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Hiroki Taniguchi,Masaki Takesada,Mitsuru Itoh,Toshirou Yagi 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
The oxygen-isotope exchange eect on the ferroelectric micro-regions (FMR) in SrTiO3 is investigated by Raman scattering in the low-temperature region near 1 K by using a 3He cryostat. With decreasing temperature, the intensity of the FMR spectra decreases and a sharp peak newly appears with increasing intensity. The sharp peak is assigned to be the polar Eu mode activated by local symmetry breaking induced by the growth of FMR.
Function-level module sharing techniques in high-level synthesis
Nishikawa, Hiroki,Shirane, Kenta,Nozaki, Ryohei,Taniguchi, Ittetsu,Tomiyama, Hiroyuki Electronics and Telecommunications Research Instit 2020 ETRI Journal Vol.42 No.4
High-level synthesis (HLS), which automatically synthesizes a register-transfer level (RTL) circuit from a behavioral description written in a high-level programming language such as C/C++, is becoming a more popular technique for improving design productivity. In general, HLS tools often generate a circuit with a larger area than those of hand-designed ones. One reason for this issue is that HLS tools often generate multiple instances of the same module from a function. To eliminate such a redundancy in circuit area in HLS, HLS tools are capable of sharing modules. Function-level module sharing at a behavioral description written in a high-level programming language may promote function reuse to increase effectiveness and reduce circuit area. In this paper, we present two HLS techniques for module sharing at the function level.
Strong anisotropy of ferroelectricity in lead-free bismuth silicate.
Seol, Daehee,Taniguchi, Hiroki,Hwang, Jae-Yeol,Itoh, Mitsuru,Shin, Hyunjung,Kim, Sung Wng,Kim, Yunseok RSC Pub 2015 Nanoscale Vol.7 No.27
<P>Bismuth silicate (Bi2SiO5) was recently suggested as a potential silicate based lead-free ferroelectric material. Here, we show the existence of ferroelectricity and explore the strong anisotropy of local ferroelectricity using piezoresponse force microscopy (PFM). Domain structures are reconstructed using angle-resolved PFM. Furthermore, piezoresponse hysteresis loops and piezoelectric coefficients are spatially investigated at the nanoscale. The obtained results confirm the existence of ferroelectricity with strong c-axis polarization. These results could provide basic information on the anisotropic ferroelectricity in Bi2SiO5 and furthermore suggest its considerable potential for lead-free ferroelectric applications with silicon technologies.</P>
Sawamura Akinori,Kajiura Hiroki,Sumi Takuya,Umemoto Norio,Sugiura Tsuyoshi,Taniguchi Toshio,Ohashi Masako,Asai Toru,Shimizu Kiyokazu,Murohara Toyoaki 대한심부전학회 2021 International Journal of Heart Failure Vol.3 No.2
Background and Objectives The clinical significance of worsening renal function (WRF) in elderly patients with acute decompensated heart failure (ADHF) is not completely understood. We compared the clinical conditions between younger and elderly patients with ADHF after the appearance of WRF to establish its prognostic influence. Methods We included 654 consecutive patients (37% women) admitted for ADHF. We divided the patients into four groups according to their age (<80 years, under-80, n=331; ≥80 years, over-80, n=323) and to their WRF statuses (either WRF or non-WRF group). We defined WRF as an increase in serum creatinine level ≥0.3 mg/dL or ≥150% within 48 hours after hospital arrival (under-80, n=62; over-80, n=75). The primary endpoint was a composite of cardiac events within 1 year. Results The survival analyses revealed that the WRF group had significantly more cardiac events than the non-WRF group in patients in the over-80 group (log-rank p=0.025), but not in those of the under-80 group (log-rank p=0.50). The patients in the over-80, WRF group presented more significant mean blood pressure (MBP) drops than those in the over-80 non-WRF group (p=0.003). Logistic regression analyses revealed that higher MBP at admission was a significant predictor of WRF. Conclusions WRF is a predictor of poor outcomes in elderly patients with ADHF. Background and Objectives The clinical significance of worsening renal function (WRF) in elderly patients with acute decompensated heart failure (ADHF) is not completely understood. We compared the clinical conditions between younger and elderly patients with ADHF after the appearance of WRF to establish its prognostic influence. Methods We included 654 consecutive patients (37% women) admitted for ADHF. We divided the patients into four groups according to their age (<80 years, under-80, n=331; ≥80 years, over-80, n=323) and to their WRF statuses (either WRF or non-WRF group). We defined WRF as an increase in serum creatinine level ≥0.3 mg/dL or ≥150% within 48 hours after hospital arrival (under-80, n=62; over-80, n=75). The primary endpoint was a composite of cardiac events within 1 year. Results The survival analyses revealed that the WRF group had significantly more cardiac events than the non-WRF group in patients in the over-80 group (log-rank p=0.025), but not in those of the under-80 group (log-rank p=0.50). The patients in the over-80, WRF group presented more significant mean blood pressure (MBP) drops than those in the over-80 non-WRF group (p=0.003). Logistic regression analyses revealed that higher MBP at admission was a significant predictor of WRF. Conclusions WRF is a predictor of poor outcomes in elderly patients with ADHF.
