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대기 환경이 TDOA 기법의 위치 추정 정확도에 미치는 영향 분석
최동훈(Donghun Choi),고영주(Yeong-Ju Go),이재형(Jaehyung Lee),나태흠(Taeheum Na),최종수(Jong-Soo Choi) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
TDOA position estimate from acoustic measurement of artillery shell impact is studied in order to develop a targeting evaluation system. Impact position is calculated from the intersections of hyperbolic estimates based on the least square Taylor series method. The mathematical process of Taylor series estimation is known to be robust. However, the concern lays with the accuracy because it is sensitive to the bias caused by the randomness of measurement situation. The measurement error typically occurs from the distortion of waveform, change of travelling path, and sensor position error. For outdoor measurement, a consideration should be made on the atmospheric condition such as temperature and wind which can possibly change the trajectories of rays of sound. It produces wrong propagation time events accordingly. Ray tracing and optimization techniques are introduced in this study to minimize the bias induced by the ray of sound. The experiments were carried out in the football field with a sport start gun as an impact source. The array of sensors are deployed around the source and a weather monitored is positioned with it to acquire environmental information. The comparison of experimental result and numerical simulation shows that the atmospheric correction improves the estimation accuracy.
음선 추적을 이용한 폭발음 위치추정 오차 보정에 대한 연구
최동훈(Donghun Choi),고영주(Yeong-Ju Go),이재형(Jaehyung Lee),나태흠(Taeheum Na),최종수(Jong-Soo Choi) 한국소음진동공학회 2016 한국소음진동공학회 논문집 Vol.26 No.1
TDOA(time delay of arrival) position estimate from acoustic measurement of artillery shell impact is studied in order to develop a targeting evaluation system. Impact position is calculated from the intersections of hyperbolic estimates based on the least square Taylor series method. The mathematical process of Taylor series estimation is known to be robust. However, the concern lays with the accuracy because it is sensitive to the bias caused by the randomness of measurement situation. The measurement error typically occurs from the distortion of waveform, change of travelling path, and sensor position error. For outdoor measurement, a consideration should be made on the atmospheric condition such as temperature and wind which can possibly change the trajectories of rays of sound. It produces wrong propagation time events accordingly. Ray tracing and optimization techniques are introduced in this study to minimize the bias induced by the ray of sound. The numerical simulation shows that the atmospheric correction improves the estimation accuracy.
병렬형 하이브리드 전기자동차의 엔진/모터/배터리 용량 및 운전전략 최적화
오경철(Kyoungcheol Oh),최동훈(Donghun Choi),김현수(Hyunsoo Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The core technology of hybrid electric vehicle is to reduce fuel consumption and emissions. In order to analyze the HEV performance, it is carried out mathematical modeling of the HEV powertrains and development of the HEV performance simulator. This paper presents optimum power distribution ratio between the engine and the motor is obtained which minimizes the objective function by the penalty function method. An objective function is suggested, which consists of total engine fuel consumption and total electric energy. It is found from the optimization results that the optimal power distribution ratio can be obtained easily compared with those by the existing trial and error design method. An optimization process is proposed to determine the engine/motor/battery size to obtain the minimum fuel consumption while satisfying vehicle acceleration performance and an optimization process of HEV control strategy using the results determined in the first optimization process.
지면반사효과를 이용한 폭발 소음원의 위치 추정 정밀도 향상법
고영주(Yeong-Ju Go),최동훈(Donghun Choi),이재형(Jaehyung Lee),최종수(Jong-Soo Choi),하재현(Jae-Hyoun Ha),나태흠(Taeheum Na) 한국소음진동공학회 2016 한국소음진동공학회 논문집 Vol.26 No.1
A technique for improving estimation accuracy is introduced in order to locate the impact position of artillery shell during the weapon scoring test. Study on localization of impacts using acoustic measurement has been conducted and the usability of sensor array is verified with experiments. When the blast occurs above the ground in the firing range, the acoustic sensor above the ground can measure the directly propagated sound with the ground-reflected one. In this study, a method for reducing estimation error by using the reflection signal measurements based on the time difference of arrival method. Considering the reflection sound works as same as placing a virtual sensor symmetrically through the ground. This idea enables a virtual three-dimensional array configuration with a two-dimensional plane array above the ground as such. The time difference between the direct and the reflected propagations can be estimated using cepstrum analysis. Performance test has been made in the simulation experiment in the football size area.
신진섭 ( Jinseop Shin ),박재원 ( Jaewon Park ),최동훈 ( Donghun Choi ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.1
학술활동 생명주기는 저자, 학술단체 및 정보서비스 제공자의 관점에서 논문투고, 심사, 출판, 데이터베이스 구축, 정보서비스로 정의될 수 있다. 생명주기 단계별로 학술단체들은 온라인 또는 오프라인 도구들을 이용해 저자와 심사위원들간의 커뮤니케이션을 돕고 있으며, 정보서비스 제공기관들은 출판된 학술정보를 수집하고 데이터베이스를 구축하여 정보서비스를 제공하고 있다. 이들 단계들에 표준식별체계를 적용하여 유기적으로 연결해 주면 생명주기 활동에 들어가는 전체적인 시간, 노력, 비용을 절감 할 수 있다. 이 발표에서는 학술활동 생명주기의 이해당사자들의 요구를 전반적으로 만족시키기 위해 개발된 DOI 등록관리 서비스의 설계 및 구현에 대해서 논한다.