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부산지역 2020년 3월 19일 한랭전선 통과 시 미세먼지 농도 특성
전병일,Jeon, Byung-Il 한국환경과학회 2021 한국환경과학회지 Vol.30 No.6
This research investigated the characteristics of fine particles during cold front passage in Busan, on March 19, 2020. The cold front speed was 17.4 m/s (about 63k km/hr), moving from the northwest to the southeast, and with a width of about 64 km. The backward trajectory analysis showed that a southern sea air parcel flowed into Busan before the cold front passage, carrying continental materials from China transported into Busan after cold front passage. The PM<sub>10</sub> concentration in Busan showed a rapid increase after passing through the cold front, with PM<sub>2.5</sub> showing a high concentration during cold front passage. The PM<sub>2.5</sub>/PM<sub>10</sub> ratio was 0.10 - 0.30. When the cold front passed, SO<sub>4</sub><sup>2-</sup>, NO<sub>3</sub><sup>-</sup>, Ca<sup>2+</sup>, NH<sub>4</sub><sup>+</sup>, Na<sup>+</sup>, and K<sup>+</sup> in PM<sub>2.5</sub> showed a rapid increase, with SO<sub>4</sub><sup>2-</sup> showing the most significant increase. These results indicated that understanding the characteristics of fine particles during cold front passage in Busan could provide insight into establishing a strategy to control urban air quality.
여름철 북태평양고기압 하에서 사쿠라지마 화산 분출(2018년 7월 16일)이 부산지역 초미세먼지 농도에 미치는 영향
전병일 한국환경과학회 2022 한국환경과학회지 Vol.31 No.6
This research investigated the effect of the eruption of Japan Sakurajima volcano on the concentration of ultrafine particle when the north Pacific high pressure exists in the Busan in summer. As a result of analyzing the forward trajectory using the HYSPLIT model, the air parcel from Sakurajima volcano passed through the sea in front of Busan at 1500 LST on July 17, 24 hours after the volcanic eruption. As a result of analyzing the PM10 and PM2.5 concentrations in the Busan for two days from July 16 to 17, 2018, the Sakurajima eruption in Japan, it can be seen that there was a high increase in PM10 and PM2.5 concentrations compared to the previous day. As a result of analyzing the backward trajectory, the air mass that reached Busan at 1300 LST on July 17, 2018 has moved near the Sakurajima volcano at 1,500 m, 2,000 m, and 3,000 m. The concentration of SO4 2- in PM2.5, the concentration of all three stations in Busan showed a sharp increase from 1000 LST on July 17th. Looking at the NH4 + concentration in PM2.5, it shows a very similar variation trend to SO4 2-, and the correlation coefficient between the two components is 0.96 for Jangrimdong and Yeonsandong, and 0.85 for Busan New Port. Looking at the NO3 - concentration in PM2.5, the same high concentrations as SO4 2- and NH4 + were not observed in the afternoon of July 17th.
부산지역 2018년 11월 28일과 11월 30일 황사 발생 시의 기상과 PM2.5 중의 이온성분 특성
전병일 한국환경과학회 2022 한국환경과학회지 Vol.31 No.6
This study investigated characteristics of meteorological parameters and ionic components of PM2.5 during Asian dust events on November 28 and 30, 2018 at Busan, Korea. The seasonal occurrence frequencies of Asian dust during 1960∼2019 (60 years) were 81.7% in spring, 12.2% in winter, and 6.1% in autumn. Recently, autumn Asian dust occurrence in Busan has shown an increasing trend. The result of AWS (automatic weather station), surface weather chart, and backward trajectory analyses showed that the first Asian dust of Nov. 28, 2018, in Busan came with rapid speed through inner China and Bohai Bay from Mongolia. The second Asian dust of Nov. 30, 2018, in Busan seems to have resulted from advection and deposition of proximal residual materials. These results indicated that understanding the characteristics of meteorological parameters and ionic components of PM2.5 during Asian dust events could provide insights into establishing a control strategy for urban air quality.
