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Reliability Improvement of Titania Ceramics with Surface Flaw Through High Voltage Screening
Tanaka, Tomohiro,Kishimoto, Akira The Korean Ceramic Society 1999 The Korean journal of ceramics Vol.5 No.4
Effect of high voltage screening was examined on mechanical strength of titania ceramics with two different surface roughness. Roughly finished sample showed degraded mechanical strength meaning that the introduced flaw played the role of starting point of mechanical fracture. On such sample, electrically weak parts were eliminated by applying a screening field. Mechanical strength measurement on survived parts revealed that after screening the Weibull plots bended to become a convex curve while plots at high strength region were almost the same. This result means that relatively low mechanical strength parts were eliminated by the electrical method. As a result the Weibull modulus calculated from all the data increased, demonstrating the effect of high voltage screening on titania ceramics containing fracture controlling surface flaws. Roles of the surface flaw such as a common weak spot for both failures are disscussed in relation to the electric field concentration similar to that of mechanical stress.
Design Consideration of a Secure Sensor Chip for Home Cancer Examination
Tomohiro Tanaka,Kazuya Tanigawa,Tetsuo Hironaka,Takashi Ishiguro 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
We propose a secure sensor chip for disposable medical examination for home use. Secure sensor chip is required to have functions for encryption and authentication to prevent personal information leakage. In this paper, we estimated secure sensor chip implementations by specific hardware and micro-controller respectively. As a result, the implementation of specific hardware is 40% of chip area in terms of NAND gates, compared with the micro-controller one.
Natural History of Early Gastric Cancer: a Case Report and Literature Review
Tomohiro Iwai,Masao Yoshida,Hiroyuki Ono,Naomi Kakushima,Kohei Takizawa,Masaki Tanaka,Noboru Kawata,Sayo Ito,Kenichiro Imai,Kinichi Hotta,Hirotoshi Ishiwatari,Hiroyuki Matsubayashi 대한위암학회 2017 Journal of gastric cancer Vol.17 No.1
Early detection and treatment decrease the mortality rate associated with gastric cancer (GC). However, the natural history of GC remains unclear. An 85-year-old woman was referred to our hospital for evaluation of a gastric tumor. Esophagogastroduodenoscopy identified a 6 mm, flat-elevated lesion at the lesser curvature of the antrum. A biopsy specimen showed a well-differentiated tubular adenocarcinoma.
Hiroki Tanaka,Shimpei Matsusaki,Youichirou Baba,Yoshiaki Isono,Tomohiro Sase,Hiroshi Okano,Tomonori Saito,Katsumi Mukai,Tetsuya Murata,Hiroki Taoka 대한소화기내시경학회 2018 Clinical Endoscopy Vol.51 No.2
Background/Aims: It is sometimes difficult to distinguish between malignant and benign biliary strictures using imaging studiesalone, and pathological diagnosis is necessary. The aim of this study was to determine the usefulness of endoscopic transpapillary tissuesampling and factors predictive of diagnostic accuracy. Methods: From April 2008 to December 2014, 136 patients underwent endoscopic transpapillary tissue sampling for malignantbiliary strictures. The cytological and histological findings were reported as negative, suspicious, or positive. Suspicious and positivefindings were defined as pathologically positive. Results: The sensitivity was 65.0% for forceps biopsy, 49.5% for brush cytology, 46.2% for bile aspiration cytology, and 21.9% forendoscopic nasobiliary drainage cytology. The combination of these procedures improved the sensitivity (72.8%). Endoscopictranspapillary tissue sampling was more sensitive for lesions of biliary origin (91.4%) than for extrabiliary lesions (66.3%). In surgicalcases, the sensitivity for tumors with an infiltrative growth pattern (53.3%) was significantly lower than for a tumor with an expandingor intermediate growth pattern (87.5%). Conclusions: Combining procedures can improve diagnostic accuracy. It may be possible to predict the sensitivity of endoscopictranspapillary tissue sampling by evaluating the etiology and tumor growth pattern using preoperative imaging studies.
