남북극 과학기지에서의 에어로졸 광학 깊이 변동성

구자호,최태진,조예슬,이하나,김재민,안다현,김준,이윤곤,Koo, Ja-Ho,Choi, Taejin,Cho, Yeseul,Lee, Hana,Kim, Jaemin,Ahn, Dha Hyun,Kim, Jhoon,Lee, Yun Gon 한국입자에어로졸학회 2017 Particle and Aerosol Research Vol.13 No.4

Using the NASA's Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2) reanalysis for aerosol optical depth (AOD) and satellite-observed carbon monoxide (CO) data, we examined the basic pattern of AOD variations over the three polar stations of Korea: Jangbogo and King Sejong stations in the Antarctica, and Dasan station in the Arctic area. AOD values at King Sejong and Dasan station show the maximum peaks in spring, which looks associated with the high amount of atmospheric CO emitted from the natural burning and the biomass burning. Jangbogo station shows the much less AOD compared to other two stations, and seems not strongly affected by the transport of airborne particles generated from mid-latitude regions. All three polar stations show the AOD increasing trend in general, indicating that the polar background air quality becomes polluted.

서울 서대문구 지상 미세먼지 관측 비교

구자호(Ja-Ho Koo),이서영(Seoyoung Lee),김민석(Minseok Kim),박중희(Joonghee Park),전수안(Soo Ahn Jeon),노현석(Hyunsuk Noh),김준(Jhoon Kim),이윤곤(Yun Gon Lee) 한국기상학회 2018 대기 Vol.28 No.4

We performed the comparison of observed PM<SUB>10</SUB> and PM<SUB>2.5</SUB> at both the Yonsei University and the AIRKOREA site in the same Seodaemun-gu district, Seoul from March to December 2016. Generally, the moderate correlations between two sites were found for both PM<SUB>10</SUB> and PM<SUB>2.5</SUB>, but monthly difference was somewhat occurred, implying that the measurement situation is not equally maintained even in a closely located area. Particularly correlations became weaker in June and July, which seems the impact of rainy conditions. Correlations between two stations were higher for PM<SUB>10</SUB> compared to PM<SUB>2.5</SUB>, probably indicating the spatially larger difference of fine mode particle. Monthly mean variation was similar between two sites showing a maximum in March and minimum in August. Diurnal variation was somewhat different: morning peak at Yonsei University but evening peak at the Seodaemun-gu AIRKOREA site, reflecting the difference of local air condition. We also compared the extent of PM<SUB>10</SUB> and PM<SUB>2.5</SUB> according to the local wind speed and direction. In general, the level of particulate matter was high when the wind is blowing from the northwestern area with low wind speed, meaning the high accumulation effect of transported air particles. Findings of this study can be usefully considered for the investigation about the discrepancy of aerosol measurement in a local scale.

스카이라디오미터 관측을 통한 서울 상공 에어러솔의 광학적 특성 분석

구자호(Ja-Ho Koo),김준(Jhoon Kim),김미진(Mi-Jin Kim),조희구(Hi Ku Cho),Kazuma Aoki,Maki Yamano 한국기상학회 2007 대기 Vol.17 No.4

Optical characteristics of aerosols in Seoul are investigated from the measurements of sky radiance by Skyradiometer at Yonsei University from December 2005 to November 2006. Aerosol optical depth (AOD) shows a maximum in June due to weak ventilation and particle growth by aging process and hygroscopic effect. Single scattering albedo (SSA) and Angstrom Exponent (AE) show the lowest value in spring due to the Asian dust. It is clear that coarse mode is dominant in spring and fine mode is dominant in summer from the volume size distribution measured in this study. The explanations on the changes of aerosol loadings are provided through the correlation between AOD and AE, while the pattern of wavelength dependency related to particle size is shown through the correlation between SSA and AE. Backward trajectory analysis by HYSPLIT provides information about origin of aerosol, which allows us to classify the case according to the source region and the path distance. Although the direction of backward trajectory traces back mostly to west, coarse mode particle is dominant in the case of long pathway and fine mode particle is dominant in the case of short pathway. This discrepancy is caused by the regional difference of emitted particles.

