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Pathogenic role of the gut microbiota in gastrointestinal diseases
( Hiroko Nagao Kitamoto ),( Sho Kitamoto ),( Peter Kuffa ),( Nobuhiko Kamada ) 대한장연구학회 2016 Intestinal Research Vol.14 No.2
The gastrointestinal (GI) tract is colonized by a dense community of commensal microorganisms referred to as the gut microbiota. The gut microbiota and the host have co-evolved, and they engage in a myriad of immunogenic and metabolic interactions. The gut microbiota contributes to the maintenance of host health. However, when healthy microbial structure is perturbed, a condition termed dysbiosis, the altered gut microbiota can trigger the development of various GI diseases including inflammatory bowel disease, colon cancer, celiac disease, and irritable bowel syndrome. There is a growing body of evidence suggesting that multiple intrinsic and extrinsic factors, such as genetic variations, diet, stress, and medication, can dramatically affect the balance of the gut microbiota. Therefore, these factors regulate the development and progression of GI diseases by inducing dysbiosis. Herein, we will review the recent advances in the field, focusing on the mechanisms through which intrinsic and extrinsic factors induce dysbiosis and the role a dysbiotic microbiota plays in the pathogenesis of GI diseases. (Intest Res 2016;14:127-138)
NiZn Ferrite Coating for Electrical Insulation of MnZn Ferrite Cores
Kitamoto, Y.,Yajima, H.,Nakayama, Y.,Abe, M. The Korean Ceramic Society 2001 한국세라믹학회지 Vol.38 No.6
The ferrite plating with applying power ultrasound waves of 19.5 kHz and 600W enabled us to encapsulate entirely MnZn ferrite cores for transformers with Ni$\sub$x/Zn$\sub$y/Fe$\sub$3-x-y/O$_4$coating. Supplying a NH$_4$OH solution during the plating broke the limit of the solubility of Ni ions to ferrite-plated films. The electrical resistivity of the NiZn ferrite coating increased with increasing the Ni and Zn content, reaching 2.3${\times}$10$\^$5/Ωcm at the composition of Ni$\sub$0.24/Zn$\sub$0.30/Fe$\sub$2.46/O$_4$. The saturation magnetization was 540 emu/㎤. As a result, the MnZn ferrite cores were successfully encapsulated with the NiZn ferrite coatings for an insulation layer.
Expressions of the phase and gain margins as roots of polynomials and its applications
Takuya Kitamoto 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper presents a method to express the phase and gain margins of a given SISO system as roots of polynomials. The expression is useful especially when the given system contains unknown parameters where numerical methods cannot be applied. We present a numerical example to illustrate the method and its applications.