Sang-Ki Kim

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We propose an extension of nonnegative matrix factoriza-tion (NMF) to multilayer network model for dynamic my-ocardial PET image analysis. NMF has been previously applied to the analysis and shown to successfully extract three cardiac components and time-activity curve from the image sequences. Here we apply triple nonnegative-matrix factorization to the(More)
Local Number Portability (LNP) is an Intelligent Network (IN) service, which provides end users the ability to change local telephone service providers without changing their telephone numbers. LNP is a key service for increasing competition in the local telephone marketplace. To implement LNP, Number Portability Administration Center (NPAC) is needed to(More)
Bovine coronavirus (BCoV) is an etiological agent associated with winter dysentery (WD), prevalent in adult cattle during the winter. Although we previously detected, isolated, and characterized BCoV strains from adult cattle with WD (WD-BCoV strains) during the winter in South Korea, the precise epidemiology, as well as the causative agent of diarrhea in(More)
BACKGROUND FcRγ-deficient natural killer (NK) cells (g(-)NK cells) have been associated with cytomegalovirus (CMV) infection. However, the frequency of g(-)NK cells in a CMV-endemic area (i.e., Korea) has not yet been studied. We examined the frequency of g(-)NK cells and expression of CD57 on NK cells in cord blood (CB) and adult blood (AB). METHODS Of(More)
which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Recently, successful cancer immunotherapy has aroused great interest in application of this approach in hematolo-gical malignancies. Immune responsiveness is a key clinical feature of hematological malignancies. Indeed,(More)
In order to provide context-aware services, context modeling is one of the most important tasks. Ontology has been widely accepted for the context modeling but it brings some overheads in the process of reasoning large-scale and dynamic information. In mobile networks, especially, ontology should be verified to be applicable for Context-aware Services since(More)
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