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Hybrid Microstructure and Mechanical Properties of HRS Processed SUS316L and Titanium Materials
Fujiwara Hiroshi,Ohta Koichi,Noro Atsushi,Ameyama Kei 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
SUS316L stainless steel, commercial pure Titanium and Ti-6Al-4V alloy powders applied by Mechanical Milling (MM) process are sintered by Hot Roll Sintering (HRS) process. Microstructure and mechanical properties of those HRS materials is investigated. The microstructures of materials produced by HRS process consist of fine grains and work-hardened structure, that is, the hybrid microstructure. Tensile test of the HRS material demonstrated the good mechanical properties. These results show that the HRS process is very effective to the improvement of mechanical properties in the SUS316L stainless steel, commercial pure Titanium and Ti-6Al-4V alloy.
( Yasuhiro Fujiwara ),( Masatsugu Okuyama ),( Yasuaki Nagami ),( Koichi Taira ),( Hirotaka Ishizu ),( Osamu Takaishi ),( Hiroshi Sato ),( Toshio Watanabe ) 대한소화기기능성질환·운동학회 2021 Journal of Neurogastroenterology and Motility (JNM Vol.27 No.4
Background/Aims Belching is the act of expelling gas from the stomach or esophagus noisily through the oral cavity. Although it is a physiological phenomenon, belching may also be a symptom of upper gastrointestinal diseases such as reflux esophagitis and functional dyspepsia (FD). A detailed epidemiology of belching has not yet been reported. The aim of this study is to examine the prevalence and clinical characteristics of clinically significant belching (CSB) in adults. Methods We analyzed 1998 subjects who visited the hospital for annual health checkups. Belching was evaluated by a simple question “Do you burp a lot?” and scored as 0 (never), 1 (occasionally), 2 (sometimes), 3 (often), or 4 (always). Subjects with CSB were defined as having scores ≥ 3. We also collected the clinical parameters, endoscopic findings, and data according to the Athens Insomnia Scale, Rome IV questionnaire, and Hospital Anxiety and Depression Scale (HADS). Results Of the 1998 subjects, 121 (6.1%) had CSB. Subjects with CSB had FD more commonly than reflux esophagitis, but presence of heartburn was high (10.7% vs 3.1%). In addition, the HADS and Athens Insomnia Scale scores in subjects with CSB were significantly higher than those in subjects without CSB. Presence of heartburn (OR, 2.07; 95% CI, 1.05-4.09), presence of FD (OR, 2.12; 95% CI, 1.33-3.36), anxiety/depression (OR, 2.29; 95% CI 1.51-3.45), and sleep disturbances (OR, 1.73; 95% CI, 1.14-2.61) were significantly associated with CSB. Conclusion The detailed epidemiology of belching in the general adult population was clarified. (J Neurogastroenterol Motil 2021;27:581-587)
Improvement of a Low Cost MEMS-based GPS/INS, Micro-GAIA
Takeshi Fujiwara,Toshiaki Tsujii,Hiroshi Tomita,Masatoshi Harigae 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.1 No.-
Recently, inertial sensors like gyros and accelerometers have been quite miniaturized by Micro Electro-Mechanical Systems (MEMS) technology. JAXA is developing a MEMS-based GPS/INS hybrid navigation system named Micro-GAIA. The navigation performance of Micro-GAIA was evaluated through off-line analysis by using flight test data. The estimation errors of the roll, pitch, and azimuth were 0.03°, 0.05°, and 0.33° (1ο), respectively. The horizontal position errors after 60-second GPS outages were reduced to 25m CEP. The attitude errors and position errors are nearly half of ones reported previously[2]. Furthermore, using the adaptive Kalman filters, the robustness against the uncertainty of the measurement noise was improved. Comparing the innovation-based and residual-based adaptive Kalman filters, it was confirmed that the latter is robuster than the former.
