NiO/MoO₃/MoS₂의 공탑속도에 따른 유동화 특성

이재랑,전성민,이강산,이관영,김광득,박영옥,Lee, Jae-Rang,Hasolli, Naim,Jeon, Seong-Min,Lee, Kang-San,Lee, Kwan-Young,Kim, Kwang-Deuk,Park, Young-Ok 한국입자에어로졸학회 2017 Particle and Aerosol Research Vol.13 No.2

실험실 규모의 유동층 반응기(Length=0.25m, Diameter=0.05m)에서 고부가가치 물질인 희유금속 산화물 $NiO/MoO_3/MoS_2$의 공탑속도에 따른 최소유동화 속도 및 압력손실 경향을 확인하였다. 시료의 L/D 1, 2, 3 변화에 따른 Superficial gas velocity 0.07~0.45 m/s 범위에서 $NiO/MoO_3/MoS_2$의 L/D 1, 2, 3에서의 평균 압력손실은 Decreasing flux에서 290~1952 Pa, Increasing flux에서 253~1925 Pa로 나타났다. Wen이 제시한 이론값과 실험데이터를 비교해본 결과, 0.021~0.36배 차이나는 것을 확인하였다. 이번 결과를 통하여, 희유금속 산화물을 실제 현상에서 적용 가능한 운전조건을 결정할 수 있었다. This study identified the loss of minimum fluidization velocity and pressure in accordance with the superficial velocity of $NiO/MoO_3/MoS_2$, a rare metallic oxide and high value-added material in the lab-scale fluidized bed reactor (L=0.25 m, D=0.05 m). The average pressure loss in L/D 1, 2, and 3 of $NiO/MoO_3/MoS_2$ within the scope of superficial gas velocity between 0.07 and 0.45 m/s based on the L/D 1, 2, and 3 of the specimen was shown to be 290~1952 Pa at decreasing flux and 253~1925 Pa at increasing flux. The comparison between the theoretical value proposed by Wen and the test data showed a difference between 0.021~0.36 magnification. Based on these results, this study was able to determine the operation conditions where rare metallic oxides could be applied in real phenomena.

입자상물질과 VOCs 동시제거 실증장치에서 자동차 페인트 부스 발생 paint aerosol과 VOCs의 동시제거 성능 특성

이재랑,전성민,이강산,김광득,박영옥,Lee, Jae-Rang,Hasolli, Naim,Jeon, Seong-Min,Lee, Kang-San,Kim, Kwang-Deuk,Park, Young-Ok 한국입자에어로졸학회 2016 Particle and Aerosol Research Vol.12 No.4

The purpose of this study is to determine the performance characteristics of the paint particulate and volatile organic compounds(VOCs) simultaneous removal from the spraying paint booth in the laboratory and real site by sticky paint particulate and VOCs simultaneous removal demonstration unit. The sticky paint particulate and VOCs simultaneous removal unit is composed of the horizontal type pleated filter modules and the zig-zag type granular activated carbon packing modules. The test conditions at the laboratory are $50.15g/m^3$ of average paint aerosol concentration and 300 ppm of VOCs concentration which were same as the working conditions of spraying paint booth in the real site. But, the demonstration conditions at the real site are varied according to the working condition of spraying paint booth for the kind of passenger car bodies. The test results at the laboratory obtained that 99% of total particulate collection efficiency at 0.62 m/min of filtration velocity and 84% at 1.77 m/min of filtration velocity. The VOCs removal efficiencies are 97% at $3500hr^{-1}$ of gas hour space velocity and 59% at $10,000hr^{-1}$ of gas hour space velocity. In the real site test, the average removal efficiency of PM10 was measured to be 99.65%, the average removal efficiency of PM2.5 was 99.38%, the average removal efficiency of PM1 was 98.52%, and the average removal efficiency of VOCs was 89%.

소형 자동차 페인트 도장부스에서 발생하는 점착성 paint aerosol 처리장치에서 제거성능

이재랑(Jae-Rang Lee),Naim Hasolli,전성민(Seong-Min Jeon),손종렬(Jong-Ryeul Sohn),이강산(Kang-San Lee),박영옥(Young-Ok Park) 한국대기환경학회 2015 한국대기환경학회지 Vol.31 No.1

대학생에서의 담배 가격과 금연의지와의 관계

이욱진(Lee Wook-Jin),이승준(Lee Seung-Jun),이재랑(Lee Jae-rang),이정명(Lee Jung-myung),이주형(Lee Joo-hyoung),박은철(Park Eun-choel),이후연(Lee Hoo-yeon) 한국역학회 2003 Epidemiology and Health Vol.25 No.2

