EV-DO Rev.A在日本风头渐旺将盖过HSDPA

2006年8月31日,NTT DoCoMo开始在日本东京的中心地带提供HSDPA服务,NEC为该服务提供了惟一的一款终端,支持最高可达3.6Mbit/s的数据下载,这一速度10倍于以前FOMA手机可支持的速度。NTT DoCoMo的用户使用HSDPA服务,不需要支付额外的费用。这一举措使原本已经非常激烈的日本三大移动运营商之间的竞争又步入了一个新阶段。KDDI对此做出回应,宣布将在今年12月份推出世界上第一个商用的EV-DO Rev.A服务,KDDI目前已经推出了两款支持该服务的终端。K DDI过去所取得的成功在很大程度上归功于其采用了CDMA,这使得KDDI有效地将…     

Estimating the costs of occupational injury in the United States

This article estimates workplace injury costs in the U.S. These costs have been studied in less detail than most injury costs. Our methods, which mostly use regularly published data, produce order-of-magnitude estimates. Overall, workplace injuries cost the U.S. an estimated $140 billion annually. This estimate includes $17 billion in medical and emergency services, $60 billion in lost productivity, $5 billion in insurance costs, and $62 billion in lost quality of life. One sixth of the societal costs result from the 3% of workplace injuries in motor vehicle crashes. Motor vehicle costs per injury are almost 6 times the workplace injury average.     

Shell-element formulations in LS-DYNA3D: their use in the modelling of sheet-metal forming

Recent developments in finite-element (FE) analysis include the generation of an increasing number of element formulations. With the burgeoning use of FE simulations for sheet-metal forming, these elements are being applied to finite-strain problems.

This paper examines the cost-benefit relationship of the seven four-noded shell elements currently included in the LS-DYNA3D element library for sheet-metal forming. In order to assess the relative merits of the shell formulations, the Numisheet 93 square benchmark problem was solved using each of the shell formulations. Strain predictions, drawing force, and the relative cpu times are presented. Conclusions are drawn about the cpu cost-effectiveness of the available shell elements.     

Healthy endings. A collaborative health promotion project for the elderly

This article describes a collaborative health promotion project between a graduate nursing program at a state university and a small community hospital. The Healthy Endings program provided health promotion education to groups of older adults at a local senior center. Health promotion in this population is vital to prevent complications and decrease risks that affect quality of life. Health promotion programs were designed to be accomplished through three major components: education, health screenings/services, and the referral process. Specific project objectives focused on safety, sensory deprivation, exercise, screening, compliance with medications, and a variety of psychosocial issues. Graduate nursing students functioning proactively in a senior center on a consistent basis were viewed as valuable by both members and staff.     

A logit model for predicting wetland location using ASTER and GIS

Data from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) were used to develop a logistic regression model to predict the location of wetlands in the Coastal Plain of Virginia. We used the first five bands from two ASTER scenes (spanning 0.52–2.18 µm) covering the same area, acquired 6 March 2005 and 16 October 2005. March Band 3 contributed the most in discriminating wetlands over the other ASTER bands (marginal effect = 7.277), and it predicted the location of 60% of the total wetlands. We used a canonical discriminant analysis to test the significance of GIS variables in separating wetlands from uplands. Soil Survey Geographic Database soil data had the highest correlation with the first canonical component (0.876), followed by March Band 3 (?0.803), and the National Hydrography Dataset water (0.725). We included GIS data layers into the logit model. The resulting model predicted the location of over 78% of total wetlands, highlighting the potential of models incorporating ASTER data for speeding the wetland mapping process, lowering costs of map production, and improving wetland mapping accuracy.     

Standards for Broadband Customer Premises Equipment

This paper summarises key BT standards activities in the area of broadband customer premises equipment (CPE), in particular set-top boxes and in-home networking. The paper firstly describes activities in the Digital Video Broadcasting (DVB) Forum on middleware, IP infrastructure, copy protection and in-home wireless networks. It then goes on to despict the CPE activities in the Full-Service VDSL Forum, which is establishing an end-to-end multiservice video delivery platform. These standards will help to drive a range of CPE devices, capable of being connected to BT's broadband networks.     

Moisture permeability measurements under varying barometric pressure

The development of theories to describe combined heat and moisture transport through porous media has been the subject of a large volume of research over recent years. These theories are important for many areas of study including the investigation of the hygrothermal performance of building envelopes. This paper highlights the difficulties of obtaining separate values for the material vapour and liquid transfer coefficients, a knowledge of which is essential if combined heat and mass transport models are to be accurately solved. The determination of these individual coefficients is not possible using existing measurement methods which enable only a total moisture permeability to be measured with the liquid and vapour flux components combined. The possibility of carrying out measurements under varying barometric pressures to obtain this data is investigated and experimental results using particle board as a test material are reported and compared with results from a previously developed analytical approach. L'elaboration de theories permettant de decrire les transferts combines thermiques et d'humidite a travers des supports poreux a fait l'objet d'un grand nombre de recherches au fil des annees. Ces theories sont importantes pour de nombreux domaines d'etudes, notamment dans la recherche sur la tenue hygrothermique des enveloppes de construction. Ce document met en lumiere les difficultes a obtenir des valeurs independantes pour les coefficients de transfert de vapeur et de liquide dans les materiaux, dont la connaissance est essentielle, si l'on doit definir avec precision la combinaison des modeles de transfert de matiere et de transfert thermique. La determination de ces differents coefficients n'est pas possible avec les methodes de mesure actuellement disponibles, qui permettent seulement la mesure totale de la permeabilite de l'humidite avec la combinaison des elements de flux de vapeur et de liquide. On etudie la possibilite d'effectuer des mesures sous des pressions barometriques variables pour obtenir ces donnees et on enregistre les resultats en utilisant un panneau d'agglomere comme materiau d'essai, ces resultats etant compares a ceux extraits d'une precedente analyse.