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Adaptive Collaborative Compensator Design Method for Human-Machine System
Hirofumi Ohtsuka,Koki Shibasato,Shigeyasu Kawaji 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
The control performance of manual controlled human-machine system considerably depends on the skill level of human operator. So, authors have proposed a concept of “Collaborater” which coexists with human operator as a parallel control element and can collaboratively control the machine in order to modify the response of human-machine system. In this report, for the variety of human dynamics, an adaptive collaborater using Neural Network is considered.
Diastematomyelia: A Surgical Case with Long-Term Follow-Up
Hirofumi Bekki,Yuichiro Morishita,Osamu Kawano,Keiichiro Shiba,Yukihide Iwamoto 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.1
Few reports have described the involvement of syringomyelia associated with diastematomyelia in the etiology of neurological deficits. We reported a case with syringomyelia associated with diastematomyelia. A female patient with diastematomyelia was followed up clinically over 14 years. At the age of 8, she developed clubfoot deformity with neurological deterioration. Motor function of the right peroneus demonstrated grade 2 in manual muscle tests. Continuous intracanial bony septum and double cords with independent double dura were observed at upper thoracic spine. Magnetic resonance imaging revealed a tethering of the spinal cord and syringomyelia distal to the level of diastematomyelia. Extirpation of the osseum septum and duralplasty were performed surgically. She grew without neurological deterioration during 7 years postoperatively. A long-term followed up case with syringomyelia that was possibly secondary to the tethering of the spinal cord associated with diastematomyelia, and effective treatment with extirpation of the osseum septum and duralplasty was described.
Hirofumi Akagi 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper discusses a transformerless hybrid active filter integrated into the 6.6-㎸, 1-㎿ adjustable-speed motor drive having a three-phase diode rectifier at the front end. The hybrid filter consists of an active filter using a threelevel diode-clamped PWM converter rated at 60 ㎸A, and a 250-㎸A passive filter tuned to the 7th-harmonic frequency. They are directly connected in series without transformer. This circuit configuration enables to use 1.2-㎸ IGBTs because the dc voltage of the three-level converter is 1.32 ㎸ (20% of 6.6 ㎸). Voltage-balancing control characterized by superimposing a 6thharmonic zero-sequence voltage on the active-filter voltage reference in each phase is introduced to the three-level converter with triangle-carrier modulation. Experimental waveforms obtained from a 400-V 15-㎾ down-scaled system verify the viability and effectiveness of the proposed hybrid filter, keeping the two dccapacitor voltages balanced well.
A New Approach for RTL Power Macro-Modeling
Hirofumi KAWAUCHI,Toshio MORIKAWA,Ryohei MURASHIMA,Ittetsu TANIGUCHI,Masahiro FUKUI 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper presents a new power macro-modeling technique for resister transfer level (RTL). RTL power macro-modeling technique is well known as promising technique for fast power estimation. Our method is based on a table look-up constructed by statistical information extracted from the primary inputs to the circuit. In this paper, we propose a novel power estimation method with a new parameter SD. This parameter characterizes switching activity of an internal circuit. The switching activities of each gate are strongly related with the power consumption. Experimental results show that the proposed method improves RMS error about 10% in average with the ISCAS-85 combinational circuits. The average RMS error of our model was 4.5%.
Hysteresis Model of Low-rise Steel-frame Building and Its Seismic Performance
Hirofumi Aoki,Katsutoshi Ikeda 한국강구조학회 2006 International Journal of Steel Structures Vol.6 No.5
The development of an active sensing node has brought the traditional impedance-based structural health monitoring (SHM)technique to a new paradigm. The active sensing node consists of a miniaturized impedance measuring device (AD5933), amicrocontroller (ATmega128L), and a radio frequency (RF) transmiter (XBee). A macro-fiber composite (MFC) patchincluding structural interrogation, data acquisition, signal procesing, and damage diagnostic is being performed at the sensorlocation by the microcontroller. The RF transmitter is used to comunicate the current status of the host structure. To validatethe feasibility of the proposed active sensor node, two kinds of example studies are carried out: (a) corosion detection on analuminum beam and (b) lose bolt inspection on a bolt-jointed structure.