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전재식,김은숙,유승성,오석률,최한영,Jeon, Jae-Sik,Kim, Eun-Sook,Yoo, Seung-Sung,Oh, Seok-Ryul,Choi, Han-Young 한국환경보건학회 2013 한국환경보건학회지 Vol.39 No.5
Objective: This study was carried out for the purpose of identifying major substances contributing to the production of odor and evaluating the characteristic of odors. Methods: Complex odor and 17 odorous compounds were measured at 18 waste transfer stations located in Seoul. Results: The dilution ratio value of complex odor ranged from 4 to 30 times in the boundary layer of 18 waste transfer stations. At 6 measurement points among the 18 waste transfer stations, the dilution ratio values exceeded standards (15 times). When the results were evaluated in terms of their contribution to the formation of malodor, the patterns indicated that the highest concentration values in the residential waste disposal process were of i-valeraldehyde and acetaldehyde, while butyraldehyde and acetaldehyde accounted for a large proportion of odorous compounds from the waste recycling process. Conclusions: It was found that butyraldehyde and acetaldehyde were the primary compounds released from the food waste disposal process. Overall, aldehyde compounds were the greatest contributor to detectable odor intensity emitted at the waste transfer stations.
호흡기 바이러스 감염과 C-Reactive Protein
전재식 ( Jae-sik Jeon ),임인수 ( Insoo Rheem ),김재경 ( Jae Kyung Kim ) 대한임상검사과학회 2017 대한임상검사과학회지(KJCLS) Vol.49 No.1
C-reactive protein (CRP) levels are not generally associated with viral infections. This study investigated the changes in the CRP level caused by an infection from respiratory virus (RV). Nasopharyngeal samples from hospitalized patients with suspected RV infection were used to measure the CRP levels, virus load, virus-virus co-infection, age, sex, and length of hospital stay (LOS). Abnormal CRP levels were detected in 62.3% (3,608 out of 5,788) of all RV-positive samples. The percentage of patients with abnormal CRP levels tended to increase with age. Furthermore, LOS in patients with abnormal CRP levels was significantly longer than that in patients with normal CRP levels. The frequency of elevated CRP levels differed according to the causative virus and the frequency of abnormal levels increased with age. Moreover, LOS was longer in those with abnormal CRP levels. These data provide important insights into the role of CRP levels in RV infection.
천안 지역에서 호흡기 바이러스 감염과 병원 입원기간과의 관계
전재식 ( Jae-sik Jeon ),박진완 ( Jin-wan Park ),김재경 ( Jae Kyung Kim ) 대한임상검사과학회 2017 대한임상검사과학회지(KJCLS) Vol.49 No.1
The length of hospital stay (LOS) for patients with respiratory virus infections has been reported to depend the virus type and infection severity. However, the impact of co-infections remains unclear. Patients with suspected respiratory virus infections, who visited Dankook University Hospital between December 2006 and February 2014, were included to examine the relationship between co-infections and LOS. Multiplex reverse transcriptase-polymerase chain reactions were used to identify the causative viruses. LOS was analyzed with respect to sex, age, virus, and co-infection. During this period, 5,310 out of the 8,860 patients (59.9%; median age, 1.5 years) were respiratory virus-positive. In respiratory virus-positive patients with single, double, and three-or-more infections, the average LOS was 7.3, 6.7, and 6.6 days, respectively. Longer LOS was observed for older patients and those with human coronavirus OC43 infections compared with adenovirus or respiratory syncytial virus A infections. LOS differed significantly according to age, virus type, and co-infection, but not between double and three or more infections.
전재식(Jae Sik Jeon),김덕찬(Dok Chan Kim),이지영(Ji Young Lee) 大韓環境工學會 2007 대한환경공학회지 Vol.29 No.11
본 연구에서는 라돈의 시간적 변화 특성을 분석하고 기여원을 평가하기 위하여 2006년 1월부터 8월까지의 기간 동안 서울지역의 일부 지하철역을 대상으로 라돈 정밀조사를 수행하였다. 승강장에서의 연속 라돈측정 결과, 지하철역 라돈농도는 출퇴근 시간대에 낮게 나타났으며 열차 비운행시간대가 운행시간대보다 더 높은 농도수준을 보여, 라돈의 일변화는 환기시스템 가동시간의 강력한 지배를 받고 있음을 확인할 수 있었다. 또한, 라돈의 계절변화는 겨울 < 봄 < 여름 순으로 높게 나타났다. 역사로 유입되고 있는 지하수의 라돈농도 범위는 6.3∼2,723 pCi/L로 지하수 라돈농도는 승강장 라돈분포에 영향(r = 0.49)을 주고 있으며(p < 0.05), 유입 지하수량 또한 영향(r = 0.69)을 미치고 있음을 확인할 수 있었다(p < 0.001). 지하철이 운행하는 터널과 인접 승강장의 라돈농도는 강한 상관관계(r = 0.85)를 보였다. 지하철역 집수정이 위치한 실내공간의 라돈농도 측정결과, 5개 역사에서 30 pCi/L을 초과하였으며, 최대 농도는 207.1 pCi/L을 나타내고 있어 라돈방사능에 의한 위해 가능성이 매우 높은 것으로 나타났다. In this study, time-series analysis of radon concentrations in Seoul metro subway stations were conducted and their radon sources were traced by close investigations. And it can contribute to establishing the radon reducing policies by which public subway users and relative workers can escape the risk of health. Monitored from January to August in 2006, it showed that the daily variation of radon concentrations is dominated by ventilation. Radon concentration is high in order of summer, spring and winter. Radon concentrations in groundwaters were from 6.3 to 2,723 pCi/L and they showed close correlations with radon distributions in platforms(p < 0.05). And the groundwaters flowing subway stations also have effects on the radon concentrations in platforms(p < 0.001). Radon concentrations in tunnels were higher than radon concentration in adjacent platforms and showed strong correlation(r = 0.85). Radon concentrations of the room in which groundwater drainage is placed were over 30 pCi/L in 5 stations.