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김선일,노성희 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0
영색폐수 처리를 위한 역삼투와 나노막의 분리특성 김선일 $ 노성희 조선대학교 화학공학과 역삼투법에서는 유기 고분자의 dielectric 계수가 낮기 때문에 용존염이 막에 잘 흡착되지 않을 뿐 아니라, 고압(800-1500 psig)에서는 용매인 물이 유효압력차(ᅀP-ᅀπ)에 비례하여 투과되며, 유기물질의 침착현상이 적으므로 막의 수명도 길어진다. 역삼투막은 용존염을 분리제거 할 뿐만 아니라 분자량이 적은 유기물 및 aromatic hydrocarbon 등의 분리조작에도 그 이용 가능성이 고조되고 있다. 현재 역삼투막으로서는 cellulose-acetate 외에 방향족 polyamide 등 비초산 셀룰로스막 계열도 개발되어 있으며, 평판형, 관형, 나권형 및 중공사형 등의 모듈이 다방면의 분리공정에 이용되고 있다. 본 연구에서는 일반적으로 사용되고 있는 반응성 염료, 산성 염료, 염기성 염료, 직접 염료 및 분자 염료를 모델 염료폐수로 조제하여 평판형 모듈로 역삼투(HR98PP) 및 나노막(NF45)을 이용하여 염의 농도, 온도 등에 따른 투과플럭스와 배제율의 영향을 비교 검토하였다. 역삼투막의 경우 압력 30bar에서 NaCI 용액 농도 0.1%, 1%, 5% 및 20% 일 때 투과플럭스는 각각 101, 71, 58 및 40 L/m<sub>2</sub>$h, 배제율은 각각 98.5%, 98%, 92.4% 및 80.1%로 나노막의 경우에서와 같이 NaCI 농도가 증가할수록 낮게 나타났다. 또한 압력이 10bar, 20bar, 30bar 및 40bar일때 0.1% NaCI 용액의 배제율은 각각 99.1%, 99.1%, 98.5% 및 98.5%로 나노막에 비해 현저히 높게 나타났다. 나노막과 역삼투막은 온도가 상승함에 따라 막을 형성하는 고분자에 segment movement가 발생하여 플럭스가 증가하고 염료의 배제율은 점차 감소하는 경향을 나타내었다.
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김선일,정순종,최종술 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.5
Shape memory effect was observed in an austenitic stainless steel(AISI 304 type), after bending at-196℃ and heating to 340℃. Shape recovery angle was increased with increasing initial bending angle, showing a peak at around 130°, and then decreased with further bending angle. However, the shape recovery ratio was smoothly decreased with increasing the initial bending angle. The shape memory effect of this alloy was due to transformation of austenite to epsiron martensite during deformation and reverse-transformation of the martensite to the austenite on heating above A_f temperature.
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김선일 조선대학교 생산기술연구소 2000 生産技術硏究 Vol.22 No.1
The synthetic procedures of polyacryloylsulfadiazine were searched by DCC and Acid Chloride methods Polymeric drug was synthesized by Acid Chloride method in high yield but DCC method in low yield. The antibacterial test of polymeric drug was investigated in terms of minimum inhibitory conentrations by the common twofold dilution technique. Polymeric drug revealed an excellent antibacterial activity against Bacillus subtilis, Staphyloccus aureus, Micrococcus luteus, Klebsiella pueumouiae.
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Anticlogging과 Declogging에 관한 연구
김선일 조선대학교 생산기술연구소 2000 生産技術硏究 Vol.22 No.1
In this study the three techniques of backflushing, pulsation and in-line flocculation for flux improvement were investigated Backflushing and pulsation are suitable cleaning techniques for permeation flux improvement. A lower frequency of backflushing or stop time before pulsation is better for a larger net volume of permeation with lower level of internal clogging. In-line flocculation improves filtration flux by modifying deposit formation and possible internal clogging. A combination of in-line flocculation and cleaning techniques produces more than 3-4 fold increment in flux and 2-3 fold increment in net permeation volume.
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金善一 弘益大學校 科學技術硏究所 2003 科學技術硏究論文集 Vol.14 No.-
Recent expansion of the Internet and wide deployment of high speed networks such as Gigabit networks and VDSL make switches and routers a new bottleneck in the Internet infrastructure rather than the bandwidth of the network itself. The Internet needs hardware that can process packets at high speed and provide extra functions to support services, such as firewall, load balancing, VPN, VoIP, IDS and etc. Processors based on ASIC have been developed to handle such tasks. However it usually takes a long time to develope ASIC based processors, and their development cost tends to be very high. Recently network processors are introduced in the market to solve the problems. Once a network processor is used in a network device, it is rather easy to change the functionality of the device to a new standard by simply reporgramming it. In this paper we study network processor architectures for the next generation Internet and its requirements. We also study the application areas in which the network processor can be effectively employed and benchmarks to evaluate the performance of the network processors.
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金瑄日,趙成棟,金正圭 조선대학교 기초과학연구소 1981 自然科學硏究 Vol.4 No.1
A Study on Removal of Carbon Monoxide from Anthracite Flue Gas(11) As a basic study for making combustion-aid-device, the oxidation of carbon monoxide from anthracite flue gas has been investigated by using a catalytic plate which was prepared from some metallic oxides. Using mixed catalysts consisting of MnO_2(30wt %), CuO(20wt %), Fe_2O_3 (10wt %), Cr_2O_3(5wt %), NiO (5wt %), CaSO_4(10wt %), and bentonite (20wt %), the oxidation of carbon monoxide took place almost completely. Longer combustion time and low carbon monoxide generation are contradictory to each other and it has been long desired to make those two compatible somehow. The purpose of the present investigation lies in designing an offective new combustion-aid-device to meet gthe above requirements. The essential feature of the new combustion- aid-device consisted of the use of a two stage mixed-catalytic plate. The results observed condirmed that the combustion time was increased tolerably and supposed that carbon monoxide in the flue gas was reoxidized at the catalytic plat by the metallic oxiders. By this reoxidation reaction the concentration of carbon monoxide in the anthracite flue gas was found to be about 1% less than in the case where the conventional combustion device without the catalytic plate was used.
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