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미국 서북부 Cheeka Peak 에서의 수송에 따른 봄철 CO 와 O_3 의 특성
전병일 한국환경과학회 2002 한국환경과학회지 Vol.11 No.6
Cheeka Peak is a unique site for monitoring the background chemistry and aerosol contents of pristine marine air at mid-latitude. During long-range onshore winds that occur frequently throughout the year, it is predicted to have the cleanest air in the northern hemisphere. Measurements of CO and O_3 were conducted at Cheeka Peak Observatory(CPO) on the northwestern tip of Washington state, USA during March 6∼May 29, 2001. The data have been segregated to quantify the mixing ratio of these species in the Pacific marine atmosphere. Also the marine air masses were further classified into four categories based on 10-day backward isentropic trajectories; high, mid, and low latitude and those which had crossed over the Asian industrial region. The diurnal variation of CO and O_3 at CPO showed a similar to tendency of background measurement site. When marine air mass flowed to CPO, CO concentration was lower and O_3 was similar or higher than those of total data. The westerly flow from ocean, not easterly from continent occurred the high concentration of CO and O_3 at CPO. Using the trajectory segregation of marine air mass, the comparison of concentration according to latitude calculated. the CO concentration of Asian trajectory was lower than other latitudes, O_3 concentration was higher.
미국 오레곤주 Crater Lake 의 에어로졸 농도에 미치는 수송의 역할
전병일 한국환경과학회 2002 한국환경과학회지 Vol.11 No.7
This study was conducted to investigate the characteristics of role of transport on aerosol concentration at Crate Lake, Oregon USA for 1988.3∼1999. 5. The IMPROVE program is a cooperative measurement effort governed by a steering committee composed of representatives from USA federal and regional-state organizations. Also IMPROVE sampler is designed to obtain a complete signature of the composition of the airborne particles affecting visibility. According to 10-day backward isentropic trajectory analysis, the frequency of local, marine and Asian trajectory showed 33.1%(335 cases), 47%(478 cases), 5.2%(53 cases) respectively. The monthly variation of nss SO_4^2-, nss S, NO_3^-, K and C showed the double peak pattern, high in April∼May and August∼September and showed the lowest concentration in Winter. The other constituents concentration except for C1^-, Na, Mg was high in local trajectory than marine trajectory. A ratio nss SO_4^2- to SO_4^2- was 90.5% in marine trajectory and 98% in local trajectory. It suggest that the aerosol in Crater Lake was effected by salt. The annual mean concentration of nss SO_4^2- and nss S decreased but the the springtime concentration increased.
전병일,백광열,방효충 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.4
본 논문에서는 무인 항공기의 영상 센서를 이용한 목표물 탐지 및 추적 기법을 제안한다. 목표물 탐지 및 추적에는 영상 내 목표물을 공분산 행렬로 모델링하는 기법을 이용한다. 공분산 추적이라고도 불리는 이 기법은 목표물과 목표물 후보들을 모델링 한 뒤 유사성을 계산하여 가장 높은 유사성을 갖는 후보를 목표물로 결정하는 기법이다. 모델링에 사용하는 정보는 RGB, HVS 색공간, 영상 기울기 값과 같이 원본 화면과 동일한 크기의 화면을 구성할 수 있는 값이면 어떤 값이든 이용할 수 있다. 본 논문에서는 공분산 행렬을 이용한 탐지 및 추적기법의 성능을 무인 항공기를 이용해 촬영한 항공영상을 이용하여 검증 하였다. This paper addresses object detection and tracking algorithm in aerial image sequences from unmanned aerial vehicle. Covariance matrix of features in object window is utilized for object detection and tracking. The covariance matrix enables efficient fusion of the spatial and statistical properties of different type of features. The covariance matrix is computed with any kind of image values that can be mapping with image values of the window such as RGB, HVS color space and image gradient values. We demonstrate the performance of the algorithm on aerial image sequences.
2006-2008년 봄철 부산 지역 PM10과 PM2.5의 질량농도 및 금속성분의 화학적 특성
전병일,황용식 한국지구과학회 2010 한국지구과학회지 Vol.31 No.3
본 연구에서는 2006년부터 2008년까지 3년간 봄철에 PM10과 PM2.5를 채취하여 질량농도와 금속원소의 화학적특성, 기상인자와의 관계 분석, 황사 및 비황사시의 미세먼지 특성 그리고 이동경로에 따른 농도의 특성을 고찰하였다. 연구기간동안의 PM10, PM2.5, PM10-2.5 평균농도는 각각 126.2±89.8, 85.5±41.6, 40.7±54.9 μg/㎥이었으며 PM2.5/PM10 및PM10-2.5/PM2.5 비는 각각 0.70, 0.48이었다. 우리나라의 북서쪽인 북경을 포함한 지역과 서쪽인 상해를 포함한 지역에서공기덩어리가 이류 할 때 가장 높은 미세먼지농도를 나타내었다. Twenty-four hour integrated PM10 and PM2.5 samples were measured during springtime (March, April, and May) in Busan for three years from 2006 to 2008, and mass concentrations and metallic elements of measurement were analyzed to investigate temporal, spatial, chemical characteristics of the mass concentration and metallic elements in association with meteorological conditions including Asian Dust (AD) vs. non Asian Dust (NAD) seasons, and other air mass transport patterns. The result showed that PM10, PM2.5 and PM10-2.5 concentrations were on average of 126.2±89.8,85.5±41.6, and 40.7±54.9 μg/㎥, respectively, and the PM2.5/PM10 and PM10-2.5/PM2.5 ratios were 0.70 and 0.48,respectively. The highest concentrations of PM were observed when air parcels were originated from both northwest sector covering Beijing and west sector including Shanghai areas.
부산연안역의 대기경계층내 잔류 오존의 연직하향혼합에 의한 지표 오존농도의 변화 특성
전병일 한국환경과학회 2001 한국환경과학회지 Vol.10 No.6
The vertical structure of atmosphere was observed to investigate the variation of surface ozone concentration by vertical downward mixing of residual ozone in the atmospheric boundary layer at the Busan coastal area. Airsonde and pilot balloon measurements were made at Gamcheondong and the Kimhae airport for April 26∼27, 1996. The vertical profile of potential temperature showed a residual layer between 510m and 1800m from 2100LST April 26 to 0900LST April 27. The downward mixing of ozone in the residual layer of the atmospheric boundary layer was confirmed from vertical profile of mixing ratio near 600m in the morning. The thickness of the sea breeze layer was 900m at 1500LST April 26. Thereafter, it become to be lowered with time. A low level jet was measured near 900m at 0300LST on April 27 from a pibal measurement. Early morning sharp increase of surface ozone concentration at the Busan coastal area was caused by vertical downward mixing of ozone concentration rather than by photochemical reaction in the atmospheric boundary layer.