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    Slam method and apparatus robust to wireless environment change
    1.
    发明授权
    Slam method and apparatus robust to wireless environment change 有权

    公开(公告)号：US11275163B2

    公开(公告)日：2022-03-15

    申请号：US16477311

    申请日：2017-12-28

    Applicant: Korea Institute of Science and Technology

    Inventor： Taikjin Lee ,  Youngmin Jhon ,  Jaehun Kim ,  Minah Seo ,  Beomju Shin

    IPC: G01S11/06 ,  G01S5/02

    Abstract: The present invention relates to SLAM (simultaneous localization and mapping) method and apparatus robust to a wireless environment change. A relative position of a moving node is estimated based on motion sensing of the moving node, the relative position of the moving node is corrected based on a comparison between a change pattern of at least one signal strength received over a plurality of time points and a signal strength distribution in a region in which the moving node is located, a route of the region is represented by using the relative position corrected as described above, and thereby, it is possible accurately estimate a position of the moving node and to create a map in which very accurate route information is recorded throughout the entire region at the same time, even if a wireless environment change such as signal interference between communication channels, expansion of an access point, and occurrence of a failure or an obstacle is made or a poor wireless environment such as lack of the number of access points occurs.

    High efficiency and high sensitivity particle capture type terahertz sensing system
    3.
    发明授权
    High efficiency and high sensitivity particle capture type terahertz sensing system 有权

    公开(公告)号：US11703442B2

    公开(公告)日：2023-07-18

    申请号：US17138919

    申请日：2020-12-31

    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

    Inventor： Minah Seo ,  Yong-Sang Ryu ,  Eui-Sang Yu ,  Taikjin Lee ,  Hyun Seok Song

    IPC: G01N21/3581 ,  G01N15/14

    CPC classification number: G01N15/1434 ,  G01N15/1404 ,  G01N2015/1415

    Abstract: Provided is a high efficiency and high sensitivity particle capture type terahertz sensing system. The particle capture type terahertz sensing system includes a sensing substrate to capture particles, and a terahertz sensor to emit terahertz electromagnetic waves to the sensing substrate to sense the particles, wherein the sensing substrate includes a base substrate and a particle capture structure layer formed on the base substrate, the particle capture structure layer includes a plurality of slits for focusing the terahertz electromagnetic waves, the particle capture structure layer captures the particles in the plurality of slits using dielectrophoresis, and an area in which the terahertz electromagnetic waves converge to the plurality of slits matches an area in which the particles are captured in the plurality of slits through the dielectrophoresis.

    Method and apparatus for wireless localization of high accuracy
    4.
    发明授权
    Method and apparatus for wireless localization of high accuracy 有权

    公开(公告)号：US10746847B2

    公开(公告)日：2020-08-18

    申请号：US16476901

    申请日：2017-12-28

    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

    Inventor： Taikjin Lee ,  Youngmin Jhon ,  Jaehun Kim ,  Boseon Yu ,  Beomju Shin ,  Jaewon Bang

    IPC: G01S5/14 ,  H04W4/029 ,  G01S5/00 ,  G01S5/02 ,  G01S11/06 ,  G01S19/01 ,  H04W88/18 ,  G01C21/20

    Abstract: The present invention relates to wireless localization method and apparatus of high accuracy, and measures strength of at least one signal that is transmitted from at least one fixed node, estimates a relative position of a moving node, generates a change pattern of at least one signal strength according to relative changes in positions of the moving node over a plurality of time points from at least one signal strength and the relative position of the moving node, and estimates an absolute position of the moving node, based on a comparison between the change pattern of the at least one signal strength and a map of a distribution pattern shape of signal strength in a region where the moving node is located. Accordingly, it is possible to accurately estimate a position of a moving node using a radio signal which not only accurately estimates the position of the moving node even in a change of wireless environment but also has almost no change in signal strength over a wide region.

    Optical imaging apparatus using metamaterial and optical imaging method using metamaterial
    6.
    发明授权
    Optical imaging apparatus using metamaterial and optical imaging method using metamaterial 有权

    公开(公告)号：US11175186B2

    公开(公告)日：2021-11-16

    申请号：US16809275

    申请日：2020-03-04

    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY ,  Center for Advanced Meta-Materials

    Inventor： Minah Seo ,  Sang-Hun Lee ,  Chulki Kim ,  Jae Hun Kim ,  Taikjin Lee ,  Deok Ha Woo

    IPC: G01J5/08 ,  G02B1/00 ,  G01J5/00

    Abstract: One embodiment of the present invention provides an optical imaging apparatus using a metamaterial including a metamaterial array sensor which includes a plurality of unit cells made of a metamaterial and is positioned adjacent to an observation object, an imaging beam providing unit which provides an imaging beam toward the metamaterial array sensor, a control beam providing unit which controls a control beam provided to the unit cell to block the imaging beam incident on the unit cell, and an imaging beam measuring unit which measures a unit cell imaging beam transmission amount passing through the unit cell by measuring an imaging beam transmission amount of the metamaterial array sensor when the imaging beam passes through the unit cell and an imaging beam transmission amount of the metamaterial array sensor when the control beam is focused on the unit cell to block the imaging beam incident on the unit cell.

    Plasmonic all-optical switch and light control method using the same
    10.
    发明授权
    Plasmonic all-optical switch and light control method using the same 有权
    等离子全光开关和光控制方法使用相同

    公开(公告)号：US09261714B2

    公开(公告)日：2016-02-16

    申请号：US14533297

    申请日：2014-11-05

    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

    Inventor： Sun Ho Kim ,  Jae Hun Kim ,  Chulki Kim ,  Kyungsun Moon ,  Min Ah Seo ,  Deok Ha Woo ,  Seok Lee ,  Jong Chang Yi ,  Taikjin Lee ,  Youngchul Chung

    IPC: G02F1/03 ,  G02F1/01 ,  G02B5/00 ,  G02F1/00 ,  B82Y20/00

    CPC classification number: G02F1/0126 ,  B82Y20/00 ,  G02B5/008 ,  G02F2203/10 ,  Y10S977/834

    Abstract: A plasmonic all-optical switch includes a graphene layer, a first dielectric layer located on the graphene layer, a nano-antenna located on the first dielectric layer, and a second dielectric layer located on the nano-antenna. An incident beam is propagated by means of a surface plasmon wave generated at an interface between the graphene layer and the first dielectric layer. Further, localized surface plasmon resonance is selectively generated at an interface between the nano-antenna and the second dielectric layer by means of a pump beam incident to the nano-antenna to decrease an intensity of the incident beam. The plasmonic all-optical switch may operate at an ultrahigh speed just with a small light energy without any electric method, greatly reduce power consumption of an IT device by applying to an all-optical transistor or the like, and increase a processing rate.

    Abstract translation: 等离子体全光开关包括石墨烯层，位于石墨烯层上的第一电介质层，位于第一电介质层上的纳米天线和位于纳米天线上的第二电介质层。 入射光束通过在石墨烯层和第一介电层之间的界面处产生的表面等离子体波传播。 此外，通过入射到纳米天线的泵浦光束在纳米天线和第二介电层之间的界面选择性地产生局部表面等离子体共振，以降低入射光束的强度。 等离子体全光开关可以在没有任何电气方式的情况下以超轻的光能运行，通过施加到全光晶体管等来大大降低IT设备的功耗，并且提高处理速率。

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