PCBs 함유 폐기물 중 함유 이성체 확인 및 정량방법 고찰

김교근 청주대학교 산업과학연구소 2008 産業科學硏究 Vol.25 No.2

This study was investigated the Korean official soil test method and the international various methods for PCBs in PCBs waste containing waste samples. The official waste test method and other two methods(EPA 8082, ISO 61619) were applied to the waste samples using quantification methods of peak matching and individual isomers. The total 5 waste samples were selected by consideration and then analyzed using GC/ECD and GC/MSD.

Acceleration Statistics in Turbulent Channel Flow

K. Yeo,C. Lee 한국전산유체공학회 2003 한국전산유체공학회 학술대회논문집 Vol.2003 No.10

열탈착장치(ATD-400)를 이용한 환경시료 중의 휘발성 오존 전구물질의 분석

김교근 청주대학교 산업과학연구소 2000 産業科學硏究 Vol.18 No.1

The ATD-400/GC(FID) method was performed to analyse the volatile ozone precursors in landfill ambient samples. The average recovery ranges surveyed between 92.2% and 118.8% using 50ppb standard, and %RSD surveyed between 0.29% and 6.95%. This method can be applied to analyse the volatile ozone precursors because the compound can be analyzed the ppb levels. Some peaks were overlapped, therefore the analytical conditions have to studied to get the good peak separation by considering the column length, temperature and flow rate and so on.

어류 중 Dioxin 류의 생물농축

김교근 청주대학교 산업과학연구소 2002 産業科學硏究 Vol.19 No.2

Polychlorinated dibenzo-p-dioxins and furans(PCDDs/PCDFs) are commonly known as dioxins and as one class of the persistant organic pollutants. They are known to accumulated in environmental and biological system. We select a Carassius auratus as a fresh water fish samples in the stream flowing near the municipal solid waste landfill area to investigate the PCDDs/PCDFs concentration. Also, we determined the TEQs of PCDDs/PCDFs.

成人男子의 身體計測과 要因構造分析 : 大邱 ·慶北地域을 中心으로 Centering around Taegu and Kyongbuk areas

洪禎敏,金桂仙 대구효성가톨릭대학교 1993 연구논문집 Vol.47 No.1

The purpose of this study to analyse 58 items including the measured values of 48 items. The analysis was done by calculated values of 2 items and index values of 8 items, by measuring with Martin gauge the physical bodies of 194 male adults (20~50 years old)residing in Taegu and Kyongbuk areas. We can obtain the basic information about the design of costumes for the male adult through this measurement. The result of this study is summarized as follows. 1.It was shown that there was a significant difference (P≤0.001 or P≤0.005) in such items as width, thickness and circumference with increase of their age. 2.The index values by ages indicated that there were an increase their waist width/height, hips circumference/height, chest circumference/height, chest circumference/height, waist circumference/chest circumference, which which means the lareger chest, waist and hips of those male adults with increase of their age. In addition, their flat rate according to the age showed that it increased with increase of their age, while the chest, waist and hips were sylindrical. Also it was shown that their side rate decreased while their thickness of hips was larger than that of chest on teh basis of waist thickness. 3.The correlation between these items indicated that there was closer correlation between height items while their weight correlation to width thickness was middle. Also its correlation to circumference was higher. And there was nearly no its correiation to angle and wasit depth in all items. 4.The factors were analysed on the basis of correlation coefficients. The analysed result is summarized as follows. Factor 1 is thickness and circumference items. Factor 2 is height and length items. Factor 3 is item No. 13, 16 and 35. Factor 4 is item No. 24 and 36. Factor 5 is item No. 18 and 23. Factor 6 is item No. 43 and 44. Factor 7 is item No. 12 and 48. Factor 8 is item No. 47 Factor 9 is item No. 45 and 46. 5.Based on the above result, such items as circumference, length and angle, include in common factors cna be applied to the values by formula when making the basic form of the male adult. However, it is required to apply the directly measured values measured values to the basic form in case of special factor items. Additionally, it is also necessary to continue to promote the study on the physical body of the male adult on the basic of this study.

지면판위 복수장애물 주위 유동장의 가시화 (Ⅱ)

강성환,김계현,이동환 울산대학교 1992 공학연구논문집 Vol.23 No.1

地面板위에 모양이 서로 다른 복수 장애물을 바람방향과 평행으로 배열한 후(Tandem Arrangement)액체4염화 티타늄은 관찰대상 표면에 직접 도색하여 2차원 및 3차원 유동장을 효과적으로 可視化하였다. 유동장의 動的特性, 즉 박리영역의 양상, 방출 후류의 모양이 구조물의 배치모양과 구조물 사이의 간격에 크게 영향을 받고, 慝히 박리영역 내부의 역유가 확인 되었다. Flow patterns around two-bluff cyliders in the tandem arrangements on a gound plane are effectively visualized using liquid titanium tetrachloride. As results, it was observed that the form of seperated lines on the ground plane and the shedding of vortices from two cylinders were varied with both the gap width anda pair of different cylinders.

