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    Energy harvester and wireless sensor device having energy harvester
    33.
    发明授权
    Energy harvester and wireless sensor device having energy harvester 有权

    公开(公告)号：US10046779B2

    公开(公告)日：2018-08-14

    申请号：US15430665

    申请日：2017-02-13

    Applicant: Korea Railroad Research Institute

    Inventor： Jaehoon Kim

    IPC: G06F7/00 ,  B61L15/00 ,  H02K7/18 ,  H02N2/18 ,  H02K35/02 ,  B61K9/00 ,  B61L27/00 ,  G01M17/08 ,  G01D5/02

    Abstract: A wireless sensor device includes: an energy harvester configured to convert vibration generated from a broadband vibration source into electricity, an elastic member arranged to receive the vibration and a communication unit fixed by the elastic member, supplied with the converted electricity from the energy harvester, and configured to transmit sensing information obtained by sensing a measurement target. The elastic member operates as a mechanical filter configured to limit a frequency range and an acceleration magnitude of the vibration to be transferred to the communication unit for stabilizing the performance of the communication unit, and the communication unit is arranged to receive vibration passing through the elastic member.

    Orientation control device for magnetic fluid and method for same
    36.
    发明授权
    Orientation control device for magnetic fluid and method for same 有权

    公开(公告)号：US09698663B2

    公开(公告)日：2017-07-04

    申请号：US14426719

    申请日：2013-04-13

    Applicant: KOREA RAILROAD RESEARCH INSTITUTE

    Inventor： Woo Tae Jeong ,  Duck Shin Park ,  Soon Bark Kwon

    IPC: H02K44/00 ,  F01D1/00 ,  H02K7/18

    CPC classification number: H02K44/00 ,  F01D1/00 ,  H02K7/18

    Abstract: Provided is an orientation control device for a magnetic fluid, includes: a magnetic fluid having magnetic nanoparticles; an induction power generation unit configured to include a silicone tube through which the magnetic fluid passes and a solenoid coil which is wound around a predetermined section outside the silicone tube to generate induced power when the magnetic fluid passes through an inner side of the silicone tube; and a magnetic pole direction control unit configured to include a silicone tube at an entrance portion of the induction power generation unit and a solenoid coil wound around a predetermined section outside the silicone tube and generating a flux when a current flows therein so as to control pole orientation of the magnetic fluid.

    APPARATUS AND METHOD FOR CONTROLLING PTT SERVICE BY MULTIPLEXING CALL ORIGINATOR AND FLOOR ARBITRATOR
    38.
    发明申请
    APPARATUS AND METHOD FOR CONTROLLING PTT SERVICE BY MULTIPLEXING CALL ORIGINATOR AND FLOOR ARBITRATOR 审中-公开
    通过多路复用呼叫器和地面仲裁器控制PTT服务的装置和方法

    公开(公告)号：US20170048894A1

    公开(公告)日：2017-02-16

    申请号：US15234997

    申请日：2016-08-11

    Applicant: Korea Railroad Research Institute

    Inventor： Sang Won CHOI ,  Ju Yeop KIM ,  Yong Soo SONG ,  Yong Kyu KIM

    IPC: H04W76/00 ,  H04W4/08 ,  H04W4/10

    CPC classification number: H04W76/45 ,  H04W4/08 ,  H04W4/10 ,  H04W76/50

    Abstract: A method of Mission Critical Push to Talk (MCPTT) service performed by a mobile terminal includes: generating, at the mobile terminal, a group call announcement for off-network Mission Critical Push to Talk (MCPTT) service, the group call announcement for off-network MCPTT service including information of a period of the group call announcement for off-network MCPTT service; controlling a transceiver to periodically transmit, to one or more mobile terminals, the group call announcement for off-network MCPTT service based on the period; in response to the transmitted group call announcement for off-network MCPTT service, receiving a response from the one or more mobile terminals; and establishing, based on the response from the one or more mobile terminals, a group call with the one or more mobile terminals by setting a direct wireless communication with the one or more mobile terminals.

