화학적 활성화로 제조한 비산회 흡착제의 중금속 흡착 특성

연익준,박상찬 忠州大學校 2005 한국교통대학교 논문집 Vol.40 No.2

This research was performed to investigate the utilization of fly ash as an adsorbent for effective disposal by recycling of fly ash generated from power plant. The adsorption characteristics of this adsorbent was also studied through the analysis of specific surface area, and removal of heavy mctal ions. The specific surface area of the adsorbent added to 10% Na_(2)SO_(4) at 800℃ was about 2.5~4.0 ㎡/g, which was 8~13 times higher than fly ash. The adsorption of activated charcoal and the manufactured adsorbent at 500 Pb^(2+) ㎎/L at pH 3 were 5.29 ㎎/g and 46.5 ㎎/g, respectively. The removal efficiency of the manufactured adsorbent was about 8.8 times as high as that of activated charcoal, but it was lower for Cu and Cd than activated charcoal.

바닥재와 하·폐수 슬러지를 첨가한 점토벽돌제조와 환경안정성 평가

연익준 忠州大學校 2010 한국교통대학교 논문집 Vol.45 No.-

This study is to develop a recycling method for coal ash (bottom ash) and sludge as materials for fabricating clay bricks. In the experiment, the bottom ash used as supplementary material with clay and sewage sludge added as a blowing agent. Characteristics for manufactured clay brick depend on various conditions such as mixture ratio, calcination temperature and time. The results showed that the calcination temperature and time were enough to satisfy the Korean Standard of clay brick at 1150℃ and 1hr, respectively. The compressive strength and water absorption under 9:1 (clay : wethered granite) were 41.0 N/mm2 and 7.4%, which correspond with 1st grade brick standard. When sewage sludge added as blowing agent to fabricate light weight clay brick, the the value of compressive strength and water absorption were 11.12 N/mm2 and 14.5%, which is applicable to 3rd grade brick standard. The leaching test including KLT (Korea Leaching Test) and TCLP (Toxicity Characteristic Leaching Procedure) applied to assessment environmental risk caused by heavy metals. The results showed that concentration of leached heavy metals was lower than allowable level in KLT and TCLP.

소각로 세정기에서 HCl 처리시 TMS 적용

연익준,박상찬 충주대학교 2006 한국교통대학교 논문집 Vol.41 No.-

Semi-dry reactor (S.D.R) system is used to evaluate the effect of spray characteristics for the removal of HCl in the flue gases, and in these experiment, the spray direction was co-current with flue gas and the two-fluid external mixing nozzle was used. And the HCl concentration of the treated flue gas was measured by the combustion gas analyzer (TMS system) on stack. In these experiment, we obtained the maximum removal efficiency of HCl in the incineration flue gas was 96% when atomization quantity of lime slurry was 600ℓ/hr and the Ca/Cl ratio was 3.36 and the slurry droplet size proved 24㎛. Also, the temperature of inlet flue gas into semi-dry reactor have to maintain over 300℃ since lower gas temperature can be caused condensing at the next bag filter.

폐지의 연료화를 위한 페이퍼로그의 제조

연익준 忠州大學校 2012 한국교통대학교 논문집 Vol.47 No.-

In this study, paper-log was manufactured using waste paper to investigate possibility of usage for fuel. To confirm the validity of usage for fuel, specification of manufactured paper-log for RDF(refused derived fuel) was examined and competitive price between paper-log and others was investigated. Also, quality of waste water generated from the process of manufactured paper-log was analyzed for estimating effects on environmental safety. From the results of specification test for RDF, the properties such as heat value and contents of chloride, Hg, Cd, Pb, As, water, ash and sulfur was satisfied with regulation levels of RDF. And the results of water quality generated from the process of manufactured paper-log showed a very low environmental impact. The possibility of usage for substitution of fossil fuels as an source of heating energy for camping and small scale heating seems to be sufficient.

