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정승우,김영주,김재훈,황상일,Jeong, Seung-Woo,Kim, Young-Ju,Kim, Jae-Hoon,Hwang, Sang-Il 한국지하수토양환경학회 2011 지하수토양환경 Vol.16 No.6
This study developed preliminary assessment methodology for priority listing of soil and groundwater contamination sources, considering source characteristics, local environments and risk receptors. Source characteristics were evaluated by scoring relative risk of contamination sources. Local environments were evaluated by scoring annual rainfall, hydraulic conductivity of aquifer, and annual groundwater use. Risk receptors were evaluated by scoring local population, direct distance to surface water, direct distance to drinking-water wells. Scores of each parameter were allocated by analysing distribution of parameter values obtained from government databases. Distributed scores of source characteristics local environments: risk receptors were 12 : 12 : 12. The preliminary assessment scored 0 to 36 for each soil and groundwater sources. Inventory of soil and groundwater sources consisted of 7 categories. This study applied the preliminary assessment methodology to Manan-Gu, Anyang City, Korea. The number of car repair and washing facility was the largest in the contamination source inventory. Petroleum storage facilities showed the highest assessment score. The preliminary assessment methodology also indicated that Anyang-Dong was the priority section among Anyang-Dong, Suksu-Dong, Bakdal-Dong. This study is the first trial for relative ranking soil and groundwater contamination sources by considering source and local characteristics. Therefore, further researches and revision of the preliminary assessment methodology need to be pursued for various applications.
NiO, CuO 조성비와 B-Bi-Zn 첨가가 Hexagonal-Ferrite의 투자율에 미치는 영향
정승우,김태원,전석태,명태호,최우성,Jeong, Seung-U,Kim, Tae-Won,Jeon, Seok-Tae,Myeong, Tae-Ho,Myeong, Tae-Ho 한국재료학회 2000 한국재료학회지 Vol.10 No.6
In this paper, we have studied the effect of constituent ratio NiO, CuO and doped with B-Bi-Zn on proper-ties(microstructure, density, shrinkage, permeability as a function of frequency, etc.) of hexagonal-ferrite for high fre- quency chip-inductor material about several GHz. The permeability were analyzed by impedance analyzer(100 kHz∼ 40 MHz) and network analyzed(30 MHz∼3 GHz). As a result of the characteristics. the B-Bi-Zn glass ceramic was used to lower the sintering temperature for additive as function of frequency from 100kHz to 1.8 GHz showed con-stant tends. The maximum imaginary value of complex permeability was observed near the resonance frequency of 2 GHz. 본 연구에서는 hexagonal-ferrite에서 NiO, CuO의 몰비와 B-Bi-Zn 첨가제에 따른 미세구조, 밀도 흡수율, 수축율, 주파수에 따른 투자율 등의 특성을 관찰하여 수 GHz대역의 고주파 침 인덕터용 재료로서의 가능성을 확인하고자 하였다. 투자율의 측정은 impedance analyzer 와 network analyzer를 이용하여 100kHz∼3GHz 대역까지 실시하였다. 특성의변화를 살펴본 결과 사용된 B-Bi-Zn 유리분말은 전극돠의 동시소결이 가능하게 보였으며, 복수투자율의 결과에 의하며, 1.8GHz까지는 그 값이 변화를 보이지 않고 일정하였고, 복소투자율의 허수값이 최고값에서 나타나는 공진주파수는 2 GHz 부근에서 관찰되었다.
선형마이크로폰 어레이를 이용한 저격수 거리추정 개선방법과 실험 분석
정승우,Jung, Seungwoo 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.4
If a hidden enemy is shooting, there is a threat against soldiers in recent conflicts. This paper aims to improve the localization of a muzzle using microphone array. Gunshot noise can provide information about the location of muzzle with two signals, the muzzle blast from the gun barrel and the projectile sound from the bullet. Two signals arrive to the microphone array with different arrival time and angle. If the arrival angles of the two signals are estimated, distance between sniper location and the microphone array can be calculated by using geometric principles. This method was established in 2003 by Pare. But this method has a limitation that it cannot calculate the distance when the arrival angles of the two signals are same. Also it has an error when the angle difference of arrival is small. In order to overcome this limitation, a new method is proposed that uses the change of characteristic of the projectile sound with respect to vertical distance from the trajectory. The proposed method estimates the distance correctly when the arrival angle of two signals are same, and when the angle difference between two signals is increased, the estimation error increases with respect to the angle. Therefore these two methods can be selected according to the angle difference between two signals to estimate the distance of the muzzle. Below the threshold of the angle difference, the proposed method can be used to estimate distance with smaller error than the existing method. This was demonstrated by shooting tests using actual sniper rifles.