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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.
고도처리공법이 적용된 하수처리시설에서의 공법적용의 적정성 평가
안준수(Ahn, June-Shu),박태술(Park, Tae-Sool),조정호(Cho, Jung-Ho) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.10
본 연구는 고도처리공법을 적용하여 수년간 가동 중인 하수처리시설에 대한 운전현황을 측정·분석하여, 고도처리공법 적용의 적정성을 평가하고자 하였다. 단위공정별 처리효율은, BOD의 경우 1차침전지 35, 생물반응조 87, 최종방류수 48 %, T-N의 경우 1차침전지 18, 생물반응조 40, 최종방류수 25 %, T-P의 경우 1차침전지 23,, 생 물반응조 38, 최종방류수25 % 등으로, 각 단위공정별로 양호한 처리효율을 나타내었다. 생물반응조 내의 미생물 관 측 결과, 다양한 종류의 세균과 원생동물 및 후생동물이 관측되었고, 담체의 세균 부착기능이 안정적으로 유지되고 있음을 알 수 있었다. 최종방류수질은 BOD 5.5, COD 9.9, SS 4.6, T-N 11.8, T-P 0.99 ㎎/L으로 방류수 수질기준보 다 낮은 양호한 수질상태를 나타내었다. In this study, validity of wastewater treatment system with advanced treatment processes was evaluated by studying its operational conditions by applying the advanced treatment to the wastewater treatment system which was operating for last several years. Study indicated a fair result for the removal efficiencies of BOD, T-P, and T-N for each unit operation. BOD removal efficiencies for primary clarifier, bioreactor, final effluent are 35, 87, and 48 % respectively. T-P(T-N) removal efficiencies for primary clarifier, bioreactor, final effluent are 18(23), 40(38), and 25(25) % respectively. Further investigation of bioreactor showed that various microorganism such as bacteria, protozoa, and metazoa is present in the bioreactor, and the main function of the media, adhesion (adsorption) of microorganism onto the media, is stabilized. Final effluent quality was lower than the regulation, and BOD, COD, SS, T-N, T-P were 5.5, 9.9, 4.6, 11.8, 0.99 ㎎/L respectively.
Polyimide Hollow Fiber 막을 이용한 CH4 - CO2 혼합기체의 분리 특성에 관한 연구
안준수,이승무 ( June Shu Ahn,Sung Moo Lee ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.6
This study was primarily to find the separation characteristics of CH₄-CO₂ mixed gas, using polyimide hollow fiber membrane. For the purpose, the experiments on the sorption-permeation characteristics of CO₂, CH₄ pure gases and mixed ones respectively were made. The experimental conditions were as follows: feed flow rate 0-15ℓ/min, system temperature 30-70℃, and applied pressure 0-20 bar. The membrane materials used in the experiments were a kind of polyimide, which is glassy polymer. The pure gases permeability of CO₂ and CH₄ could be fully explained by the partial immobilized dual-mode sorption model, and in case of mixed gases, some deviation by the nonideality of CO₂ gas was exposed. Ideal separation factor(α^*=IP_(CO₂)/IP_(CH₄)), 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% in the range of this experimental condition(0-20 bar).