생물막 공정에서 내부 반송율 변화에 따른 생물학적 제거특성

全太誠,延翼俊 충주대 산업과학기술연구소 2000 産業科學論文集 Vol.8 No.-

Removal total nitrogen and total phosphorus in the wastewater is very difficult these days. This study was conducted to investigate the contaminants removal efficiency and the optimal operating parameters by the internal recycle rate(IRR) in the combining A2/O process with fixed film. The average removal efficiency of BOD and COD was 92.5%∼94.6%, 73.9%∼87.0% in RUN 1 and 91.9%~94.7%, 77.7%∼89.0% in RUN 2, respectively. Organic removal efficiency, at two different hydraulic retention time of 10 and 14hr, was similar. At 50% of the internal recycle rate, organic removal officiency was somewhat higher than the other. Total nitrogen(T-N) and total phosphorus(T-P) were removed, highly, at 50% of internal recycle ratec. It could be suggested by this study that the optimum internal recycle rate is 50% and hydraulic retention time is 14hr.

열병합 발전소에서 발생한 탈황석고의 재활용을 위한 특성분석

연익준,조병렬 忠州大學校 2004 한국교통대학교 논문집 Vol.39 No.2

This study is for the purpose of utilizing the FGD gypsum that is produced as a by-product by responding to the calcium carbonate that is injected to eliminate SO₂ from the wet flue gas desulfurization process of the combined heat and power plant. To analyze the chemical characteristics of the FGD gypsum, the chemical formation was examined through an analysis of pH, ICP, XRD and SEM. pH 6.5~6.8 shows as one of the characteristics of the FGD gypsum, as a surface analysis result of XRD, SEM, it shows in a form of calcium sulfate dihydrate

청주공항 주변지역의 항공기 소음 실태 조사

신택수,연익준,김창환,주소영,김광렬 충북대학교 건설기술연구소 2002 建設技術論文集 Vol.21 No.2

The present study is aimed to survey the aircraft noise around Cheongju International Airport, so the survey on the aircraft noise was undertaken from July 7 to July 13, 2002 continuously. As a result, it was found that number of passing aircrafts and WECPNL value per day are different with days of the week. On Wednesday, Saturday, and Sunday the influence of aircraft noise was lower than that on Tuesday and Thursday. The aircraft noise level of three residential areas around the airport was examined. The noise levels of 1.2km, 1.0km and 4.0km away from the airport runway were 74.7, 83.3, 67.7 WECPNL respectively. It was found that there is little affect of noise on residential life in two surveyed areas, but in the other area, noise is so loud that it should be anticipated to be noise damaged area.

연산 증폭기 (TL494) 를 이용한 DC/DC 승압 컨버터 제어 시스템 설계

정구종,이혜연,문경주,정유석,이준영,손영익 明知大學校 産業技術硏究所 2009 産業技術硏究所論文集 Vol.28 No.-

A simple control system using an op Amp (TL494) is presented for a DC/DC boost converter. The DC/DC boost converters have many industrial applications including renewable energy sources and hybrid automobiles. The problem of regulating the output voltage in the presence of load variation has been a research subject of interest for many years. After computer simulations with SimPower system of Matlab Simulink, we have developed the converter system in university laboratory according to the design specifications. Since the chip TL494 has both op Amp and PWM comparator even beginners can easily develop the control system. Experimental results show that the proposed system has some robustness with respect to the load variation.

정신분열병에 대한 리스페리돈의 효과 및 안정성

이민수,김용구,김영훈,연병길,오병훈,윤도준,윤진상,이철,정희연,강병조,김광수,김동언,김명정,김상훈,김희철,나철,노승호,민경준,박기창,박두병,백기청,백인호,손봉기,손진욱,양병환,양창국,우행원,이정호,이종범,이홍식,임기영,전태연,정영조,정영철,정인과,정인원,지익성,채정호,한상익,한선호,한진희,서광윤 大韓神經精神醫學會 1998 신경정신의학 Vol.37 No.1

