Joint rate control and scheduling for wireless uplink video streaming

INTRODUCTION Video streaming is becoming one of the major driving forces of next generation wireless networks. For the currently deployed cellular networks, the practical data rates are not enough to support full rate, high quality video applications. As a result, many research efforts have been devoted to adapting video content to reconcile the conflict between the high demand of video quality and the limited wireless communication resources among users. A large body of literature utiliz…     

舞动的心

“鲍勃!鲍勃!”我身旁的女人大声命令着,“告诉她你去年为什么不愿跟那个女人结婚!”桌子对面的鲍勃顺从地粗着嗓子回答：“哦,她呀!那真是糟透了!她对我说,要是想跟她结婚的话,我就再也不能去跳舞了!我就告诉她,‘噢,我想我做不到。’”     

北太平洋巨型章鱼

北太平洋巨型章鱼是170余种巨型章鱼中的一种。人们曾经误把它们看成为海怪,实际上,它们性格平和,并不像古老传说描述的那样会攻击船只。     

复合型人才培养与高校教学质量保障体系的构建

近年来,中国高等教育有了快速发展,普通高校和在校生人数逐年增加。今后一个时期,高等教育的重心将由规模的迅速扩大转到提高教育质量上来,为社会培养出高质量高素质的人才是学校发展的重中之重。本文从高校教学质量保障体系与复合型人才培养的关系,教学质量保障体系的构成及功能等方面对高校教学质量保障体系的构建进行了阐述。     

The etiology of mathematical self-evaluation and mathematics achievement: understanding the relationship using a cross-lagged twin study from age 9 to 12

The genetic and environmental origins of individual differences in mathematical self-evaluation over time and its association with later mathematics achievement were investigated in a UK sample of 2138 twin pairs at ages 9 and 12. Self-evaluation indexed how good children think they are at mathematical activities and how much they like those activities. Mathematics achievement was assessed by teachers based on UK National Curriculum standards. At both ages self-evaluation was approximately 40% heritable, with the rest of the variance explained by non-shared environment. The results also suggested moderate reciprocal associations between self-evaluation and mathematics achievement across time, with earlier self-evaluation predicting later performance and earlier performance predicting later self-evaluation. These cross-lagged relationships were genetically rather than environmentally mediated.     

The comprehension and production of Wh-questions in deaf and hard-of-hearing children

Hearing loss during the critical period for language acquisition restricts spoken language input. This input limitation, in turn, may hamper syntactic development. This study examined the comprehension, production, and repetition of Wh-questions in deaf or hard-of-hearing (DHH) children. The participants were 11 orally trained Hebrew-speaking children aged 9.1-12.4 with moderate-to-profound hearing loss from birth, who consistently used hearing aids or cochlear implants and who had difficulties understanding relative clauses. Experiment 1 tested the comprehension of Wh-questions using a picture selection task, comparing subject with object questions and who- with which-questions; Experiment 2 tested the production of subject and object who-questions using an elicitation task; and Experiment 3 tested the repetition of Wh-questions and other structures derived by Wh-movement. All the DHH participants showed difficulty in the comprehension, production, and repetition of object questions, and their performance was significantly below that of hearing children. In contrast, they repeated embedded sentences without movement well, indicating that their deficit is in syntactic movement rather than embedding or the CP node in the syntactic tree. The results provide additional evidence that DHH children have difficulties with Wh-movement and emphasize that Wh-questions, which are crucial for communication, can be severely impaired in these children.     

Stability in Mother-Child Interactions from Infancy through Adolescence

OBJECTIVE: The current study examines homotypic stability in mother-child interactions, applying similar rating scales of mother-child interactions at 1 and 4.5 years, and heterotypic stability from 1 to 13 years and 4.5 to 13 years, using conceptually similar but not identical rating scales at age 13. DESIGN: We coded videotaped mother-child interactions in 202 families when children were 1, 4.5, and 13 years of age during age-appropriate and developmentally salient structured tasks for relationship quality. RESULTS: Multiple regression analyses controlled for the effects of child birth order and gender as well as maternal age and education. Maternal and dyadic, but not child, mother-child interaction qualities at 1 year significantly predicted similar or equivalent constructs at 4.5 and 13 years. Heterotypic stability from 1 to 13 years was partially or fully mediated by the same constructs at 4.5 years. CONCLUSIONS: Maternal behaviors showed a pattern of homotypic and heterotypic stability, whereas dyadic behaviors were somewhat less stable. Child behaviors showed evidence of both homotypic and heterotypic instability.     

以90后视角写青春之作

我经常收到一些读者投稿,作文前面往往附着自我简介之类的资料,这些文字往往很有灵气,就是家常话也给人一种很亲切的感觉。比如,有个同学爆料她的家庭,说爸爸生意失败,一家人过得很苦,后来爸爸振作精神去跑运输,又出了车祸。妹妹不太听话,吃     

11大周星驰头号接班人 揪出来

周星驰了不得,一个人就能把千千万万男女老少逗得前仰后合稀里哗啦。不过,浩瀚搞笑天地,老是靠一人撑着顶着扛着玩着也实在难为他。偏偏他又喜欢孤身作战,老没下决心培养接班人,将周氏搞笑风采有计划有方向地传播延续下去。我等看在眼里,急在心里,特地为星爷苦心搜罗11位头号接班人,请无厘头掌门人尽早留心考察这些人选,争取在明年此时师徒并肩搞笑,星光DOUBLE灿烂!     

Reporting child abuse: pediatricians' experiences with the child protection system

OBJECTIVE: To explore pediatricians' reluctance to adhere to a legal mandate to report suspected child abuse and to compare their perspectives with those described in other jurisdictions in studies informed by different theories and employing diverse methodologies. METHOD: An anonymous survey questionnaire was distributed to all pediatricians with admitting privileges to B.C. Children's Hospital which has a specialized Child Protection Services Unit. Physicians were asked about their own prior reporting experience and the influence of that experience upon future reporting decisions. They were also asked why they think other physicians might be reluctant to report (N = 26). RESULTS: While respondents were generally positive about their experience in filing a report to Child Protective Services, they were less positive about the dearth of feedback they received and they were undecided as to whether there was a positive outcome to their report. Their perceptions of the reasons colleagues might fail to report emphasized dissatisfaction with CPS, concern with loss of relationship with the child's parents, and a desire to avoid court proceedings. CONCLUSIONS: Physicians' noncompliance or at least dissatisfaction with their child abuse reporting mandate is an international problem that can not be addressed by institutional protocols alone. Confusions about the limitations on confidentiality and information sharing might be better addressed through more shared training and opportunities for collaboration than by legal mandates and institutional protocols alone. Organizational theory and exchange theory might inform future research about the conditions under which collaboration is enhanced in the service of protecting children.