IPv6应用策略研究

IPv6的地址容量大大拓展,报头格式大大简化,能够保证网络层端到端通信的完整性机密性等特点,为其广泛应用奠定了基础。但从IPv4向IPv6转化中仍存在许多问题,如成本较高、支持系统不充分、安全产品开发落后等,为此应采取市场驱动、降低门槛、政策推动等策略,促进IPv6的推广与应用。     

IPv6可用带宽测量方法的设计与实现

提出一种与现有带宽测量方法(包对法)不同的探测理论——基于链路状态的带宽测量方法。源端向目的端发送一系列小的探测报文,通过对探测报文的时延参数进行数理统计得到链路忙闲状态,进而获得链路可用带宽。采用此方法也可用于计算各种链路容量和链路空闲率。在实际测量中为解决探测报文与背景业务之间的相互影响,利用IPv6基本报头中流标签和业务类型字段设计专门的测试流和测试级。仿真证明方法正确。     

大学英语四、六级考试改革背景下英语听说教学新途径探

以大学英语四、六级考试改革为切入点，阐述了大学英语四、六级考试改革的新举措及其对大学英语听说教学的影响，分析了目前听说教学的现状，探讨了提高大学生英语听说能力的新教学途径。     

中国房地产预警模型的建立与应用

一、房地产预警研究现状及分析在房地产市场预警方面,目前的理论研究大多局限在建立房地产指标体系方面。发表在国际学术刊物上的唯一文章HuangandWang(2005)也是着重介绍房地产市场预警的指标体系。就国内的研究,张志杰和陈龙乾(2004)总结了我国学术界的现有研究成果:陈健容提出我国房地产监测体系应包含宏观监测与微观监测,梁运斌给出了将房地产业预警预报系统分为景气分析系统、预警信号系统、行业监测系统和景气调查系统四个部分的构想,丁立宏提出我国的房地产市场监测指标体系应包括房地产景气指标体系与房地产预警指标体系,袁贤祯根…     

6-苯乙炔基双二茂铁丙烷Fc-C(CH3)2-F′c-C≡CPh的合成及表征

通过6-乙炔基双二茂铁丙烷与碘化亚铜反应,合成了6-乙炔化亚铜基双二茂铁丙烷中间体,然后将中间体与碘苯反应,合成了一个新的化合物6-苯乙炔基双二茂铁丙烷.利用元素分析,IR,UV-Vis,MS等方法对新化合物进行了表征,并推测出新化合物的组成和结构.     

Detection of glitches and signal reconstruction using Hölder and wavelet analysis

We present a method based on a local regularity analysis for detecting and removing artefact signatures in noisy interferometric signals. Using H6;lder and wavelet transform modulus maxima lines analysis (WTMML) [S. Mallat, W. Hwang, Singularities detection and processing with wavelets, IEEE Transaction on Information Theory 38 (1992) 617–643] in suitably selected regions of the time-scale half-plane, we can estimate the regularity degree of the signal. Glitches that are considered as a discontinuity on the signal show H6;lder component lower than a fixed threshold defined for a continuous signal. After detection and signature removal, the signal is then locally reconstructed using Mallat reconstruction formulae. The method has been tested with Herschel SPIRE FTS proto-flight model calibration observations and shows remarkable results. Optimization of the detection parameters has been performed on the correlation coefficient, the scale domain for H6;lder exponent estimation and reconstruction for SPIRE FTS signals.     

公布四、六级考试单项成绩价值不可低估

自大学四、六级考试实施以来 ,考生拿到的成绩通知单仅为一个总分。许多考试未通过的学生 ,复习时常常眉毛胡子一把抓 ,忙了一学期 ,再考试 ,结果仍然是不及格。针对此情况 ,笔者通过问卷调查 ,运用反拨效应理论对问卷结果进行分析 ,认为四、六级考试公布单项成绩十分必要 ,且价值不小。     

国际史学界对六至九世纪中国东北边疆民族与中央王朝关系史研究述评

国际史学界对我国东北边疆民族史的研究，不论是研究方向的选择，研究热点的转换，还是价值观念的取向。无不深刻受到其国内意识形态和国际政治局势风云变幻的制约和影响，无不带有鲜明的政治烙印。对关系史问题的研究也当然是如此，可谓鱼龙混杂，国际史学界对此问题的研究，无疑为我们从更深的层面上展开相关史实的研究，提供了多角度的借鉴。当然，对待这些研究论著，还需要我们持去粗取精、去伪存真、去邪扶正的科学研究态度。     

"I'LL DIE WITH THE HAMMER IN MY HAND": JOHN HENRYISM AS A PREDICTOR OF HAPPINESS

This paper examines the association between John Henryism - a behavioral predisposition to cope actively with psycho-social environmental stressors - and happiness. On the basis of previous research on aspiration and goal regulation, we predicted that John Henryism would be negatively associated with happiness when controlling for demographic factors and attainment in various domains of life. We tested the prediction in a sample of hypertensive participants (n = 758) drawn from an inner-city, mainly African-American, safety-net hospital in Jefferson County, Alabama. Bivariate analysis revealed no association between John Henryism and attainment in six domains of life: marriage, children, education, employment, income, and health. However, a significant negative association between John Henryism and happiness was found both in bivariate analysis (Spearman’s ρ = -0.335; p < .001) and when controlling for demographic factors and attainment using ordinal logistic regression analysis. There was a significant interaction effect between John Henryism and gender: being male was positively associated with happiness among participants with low John Henryism, but negatively associated with happiness among participants with high John Henryism. While further study would be required in order to establish the extent to which these findings can be generalized as well as their causal underpinnings, the results support the hypothesis that John Henryism is negatively associated with happiness, especially among men, and underscore the limitations of using self-report measures of happiness as proxies for well-being for purposes of public policy.