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Microstructural Study of Creep-Fatigue Crack Propagation for Sn-3.0Ag-0.5Cu Lead-Free Solder
Woo, Tae-Wuk,Sakane, Masao,Kobayashi, Kaoru,Park, Hyun-Chul,Kim, Kwang-Soo The Korean Microelectronics and Packaging Society 2010 마이크로전자 및 패키징학회지 Vol.17 No.3
Crack propagation mechanisms of Sn-3.0Ag-0.5Cu solder were studied in strain controlled push-pull creepfatigue conditions using the fast-fast (pp) and the slow-fast (cp) strain waveforms at 313 K. Transgranular cracking was found in the pp strain waveform which led to the cycle-dominant crack propagation and intergranular cracking in the cp strain waveform that led to the time-dominant crack propagation. The time-dominant crack propagation rate was faster than the cycle-dominant crack propagation rate when compared with J-integral range which resulted from the creep damage at the crack tip in the cp strain waveform. Clear recrystallization around the crack was found in the pp and the cp strain waveforms, but the recrystallized grain size in the cp strain waveform was smaller than that in the pp strain waveform. The cycle-dominant crack propagated in the normal direction to the specimen axis macroscopically, but the time-dominant crack propagated in the shear direction which was discussed in relation with shear micro cracks formed at the crack tip.
Kengo Fujii,Masataka Sakane,Tetsuya Abe,Tsukasa Nakagawa,Shinsuke Sakai,Masaki Tatsumura,Toru Funayama,Masashi Yamazaki 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.6
Study Design: Retrospective, radiological study. Purpose: To determine the relationship between clinical symptoms and the extent of tumor occupation of the spinal canal by cauda equina schwannoma. Overview of Literature: Little is known about the relationship between the size of tumors of the cauda equina and the manifestation of clinical symptoms. We analyzed this relationship by estimating the percentage of tumor occupation (PTO) in the spinal canal in cauda equina schwannomas and by correlating this parameter with the presence and severity of clinical symptoms. Methods: Twenty-two patients (9 men and 13 women; age, 19–79 years; mean age, 55.3 years) who were radiologically diagnosed with schwannomas of the cauda equina between April 2004 and July 2014 were retrospectively analyzed. PTO was measured in axial and sagittal magnetic resonance imaging slices in which the cross-sectional area of the tumor was the largest. Data regarding clinical symptoms and results of physical examinations were collected from patient medical records. PTO differences between symptompositive and -negative groups were analyzed for each variable. Results: In the 4 cases in which tumor presence was not related to clinical symptoms, PTO was 5%–10% (mean, 9%) in axial slices and 23%–31% (mean, 30%) in sagittal slices. In the 18 cases in which symptoms were associated with the tumor, PTO was 11%–86% (mean, 50%) in axial slices and 43%–88% (mean, 71%) in sagittal slices. PTO in axial slices was significantly higher in the presence of Déjèrine symptoms and/or muscle weakness, a positive straight leg raise test, and a positive Kemp sign. Conclusions: PTO >20% in axial slices and >40% in sagittal slices can be an indication of symptomatic cauda equina schwannoma.
Leptin:Adiponectin Ratio and Metabolic Syndrome in the General Japanese Population
Kazuhiko Kotani,Naoki Sakane 대한진단검사의학회 2011 Annals of Laboratory Medicine Vol.31 No.3
Background: Circulating leptin:adiponectin ratio (L:A) is a potential surrogate marker for cardiometabolic diseases; however, the relationship of the L:A with the occurrence of metabolic syndrome (MetS) has not yet been fully explored in the general Japanese population. Methods: We enrolled 678 Japanese subjects (208 men and 470 women, mean age: 58.8±14.4 [SD] yr; mean body mass index: 23.6±3.3 kg/m2) in this study, and determined their MetS status by using the National Cholesterol Education Program-Adult Treatment Panel (NCEP-ATP) recommendations with minor modifications for the Japanese population. Biochemical markers such as leptin and adiponectin present in blood were measured. The statistical analyses performed were gender-based. Results: The L:A in subjects with MetS was significantly higher than that in subjects without MetS, regardless of gender. The L:A also showed a significant and gradual increase corresponding to the increase in the number of components of MetS present in both the genders (trend P<0.01). The cut-off level of the L:A to detect MetS was 0.59 (sensitivity: 0.72, specificity: 0.70) in men and 1.04 (sensitivity: 0.72, specificity: 0.69) in women. Conclusions: These results suggest that the L:A can serve as a clinically useful marker for detecting MetS characteristics in the general Japanese population. The clinical application of this laboratory index for detecting MetS should be assessed in future studies. Background: Circulating leptin:adiponectin ratio (L:A) is a potential surrogate marker for cardiometabolic diseases; however, the relationship of the L:A with the occurrence of metabolic syndrome (MetS) has not yet been fully explored in the general Japanese population. Methods: We enrolled 678 Japanese subjects (208 men and 470 women, mean age: 58.8±14.4 [SD] yr; mean body mass index: 23.6±3.3 kg/m2) in this study, and determined their MetS status by using the National Cholesterol Education Program-Adult Treatment Panel (NCEP-ATP) recommendations with minor modifications for the Japanese population. Biochemical markers such as leptin and adiponectin present in blood were measured. The statistical analyses performed were gender-based. Results: The L:A in subjects with MetS was significantly higher than that in subjects without MetS, regardless of gender. The L:A also showed a significant and gradual increase corresponding to the increase in the number of components of MetS present in both the genders (trend P<0.01). The cut-off level of the L:A to detect MetS was 0.59 (sensitivity: 0.72, specificity: 0.70) in men and 1.04 (sensitivity: 0.72, specificity: 0.69) in women. Conclusions: These results suggest that the L:A can serve as a clinically useful marker for detecting MetS characteristics in the general Japanese population. The clinical application of this laboratory index for detecting MetS should be assessed in future studies.
