Maintaining excellence: deliberate practice and elite performance in young and older pianists

Two studies investigated the role of deliberate practice in the maintenance of cognitive-motor skills in expert and accomplished amateur pianists. Older expert and amateur pianists showed the normal pattern of large age-related reductions in standard measures of general processing speed. Performance on music-related tasks showed similar age-graded decline for amateur pianists but not for expert pianists, whose average performance level was only slightly below that of young expert pianists. The degree of maintenance of relevant pianistic skills for older expert pianists was predicted by the amount of deliberate practice during later adulthood. The role of deliberate practice in the active maintenance of superior domain-specific performance in spite of general age-related decline is discussed.     

不断进取的AXE10

有近２０年历史的爱立信ＡＸＥ１０交换机在信息时代到来之际再放异彩，目前，它作为公共平台广泛应用于ＰＳＴＮ、ＩＳＤＮ、ＩＮ，ＰＬＭＮ、信令网和商务通信等。     

风云变幻的德国有线电视市场

德国电信是德国有线电视市场最大的运营商，无力对庞大的网络进行升级改造，欲将其网络出售给海外公司，以便解决自己的债务问题。海外公司之间的竞争以及相关管制机构的干预，导致了市场运作复杂多变的局面。     

Expert performance: Its structure and acquisition.

Counter to the common belief that expert performance reflects innate abilities and capacities, recent research in different domains of expertise has shown that expert performance is predominantly mediated by acquired complex skills and physiological adaptations. For elite performers, supervised practice starts at very young ages and is maintained at high daily levels for more than a decade. The effects of extended deliberate practice are more far-reaching than is commonly believed. Performers can acquire skills that circumvent basic limits on working memory capacity and sequential processing. Deliberate practice can also lead to anatomical changes resulting from adaptations to intense physical activity. The study of expert performance has important implications for our understanding of the structure and limits of human adaptation and optimal learning. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

电信网络管理的望族——TMOS

电信管理及运营支撑是爱立信公司为公用电信网提供的有关管理及运营支撑功能的综合方案，本文介绍了其中的公网管理系统和蜂窝移动网络管理系统。     

A study of sulfur bridges in filled natural rubber vulcanizates by pyrolysis gas chromatography with flame-photometric detection

Natural rubber vulcanizates of two formulations, with sulfur/N-cyclohexyl-2-benzothiazolesulfenamide (CBS) and tetramethylthiuram disulfide (TMTD), respectively, were analyzed by pyrolysis gas chromatography. A sulfur-selective flame-photometric detector was utilized. The main pyrolysis products were identified as CS₂ and some thiophenes. The yields of the pyrolysis products from the two types of rubber were very different. The yields also varied with the curing time of the rubbers.     

Analysis and evaluation of a general camera model

A versatile General Camera Model, GCM, has been developed, and is described in detail. The model is general in the sense that it can capture both fisheye and conventional as well as catadioptric cameras in a unified framework. The camera model includes efficient handling of non-central cameras as well as compensations for decentring distortion. A novel way of analysing radial distortion functions of camera models leads to a straightforward improvement of conventional models with respect to generality, accuracy and simplicity. Different camera models are experimentally compared for two cameras with conventional and fisheye lenses, and the results show that the overall performance is favourable for the GCM.     

ENGINE解决方案与3G

爱立信的ENGINE解决方案采用了3GPP定义的网络架构,与爱立信3G网络解决方案使用统一的业务网络和相同的核心网络,为将来3G的引入、固定网和移动网的融合打下了坚实的基础。1.相同的网络架构ENGINE和3GPP均采用分层的网络结构,即业务层、控制层、承载层和接入层等层面。控制层面中的服务器,通过控制承载层中的边缘节点(Edge)中的媒体网关,为相应的接入网络的用户提供业务支持。根据所支持的终端和业务的不同,分为三种支持系统:固定电话业务域的电话业务软交换系统(TeS)、多媒体业务域的多媒体业务软交换系统BBCS/IMS,以及移动电…     

2G通向3G的成功运营模式

随着3G在全球的发展,GSM网络运营商所面临的任务是快速、经济地建立3G网络,提供多样化的数据服务。但如何平稳地从2G过渡到3G模式,采用何种策略快速、经济地部署和运营3G系统,是当前GSM网络运营商面临的挑战。一、GSM与WCDMA过渡阶段由于市场竞争的压力,许多GSM运营商将会积极地部署WCDMA,推出多媒体移动互联网服务,在未来几年里提供数据服务。GSM运营商将主要经历三个阶段:譹以语音为中心的纯GSM业务;譺全国范围内的GPRS无线数据服务,并在某些地区开展高速WCDMA业务;譻高速多媒体移动互联网WCDMA与GSM业务。各阶段不同…