흡착제를 이용한 수중의 미량이취물질 분석법 개발에 관한 연구

심은기,김은호,곽철,황영기 경남대학교 신소재연구소 1999 論文集 Vol.11 No.-

본 연구에서는 다양한 흡착제들과 추출용매들을 사용하여 이취물질의 효율적인 분석기술을 개발코자 하였다. Geosmin의 흡착능 실험에서는 XAD 수지계통이 월등히 우수한 흡착능을 가진 것으로 나타났으며, 이중에 XAD-2 수지는 시료 100ml 당 300mg을 투여하였을 때 Geosmin 흡착능이 가장 뛰어났다. 추출용매별 Geosmin의 추출능 실험에서 액/액 추출법으로 실험하였을 때 MTBE와 Dichloromethane은 48%, 47%로 거의 비슷한 회수율을 나타내었고, XAD-2 수지를 이용한 고/액추출법으 경우에는 MTBE가 94% 정도로 회수율이 가장 높았고, Dichloromethane 79%, n-Hexane 39%, Diethylether 35% 순으로 나타났다. 염석제(NaCl)를 첨가하였을 경우에 Geosmin의 회수율 실험에서 MTBE를 이용하여 액/액 추출법으로 실험하였을 때 염석제 5g 첨가시 회수율이 75%로 가장 높았고, XAD-2 수지를 사용한 고/액추출법의 경우에는 추출용매 MTBE와 Dichloromethane에 대해 염석제의 투여에 의한 회수율의 증가는 없는 것으로 나타났다. XAD-2 수지의 진탕시간별 Geosmin의 흡착실험에서는 24시간 동안에 Geosmin에 대한 흡착량에는 거의 큰 변화를 나타내지 않았다. 최적의 흡착제는 XAD-2 수지이고 용매는 MTBE가 가장 안정적이고 우수한 것으로 평가되었으며, 액/액 추출법의 경우에 염석제를 첨가하였을 때가 첨가하지 않은경우 보다 회수율이 높게 나타났다. 고상 추출시 분석감도도 용매만 사용하여 추출한 결과보다 2배 가까이 높게 나타나 극미량 함유물질 분석시 전처리 기술로 응용 가능한 것으로 평가되었다. Even if odorous compounds remain very low concentration in water. it cause strong odor. Because Geosmin and most of odorous compound had very low vaporization. those were difficult to analyze with GC/MSD and Purge & Trap. So. we needed pre-treatment method for decreasing amounts of extracting solvents, improving recovery efficiencies and increasing analytical efficiencies. This study developed efficient technology for analyzing odorous compounds, using various adsorbents and extracting solvents. The optimum adsorbent was XAD resins. Especially, SAD-2. XAD-7 and XAD-2010 were superior. but XAD-2 of these and the optimum extraction solvent is MTBE. Other extraction solvents' efficiency is in order of MTBE〉Dichloromethane〉n-Hexane〉Diethylether. The optimum NaCl dosage for increasing efficiency is 5g in liquid-liquid extraction method. The shaking time(0-24hr) has no concern with adsorption efficiency. The optimum adsorbent is SAD-2 resin and extraction solvent is MTBE. Dosing NaCl. adsorption efficiency is increased in liquid-liquid extraction method, but NaCl has no effect on liquid-solid extraction method. In this experimental results. this method will apply to not only Geosmin but other well-known odorous compounds (2-MIB, 1BMP. IPMP, TCA) and algae toxins (Mycrocystin. Anatoxin etc.).

