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상수도 관망 내 바이러스 유입 대응을 위한 재염소 시설 설계
김범진,이승엽,Kim, Beomjin,Lee, Seungyub 한국수자원학회 2024 한국수자원학회논문집 Vol.57 No.4
Water distribution system (WDS) is exposed to various water quality incidents during its operation. This study utilized Quantitative Microbial Risk Assessment (QMRA) to analyze the risk associated with potential virus intrusion in WDSs. Additionally, the study determined the location and operation of rechlorination facilities to minimize potential risk. In addition, water quality resilience was calculated to confirm that the chlorine concentration maintains within the target range (0.1-1.0 mg/L) during normal operation. Hydraulic analysis was performed using EPANET, while EPANET-MSX was linked to simulate the reactions between viruses and chlorine. The proposed methodology was applied to the Bellingham network in the United States, where rechlorination facilities capable of injecting chlorine concentrations ranging from 0.5 mg/L to 1.0 mg/L were considered. Results indicated that without rechlorination facilities, the Average risk was 0.0154. However, installing rechlorination facilities and injecting chlorine at a concentration of 1.0 mg/L could reduce the Average risk to 39.1%. It was observed that excessive chlorine injection through rechlorination facilities reduced water quality resilience. Consequently, a rechlorination facility with a concentration of 0.5 mg/L was selected, resulting in a reduction of approximately 20% in average risk. This study provides insights for designing rechlorination facilities to enhance preparedness against potential virus ingress in the future.
김범진,김현수,송현주,정일권,김광하,김병욱,심기남,전성우,정윤진,양창훈,김지현,김태호,김상균,신운건,김선문,한석원,이준행,김경호,Sue K. Park,박병주,이중엽,Jae G. Kim,대한상부위장관. 헬리코박터학회 대한의학회 2016 Journal of Korean medical science Vol.31 No.8
Eradication of Helicobacter pylori using first-line therapy is becoming less effective. Subjects who had been treated for H. pylori infection were prospectively enrolled through an on-line database registry from October 2010 to December 2012. Demographic data, detection methods, treatment indication, regimens, durations, compliance, adverse events, and eradication results for H. pylori infection were collected. Data of 3,700 patients from 34 hospitals were analyzed. The overall eradication rate of the first-line therapy was 73.0%. Eradication failure was significantly associated with old age, concomitant medication, and comorbidity. Regional differences in eradication rates were observed. The most common first-line therapy was proton pump inhibitor-based triple therapy (standard triple therapy, STT) for 7 days (86.8%). The eradication rates varied with regimens, being 73% in STT, 81.8% in bismuth-based quadruple therapy, 100% in sequential therapy, and 90.3% in concomitant therapy. The eradication rate in treatmentnaïve patients was higher than that in patients previously treated for H. pylori infection (73.8% vs. 58.5%, P < 0.001). The overall eradication rate for second-line therapy was 84.3%. There was no statistical difference in eradication rates among various regimens. H. pylori eradication rate using STT is decreasing in Korea and has become sub-optimal, suggesting the need for alternative regimens to improve the efficacy of first-line therapy for H. pylori infection.
화학센서용 다공성 ${\gamma}-Fe_2O_3$ 박막 제조
김범진,임일성,장건익,Kim, Bum-Jin,Lim, Il-Sung,Jang, Gun-Eik 한국센서학회 1999 센서학회지 Vol.8 No.2
PECVD법을 이용하여 $Al_2O_3$ 기판위에 증착된 $Fe_3O_4$박막의 상전이를 통하여 ${\gamma}-Fe_2O_3$ 박막을 제조하였다. ${\gamma}-Fe_2O_3$ 박막의 상전이는 주로 증착온도와 $Fe_3O_4$의 산화과정에 의해 유도되었다. $Fe_3O_4$ 상은 $200{\sim}300^{\circ}C$의 증착온도에서 in-situ로 얻을 수 있었다. 증착온도에 따른 상변화는 없었으며 $250^{\circ}C$에서 증착된 $Fe_3O_4$상이 가장 안정된 상을 나타내었다. ${\gamma}-Fe_3O_3$ 상은 $280{\sim}300^{\circ}C$의 온도범위에서 $Fe_3O_3$ 상을 산화시켜 유도하였다. $Fe_3O_4$ 상과 ${\gamma}-Fe_2O_3$ 상은 같은 spinel구조를 가지고 있으며 공존상으로서 존재함을 알 수 있었다. 또한, $Al_2O_3$에 산화된 ${\gamma}-Fe_2O_3$ 박막은 다공성의 미세구조를 나타내었다. ${\gamma}-Fe_2O_3$ thin films on $Al_2O_3$ substrate were prepared by the oxidation of $Fe_3O_4$ thin films processed by PECVD(Plasma-Enhanced Chemical Vapor Deposition) technique. The phase transformation of ${\gamma}-Fe_2O_3$ thin films was mainly controlled by the substrate temperature and oxidation process of $Fe_3O_4$ phase. $Fe_3O_4$ phase was obtained at the deposition temperature of $200{\sim}300^{\circ}C$. $Fe_3O_4$ phase could be transformed into ${\gamma}-Fe_2O_3$ phase under controlled oxidation at $280{\sim}300^{\circ}C$. $Fe_3O_4$ and ${\gamma}-Fe_2O_3$ obtained by oxidation of $Fe_3O_4$ phase had the same spinel structure and were coexisted. The oxidized ${\gamma}-Fe_2O_3$ thin film on $Al_2O_3$ substrate showed a porous island structure.
알루미늄 스페이스 프레임 적용 차량의 충돌안전도를 고려한 설계 및 해석
김범진(B.J.Kim),김정호(J.H.Kim),김병길(B.K.Kim),허승진(S.J.Heo),강혁(H.Kang),김종명(J.M.Kim) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
To achieve the weight reduction and the high-safety of the automotive body, we developed the aluminum space<br/> frame vehicle with respect to the light weight material. In this study, we performed the axial crush test and 3-point<br/> bending collapse test with aluminum extrusions which applied the structural foam to decide the application<br/> possibility with respect to the automotive crashworthiness. We also designed the collapse initiators to improve the<br/> crash energy absorbing capability and get the stable collapse modes for the front side member. As a result, we could<br/> suggest the direction of safety design for an aluminum space frame vehicle.