국가통계자료를 활용한 조경산업 현황 연구

최자호,윤영관,구본학,Choi, Ja-Ho,Yoon, Young-Kwan,Koo, Bon-Hak 한국조경학회 2022 韓國造景學會誌 Vol.50 No.5

This study carried out to provide the methodology and basic status material of using Korean national statistics needed to find the actual state of the landscape architecture industry. The landscape architecture industry was classified into 'Design', 'Construction Management', 'construction', 'Maintenance & Management', 'Materials', 'Research', 'Education', and 'Administration' areas. In each field, business types were systemized and associated in accordance with Korean standard industrial classification and legislations pertinent to construction. Among them, the business types directly defined in the construction related legislations under the Ministry of Land, Infrastructure and Transport were focused on, and the establishment, association, integration, distribution, duplication, and omission of national statistics were analyzed. As a result, the business types of statistical analysis were selected. In order for commonality of statistical items and minimized error of interpretation, semantic analysis was conducted. Finally, the number of registered business types, the number of workers, and sales were selected. Based on them, the analysis framework applicable to fundamental analysis and evaluation of the actual state of the industry was proposed. Actual national statical data were applied for analysis and evaluation. In 2019, the number of registered business types related to the landscape architecture industry was 12,160, the number of workers by business type was 106,296, and the sales by business type were 8,308.5 billion KRW. The number of registered business types and the number of workers had been on the rise from 2017, whereas the sales had been on the decrease. It is required to come up with a plan for industrial development. This study was conducted with the national statistics established by multiple public institutions, so that there are limitations in securing consistency and reliability. Therefore, it is necessary to establish systematic and consistent national statistics in accordance with 「Landscaping Promotion Act」. In the future, it will planned to research application and development plans of national statistics according to subjects including park and green.

조경매체의 유형별 이용성향 비교

최자호(Choi Ja Ho),구본학(Koo Bon Hak) 인간식물환경학회 2015 인간식물환경학회지 Vol.18 No.3

In 1982, Environmental & Landscape Architecture(ELA), the first off-line printed media in Landscape Architecture, and in 2008, Lafent, on-line internet media, were published. The two media have developed along with the growth of the Landscape Architecture market. The total amount of information in Landscape Architecture area has been increased with knowledge and information-based generation, and its quantitative as well as qualitative needs have grown bigger. This study, therefore, compared and analyzed use orientations of the two media, focusing on the motivation of information use. For the study data, 768 samples collected by survey of subscribers of ELA and members of Lafent were used. As a result of data analysis, the two groups were clearly different in general attributes including gender, age, education, occupation, and the main task. For the main motive of use, ‘acquiring general landscaping knowledge’ for ELA, and ‘news and information in landscape architecture area’ were selected. Thus, the purposes of ‘learning’ for ELA and ‘keeping trend’ for Lafent were a lot. The periods of use of the two media were significantly different. ‘More than 5 years’ and ‘less than a year’ groups of ELA were more than those of Lafent. On the other hand, Lafent which has much shorter history had equal periods of use by category. Like the above results, demand markets are somewhat overlapped between the two journals, but independent areas by demander characteristics and motivational difference exist. Such results are assumed to be the consequences from the information content difference between prints and internet added by difference of general characteristics of demanders. Therefore, it is inferred that the two media needs to establish their direction in the future after considering such differences of demander composition and motivation.

인터넷 환경조경매체의 서비스 품질 및 만족도 연구 - 전문포털사이트 라펜트를 중심으로 -

최자호 ( Choi Ja-ho ),구본학 ( Koo Bon-hak ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2016 한국환경복원기술학회지 Vol.19 No.5

The first objective of this study is to verify diverse responses of users of internet landscape architecture media to service quality. Second, the degree of value and evaluation of service users is understood. Third, the general relation between users` importance/achievement response and overall satisfaction is analyzed. Thus, the general relation between users` response and satisfaction is analyzed. It aims to contribute to the suggestion of basic data for the development of internet media in the landscape architecture area The results of this study are like following. First, there were significant differences in expect and performance responses depending on ‘age` among demographic variables, and ‘academic background` and ‘work` among socioeconomic variables. Second, the influence of service quality on satisfaction was verified as significantly positive(+). Especially, the influence of appearance showing low importance and achievement was the most noticeably shown, so that it was analyzed as the most efficient progress. Third, the determinant of satisfaction was shown differently depending on ‘age` among demographic variables and ‘work` among socioeconomic variables.