연구목적 : 본 시험의 목적은 임상시험 시작전에 연구자들을 대상으로 PANSS Workshop을 통하여 PANSS, ESRS에 대한 국내에서의 표준화 작업을 구축하고 새로운 정신병 치료제인 리스페리돈의 효과와 안정성을 재확인하여 리스페리돈 사용에 대한 적정화를 이루는데 있다. 연구방법 : 1996년 4월부터 1996년 9월까지 국내 39개 대학병원 정신과에 입원중인 혹은 증상이 악화되어 입원하는 정신분열병 환자 377명을 대상으로 다시설 개방 연구를 시행하였다. 1주일간의 약물 배설기간을 가진후, 리스페리돈을 8주간 투여하였고, 기준점, 1주, 2주, 4주, 그리고 8주후에 평가되었다. 용량은 제1일에는 리스페리돈 1mg씩 1일 2회, 제2일에는 2mg씩 1일 2회, 제3∼7일에는 3mg씩 1일 2회 투여하였다. 이후 환자의 임상상태에 따라 임의로 증량할 수 있으며, 최대 일일 16mg을 초과하지 않도록 하였다. 추체외로 증상을 조절하기 위한 투약을 허용하였다. 임상증상 및 부작용의 평가는 PANSS(Positive and Negative Syndrome Scale), CGI(Clinical Global Impression) 그리고 ESRS(Extrapyramidal Symptom Rating Scale)을 사용하였다. 연구결과 : 377명중 343명(91%)이 8주간의 연구를 완결하였다. 치료 종결시점인 8주후 PANSS 총점수가 20% 이상 호전된 경우를 약물 반응군으로 정의할때, 약물반응군은 81.3%였다. 리스페리돈에 반응하는 예측인자로는 발병연령, 이전의 입원 횟수, 유병기간이 관련 있었다. 리스페리돈은 1주후부터 PANSS양성, 음성, 및 일반정신병리 점수상에 유의한 호전을 보여 효과가 빨랐다. CGI의 경우도 기준점에 비해 1주후부터 유의한 감소를 나타내었다. ESRS의 경우, 파킨슨 평가점수는 기준점과 비교해 투여 1주, 2주, 4주후 유의하게 증가되었다가 8주후 기준점과 차이가 없었다. Dystonia 평가점수는 1주후만 유의한 증가를 보였으며, dyskinesia 평가점수는 유의한 차이가 없었다. 혈압, 맥박수의 생명징후 및 일반 혈액학 검사, 생화학적 검사, 심전도 검사에서 유의한 변화는 없었다. 결 론 : 이상의 다시설 개방 임상 연구를 통해 리스페리돈은 정신분열병 환자에서 양성증상뿐만 아니라 음성증상 및 전반적인 증상에도 효과적인 것으로 사료된다. 보다 명확한 평가를 위해서는 다른 항정신병약물과의 이중맹검 연구가 필요할 것으로 생각되며, 또한 장기적 치료에 대한 평가도 함께 이루어져야 하겠다. Objective : The purpose of this study was to investigate the efficacy and safety of risperidone in the treatment of Korean schizophrenic patients. Method : This multicenter open study included 377 schizophrenic patients drawn from 39 university hospitals. After a wash-out period of 1 week, the schizophrenic patients were treated with risperidone for 8 weeks and evaluated at 5 points ; at baseline, and 1, 2, 4 and 8 weeks of treatment. The dose was increased from 2mg/day(1mg twice daily) to 6mg/day(3mg twice daily) during the first week and adjusted to a maximum of 16mg/day over the next 7 weeks according to the patient's clinical response. Medication to control extrapyramidal symptoms was permitted. The psychiatric and neurological status of the patients was assessed by PANSS, CGI, and ESRS scales. Results : 343(91%) of 377 patients completed the 8-week trial period. Clinical improvement, as defined by a 20% or more reduction in total PANSS score at end point, was shown by 81.3% of patients. The predictors of response to risperidone were associated older age, shorter duration of illness, fewer previous hospitalization. Risperidone had rapid onset of action ; a significant decrease of the total PANSS and three PANSS factor(positive, negative, general), and CGI was already noticed at the end of first week. For the ESRS, parkinsonism rating scores were significantly increased until week 4 comparing with baseline. Dystonia rating scores were significantly increased until week 1, and dyskinesia rating scores were not significantly changed during the study. Laboratory parameters including vital sign, EKG, hematological, and biochemical values showed no significant changes during the trial. Conclusions : This study suggests that risperidone is generally safe and effective against both the positive and negative symptoms in our group of patients.

The characteristics of municipal solid waste heating value changes in Chung-Ju city

Ik Jun Yeon,Sung Hee Lee,Byung Yeol Cho,Won Jae Lee,Yang Su Han 한국폐기물자원순환학회 2011 한국폐기물자원순환학회 학술대회 Vol.2011 No.1