서울시 도로변에서 입자상 다환방향족탄화수소의 농도 특성

이지이(Ji Yi Lee),김용표(Yong Pyo Kim),배귀남(Gwi-Nam Bae),박수미(Su-Mi Park),진현철(Hyun-Chur Jin) 한국대기환경학회 2008 한국대기환경학회지 Vol.24 No.2

Five intensive measurements of particulate PAHs were made at a roadside in Seoul from May 2005 to June 2006. The average concentration of particulate PAHs was 15.1±10.6 ng m?³. The high concentrations of particulate fluoranthene and pyrene were observed in November 2005 due to the influence of the lower ambient temperature. Compared to the previous results at tunnel and ambient sites in Seoul, larger fraction of the high molecular PAH compounds which consist with five or six benzene rings, was observed at a roadside. This might indicate high influence of vehicle emission at a roadside. The distribution of diagnostic ratios for specific PAH compounds indicated that the influence of vehicular emission, especially diesel vehicular emission seems to be high at a roadside.

터널 내 기체 및 입자상 다환방향족탄화수소(PAH) 분포 특성

이지이(Ji Yi Lee),이승복(Seung-Bok Lee),김진영(Jin Young Kim),진현철(Hyoun Cher Jin),임형배(Hyung Bae Lim),배귀남(Gwi-Nam Bae) 한국대기환경학회 2014 한국대기환경학회지 Vol.30 No.6

Twenty four individual polycyclic aromatic hydrocarbon (PAH) compounds both in gas- and particle-phase were quantified in three tunnels (Namsan Tunnel 3, Jeongneung Tunnel, Bukak Tunnel) to characterize vehiculate emission of PAHs. Gas phase PAHs were dominant in tunnels which consisted of 85% of total PAHs concentrations. Naphthalene and 2-methyl naphthalene were the most abundant gas phase PAH compounds, while the concentrations of fluoranthene and pyrene were highest in the particle phase. Most (96%) of the gas phase PAH compounds consisted of two- and three-aromatic rings whereas most of the particle phase PAHs were in four and five-rings (67%) in tunnels. Average BaP-eq concentrations of PAHs in the particle phase (20.8±11.6 ng m-3) was about twenty fold higher than that in the gas phase (1.6±0.6 ng m-3). It means that the particle phase PAHs has more adverse health effect than the gas phase PAHs even though the concentrations of the particle phase PAHs were lower than those of the gas phase PAHs. Compared to previous studies reporting diagnostic ratios for specific PAH compounds, the profile of individual PAH compounds measured in this study reflected well for the vehiculate emissions. We reported, for the first time, on the results of the profile of individual PAH compounds measured in tunnels for both gas and particle phases.

Thermal Desorption-comprehensive Two Dimensional Gas Chromatography-time of Flight Mass Spectrometry (TD-GCxGC-TOFMS)을 이용한 서울 대기 중 PM<SUB>2.5</SUB> 유기성분 분석

이지이(Ji Yi Lee),Douglas A. Lane,허종배(Jong-Bae Huh),이승묵(Sung-Muk Yi),김용표(Yong Pyo Kim) 한국대기환경학회 2009 한국대기환경학회지 Vol.25 No.5

Characteristics and advantages of the thermal desorption-comprehensive two dimensional gas chromatographytime of flight mass spectrometry (TD-GCxGC-TOFMS) were discussed and the organic compound’s analysis result was shown for the ambient PM<SUB>2.5</SUB> sample collected in Seoul, Korea. Over 10,000 individual organic compounds were separated from about 70 μg of aerosols in a single procedure with no sample pre-treatment. Among them, around 300 compounds were identified and classified based on the mass fragmentation patterns and GCxGC retention times. Several aliphatic compounds groups such as alkanes, alkenes, cycloalkanes, alkanoic acids, and alkan-2-ones were identified as well as 72 PAH compounds including alkyl substituted compounds and 8 hopanes. In Seoul aerosol, numerous oxidized aromatic compounds including major components of secondary organic aerosols were observed. The inventory of organic compounds in PM<SUB>2.5</SUB> of Seoul, Korea suggested that organic aerosol were constituted by the compounds of primary source emission as well as the formation of secondary organic aerosols.

