• Journal of Advanced Marine Engineering and Technology
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• 제25권5호
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• pp.1017-1024
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• 2001

• Journal of Advanced Marine Engineering and Technology
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• 제35권5호
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• pp.661-666
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• 2011

최근 해양교통시설물의 전력원으로 태양광발전과 파력발전을 이용한 하이브리드 발전 형태에 대한 연구가 진행 중이다. 그러나 해상에서 장기간 해양교통시설물을 운용할 경우 해양교통시설물 수주의 유입구에 해조류 증착 문제가 발생하였다. 이러한 문제의 해결을 위해 AFS (Anti-Fouling System)의 연구가 진행되고 있다. 단일채널 방식의 AFS를 이용하였으나 구리 전극봉의 이온화가 각기 다르게 되어 구리 전극봉의 교환주기를 앞당기는 문제가 발생하였다. 본 논문에서는 다채널 전류제어 방식을 이용한 해양 교통시설물용 AFS를 제안하고 시뮬레이션을 하였다. 시뮬레이션의 신뢰성을 높이기 위하여 실제 해양교통시설물의 전극봉 용해결과를 시뮬레이션 프로그램에 반영하였다. 시뮬레이션 결과 제안된 다채널 전류 제어 방식의 AFS의 전극봉이 균일하게 이온화 되는것을 확인할 수 있었다.

• 환경생물
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• 제37권3호
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• pp.389-395
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• 2019

본 연구는 둥근성게(Mesocentrotus nudus)의 배아를 이용하여 전 세계적으로 많이 이용되고 있는 살생물제(Biocides)에 대한 독성 평가를 수행하였다. 실험에 사용한 살생물제는 총 3종, Sea-nine 211, Diuron, Irgarol 1051이었다. 그 중, 둥근성게(M. nudus)의 수정과 발생률에 미치는 영향은 모두 EC₅₀을 기준으로 보았을 때, Sea-nine의 독성이 가장 강한 것으로 나타났고, Irgarol, Diuron의 순으로 나타났다. 이러한 살생물제, 특히 Sea-nine은 해양무척추동물의 초기 발생과정과 유생의 성장과정에 치명적인 영향이 있는 것으로 알려져 있으므로 이 물질들에 대한 관리가 필요할 것으로 판단된다.

• 멤브레인
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• 제24권4호
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• pp.276-284
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• 2014

본 연구에서는 소수성 PVDF막 표면에 중성 친수성 고분자인 Poly(vinyl alcohol) (PVA)를 코팅한 후 순수 투과도를 측정하고 대표적인 단백질 오염물질인 bovin serum albumin (BSA)에 대하여 파울링 실험을 수행하였다. BSA 용액 20 ppm 조건에서 파울링 실험을 수행한 결과, 코팅 전 막에 비하여 순수 투과도는 감소하였지만 내오염성은 현저히 증가됨을 알 수 있었다. 코팅된 PVA의 분자량이 커질수록 순수 투과도는 감소하였으나, 내오염성이 증가하는 경향을 보였다. 또한, 코팅된 PVA의 농도가 높아질수록 순수 투과도는 감소하였고, 내오염성이 증가하였다. 이는 접촉각과 AFM 측정 결과와 관련하여 코팅 후 막 표면에 친수성의 증가와 거칠기가 감소했기 때문으로 여겨진다.

• Membrane and Water Treatment
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• 제6권3호
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• pp.205-224
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• 2015

A novel hydrophilic poly (vinylidene fluoride)/poly (p-phenylene terephthalamide) (PVDF/PPTA) blend membrane was prepared by in situ polycondensation of p-phenylene diamine (PPD) and terephthaloyl chloride (TPC) in PVDF solution with subsequent nonsolvent induced phase separation (NIPS) process. For comparison, conventional solution blend membrane was prepared directly by adding PVDF powder into PPTA polycondensation solution. Blend membranes were characterized by means of viscometry, X-ray photoelectron spectroscopy (XPS), Field Emission Scanning Electron Microscopy (FESEM). The effects of different blending methods on membrane performance including water contact angle (WCA), mechanical strength, anti-fouling and anti-compression properties were investigated and compared. Stronger interactions between PVDF and PPTA in in situ blend membranes were verified by viscosity and XPS analysis. The incorporation of PPTA accelerated the demixing rate and caused the formation of a more porous structure in blend membranes. In situ blend membranes exhibited better hydrophilicity and higher tensile strength. The optimal values of WCA and tensile strength were $65^{\circ}$ and 34.1 MPa, which were reduced by 26.1% and increased by 26.3% compared with pure PVDF membrane. Additionally, antifouling properties of in situ blend membranes were greatly improved than pure PVDF membrane with an increasing of flux recovery ratio by 25%. Excellent anti-compression properties were obtained in in situ blend membranes with a stable pore morphology. The correlations among membrane formation mechanism, structure and performance were also discussed.

