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Efficient terahertz oscillation using a half-period staggered grating resonator
Kwon, Ohjoon,Sattorov, Matlabjon Abdurahimovich,Min, Sun-Hong,Baek, In-Keun,Kim, Seontae,Bera, Anirban,Barik, Ranjan Kumar,Bhattacharya, Ranajoy,Jeong, Jin-Young,Won, Jong-Hyo,Park, Gun-Sik IOP Publishing 2014 Japanese journal of applied physics Vol.53 No.6
A highly efficient terahertz (THz) radiation mechanism is studied with the use of strong interaction between convection electrons and a half-period phase-shifted grating resonator. The large fraction of the fundamental TE mode is longitudinally polarized, and it excites the intense plasma-terahertz wave coupling at the shallow grating, which enables highly efficient RF generation at a relatively low operating voltage. A particle-in-cell (PIC) simulation predicts that the half-period phase-staggered grating resonator generates 0.22 THz wave with output power exceeding 100 W and interaction efficiency of more than 15% at a low beam acceleration voltage of 5.2 kV. (C) 2014 The Japan Society of Applied Physics
Lane Confidence Assessment and Lane Change Decision for Lane-level Localization
Heong-tae Kim,Ohjoon Kwon,Bongsob Song,Hoon Lee,Hyungsun Jang 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
This paper presents the confidence assessment algorithm of lane mark detected by a vision sensor for lane change decision and its application to lane-level localization. The lane mark information is critical to determine whether driving maneuver is either lane following or lane change. Furthermore, it should be considered that the detected lane mark could be wrong due to its worn-out or soil/snow/obstacles on the mark. Thus it is necessary to assess the confidence of lane. By using detection results of each side of lane from vision sensor and vehicle state measured by in-vehicle sensor, lane confidence assessment algorithm based on probabilistic data association filter (PDAF) is proposed. And by using estimation results from PDAF, lane change decision algorithm is also proposed. The proposed algorithms are validated experimentally via field test data.