부산지역 여름철 해풍 발생 시 미세먼지와 초미세먼지 중의 이온성분 특성
전병일,Jeon, Byung-Il 한국환경과학회 2021 한국환경과학회지 Vol.30 No.6
This research investigated the characteristics of fine particle concentration and ionic elements of PM<sub>2.5</sub> during sea breeze occurrences during summertime in Busan. The PM<sub>10</sub> and PM<sub>2.5</sub> concentrations of summertime sea breeze occurrence days in Busan were 46.5 ㎍/m<sup>3</sup> and 34.9 ㎍/m<sup>3</sup>, respectively. The PM<sub>10</sub> and PM<sub>2.5</sub> concentrations of summertime non-sea breeze occurrence days in Busan were 25.3 ㎍/m<sup>3</sup> and 14.3 ㎍/m<sup>3</sup>, respectively. The PM<sub>2.5</sub>/PM<sub>10</sub> ratios of sea breeze occurrence days and non-sea breeze occurrence days were 0.74 and 0.55, respectively. The SO<sub>4</sub><sup>2-</sup>, NH<sub>4</sub><sup>+</sup>, and NO<sub>3</sub><sup>-</sup> concentrations in PM<sub>2.5</sub> of sea breeze occurrence days were 9.20 ㎍/m<sup>3</sup>, 4.26 ㎍/m<sup>3</sup>, and 3.18 ㎍/m<sup>3</sup> respectively. The sulfur oxidation ratio (SOR) and nitrogen oxidation ratio (NOR) of sea breeze occurrence days were 0.33 and 0.05, respectively. These results indicated that understanding the fine particle concentration and ionic elements of PM<sub>2.5</sub> during sea breeze summertime conditions can provide insights useful for establishing a control strategy of urban air quality.
영상 내 목표물 추적 및 목표물의 위치 추정 기법의 온보드 구현
전병일,김영주,방효충,김용호,백일현 한국항공우주학회 2012 한국항공우주학회 학술발표회 논문집 Vol.2012 No.11
본 논문에서는 무인 항공기에 장착되는 영상 장비를 이용하여 영상 내 목표물 추적 및 목표물의 실제위치를 추정하는 기법을 온보드로 구현한다. 영상 내 목표물 추적 기법은 커널 정보를 이용한 목표물추적 기법을 사용하며, 영상 내 목표물의 위치를 실시간으로 추적한다. 그리고 영상 내 목표물 추적을 통해 알아낸 영상 내 목표물의 위치와 항공기의 위치, 자세 정보, 김발의 자세 정보를 이용하여 목표물의 실제 위치를 추정한다. 이러한 기법들을 실제 비행에 적용할 수 있는 온보드 시스템으로 구현한 뒤, 모의 시험을 통하여 성능을 검증 하였다. This paper realizes an on-board system tracking the Target on camera frames and estimating inertial locations of the Target. It tracks moving objects on camera frames that Kernel-based Target Tracking algorithm. Then, we know pixel locations of the target. With this information, we can estimate its inertial location. It is called the Geo-location. In the Geo-location process, the inertial location is estimated using positions and attitudes of the UAV, poses of the gimbal system and pixel locations of the target. We realize these algorithms on on-board computer and verify the performance of the system by indoor experiments.
부산지역 여름철 고농도 PM<sub>2.5</sub> 농도 사례와 기상학적 관련성
전병일,Jeon, Byung-Il 한국환경과학회 2020 한국환경과학회지 Vol.29 No.7
This research investigated the meteorologically relevant characteristics of high PM<sub>2.5</sub> episodes in Busan. The number of days when daily mean PM<sub>10</sub> concentration exceeded 100 ㎍/㎥ and the PM<sub>2.5</sub> concentration exceeded 50 ㎍/㎥ over the last four years in Busan were 24 and 58, respectively. Haze occurrence frequency was 37.6% in winter, 27.4% in spring, 18.6% in fall, and 16.4% in summer. Asian dust occurrence frequency was 81.8% in spring, 9.1% in fall and winter, and 0% in summer. During summer in Busan, high PM<sub>2.5</sub> episode occurred under the following meteorological conditions. 1) Daytime sea breeze. 2) Mist and haze present throuout the day. 3) Anti-cyclone located around the Korean peninsula. 4) Stable layer formed in the lower atmosphere. 5) Air parcel reached Busan by local transport rather than by long-range transport. These results indicate that understanding the meteorological relevance of high PM<sub>2.5</sub> episodes could provide insight for establishing a strategy to control urban air quality.