• 한국도서관연감
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• no.2005
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• pp.33-74
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• 2005

• 한국도서관연감
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• no.2004
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• pp.29-67
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• 2004

• Optical Science and Technology
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• v.4 no.1
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• pp.43-47
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• 2000

• 한국도서관연감
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• no.2006
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• pp.31-86
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• 2006

• 정보화사회
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• s.131
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• pp.8-11
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• 1999

'인터넷 광주', '윈도우 광주', '광주.전남테크노마트'등 인터넷을 통한 시 정보화에 남다른 노력을 기울이고 잇는 광주광역시. 뿐만 아니라 행정정보화를 위해 직원 PC보급률 확대와 함께 전자결재 비율도 90%까지 높인다는 계획을 세우는 등 광주시의 정보화 의지를 고재유 시장을 통해 직접 들어보았다.

• Journal of Environmental Science International
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• v.30 no.3
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• pp.219-234
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• 2021

Industrial emissions, mainly from industrial complexes, are important sources of ambient Volatile Organic Compounds (VOCs). Identification of the significant VOC sources from industrial complexes has practical significance for emission reduction. VOC samples were collected from July 2019 to June 2020. A Positive Matrix Factorization (PMF) receptor model was used to evaluate the VOC sources in the area. Four sources were identified by PMF analysis, including coating-1, coating-2, printing, and vehicle exhaust. The coating-1 source was revealed to have the highest contribution (41.5%), followed by coating-2 (23.9%), printing (23.1%), and vehicle exhaust (11.6%). The source showing the highest contribution was coating emissions, originating from the northwest to southwest of the sample site. It also relates to facilities that produce auto parts. The major components of VOC emissions from the coating facilities were toluene, m,p-xylene, ethylbenzene, o-xylene, and butyl acetate. Industrial emissions should be the top priority to meet the relevant control criteria, followed by vehicular emissions. This study provides a strategy for VOC source apportionment from an industrial complex, which is helpful in the development of targeted control strategies.

• Journal of Environmental Science International
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• v.31 no.5
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• pp.447-456
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• 2022

This study was conducted to propose a way to increase the accuracy and precision of 𝛽-ray measurement equipment. Statistical processing results of equivalent evaluation data from 2016 to 2021 confirmed that the concentration of micro dust measured by 𝛽-ray measurement equipment was higher than that of micro dust sampler. According to quarterly data, it was confirmed that the data from the third quarter (July to September) showed a different trend from other periods, which is assumed to be due to weather conditions. This study indicates that automatic micro-dust measurement equipment evaluation at air pollution measuring stations during the third quarter should be excluded. The evaluation cycle should be changed from once every two years to quarterly. In addition, when the criterion for determining equivalence evaluation falls within the range of the slope and intercept values of the existing trend line, it is necessary to evaluate the R² value together and reduce the slope from 0.9-1.1 to 0.9-1.0.

• Journal of Environmental Health Sciences
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• v.50 no.2
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• pp.93-101
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• 2024

Background: As pollutants caused by non-point sources flow into rivers, river water quality monitoring for fecal pollution is becoming increasingly important. Objectives: This study was conducted to investigate the distribution of microbial communities in the Yeongsangang River water system and sewage treatment plants in Gwangju and to evaluate their antibiotic resistance. Methods: In the experiment, samples were distributed to five selective media at each point and then cultured for 18 to 24 hours. When bacteria were observed, they were sub-cultured by size and shape and identified using MALDI-TOF MS equipment. When identification was completed, 17 types of antibiotic susceptibility tests were performed using VITEK II equipment, focusing on gram-negative dominant species among the identified strains. Results: During the study period, a total of 266 strains were isolated from 39 samples. Gram-positive bacteria were 37 strains in four genera, or 13.9% of the total, and Gram-negative bacteria were 229 strains in 23 genera, or 86.1% of the total. Antibiotic susceptibility testing of 23 strains, the major dominant species, showed that one strain (4.3%) was resistant to only one antibiotic, and two strains (8.7%) were 100% susceptible to the 17 antibiotics tested. The other 20 strains (87.0%) were multidrug resistant bacteria resistant to two or more antibiotics. There were various types of multidrug resistance. Among them, penicillin and cephalosporin series showed the highest resistance. Conclusions: Based on the results of this study, it was found that the bacterial community structure changed according to regional and environmental factors, and it was judged that continuous research such as genetic analysis of antibiotic-resistant bacteria present in natural rivers is necessary.

• Journal of Environmental Health Sciences
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• v.50 no.2
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• pp.146-156
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• 2024

Background: Children who use playground facilities are exposed to potential risks due to the high concentration of heavy metals contained in the finishing materials of facilities in children's playgrounds. Objectives: The purpose of this study was to investigate the concentration of heavy metals in the finishing materials of outdoor children's playgrounds where harmful heavy metals exist in Gwangju and to conduct human risk assessment for children and adults by age to find the risks and limitations. Methods: The bottom and top layers of double-painted paint were peeled off and collected together from the finishing materials of children's play facilities such as slides, swings, and seesaws in 147 children's parks in Gwangju. Heavy metals were analyzed using ICP-OES, etc., and human risk assessment was performed using the concentrations of heavy metals. Results: Based on 1.0E-04, which requires legal regulation, CTE was found to pose a carcinogenic risk for preschool children and no carcinogenic risk for the rest of the age groups. However, RME showed that both men and women of all ages had a carcinogenic risk. For reference, when the carcinogenic risk was based on 1.0E-06, CTE was found to pose a carcinogenic risk from infants to elementary school students, and RME was found to have a carcinogenic risk in all age groups. It was judged that there is a non-carcinogenic risk if the non-carcinogenic risk exceeds 1 based on the hazard index (HI) 1. In CTE, there was no non-carcinogenic risk, and RME for preschooler males (1.49E+00) and females (1.56E+00) were found to have non-carcinogenic risk. Conclusions: This study was meaningful in that it examines the differences in the current management of heavy metals concentration standards and potential carcinogenic and non-carcinogenic risks to the human body and discusses the relationship between heavy metals and human health effects.

• Journal of Food Hygiene and Safety
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• v.34 no.2
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• pp.205-211
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• 2019

This study surveyed mycotoxin contamination in grains and grain products, which were purchased from supermarkets and traditional markets from October 2017 to September 2018 in Gwangju (Metropolitan City). A total of 127 samples including adlay, sorghum, millet, rice, oats, barley, buckwheat, corn as grains, and rice flour, buckwheat flour, roasted barley and corn, as grain products were surveyed. The tested mycotoxins were aflatoxin ($AFB_1$, $AFB_2$, $AFG_1$, $AFG_2$), fumonisin ($FUB_1$, $FUB_2$), ochratoxin A (OTA), and zearalenone (ZON). Mycotoxins were analyzed simultaneously with a UPLC-tandem mass spectrometry method. Fumonisin ($B_1+B_2$) was detected at the range of $4.8{\sim}738.5{\mu}g/kg$ in 35 samples and zearalenone at $8.4{\sim}507.6{\mu}g/kg$ in 20 samples, respectively. No other mycotoxins were detected. Risk assessment was evaluated by using estimated daily intake (EDI) and provisional maximum tolerable daily intake (PMTDI) in accordance with the Joint FAO/WHO Expert Committee on Food Additives (JECFA). When the hazard index (HI) was expressed as $(EDI/PMTDI){\times}100$, the HI (%) showed in the range of 0.0019~1.9526%. Based on these results, mycotoxin concentrations in the grains and grain products were within safe levels.