석회석을 이용한 폐광산폐수처리

심은기,김은호,박인수,황영기 경남대학교 신소재연구소 1999 論文集 Vol.11 No.-

석회석을 이용하여 혐기성 처리를 위한 폐광산폐수의 화학적 전처리 특성을 평가하였다. 반응시간에 따른 석회석에 의한 처리시 반응종료 2시간에 pH 3.67이였고 SO42-4.7%, Fe 26%, Al 22%, Pb 18% 및 Mn 8%의 제거효율로서 소석회에 비하여 낮은 처리특성을 보여주고 있다. 석회석의 반응속도는 온도가 증가함에 따라 감소하는 경향을 보였다. 혐기성 석회석 충진층의 경우에 실험기간내 pH는 평균 4.51이였고 SO42-4.5%, Fe 15.3%, Al 20.1%, Pb 23.7% 및 Mn 5.87%의 평균 제거효율을 나타내었다. 혐기성 석회석 충진층은 pH 상승효과가 그다지 없었으며 SO42- 및 중금속제거율 또한 아주 낮아 석회석만으로 폐광산폐수의 처리에는 한계점이 있는 것으로 평가되었다. 그러나, 폐광산폐수를 SRB에 의한 처리시의 전처리 공정으로 활용한다면 강산성인 폐광산폐수를 초기에 pH를 상승시켜 처리계에 높은 알칼리도를 제공함으로서 시스템의 안정화에 기여할 수 있을 것으로 여겨진다. This research was carried out to investigate chemical pretreatment using limestone in treat in g abandoned mine drainage with anaerobic treatment. If treating limestone with abandoned mine drainage. after 2day. pH was increased to 3.67, and So₄^{2-}, Fe. Al. Pb and Mn were removed 4.7%. 26%. 22%. 18% and 8%. respectively. It could be showed that limestone did slowly react with temperature increasing. If treating anaerobic limestone packing column with abandoned mine drainage. for experimental period. average pH was 4.51, and average So₄^{2-}, Fe. Al, Pb and Mn were removed 4.5%. 15.3%. 20.1%. 23.7% and 5.87%. respectively. So, it would not be suitable for abandoned mine drainage. But if utilizing limestone as pre- treatment process for treating abandoned mine drainage with SRB, becaus it did initally neutralize abandoned mine drainage, it could forward to stabilize system.

오존을 이용한 조류제거에 관한 연구

김은호,심은기,박인수,황영기 경남대학교 신소재연구소 1999 論文集 Vol.11 No.-

본 연구에서는 이취를 유발하는 조류가 정수공정에 유입되었을 경우, 대표적인 고도종수처리 공정으로 알려진 오존처리공정에서 오존접촉시 pH, 총유기탄소(TOC), 자외부 발현성물질(UV-254) 및 NH4+-N 등의 변화특성을 조사하였다. pH가 초기에 7.4에서 오존접촉 10분까지는 급격한 pH 저하현상을 보인 후에 pH는 서서히 감소하는 현상을 보이며 오존접촉 100분에는 2.1까지 저하되었다. TOC와 UV-254는 오존과의 접촉시간에 따라 지속적으로 감소하는 경향을 나타내었다. NH4+-N와 NO2--N의 농도에 비해 NO3--N은 비교할 수 없을 정도의 높은 농도 차이를 보이고 있다. 오존접촉시간이 길어질수록 전기전도도 값도 높아지는 것을 알 수 있었다. The objectives of this research were to estimate variation characteristics of pH. TOC. UV_254 and NH₄^{+}-N. etc. if odorous generated algaes flowed into water treatment plant and they contacted with ozone known as typical advanced treatment. Initial pH 7.4 did suddenly decline to early l0min. and then pH drop did almost occur. and pH decreased to 2.1 in ozone contact 100min.. TOC and UV-254 continued to decrease with passed time of ozone contact. NO₃^{-}-N cocentration was much higher than NH₄^{+}-N and NO₂^{-}-N for whole test period. Conductivity showed high as passed time of ozone contact.

