특용작물 경작지 토양의 중금속 함량

장봉기,김두희,권수광 경북대학교 환경과학연구소 1992 環境科學硏究所論文集 Vol.6 No.1

내리막 일반 도로변에서의 공기 중 석면섬유 및 총분진 농도

장봉기,김다운,김대준,안지희,이솔,조봉현,김영지,허은협,이종화 순천향대학교 기초과학연구소 2015 순천향자연과학연구 논문집 Vol.21 No.1,2

We analyzed 60 samples of asbestos fibers and total dust concentration in ambient air at the uphill and downhill of busy roadside in 5 areas in Asan city. Concentration of asbestos fibers in ambient air on downhill side (75.8×10⁻⁶ fiber/cc) was higher than one on uphill (37.3×10⁻⁶ fiber /cc), but, it was not statistically significance different. Both of them were even less than the standard of permission of indoor air quality which is 0.01 fiber/cc. Total dust concentration collected by mixed cellulose esters (MCE) filter (147㎍/㎥) was significantly higher than one collected by poly vinyl chloride (PVC) filter was 81㎍/㎥ (p<0.01). According to traffic, the more passing vehicles, the more total dust concentration. Diesel trucks influence on increasing total dust concentration (p<0.05). Regarding the result, vehicles which have brake linings and pads that contain asbestos fiber are considered that not be driven on the general road anymore. Increasing diesel trucks influence on increasing total dust concentration, and it is caused by respirable particulate in exhaust gas from diesel vehicles.

자동차 정비업소에서의 석면섬유 및 총분진 농도

장봉기,김인화,이상림,한진이,황수민,조봉현,김영지,허은협,이종화 순천향대학교 기초과학연구소 2015 순천향자연과학연구 논문집 Vol.21 No.1,2

We collected total 45 samples of asbestos fibers and total dust concentration by 2 personal sampling and 1 area sampling method from 5 auto repair shops in Asan city for 3 days. The results are as below. Asbestos fibers in the air of 30 samples from auto repair shops by mixed cellulose esters (MCE) filters were  ×   fiber/cc. It is very low, so it is not reach to the standard of permission of indoor air quality which is 0.01 fiber/cc. In 17 of 30 samples, asbestos was detected, but they are lower than quantitative limit. According to sampling media, total dust concentration collected by MCE filters (140.3㎍/㎥) is significantly higher than PVC filters (95.7㎍/㎥), but it is much lower than the occupational exposure limit which is 1st class of dust (2,000㎍/㎥), and there is no difference on number of repairing and number of exchange of brake lining. According to the result, the concentration of asbestos fibers and total dust in auto repair shops are much lower than standard of permission. They are lower than quantitative limit, so it is considered that there are no brake linings or brake pads which have asbestos have been repaired.

석면 슬레이트 지붕을 가진 건물의 건축물 대장과 실제 조사와의 차이 비교

장봉기,이호윤,정예림,심지수,박성미,이종화 순천향대학교 기초과학연구소 2018 순천향자연과학연구 논문집 Vol.24 No.1

The houses that were registered as building register for asbestos slate several decades ago are expected to undergo many changes, including patchwork construction, removal of slate roofs and replacement for other construction materials. Therefore, we are trying to find out the differences between asbestos slate roofs and the actual roof materials to produce data that can help remove the asbestos slate roofs. Based on the building register obtained by applying for information disclosure to Asan City Hall, the existing slate houses in Omok-ri, Upnae-ri, Changam-ri & Hwangsan-ri, and Haengmok-ri, Shinchang Myeon were compared with those of the building register. Additional inquiries were made into unauthorized slate structures that did not exist in the building register. The site's building register indicates that 180 buildings have a slate roof, but the actual research found additional 48 unauthorized slate roof buildings (21.1%). Of the total 180 cases, 39 cases (21.7%) were found to have remained unchanged. 10.0% of slate roofs were used for new purposes and 21.1% were used with steel plates, tin or plastic on the slate roofs. 7.8% of the buildings were replaced with other construction materials after removing the old roof, 17.8% were abandoned as deserted house, and 21.7% were completely demolished. Also, 48 unauthorized slate roof buildings added as a result of the actual inspection were used in patched 20.8% and 16.7% in abandoned buildings. There were many unlicensed slate roofs that were not found in the building register. And, like the building register records, about one-third of the slate roofs were still in use. Most of the houses were modified and used as cattle houses or warehouses. Most of the houses were used for housing purposes by replacing the roofs with other building materials after upgrading or removing slates.

