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    • 3. 发明申请
    • RADIOLOCATION IN A WIRELESS NETWORK USING TIME DIFFERENCE OF ARRIVAL
    • 使用时间差异的无线网络中的放射性
    • US20080039119A1
    • 2008-02-14
    • US11874835
    • 2007-10-18
    • Jason CrawfordJohn O'SullivanBrian Hart
    • Jason CrawfordJohn O'SullivanBrian Hart
    • H04Q7/20
    • G01S5/0289G01S5/021
    • A method and an apparatus for radiolocation using time differences of arrival. The method includes receiving transmit timestamps from a set of wireless stations of a wireless network. Each station transmits at least once. The transmit timestamp uses a local timestamping clock to indicate when a station transmitted a packet. The method further includes receiving sets of timestamped captured samples from each station that receives one of the transmitted packets. The times of arrival of each packet at each station are determined from the received sets of timestamped captured samples, and, the relative positions of the stations are determined from the determined times of arrival and the received transmit timestamps. The transmitting by the stations is in a round robin manner one station after the other, and several round robins may be used to mutually calibrate local clocks. Also an apparatus for inclusion in a station of a wireless network. The apparatus includes a buffer subsystem and a timestamping subsystem, such that the station can capture and timestamp a set of samples of a received signal, and send the captured timestamped samples to a processing entity for time difference of arrival location determination.
    • 使用到达时差的无线电定位方法和装置。 该方法包括从无线网络的一组无线站接收发送时间戳。 每个站至少发送一次。 发送时间戳使用本地时间戳来指示电台何时发送数据包。 所述方法还包括从接收所发送的分组之一的每个站接收时间戳捕获的采样集。 从接收到的时间戳捕获采样集合确定每个分组在每个站的到达时间,并且从确定的到达时间和接收到的发送时间戳确定站的相对位置。 台站的发送是一个接一个的循环方式,可以使用几个循环机来相互校准本地时钟。 也是用于包括在无线网络的站中的装置。 该装置包括缓冲子系统和时间戳子系统,使得该站可以捕获并对时间戳进行一个接收信号的采样,并将所捕获的带时间戳的采样发送到处理实体,用于到达位置确定的时差。
    • 7. 发明申请
    • Detecting spam e-mail using similarity calculations
    • 使用相似度计算来检测垃圾邮件
    • US20060149820A1
    • 2006-07-06
    • US11028969
    • 2005-01-04
    • Vadakkedathu RajanMark WegmanRichard SegalJason CrawfordJoel OssherJeffrey Kephart
    • Vadakkedathu RajanMark WegmanRichard SegalJason CrawfordJoel OssherJeffrey Kephart
    • G06F15/16
    • G06Q10/107H04L51/12
    • A method for detecting undesirable e-mails is disclosed. The method includes collecting a plurality of undesirable e-mails, arranging the plurality of undesirable e-mails into a plurality of groups and generating, for each group, at least one token, thereby producing a plurality of tokens for the plurality of undesirable e-mails. The method further includes receiving a first e-mail and generating at least one token for the first e-mail. The method further includes causing a comparison of the at least one token for the first e-mail with at least one of the plurality of tokens for the plurality of undesirable e-mails and identifying the first e-mail as an undesirable e-mail if the at least one token for the first e-mail matches any of the plurality of tokens for the plurality of undesirable e-mails.
    • 公开了一种用于检测不期望的电子邮件的方法。 该方法包括收集多个不期望的电子邮件,将多个不期望的电子邮件排列成多个组,并为每个组生成至少一个令牌,从而为多个不期望的电子邮件产生多个令牌, 邮件 该方法还包括接收第一电子邮件并为第一电子邮件生成至少一个令牌。 该方法还包括:将用于第一电子邮件的至少一个令牌与用于多个不期望的电子邮件的多个令牌中的至少一个进行比较,并将第一电子邮件识别为不期望的电子邮件,如果 所述用于所述第一电子邮件的所述至少一个令牌与所述多个不期望的电子邮件的所述多个令牌中的任一个相匹配。