 (7.89%) at the HLA-B locus. The predominant HLA-A-B haplotypes were A2402-B1525 (7.86%) and A0203-B3802 (5.64%), followed by A1101-B4001 (4.69%). Phylogenetic analysis indicates that the Yi population in the Honghe, Yunnan Province of China basically belongs to groups of southeastern Asian origin, but shares some characteristics with northeastern Asian groups. Conclusion: The present study may add to the understanding of HLA polymorphism in the Yi ethnic group that was poorly defined previously, and provide useful information for bone marrow transplantation, anthropological research, and forensic sciences as well as for disease-association studies.