창조성 신장을 위한 독서토론 수업 모형 연구

이지이 ( Ji Yi Lee ) 창조교육학회 2011 창조교육논총 Vol.13 No.-

The 21st society which is based on knowledge requires a talented man who has the opwer of creative thinking, not the power of just memorizing some information. With this trend, the department of the subject, Korean Language is trying to internalize accurate and effective principle of the Korean usage and its action, critically understand various Korean materials, and improve the skills needed to express creatively some ideologies and emotions, for enhancing creative Korean use. Thus, the classroom for Korean language use. In that kind of classroom, students can be placed at the center of the learning and can improve their skills for the creative use of Korean language. For this time of age, education should be the one that emphasize the abilities to criticize the abnormal and to think creatively. Furthermore, creativity itself also can be the meaningful power only when people can express their thoughts and imagination freely without confining them in one abstract frame that is given from outside. Therefore, education should be developed from the cramming one to the self-centered one by having students be familiar with the process rather than the result, putting the power of criticla and creative thinking at the center and by having students communicate with different subjects or various books, since the education which is confined in just one certain subject is not effective. The debate about the nature of the education for creativity is concluded with the fact that humans are highly developed animal to have creativity and thus the theory for the creativity teaching and learning process aims at the development of that creativity. This teaching model making students manage their own learning porcesses develops the poser of the value through their thinking process and experiences. This study focuses on how the teaching model for post-reading discussion including Five-step Teaching Method for Creative Education brings changes in recogntion for creativity improvement. This study has the meaning in that it clarify the concept of debate and make it firm that the teaching model for post-reading discussion applying Five-step Teaching Method for Creative Education and parliamentary debating method cotributes to the debelopment of the ability to debate and the formation of highly structured thinking. Students should be educated to be the real creative people developed with the exploratory abilities which can be obtained through true education for reading and debating and that kind of abilities can lead the students to a highly structured way of thinking such as inference, judgemet, comparison, and application which are fir more sophisticated than just memorizing something. Therefore, the true assignment in developing the power of creative thinking can be to create educational environment for boosting highly-developed exploratory thinking skill and recognize that abilities in them.

서울시 도로변에서 입자상 다환방향족탄화수소의 농도 특성

이지이(Ji Yi Lee),김용표(Yong Pyo Kim),배귀남(Gwi-Nam Bae),박수미(Su-Mi Park),진현철(Hyun-Chur Jin) 한국대기환경학회 2008 한국대기환경학회지 Vol.24 No.E2

Five intensive measurements of particulate PAHs were made at a roadside in Seoul from May 2005 to June 2006. The average concentration of particulate PAHs was 15.1±10.6 ng m?³. The high concentrations of particulate fluoranthene and pyrene were observed in November 2005 due to the influence of the lower ambient temperature. Compared to the previous results at tunnel and ambient sites in Seoul, larger fraction of the high molecular PAH compounds which consist with five or six benzene rings, was observed at a roadside. This might indicate high influence of vehicle emission at a roadside. The distribution of diagnostic ratios for specific PAH compounds indicated that the influence of vehicular emission, especially diesel vehicular emission seems to be high at a roadside.

미세먼지관리 특성화대학원 주요 연구 소개 2 : 동북아시아 지역의 고농도 미세먼지 특성 파악을 위한 국제공동관측 연구

이지이(Ji Yi Lee) 대한토목학회 2025 대한토목학회지 Vol.73 No.2

2017년 서울시 O₃과 PM<SUB>2.5</SUB>의 계절별 상관분석 연구

이하경(Ha Kyung Lee),최은락(Eun Lak Choi),이현지(Hyun Ji Lee),이수영(Su Young Lee),이지이(Ji Yi Lee) 한국대기환경학회 2020 한국대기환경학회지 Vol.36 No.4

To characterize the correlation between tropospheric O₃ and PM<SUB>2.5</SUB> by season, a comprehensive analysis for the interaction between tropospheric O₃ and PM<SUB>2.5</SUB> has been performed over 25 sites in Seoul in 2017. Highly positive correlation between O₃ and PM<SUB>2.5</SUB> was observed during the summer period (June, July, and August) and this is related to the simultaneous formation of O₃ and PM<SUB>2.5</SUB> due to an increase of the atmospheric oxidation ability. While, correlations of O₃ and PM<SUB>2.5</SUB> were negative in the winter period (January, February, and December), showing the opposite trend with summer. The negative correlation for O₃ and PM<SUB>2.5</SUB> in winter might be due to both aerosol-radiation interactions and the O₃ titration effect by NOx. We also found that NOx plays a more significant role to decrease O₃ concentration than PM<SUB>2.5</SUB> on a low concentration of O₃ in winter. It indicates that there are seasonal difference for the mechanisms of O₃ and PM<SUB>2.5</SUB> interaction. Therefore, it is required on a different O₃ and PM<SUB>2.5</SUB> reduction approach for each season.