충남 일부지역 학교 석면 건축물 철거 ․ 제거 시 외부 공기 중 석면섬유 농도

장봉기,김민수,윤형준,이예솔,김가진 순천향대학교 기초과학연구소 2018 순천향자연과학연구 논문집 Vol.24 No.2

The purpose of this study was to investigate the asbestos fibers leaking out of the work site when the dismantling and removal of asbestos-containing buildings were carried out according to the current working guidelines. We selected four schools in Chungnam Province, which were constructed using asbestos-containing building materials, and selected five locations each, including entrance of sanitation, negative pressure units outlet, around the workplace (opposite site of negative pressure units outlet), outlet for waste, and school main gate(boundary line of site). In addition, asbestos fibers in external air were collected in total 36 times in the morning and afternoon by a high-intensity pump for two hours during demolition operations, and counted by phase microscope. The average total concentration of asbestos fiber in four schools measured was 0.717 fiber/L, and the geometric mean was 0.624 fiber/L. The highest was 1.857 fiber/L in Yugu-eup, and no one exceeded the 10 fiber/L (0.01 fiber/cc), which is the asbestos fiber exposure standard defined in the nation's indoor air quality control law. The average asbestos fiber concentration at school main gate, which can be considered as background concentration, was the lowest at 0.339 fiber/L, and the average asbestos fiber concentration at the outlet of the negative pressure units were 1.139 fiber/L and it’s average asbestos fiber concentration is significantly higher than other locations (p<0.001). As a result, the concentration of asbestos fiber in the outside air is much lower than the indoor air quality standard in all schools when dismantling and removing asbestos in school buildings. So there is no need to worry about the leakage of asbestos outside of the school buildings. However, it is urgently needed to take measures since few asbestos fibers have been leaked around the negative pressure units outlet.

석면 슬레이트 지붕 가옥과 덧대기 시공한 가옥에서의

장봉기,박태원,이지웅,박성현 순천향대학교 기초과학연구소 2018 순천향자연과학연구 논문집 Vol.24 No.2

We compared asbestos fiber emission reduction effect with indoor and outdoor concentration through the sheathing construction and analyzed the difference in asbestos fiber concentration in air according to the factors affecting asbestos fiber concentration, such as building year, wind speed, and total area of roof. Among houses located in Shinchang-myeon, Asan, Chungnam Province, nine houses with sheathing on top of the asbestos slated roof, which was found to contain chrysotile, and nine houses without sheathing were selected for the comparison. The asbestos fiber samples in the air of the outdoor (bottom of main wind) and the indoor (living room) were collected with a high volume pump (10 L/min) for total 68 times on two different days with different conditions and with two-hours gap, and the number of asbestos fibers was counted by a phase microscope. The total average concentration of asbestos in the air taken from the houses with asbestos slate roof was 3.464 fiber/L and the maximum concentration was 6.727 fiber/L. The total average concentration of the asbestos in the air taken from houses built on the asbestos slate roof was 3.051 fiber/L, and the maximum concentration was 6.292 fiber/L. The asbestos concentration of the houses with layering sheathing on top of an asbestos slated roof was lower than the other ones, but there was no statistically significant difference. Also, there was no place exceeding 10 fiber/L, which is the recommended indoor air quality standard in all samples. When the wind speed was 2.0 m/sec or more, both types of house’s asbestos fiber concentration were significantly high (p<0.01). As a result of multivariate regression analysis of these factors, the asbestos fiber concentration was slightly reduced by layering sheathing construction, but the significant factor was the average wind speed during measurement time, and the higher the wind speed, the higher the asbestos fiber concentration was. As a result, it is urgent to expand the government's continuous interest and support the cost of removing slates as the layering sheathing construction is insufficient to reduce asbestos fiber concentration.

[국방연구개발 50주년, 미래를 기획하라! ⑸] 군수품 품질관리의 새로운 패러다임, 「’19∼’23 군수품 품질관리 기본계획」

장봉기,윤성현,최종수,최수진 한국방위산업진흥회 2020 國防과 技術 Vol.- No.499

Pre-Service Teachers’ Beliefs about and Knowledge of Literacy across the Disciplines

장봉기,Wiens, Peter,Meyer, Carla K.,박소희 국어교육학회 2022 國語敎育學硏究 Vol.57 No.5

This study examined whether elementary and secondary pre-service teachers’ previous enrollment in a literacy across the disciplines (LAD) course and program enrollment (elementary and secondary) influence their beliefs about, and pedagogical knowledge of, LAD. Data from 225 undergraduate students registered in a teaching education program were analyzed using both univariate and multivariate analytic methods. Results indicated that prospective teachers who are currently taking the LAD course or have taken it previously not only harbor more positive beliefs about LAD instruction but also are more knowledgeable in LAD than those who did not take the course. We suggest future inquiry investigating how to develop more effective and authentic formats of LAD courses in teacher education programs.

슬레이트 지붕에 달린 고드름에 함유된 석면농도

장봉기,안다예,이슬기,탁현욱,송수진,조봉현,김영지,이종화 순천향대학교 기초과학연구소 2013 순천향자연과학연구 논문집 Vol.19 No.2

The purpose of this study is to analyze concentration and influence factors of asbestos fibers in the icicle of 19 farmhouses with asbestos cement slate roofing. The mean of concentration of asbestos fibers in the icicle of farmhouses with slate roofing was 1,057.9 fiber/mL. A factors which gave a influence to the asbestos fiber concentration in the icicle by construction year, roof length and total area of slate roofing were not significantly differences. But the number of asbestos fibers contained in icicle showed higher tendency as the year of slate roofing installation at the target farmhouses receded.

메탄생성균에 대한 Wood resin 구성성분의 독성에 관한 연구 ( The Methanogenic Toxicity of Wood Resin Constituents )

장봉기,허준무,손부순,박종안 대한환경위생공학회 1997 대한환경위생공학회지 Vol.12 No.3