The Ubiquity Of Crossover

If the word 'crossover' is unfamiliar to you, perhaps it is time to get to grips with this modern phenomenon. It is one of those vague words that one is never quite clear about; how did it start? What exactly does it mean? Crossover seems to have infiltrated our lives without us even noticing.

5G: Vision, Scenarios and Enabling Technologies

This paper presents the authors＇ vision for 5G wireless systems, which are expected to be standardized around 2020 （IMT-2020）. In the future, ubiquitous service will be the key requirement from an end-user＇ s prospective, and 5G networks will need to sup- port a vast mesh of human-to-human, human-to-machine, and machine-to-machine connections. Moreover, 5G will need to support these connections in an energy-efficient manner. Various 5G enabling technologies have been extensively discussed. These tech- nologies aim to increase radio link efficiency, expand operating bandwidths, and increase cell density. With these technologies, 5G systems can accommodate a massive volume of traffic and a massive number of connections, which is fundamental to providing ubiquitous services. Another aspect of 5G technology is the transition to an intelligent cloud that coordinates network access and enables flatter architecture.

Performance Evaluation of IPv4/IPv6 Networks for Ubiquitous Home-Care Service

Abstract--- Because of rapid development in network technology, Internet usage has become widespread. It allows users with sensing devices to obtain medical data for healthcare, such as physiological signals, voice, and video streams from telemedicine systems, and to send the healthcare data to back-end database systems, creating a ubiquitous healthcare environment. However, this environment requires a widespread and suitable network. IPv6 （Internet protocol version 6） is the next-generation Internet protocol that will be the protocol of future networks; it improves many shortcomings of IPv4. In this paper, we propose an IPv6/IPv4 U-home-care test system and analyze the network＇s parameters though a series of tests by adjusting network parameters to find the optimal design for applications in the IPv6/IPv4 U-home-care service so as to assure good performance and high quality.

Experience-Based Access Control in UbiComp: A New Paradigm

Experience is a sociological concept and builds over time. In a broader sense, the human-centered equivalents of experience and trust apply to D2D interaction. Ubiquitous computing (UbiComp) embeds intelligence and computing capabilities in everyday objects to make them effectively communicate, share resources, and perform useful tasks. The safety of resources is a serious problem. As a result, authorization and access control in UbiComp is a significant challenge. Our work presents experience as an outcome of history (HI), reliability (RL), transitivity (TR), and Ubiquity (UB). This experience model is easily adaptable to a variety of self-regulating context-aware access control systems. This paper proposes a framework for Experience-Based Access Control (EX-BAC) with all major services provided by the model. EX-BAC extends attribute-based access control. It uses logical device type and experience as context parameters for policy design. When compared with the state-of-the-art, EX-BAC is efficient with respect to response time.

诺基亚消息

与Ubiquity公司共同进入丰富多媒体市场；为中国TOM在线提供媒体影音中心技术。

Biogeographic patterns of the myxomycete biota of the Americas using a parsimony analysis of endemicity

Myxomycetes are microorganisms frequently considered to be of cosmopolitan distribution,however as studies in unexplored areas have intensified,more information has become available on the patterns of distribution of these organisms,but no historical or cladistic biogeographic approaches have been applied to understand such patterns.In this study a parsimony analysis of endemicity(PAE)was used in order to generate a preliminary hypothesis on the biogeographic relationships of 13 American areas in which a well-known myxomycete biota exists.In general terms the hypotheses of the relationship between the myxomycete assemblages of areas used in this study agree with those reported for other groups of organisms.They appear to show that a historical-geographic pattern influences the distribution of myxomycetes as much as environmental factors.Three main clades were found in the analysis,with the first one including the two subantarctic localities,the second one representing the South American transition zone and the last one including all the Neotropical and Nearctic areas,but arranged into two subclades,one with the arid areas and the other with the tropical and temperate humid areas.Each clade or subclade in the cladogram is supported by the presence of several morphospecies,some of which appear to represent endemic species restricted to specific geographic areas.The results of this analysis are proposed as a working hypothesis that can perhaps be supported in the future with new data from other complementary regions of America or with more intense surveys in the areas already explored.They are inconsistent with the hypothesis of cosmopolitan distribution for these microorganisms,as they appear to indicate groups of species that are restricted to certain geographic areas,some of which may be endemic,such as those from the subantarctic forests of South America,those found exclusively in the South American arid areas or those that have been recently described from arid areas of North America.

Transfer and migration of polycyclic aromatic hydrocarbons in soil irrigated with long-term wastewater

In order to investigate the transfer and migration behavior of polycyclic aromatic hydrocarbons(PAHs)in soil with long-term wastewater irrigation,Groundwater Ubiquity Score(GUS)and fugacity method were respectively used to assess the potential entry into the groundwater and transfer capacity of PAHs.The results of assessment using GUS show that there is significant correlation between the GUS and organic carbon sorption coefficient(KOC)for PAHs and a simple assessment method with KOC was referred to evaluate contamination of groundwater.Applying fugacity method,evaluation results of transfer and migration of PAHs in soil suggest that the PAHs accumulation in the soil through long-term wastewater irrigation could be re-volatilized as secondary emission sources to atmosphere for the Low Molecular Weight(LMW)PAHs,in contrast to High Molecular Weight(HMW)PAHs for which the soil remains a sink that could absorb more PAHs.The net volatilisation flux was 0.39 g/d in upland and 0.32 g/d in paddy for LMW Nap(Naphthalene),and 0.97×10^(-3)g/d in upland and 0.37×10^(-3)g/d in paddy for LMW Phe(Phenanthrene).The net deposition was 0.72×10^(-4)g/d in upland and 0.10×10^(-3)g/d in paddy for HMW Fla(Fluoranthene),and 0.22×10^(-4)g/d in upland and 0.20×10^(-4)g/d in paddy for HMW Bap(Benzo[a]pyrene).Sensitivities of the model estimates to input parameters were tested,and the sensitivity coefficient was defined for the test.The most influential parameters were the volumes of the air,water,and organic carbon fractions in soil and the thickness of the soil.