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Whether preexisting sarcopenia is an independent risk factor for postoperative pneumonia (POP) for patients with oral cavity squamous cell carcinoma (OCSCC) remains unclear. Therefore, we conducted a propensity score-matched population-based cohort study to compare the risk of acute and late POP for patients with sarcopenic and nonsarcopenic OCSCC who underwent curative surgery.We included patients with OCSCC who underwent curative surgery and categorized them into 2 groups depending on whether they had preexisting sarcopenia. The patients in the sarcopenic and nonsarcopenic groups were matched at a ratio of 2:1.The matching process yielded 16,257 patients (10,822 without sarcopenia and 5,435 with sarcopenia). In multivariate Cox regression analyses, the adjusted hazard ratio of POP for the group with OCSCC with preexisting sarcopenia was 1.20 (95% CI, 1.14-1.26; P.0001) compared with the nonsarcopenic group. Among the patients with OCSCC who received curative surgery, those in the sarcopenic group exhibited a higher POP risk than those in the nonsarcopenic group for the following postoperative time periods: 31st to 90th day, 91st day to first year, first to second year, second to third year, third to fourth year, and fourth to fifth year.The high incidence of pneumonia persists for a long time in patients with OCSCC who receive curative surgery; this high incidence may even persist for 5 years after surgery, especially in patients with sarcopenia. For susceptible patients who are at risk for OCSCC, sarcopenia prevention measures (eg, exercise and early nutrition intervention) should be implemented.

In view of the seriously drought and the condition that the water level in Changsha reach continuously break the historical lowest records in recent years, the variation law of low water level in Changsha reach and the impact of the Three Gorges Projects operation on low water level were studied. The results show that the water level in the same discharge and the monthly averaged water level and the lowest water level all decrease year by year, and the appearance time of the lowest water level in recent years is earlier. The lowest water level in Changsha reach isnt much connected with the variation of water level in Dongting lake, but connected with the riverbed undercutting caused by the operation of hydro-junction and the excavation of sand. The appearance time advance of the lowest water level is connected with the Three Gorges Projects operation.

With the development of sensing technologies and popularization of intelligent mobile phone, crowd-sensing has entered the central stage of mobile computing. A huge amount of sensing data collected from all kinds of mobile intelligent terminals form lots of files with different sizes, which need to be effectively data stored method into a file system or a data warehouse. To solve these problems, a hybrid file storage method is designed in the paper, which can support hybrid storage for all kinds of files from sensors of crowd-sensing process by classifying files to big files and small files, and storing these two types of files by different storing and transferring strategies. In addition, a load balancing method of metadata servers based on a genetic algorithm is also proposed to make file storage more adaptive to dynamic changing loads. Finally, experiments have been conducted to verify the effectiveness of storage method for files sensing data designed in the paper.