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2019年10月16日 22:13:31    日报  参与评论()人

厦门塑美极厦门做埋线双眼皮价格多少4G hype: Time for a reality check By Stephanie N. Mehta Wireless carriers tout a new wave of wireless technology but it will be years before most consumers benefit — and before carriers make money. Verizon Wireless, a joint venture of Verizon (VZ) and Vodafone (VOD), last week announced it had completed data "calls" using its flavor of so-called 4G technology, a new generation of radio upgrades that promises to improve the throughput and capacity of wireless phone networks. Rival Sprint Nextel (S) immediately responded with a flurry of news releases touting its 4G network, which uses a competing technical standard. In proclaiming its ability to deliver peak downlink speeds of 10 Mbps, one release gushed: "At these speeds, Sprint 4G breathes new life into wireless Internet." Um, wasn't that what 3G was supposed to do? Okay, that was a little harsh. But some analysts say the wireless carriers and their suppliers are hyping 4G technologies way before the services –and devices–are y for prime time. Indeed, many carriers globally still are building out their third-generation networks, and are only now starting to see returns on their investments, which included substantial payments for additional spectrum licenses. 3G all over again? "Yay, Verizon made a test call on LTE," deadpans Jane Zweig, CEO of the Shosteck Group, a telecommunications consulting firm. LTE stands for Long Term Evolution, and it is the technology Verizon and many other incumbent phone operators are using to transition to yet another generation of broadband networks. Zweig, whose firm has predicted that global wireless giant Vodafone won't make a return on its 3G investment (including spectrum) until 2013, sees 4G as a replay of 3G: a long, painful slog that will take many years to get up and running–and many more after that to produce financial gains for the carriers. "Let's replay 3G," she says. "Where are the devices? What is it that people are going to do? How much is the build out going cost? What's the resturn on investment. Is this a vendor dream or a carrier's nightmare?" The carriers' 3G experience in the U.S. and abroad certainly offer clues as to how long it will take for 4G to become pervasive (and useful) to consumers. When carriers started rolling out 3G systems in the early part of the decade–Japan's NTT DoCoMo (DCM) in 2001 became the first operator of a 3G network; Verizon followed two years later as the first major carrier in the U.S. to offer 3G–there was a lot of excitement (ample press releases, white papers and briefings by breathless executives) but not a lot for consumers to do with the network. Some road warriors procured wireless data cards to hook their laptops up to the new network, but the first wave of 3G phones didn't offer much of a multimedia experience. If you build it… A few executives at U.S. wireless operators admitted at the time that 3G mainly allowed them to handle high volumes of voice calls at peak times. Not exactly what the futuristic data network was intended for. Along came Apple's (AAPL) iPhone: More than five years after 3G launched in the U.S. consumers finally had a device that showed them the power of mobile broadband networks. (Ironically the first iPhone ran on ATamp;Ts (T) less robust EDGE network, sometimes referred to as a 2.5G network.) Other 3G devices started hitting stores, and today there's a real consumer case for 3G: almost a decade after carriers pledged billions of dollars to acquire wireless spectrum and build out networks. And, still, as Zweig and other analysts point out, 3G coverage in the U.S. remains spotty and service problems persist. Will 4G help? Many operators (and the vendors that hope to sell them expensive new gear) are aly touting 4G as the solution to issues of data overload they are now facing as consumers spend a growing amount of time downloading applications and doing heavy-duty computing on their mobile devices. But as with 3G, fully formed 4G systems–the networks, the devices, the applications–are years away. Telecom executives like to e the 1989 movie Field of Dreams: "If you build it, they will come." They'll come, alright, just not any time soon. /200908/81942福建省厦门市双眼皮哪家医院好 厦门去疤痕正规医院

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南平打一针美白针多少钱 MARS - that#39;s where more than 450 Chinese people want to live.火星- 有450多中国人想住那。They#39;ve applied for one-way tickets to the red planet offered by Mars One, an organization based in the Netherlands hoping to establish a human colony there in 2023.他们已经申请了前往这颗红色星球的单程票,由Mars One提供,一个总部设在荷兰的组织,希望2023年在那建立一个人类定居地。On its website (www.mars-one.com), it says it hasn#39;t yet begun its astronaut selection program, but had so far received in excess of 37,000 applications, including more than 450 from China.在其网站上(www.mars-one.com),它说还没有开始宇航员的选拔程序,但迄今已经收到了超过37000份申请,包括来自中国的450多个。The non-profit organization announced its private spaceflight project in June last year saying that it would send a communications satellite and pathfinder to Mars by 2016 and land four astronauts in 2023 to establish a permanent settlement.这个非营利组织在去年6月公布了私人航天项目,表示到2016年将发送一个通信卫星以及火星探路者到火星,2023年四个宇航员在那登陆以建立一个永久定居地。After that, a new set of four astronauts would arrive every two years.在那之后,每两年四名宇航员组成新的一批将抵达那里。 Mars One is planning a reality TV show where the audience can select the astronauts and watch as they prepare for the epic journey.Mars One正计划一个电视真人秀节目,观众可以选择宇航员并看着他们准备史诗般的旅程。It said it had developed ;a precise, realistic plan based entirely upon existing technologies.;它表示它已经开发出了“一个精确的、现实的完全建立在现有技术基础上的计划”。It said the primary personal attributes of a successful astronaut would be emotional and psychological stability, supported by personal drive and motivation.它说一个成功宇航员的主要个人特质将是情感和心理的稳定,受个人动力和动机所持。;Once on Mars, there is no means to return to Earth. Mars is home,; its website says. ;A grounded, deep sense of purpose will help each astronaut maintain his or her psychological stability and focus as they work together toward a shared and better future.;“一旦上了火星,意味着不再返回地球。火星就是家,”该组织的网站说。“一个稳定深远的目的将帮助每个宇航员保持其心理的稳定,使他们专注于朝着一个共享和更好的未来而一起工作。”It lists five key requirements for applicants - resiliency, adaptability, curiosity, ability to trust, and creativity/resourcefulness.它对申请者列出了五个关键要求——弹性、适应性、好奇心、信任、创造力/足智多谋。Successful candidates will receive a minimum of eight years of training before they leave Earth behind.成功的候选人在他们离开地球之前将接受至少八年的训练。Ma Qiang, a 39-year-old Sichuan Province native, told Beijing Youth Daily he hoped to be selected to make his life ;worth living.;马强,一个39岁的四川人告诉《北京青年报》他希望被选中以使他的生命“值得活下去。”Ma said he survived the 2008 earthquake in the southwest province but had been deeply affected by what he had seen.马强说他经历了2008年在中国西南省份的地震,一直深受他所看到的东西的影响。After that, Ma wanted to do something to make his life worth living, he told the newspaper, and a journey to Mars could be the answer.在那之后,马强想做些事情来让他的生命有价值,他告诉记者,火星之旅可能会是。Wang Wenming, 30, from Kunming in southwest Yunnan Province, said his dream was to explore a new world.王文明,30岁,来自云南昆明,说他的梦想是去探索一个新世界。 /201302/223915漳州激光祛疤厦门哪里有光子嫩肤医院



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