Suzuki, Motohiro,Kim, Kab-Jin,Kim, Sanghoon,Yoshikawa, Hiroki,Tono, Takayuki,Yamada, Kihiro T.,Taniguchi, Takuya,Mizuno, Hayato,Oda, Kent,Ishibashi, Mio JAPAN SOCIETY OF APPLIED PHYSICS 2018 Applied physics express Vol.11 No.3
<P>An X-ray tomographic technique was developed to investigate the internal magnetic domain structure in a micrometer-sized ferromagnetic sample. The technique is based on a scanning hard X-ray nanoprobe using X-ray magnetic circular dichroism (XMCD). From transmission XMCD images at the Gd L-3 edge as a function of the sample rotation angle, the three-dimensional (3D) distribution of a single component of the magnetic vector in a GdFeCo microdisc was reconstructed with a spatial resolution of 360 nm, using a modified algebraic reconstruction algorithm. The method is applicable to practical magnetic materials and can be extended to 3D visualization of the magnetic domain formation process under external magnetic fields. (C) 2018 The Japan Society of Applied Physics</P>
Indium-Free Amorphous Ca-Al-O Thin Film as a Transparent Conducting Oxide
Sim, So Hee,Kang, Kyeong Tae,Lee, Sangyun,Lee, Miso,Taniguchi, Hiroki,Kim, Suyoung,Roh, Seulki,Oh, Jun Hyeob,Lee, Sang A,Bae, Jong-Seong,Jang, Jae Hyuck,Hwang, Jungseek,Han, Seungwu,Park, Tuson,Choi, American Chemical Society 2019 Chemistry of materials Vol.31 No.19
<P>Transparent conducting oxide (TCO) is a promising material system for transparent electrodes, which is one of the most essential elements in current electronic and energy devices. In particular, In-based TCOs such as Sn:In<SUB>2</SUB>O<SUB>3</SUB> (ITO) and In-Ga-Zn-O (IGZO) have shown large optical band gap and high electrical conductivity, sufficient for the applications. However, In is an expensive element, which hampers its facile industrial application. Moreover, In-based TCOs show an abrupt decrease in conductivity when their thickness decreases below ∼100 nm, possibly due to inhomogeneity within the thin films. Here, we introduce an amorphous Ca-Al-O (CAO) thin film as a promising candidate for the In-free TCOs. The amorphous CAO thin film has very low resistivity (∼10<SUP>-5</SUP> Ω cm) at room temperature, as well as high transparency in the visible region of the light spectrum (>80%). The isotropic Ca <I>s</I>-orbital in the conduction band is found to be responsible for the superior performance of CAO as a TCO. Owing to the exceptional structural homogeneity of the CAO thin film, thickness-independent transport characteristics are observed, maintaining its TCO performance down to 10 nm of thickness.</P> [FIG OMISSION]</BR>