Background: The smoking rate of adult male is 68.2% in Korea and that of adolescent and women has risen recentlyMinistry of Health and Welfare plans to raise the price of cigarettes by 1,000 Won per pack this year in hopes of securing funds to aid the underprivileged and discourage excessive smoking. . In this study, we tried to find the relationship between tobacco price increase and willingness to quit smoking among university students, and the factors associated with willingness to quit smoking. Method: The data were collected by questionnaire survey from 225 university students living in Seoul. The questionnaire contained items on age, sex, smoking history, economical status and the intention to quit smoking when the tobacco price be raised. Result: The proportion of smokers who has the intention to quit smoking if the price of tobacco be raised by 3,000 Won was 46.2%. The factors associated with willingness to quit smoking were age of initiating smoking, opinion for price of cigarette, self efficacy scores, current plans to quit smoking, and viewpoint of changes in the rate of smokers. Conclusion: The results showed that tobacco price rises will increase willingness to quit smoking among university students.

2세 남아에서 발견된 들깨 알레르기 1례

송지은 ( Ji Eun Song ),이재랑 ( Jae Rang Lee ),박여훈 ( Yeo Hoon Park ),홍정연 ( Jung Yeon Hong ),손선미 ( Sun Mi Son ),김경원 ( Kyung Won Kim ),고홍 ( Hong Koh ),정기섭 ( Ki Sup Chung ),손명현 ( Myung Hyun Sohn ),김규언 ( Kyu Ea 대한소아알레르기호흡기학회(구 대한소아알레르기 및 호흡기학회) 2009 소아알레르기 및 호흡기학회지 Vol.19 No.1

저자들은 아토피 피부염이 있으며 난백, 땅콩 등에 알레르기가 있는 유아에서 이유기에 처음으로 섭취한 들깨에 의해 심한 소화기 증상이 발생했던 들깨 알레르기 환아 1례를 경험하였기에 들깨 단백분석 및 환아 혈청 내 특이 IgE와의 immunoblot 분석과 함께 보고하는 바이다. Even though perilla is one of the most commonly consumed grain in Asia including Korea, perilla allergy is rare. A 2 year-old boy had erythematous popular urticaria on his whole body, as well as vomiting and diarrhea after ingestion of boiled perilla. On the second day of admission, old blood clots in the vomitus and blood tinged stool were shown. He underwent an esophago gastro duodenoscopy which showed a large duonenal ulcer. After treatment, his general condition improved. We report a case of perilla allergy with brief review of related literature. [Pediatr Allergy Respir Dis(Korea) 2009;19:78-83]

소아 만성 두통 환자에서의 Magnetic Resonance Angiography 결과 분석

김승(Seung Kim),이재랑(Jae Rang Lee),윤춘식(Choon Sik Yoon),이영목(Young-Mock Lee),이준수(Young-Mock Lee),김흥동(Heung Dong Kim) 대한소아신경학회 2008 대한소아신경학회지 Vol.16 No.2

목 적 : 두통은 소아 인구에서 매우 흔하고 환자들의 삶의 질에 큰 영향을 끼칠 수 있는 질환으로, 이의 발생 기전에 대하여 많은 가능성이 제시되고 있다. 저자들은 뇌 MRA를 통해 만성 두통 소아 환아에서 뇌혈관 이상과의 연관성을 알아보고자 하였다. 방 법 : 2006년 1월부터 2008년 4월까지 만성 두통을 주소로 내원한 320명의 소아 환자 중 1달에 15일 이상, 3개월 이상 증상이 지속되어 만성 매일 두통의 진단에 부합되는 환아 중에서 1년 이상 증상이 지속되는 경우에 뇌 MRI 및 MRA를 시행하였으며, 정상뇌 MRI 소견을 보였던 44명 환자의 뇌 MRA 결과 및 의무기록을 후향적으로 분석하였다. 결 과: 뇌 MRA를 시행한 총 환자수는 44명이었으며. 그 중 8명(18.2%)에서 뇌혈관의 이상 소견이 발견되었다. 이상 뇌혈관 소견에는 편측 A1 형성저하 5례(11.4%), 편측 A1과 P1 형성저하 1례(2.3%), 편측 척추동맥 형성저하 1례(2.3%), 모야모야병 1례(2.3%)가 있었다. 44명의 환자 중 21명은 두통만을 호소한 환아였고, 나머지 23명은 두통과 함께 다른 신경학적 증상을 호소하는 환아였는데, 이 두 군 사이에 뇌 MRA 이상 빈도는 통계학적으로 유의한 차이를 보이지는 않았다. 결 론 : 소아 만성 두통 환아에서의 뇌혈관 이상 소견이 병인 가능성과 위험 요소로 제시될 수 있으며, 성인으로 성장하는 장기적인 과정에서 뇌혈관 변이와 신경학적 증상 사이의 연관성에 대한 전향적인 연구가 필요할 것으로 사료된다. Purpose : Headaches occur frequently in the pediatric population and have a significant impact on their quality of life. Several mechanisms are currently thought to contribute to headache pathogenesis. Our aim was to investigate the association of chronic headache in children and cerebral vascular anomaly by performing brain magnetic resonance angiography(MRA). Methods : We retrospectively reviewed medical records and MRA of 44 patients with chronic headache who visited the pediatric clinic of Young Dong Severance hospital from January 2006 to April 2008. Results : The number of enrolled patients was 44. Eight(18.2%) of them showed abnormal brain MRA findings. Abnormal findings included 5 cases of unilateral A1 hypoplasia, 1 case of unilateral vertebral artery hypoplasia, 1 case of unilateral A1 and P1 hypoplasia, 1 case of Moyamoya disease. Among the 44 patients, 21 had complained only headache and 23 had complained other neurological symptoms with headache. The ratio of abnormal MRA between the two groups showed no statistical difference. Conclusion : Vascular anomaly could be a possible pathogenesis and risk factor in chronic headache in children. Further investigation and long term follow up is needed.

