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Kenji Ohwada,Tatsuo Fukuda,Jun’ichiro Mizuki,Kazuma Hirota,Hikaru Terauchi,Satoshi Tsutsui,Alfred Q. R. Baron,Hidehiro Ohwa,Naohiko Yasuda 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
Pb(In_(1/2)Nb_(1/2))O_3 (PIN) can be antiferroelectric (AFE), ferroelectric (FE) or a relaxor depending upon the perovskite B-site randomness. In order to clarify the effect of B-site randomness, we studied the dynamics of ordered PIN without B-site randomness (O-PIN, AFE), which will give us a clear picture of the AFE/relaxor nature of the ground state due to B-site randomness. The quasielastic (QE) scattering shows a critical slowing down near the Γ-point and the transverse acoustic (TA) mode shows a softening trend at a finite wavenumber position (not at the Γ-point) towards the AFE phase transition temperature (T_N ∼ 450 K). On the other hand, the transverse optic (TO) mode shows a softening near the Γ-point toward low temperature with no clear anomaly at T_N. These results indicate that the AFE phase transition is associated with the TA mode and the origin of the QE scattering while a ferroelectric correlation exists behind the AFE ordering. The effect of B-site randomness is finally discussed on the basis of the results.
Hideo Ichikawa,Eisuke Yasuda,Takashi Kumada,Kenji Takeshima,Sadanobu Ogawa,Akikazu Tsunekawa,Tatsuya Goto,Koji Nakaya,Tomoyuki Akita,Junko Tanaka 대한초음파의학회 2023 ULTRASONOGRAPHY Vol.42 No.1
Purpose: Quantitative elastography methods, such as ultrasound two-dimensional shear-wave elastography (2D-SWE) and magnetic resonance elastography (MRE), are used to diagnose liver fibrosis. The present study compared liver stiffness determined by 2D-SWE and MRE within individuals and analyzed the degree of agreement between the two techniques. Methods: In total, 888 patients who underwent 2D-SWE and MRE were analyzed. Bland-Altman analysis was performed after both types of measurements were log-transformed to a normal distribution and converted to a common set of units using linear regression analysis for differing scales. The expected limit of agreement (LoA) was defined as the square root of the sum of the squares of 2D-SWE and MRE precision. The percentage difference was expressed as (2D-SWEMRE)/ mean of the two methods×100. Results: A Bland-Altman plot showed that the bias and upper and lower LoAs (ULoA and LLoA) were 0.0002 (95% confidence interval [CI], -0.0057 to 0.0061), 0.1747 (95% CI, 0.1646 to 0.1847), and -0.1743 (95% CI, -0.1843 to -0.1642), respectively. In terms of percentage difference, the mean, ULoA, and LLoA were -0.5944%, 19.8950%, and -21.0838%, respectively. The calculated expected LoA was 17.1178% (95% CI, 16.6353% to 17.6002%), and 789 of 888 patients (88.9%) had a percentage difference within the expected LoA. The intraclass correlation coefficient of the two methods indicated an almost perfect correlation (0.8231; 95% CI, 0.8006 to 0.8432; P<0.001). Conclusion: Bland-Altman analysis demonstrated that 2D-SWE and MRE were interchangeable within a clinically acceptable range.
Unscheduled Hospitalization in Adults with Congenital Heart Disease
Jun Negishi,Hideo Ohuchi,Kenji Yasuda,Aya Miyazaki,Nakanishi Norifumi,Osamu Yamada 대한심장학회 2015 Korean Circulation Journal Vol.45 No.1
Background and Objectives: Little information is available regarding adult patients with congenital heart disease (CHD) who needed unscheduledhospitalization (USH). This paper aims to elucidate the clinical features of adult patients with CHD requiring USH. Subjects and Methods: Study subjects included patients with CHD aged 18 years or older who were hospitalized at our facility during a5-year study period. Medical records were retrospectively reviewed and data regarding USH were collected. Patient’s background, underlyingheart disease, cause of hospitalization, and prognosis (second USH regardless of cause or death) were examined. Results: Overall, 959 CHD patients underwent a total of 1761 hospitalizations, including 145 patients who were unexpectedly hospitalized239 times. The median age at USH was 27 years old. Of the 959 patients, 54% were male. Underlying heart diseases included repaired tetralogyof Fallot (21%), single ventricular physiology after Fontan operation (17%), and Eisenmenger syndrome (12%). The causes of USH includedarrhythmia (40%), heart failure (20%), infectious disease (13%), and hemorrhage or thrombus (13%). A total of 48 patients requiredreadmission. In total, 13 patients died, including four hospital deaths. The USH-free survival rate was 77% for 1 year and 58% for 3 years. Conclusion: The rate of USH was high for adults with complicated CHD. Common causes of USH included arrhythmia, heart failure, hemorrhage-related or thrombus-related conditions and infection. These data provide the current status of medical care for adult CHD patientsin Japan and their therapeutic needs.
An Output Synchronization Control Design for Systems with Input Magnitude Constraints
Keigo Nishigami,Yoshihito Yasuda,Kenji Hirata 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes design procedures for output synchronization problems where each plantis subject to control magnitude constraints. To motivate the present control design problem, we first show that existing output synchronization control law, which modifies primal reference inputs to obtain better output synchronizations, provides adequate synchronization performance, however, it tends to be high gain controls and becomes difficult for practical implementations due to well known input saturation phenomena and resulting serius performance deterioration. To over come the problem, we propose output synchronization and Reference Governor combined control systems design procedures. Effectiveness of the proposed methods is validated through experimental evaluations.