Flash memory does not allow data to be updated in place, and the copy-on-write strategy is adopted by most flash storage devices. The copy-on-write strategy in modern FTLs provides an excellent opportunity for offloading the burden of guaranteeing the transactional atomicity from a host system to flash storage and for supporting atomic update propagation. This paper presents X-FTL as a model ca...

Monte Carlo computer simulations were used to investigate the performance of three X 2 test statistics in confirmatory factor analysis (CFA). Normal theory maximum likelihood )~2 (ML), Browne's asymptotic distribution free X 2 (ADF), and the Satorra-Bentler rescaled X 2 (SB) were examined under varying conditions of sample size, model specification, and multivariate distribution. For properly s...

P2P file sharing provides a powerful content distribution model by leveraging users’ computing and bandwidth resources. However, companies have been reluctant to rely on P2P systems for paid content distribution due to their inability to limit the exploitation of these systems for free file sharing. We present TP2, a system that combines the more cost-effective and scalable distribution capabil...

BitTorrent is undoubtedly the most popular P2P file sharing systems in existence that has been able to attract millions of users. BitTorrent depends on global components for file search, engages a moderator system to guarantee the data integrity of file, and uses an exchange mechanism for file sharing in order to discourage users from free-riding. We conduct one of the largest measurement and a...

Nowadays, the commonly used table lookup scheme for IP routing is based on the so-called classless interdomain routing (CIDR). With CIDR, routers must find out the best matching prefix (BMP) for IP packets forwarding, which complicates the IP lookup. Since the IP lookup performance is a major design issue for the new generation routers, in this article we investigate the properties of the routi...

Evaluation (or assessment)-time bias can arise in oncology trials that study progression-free survival (PFS) when randomized groups have different patterns of timing of assessments. Modelling or computer simulation is sometimes used to explore the extent of such bias; valid results require building such simulations under realistic assumptions concerning the timing of assessments. This paper con...

We compare and contrast long-term file system activity for different Unix environments for periods of 120 to 280 days. Our focus is on finding common long-term activity trends and reference patterns. Our analysis shows that 90% of all files are not used after initial creation, those that are used are normally short-lived, and that if a file is not used in some manner the day after it is created...

This paper introduces a new concept called MultiCollective I/O (MCIO) that extends conventional collective I/O to optimize I/O accesses to multiple arrays simultaneously. In this approach, as in collective I/O, multiple processors co-ordinate to perform I/O on behalf of each other if doing so improves overall I/O time. However, unlike collective I/O, MCIO considers multiple arrays simultaneousl...

Carotid intima-media thickness (C-IMT) measurements provide a non-invasive assessment of subclinical atherosclerosis. The aim of the study was to assess the inter- and intra-observer variability of automated C-IMT measurements undertaken by two novice operators using the Panasonic CardioHealth Station. Participants were free from cardio-metabolic disease, and each underwent serial bilateral C-I...