감광제/광촉매에 의한 공기오염물질 제거

이재구,안기창,박주형,권정욱 충북대학교 첨단원예기술개발연구센터 1999 연구보고서 Vol.4 No.-

일반 주거환경 또는 재배시설 내의 공기오염물질인 농약 및 병원성 미생물을 인위적으로 제거하기 위해서 자연광 또는 인공광 조건하에서 몇몇 감광제/광촉매에 의한 광분해 촉진효과와 미생물의 살균효과 시험을 수행하였다. 광촉매로는 반도체 물질인 PC-1과 PC-2, 그리고 산화제로 사용되는 PC-3, PC-4, PC-5 및 PC-6과 감광제로 PS-7과 PS-8을 선발하였다. 그리고 시험화합물로는 유기인계 살충제인 dichlorvos와 dicarboximide계 살균제인 procymidone, 환경오염물질인 methyl tert-butyl ether (MTBE)를 선정하였고, 유해 미생물로는 Pseudomonas putida, Phytophthora capsici, Salmonella typhimurium, 및 Escherichia coli를 선정하였다. Dichlorvos의 경우에는 자연광과 인공광 조건하에서, 광촉매 무처리구에 비해 각각의 광촉매가 처리된 모든 처리구에서 4배 이상의 광분해 촉진효과를 보였으나, MTBE의 경우에는 단지 광촉매 PC-1 처리구만 이 광촉매 무처리구에 비해 약 17배 이상의 분해 촉진효과를 보였다. 또한 procymidone의 경우에도 PC-1, PC-6 및 PS-8에 의한 광분해가 약 3배 이상 촉진되었다. 공기 중의 미생물을 제거하기 위한 예비시험에서는 미생물 현탁액에 PC-1을 첨가하고 인공광을 조사함으로서 미생물의 생육이 저해됨을 확인할 수 있었다. 또한 평판배지에 도말된 Salmonella typhimurium은 광촉매 PC-1의 주변에서 미생물 생육이 저해됨을 보였다. 이상의 결과에서 볼 때, 광조건 하에서 이러한 감광제/광촉매를 이용한 기술은 농약을 비롯한 여러 환경 오염물질을 제거하여 재배시설 내의 작업자와 일반 대중의 환경오염원에 대한 노출을 예방할 수 있을 것으로 기대된다. For the artificial removal of the air pollutants such as pesticides, environmental toxicants, and pathogenic microorganisms in the greenhouse or the living environment, the accelerated photodegradation and the biocidal effects by some photosensitizers (PS)/photocatalysts (PC) were tested under the sunlight and/or artificial light. The selected photosensitizers/photocatalysts were the semiconductors (PC-1 and PC-2), the oxidizers (PC-3, PC-4, PC-5 and PC-6), the aromatic ketone (PS-7) and the aromatic amine(PS-8). The test toxic pollutants included the organophosphorus insecticide dichlorvos (DDVP), the dicarboximide fungicide procymidone, and the gasoline additive, methyl tert-butyl ether(MTBE) as the organic pollutants, and Pseudomonas putida, Phytophthora capsici, Escherichia coli and Salmonella typhimuriums as the pathogenic organisms. In the case of dichlorvos, all the photocatalysts selected showed more accelerated photodegradation than the control without photocatalyst under both the sunlight and artificial light. Whereas, only the photocatalyst PC-1 accelerated the degradation of MTBE about 17 times more than the control under both the sunlight and artificial light. Procymidone was much more degraded by the photosensitizer PS-8 and the two photocatalysts (PC-1, PC-6) than by PS-7. In the preliminary experiments to diminish the population of the microorganisms in the air, the photocatalyst-1 added to the microbial suspensions obviously inhibited the microbial growth under the artificial light. The photocatalyst-1 showed the bactericidal activity against Salmonella typhimurium spread on the nutrient broth agar medium. These results suggest that the photosensitizers/ photocatalysts under the light can remove some air pollutants and hence they can be used to reduce the exposure of the workers in the horticultural facilities and/or the public in the environment to the harmful pollutants.

