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부유형 해양 광생물반응기를 이용한 자외선과 초기 미세조류 접종 농도와의 상관관계 규명
김지훈,박한울,정성균,김수권,김희윤,박용성,홍한마루,이철균,Kim, Z-Hun,Park, Hanwool,Jung, Seong-Gyun,Kim, Su-Kwon,Kim, Hee-Yun,Park, Yong Sung,Hong, Han Ma Roo,Lee, Choul-Gyun 한국해양바이오학회 2015 한국해양바이오학회지 Vol.7 No.2
The purpose of this study was to investigate a relationship between ultraviolet radiation and initial cell density (ICD) of microalgae using a floating marine photobioreactor (PBR). To examine the effect of ultraviolet (UV) radiation in sunlight on biomass productivity as a function of ICD, 0.5-L floating PBRs covered with or without UV cut-off film were placed in an outdoor rectangular tank containing 200 L of water. At the lower ICDs, 0.01 and 0.05 g/L, biomass productivities in the PBRs without UV cut-off film decreased by $278{\pm}21%$ and $222{\pm}3%$ compared with those with the film, respectively. In contrast, the presence of UV cut-off film did not have a significant effect on biomass productivities at the higher ICDs, 0.25 and 1.25 g/L. When the differences in biomass productivity made by the UV cut-off film were plotted against the sum of cell projection area per light receiving area of the PBR, the results revealed that the inhibitory effect of UV on biomass productivity can be negligible when the sum of cell projection area is equal to the light receiving area of the PBR. These results show that photoinhibition caused by UV radiation could be eliminated via operating the PBR with a proper ICD.
플레어 팁 축소 모형을 이용한 Flaring 소음 연구
박성종(Seongjong Park),김종원(Jongwon Kim),김한울(Hanwool Kim),이재훈(Jaehoon Lee),임효남(Hyo-Nam Im),이희성(Heesung Lee),이동연(Dongyeon Lee) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Flare system on offshore production facilities is a safety device for burning and discharging residual gas from oil or gas wells. When flaring occurs, gas is burnt off combining with air on the flare tips, which releases high noise to the surroundings. Therefore, flaring noise has to be strictly controlled to protect workers hearing and countermeasures against the noise are taken into account at the design stage. In general, the study of flaring noise effect on working environment has been dependent on noise calculation or the data provided by flare tip manufacturers. However, the reliability of the noise data is insufficient to take appropriate measures and it is difficult to verify the noise data due to the lack of experience and database. In this study, in order to assess the characteristics of flaring noise, a series of combustion experiments has been carried out using flare tip scale models. Flaring noise are measured at steady-state with intervals of 5.0 m from the center of flare tips with varying the shape, size and gap of the tip nozzle and gas flow rate. In addition, the measured flaring noise levels are compared to calculated results from the commercial software.