Conversion of glucose into fructose depending on the properties of hydrotalcites and reaction conditions

( Kyeo Re Lee ),( Sang Goo Jeon ),( Soo Hyun Chung ),( Dae Sung Lee ),( Chang Hyun Ko ),( Jeong-geol Na ) 한국폐기물자원순환학회 2023 I-CIPEC Vol.2012 No.0

토양 시료의 PCBs 분석법 비교

김교근(Kyeo Keun Kim),손기향(Kee Hang Son) 한국환경분석학회 2002 환경분석과 독성보건 Vol.5 No.2

N/A

광물성 혼화재료를 혼입한 고성능 모르타르의 염해 및 화학저항성 평가

이겨레(Kyeo-Re Lee),한승연(Seung-Yeon Han),최성용(Sung-Yong Choi),윤경구(Kyong-Ku Yun) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.5

외부환경에 노출된 콘크리트 구조물은 사용기간 동안 시간의 경과함에 따라 여러 가지 환경적, 화학적, 물리적 요인들이 콘크리트 내부로 서서히 침투 및 확산되면서 콘크리트 초기의 우수한 내구성능을 저하시켜, 열화발생으로 인한 성능저하의 규명과 유지관리에 대한 중요성이 크게 부각되고 있다. 특히, 해안에 근접한 콘크리트 구조물이 동결융해 작용을 받는 경우, 동결융해의 과정에서 콘크리트 조직이 팽창 수축을 반복하면서 콘크리트의 조직이 이완되고 이때, 해수에 존재하는 염화물이온이 콘크리트 내부에 침입하게 되면, 콘크리트 구조물의 철근부식으로 인한 열화를 가속화시키기 때문에 내륙 콘크리트 건축물에 비해 내구성능의 저하가 급속히 진행됨으로 특별한 주의가 필요하다. 본 연구에서는 해수에 접한 콘크리트 구조물의 내구성 확보를 위해 광물성 혼화재료를 혼입한 코팅용 고성능 모르타르의 개발을 목적으로 하고 있으며, 모르타르의 강도 및 내구 특성에 대한 실험적 연구가 진행 되었다. 모르타르에 광물성 혼화재료인 실리카퓸, 메타카올린, 초고분말 플라이애시를 혼입하였다. 혼입률은 실리카퓸과 메타카올린은 각각 3, 7, 10%로 혼입하였으며, 초고분말 플라이애시는 5, 10, 15, 20%로 혼입하여 실험을 진행하였다. 혼화재료 혼입을 통해 제작된 모르타르 시험편을 재령 1일과 28일에 정적 강도시험을 진행하였으며, 재령 28일에 염소이온 침투저항성 시험, 황산 저항성 시험, 염해 저항성 시험 등의 열화 촉진실험을 실시하여 내구 특성을 분석하였다. 촉진 염화물이온 확산 침투 시험 결과를 이용해 국내 콘크리트학회에서 제안하는 방법과 미국, 유럽의 방법으로 내구수명을 평가해 보았다. 메타카올린 혼입 시 모든 규정에서 우수한 내구 수명으로 평가 되었으며, 메타카올린 10%혼입 시 KCI를 기준으로 약 470년의 내구수명이 예측되었다. With the passing of time, exposed concrete structures are affected by a range of environmental, chemical, and physical factors. These factors seep into the concrete and have a deleterious influence compared to the initial performance. The importance of identifying and preventing further performance degradation due to the occurrence of deterioration has been greatly emphasized. In recent years, evaluations of the target life have attracted increasing interest. During the freezing-melting effect, a part of the concrete undergoes swelling and shrinking repeatedly. At these times, chloride ions present in seawater penetrate into the concrete, and accelerate the deterioration due to the corrosion of reinforced bars in the concrete structures. For that reason, concrete structures located onshore with a freezing-melting effect are more prone to this type of deterioration than inland structures. The aim of this study was to develop a high performance mortar mixed with a mineral admixture for the durability properties of concrete structures near sea water. In addition, experimental studies were carried out on the strength and durability of mortar. The mixing ratio of the silica fume and meta kaolin was 3, 7 and 10 %, respectively. Furthermore, the ultra-fine fly ash was mixed at 5, 10, 15, and 20%. The mortar specimens prepared by mixing the admixtures were subjected to a static strength test on the 1st and 28th days of age and degradation acceleration tests, such as the chloride ion penetration resistance test, sulfuric acid resistance test, and salt resistant test, were carried out at 28 days of age. The chloride diffusion coefficient was calculated from a series of rapid chloride penetration tests, and used to estimate the life time against corrosion due to chloride ion penetration according to the KCI, ACI, and FIB codes. The life time of mortar with 10% meta kaolin was the longest with a service life of approximately 470 years according to the KCI code.

[환경] Headspace/GC/MS를 이용한 폐기물중 휘발성 유기화합물의 분석

김교근(Kyeo-Keun Kim),신선경(Sun-Kyoung Shin),주도원(Do-Weon Ju) 한국분석과학회 2000 분석과학 Vol.13 No.1