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고영주,Go, Yeong-Ju 한국과학기술단체총연합회 1995 과학과 기술 Vol.28 No.7
정부출연기관 통폐합ㆍ민영화 추진을 둘러싸고 과학기술계가 몸살을 앓고 있다. 정부의 백지화 발표에도 우수 인력은 계속 빠져나가고 있다. WTO체제 출범으로 어느 때보다도 기술자립이 시급한 이때 출연기관의 올바른 역할수행을 위해 정부의 근복적인 대책수립을 촉구한다.
이동하는 소음원 위치 추정을 위한 다양한 빔형성 기법 적용
고영주(Yeong-Ju Go),이재형(Jaehyung Lee),최종수(Jong-Soo Choi),하재현(Jae-Hyoun Ha) 한국소음진동공학회 2016 한국소음진동공학회 논문집 Vol.26 No.5
Capabilities of several beamforming techniques are compared for estimating the position of a moving source. Beamforming has enabled to widen our perspective of aeroacoustics in wind tunnel experiments and has provided useful approach in array measurements. Meanwhile beamforming techniques have been developed in a way to improve estimation accuracy and to save ing effort at the same time. In order to achieve reasonable outcome from aeroacoustic measurement, it is important to identify the spectral characteristics of source and to select an appropriate beamformer. Though aeroacoustic sources normally generates broadband noises, many array signal processing have been focused on narrowband processing which makes calculation numerically efficient. However, calculation in frequency-domain requires selection of single frequency of interest which affects spatial resolution and sidelobe level as a consequence. To be able to localize broadband noise source, it is proposed to use broadband beamforming. The formulas implements the deletion of diagonal term from cross spectral matrix. In this study, trajectory of flying source emitting broadband noise was simulated and several beamformers are applied.
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.