基于试验知识的ABS自适应控制策略研究与验证

文中根据大量道路试验获得的知识,在普遍采用的逻辑门限值控制方法的基础上提出了一种能够对不同路面和制动工况具有广泛自适应能力的ABS控制策略。该策略能够根据路面状况对主要控制门限进行自适应调整,并能准确估算参考车速。大量的匹配和实车道路试验表明,基于试验知识的ABS自适应控制策略能够提升控制效果并减少ABS在新车型上的匹配时间。开发完成的液压ABS性能和可靠性满足产业化要求,已在多款SUV和皮卡车上批量装车使用。

从试验知识型人员离职浅谈试验知识管理体系建设

汽车试验是整车开发流程中的重要部分,汽车试验团队中的知识型人员是汽车试验知识资源的重要载体。试验知识型人员离职造成的试验知识流失,愈发成为制约整车研发企业生存与发展的重要问题。本文从试验知识保护的角度出发论述了试验知识管理体系建设的重要性,并就试验知识体系的建立提出了初步的建设方案。

基于语义技术的临床试验系统

临床试验是医学研究及其药物研发的重要内容之一。但是,由于临床试验数据的异构性与复杂性,其处理过程需要大量的人工干预,导致管理与服务的低效率。提出一个基于语义技术的临床试验系统,称为SemanticCT系统,并在LarKC海量语义数据处理平台上实现了该系统。介绍了如何采用SemanticCT系统实现临床试验的语义数据整合及其提供相应的知识管理与服务。

浅谈药物临床试验机构资格认定工作的实践与体会

从机构建设、硬件设施、制度建设、人员培训、模拟认证等方面总结我院在机构资格认定工作的经验和体会。介绍我院开展药物临床试验机构资格认定工作的经验,为同行提供借鉴和参考。

Indomethacin for post-endoscopic retrograde cholangiopancreatography pancreatitis prophylaxis:Is it the magic bullet?

Acute pancreatitis is a common complication of endoscopic retrograde cholangiopancreatography(ERCP).Pancreatic duct stent insertion after ERCP has been widely accepted as the standard of care for the prevention of this complication in high-risk patients.Unfortunately,the placement of pancreatic stents requires higher level of endoscopic expertise and is not always feasible due to anatomic considerations.Therefore,effective non-invasive pharmacologic prophylaxis remains appealing,particularly if it is inexpensive,easily administered,has a low risk side effect profile and is widely available.There have been multiple studies evaluating potential pharmacologic candidates for post-ERCP pancreatitis(PEP) prophylaxis,most of them yielding disappointing results.A recently published large,multicenter,randomized controlled trial reported that in high risk patients a single dose of rectal indomethacin administered immediately after the ERCP significantly decreased the incidence of PEP compare to placebo.