Keita Nakayama,Masataka Sakane,Susumu Ejima,Daisuke Ito,Tomofumi Nishino,Sou Kitajima,Masashi Yamazaki 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.6
Study Design: Prospective experimental study on humans. Purpose: To determine whether postural differences during a low-speed impact are observed in the sagittal and axial views, particularly in a relaxed state. Overview of Literature: Three-dimensional motion capture systems have been used to analyze posture and head-neck-torso kinematics in humans during a simulated low-speed impact, yet little research has focused on the axial view. Since a seatbelt asymmetrically stabilizes a driver’s right shoulder and left lower waist into the seat, it potentially creates movement in the axial view. Methods: Three healthy adult men participated in the experimental series, which used a low-speed sled system. The acceleration pulse created a full sine shape with a maximum acceleration of 8.0 m/s2 at 500 ms, during which the kinematics were evaluated in relaxed and tensed states. The three-dimensional motion capture system used eight markers to record and analyze body movement and head-neck-torso kinematics in the sagittal and axial views during the low-speed impact. Head and trunk rotation angles were also calculated. Results: Larger movements were observed in the relaxed than in the tensed state in the sagittal view. The cervical and thoracic spine flexed and extended, respectively, in the relaxed state. In the axial view, larger movements were also observed in the relaxed state than in the tensed state, and the left shoulder rotated. Conclusions: During simulated frontal impact, the rotation angle between the head and trunk was significantly larger in the relaxed state. Therefore, we recommend also observing movement in the axial view during impact tests.
Katsuya Hirachi,Makoto Sakane,Takanori Mii,Mutsuo Nakaoka 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
It is essential characteristics for uninterruptible power supply (UPS) to eliminate harmonic currents in its input current and to get unity power factor. Switched mode rectifier (SMR) with a high -frequency transformer link has promising characteristics as a AC/DC conversion circuit for UPS. It does not only eliminate harmonic currents but also provides an isolation between AC input and DC output with a small high frequency transformer. We applied the SMR for the development of UPS with capacity of 2kVA, 3kVA and 5kVA. This paper presents circuit configurations and control strategies of the SMR and the test results of the developed UPS.
Arata Watanabe,Masataka Sakane,Toru Funayama,Masashi Iwasashi,Akihiro Kanamori,Naoyuki Ochiai 한국생체재료학회 2010 생체재료학회지 Vol.14 No.1
A microstructure of unidirectional porous hydroxyapatite (UDPHAp) has a diameter of 100-300 μm, which pene-trates through the material. In addition, it has a porosity of 75% and initial compression strength of approximately 14 MPa. The objective of the present study was to investigate the feasibility of UDPHAp for the tibial wedge osteot-omy in canines. We performed the operation on the right tibia of the dogs, and a wedge-shaped UDPHAp was implanted in the gap after the osteotomy. At 6 and 12 weeks after the operation, the specimens were solid and bony union could be macroscopically observed. Radiological examination revealed that complete consolidation between the osteotomy site and the UDPHAp was established at 12 weeks. Histological evaluation revealed fibrous tissues between the host bone and the UDPHAp at 6 weeks, although new bone formation was observed at the edges of the material. At 12 weeks, direct bonding and bone ingrowth was observed. This study indicates that UDPHAp has great potential for use as a bone substitute for open-wedge high tibail osteotomy in clinical condition.