    Abstract translation: 由移动终端执行的关键任务通信（MCPTT）服务的方法包括：在移动终端处生成用于离网任务关键一键通（MCPTT）服务的群组通话通知，组呼呼叫关闭 网络MCPTT服务，包括网络外MCPTT服务的群组通话周期信息; 基于该周期，控制收发器周期性地向一个或多个移动终端发送用于离网网络MCPTT服务的群呼通知; 响应于所发送的用于离网MCPTT服务的组呼通知，接收来自所述一个或多个移动终端的响应; 以及基于来自所述一个或多个移动终端的响应，通过设置与所述一个或多个移动终端的直接无线通信来建立与所述一个或多个移动终端的群组呼叫。

    SYSTEM AND METHOD FOR RETRANSMITTING RECEIVED DATA USING INDEX CODING AND STATISTICAL CHARACTERISTICS
    39.
    发明申请
    SYSTEM AND METHOD FOR RETRANSMITTING RECEIVED DATA USING INDEX CODING AND STATISTICAL CHARACTERISTICS 有权
    使用索引编码和统计特性重新获取数据的系统和方法

    公开(公告)号：US20160365951A1

    公开(公告)日：2016-12-15

    申请号：US15072982

    申请日：2016-03-17

    Applicant: KOREA RAILROAD RESEARCH INSTITUTE

    Inventor： Sang Won CHOI ,  Ju Yeop KIM ,  Yong Soo SONG ,  Yong Gyu KIM

    IPC: H04L1/08 ,  H04L1/16

    CPC classification number: H04L1/08 ,  H04L1/1607 ,  H04L1/1829 ,  H04L1/1867

    Abstract: Provided is a method for retransmitting received data using index coding and statistical characteristics in a method for transmitting packets, by a transmitter, to at least two receivers in a wireless communication network and retransmitting packets which are not received correctly by each receiver, wherein the transmitter receives a reception acknowledgement response signal for the packets transmitted to the receiver and analyzes received patterns of the reception acknowledgement response signals transmitted from the receiver to differently perform index coding for each received pattern on the packets which are not received correctly by the receiver and retransmit the index-coded packets. According to the exemplary embodiment of the present invention, it is possible to effectively reduce a retransmission frequency of the packets which are not received correctly and a channel use frequency on communications and effectively use limited radio resources.

    Abstract translation: 提供了一种用于在由无线通信网络中的发射机向至少两个接收机发送分组的方法中的索引编码和统计特性的接收数据的重传方法，并且重传未被每个接收机正确接收到的分组，其中发射机 接收发送到接收机的分组的接收确认响应信号，并且分析从接收机发送的接收确认响应信号的接收模式，以对接收机未正确接收到的分组对每个接收模式不同地执行索引编码，并重发 索引编码数据包。 根据本发明的示例性实施例，可以有效地减少未正确接收的分组的重传频率和通信上的信道使用频率，并有效地使用有限的无线电资源。

    Structure for reducing tunnel micro pressure wave including air pipe
    40.
    发明授权
    Structure for reducing tunnel micro pressure wave including air pipe 有权
    减少隧道微压波包括空气管的结构

    公开(公告)号：US09291055B2

    公开(公告)日：2016-03-22

    申请号：US14516684

    申请日：2014-10-17

    Applicant: Korea Railroad Research Institute

    Inventor： Dong Hyeon Kim

    IPC: E21D9/14 ,  B61B13/10 ,  E21F1/00

    CPC classification number: E21F1/003 ,  B61B13/10 ,  E21D9/14

    Abstract: A structure for reducing a tunnel micro pressure wave is provided. The structure includes a hood structure formed in front of an entry of a railroad tunnel; and an air pipe section in which at least one air pipe is provided along the circumference of the hood structure, wherein the air pipe comprises a horizontal introduction section formed to be extended from an internal side of the hood structure toward a longitudinal direction of the hood structure, an outlet section formed on an external side of the hood structure, and an intermediate section connecting the horizontal introduction section and the outlet section through each other.

    Abstract translation: 提供了一种用于减小隧道微压力波的结构。 该结构包括形成在铁路隧道入口前面的罩结构; 以及空气管部，其中沿着所述罩结构的圆周设置有至少一个空气管，其中所述空气管包括水平导入部，所述水平导入部形成为从所述罩结构的内侧朝向所述罩的纵向延伸 结构，形成在发动机罩结构的外侧的出口部以及将水平引入部和出口部彼此连接的中间部。

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