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Kenichi Ohura,Akitake Makinouchi,Cristian Teodosiu,Yutaka Nagai,Jyuichi Nagse 한국소성가공학회 2010 기타자료 Vol.2010 No.6
The warpage of casting parts is a critical issue, especially for large industrial products. Besides, it is difficult to predict the warpage accurately in the casting process because of its complex dependence on mechanical and thermal factors such as the constitutive law of the high temperature metal, the temperature history of the entire part and the restrictions imposed on the deformation by the mold wall. In the present paper, a 3D finite element software V-Shrink developed within the VCAD System Research Program is used to simulate the warpage of an L-plate sand mold casting. It takes into account the thermal coupling between the cast and the mold with non-uniform heat transfer coefficient depending on the local air-gap thickness. 1) The thermo-elastoplastic constitutive law with the temperature dependency of the yield stress is used for the thermal contraction analysis. 2) The simulated warpage of the L-plate casting is in good agreement with the experimental data obtained by a 3D digitizer. Furthermore, the well-known technical finding that the inelastic strain caused by the temperature dependence of the yield stress and the local delay of the temperature drop is a dominant factor of the warpage, is confirmed by the simulation.
Real-time Measurement of Multi-point Strain by Fiber Bragg Gratings using Optical Frequency Sweeping
Yukitaka Shinoda,Yu Sasaki,Kenichi Nagai,Izumi Ogura,Takashi Higo 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper is described how FBG and OFDR can be combined to cover a greater number of locations by using FBGs with identical characteristics in combination with FBGs with different reflection wavelengths. We report on our basic experiments on multi-point strain measurements with a real-time measurement system. It is shown that this system can determine the reflection wavelengths from multiple FBGs with the same reflection wavelength simultaneously every 4 seconds.
Rimi Izumihara,Hiroshi Nomoto,Kenichi Kito,Yuki Yamauchi,Kazuno Omori,Yui Shibayama,Shingo Yanagiya,Aika Miya,Hiraku Kameda,Kyu Yong Cho,So Nagai,Ichiro Sakuma,Akinobu Nakamura,Tatsuya Atsumi 대한당뇨병학회 2024 Diabetes and Metabolism Journal Vol.48 No.3
Background: Fibrates have renal toxicity limiting their use in subjects with chronic kidney disease (CKD). However, pemafibrate has fewer toxic effects on renal function. In the present analysis, we evaluated the effects of pemafibrate on the renal function of diabetic subjects with or without CKD in a real-world clinical setting.Methods: We performed a sub-analysis of data collected during a multi-center, prospective, observational study of the effects of pemafibrate on lipid metabolism in subjects with type 2 diabetes mellitus complicated by hypertriglyceridemia (the PARM-T2D study). The participants were allocated to add pemafibrate to their existing regimen (ADD-ON), switch from their existing fibrate to pemafibrate (SWITCH), or continue conventional therapy (CTRL). The changes in estimated glomerular filtration rate (eGFR) over 52 weeks were compared among these groups as well as among subgroups created according to CKD status.Results: Data for 520 participants (ADD-ON, <i>n</i>=166; SWITCH, <i>n</i>=96; CTRL, <i>n</i>=258) were analyzed. Of them, 56.7% had CKD. The eGFR increased only in the SWITCH group, and this trend was also present in the CKD subgroup (<i>P</i><0.001). On the other hand, eGFR was not affected by switching in participants with severe renal dysfunction (G3b or G4) and/or macroalbuminuria. Multivariate analysis showed that being older and a switch from fenofibrate were associated with elevation in eGFR (both <i>P</i><0.05).Conclusion: A switch to pemafibrate may be associated with an elevation in eGFR, but to a lesser extent in patients with poor renal function.