Radiotherapy combined with surgical treatment for gastric cancer:a meta-analysis

Objective:We carried out a meta-analysis to assess the effectiveness and safety of radiotherapy combined with surgery for gastric cancer.Methods:Randomized Clinical Trials (RCTs) in which radiotherapy (preoperative,intraoperative and postoperative),was compared with surgery alone in resectable gastric cancer were identified by searching Cochrane Library (Issue 2,2009),PubMed (Jan 1966-Jun 2009),EMBASE (Jan 1974-Jun 2009),Chinese Biomedical Literature Database (Jan 1978-Jun 2009),Chinese Science and Technology Periodicals Database (Jan 1989-Jun 2009),China National Knowledge Infrastructure (Jan 1994-Jun 2009) and Wanfang database (Jan 1997-Jun 2009) in English and Chinese languang.Two researchers assessed the quality of included randomized controlled trials (RCT) extracted data independently.The RevMan 5.0 software was used for meta-analysis.Our researchers assessed the quality of included randomized controlled trials (RCT) extracted data independently.The RevMan 5.0 software was used for meta-analysis.Results:Nine randomized controlled trials of 1 548 patients were selected for meta-analysis.Five randomized controlled trials were related with comparison of preoperative radiotherapy plus surgery with single surgery.Two randomized controlled trials were the comparative studies between surgery plus postoperative and single surgery.The meta-analysis results showed that:(1) compared with surgery alone,preoperative radiotherapy combined with surgery can increase 3 years (OR=1.78;95% CI 1.14-2.78,P=0.01),5 years (OR=1.67;95% CI 1.22-2.29,P=0.001),10 years (OR=1.64;95% CI 1.03-2.60,P=0.04) survival rate and resection rate (OR=2.15;95% CI 1.31-3.54,P=0.003);reduce the of tumor recurrence rate (OR=0.59;95% CI 0.37-0.92,P=0.02) and metastasis rate (OR=0.44;95% CI 0.27-0.73,P=0.001);(2) The tumor recurrent rates (OR=0.19,95% CI 0.03-1.14,P=0.07) and tumor metastasis rate (OR=0.09;95% CI 0.00-1.77,P=0.11) had no difference between single surgery group and peri-operative radiotherapy plus surgery group;(3) Postoperative radiotherapy compared with surgery alone had no significant effects on 1 year (OR=0.83;95% CI 0.60-1.15,P=0.26) and 3 years (OR=0.75;95% CI 0.51-1.11,P=0.15) survival rate compared with single surgery,but the 5-year survival rates (OR=0.57;95% CI 0.34-0.95,P=0.03) of the patients who received surgery alone was higher than those who received combined therapy.No difference of the tumor recurrence rate (OR=0.59;95% CI 0.33-1.05,P=0.07),tumor metestasis rate (OR=0.90;95% CI 0.51-1.59,P=0.71) and anastomotic leak (OR=0.98;95% CI 0.25-3.65,P=0.98) were observed between the two groups.Conclusion:Preoperative radiotherapy combined surgery is more rational and effective than surgery alone of gastric cancer.However,in terms of the clinical effects of perioperarive or postoperative radoiotherapy combined with surgery,much multicenter,largescale,high-quality,double-blind and rigorously designed studies would be needed than currently available in the future.

Meta-analysis of Traditional Chinese Medicine in treating functional dyspepsia of liver-stomach disharmony syndrome

OBJECTIVE： To systematically assess the clinical ef- fectiveness of traditional Chinese medicine （TCM） in the treatment of functional dyspepsia （FD） of liv- er-stomach disharmony syndrome by meta-analysis. METHODS： Random controlled trials （RCTs） were retrieved from databases, including Pubmed, China national knowledge infrastructure, Wanfang Data, VlP Information, and the Cochrane Library. Trials were selected according to inclusion criteria. The ef- fects of traditional Chinese medicine （TCM） versus prokinetic agents in the treatment of functional dyspepsia （FD） of liver-stomach disharmony syn- drome were compared by meta-analysis. RevMan 5.0.24 was used for data analysis. The effective rate was assessed by odds ratios （ORs）, and 95% confi- dence intervals （C＇/s） were calculated. The cure rate was analyzed by the Peto OR. Simple statistica~ anal- ysis was chosen to assess the frequency of pre- scribed Chinese herbs in treating this syndrome.RESULTS： Thirteen trials were included, involving 1153 patients, and these were of poor methodolog- ical quality. Twelve studies mentioned the effective rate and cure rate. TCM therapy showed a better clinical effect rate compared with that with proki- netic agents [OR： 3.2, 95% CI （2.27, 4.51）]. The TCM group also had a better cure rate than that in the group of prokinetic agents [Peto OR： 2.26, 95% CI （1.61, 3.18）]. With regard to the frequency of Chi- nese herbs used in these 13 trials, Baishao （Radix Paeoniae）, Chaihu （Radix Bupleuri）, and Gancao （Ra- dix Glycyrrhizae） were mostly prescribed, followed by Xiangfu （Rhizoma Cyperi）, Zhishi （Fructus Auran- tii Immaturus）, Zhiqiao （Fructus Aurantii）, Foshou （Citrus medica var.sarcodactylis）, and Chenpi （Peri- carpium Citri Reticulatae）. No serious adverse ef- fects were reported. CONCLUSION： TCM therapy shows a superior effec- tive rate and cure rate compared with those in pro- kinetic agents in the treatment of FD of liver-stom- ach disharmony syndrome. However, further strict- ly designed RCTs are required because of the poor quality of included trials.