우리나라 파프리카 수출단지 및 선과장의 병해충 조사

김기돈,이시원,강은하,신용길,전재용,허노열,이흥식 충남대학교 농업과학연구소 2013 농업과학연구 Vol.40 No.2

The disease and insect were surveyed locally in greenhouse, fruit packing house and store house of 51 farms in 13 towns having purpose of paprika exportation. By analysis, various disease and insect were not only founded locally but more ones detected in farms having old facilities and no natural enemy. We found 15 pathogens such as Fusarium spp., Alternaria solani, Leveilluila taurica, PepMV (Pepino mosaic virus) and TMV (Tobacco mosaic virus) in greenhouse, Fusarium spp. in fruit packing house and Penicillium spp. in store house. We found 15 insects in greenhouse such as Bemisia tabaci, rialeurodes vaporariorum and Myzus persicae in greenhouse, Hylobitelus haroldi in fruit packing house. However, the problem quarantine disease and insect for importation and exportation were not detected in inspection time.

딸기 와인 개발을 위한 최적 발효 조건

김민기, 박미성, 엄은경, 조은혜, 이종수 배재대학교 자연과학연구소 2016 自然科學論文集 Vol.27 No.1

Optimal fermentation condition for development of new strawberry wine were investigated. Commercial yeast, Fermivin was good for brewing of strawberry wine and its optimal addition concentration was also 1%. Maximal ethanol content of strawberry wine was obtained when raw strawberry juice(24 brix) was fermented by 1% Fermivin at 25℃ for 7 days and its antioxidant activity was 78.5%. 새로운 딸기 와인을 개발하기 위한 최적 발효조건을 연구하였다. 시판효모인 페미빈이 딸기와인 제조에 제일 좋았고 1%가 최적 첨가 농도이었다. 딸기와인의 최대 에탄올 생성량은 생딸기주스 (24brix)를 1% 페미빈으로 25℃에서 7일 발효시켰을 때 얻어졌고 이 발효액의 항산화활성은 78.5% 이었다.

개선된 등가 T-S 퍼지 모델 구성 방법

민형기,권성하,정은태 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-

This paper presents an improved method that constructs an equivalent T-S fuzzy model for nonlinear systems expressed by nonlinear differential equations including terms of power series. The proposed method has fewer numbers of the rules than the previous methods as well as exactly expresses nonlinear systems. Moreover, this method can get wider feasible area satisfying the stability conditions than the previous methods. We show the improvement of modeling by comparing the proposed method with two previous methods through an inverted pendulum on a cart.

大形建物 放流水 再利用을 위한 濾過工程의 處理特性

김기태,김은호,김익성,성낙창,임경택,강헌찬 동아대학교 환경문제연구소 1996 硏究報告 Vol.19 No.1

To reuse discharge water in large building, pilot - plant study was conducted experimentally, and the results were as follows ; 1. pH in effluent was lower than it in influent, because organisms was decomposed by microorganisms in filtration tower. Since CO₂ gas was generated, dissolved in water, and then converted into carbonic acid, pH seemed to be influenced. 2. The initial concentrations of COD, BOD and SS were unstable but stable with time. If full - scale plant did unusually operate for a long time, when did pilot - plant, it was known that COD was somewhat influenced but BOD & SS were almost not influences. 3. The production cost of reuse was about 256won/ton. If this subject of study were compared with Pusan, water supply & sewage fee would be 500 - 890won/ton. Therefore, when discharge water is reused to a water closet, there would be no problem at all. 4. If about 50% of wastewater will be reused from daily average generated volume, average 700,000won will be saved monthly. On the other hand, economically a additional tax exemption could be expected there from, and it's more economical. In case of D. University, it's estimated that reuse will be accomodated.

삼각법을 기반으로한 구조화된 격자 캘리브레이션

김은석,주기세,왕지남 한국경영과학회 2002 한국경영과학회 학술대회논문집 Vol.- No.1(1)

Many sensors such as a structured grid pattern generator, a laser, and CCD camera to information have been used, but most of algorithms for a calibration are inefficient memory and experiment data are required. In this paper, the calibration algorithm of a structured grid pattern based on triang is introduced to calculate 3D information in the real world. The beams generated from str pattern generator established horizontally with the CCD camera are projected on the calibr CCD camera observes the intersection plane of a light and an object plane. The 3D infor calculated using observed and calibration data. This proposed method in this paper has advantages such as a memory saving and an e experimental data since the 3D information are obtained simply triangulation method.

