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금속 샌드위치 판재 대면적 롤 프로젝션 용접에 관한 연구 : Part 1 - 공정 모니터링
안준수,김종화,나석주,임지호,Ahn, Jun-Su,Kim, Jong-Hwa,Na, Suck-Joo,Lim, Ji-Ho 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.3
A roll projection welding machine is introduced to fabricate metallic sandwich plate consisting of a structured inner sheet with projection-like shape and a pair of skin sheets. To fabricate the metallic sandwich plate of consistent and good quality, two process monitoring methods are introduced; dynamic resistance monitoring and skin sheet temperature monitoring. Dynamic resistance monitoring has no time delay but gives only averaged value over plate width. Skin sheet temperature monitoring has certain amount of time delay but is good for predicting weld quality of specified position. By the two complementary monitoring methods, the characteristics of the new welding process is successfully understood.
안준수 대진대학교 1996 大眞論叢 Vol.4 No.-
A sample survey was performed for the two working places (Incheon and Pupyong) to measure the level of soil contamination. The experimental analysis showed that the amount of the volatile component from the Pupyong A area was 4.66%, which means 55% higher than that of the other areas. The amount from the other areas was about 3%. It's believed the soil contamination was caused from the factory. pH was weak basic (7.4-7.6) and CN was 0-0.14ppm. TOC was about 179.9 ppm from the Pupyong A area. which was also three times as high as the average of the other areas. Organic compounds might be responsible for that ; the more precise survey is needed to study the contamination. The measurements for the heavy metals such as Hg, Cd, As, Pb, Cr, and Cu from the other areas were lower than the standard level, however the amounts of the elements from the Pupyong A area were 3-10 times as high as the other areas ; a special care is needed for these.
Hollow Fiber Membrane을 이용한 기체 분리 특성에 관한 연구
안준수 대진대학교 1994 大眞論叢 Vol.2 No.-
This dissertation was primarily to find the separation charateristics of pure CH₄, CO₂ gas, using polyimide hollow fiber membrane separation system. For the purpose, an experiment on the sorption-permeation characteristics of CO₂, CH₄ pure gases was made. The experimental conditions were as follows: feed flow rate 0~15 l/min, system temperature 30~70 ℃ , and applied pressure 0~20 bar. The membrane materials used in the experiments were a kind of polyimide, glassy polymer The permeability of them could be fully explained by the partial immobilized dual-mode sorption model. The temperature dependence of the permeability to penetrant could be showed with Arrhenius type, and then the activation energies of CO₂ and CH₄ were 1038 and 1927 kJ/mol respectively. Ideal separation factor(α^(*)=P_(A)/P_(B)), the permeability ratio of the two gases, was a little decreased according to the increase of feed pressure, while in much larger scale decreased with the increase of system temperature. And when the deviation to the nonideality was observed, with fugacity instead of pressure as permeation driving force, the difference was found within 5 % under the range of this experimental condition(0∼20 bar).