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Inference of Plastic Deformation in Weldment with Parallel Cracks from Infrared Thermography
Tanaka, Yuichi,Oda, Isamu,Nakano, Akira,Murao, Yuji 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
Tensile tests are carried out by using the welded plate with two parallel cracks. The effects of the residual stress, the hardened zone by welding and the interaction between cracks on the plastic deformation near cracks and the crack opening displacement are examined by the experiment as well as the elasto plastic finite element analysis. A new technique for evaluating nondestructively the plastic deformation near cracks by using the infrared thermography is proposed. The heated region and the temperature rise measured by the thermography are compared with the plastic zone and the work of plastic deformation obtained by the analysis. The validity and the limitations of the application of the infrared thermography to the evaluation of the plastic deformation are discussed.
Rotational Acetabular Osteotomy
Yuji Yasunaga,Jiro Fujii,Ryuji Tanaka,Shinji Yasuhara,Takuma Yamasaki,Nobuo Adachi,Mitsuo Ochi 대한정형외과학회 2017 Clinics in Orthopedic Surgery Vol.9 No.2
Hip dysplasia is the most common cause of secondary osteoarthritis (OA). To prevent the early onset of secondary OA, Nishio’s transposition osteotomy, Steel’s triple osteotomy, Eppright’s dial osteotomy, Wagner’s spherical acetabular osteotomy, Tagawa’s rotational acetabular osteotomy (RAO), and Ganz’ periacetabular osteotomy (PAO) have been proposed. PAO and RAO are now commonly used in surgical treatment of symptomatic acetabular dysplasia in Europe, North America, and Asia. The aim of this paper is to present the followings: the patient selection criteria for RAO; the surgical technique of RAO; the long-term outcome of RAO; and the future perspectives.
Distributed Feedback Waveguide Laser of Organic Nano-compound Material
Tanaka, Masamitsu,Oki, Yuji,Nagano, Daisuke,An, Byeong-Kwan,Park, Soo Young,Maeda, Mitsuo TaylorFrancis 2007 MOLECULAR CRYSTALS AND LIQUID CRYSTALS - Vol.463 No.1
<P> The laser action was firstly demonstrated using 1-cyano-trans-1,2-bis-(4'-methylbiphenyl)ethylene (CN-MBE), that enhances its fluorescence from organic nanoparticle. The CN-MBE is not fluorescent and has enhanced fluorescence in aggregated nanoparticle state. CN-MBE doped PMMA film showed fluorescence over 400 ∼ 600 nm and spectral narrowed emission at 430 nm under pumping with a nanosecond pulsed laser at wavelength of 355 nm. CN-MBE:PMMA DFB laser waveguides were successfully fabricated, and lasing wavelength was over 430 to 490 nm. CN-MBE:PMMA DFB lasers showed laser threshold of 73 µJ/cm2 at the waveguide size of 15 mm × 100 µm × 5 µm. The output spectra had bandwidth as narrow as 60 pm FWHM, and suppressed fluorescence background of less than 0.5%. The maximum peak power and average power were estimated to be 5 W and 0.35 µW, respectively. The durability was as long as 1.7 × 104 shots/waveguide.</P>
Centralized P2P Management System Based on File and Peer Reputation
Wei Tian,Yuji Sekiya,Yasushi Wakahara,Yoshiaki Tanaka 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In recent years, P2P file sharing systems have become one of the most popular applications in networks. However, because of the nature of the openness and anonymity of P2P applications, it is very hard to control peers that can join the system and also to trace the originating peers of shared files. Therefore, P2P systems have also become an avenue of attack and in practice a lot of malicious files are shared in P2P systems in addition to legitimate files. In order to manage P2P networks and prevent the malicious files from spreading, we propose a centralized P2P management system (C2MS) using the reputation of both file and peer. Some simulation results demonstrate that our proposed C2MS can work well even in serious attack situation.
Improving the Robustness of Lips Sensing with Evolutionary Video Processing
Takuya Akashi,Yuji Wakasa,Kanya Tanaka,Minoru Fukumi 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, an effective method is proposed for robust lips sensing. Our objectives are high-speed lips tr acking and data acquisition of a talking person in natural scenes. Our approach is based on the Evolutionary Video Processing. This method has a trade-off between accuracy and a processing time. To solve this problem, we proposed automatic Search Domain Control method and implement this method in the Evolutionary Video Processing. The tracking accuracy is improved from 66.3% to 84.9%. The proposed method can recover from occlusion and tracking loss. Comparative experiments are presented to demonstrate the effectiveness and robustness of the proposed method.