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Study on laser assisted milling of ferrous based consolidated material
Tatsuaki Furumoto,Takashi Ueda,Teruyuki Osaka,Abdullah Yassin,Akira Hosokawa,Ryutaro Tanaka 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.1
This study deals with the laser beam assisted milling to improve the machinability of a consolidated structure formed by layered manufacturing processes. The laser beam used is a continuous CO2 laser with a maximum output power of 100 W. The metal powder for layered manufacturing is a ferrous-based mixture. To investigate the influence of laser conditions on the machinability, specific cutting force,tool wear and tool temperature of the flank face are measured. The results showed that the specific cutting force of the consolidated structure was decreased by the effect of energy input on the structure surface. The progress of wear on the flank face assisted by the laser beam was 20% slower due to the softening of the consolidated structure and the melting of the powder which remained on the structure surface. The dimensional accuracy and surface finishing of the consolidated structure were influenced by the rise of the tool temperature on the flank face.
Jun-ichi Furumoto,Tomonori Shinoda,Toshitaka Tsuda 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This study applied the Frequency-domain Interferometric Imaging (FII) technique to Radio Acoustic Sounding System (RASS) measurement to improve the vertical resolution of temperature profiles obtained by RASS measurements. The FII technique was applied to RASS imaging measurements performed using the Middle and Upper atmosphere (MU) radar on October 29-31, 2006. The temperature profiles inside the radar range volume with the temporal resolution of 26 minutes were successfully estimated. The detailed temperature structure was revealed in the FII results. In particular, the detailed inversion layers structure inside the radar range gate were in good agreement with the simultaneous radiosonde results.
Study on tool wear mechanisms in milling laser sintered material
Abdullah Yassin,Takashi Ueda,Tatsuaki Furumoto,Mohd Sanusi Abdul Aziz,Ryutaro Tanaka,Akira Hosokawa 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.1
This paper investigates tool wear mechanisms of a ball end mill in cutting laser sintered material. Cutting edge temperature is measured by using a three-color pyrometer with an optical fiber. Bulk carbon steel JIS S55C is selected as the standard steel. Experimental results show that tool life in cutting sintered material is shorter than that in cutting JIS S55C. Observations by SEM show that adhesion of the work material and micro chipping are the main wear mechanisms in cutting sintered material. The corresponding cutting edge temperature shows a continuous increase as wear evolves with cutting time.
Kang, Jae Myeong,Lee, Sang-Yoon,Seo, Seongho,Jeong, Hye Jin,Woo, Sung-Ho,Lee, Hyon,Lee, Yeong-Bae,Yeon, Byeong Kil,Shin, Dong Hoon,Park, Kee Hyung,Kang, Hyejin,Okamura, Nobuyuki,Furumoto, Shozo,Yanai, Elsevier 2017 NEUROBIOLOGY OF AGING Vol. No.
<P><B>Abstract</B></P> <P>This study aims to evaluate the clinical validity of [<SUP>18</SUP>F]THK5351 positron emission tomography (PET) for the assessment of disease progression and symptoms in Alzheimer's disease (AD). Fifty-one patients with AD dementia, 30 patients with amnestic mild cognitive impairment (aMCI), and 43 controls with normal cognition (NC) were included. All subjects underwent [<SUP>18</SUP>F]THK5351 PET, 3.0-T magnetic resonance imaging, and detailed neuropsychological tests. Regions of interest and voxel-based statistical analyses were performed. In patients with AD dementia, [<SUP>18</SUP>F]THK5351 retention was greater in most association cortices as well as the limbic area compared to NC or aMCI participants. Patients with aMCI also showed higher THK5351 retention in those areas compared to NC. [<SUP>18</SUP>F]THK5351 retention significantly correlated with neuropsychological test results. Negative correlations between [<SUP>18</SUP>F]THK5351 and [<SUP>18</SUP>F] fluorodeoxyglucose were observed in AD dementia and aMCI groups. Mirror images of [<SUP>18</SUP>F]THK5351 retention and glucose hypometabolism in [<SUP>18</SUP>F] fluorodeoxyglucose were noticeable in the focal variants of AD. [<SUP>18</SUP>F]THK5351 PET reflects disease severity and symptoms in AD. Our results suggest [<SUP>18</SUP>F]THK5351 is reflective of tau-related AD pathology.</P>