Natural History of Early Gastric Cancer: a Case Report and Literature Review
Iwai, Tomohiro,Yoshida, Masao,Ono, Hiroyuki,Kakushima, Naomi,Takizawa, Kohei,Tanaka, Masaki,Kawata, Noboru,Ito, Sayo,Imai, Kenichiro,Hotta, Kinichi,Ishiwatari, Hirotoshi,Matsubayashi, Hiroyuki The Korean Gastric Cancer Association 2017 Journal of gastric cancer Vol.17 No.1
Early detection and treatment decrease the mortality rate associated with gastric cancer (GC). However, the natural history of GC remains unclear. An 85-year-old woman was referred to our hospital for evaluation of a gastric tumor. Esophagogastroduodenoscopy identified a 6 mm, flat-elevated lesion at the lesser curvature of the antrum. A biopsy specimen showed a well-differentiated tubular adenocarcinoma. The depth of the lesion was estimated to be intramucosal. Although the lesion met the indications for endoscopic resection, periodic endoscopic follow-up was performed due to the patient's advanced age and comorbidities. The mucosal GC invaded into the submucosa 3 years later, and finally progressed to advanced cancer 5 years after the initial examination. The patient died of tumor hemorrhage 6.4 years after the initial examination. In this case, mucosal GC progressed to advanced GC, eventually leading to the patient's death from GC. Early and appropriate treatment is required to prevent GC-related death.
Yuki Tanaka,Hideo Dohra,Tomohiro Suzuki,Takeshi Kurokura,Masayuki Iigo,Fubito Toyama,Naoto Habu,Naotake Konno 한국유전학회 2017 Genes & Genomics Vol.39 No.12
The complete mitochondrial genome sequence of the wood-decaying fungus Fomitopsis palustris (Basidiomycete, Agaricomycotina) was determined by next-generation sequencing technology. The complete sequence of the circular mitochondrial DNA of F. palustris was 63,479 bp in length with a 75.98% AT content. The mitochondrial genome encoded 14 conserved proteins, 2 ribosomal RNAs, 26 transfer RNAs, and 19 additional open reading frames. The coxI and cob genes contained six and one group I introns, respectively, and encoded eight open reading frames, including seven intron-encoded endonucleases. The complete mitochondrial genome of F. palustris presented herein represents the first such report for brown rot basidiomycetes. In addition, the BLAST score ratio and phylogenetic analysis may open new avenues to understanding the evolutionary status of this fungus.
Suzuki, Yushi,Tanaka, Ichiro,Sakai, Shigeki,Yamauchi, Tomohiro Korean Society of Plastic and Reconstructive Surge 2021 Archives of Plastic Surgery Vol.48 No.2
Background There are currently no guidelines for the postoperative wound management of the hard-palate donor site in cases involving mucosal harvesting. This study describes our experiences with the use of an artificial dermis for early epithelialization and transparent plate fixation in cases involving hard-palate mucosal harvesting. Methods A transparent palatal plate was custom-fabricated using a thermoplastic resin board. After mucosal harvesting, an alginic acid-containing wound dressing (Sorbsan) was applied to the donor site, which was then covered with the plate. After confirming hemostasis, the dressing was changed to artificial dermis a few days later, and the plate was fixed to the artificial dermis. The size of the mucosal defect ranged from 8×25 to 20×40 mm. Results Plate fixation was adequate, with no postoperative slippage or infection of the artificial dermis. There was no pain at the harvest site, but a slight sense of incongruity during eating was reported. Although the fabrication and application of the palatal plate required extra steps before and after harvesting, the combination of the artificial dermis and palatal plate was found to be very useful for protecting the mucosal harvest site, and resulted in decreased pain and earlier epithelialization. Conclusions The combination of artificial dermis and a transparent palatal plate for wound management at the hard-palate mucosal donor site resolved some of the limitations of conventional methods.