带拥塞控制的多预约MAC协议

针对802.11协议,在数据接入过程中,缺少为高优先级数据流提供充分保护机制的问题,提出了一种带拥塞控制的多预约的MAC协议。在接入过程中,该协议采用多预约机制确保高优先级数据流的接入成功概率,在中间节点通过接入控制,以一定的概率拒绝低优先级数据流的接入请求,保护转发节点避免拥塞。仿真结果表明,该方法有效地保护了高优先级流的端到端吞吐量、时延和丢弃率。     

How Kids Learn to Say the Darnedest Things: The Effect of Multiple Exemplar Instruction on the Emergence of Novel Verb Usage

We report experiments using time-lagged pre- and postintervention designs with (a) 4 first graders with learning delays, and (b) a systematic replication with 3 preschoolers with learning delays. Both experiments tested the effects of multiple exemplar instructional procedures (MEI) on the emergence of untaught past tense emission of novel regular verbs (e.g., jumped derived from jump) and grammatically inaccurate but experimentally correct usage of irregular verbs (e.g., singed derived from sing). Prior to the MEI, none of the children could produce regular or irregular past tense forms to pictures that provided simulated contexts (pictures with backgrounds for past and present tense). MEI provided across the picture contexts for past and present tense used separate training sets of verbs to teach children to form regular past tense. After either 1 or 2 MEI training sets, the children emitted accurate past tense forms of the untaught regular and inaccurate, but experimentally correct irregular verbs. These findings provided an instructional history that resulted in the children''s acquisition of past tense for untaught regular past tense verbs and “creative” errors with irregular tenses. Results are discussed in terms of the research on experimentally induced sources for novel verbal behavior and related interpretations.     

城市草坪的多元功能与大众养护

文章用生态学理论和人文观点,揭示出城市草坪的环保功能,文化营养功能和健身功能,对城市草坪管理和使用的现状提出了可行性改进意见。     

拿来与创新——中日多元文化教育问题的比较

中国和日本的多元文化教育由来已久 ,虽然各有特色 ,但仍有共同的特征。两国的多元文化教育对不同文化不只是模仿、吸纳 ,而且还进行有机的融合、发展 ,是“拿来”与“创新”的结合 ,从中我们可以得到颇多启示。     

空间无线光CDMA网络的探讨

通过对自由空通信中的多址环境空间无线光通信的强背景噪声等特点的分析以及对多种多址方式的对经，综合讨论自由空间无线光通信中采用码分多址技术的可行性、优越性和技术难点在此基础上，提出了码多址和空分多址相结合的方案以及ＣＤＭＡ的系统模型     

Kruskal–Wallis, Multiple Comparisons and Efron Dice

The Kruskal–Wallis test is a rank–based one way ANOVA. Its test statistic is shown here to be a quadratic form among the Mann–Whitney or Kendall tau concordance measures between pairs of treatments. But the full set of such concordance measures has more degrees of freedom than the Kruskal–Wallis test uses, and the independent surplus is attributable to circularity, or non–transitive effects. The meaning of circularity is well illustrated by Efron dice. The cases of k = 3, 4 treatments are analysed thoroughly in this paper, which also shows how the full sum of squares among all concordance measures can be decomposed into uncorrelated transitive and non–transitive circularity effects. A multiple comparisons procedure based on patterns of transitive orderings among treatments is implemented. The testing of circularities involves non–standard asymptotic distributions. The asymptotic theory is deferred, but Monte Carlo permutation tests are easy to implement.     

企业生产岗位多层次模糊综合评判法

从岗位评价的模糊性入手,对模糊综合评判法及其在岗位评价中的应用进行分析和讨论,将定性分析和定量分析相结合,可提供一种更科学、更简单易行的岗位评价的量化方法.     

贵州六洞地区侗族民间音乐曲式分析

六洞侗族音乐的突出特点是复调音乐,它以羽调为主调,形成抒情优美的羽调式色彩。旋律分二至三条同时进行,而每一条又具有相对的独立性,此起彼伏,时分时合,在起承转合的过程中形成了支声复调色彩。六洞的侗族大歌是由混合节拍组成的支声复调曲式结构;其山歌则是由散拍子构成的五句式结构;其琵琶歌有明显的和声色彩;而其曲艺和戏曲则属上下句型的曲式结构。     

限距组合计数的一些结果

章研究了一些限距组合，利用集合元素的对称性，构造生成函数等计数技巧，提出了有限距组合，倍限距组合及环状限距组合的一系列计数公式．     

经济主体多元化与党的执政能力建设

市场经济主体多元化的发展,在促进经济社会发展的同时,也产生了多方面的影响:执政党的经济基础变得复杂了,经济主体的权利意识增强了,对法治的需求更加迫切了,也使一些人对党的理想与信念的认同度降低了。基于此,要加强党的执政能力建设,就必须扩大和加强党的执政基础,树立科学的执政理念,珍惜与丰富党的执政资源,有针对性地对多元经济主体进行理想与信念教育。