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  1. Article

    Open Access

    Convergence analysis of approximation formulas for analytic functions via duality for potential energy minimization

    We investigate the approximation formulas that were proposed by Tanaka & Sugihara (IMA J. Numer. Anal. 39(4):1957–1984, 2019), in weighted Hardy spaces, which are analytic function spaces with certain asymptot...

    Satoshi Hayakawa, Ken’ichiro Tanaka in Japan Journal of Industrial and Applied Mathematics (2024)

  2. Article

    Open Access

    Monte Carlo construction of cubature on Wiener space

    In this paper, we investigate application of mathematical optimization to construction of a cubature formula on Wiener space, which is a weak approximation method of stochastic differential equations introduce...

    Satoshi Hayakawa, Ken’ichiro Tanaka in Japan Journal of Industrial and Applied Mathematics (2022)

  3. Article

    Open Access

    Therapeutic effects of eperisone on pulmonary fibrosis via preferential suppression of fibroblast activity

    Although the exact pathogenesis of idiopathic pulmonary fibrosis (IPF) is still unknown, the transdifferentiation of fibroblasts into myofibroblasts and the production of extracellular matrix components such a...

    Ken-ichiro Tanaka, Mikako Shimoda, Toshifumi Sugizaki, Maki Ikeda in Cell Death Discovery (2022)

  4. No Access

    Article

    Maximum likelihood estimation of the Fisher–Bingham distribution via efficient calculation of its normalizing constant

    This paper proposes an efficient numerical integration formula to compute the normalizing constant of Fisher–Bingham distributions. This formula uses a numerical integration formula with the continuous Euler t...

    Yici Chen, Ken’ichiro Tanaka in Statistics and Computing (2021)

  5. Article

    Correction to: Kernel-based interpolation at approximate Fekete points

    An equation in Section 2.1 has been corrected.

    Toni Karvonen, Simo Särkkä, Ken’ichiro Tanaka in Numerical Algorithms (2021)

  6. No Access

    Article

    Kernel-based interpolation at approximate Fekete points

    We construct approximate Fekete point sets for kernel-based interpolation by maximising the determinant of a kernel Gram matrix obtained via truncation of an orthonormal expansion of the kernel. Uniform error ...

    Toni Karvonen, Simo Särkkä, Ken’ichiro Tanaka in Numerical Algorithms (2021)

  7. No Access

    Article

    High glucose promotes mineralization via bone morphogenetic protein 4-Smad signals in early stage of osteoblast differentiation

    Diabetes mellitus is associated with bone fragility. Although osteoblast maturation is disturbed in patients with diabetes mellitus, the involvement of high glucose (HG) in different stages of osteoblast matur...

    Ayumu Takeno, Ippei Kanazawa, Ken-ichiro Tanaka in Diabetology International (2021)

  8. No Access

    Chapter

    Construction of Approximation Formulas for Analytic Functions by Mathematical Optimization

    We describe our methods developed recently to construct formulas for approximating functions and numerical integration. Our methods are developed basically for improving the with variable transformations kno...

    Ken’ichiro Tanaka, Masaaki Sugihara in New Sinc Methods of Numerical Analysis (2021)

  9. No Access

    Article

    Generation of point sets by convex optimization for interpolation in reproducing kernel Hilbert spaces

    We propose algorithms to take point sets for kernel-based interpolation of functions in reproducing kernel Hilbert spaces (RKHSs) by convex optimization. We consider the case of kernels with the Mercer expansi...

    Ken’ichiro Tanaka in Numerical Algorithms (2020)

  10. No Access

    Article

    Modulators of Fam210a and Roles of Fam210a in the Function of Myoblasts

    Fam210a is a novel protein regulating muscle mass and strength in mice in vivo. However, detailed effects of Fam210a on the function of myoblasts as well as modulators of Fam210a are still unknown. We, thus, i...

    Ken-ichiro Tanaka, Ippei Kanazawa, J. Brent Richards in Calcified Tissue International (2020)

  11. Article

    Open Access

    A2B adenosine receptor inhibition by the dihydropyridine calcium channel blocker nifedipine involves colonic fluid secretion

    The adenosine A2B receptor is a critical protein in intestinal water secretion. In the present study, we screened compound libraries to identify inhibitors of the A2B receptor and evaluated their effect on adenos...