• 한국전기전자재료학회논문지
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• 제23권11호
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• pp.886-890
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• 2010

The polytetrafluoroethylene (PTFE) films are deposited on glass using conventional rf-magnetron sputtering method. Their hydrophobic properties are investigated for application as an anti-fouling coating layer on the screen of displays. It is found that the hydrophobicity of PTFE films largely depends on the sputtering conditions, such as Ar gas flow and deposition time during sputtering process. These conditions are closely related to the deposition rate or thickness of PTFE film. Thus, it is also found that the deposition rate or the film thickness affects sensitively the geometrical morphology formed on surface of the rf-spluttered PTFE films. In particular, the PTFE film with 1950 nm thickness deposited for 30 minute at rf-power 50 W shows a very excellent optical transmittance of over 90% and a good anti-fouling property and a good durability.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2011년도 전기공동학술대회 논문집
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• pp.192-192
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• 2011

For the safety of vessels sailing Marine Transport Facility announces sea route, reefs or shallow water. Photovoltaic, independent power system, installation in the general Marine Transport Facilities to be used in the marine lantern. Due to install of communications, controls, power consumption inceases. And the weather of cloudy day or rainy, generation of electricity is decrease. Recently, power system of marine facility using a hybrid generation system, photovoltaic generation system and wave power generation system. But increase of adhered shellfish inside the water column, is the cause of the reduction of efficiency. So study was conducted to Single channel AFS(Anti-Fouling system). In this paper we offer the Multi channel AFS for Marine Transport Facility and have simulated. Improve the accuracy of the research, we using the result of anode, in the experiment were actually in the buoy, is based on simulation. The experimental results is shown every anode's, in the Marine Transport Facility, ionization was conducted identically.

• Biomaterials and Biomechanics in Bioengineering
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• 제3권1호
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• pp.59-69
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• 2016

A surface resisting protein adsorption and cell adhesion is highly desirable for many biomedical applications such as diagnostic devices, biosensors and blood-contacting devices. In this study, a surface conjugated with sulfobetaine molecules was fabricated via the click reaction for the anti-fouling purpose. An alkyne-containing substrate (Alkyne-PPX) was generated by chemical vapor deposition of 4-ethynyl-[2,2]paracyclophane. Azide-ended mono-sulfobetaine molecules were synthesized and then conjugated on Alkyne-PPX via the click reaction. The protein adsorption from 10% serum was reduced by 57%, while the attachment of L929 cells was reduced by 83% onto the sulfobetaine-PPX surface compared to the protein adsorption and cell adhesion on Alkyne-PPX. In conclusion, we demonstrate that conjugation of mono-sulfobetaine molecules via the click chemistry is an effective way for reduction of non-specific protein adsorption and cell attachment.

• 상하수도학회지
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• 제24권2호
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• pp.143-155
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• 2010

Fouling by inorganic scales needs to be prevented to effectively operate sea water reverse osmosis(SWRO) membrane systems. The extents of inorganic scaling with different array designs including one-pass, two-pass and several hybrid designs were evaluated using seawater from southern sea near the city of Chang-Won. The used methods for evaluation were Stiff and Davis Index(S&DSI) calculation and several laboratory experiments. The formation potential of inorganic scale fouling was quite great under the examined conditions, which was confirmed by the laboratory experimental results. The inorganic scale was not avoidable fouling if any anti-scaling measures were not applied. The RO showed decreased flux under the scale formation conditions. The increases in S&DSI from 1.43 to 5 made small decreases in flux, which indicated that formation of inorganic scales had more substantial effects on RO flux than amount of inorganic scales.

• Membrane and Water Treatment
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• 제9권6호
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• pp.393-403
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• 2018

In this research commercial polyethersulfone (PES) membrane was modified using $TiO_2$ nanoparticles (P-25 Degussa) and further irradiated using UV light to overcome the hydrophobicity and fouling nature of the membrane. Further the membranes were characterized using SEM and FTIR. Contact angle measurements study confirmed the hydrophilic tendency of the modified membrane by decreasing the contact angle from $73^{\circ}$ to $20.28^{\circ}$. The modified membranes showed higher flux and better anti-fouling properties as compared to the unmodified counterparts. The optimum conditions were found to be 0.5 wt% $TiO_2$ loading with 60 min membrane immersion and 10 min UV light illumination. The effect of different pH conditions of feed was analysed. Real wastewater filtration experiments also indicated better performance of modified membranes as opposed to neat PES membranes.