大学英语网络自主学习“334”多元同步评价体系研究

大学英语网络自主学习特定的教学模式,要求有特定的评价体系加以监控以保证其学习效果。建构主义和多元智能理论的学习观和评价观为网络自主学习的多元同步评价体系提供了有力的理论支撑。形成性评价和终结性评价相结合的"334"多元同步评价体系能够促进学生个性发展和自主学习能力的提高。

“课题式管理”研究性学习评价的研究与实践

“课题式管理”研究性学习评价，即评价与学习过程同步进行的评价方法，关注研究项目设计、实验过程、交流研讨、合作意识、学习态度、实验报告等方面，运用多变量增广混合逐步回归非线性数学模型，分析研究性学习各因素与学生发展的相关性，确定评价指标。开展开题评价、中期评价和结题评价，评价方式多元化，包括档案袋评价、作品展示、答辩会等，使学生在评价中提高研究性学习水平，促进自主学习、合作学习、探究学习的开展。

A randomized controlled trial of two chemotherapy regimens-paclitaxel liposome combined with platinum and paclitaxel combined with platinum in concurrent chemoradiotherapy for cervical carcinoma

Objective:The aim of the study was to compare the efficacy,side effect and influence on the survival rate of two chemotherapy regimens,paclitaxel liposome combined with platinum and paclitaxel combined with platinum,in concurrent chemoradiotherapy for cervical carcinoma.Methods:The 162 cases with primary cervical carcinoma diagnosed between January 2008 and November 2009 in Jiangxi Maternal and Child Health Hospital(China) were enrolled in this randomized controlled trial.Seventy-one cases were included in paclitaxel group and 91 in paclitaxel liposome group.And the chemotherapy doses were as follows:paclitaxel liposome and paclitaxel 135 mg/m2;cisplatin 80 mg/m2 or carboplatin AUC 4-6;then repeated every 21 days for two or three times.Radical radiotherapy was given to both groups at the same time.Efficacy was evaluated according to the tumor regression six months later and follow-up was done consistently.Results:The overall response rates of paclitaxel group and paclitaxel liposome group were 90.1% and 89 % respectively(P > 0.05).The one year cumulative survival was 91.4% for paclitaxel group and 89.2% for paclitaxel liposome group(P > 0.05).The incidence rates of adverse effects such as rash,gastrointestinal toxicity,bone marrow suppression and muscle/joint pain in paclitaxel liposome group were much lower than those in paclitaxel group(P < 0.05),while there was no difference regarding hair loss,hepatic function damage,peripheral neuritis and other aspects(P > 0.05).Conclusion:Paclitaxel liposome plus platinum is a safe and effective method for staging IIa-IV cervical carcinomas.While the long-term efficacy should be further observed.

Does it make sense evaluating cardiac resynchronization therapy in the elderly regardless of the type of the device？

We read the research article entitled Is cardiac resyn- chronisation therapy feasible, safe and beneficial in the very elderly？ with great interest. The authors emphasized that despite the average age of heart failure was 77 years in the general population of UK,patients receiving cardiac re- synchronisation therapy [with pacemaker alone （CRT-P） or with additional defibrillator capabilities （CRT-D）] were on younger ages at 72 and 67 years respectively. In the lights of this data, we agree with the authors that CRT seems to be undemtilized in the elderly patients with heart failure.

Cooperative DVB-SH Satellite Broadcasting Systems with Rotated Signal Constellations

In this paper,we study the advantages of cooperation in broadcasting systems from a geosynchronous earth orbit(GEO)satellite to mobile terminals(MTs),achieved through a terrestrial complementary ground station(CGS) with fixed installment,which acts as a relay.Moreover and in the context of the digital video broadcasting-satellite-to-handheld(DVB-SH) standard,the performance improvements offered by the rotated constellations method are investigated,where prior transmission,a phase rotation of the transmitted symbols by a fixed angle is applied followed by a random component interleaver.Turbo codes with soft decision decoding and appropriate random channel interleavers are also considered.We present analytical expressions for the bit log-likelihood ratios(LLRs)that are needed for soft decision decoding at the MT turbo decoder,while the code combining technique is adapted to improve the end-to-end(E2E) performance.Then,we obtain through extensive computer simulations the average bit error probability(ABEP) of quadrature phase-shift keying(QPSK) signals received over pure land-mobile satellite(LMS)and pure CGS links for coding rates 1/3 and6/7.Moreover,the optimal rotation angles are obtained for both links.E2 E ABEP results are then presented assuming cooperation between GEO and CGS,while the power allocation issue is investigated under fixed total transmission power.Our performance evaluation results show that by using the constellation rotation technique,a performance gain can be achieved for high coding rates.

应用于多组分中药制剂释药评价的基于数学集合的释放动力学评价方法与Kalman滤波法的比较研究

目的:提供一种评价多组分中药的基于数学集合的释药动力学方法。方法:以扶正化瘀方为研究模型,通过建立的基于数学集合的释放动力学评价方法指导扶正化瘀复方释药系统的制备,对其多组分释放特征进行量化评价,并采用Kalman滤波法验证方法的准确性。结果:两者比较结果均表明,扶正化瘀复方释药系统样本4与参比制剂扶正化瘀胶囊显示出释药同步。结论:此结果不仅验证了基于集合的方法的准确性和合理性,而且通过异步系数参数整体表征目标制剂的释放情况,并能从各特征峰信息的相对误差参数中找到释药单元剂量调整改进的方向,指导相关成分有目的性地调整,以使目标制剂满足与参比制剂释药同步性的要求,同时为多组分中药复方制剂的定量表征和评价中药多组分释放行为的同步性提供一种行之有效的评价手段。