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3D Moving Target Tracking Using TDoA and FDoA Measurements based on SIR Particle Filter
Hongseok Jung(정홍석),Jaebok Lee(이재복),Paulson Eberechukwu,Sunwoo Kim(김선우) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
The accuracy of outdoor moving-target tracking systems usually suffers from ranging errors, sensor position, and velocity errors caused by low SNR (signal noise ratio) and non-line-of-sight (NLOS) conditions. In this paper, we propose a new method for moving-Target tracking using joint time-difference-of-arrival (TDoA) and frequency difference-of-arrival (FDoA) measurements. In this work, we introduce particle filter to fuse the interval measurement of TDoA and FDoA for estimating the velocity and position of a moving target. The particle filter plays a key role in the field of moving target detection and estimation, such as unmanned aerial vehicles (UAVs). The estimated interval must contain the actual values of the position and velocity of the moving target. The simulation is expected to improve the accuracy of the positioning performance while minimizing the sensor position and velocity error.
벡터스페이스모델과 시소러스를 이용한 특허검색시스템의 성능향상
임성신(Sungshin lim),정홍석(Hongseok Jung),한기덕(Gideok Han),권혁철(Hyuk-Chul Kwon) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.2Ⅰ
지적재산권이 산업의 핵심으로 자리잡음으로써 특허의 중요성이 날로 증가하고 있다. 현재 특허문서 검색을 서비스하고 있는 상용시스템의 경우 문서간의 유사도나, 질의어에 따른 순위 (Ranking)가 매겨지지 않는 불리 언 모델이 검색에 시용되고 있다. 본 논문에서는 유사도에 기반한 순위화가 가능한 벡터모델기반의 특허검색 시스템을 개발하고 시계분야의 시소러스를 구축하여 시계분야의 특허검색 시스템에 적용하였다. 쿼리확장의 성능을 평가하기 위해 10개의 쿼리로 실험하였고 평균 36.2% 의 정확도가 향상되었다. 그리고 검색결과의 오른쪽에 시소러스를 제시함으로써 특허검색시스템을 이용하는 사용자에게 추가 질의어를 쉽게 선택할 수 있도록 하여 인터페이스 부문의 향상을 추구하였다.
질소산화물 저감을 위한 SCR TYPE CEM의 설계평가
정석윤(Seokyoon Jeong),정홍석(Hongseok Jung),이근우(Kunwoo Yi),조연근(Yonguen Cho),김경훈(Kyunghun Kim),김혜삼(Hyesam Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
SCR system for diesel engine vehicles is a device to reduce NOx from the emission gas of the diesel engine causing selective catalytic reaction by utilizing a metal catalyst with ammonia, NH₃, or HC as a reductant, and the device is recognized as a unique technology to meet future emission regulation for NOx such as Euro-V (2008). Under the current circumstance that the development for diverse post process technologies is in process, in this study, we evaluated the pressure and uniformity inside of SCR TYPE CEM(Catalyst Exhaust Muffler) reducing NOx among noxious gasses, through design and CFD(Computational Fluid Dynamics) analysis.
하준범,구가람,정철웅,설한신,정홍석,정민석,Ha, Junbeom,Ku, Garam,Cheong, Cheolung,Seol, Hanshin,Jeong, Hongseok,Jung, Minseok 한국음향학회 2022 韓國音響學會誌 Vol.41 No.3
In this study, each component of flow noise source of underwater propeller installed to the scale model of the KVLCC2 is investigated and the effect of each noise source on underwater-radiated noise is quantitatively analyzed. The computation domain is set to be the same as the test section of the large cavitation tunnel in the Korea Research Institute of Ship and Ocean Engineering. First, for the high-resolution computation of flow field which is noise source region, the incompressible multiphase Delayed Detached Eddy Simulation is performed. Based on flow simulation results, the Ffowcs Williams and Hawkings integral equation is used to predict underwater-radiated noise and its validity is confirmed through the comparison with the tunnel experiment result. For the quantitative comparison on the contribution of each noise source, the spectral levels of sound pressure and power levels predicted using propeller tip-vortex cavitation, blade surface and rudder surface as the integral region of noise sources are investigated. It is confirmed that the cavitation which is monopole noise source significantly contributed to the underwater-radiated noise than propeller blades and rudder which is dipole noise source, and the rudder have more contribution than propeller blades due to the influence of the propeller wake.