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Temperature Dependence of the Coercive Force of Ferromagnetic TM-Al-O (TM=Fe, Co) Granular Films
Shintaro Nakamura,Tsutomu Nojima,Akira yoshihara,Shigehiro Ohnuma 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The temperature dependence of the coercive force (Hc) of ferromagnetic TM–Al–O (TM=Fe, Co)granular films has been investigated in the temperature range from 290 down to 2 K. Fe–Al–O filmsshow weak anisotropy. In contrast, Co–Al–O films show clear in-plain anisotropy. The coerciveforces of Co–Al–O films show a logarithmic temperature dependence at low temperatures whilethose of Fe–Al–O films are almost independent of temperature.
Design of a Low-Order Sensorless Controller by Robust H∞ Control for Boost Converters
Li, Xutao,Chen, Minjie,Shinohara, Hirofumi,Yoshihara, Tsutomu The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
Luenberger observer (LO)-based sensorless multi-loop control of a converter requires an iterative trial-and-error design process, considering that many parameters should be determined, and loop gains are indirectly related to the closed-loop characteristics. Robust H∞ control adopts a compact sensorless controller. The algebraic Riccati equation (ARE)-based and linear matrix inequality (LMI)-based H∞ approaches need an exhaustive procedure, particularly for a low-order controller. Therefore, in this study, a novel robust H∞ synthesis approach is proposed to design a low-order sensorless controller for boost converters, which need not solve any ARE or LMI, and to parameterize the controller by an adjustable parameter behaving like a "knob" on the closed-loop characteristics. Simulation results show the straightforward closed-loop characteristics evaluation and better dynamic performance by the proposed H∞ approach, compared with the LO-based sensorless multi-loop control. Practical experiments on a digital processor confirmed the simulation results.
Design of a Low-Order Sensorless Controller by Robust H∞ Control for Boost Converters
Xutao Li,Minjie Chen,Hirofumi Shinohara,Tsutomu Yoshihara 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
Luenberger observer (LO)-based sensorless multi-loop control of a converter requires an iterative trial-and-error design process, considering that many parameters should be determined, and loop gains are indirectly related to the closed-loop characteristics. Robust H∞ control adopts a compact sensorless controller. The algebraic Riccati equation (ARE)-based and linear matrix inequality (LMI)-based H∞ approaches need an exhaustive procedure, particularly for a low-order controller. Therefore, in this study, a novel robust H∞ synthesis approach is proposed to design a low-order sensorless controller for boost converters, which need not solve any ARE or LMI, and to parameterize the controller by an adjustable parameter behaving like a “knob” on the closed-loop characteristics. Simulation results show the straightforward closed-loop characteristics evaluation and better dynamic performance by the proposed H∞ approach, compared with the LO-based sensorless multi-loop control. Practical experiments on a digital processor confirmed the simulation results.
Design of a Luenberger Observer–based Current Sensorless Multi-loop Control for Boost Converters
Xutao Li,Minjie Chen,Hirofumi Shinohara,Tsutomu Yoshihara 대한전자공학회 2016 IEIE Transactions on Smart Processing & Computing Vol.5 No.1
Multi-loop control of a boost converter needs a current-sensing circuit to detect the inductor current. Current sensorless multi-loop control reduces the cost, size and weight of the converter. The Luenberger observer (LO) is widely used to estimate the inductor current for current sensorless control of a switching converter. However, the design of the LO-based sensorless multiloop control has not been well presented, so far. In this paper, a closed-loop characteristics evaluation method is proposed to design an LO-based current sensorless multi-loop control for boost converters. Simulations show evaluations of the closed-loop characteristics. Practical experiments on a digital processor confirm the simulations.
Dynamic Response Improvement of Feedforward Combined Multi-loop Control for Boost Converters
Xutao Li,Minjie Chen,Shinohara Hirofumi,Yoshihara Tsutomu 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
The dynamic response of a converter is determined by its closed-loop characteristics including the audio susceptibility and output impedance. Although multiloop control can improve the dynamic response of a boost converter in continuous conduction mode, there is no freedom of respectively adjusting the closed-loop audio susceptibility and output impedance because the disturbance attenuation is mainly achieved only by one compensator - the outer voltage loop compensator. An input voltage feedforward can only be used to adjust the audio susceptibility. In this paper, the load current feedforward combined multi-loop control is proposed for boost converters to improve the dynamic response to the load disturbance. Simulations and practical experiments show that better dynamic performance is maintained by the proposed controller.
