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LBS的一种隐私保护模型 被引量:3
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作者 唐留朋 夏清国 王黎明 《计算机工程与设计》 CSCD 北大核心 2008年第16期4159-4161,共3页
移动位置服务(LBS)是一个分布式多方参与的系统,给移动商业应用带来了一个快速发展的时机。但由于其拥有访问私人信息的权利,以至于也给它们的用户隐私带来很大的风险。为此,通过对能够有效保护用户隐私的模型进行了研究,提出了一个体... 移动位置服务(LBS)是一个分布式多方参与的系统,给移动商业应用带来了一个快速发展的时机。但由于其拥有访问私人信息的权利,以至于也给它们的用户隐私带来很大的风险。为此,通过对能够有效保护用户隐私的模型进行了研究,提出了一个体系结构和一个协议,协议中使用一个位置中间件把来自LBS供应商提供的用户关心的区域信息和来自移动运营商的用户位置信息进行匹配。结果表明,该协议使得隐私友好的服务成为可能,而且仍然是高效率。 展开更多
关键词 移动位置服务 隐私 连接器 身份管理 位置中间件
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Pioneering Proposal of Floating Type Ocean Wave Power Station 被引量:2
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作者 Shun Okamoto Toshiaki Kanemoto 《Journal of Energy and Power Engineering》 2013年第4期633-638,共6页
This serial research develops the unique ocean wave power station, which is composed of the floating type platform with a pair of the floats arranged at the interval of one wavelength and the counter-rotating type wav... This serial research develops the unique ocean wave power station, which is composed of the floating type platform with a pair of the floats arranged at the interval of one wavelength and the counter-rotating type wave power unit whose runners are submerged in the seawater at the middle position of the platform. Such profiles make the flow velocity through the runners two times faster than that of the traditional fixed/caisson type OWC (oscillating water column), that is, the runners may be able to get the dynamical energy eight times on the ideal. Besides, the runners counter-drive the inner and the outer armatures of the peculiar generator, respectively, and then the relative rotational speed is two times as fast as the speed of the single runner/armature. Such characteristics make the runner diameter large, namely the output higher, as you request, because the rotational moment of the power unit hardly act on the floating type platform. This paper, as the first step, discusses the platform behaviors at the normally oscillating wave. The platform behavior is affected by not only the length and the amplitude of the wave but also the relation between the weight of the platform and the buoyancy force of the floats. 展开更多
关键词 Renewable energy ocean wave FLOAT PLATFORM counter-rotation power unit.
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