안준수(Ahn, June-Shu),박욱근(Park, Wook-Keun),조정호(Cho, Jung-Ho) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.7
본 연구는 간헐적으로 공장폐수가 유입되고 있는 하수처리시설에 대하여 각 단위공정별 운전현황 조사와 수질 측정을 실시하여 운전특성을 파악하고자 하였다. 생물반응조의 운전조건은 MLSS 농도 2,000∼3,000 mg/L, HRT 5.3∼16.3 시간, SRT 2.8∼66.6 일 범위를 나타내었고, SVI는, 최적 범위인 50∼150을 상회하여, 200 이상의 측 정값이 빈번히 발생하여 슬러지 침강성이 양호하지 않은 것으로 관측되었다. 주요 원인은 공장폐수의 유입에 기인한 것으로 판단되며, 이와 같이 공장폐수 유입 시 생물반응조내의 MLDO가 급격히 상승하고 질산화 효율이 빠르게 감 소하며 이차침전지에서는 Pin floc.이 유출되는 현상이 발생하였다. 미생물 관측결과, 다양한 세균 플록과 섬모충류 등이 관측되었으나, Bulking 발생의 원인이 되는 사상균인 Sphaeotilus와 방선균 등도 발견되었다. 단위공정별 처리효 율은 평균적으로는 대체로 양호한 처리효율을 나타내고 있었으나 간헐적인 공장폐수 유입의 영향으로 인한 생물반응 조의 운전특성의 불안정성으로, 처리효율의 변동성이 크게 나타나고 있었다. In this study, characteristics of wastewater treatment of sewage intermittently mixed with industrial wastewater is examined by investigating the operational status of each unit operation and measuring water quality. The bioreactor operating condition was measured for MLSS concentration 2,000∼3,000 mg/L, HRT 5.3 ∼16.3 hour, SRT 2.8∼66.6 day, and SVI frequently showed the value above 200 which was higher than the optimal range of 50∼150. It is thought that the sludge is not in suitable condition for sedimentation caused by the incoming industrial wastewater. When industrial wastewater is come into the system, MLDO inside of bioreactor rapidly increased, rate of nitrification is steeply decreased, and Pin floc. is spilled in the secondary clarifier. In the observance of microorganism showed that various bacterial floc. and ciliata were found as well as actinomycetes and filamentous bacteria(Sphaeotilus) which is known to cause bulking. Efficiency of each unit operation was fairly good in average. However, efficiency of the bioreactor treatment showed high fluctuation by unstable operating condition by intermittently incoming industrial wastewater.
타격기류 건조장치에 의한 하수슬러지의 건조 실증실험에 관한 연구
안준수(Ahn, June-Shu),김병태(Kim, Byung-Tae),조정호(Cho, Jung-Ho) 한국산학기술학회 2012 한국산학기술학회논문지 Vol.13 No.11
본 연구에서는 하수슬러지를 효율적으로 건조시킬 수 있는 방법을 연구하고자 하였다. 슬러지 건조를 위 해서는 슬러지 내 대부분의 함수율을 차지하고 있는 세포 내 함유수분을 제거시키는 것이 필요한데, 이에 대한 제거 장치로서 타격기류 건조장치를 적용하였으며, 직접 하수처리장에 파일롯 플랜트를 설치하여 실증실험을 실시 하여, 이에 대한 운전특성과 적용가능성을 확인하고자 하였다. 주요 운전제어 변수는 슬러지 투입속도, 체인 회전속도, 공정온도 및 투입슬러지 함수율 변화 등이다. 체인의 회 전속도가 증가할수록 생성슬러지 생성수율 증가 등 장치성능이 향상되었고, 공정온도가 상승함에 따라 건조효율이 증가하는 경향을 나타내었다. 투입슬러지 함수율은 60%일 때 생성슬러지 생성수율이 최대이고 함수율도 10% 내 외를 나타내어 최적 조건임을 알 수 있었다. 슬러지 투입속도는 적정 투입속도 이상으로 투입 시, 생성슬러지 생 산량은 증가하지 않는 반면, 오히려 잔류량만 증가하는 현상을 초래하였다. 위와 같은 실험결과로부터 장치의 최 적 운전조건은 체인 회전수 1600rpm(최대속도), 최종 배출온도 80℃, 투입슬러지 함수율 60%, 슬러지 투입속도 60kg/h이며, 이때 장치성능은 생성슬러지 생성수율 85.5%, 함수율 11.0%, 건조효율 81.7% 으로 양호한 결과를 나타내었다. Effective drying method of sewage sludge is researched in this study. To dry the sludge, chain crusher flash dryer was adopted to remove moisture content in the cell which is mostly responsible for the sludge moisture content. And Pilot plant experiment was conducted in real life sewage treatment plant to study effect and characteristics of operating conditions. Operating variables include sludge feeding rate, rotational speed of chain, process temperature and feed moisture content. As rotational speed of chain increased, product yield of sludge increased, and the performance of the testing system increased. And, as process temperature increased, the sludge drying efficiency increased. It is found that optimum feed moisture content is at 60% which shows the maximum sludge product yield and about 10 moisture content(%) of sludge product. Sludge feed rate showed optimal value, and when the sludge feed rate is exceeded, sludge product yield did not increased but the amount of residue increased. Pilot plant experiment results are as follow. The optimal condition for the rotational speed of chain 1600rpm(max. speed), final sludge discharge temperature 80℃, feed moisture content 60%, and feed rate 60kg/h. When the plant was operated at the optimal conditions, the final product showed fairly good results such as sludge product yield 85.5%, moisture content 11.0% and sludge drying efficiency 81.7%.