산재지정병원 이용 후 산재요양환자에 대한 만족도 조사

이화평,임형준,주영수,권영준,강희태,김정민,조성식,이태경,윤종완 대한산업의학회 2007 대한직업환경의학회지 Vol.19 No.3

미소균열 탐상을 위한 자기광학소자를 이용한 비파괴탐상법의 제안과 적용

이형노,박한주,庄子 哲雄 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.2

항공기나 대형 플랜트 등의 경년구조물에 있어서 제조 및 설계 혹은 작업환경 등에 의해 발생하는 미소결함은 응력부식파괴로 이어지는 결정적인 원인으로 알려져 있다. 따라서 제조단계에서의 결함의 검출뿐만 아니라 운전개시 후에 있어서도 비파괴검사에 기초를 둔 정기적인 건전성평가가 요구된다. 특히 구조물내의 미소균열 평가는 구조 건전성 평가에 있어서 중요한 과제라 할 수 있다. 자기광학소자를 이용한 비파괴탐상법은 균열부근의 누설자속에 의한 자구 및 자벽의 변화를 이용하여 균열정보를 화상형태로 얻는다. 그러므로 빠른 탐상속도와 결과데이터 해석의 용이 그리고 실시간적으로 탐상결과를 획득할 수 있다는 장점을 지니고 있다. 본 논문은 자기광학소자를 이용한 새로운 비파괴적 탐상법을 제안하고, 본 탐상법을 이용하여 구조물에 존재하는 표면결함의 검출가능성 및 균열깊이의 평가를 실증하였다. 표면결함을 갖는 시험편과 파이프의 내면에 존재하는 피로균열을 대상으로 실험을 실시한 결과, 표면결함의 위치 및 2차원적 형상을 화상형식으로 얻을 수 있음을 증명하였다. 또한 피로시험중의 시험편을 대상으로 균열발생 및 균열진전과정을 평가를 통하여 원격탐상의 가능성을 제시하였다. Micro-defects induced by design and production failure or working environments are known as the cause of SCC(Stress Corrosion Cracking) in aged structures. Therefore, the evaluation of structural integrity based on micro-cracks is required not only a manufacturing step but also in-service term. So we introduce a new nondestructive inspection method using the magneto-optical film to detect micro-cracks. The method has some advantage such as high testing speed, real time data acquisition and the possibility of remote sensing by using of a magneto-optical film that takes advantages of the change of magnetic domains and domain walls. This paper introduces the concept of the new nondestructive inspection method using the magneto-optical film, also proves the possibility of this method as a remote testing system under oscillating load considering application on real fields by applying the method to four types of specimens.

운동거리이상의 정량적 평가

이경무,김재욱,이태수,김헌,황준,이주연 大韓再活醫學會 1998 Annals of Rehabilitation Medicine Vol.22 No.2

관광자의 문화적 경험측정에 관한 연구

李仙熙,全柱炯 문화관광연구학회 2002 문화관광연구 Vol.4 No.2

The evaluation of tourist's cultural experience just has recently discussed an issue for tourism academics. This paper was explored the concept and evaluating method of tourist's cultural experience. Based on the documentary study, this paper was surveyed the tourist's cultural experience through the field research and analyzed regression analysis through SAS program. In this paper I presents the findings the tourist was changed by cultural experience a little bit that includes the understanding of destination, learning culture of destination, experience of unusual culture, cultural change of tourists.

스티렌 현탁 중합반응에서 폭주반응 해석

박형일,신석주,이헌창,장서일,김태옥 한국산업안전학회 2002 한국안전학회지 Vol.17 No.3

The runaway reaction was analyzed experimently and theoretically at the batch styrene suspension polymerization process. In the experiments, the reaction temperature with time was measured at various experimental conditions. According to the experimental results, the risk of the runaway reaction was increased with increasing the ratio of the monomer(styrene, M) to the dispersion medium(water, W), the concentration of the initiator(BPO), and the monomer mass, respectively. And simulation results showed that the runaway reaction was significantly affected by the reaction rate constant of the propagation and that the phenomena of the runaway reaction occurred at about 70% conversion. Also, we found that the runaway reaction did not occur under the operation condition of below 0.5 for M/W, approximate 3 wt% BPO, and below 75℃ for the cooling temperature.

좌새골하정맥을 통하여 중심정맥도관 삽입 3 일 후에 발생한 상대정맥천공과 우흉수 : 증례 보고 A case report

조형찬,손주태,최준영,신일우,이헌근,정영균 대한마취과학회 2002 Korean Journal of Anesthesiology Vol.43 No.4

A 67-year-old male patient had coronary artery bypass graft. Before the induction of general anesthesia, 16 gauge central venous catheter was inserted via left subclavian vein. Initial chest anteroposterior (AP) radiograph showed adequate position, and the central venous pressure measurement through it was satisfactory. This patient's progress was satisfactory, and he was extubated on the second postoperative day. Daily chest AP radiograph had been unremarkable until the third postoperative day, when a right-sided pleural effusion was seen. A day later, the patient complained severe chest pain and dyspnea. We suspected perforation of superior vena cava wall by tip of central venous catheter on the chest computerized tomograph (CT). The injection of radiopaque dye through the central venous catheter confirmed spillage into the mediastinum on the chest CT. Right chest tube was inserted. The patient's condition dramatically improved after chest tube insertion. (Korean J Anesthesiol 2002; 43: 525~530)

