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혐기성 유동상 반응조의 여유 공간이 폐수처리 효솔에 미치는 영향
배민수,박수영,범봉수,조광명 ( Min Su Bae,Soo Young Park,Bong Su Bum,Kwang Myeung Cho ) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.2
When an anaerobic activated carbon fluidized bed biofilm reactor is employed for wastewater treatment, a reserve space is required above the fluidized bed to prevent the loss of media, and wastewater treatment efficiency may be affected by the attached and suspended biomass in the reserve space. Therefore, experiments were performed by increasing stepwise the organic loading rates(OLR) of two reactors with and without a reserve space from 2 to 16㎏ COD/㎥-day. Results of the research showed that treatment efficiencies of the reactors were almost similar until the OLR reached 8㎏ COD/㎥-day. At higher OLRs, however, the effluent quality of the reactor without a reserve space was worse than the one with a reserve space. This is due to sloughing-off and washing-out of the biomass in the reactor without a reserve space, but the reactor with a reserve space maintains more biomass because of the attached growth on the inside surface of the reserve space. Therefore, a reserve space for prevention of media loss in an anaerobic activated carbon fluidized bed biofilm reactor would provide an increase in treatment efficiency at high OLRs.
좁은 결손부위에 One-piece narrow diameter implant를 이용한 즉시보철:
배민수(Min-Su Bae),허정욱(Jeong-Uk Heo),박준섭(Jun-Sub Park),예선혜(Sun-Hae Yea),안경미(Kyung-Mi An),손동석(Dong-Seok Sohn) 대한구강악안면외과학회 2009 대한구강악안면외과학회지 Vol.35 No.4
The aim of this case study was to report the clinical outcome of immediate provisionalization using one-piece narrow diameter (3.0mm) implants in missing maxillary lateral or mandibular incisors. The present study included 36 patients who were treated with 62 one-piece narrow diameter implants. After implant placement, immediate provisional restorations were delivered. All implants showed favorable osseointegration and after progressive loading from 3 months to 9 months (average of 5 months), final restorations were completed without failure in all cases. A survival rate of 100 % (62 of 62) was observed up to 23 months of observation (average of 12.6 months).
제니핀에 의해 가교된 다공성 젤라틴/키토산 지지체의 조직공학적 특성 분석
배민수 ( Min Su Bae ),김성은 ( Sung Eun Kim ),나재식 ( Jae Sik Na ),권일근 ( Il Keun Kwon ) 한국조직공학과 재생의학회 2010 조직공학과 재생의학 Vol.7 No.2
Blended natural polymers composed of β-chitosan (Cs) and gelatin (G) with various composition ratios were produced as candidate materials for biomedical application. Novel cross-linked porous scaffold compared of gelatin/chitosan 7:3 5:5 3:7 and different amounts of genipin concentration (0.001, 0.01 and 0.03 mg/ml). Genipin was used to crosslinking agent of gelatin/β-chitosan blends, promoting the formation of primary amine and tertiary amine between chitosan and gelatin, or by itself. The effects of composition and crosslinking on the physical-chemical properties of GCs composite scaffolds were evaluated by ATR-FTIR analysis, water uptake, degradation and in vitro cell viability test. The SEM analysis showed that the pore size of gelatin/chitosan porous scaffolds were increased with increasing blend ratio of chitosan. The ATR-FTIR showed that the amount of amine group of gelatin/ chitosan was decreased with increasing genipin concentration. As the genipin concentration in the scaffold decreased resulting in an enhanced water uptake ability. In this study, NIH3T3 cells were seeded gelatin/β-chitosan porous scaffolds for the cell cytotoxicity, cell proliferation. The porous scaffolds did not affect cell growth because of low cytotoxicity. The porous cross-linked scaffold with the improved characterization and cell viability may be suitable as a biocompatable scaffold for tissue engineering.
