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송수펌프용량 및 배수지규모에 따른 송·배수시스템의 운영비용 및 체류시간 분석
김강민,최정욱,정동휘,강두선,Kim, Kangmin,Choi, Jeongwook,Jung, Donghwi,Kang, Doosun 한국수자원학회 2017 한국수자원학회논문집 Vol.50 No.12
Recently, various studies have been conducted to optimize the pump operation scheduling and/or the pump/tank size minimizing the system cost of water distribution network. Prior to that, it is important to understand the sensitivity of pump/tank size on the system cost and overall water quality. Here, we have performed the sensitivity analysis to investigate the effect of pump/tank size on the economic cost (construction and operation) and water quality (water age). The analysis was applied on a real, large-scale water transmission network currently operating in South Korea. The results revealed that the pump/tank size has a strong influence on system construction/operation costs. Especially, the tank size has a significant effect on the system-wide water quality. In the case of applied networks, the operating cost decreases as the capacity of the facility increases, but the design cost increases. Using a sensitivity analysis, a suitable range of pump/tank size could be suggested to minimize costs and stabilize the water quality at the same time prior to a system design. 최근 송 배수시스템의 최적 펌프운영과 펌프 및 배수지의 적정용량 산정을 위한 다양한 연구가 진행되고 있다. 시설물의 적정 용량을 선정하기에 앞서 송수펌프 용량 및 배수지규모에 따른 시스템 비용(건설 및 운영비용) 과 시스템 내 수질 변화를 분석하는 과정이 필요하다. 본 연구에서는 민감도 분석을 통해 송수펌프 용량과 배수지의 크기가 실제 시스템의 건설 및 운영비용, 그리고 시스템 전반의 수질에 미치는 영향을 분석하였다. 국내 대규모 지방상수도 시스템을 대상으로 분석을 실시하여 시설물 규모가 비용 및 수질에 미치는 영향을 명확히 파악하였다. 적용 네트워크의 경우, 시설물의 용량이 증가할수록 운영비용은 감소하지만, 설계비용은 증가하는 것으로 나타났으며, 이를 통해 비용최소화와 수질안정화를 동시에 만족하는 시설물의 적정용량 범위를 파악할 수 있을 것으로 판단된다.
〈논문〉 ZnO 나노입자 삽입을 이용한 유기태양전지 효율 향상
김강민(Kangmin Kim),정부영(Booyoung Jung),김정원(Jungwon Kim),김우철(Woochul Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In organic photovoltaics, the thickness of active layer needs to be thick to absorb enough light, whereas the thickness better to be thin for efficient charge separation, i.e., small exciton diffusion length. There is a trade-off between thickness increase for enough light absorption and thickness decrease for efficient charge separation. The optimum thickness is around 100㎚ in previous works[1, 2]. In our research, by adapting the nonmetal ZnO nanoparticles, we scatter the light thereby effectively increase the light absorption. This results in increasing the energy conversion efficiency.
Bacillus thuringiensis C25의 흰날개무늬병 Rosellinia necatrix에 대한 항진균 활성에 관여하는 유전자 특성 및 기능 유전체학적 연구
김강민 ( Kangmin Kim ),이화용 ( Hwa-yong Lee ),배원실 ( Wonsil Bae ),조민 ( Min Cho ),류호진 ( Hojin Ryu ) 한국균학회 2019 韓國菌學會誌 Vol.47 No.4
Biocontrol agents (BCAs) are widely used to protect plants from diverse biotic and abiotic stresses in agricultural and ecological fields. Among the various microbes, many subspecies of the gram-positive genus, Bacillus, have been successfully industrialized as eco-friendly biological pesticides and fertilizers. In the current study, we demonstrated that Bacillus thuringiensis C25 exhibited antagonistic effects on the mycelial growth of Rosellinia necatrix, a fungal phytopathogen. Scanning electron microscopy analysis revealed that B. thuringiensis C25 degraded the cell wall structures of R. necatrix mycelia. In the functional genomic analysis of B. thuringiensis C25, we annotated 5,683 genes and selected the gene sets that potentially encoded fungal cell wall degrading enzymes (CWDEs). The growth inhibition effects on R. necatrix were highly correlated with the transcriptional activity of the mycelial cell wall degrading genes of B. thuringiensis C25. The transcript levels of CWDEs, including CshiA, B, and Glycos_transf_2 genes in B. thuringiensis C25, were enhanced following co-cultivation with R. necatrix. In conclusion, our study suggested that B. thuringiensis C25 could serve as a suitable candidate for controlling R. necatrix and could facilitate elucidating the mechanisms underlying the antifungal activities of BCAs against phytopathogens.