    Teita Asano, Yuto Noda, Ken-Ichiro Tanaka, Naoki Yamakawa in Scientific Reports (2020)

  12. Article

    Open Access

    Idebenone has preventative and therapeutic effects on pulmonary fibrosis via preferential suppression of fibroblast activity

    Alveolar epithelial injury induced by reactive oxygen species (ROS) and abnormal collagen production by activated fibroblasts (myofibroblasts) is involved in the onset and exacerbation of idiopathic pulmonary ...

    Toshifumi Sugizaki, Ken-ichiro Tanaka, Teita Asano in Cell Death Discovery (2019)

  13. No Access

    Article

    Bazedoxifene Ameliorates Homocysteine-Induced Apoptosis via NADPH Oxidase-Interleukin 1β and 6 Pathway in Osteocyte-like Cells

    Homocysteine (Hcy) increases oxidation and inflammation; however, the mechanism of Hcy-induced bone fragility remains unclear. Because selective estrogen modulators (SERMs) have an anti-oxidative effect, SERMs...

    Masakazu Notsu, Ippei Kanazawa, Ayumu Takeno in Calcified Tissue International (2019)

  14. No Access

    Article

    Insulin-Like Growth Factor-I Protects Against the Detrimental Effects of Advanced Glycation End Products and High Glucose in Myoblastic C2C12 Cells

    Previous studies suggested that advanced glycation end products (AGEs) and insulin-like growth factor-I (IGF-I) are involved in the mechanism of diabetes-induced sarcopenia. In this study, we examined effects ...

    Naoko Adachi, Ippei Kanazawa, Ken-ichiro Tanaka in Calcified Tissue International (2019)

  15. No Access

    Article

    Overweight and underweight are risk factors for vertebral fractures in patients with type 2 diabetes mellitus

    The aim of this cross-sectional study was to examine the association between body mass index (BMI) and the prevalence of vertebral fracture (VF) in Japanese patients with type 2 diabetes (T2DM). A total of 798...

    Ippei Kanazawa, Masakazu Notsu, Ayumu Takeno in Journal of Bone and Mineral Metabolism (2019)

  16. No Access

    Article

    Osteoporosis and vertebral fracture are associated with deterioration of activities of daily living and quality of life in patients with type 2 diabetes mellitus

    Patients with type 2 diabetes mellitus (T2DM) have an increased risk of fragility fracture. However, whether diabetes-related osteoporosis independently contributes to the deterioration of activities of daily ...

    Ippei Kanazawa, Ayumu Takeno, Ken-ichiro Tanaka in Journal of Bone and Mineral Metabolism (2019)

  17. Article

    Open Access

    Protective and therapeutic effect of felodipine against bleomycin-induced pulmonary fibrosis in mice

    Idiopathic pulmonary fibrosis (IPF) involves alveolar epithelial injury and abnormal collagen production caused by activated fibroblasts; transforming growth factor (TGF)-β1 is implicated in this activation. I...

    Ken-ichiro Tanaka, Tomomi Niino, Tomoaki Ishihara, Ayaka Takafuji in Scientific Reports (2017)

  18. No Access

    Article

    Advanced Glycation End Product 3 (AGE3) Increases Apoptosis and the Expression of Sclerostin by Stimulating TGF-β Expression and Secretion in Osteocyte-Like MLO-Y4-A2 Cells

    Advanced glycation end products (AGEs) cause bone fragility due to deterioration in bone quality. We previously reported that AGE3 induced apoptosis and inhibited differentiation via increased transforming gro...

    Masakazu Notsu, Ippei Kanazawa, Ayumu Takeno in Calcified Tissue International (2017)

  19. Article

    Open Access

    Preventive Effects of Carnosine on Lipopolysaccharide-induced Lung Injury

    Acute respiratory distress syndrome (ARDS) is a potentially devastating form of acute lung injury, which involves neutrophilic inflammation and pulmonary cell death. Reactive oxygen species (ROS) play importan...

    Ken-Ichiro Tanaka, Toshifumi Sugizaki, Yuki Kanda, Fumiya Tamura in Scientific Reports (2017)

  20. Article

    Open Access

    Aminophylline suppresses stress-induced visceral hypersensitivity and defecation in irritable bowel syndrome

    Pharmacological therapy for irritable bowel syndrome (IBS) has not been established. In order to find candidate drugs for IBS with diarrhea (IBS-D), we screened a compound library of drugs clinically used for ...

    Teita Asano, Ken-ichiro Tanaka, Arisa Tada, Hikaru Shimamura in Scientific Reports (2017)

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