하악 절치의 근관계에 관한 연구

임은미,최호영,박상진,최기운 大韓齒科保存學會 2002 Restorative Dentistry & Endodontics Vol.27 No.4

The purpose of this study is to identificate root canal system including ideal access placement, root curvature. canal configuration, incidence of isthmus in mandibular incisors for success of endodontic treatment. 200 mandibular incisors were selected. The ideal access placement was determimed as follows. The teeth were radiographed from mesiodistal and buccolingual views using intraoral dental film. The image was divided into coronal, middle and apical third using the proximal film. Straight line access was determined by measuring the faciolingual canal width and placing points at midway point between the buccal and lingual wall at the junction of the middle and apical third and at the junction of coronal and middle third of the root canal. A line was drawn connecting these two points extending through the crown of the tooth. The point at which the line crossed the external crown surface was recorded as facial, incisal, lingual. Degree of root curvature was determined by Schneider Protractor Method. Both section method and clearing method were used in this study. By section method, 100 mandibular incisors were embedded in clear resin and transeverse serial sectioned at 0.5, 1.0, 2.0, 3.0, 4.0, 5.0mm level from root apex. The resected surfaces were stained by methylene blue and examined under ×40 marginification with a stereomicroscope. By clearing method, 100 mandibular incisors were cleared in methysalicylate after decalcification with 10% nitric acid and evaluated under ×18 magnification with a stereomicroscope. The results were as follows; 1. 29% had the center of the plotted straight-line access facial to incisal edge, whereas 71% had straight-line access at the incisal edge. When incisal wear classified as extensive, the straight-line access was plotted on the incisal edge 95%. When incisal wear classified as slight/none, the straight-line access was plotted on the facial 65.9%. 2. Degree of curvature of main canal was straight or almost straight, and only 10% in buccolingual direction had a degree of curvature greater than 20 degrees and 5.5% in mesiodistal direction had. 3. In section method, canal configuration analysis showed that 51% of the specimen classified as type Ⅰ, 27% as type Ⅱ, 12% as type Ⅲ, 10$ as type Ⅳ. For thoses sections with two canals, the incidence of an isthmus was 26.7%, 64.3%, 79.2%, 96.3%, 97.4%, 97.6% at each level and highest in 3~5mm sections. 4. In clearing method, canal configuration analysis showed that 74% of the specimen classified as type Ⅰ, 11% as Ⅱ, 6% as type Ⅲ, 9% as type Ⅳ. These results suggested that traditional access from lingual should be moved as far toward the incisal as possible to locate and debride the lingual canal and root canal system should be cleaned. shaped completely and obturated three dimensionally for successful endodontic treatment.

생후 0-15 개월 소아의 볼거리 항체가 측정

정은경,나기찬 조선대학교 1993 The Medical Journal of Chosun University Vol.18 No.2

To determine the proper age of the Mumps vaccination, we measured the degree of immunity of 55 children with the age from birth to 15 months to mumps antibody titer by indirect immunofluorescent antibody method. 1) 40.0% (22/55) of the children was positive for mumps Ig G antibody and 3.6%(2/5) was positive for mumps Ig M antibody. 2) By age group, 19 of 31 children with the age from birth to 4 months were positive mumps Ig G antibody, but all the children was negative between 4 month and 12 months. And, 3 of 7 children with the age between 13 months and 15 months were negative for mumps Ig G antibody. 3) One child was positive both Ig G and Ig M antibody. In conclusion, passive mumps antibody began to diappear after 4 months of age, and also began to develop inapparent infection of mumps before 15 months of age, therefore, it is considered that the early mumps vaccination will be required before 15 months of age.