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서울 대기 중 PM<sub>2.5</sub> 내 OC와 EC로부터 SOC 추정방법의 비교 평가
유하영,김기애,김용표,정창훈,신혜정,문광주,박승명,이지이,Yoo, Ha Young,Kim, Ki Ae,Kim, Yong Pyo,Jung, Chang Hoon,Shin, Hye Jung,Moon, Kwang Ju,Park, Seung Myung,Lee, Ji Yi 한국입자에어로졸학회 2020 Particle and Aerosol Research Vol.16 No.1
The organic carbon in the ambient particulate matter (PM) is divided into primary organic carbon (POC) and secondary organic carbon (SOC) by their formation way. To regulate PM effectively, the estimation of the amount of POC and SOC separately is one of important consideration. Since SOC cannot be measured directly, previous studies have evaluated determination of SOC by the EC tracer method. The EC tracer method is a method of estimating the SOC value from calculating the POC by determining (OC/EC)pri which is the ratio of the measured values of OC and EC from the primary combustion source. In this study, three different ways were applied to OC and EC concentrations in PM<sub>2.5</sub> measured at Seoul for determining (OC/EC)pri: 1) the minimum value of OC/EC ratio during the measurement period; 2) regression analysis of OC vs. EC to select the lower 5-20% OC/EC ratio; 3) determining the OC/EC ratio which has lowest correlation coefficient value (R<sup>2</sup>) between EC and SOC which is reported as minimum R squared method (MRS). Each (OC/EC)pri ratio of three ways are 0.35, 1.22, and 1.77, respectively from the 1 hourly data. We compared the (OC/EC)pri ratio from 1hourly data with 24 hourly data and revealed that (OC/EC)pri estimated from 24 hourly data had twice larger than 1hourly data due to the low time resolution of sampling. We finally confirmed that the most appropriate value of (OC/EC)pri is that calculated by a regression analysis of 1 hourly data and estimated SOC amounts at PM<sub>2.5</sub> of the Seoul atmosphere.
PM<SUB>2.5</SUB>의 물리ㆍ화학적 특성에 관한 연구
김현재(Hyun-Jae Kim),안준영(Joon-Young Ahn),문광주(Kwang-Ju Moon),김종춘(Jong-choon Kim),김정수(Jeong-Su Kim),이민도(Min-Do Lee),이석조(Suk-Jo Lee),전하은(Ha-Eun Jeon),오준(Jun Oh),최진수(Jin-Soo Choi),박승명(Seung-Myung Park),박종성(J 한국환경관리학회 2010 環境管理學會誌 Vol.16 No.2
본 연구에서는 PM2.5 측정방법과 분석방법을 검토하였으며, 서울, 인천, 대전, 광주, 대구, 부산, 울산 7개 도시와 배경지역인 제주 고산의 PM2.5 농도, 주요성분인 이온, 탄소, 금속성분을 조사하였다. 또한 계절별로 집중관측을 통해 PM2.5 입자의 성장과 주변배출원의 영향 및 장거리 이동하는 입자의 특징을 분석하여 전국 7개 광역시의 배출원별 기여율을 추정함으로써 향후 PM2.5 관리정책의 기초자료를 얻었고 수용모델을 사용하여 주요 도시의 배출원별 기여율을 추정한 결과, 5~8개의 주요 배출원을 추정하였다.
화상 후 두피에 생긴 편평 상피세포 종양에 대한 증례 보고 - 증례보고 -
김강산 ( Kang San Kim ),황형식 ( Hyung Sik Hwang ),권흠대 ( Heum Dai Kwon ),문승명 ( Seung Myung Moon ),오석준 ( Suk Jun Oh ),최선길 ( Sun Kil Choi ) 대한외상학회 2007 大韓外傷學會誌 Vol.20 No.1
Marjolin`s ulcer is a rare and often-aggressive cutaneous malignancy that arises in previously traumatized or chronically inflamed skin, particularly after burns. We experienced two cases after burns. Case I involved a forty eight year-old man who had suffered from a flame burn at the parietal scalp area, where had been initially described three years earlier as a full-thickness wound including the pericranium. The man consulted us for a persistent ulcerative and infected wound on the burned lesion during the last 24 months, which turned out on the contrast-enhanced computed tomography (CT) and magnetic resonance imaging (MRI) to be the squamous cell carcinoma with involving the skull and the dura mater. Although the posterior auricular lymph node was enlarged on the ipsilateral side, recent positron emission tomography (PET) CT did not show any metastatic lesion. It was impossible for us to resect the intracranial involvement of the tumor radically, and the postoperative PET CT still showed a focal fluorodeoxyglucose (FDG) uptake around the wall of the superior sagittal sinus. We think that an aggressive combined approach is essential for treatment in early stages for a high success rate, before the intracranial structures are involved because there is no consensus on the treatment for advanced disease, and the results are generally poor. Case 1 also did not involve a radical resection because of the intracranial invasion to the wall of superior sagittal sinus and the possibility of damage to the major cortical veins. He received adjuvant radiotherapy and must be followed periodically. Case 2 involved an eighty six year-old women who suffered from a painful scalp ulcer lesion after flame burns three years earlier. Unlike case 1, neither tumor infiltration into the dura nor lymph node enlargement was observed on the contrast-enhanced computed tomography (CT), magnetic resonance imaging (MRI), or positron emission tomography (PET) CT. We did a radical resection of the tumor, including the involved bone, and a cranioplasty with bone cement. (J Korean Soc Traumatol 2007;20:52-56)
측두골 골절후 발생한 안면마비 환자의 안면신경감압술: 25명 환자들의 증례분석
남한가위 ( Han Ga Wi Nam ),황형식 ( Hyung Sik Hwang ),문승명 ( Seung Myung Moon ),신일영 ( Il Young Shin ),신승훈 ( Seung Hun Sheen ),정제훈 ( Je Hoon Jeong ) 대한외상학회 2013 大韓外傷學會誌 Vol.26 No.3
Purpose: The aim of this study is to present a retrospective review of patients who had a sudden onset of facial palsy after trauma and who underwent facial nerve decompression. Methods: The cases of 25 patients who had traumatic facial palsy were reviewed. Facial nerve function was graded according to the House-Brackmann grading scale. According to facial nerve decompression, patients were categorized into the surgical (decompression) group, with 7 patients in the early decompression subgroup and 2 patients in the late decompression subgroup, and the conservative group(16 patients). Results: The facial nerve decompression group included 8 males and 1 female, aged 2 to 86 years old, with a mean age of 40.8. In early facial nerve decompression subgroup, facial palsy was H-B grade I to III in 6 cases (66.7%); H-B grade IV was observed in 1 case(11.1%). In late facial nerve decompression subgroup, 1 patient (11.1%) had no improvement, and the other patient(11.1%) improved to H-B grade III from H-B grade V. A comparison of patients who underwent surgery within 2 weeks to those who underwent surgery 2 weeks later did not show any significant difference in improvement of H-B grades (p>0.05). The conservative management group included 15 males and 1 female, aged 6 to 66 years old, with a mean age of 36. At the last follow up, 15 patients showed H-B grades of I to III(93.7%), and only 1 patient had an H-B grade of IV(6.3%). Conclusion: Generally, we assume that early facial nerve decompression can lead to some recovery from traumatic facial palsy, but a prospective controlled study should and will be prepared to compare of conservative treatment to late decompression.