Jae-Seok Kim — Page 2 | Search PubMed

PubMed2002

Intensity based affine registration including feature similarity for spatial normalization.

This paper presents a new spatial normalization with affine transformation. The quantitative comparison of brain architecture across different subjects requires a common coordinate system. For the analysis of a specific brain area, it is required to normalize and compare a region of interest and global brain. Intensity based registration method matches the global brain well. But a region of interest may not be locally normalized compared to feature based method. The method of this paper uses feature similarities of local region as well as intensity similarities. The lateral ventricle and the central gray nuclei of brain including the corpus callosum, which is used for features in Schizophrenia detection, is appropriately normalized. In the results section, our method reduces the difference of feature area such as corpus callosum (7.7%, 2.4%) and lateral ventricle (8.2%, 13.5%) compared with mutual information and Talairach methods.

Algorithms↗

PubMedDate not supplied

Effect of powdered activated carbon on the performance of an aerobic membrane bioreactor: comparison between cross-flow and submerged membrane systems.

The effects of powdered activated carbon (PAC) on the performance of an aerobic membrane bioreactor were investigated under two different filtration modes: cross-flow and submerged filtration. Under a cross-flow microfiltration mode, floc breakage resulting from sludge recirculation caused a rapid decrease in the microbial floc size and the release of colloidal and soluble components including extracellular polymeric substances (EPS). The released components caused rapid loss of membrane permeability by the formation of a dense cake layer on the surface of the membrane. Biological activated carbon (BAC) sludge formed by the addition of PAC released lower amounts of fine colloids and EPS. Although the pattern of floc breakage of the BAC sludge by pumping shear was similar to that of conventional activated sludge, PAC in the BAC microbial floc adsorbed or entrapped some microfloc components into the floc and reduced permeability loss by approximately 35% compared with conventional activated sludge. Under a submerged microfiltration mode, the effect of PAC addition was more pronounced. For the BAC sludge, the increase in transmembrane pressure was more sluggish and, thus, the operating interval could be extended up to 3 times that for the submerged membrane bioreactor with normal activated sludge.

Bioreactors↗