X-Code is one of the most important redundant array of independent disk （RAID）-6 codes which are capable of tolerating double disk failures. However, the code length of X-Code is restricted to be a prime number, and...X-Code is one of the most important redundant array of independent disk （RAID）-6 codes which are capable of tolerating double disk failures. However, the code length of X-Code is restricted to be a prime number, and such code length restriction of X-Code limits its usage in the real storage systems. Moreover, as a vertical RAID-6 code, X-Code can not be extended easily to an arbitrary code length like horizontal RAID-6 codes. In this paper, a novel and efficient code shortening algorithm for X-Code is proposed to extend X-Code to an arbitrary length. It can be further proved that the code shortening algorithm maintains the maximum-distance-separable （MDS） property of X-Code, and namely, the shortened X-Code is still MDS code with the optimal space efficiency. In the context of the shortening algorithm for X-Code, an in-depth performance analysis on X-Code at consecutive code lengths is conducted, and the impacts of the code shortening algorithm on the performance of X-Code in various performance metrics are revealed.展开更多
原发性肝细胞癌(hepatocellular carcinoma,HCC)是目前常见的恶性肿瘤之一,引发HCC的主要危险因素是HBV感染。乙型肝炎病毒X蛋白(hepatitis B virus X protein,HBx)是HBV相关肝细胞癌的关键调节因子,能够促进癌症的发生。许多长链非编码...原发性肝细胞癌(hepatocellular carcinoma,HCC)是目前常见的恶性肿瘤之一,引发HCC的主要危险因素是HBV感染。乙型肝炎病毒X蛋白(hepatitis B virus X protein,HBx)是HBV相关肝细胞癌的关键调节因子,能够促进癌症的发生。许多长链非编码RNA(long non-coding RNA,lncRNA)能够导致HCC的发生,它们的主要功能包括促进HBV复制、上调癌基因或下调肿瘤抑制因子的表达,有些lncRNA还可以直接作为肿瘤抑制因子发挥作用,目前它们已经作为疾病治疗靶点被大量研究。该文将讨论经HBx调节的lncRNA在HBV诱导的HCC中的作用,并对肿瘤发生、发展的机制展开综述。展开更多
基金supported by the National Basic Research Program of China (Grant Nos.2011CB302300, 2011CB302301)the National High-Technology Research and Development Program of China (Grant Nos.2009AA01A401,2009AA01A402)+1 种基金the National Natural Science Foundation of China (Grant Nos.60873028, 60933002, 61025008)the Changjiang Innovation Group of Education of China (Grant No.IRT0725)
文摘X-Code is one of the most important redundant array of independent disk （RAID）-6 codes which are capable of tolerating double disk failures. However, the code length of X-Code is restricted to be a prime number, and such code length restriction of X-Code limits its usage in the real storage systems. Moreover, as a vertical RAID-6 code, X-Code can not be extended easily to an arbitrary code length like horizontal RAID-6 codes. In this paper, a novel and efficient code shortening algorithm for X-Code is proposed to extend X-Code to an arbitrary length. It can be further proved that the code shortening algorithm maintains the maximum-distance-separable （MDS） property of X-Code, and namely, the shortened X-Code is still MDS code with the optimal space efficiency. In the context of the shortening algorithm for X-Code, an in-depth performance analysis on X-Code at consecutive code lengths is conducted, and the impacts of the code shortening algorithm on the performance of X-Code in various performance metrics are revealed.
文摘原发性肝细胞癌(hepatocellular carcinoma,HCC)是目前常见的恶性肿瘤之一,引发HCC的主要危险因素是HBV感染。乙型肝炎病毒X蛋白(hepatitis B virus X protein,HBx)是HBV相关肝细胞癌的关键调节因子,能够促进癌症的发生。许多长链非编码RNA(long non-coding RNA,lncRNA)能够导致HCC的发生,它们的主要功能包括促进HBV复制、上调癌基因或下调肿瘤抑制因子的表达,有些lncRNA还可以直接作为肿瘤抑制因子发挥作用,目前它们已经作为疾病治疗靶点被大量研究。该文将讨论经HBx调节的lncRNA在HBV诱导的HCC中的作用,并对肿瘤发生、发展的机制展开综述。
