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Strain imaging of a Cu_2S switching device
Keiji Takata,Ryota Tamura,Toshihiro Kasama,Masataka Fukuyama,Shin Yokoyama,Hiroshi Kajiyama 한국물리학회 2011 Current Applied Physics Vol.11 No.6
Strain imaging of electrochemical behavior of a solid electrolyte Cu_2S in switching devices for nonvolatile memories is presented. The precipitation and dissolution of Cu, and the nonstoichiometry changes cause changes in volume. Strain imaging we have proposed detects the volume changes through the surface displacements using scanning probe microscopy and provides high resolution images. We observed the distributions of the electrochemical reactions in Cu_2S and located the Cu bridges causing switching.
Thermal strain imaging of chalcogenide in a phase change memory
Keiji Takata,Hiroya Maekawa,Hiroki Endo 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Thermal strain imaging using a scanning probe microscope enables us to observe thermal distribution with high resolution. A phase change memory (PCM) based on chalcogenide glasses switches their two stable states having low and relatively high resistances by Joule heating. Images obtained by thermal strain imaging revealed that Joule heating was mainly generated in particular regions and some boundaries. The large fluctuation of increases in temperature in the active area should greatly affect phase change in PCM.
Keiji Yokoyama,Ryo Yamauchi,Kumiko Shibata,Hiromi Fukuda,Hideo Kunimoto,Kazuhide Takata,Takashi Tanaka,Shinjiro Inomata,Daisuke Morihara,Yasuaki Takeyama,Satoshi Shakado,Shotaro Sakisaka 대한간학회 2019 Clinical and Molecular Hepatology(대한간학회지) Vol.25 No.2
Background/Aims: There is a controversy about the availability of invasive treatment for esophageal/gastric varices in patients with Child-Pugh class C (CP-C) end-stage liver cirrhosis (LC). We have evaluated the validity of invasive treatment with CP-C end-stage LC patients. Methods: The study enrolled 51 patients with CP-C end-stage LC who had undergone invasive treatment. The treatment modalities included endoscopic variceal ligation in 22 patients, endoscopic injection sclerotherapy in 17 patients, and balloon-occluded retrograde transvenous obliteration (BRTO) in 12 patients. We have investigated the overall survival (OS) rates and risk factors that contributed to death within one year after treatment. Results: The OS rate in all patients at one, three, and five years was 72.6%, 30.2%, and 15.1%, respectively. The OS rate in patients who received endoscopic treatment and the BRTO group at one, three, and five years was 67.6%, 28.2% and 14.1% and 90.0%, 36.0% and 18.0%, respectively. The average of Child-Pugh scores (CPS) from before treatment to one month after variceal treatment significantly improved from 10.53 to 10.02 (P=0.003). Three significant factors that contributed to death within one year after treatment included the presence of bleeding varices, high CPS (≥11), and high serum total bilirubin levels (≥4.0 mg/dL). Conclusions: The study demonstrated that patients with a CPS of up to 10 and less than 4.0 mg/dL of serum total bilirubin levels may not have a negative impact on prognosis after invasive treatment for esophageal/gastric varices despite their CP-C end-stage LC.
Takahiro Nagata,Sadahiro Funakoshi,Daisuke Morihara,Satoshi Shakado,Keiji Yokoyama,Kazuhide Takata,Takashi Tanaka,Atsushi Fukunaga,Ryo Yamauchi,Hiromi Fukuda,Hiroki Matsuoka,So Imakiire,Hideto Sakisak 대한장연구학회 2023 Intestinal Research Vol.21 No.4
Background/Aims: The frequency and details of nonalcoholic fatty liver disease (NAFLD) complications in patients with inflammatory bowel disease (IBD) remain unclear. This study aimed to clarify characteristics of NAFLD in patients with IBD.Methods: We retrospectively identified and enrolled patients with IBD diagnosed with or without NAFLD by undergoing abdominal computed tomography (CT) at our institution between 2005 and 2020. The primary endpoint was the complication rate of NAFLD in patients with IBD. Secondary endpoints were the clinical characteristics of nonobese patients with IBD and comorbid NAFLD and their association with nutritional and inflammatory parameters.Results: Twenty-one (21.9%) of 96 eligible patients with IBD also had NAFLD. In nonobese patients (defined as patients with a body mass index <25 kg/m<sup>2</sup>), C-reactive protein (CRP; <i>P</i><0.001) and alanine aminotransferase (<i>P</i>=0.018) levels were higher and the albumin level (<i>P</i>=0.005) and prognostic nutritional index (PNI; <i>P</i>=0.002) values were lower in patients with NAFLD than in those without NAFLD. The PNI value was positively correlated (<i>P</i><0.001) and the CRP level was negatively correlated (<i>P</i>=0.001) with the hepatosplenic ratio. However, in the NAFLD combined group, PNI (<i>P</i><0.05) and CRP values (<i>P</i><0.001) were improved over time after CT imaging by continuing IBD treatment.Conclusions: Worsening nutritional and inflammatory status in IBD patients is associated with complications of NAFLD. Diagnosis of NAFLD in IBD patients using CT imaging might be useful not only for early detection of NAFLD but also in assessing the need for therapeutic intervention for IBD.