데이터 고품질 관리를 위한 검정 알고리즘 최적화 연구

김종립(Kim Jong Rib),구자호(Koo Ja Ho),정지영(Jung Ji Young),최연식(Choi Yeon Sik),김용섭(Kim Yong Seob),유도근(Yoo Do Guen) 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.6

Bromine monoxide retrieval study for application to future GEMS measurements

Heesung Chong(정희성),Jhoon Kim(김준),Ja-Ho Koo(구자호),Gonzalo G. Abad,Raid M. Suleiman 한국기상학회 2019 한국기상학회 학술대회 논문집 Vol.2019 No.05

돕슨 분광광도계(No.124)의 오존 자동관측시스템화

김준(Jhoon Kim),박상서(Sang-Seo Park),문경정(Kyung-Jung Moon),구자호(Ja-Ho Koo),이윤곤(Yun-Gon Lee),Koji Miyagawa,조희구(Hi-Ku Cho) 한국기상학회 2007 대기 Vol.17 No.4

Global Environment Laboratory at Yonsei University in Seoul (37.57˚N,126.95˚E) has carried out the ozone layer monitoring program in the framework of the Global Ozone Observing System of the World Meteorlogical Organization (WMO/GAW/GO3OS Station No. 252) since May of 1984. The daily measurements of total ozone and the vertical distribution of ozone amount have been made with the Dobson Spectrophotometer (No.124) on the roof of the Science Building on Yonsei campus. From 2004 through 2006, major parts of the manual operations are automated in measuring total ozone amount and vertical ozone profile through Umkehr method, and calibrating instrument by standard lamp tests with new hardware and software including step motor, rotary encoder, controller, and visual display. This system takes full advantage of Windows interface and information technology to realize adaptability to the latest Windows PC and flexible data processing system. This automatic system also utilizes card slot of desktop personal computer to control various types of boards in the driving unit for operating Dobson spectrophotometer and testing devices. Thus, by automating most of the manual work both in instrument operation and in data processing, subjective human errors and individual differences are eliminated. It is therefore found that the ozone data quality has been distinctly upgraded after automation of the Dobson instrument.

서울의 기상 조건에 따른 미세먼지와 시정의 상관성

김민석(Minseok Kim),이서영(Seoyoung Lee),조예슬(Yeseul Cho),구자호(Ja-Ho Koo),염성수(Seong Soo Yum),김준(Jhoon Kim) 한국기상학회 2020 대기 Vol.30 No.4

To understand the characteristics of the relationship between visibility and particulate matter (PM) in different meteorological conditions, we investigated the contributions of PM and relative humidity (RH) to visibility in Seoul, South Korea. For the period from 2001 to 2018, both PM and RH show descending trends, resulting in a visibility increase. PM has little impact on the hourly variation of visibility, which could be explained more by the RH variability. Meanwhile, the daily change of PM accounts for daily visibility variation. For the monthly variation of visibility, both PM and RH showed similar influence. The correlation coefficients of PM<SUB>10</SUB>, PM<SUB>2.5</SUB>, and RH with visibility was -0.486, -0.644, and -0.556, respectively, which became higher during the high PM seasons of spring and winter. The correlation coefficient between PM<SUB>2.5</SUB> and visibility was -0.454 for RH higher than 80%, and -0.780 for RH between 40% and 60%. From 2017 to 2018, there were 10 cases of extreme visibility impairment, among which five cases were incurred by high PM pollution, and two cases were by high humidity. Further analysis with PM chemical composition measurements is required to better understand the characteristics of visibility in Seoul.