基于GCC的抽象语法树对C++源程序结构的分析

源程序静态信息的提取是实现对源程序静态分析的基础,提取的静态信息的完整性、信息的规范性是静态分析的关键点。文章基于GCC编译器产生的AST(AbstractSyntaxTree)中间文件,给出了一种从AST文件中提取源程序的静态信息的方法,以XML(ExtensibleMarkupLanguage)标准格式输出,最后树形化地显示出源程序的结构关系。     

Evaluation of hypolipidemic effects of peanut skin-derived polyphenols in rats on Western-diet

The effect of water soluble polyphenolic extract of peanut skin (PE) was investigated for its hypolipidemic properties in rats on Western diet. Seven-weeks old Wistar rats received control diet (AIN-93G), Western diet with and without a bolus of PE five times a week for 10weeks. Group which received 300mg/kg body weight showed significantly reduced body weight and epididymal fat. Plasma and liver triglyceride (TG) and cholesterol (TC) levels were significantly reduced while faecal secretion of TG and TC was greatly increased upon PE administration. Liver mRNA expression of enzymes involved in fatty acid synthesis, such as fatty acid synthase (FAS), sterol receptor element binding protein (SREBP)-1c, acetyl-CoA carboxylase (ACC1) and lipid uptake genes, such as PPARγ, were decreased, while PPARα was up-regulated by administration of PE. These data suggest that administration of PE may contribute to the improved lipid homoeostasis in rats on diets high in cholesterol and lipids.     

C/C++源程序缓冲区溢出漏洞的静态检测

讨论了C/C++源程序中缓冲区溢出的常见表现;分析了其特性以及产生机理;提出了在源代码的AST上附加安全属性进行漏洞静态检测的方法;讨论了该方法的实现过程。     

使用抽象语法树匹配分析Java程序演化

软件在生命周期中一直在发生演化,对软件演化的分析可以揭示软件发展的一些基本规律。现有方法通常使用改变的代码行数作为软件演化的指标,但是这项指标不能反映软件架构的变化,也不能帮助理解软件演化的具体情况。使用抽象语法树匹配ATS(Abstract Syntax Tree)进行代码分析能够更清楚地了解软件中发生改变的具体内容。针对Java语言编写的软件,可以了解静态域的添加、删除和类型修改;类的添加、删除、类型修改和方法体修改。这些信息能更好地帮助理解软件演化。     

位归约识别的研究与实现

尽管归约识别及并行化技术已经不是一个新的技术,但现有的并行化编译器的归约识别功能还不能满足实际应用的需要。通过对归约操作识别及并行化的分析和研究,在SUIF的基础架构上通过修改中间表示语言,实现了对位归约操作的识别功能。     

基于RBI的海上储罐检维修优化

结合海上储罐检测的特点,将RBI(基于风险的检测计划)方法和结构分析结合起来,从腐蚀过程模拟及结构应力模拟两方面出发提出海上储罐检测计划的优化方式.     

白酒对果蝇及小鼠氧化损伤的影响

探讨名优白酒对果蝇和小鼠抗氧化指标及小鼠血清谷草转氨酶(AST)与谷丙转氨酶(ALT)的影响.结果显示,样品酒5%、15%组,肝组织中谷胱甘肽过氧化物酶(GSH-Px)酶活力高于酒精对照组和模型组,差异有统计学意K(P＜0.05).各剂量组羰基蛋白含量较空白组显著升高(P＜0.05).5%样品组AST含量与空白组比较差异无统计学意义,而15%、30%和60%样品组以及30%酒精组与空白组比较AST都明显升高,差异有显著性.30%酒精组较空白组ALT含量高,差异有统计学意义.样品组与空白比较无显著性差异.果蝇酒精对照超氧化物歧化酶(SOD)、GSH-Px含量较空白及低剂量样品白酒低,差异有统计学意K(P＜0.05).高荆量(1%,v/v)与酒精对照无显著性差异.表明低剂量的样品白酒可增强小鼠及果蝇的抗氧化能力,而高剂量则促进其氧化损伤.     

Effect of tea polyphenol on oxidative injury in s180 cells induced hepatocarcinoma mice

The purpose of this study was to evaluate the antioxidant nature of tea polyphenol on S180 cells induced liver cancer in mice. In the present study, hepatocellular carcinoma was induced by tumor transplantation of liver in situ. The antitumor activity of tea polyphenol has been determined in vivo in hepatocellular carcinoma mice after treatment of drug (50, 100, 150 mg/kg body weight) by gavage for 20 days. Results showed that a significant increase in serum aspartate transaminase (AST), alkaline phosphatase (ALP), alanine aminotransfere (ALT), malondialdehyde (MDA) level, decrease in serum white blood cells (WBC), serum total protein (TP), albumin (ALB), A/G, tumor necrosis factor-α (TNF-α) and interferon-gamma (IFN-γ), liver reduced glutathione (GSH) levels were observed. In addition, the levels of enzymic and non-enzymic antioxidants were decreased when subjected to S180 cells induction. These altered enzyme levels were ameliorated significantly by administration of tea polyphenol at the concentration of 50, 100, 150 mg/kg body weight in drug-treated animals. These results indicate that the protective effect of tea polyphenol was associated with inhibition of MDA induced by S180 cells and to maintain the antioxidant enzyme levels.     

Influence of Preoperative Serum Aspartate Aminotransferase (AST) Level on the Prognosis of Patients with Non-Small Cell Lung Cancer

The purpose of this work is to analyze preoperative serum aspartate aminotransferase (AST) levels and their effect on the prognosis of patients with non-small cell lung cancer (NSCLC) after surgical operation. These analyses were performed retrospectively in patients with NSCLC followed by surgery; participants were recruited between January 2004 and January 2008. All clinical information and laboratory results were collected from medical records. We explored the association between preoperative serum AST and recurrence-free survival (RFS), and the overall survival (OS) of NSCLC patients. Kaplan–Meier analysis and Cox multivariate analysis, stratified by the AST median value, were used to evaluate the prognostic effect. A chi-squared test was performed to compare clinical characteristics in different subgroups. A p-value of ≤0.05 was considered to be statistically significant. A total of 231 patients were enrolled. The median RFS and OS were 22 and 59 months, respectively. The AST levels were divided into two groups, using a cut-off value of 19 U/L: High AST (>19 U/L), n = 113 vs. low AST (≤19 U/L), n = 118. Multivariate analysis indicated that preoperative serum AST > 19 U/L (hazard ratio (HR) = 0.685, 95% confidence interval (CI): 0.493–0.994, p = 0.046 for RFS, HR = 0.646, 95% CI: 0.438–0.954, p = 0.028 for OS) was an independent prognostic factor for both RFS and OS. High preoperative serum AST levels may serve as a valuable marker to predict the prognosis of NSCLC after operation.