부직포 여과막 생물반응조에서 알칼리도가 질산화 성능에 미치는 영향
배민수(Min Su Bae),안윤찬(Yoon Chan Ahn),장명배(Myung Bae Jang),조윤경(Yun Kyung Cho),조광명(Kwang Myeung Cho) 大韓環境工學會 2007 대한환경공학회지 Vol.29 No.7
부직포 여과막 생물반응조의 질산화 성능을 파악하기 위하여 주입폐수의 암모니아 농도를 54∼1,400 mg/L 그리고 알칼리도를 43∼10,480 mg/L로 변화시키면서 약 11시간의 체류시간에서 641일간 실험을 실시한 결과 반응조의 MLSS농도는 최초의 2,650 mg/L에서 830 mg/L까지 감소하였다가 최고 8,340 mg/L까지 증가함으로써 반응조의 용적부하는 0.120∼3.130 kg NH₃-N/m3-day의 범위에서 변하였으나 F/M 비는 0.067∼0.414 kg NH₃-N/kg MLSS-day의 적은 변화를 보였다. 각 실험단계별 평균 질산화 효율이 35.2∼100%로서, 최대 질산화율은 2.970 kg N/m3-day 또는 0.489 g N/g MLVSS-day로 나타났다. MLVSS의 질산화미생물 분율은 최초의 7.1%에서 최고 100%까지 변하였으나 부직포 여과막에 형성된 생물막의 경우에는 2.2%의 매우 낮은 값을 보였다. 미생물 성장계수는 0.117 g VSS/g N removed로 그리고 알칼리도 소모량은 평균 7.08 g alkalinity/g NOx-N produced로 측정되었다. 이러한 실험결과로 보아 부직포 여과막 생물반응조가 고농도 암모니아 폐수의 질산화에 적합한 공법으로 판단된다. To investigate the effects of alkalinity on the nitrification capability of the nonwoven fabric filter bioreactor(NFBR), an experiment was performed for 641 days at a hydraulic retention time of approximately 11 hours by changing the influent concentration of NH₃-N from 54 mg/L to 1,400 mg/L and alkalinity from 43 mg/L to 10,480 mg/L. The MLSS concentration reduced from an initial value of 2,650 mg/L down to 830 mg/L, then increased up to 8,340 mg/L. Though the volumetric loading rate varied in a range of 0.120∼3.130 kg NH₃-N/m3-day, the F/M ratio showed a narrow range of 0.067∼0.414 kg NH₃-N/kg MLSS-day. The average nitrification efficiency at each experimental stage resulted in the range of 35.2∼100%, and the maximum nitrification rate was 2.970 kg N/m3-day or 0.489 g N/g MLVSS-day. The nitrifiers` fraction of the MLVSS increased up to 100% from an initial value of 7.1% and the biofilm formed on the nonwoven fabric filter showed a very low nitrifiers` fraction of mere 2.2%. The growth yield of the MLSS and the alkalinity consumption rate were computed to be 0.117 g VSS/g N removed and 7.08 g alkalinity/g NOx--N produced, respectively. Results of the research suggest that NFBR could be an adequate process for nitrification of wastewaters with high ammonia concentrations.
BMP-2가 고정화된 젤라틴-베타키토산 지지체를 이용한 골 재생 연구
배민수 ( Min Su Bae ),김도완 ( Do Wan Kim ),김성은 ( Sung Eun Kim ),최경규 ( Kyoung Kyu Choi ),권일근 ( Il Keun Kwon ) 한국조직공학·재생의학회 2009 조직공학과 재생의학 Vol.6 No.4
Blended natural polymer composed of β-chitosan and gelatin scaffold was prepared for bone tissue scaffold. After hydrolyzing the scaffold in 1 N NaOH, recombinant human bone morphogenic protein-2(rhBMP-2), which has amine groups was immobilized onto the caboxylic groups on the surface, was immobilized on the surface of scaffold to improve cell viability and bone differentiation. Dental pulp stem cells(DPSCs) were seeded on the series of scaffold(non-treated, hydrolyzed, and BMP-2 immobilized gelatin/β-chitosan porous scaffolds). BMP-2 singnificently increased ALP activity, alizarin red for a week differentiation period compared with non-treated and hydrolyzed scaffolds in vitro. These results indicated that BMP-2-immobilyzed gelatin/β-chitosan porous scaffold would be valuable for bone tissue regeneration.