• 한국분무공학회지
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• 제19권3호
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• pp.130-135
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• 2014

This study was performed to reveal the relationships between various gas supply conditions including inlet numbers and positions for Photobioreactor. To do that, this study was installed the experimental apparatus. All experiments were performed for the cases with 1, 2, 3, and 4 inlets and for gas flow rate of 4~8 lpm. Through the experiments, this study showed that the case with 3 or 4 inlets could reduce about 50% of the pressure loss head for all gas path than that of one inlet base case. So, these results can be used as basic data to design the gross or multiple photobioreactor.

• KSBB Journal
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• 제26권6호
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• pp.561-564
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• 2011

In this study, we carried out the development of high performance photobioreactor, which can be used to develop the biological $CO_2$ fixation technology as well as the renewable biofuels, the microalgae Botryococcus braunii. When B. Braunii was cultured in Anti-biofouling photobioreator, growth rate of it showed about 3 times higher than that of bubble column photobioreactor at the same conditions. In case of photobioreactor without bead, after 3 days culture time, biofouling occur rapidly in wall of the photobioreactor. However, with bead 5% (V/V), biofouling do not occur all experimental days.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 추계학술대회 논문집
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• pp.957-958
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• 2012

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.1523-1524
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• 2011

• 한국정밀공학회지
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• 제30권2호
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• pp.154-163
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• 2013

Adhesive bonding and plastic welding have been widely used to join two plastic materials together. The goal of this paper is to determine a proper joining technology of a pair of flat panel (FP) photobioreactor (PBR) case. The material of the FP PBR case is polycarbonate (PC) plate. Two types of adhesion, including acryl adhesive and two-part epoxy adhesive, as well as two types of plastic welding technology, including ultrasonic welding and thermal welding, are employed for joining of PC plates. In order to influence of the adhesion and welding conditions on the joining characteristics of the PC plates in operational conditions of the FP PBR case, the morphology in the vicinity of the joined region as well as the water and pressure resistance characteristic are investigated. In addition, the variation of the bonding strength of the joined region and deformation behaviors in the vicinity of the joined region according to the adhesion and welding conditions is examined via the lap-shear test. From the results of basic experiments, proper joining technologies are chosen. Using the chosen joining technologies, the FP PBR case are fabricated to perform full-scale durability experiment. The results of the full-scale durability experiment have been shown that the chosen joining technologies can be applicable to fabricate the FP PBR case.

• 한국정밀공학회지
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• 제29권9호
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• pp.946-957
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• 2012

The objective of this paper is to investigate into the development of a thin flat panel photo-bioreactor case with characteristics shapes. The thin flat panel photo-bioreactor case was designed to be manufactured from a plastic thermoforming process. A proper design with a relatively high rigidity was obtained through the structural analyses for different designs of the photo-bioreactor case. The thermoforming analyses were performed. From the results of the thermoforming analyses, a proper forming condition and the formability of the designed plastic photo-bioreactor case were estimated. The thermoforming moulds for the flat panel photobioreactor cases were manufactured. The thermoforming experiments were performed to examine the manufacturability of the designed flat panel photo-bioreactor cases. From the results of the thermoforming experiments, it was shown that thin flat panel photo-bioreactor cases with characteristic shapes can be manufactured from the designed thermoforming mould and process.

• 청정기술
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• 제6권1호
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• pp.71-78
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• 2000

본 연구는 광합성 균주인 C. thiosulfatophium을 이용한 황화수소의 생물학적 탈황공정시 광에너지를 저감시키기 위해 광원의 종류와 광조사 유형에 따른 탈황효율을 조사하였다. 광에너지를 저감시키기 위해서는 반응기내 광분산 효율을 극대화시켜야 한다. 광이용효율을 높이기 위해, 세균농도와 생성부산물의 증가에 의한 빛의 산란과 흡수가 세균성장에 미치는 영향에 관한 연구와 미생물이 필요로 하는 파장의 빛을 최대로 공급하기 위해 LED, 백열등, 태양광 등을 이용한 광원의 최적화 연구, 그리고 외부조사형 광반응기의 광투과 효율의 한계를 극복하기 위한 광섬유를 이용한 내부조사형 광반응기에 대한 연구를 수행하였다.

• 한국정밀공학회지
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• 제31권1호
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• pp.21-28
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• 2014

Recently, several researchers made their endeavor to manufacture the photobioreactor(PBR) with characteristic shapes form vacuum and blow forming process. Hence, behaviors of the transparent polycarbonate(PC) plate in the high temperature region should be examined to obtain the desired PBR case via vacuum and blow forming processes. The aim of this paper is to investigate tensile behavior of PC plate in the high temperature. Various tensile tests were performed using high temperature tensile testing machine. The influence of tensile speed, thickness and ambient temperature on tensile behavior in the high temperature was examined. The flow stress and tensile strength augmented when the tensile speed increased. In order to obtain proper flow curves with strain rate effects for different temperature of specimen, G'sell-Jonas model was adopted. The material constants of the G'sell-Jonas model were estimated. The flow curves of the PC plate considering the tensile speed, specimen thickness and temperature were obtained.

• 한국지반환경공학회 논문집
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• 제13권2호
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• pp.41-47
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• 2012

본 연구는 담수미세조류의 일종인 클로렐라를 적색 발광다이오드를 이용하여 효율적으로 배양하기 위한 조건을 찾기 위해 수행되었다. 클로렐라 배양에 최적인 광량을 찾기 위해 광량을 조절하여 클로렐라가 포함된 반응기에 각각 조사하여 성장속도 및 셀농도를 측정하였다. 적색파장 사용 시, 광량이 증가할수록 성장속도는 광량에 비례하여 증가하였으나 셀농도는 지속적으로 감소하였다. 공기 공급에 따른 성장특성을 살펴보기 위해 반응기에 미세공기를 연속적으로 주입하였는데, 반응속도 및 셀농도는 공기를 주입하지 않은 경우에 비해 2배와 10배 증가함을 알 수 있었다. 고농도의 이산화탄소 주입의 경우에는 배지의 pH가 3이하로 저하되어 클로렐라의 성장이 감소하는 것을 알 수 있었다. 본 연구를 통해 클로렐라를 효과적으로 배양하기 위해서는 적색파장의 발광다이오드를 광원으로 사용하고 반응기에 공기를 연속적으로 주입하는 것이 효과적임을 알 수 있었다.