Changes of Soil-Emission Gases and Microbial Diversity by Different Fertilizers Supplemented after Application of Livestock-Manure Compost in Greenhouse Soil

강항원,고지연,박향미,이재생,강위금,박경배,Kang, Hang-Won,Ko, Jee-Yeon,Park, Hyang-Mee,Lee, Jae-Saeng,Rang, Ui-Gum,Park, Kyeong-Bae 한국토양비료학회 2000 한국토양비료학회지 Vol.33 No.1

축분퇴비의 시용시 보충하는 비종에 따른 하우스 내부의 가스 발생양상과 미생물의 다양성을 구명하여 가스피해 정감 및 토양건전성 유지를 위한 기초자료를 얻고자 식양질 하우스토양에 축분퇴비의 시용량을 고추의 기준시비량과 퇴비에 함유된 인산함량을 기준하여 정식 2주전에 시용하고 부족한 질소성분을 요소와 완효성U/F복비로 보충처리하여 4월부터 8일 까지 재배하였다. 암모니아 및 아민류 가스는 정식초기에는 다소 낮은 농도로 배출되다가 정식 후 27일경에 peak를 보인 후 급격히 감소하여 33일경 이후에는 검출되지 않았으며, 평균농도는 요소구에 비하여 완효성U/F복비구가 암모니아 42%, 아민류 85%감소되었다. 이산화탄소는 요소구 1,200~3,200, 완효성U/F복비구 $900{\sim}2,650mg\;{\ell}^-$의 범위로 배출되었고, 평균농도는 요소구 2,260, 완효성U/F복비구 $1,590mg\;{\ell}^-$이었다. 세균, 방선균, B/F비, A/F비, 암모니아 및 아질산산화세균, 질산환원균 등의 밀도는 재배기간이 경과됨에 따라 완효성U/F복비구에서 더 높았으나 사상균 수는 요소구에서 많았고 탈질균은 비슷한 경향을 보였다. 조사한 6종 미생물 밀도의 백분율을 이용한 다양성지수는 0.10~0.35 범위로 재배기간이 경과함에 따라 감소하는 경향이었으며, 처리간에는 완효성U/F복비구가 요소구에 비하여 더 높았다. This study was conducted to gain basic data for alleviation of gas emission and conservation of healthy soil environment by investigating an aspect of gas emission and microbial diversity due to the supplement of different fertilizers after application with a livestock manure compost in greenhouse soils. Green pepper was cultivated in clay loamy soil from April to August. Before planting, a livestock manure compost was applied with $741mg\;ha^{-1}$ on the basis of the phosphate content contained in compost. And then, deficient nitrogen for cropping was supplemented with either quick-acting fertilizer of urea or a controlled slow release fertilizer made from urea formaldehyde(U/F). $NH_3$ and R $NH_2$ gases emitted from soil showed a low concentration in the early stage but a maximum in 27 days after planting, then decreased rapidly and not detected after 33 days. Their average concentrations were 42% and 85% lower in the treatment of slow release fertilizer than that of urea fertilizer, respectively. $CO_2$ gas emitted under urea fertilization was ranged from 1,200 to $3,200mg{\ell}^{-1}$ and that in slow release fertilizer was $900{\sim}2,650mg\;{\ell}^{-1}$. The average concentration of urea treatment was $2,260mg{\ell}^{-1}$ and 30% higher than that of slow release fertilizer. The treatment of slow release fertilizer with the lapse of cropping time populated larger in numbers of bacteria, actinomycetes, nitrate bacteria and nitrate reduction bacteria, and ratios of bacteria and actinmycetes to fungi than that of urea fertilizer. But the number of fungi was higher in the treatment of urea fertilizer and denitrifying bacteria showed a similar trend in both treatments. The microbial diversity index, which calculated with numbers of 6 species of microorganisms, was decreased with increasing of growing stage in the range of 0.1 to 0.35 and that was higher in the tratment of slow release fertilizer than urea.