Energy Efficient Processing Engine in LDPC Application with High-Speed Charge Recovery Logic
Zhang, Yimeng,Huang, Mengshu,Wang, Nan,Goto, Satoshi,Yoshihara, Tsutomu The Institute of Electronics and Information Engin 2012 Journal of semiconductor technology and science Vol.12 No.3
This paper presents a Processing Engine (PE) which is used in Low Density Parity Codec (LDPC) application with a novel charge-recovery logic called pseudo-NMOS boost logic (pNBL), to achieve high-speed and low power dissipation. pNBL is a high-overdriven and low area consuming charge recovery logic, which belongs to boost logic family. Proposed Processing Engine is used in LDPC circuit to reduce operating power dissipation and increase the processing speed. To demonstrate the performance of proposed PE, a test chip is designed and fabricated with 0.18 2m CMOS technology. Simulation results indicate that proposed PE with pNBL dissipates only 1 pJ/cycle when working at the frequency of 403 MHz, which is only 36% of PE with the conventional static CMOS gates. The measurement results show that the test chip can work as high as 609 MHz with the energy dissipation of 2.1 pJ/cycle.
Energy Efficient Processing Engine in LDPC Application with High-Speed Charge Recovery Logic
Yimeng Zhang,Mengshu Huang,Nan Wang,Satoshi Goto,Tsutomu Yoshihara 대한전자공학회 2012 Journal of semiconductor technology and science Vol.12 No.3
This paper presents a Processing Engine (PE) which is used in Low Density Parity Codec (LDPC) application with a novel charge-recovery logic called pseudo-NMOS boost logic (pNBL), to achieve high-speed and low power dissipation. pNBL is a high-overdriven and low area consuming charge recovery logic, which belongs to boost logic family. Proposed Processing Engine is used in LDPC circuit to reduce operating power dissipation and increase the processing speed. To demonstrate the performance of proposed PE, a test chip is designed and fabricated with 0.18 ㎛ CMOS technology. Simulation results indicate that proposed PE with pNBL dissipates only 1 pJ/cycle when working at the frequency of 403 ㎒, which is only 36% of PE with the conventional static CMOS gates. The measurement results show that the test chip can work as high as 609 ㎒ with the energy dissipation of 2.1 pJ/cycle.
Zhang, Hao,Huang, Meng-Shu,Zhang, Yi-Meng,Yoshihara, Tsutomu The Institute of Electronics and Information Engin 2014 Journal of semiconductor technology and science Vol.14 No.1
A nano-power CMOS voltage reference is proposed in this paper. Through a combination of switched-capacitor technology with the body effect in MOSFETs, the output voltage is defined as the difference between two gate-source voltages using only a single PMOS transistor operated in the subthreshold region, which has low sensitivity to the temperature and supply voltage. A low output, which breaks the threshold restriction, is produced without any subdivision of the components, and flexible trimming capability can be achieved with a composite transistor, such that the chip area is saved. The chip is implemented in $0.18{\mu}m$ standard CMOS technology. Measurements show that the output voltage is approximately 123.3 mV, the temperature coefficient is $17.6ppm/^{\circ}C$, and the line sensitivity is 0.15 %/V. When the supply voltage is 1 V, the supply current is less than 90 nA at room temperature. The area occupation is approximately $0.03mm^2$.
Natural History of Chronic Intestinal Pseudo-obstruction and Need for Palliative Care
Kosuke Tanaka,Hidenori Ohkubo,Atsushi Yamamoto,Kota Takahashi,Yuki Kasai,Anna Ozaki,Michihiro Iwaki,Takashi Kobayashi,Tsutomu Yoshihara,Noboru Misawa,Akiko Fuyuki,Shingo Kato,Takuma Higurashi,Kunihiro 대한소화기 기능성질환∙운동학회 2023 Journal of Neurogastroenterology and Motility (JNM Vol.29 No.3
Background/AimsNatural history of chronic intestinal pseudo-obstruction (CIPO), a rare disease characterized by episodes of non-mechanical obstruction, is unclear in adults. This study evaluates the clinical course of CIPO and palliative care needs of patients. MethodsFrom October 2010 to September 2021, 74 patients who underwent cine MRI and had a definitive diagnosis of CIPO were prospectively included. We investigated disease etiology and outcomes, age at onset, nutritional status at consultation (body mass index and serum albumin), hydrogen breath test results, and total parenteral nutrition (TPN) during the disease course. ResultsForty-seven patients (64%) were women, with a mean age of 44 years at onset and 49 years at diagnosis. Primary CIPO was observed in 48 patients (65%). Secondary CIPO was observed in 26 cases (35%), of whom 18 (69%) had scleroderma. The mean body mass index, serum albumin level, and hydrogen breath test positivity rate were 17 kg/m2, 3.8 mg/dL, and 60%, respectively. TPN and invasive decompression therapy were required by 23 (31%) and 18 (24%) patients, respectively. Intestinal sterilization was performed in 51 (69%) patients and was effective in 33 (65%); of these, 28 (85%) were taking metronidazole. Seven (9%) patients used opioids. There were 9 deaths (12%), including 5 (56%) from infection and 2 (22%) from suicide. Of the deaths, 6 (67%) and 4 (44%) underwent TPN management and decompression therapy, respectively. Fifty-one patients (69%) wanted palliative care. ConclusionCIPO is a rare, severe, and under-recognized disease. Standardization of treatment strategies, including palliative care and psychiatric interventions, is desired.