수용 모델을 이용한 서울시의 PAHs 주요 배출원 추정

한상희,이지이,김용표,Han, Sang Hee,Lee, Ji Yi,Kim, Yong Pyo 한국입자에어로졸학회 2016 Particle and Aerosol Research Vol.12 No.2

The PMF result was compared with the result from the Chemical Mass Balance (CMB) modelling (Lee and Kim, 2007) to estimate major source of PAHs observed at Seoul from August 2002 to December 2003. Five major sources were estimated from PMF and CMB modellings respectively. Among them three major sources (coal combustion for residential, coke oven and biomass burning) were identified at both models.

안면도에서의 초미세먼지 유기성분 주요 영향원 평가

한상희,이지이,이종식,허종배,정창훈,김은실,김용표,Han, Sanghee,Lee, Ji Yi,Lee, Jongsik,Heo, Jongbae,Jung, Chang Hoon,Kim, Eun-Sill,Kim, Yong Pyo 한국입자에어로졸학회 2018 Particle and Aerosol Research Vol.14 No.4

PMF 수용모델을 사용하여 안면도 측정소에서 2년간 측정한 초미세먼지의 유기성분의 주요 영향원을 파악하였다. 5개 또는 6개의 요인이 최적으로 나타났으며, 6개의 요인이 결과를 더 잘 해석하는 것으로 판단되었다. 이들 요인의 계절별 특성과 영향도 변화를 고려하여 결정한 주요 오염원은 이차유기성분(10.3%), 연소(12.0%), 자연적 생물성 기원(24.8%) 장거리이동식생소각(7.3%), 국지적 생체소각(26.4%), 장거리이동 오염원(19.2%)이다. 안면도 측정소는 배경지역의 특성인 자연적 생물성 기원, 이차유기성분과 장거리이동 오염원의 영향도가 크게 나타나면서도, 비도심의 특성인 국지적 식생소각과 연소 영향도 나타나고 있다. 이는 안면도 측정소에서는 인위적인 영향에 의한 유기성분 특성은 제한적임을 보여준다.

서울시 대기 중 Pinic Acid와 cis-Pinonic Acid의 계절별 농도 변화

전소현(So Hyeon Jeon),이지이(Ji Yi Lee),정창훈(Chang Hoon Jung),김용표(Yong Pyo Kim) 한국대기환경학회 2016 한국대기환경학회지 Vol.32 No.2

Pinic acid (PA) and cis-pinonic acid (CPA) in the atmospheric particulate matter with an aerodynamic diameter of less than or equal to a nominal 10 μm (PM<SUB>10</SUB>) were analyzed for the samples collected during the period of April 2010 to April 2011 at Jongro in Seoul. Both pinic acid and cis-pinonic acid showed higher seasonal average concentrations in summer (PA; 18.9 ng/㎥, CPA; 16.0 ng/㎥) than winter (PA; 5.3 ng/㎥, CPA; 5.9 ng/㎥). They displayed a seasonal pattern associated with temperature reflecting the influence on emissions of α-pinene and β-pinene from conifers and their photochemical reaction. These results were confirmed through Pearson correlation coefficient between CPA, PA and O₃+NO₂, temperature. CPA was only correlated with n-alkanes (C<SUB>29</SUB>, C<SUB>31</SUB>, C<SUB>33</SUB>) from biogenic source. PA was correlated with n-alkanes (C<SUB>29</SUB>, C<SUB>31</SUB>, C<SUB>33</SUB>), n-alkanoic acid (C<SUB>20</SUB>, C<SUB>22</SUB>, C<SUB>24</SUB>) from biogenic source and n-alkanes (C<SUB>28</SUB>, C<SUB>30</SUB>, C<SUB>32</SUB>), and n-alkanoic acid (C<SUB>16</SUB>, C<SUB>18</SUB>) from anthropogenic source. These results showed that the formation of PA and CPA from α-pinene and β-pinene is related to organic compounds from biogenic source. And it is possible for PA to be effected by organic compounds from anthropogenic source.