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Yuki Tokuda,Daichi Tsubokura,Eiji Ohmichi,Hitoshi Ohta 한국자기학회 2013 Journal of Magnetics Vol.18 No.2
Cantilever-detected high-frequency electron spin resonance (ESR) is a powerful method of sub-terahertz and terahertz ESR spectroscopy for a tiny magnetic sample at low temperature. In this technique, a small magnetization change associated with ESR transition is detected as deflection of a sample-mounted cantilever. So far, we have succeeded in ESR detection at 370 GHz using a commercial piezoresistive microcantilever. The spin sensitivity was estimated to ~10<SUP>12</SUP> spins/gauss. In order to further increase the sensitivity, we adopt a fiber-opticbased detection system using a Fabry-Perot interferometer in place of piezoresistive system. Fabry-Perot cavity is formed between an optical-fiber end and microcantilever surface, and a change in the interference signal, corresponding to the cantilever deflection, is sensitively detected. This system is suitable for low-temperature and high-magnetic-field experiments because of its compact setup and less heat dissipation. In this study, performance of Fabry-Perot interferometer is evaluated, and its application to cantilever-detected ESR measurement is described.
Computational complexity of state number calculation problem of some bounded classes of Petri net
Atsushi OHTA,Yuki FUKAYA,Kohkichi TSUJI 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
This paper studies computational complexity of state number decision problem of Petri net. The problem is to decide whether the number of reachable markings of a Petri net is greater than or equal to a given finite integer. It is shown that the problem is PSPACE complete for bounded Petri nets, NP- hard for acyclic free choice workflow nets and weighted state machines.
Clinical Characteristics of Esophageal Motility Disorders in Patients With Heartburn
( Satsuki Takahashi ),( Tomoaki Matsumura ),( Tatsuya Kaneko ),( Mamoru Tokunaga ),( Hirotaka Oura ),( Tsubasa Ishikawa ),( Ariki Nagashima ),( Wataru Shiratori ),( Naoki Akizue ),( Yuki Ohta ),( Atsu 대한소화기기능성질환·운동학회 2021 Journal of Neurogastroenterology and Motility (JNM Vol.27 No.4
Background/Aims Esophageal motility disorders (EMDs) contribute to the pathophysiology of gastroesophageal reflux disease. However, the causes of EMDs and their impact on gastroesophageal reflux disease-associated symptoms remain unknown. This study aims to elucidate clinical features associated with various types of EMDs in patients with heartburn symptoms. Methods Of the 511 patients who underwent high-resolution manometry, 394 who were evaluated for heartburn symptoms were examined. Patients subjected to high-resolution manometry were classified into 4 groups: outflow obstruction group, hypermotility group, hypomotility group, and normal motility group. Symptoms were evaluated using 3 questionnaires. Patient characteristics and symptoms for each EMD type were compared with those of the normal motility group. Results Of the 394 patients, 193 (48.9%) were diagnosed with EMDs, including 71 with outflow obstruction, 15 with hypermotility, and 107 with hypomotility. The mean dysphagia score was significantly higher in each of the 3 EMD groups compared with those with normal motility. The mean acid reflux and dyspepsia scores were significantly lower in the outflow obstruction group (P < 0.05). The mean body mass index and median Brinkman index were significantly higher in the hypermotility group (P = 0.001 and P = 0.018, respectively), whereas the mean diarrhea and constipation scores were significantly lower in the hypomotility group (P < 0.05). Conclusions The results of our study indicate that different EMDs have distinct characteristics. Cigarette smoking and high body mass index were associated with esophageal hypermotility. Assessment of the dysphagia symptom scores may help identify patients with EMDs. (J Neurogastroenterol Motil 2021;27:545-554)