Safety and efficacy of Danqipiantan capsule for treatment of stroke: a systematic review

OBJECTIVE： To evaluate the efficacy and safety of Danqipiantan capsule （DPC） for the treatment of stroke. METHODS： PubMed, China Science And Technolo- gy Journal Database, Wanfang Database, Chinese periodicals in the China National Knowledge Infra- structure, and the General Hospital of Tianjin Medi- cal University＇s Library were searched until July 2012. Randomized controlled trials （RCTs） and ob- servational studies that reported the use of DPC for treatment of stroke were selected. RESULTS： Eleven articles that included 12 RCTs, and 2 articles that included 3 observational studies were identified. A total of 2590 patients participat- ed in the studies. We found that there was a signifi-cant statistical difference between DPC treatment groups and the control groups in terms of the effec- tive rate [risk ratio （RR）, 1.14; 95% confidence inter- vals （CI）, 1.04, 1.25; P=0.01], FugI-Meyer Assessment Scale [weighted mean difference （WMD）, 9.77; 95% CI （4.84, 14.70）; P=0.00], Barthel Index [WMD=6.40; 95% CI （3.15, 9.65）], and mean flow velocity [WMD= 5.79; 95% CI （1.64, 9.94）]. There were no significant differences for The National Institutes of Health Stroke Scale [WMD=0.60; 95% CI （ - 1.09, 2.29）], vi- sual field defects [left visual field： WMD= - 203.10; 95% CI （ - 424.41, 18.21）; right visual field： WMD= - 172.60; 95% CI （ - 409.29, 64.09）] or the functional independence measure [WMD= - 7.90; 95% CI （ - 16.64, 0.84）]. Seven articles that included eight RCTs reported the safety of DPC treatment. Two ar- ticles that included three observational studies also reported beneficial effects for DPC. Because the Chinese studies were of poor methodological quali- ty, and most of the sample sizes were small, our analysis was likely affected by bias. CONCLUSION： DPC has a beneficial effect and is relatively safe when used for the treatment of stroke.

Xuefuzhuyu decoction for hyperlipidemia: a systematic review and Meta-analysis of randomized clinical trails

OBJECTIVE:To evaluate the efficacy and safety of Xuefuzhuyu decoction for hyperlipidemia.METHODS:Randomized clinical trials on hyperlipidemia treated by Xuefuzhuyu decoction,either alone or with Western Medicine,were searched in electronic databases.Databases searched were:MEDLINE,Allied and Complementary Medicine Database,EMBASE,The Cochrane Library 2013(Issue4),China National Knowledge Infrastructure Database,Chinese Biomedical Literature Database,and Wanfang Database up to 2 May,2013.Study selection,data extraction,quality assessment,and data analysis were conducted according to the Cochranestandards.RESULTS:Six randomized clinical trials involving748 patients(373 patients in the treatment group,375 patients in the control group)were included in the analysis.The studies were of low methodological quality.Meta-analysis indicated that the effect of Xuefuzhuyu decoction on hyperlipidemia was better than that in the control group[n=748,OR=5.07,95%CI(3.40,7.58),P<0.01].Weighted mean differencesin total cholesterol,low-densitylipoprotein cholesterol,triglycerides,and high-density lipoprotein cholesterol were﹣0.79,﹣0.74,﹣0.44,0.16,respectively,and Meta-analysis revealed that the treatment group was better than the control group with 95%CI(﹣1.21,﹣0.36),(﹣0.94,﹣0.55),(﹣0.77,﹣0.11),(0.04,0.27),respectively(all P<0.05).Some adverse events in evaluated studies wererecorded.CONCLUSION:Xuefuzhuyu decoction may be effective for treating hyperlipidemia.The studies we analyzed were of low methodological quality,which indicates that the above findings should be considered cautiously.Therefore,more strictly designed large-scale randomized clinical trials are needed to evaluate the efficacy of Xuefuzhuyu decoction in hyperlipidemia.

SEQUENTIAL EMPIRICAL BAYESIAN DESIGN FOR SENSITIVITY EXPERIMENTS

Maximum likelihood recursions were used by Wu （1985） to estimate extreme quantiles of a quantal response curve. For certain choices of initial designs, Wu＇s method performs well. In many fields of application, there often exist some different initial designs which are known as the up-and- down designs. Based on the existing data set from such a design, the authors propose three sequential empirical Bayesian designs by quickly and efficiently exploiting the information in the testing data and known knowledge. The improvement obtained by using the new procedures for the estimation of extreme quantiles is substantial.