대기오염과 천식증상에 의한 응급실내원과의 연관성에 관한 환자교차연구

임형준,이상윤,윤기정,주영수,강대희,조수현 대한산업의학회 2000 대한직업환경의학회지 Vol.12 No.2

Objectives : This study, using case-crossover design, search a relationship between changing levels of air pollutants and asthma attack in asthma patients. Methods : We searched the daily total number of asthmatic patients at hospital's emergency room in Seoul, Korea by investigating total 49 general hospital's emergency room records. Otherwise, We investigated medical records of asthmatic patients at one of the 49 hospitals we have searched. We investigated addresses that they are living, diagnosis, smoking history, whether respiratory infection or not, medications. We analyzed the data by 1:m conditional logistic regression used when matched case-control study is analyzed. Control periods were chosen by bidirectional paired matching technique 7, 14 days before and after case periods. Results : the relative risk of asthmatic attack by 100 ppm ozone increase between June and September were 1.348(95 % CI = 1.010∼1.619). Between November and February, the relative risk by 100 ㎍/㎥ TSP increase, 100ppb sulfur dioxide and nitrogen dioxide were respectively 1,278(1.010∼1.619), 1.237(1.019∼1.502), 1.285(1.006∼1.640). In stratified analysis, the relative risk were significant when the asthmatic patients were children aged 15 years or below, when there were respiratory infection, and when the patients took medications irregularly Conclusions : There was statistically significant association between ambient levels of air pollutants and asthmatic attack. So, we have to exert our efforts to minimize the air pollution effectively, to protect public health from air pollution.

환경상품의 구매 결정 요인에 관한 연구

윤성준,이형주 京畿大學校 附設 韓國産業經濟硏究所 2004 産業硏究 Vol.17 No.-

This study has the research objective of finding the major socio-economic characteristics of environmentally conscious green consumers and then establishing pertinent marketing strategies designed to meet their needs. For this purpose, it investigates the relationship between the green consumers' attitude and their related purchase behavior. As already confirmed by existing literature which verified the gap between green perception and behavior, this study looked into correlations and causations among the perception, intention, and behavior of the green consumers. As a result, the green purchase behavior had relatively high correlation with the green orientation. But it didn't show significant relationship with behavioral intention variable. Also, in terms of the causality between attitude and behavior, the perception toward green consumer was found in high relationship with interest in green issues and willingness to pay extra money for the green products. However, it was found that the purchase experience of the environmental trademarked products was affected by the consumers' interest in environmental issues. Finally, the purchase experience of recycled products was in significant relationship with the credibility toward environmental messages and interest in environmental issues.

자연정화공법에 의한 하수처리장에서 최적 여재 선정

서동철,이홍재,조주식,박현건,김형갑,허종수 한국환경농학회 2003 한국환경농학회지 Vol.22 No.1

농어촌 등에서 소규모로 발생하는 하수를 환경친화적이고 높은 하수처리효율을 유지하면서 하수처리장의 장기간 사용을 위한 최적의 여재를 선정하기 위하며 자연정화공법을 이용한 소형하수처리장치를 호기성조 및 혐기성조로 구분하여 시공한 다음, 하수처리량 및 여재 입경별 수처리 효율을 조사하였고, 호기성조와 혐기성조에서 여재 입경별 하수의 투수속도를 조사한 결과는 다음과 같다. 호기성조 처리수 및 방류수중의 pH 및 EC는 여제입경에 따라서 별 차이가 없었고, 용존산소는 호기성조를 동과한 호기성조 처리수의 용존산소는 큰 폭으로 증가하였으나 혐기성조를 통과한 방류수의 용존산소는 호기성조 처리수에 비해 약간 감소하여 여재입경 및 하수처리량에 따라서 별 차이가 없이 약 2.4~5.1 mg/L정도이었다. BOD,000 및 탁도 처리율은 여재 대(4~10 mm)를 사용했을 경우에도 호기성조 처리수에서 BOD 처리율은 약 91%이상, COD 처리율은 73%이상, 탁도 처리율은 83%이상이었으며, 이들 처리율은 여재입경이 작을수록 증가하였고 모든 조건에서 방류수중의 BOD 처리율은 98%이상, COD 처리율은 91%이상, 탁도 처리율은 98%이상이었다. 여재입경별 총 질소 및 총 인 처리율은 여재입경이 작을수록 약간 증가하였고, 모든 조건에서 방류수중의 총 질소 처리율은 약 45~59%, 총 인 처리율은 약 80~96% 정도이었다. 하수 처리율 및 투수속도를 고려해 볼 때 하수처리장 호기성조의 최적입경은 2~4 mm정도 혐기성조의 최적입경은 0.1~4 mm정도가 적절한 젓으로 사료되었다. 따라서 이러한 조건을 자연정화공법을 이용한 하수처리장에 적용하면 높은 하수처리효율을 유지하면서 하수처리장의 공극폐쇄현상이 일어나지 않아 장기간 운전할 수 있을 것으로 판단된다. An investigation was carried out to evaluate the effects of pebble size on the small-scale sewage treatment apparatus by natural purification method that consisted of aerobic and anaerobic plot pH and EC in both plots varied minimally regardless of pebble size. DO in aerobic plot increased as the pebble size decreased. That in the anaerobic plot was slightly less in comparison with that of the aerobic plot, but varied minimally, 2.4~5.1 mg/L regardless of pebble size. Under all experimental conditions, removals of BOD, COD and turbidity in anaerobic plot were more than 98, 91 and respectively. Removals of T-N and T-P increased as pebble size decreased. Under all experimental conditions, removals of T-N and T-P in anaerobic plot were about 45~59 and 80~96%, respectively. Judging from the above results, it should be considered that the optimum pebble size and pebble permeability in both plot was 2~4 mm and 0.1~4 mm, respectively.