http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
혼합공정과 부착성장공정을 조합한 2단계 혐기 조합공정에서 palm oil mill effluent의 처리
신창하,손성민,정주영,박주양 대한상하수도학회 2013 상하수도학회지 Vol.27 No.1
Present study was conducted to evaluate the performance of Anaerobic Hybrid Reactor (AHR) combined with two types of anaerobic attached growth reactors at mesophilic temperature (37 °C). The reactor was operated at the influent substrate condition of 19,400 mg/L soluble chemical oxygen demand (sCOD). The organic loading rate (OLR) and flow rate were varied in the range of 9.5 ~ 22.5 kg/m3.day and 10.6 ~ 26.0 L/day respectively since start-up was done. The COD removal efficiency of 93 % was measured at the OLR of 14 kg/m3.day in AHR. However a reduction in removal efficiency to as low as 85 % could have been related to a combined effect of high concentration suspended solids (SS) concentration over 3,800 mg/L. On the other hand the total COD removal efficiencies were measured to be 96.3 % and 96.2 % for AHR+APF and AHR+ADF respectively. The pH of the POME was adjusted to neutral range by using sodium bicarbonate at the initial stages of the reactor feed, later stages pH adjustment was not required as the pH was maintained in the desired neutral range due to self-buffering capacity of the reactor. The reactor proved to be economically acceptable and operationally stable. The biogas was measured to have CH4 and CO2 with a ratio of 35:65, and methane gas production rate was estimated to be 0.17 ~ 10.269 L CH4/g CODremoved.
유기물 부하가 Anaerobic Hybrid Reactor 운전효율에 미치는 영향
신창하,오대양,김태훈,박주양 대한상하수도학회 2012 상하수도학회지 Vol.26 No.4
Anaerobic Digestion Process is evaluated as efficient wastewater treatment process with the removal of high concentrations of organic waste and production of biogas. This study was performed using hybrid anaerobic hybrid reactor (AHR) which consists of anaerobic sludge blanket (UASB) and biofilm-coated filter media was applied for Palm Oil Mill Effluent (POME) for 80 days to know optimum removal efficiency and production of biogas by comparing each part which divided changing Organic Loading Rate (OLR). As a result of this study, the removal efficiency was 90.4% when the organic loading rate of influent was 15 kg COD/m³/day. Since organic loading rate was up to 20 kg COD/m³/day, the removal rate declined 80.7%. Over loading of influent caused sludge expansion and overproduction of microorganism. Amount of biogas was collected 82.3 L/day and pH was remained 6.9 constantly with balance of alkalinity.
김동민,채수성,강호진,이성진,장기태 대한교통학회 2021 대한교통학회 학술대회지 Vol.85 No.-
개별 차량의 속도 예측은 교통 흐름의 원활한 운영과 안전, 그리고 차량의 주행 에너지 효율 향상에 있어 중요한 연구이다. 기존의 차량 속도 예측 관련 연구들은 크게 모델 기반과 수집 데이터 기반의 두 가지 방법론들을 기반으로 진행되었다. 모델 기반의 연구는 kinematic 이론과 같이 기존에 있었던 교통 모델들을 기반으로 예측 모델들을 제시하였다. 그러나, 이러한 모델들은 도로 환경, 구조에 따라 수식 모델에 필요한 파라미터들을 조정해야만 하며, 교통 흐름에 따라 예측 성능이 다소 차이를 가지고 있다. 한편, 수집 데이터 기반의 모델들은 차량에서 수집된 시계열 데이터들과 관측된 교통 환경 데이터들을 매개로 기계학습 혹은 딥러닝 기법을 통해 개발되었다. 그러나, 학습에 필요한 데이터 수가 많아야 한다는 단점을 가지고 있다. 그럼에도 불구하고, 교통 공학 이론 기반의 예측 모델들과 달리, 수집된 데이터 기반의 예측 모델 개발이 용이하며 예측 오차 또한 더 적은 결과들을 보여주었다. 하지만, 데이터 기반의 기존 모델들에서 제시한 결과들은 전반적인 교통 흐름의 운영에는 효용이 있으나, 이를 기반으로 실제 개별 차량의 속도 예측을 수행하여 에너지 효율 향상이나 안전주행을 위한 개별 차량 운영의 적용에는 적합하지 않다. 이에 본 연구는 기존 학습 모델들에서 사용되었던 입력 데이터들 뿐만 아니라 차량 간 거리와 도로의 평균 속도 정보를 추가적으로 반영하여 개별 차량 속도의 단기 예측에 적용 가능한 학습 모델 방향을 제시하고자 한다.
辛昌夏 청주대학교 사회(지리)교육학과 1986 上黨地理 Vol.- No.5
The main purpose of this reserch is to investigate the characteristics and topographic development of the piedmont erosion surface. conspicuous development of the piedmont erosion surface can be found at the foots Mt. Sobaeg. Its piedmont erosion surface is a large scale gentle slope from 4 to 6km and 1.5 to 2.5 km length, under an altitude of 250 to 400meter which is developed in the Biotite Granite Zone. The inclinations of slopes ranged from 1˚on the lower of slope to about 8˚near the mountain front, and the slope of rear mountain is steep with 30˚ to 40˚ inclination. The bedrock of the piedmont erosin surface consists of weathered granite and the rear mountain consists of granitic gneiss(Sobaeg San Gneiss Complex). The longitudinal section profiles show slightly undulating shapes. This indicates that it was exposed to the sheet erosion and dissection for a long period of time ever since it's formation. The most of this gentle slope covered with a thin layer of slope deposits, as 0.5 to 3 meters, which are mixed pebbles, cobbles, boulders and fine matrix. Those deposits are in lack of sorting and bedding state. It were supplied from rear mountain and bedrock surface. The present piedmont erosion surface is being protected by the deposit materials, but is now being dissected by streams and erosio of head ward.