Satoe Fujiwara,Yoshito Terai,Satoshi Tsunetoh,Hiroshi Sasaki,Masanori Kanemura,Masahide Ohmichi 대한부인종양학회 2015 Journal of Gynecologic Oncology Vol.26 No.4
Objective: There is no research regarding the appropriate antiemetic agents for female patients, especially those receiving moderately emetogenic chemotherapy (MEC). We evaluated the antiemetic efficacy of a combination of 5-HT3 receptor with/ without aprepitant in patients with gynecological cancer treated with the TC (paclitaxel and carboplatin) regimen of MEC. Methods: We enrolled 38 patients diagnosed with gynecologic cancer and scheduled to receive the TC regimen. The patients were randomly assigned to receive a 5-HT3 receptor antagonist, either palonosetron in the first cycle followed by granisetron in the second cycle or vice versa. In the third cycle, all patients received a combination of the 5-HT3 receptor and dexamethasone with/without aprepitant. Results: When three drugs were administered, palonosetron consistently produced an equivalent complete response (CR) rate to granisetron in the acute phase (89.5% vs. 86.8%, p=0.87) and delayed phase (60.5% vs. 65.8%, p=0.79). With regard to the change in dietary intake, palonosetron exhibited similar efficacy to granisetron in the acute phase (92.1% vs. 89.4%, p=0.19) and delayed phase (65.7% vs. 68.4%, p=0.14). However, in the delayed phase, the addition of aprepitant therapy with a 5-HT3 receptor antagonist and dexamethasone produced a higher CR rate than a 5-HT3 receptor antagonist with dexamethasone (93.3% vs. 47.8%, p<0.001) and allowed the patients to maintain a higher level of dietary intake (93.3% vs. 56.5%, p<0.001). Conclusion: The addition of aprepitant therapy was more effective than the control therapy of a 5-HT3 receptor antagonist, and dexamethasone in gynecological cancer patients treated with the TC regimen.
Research on The Virtual Space System Used for Learning of Autonomous Robots
Hirotsugu Yano,Hiroshi Douzono,Ryouhei Fujiwara 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Recently, the applications of the virtual space become more popular. In some cases, the experiments in real space require huge time and huge costs. For such cases, experiments in the virtual space are applied. We have developed virtual space system for learning of autonomous robot controlled with visual information in OpenGL space. The purpose of this study is to develop the more realistic virtual space which can compensate the difference between real space and virtual space. For this purpose, we introduced the texture mapping to the object in virtual space and the additional virtual sensors which can use for controlling the robot. We made some experiments of autonomous robots controlled by SOM-RL algorithm and examine the effectiveness of proposed system.
Domains of the Kihon Checklist Associated with Prefrailty among Community-Dwelling Older Adults
Taishiro Kamasaki,Hiroshi Otao,Mizuki Hachiya,Atsuko Kubo,Hiroyuki Okawa,Kazuhiko Fujiwara,Asuka Sakamoto,Suguru Shimokihara,Michio Maruta,Gwanghee Han,Takayuki Tabira 대한노인병학회 2023 Annals of geriatric medicine and research Vol.27 No.2
Background: Various functions are involved in prefrailty. However, no studies have examined more relevant functions. Therefore, this study examined the domains of the Kihon Checklist (KCL) associated with prefrailty by comparing them to robustness measures, using the KCL to comprehensively assess life-related functions in community-dwelling older adults.Methods: The 194 (mean age, 75±6 years) participants were community-dwelling older adults. Their robustness and preferences were assessed using the Japanese Cardiovascular Health Study criteria. Comprehensive life-related functions were assessed using the KCL, and each physical function was measured.Results: The main KCL characteristics associated with robustness and prefrailty were physical function (odds ratio [OR]=1.83; 95% confidence interval [CI], 1.17–2.88), nutritional status (OR=8.16; 95% CI, 2.96–22.48), and depressed mood (OR=3.46; 95% CI, 1.76–6.79). In particular, older adults had difficulty moving, including climbing stairs and getting up from a chair, which suggested a strong fear of falling. The participants also reported psychological characteristics such as low life fulfillment, a low sense of self-usefulness, and a strong sense of boredom.Conclusions: Prefrail individuals were characterized by poor physical function and nutritional status, as well as depressive mood. Prefrailty may be prevented or improved by approaches to improve physical function and fear of falling in addition to psychological interventions that encourage activity and a sense of self-usefulness.
Disorder in the Cubic Phase of PbHfO3 by High Energy Synchrotron Radiation Diffraction
Yoshihiro Kuroiwa,Akikatsu Sawada,Hiroshi Fujiwara,Hitoshi Kawaji,Tooru Atake 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
The electron charge density distributions of PbHfO3 in the cubic phase have been investigated in association with the antiferroelectric phase transition, by analyzing high-energy synchrotronradiation powder diraction data by the maximum entropy method (MEM)/Rietveld method. The Pb atom is found to be ionic and disordered in the h100i direction. Clear covalency is observed on the Hf-O bonding. The charge density distributions around the O atom are extremely anisotropic, and are extended in the directions perpendicular to the Hf-O covalent bond. These structural characteristics are observed both at 500 K near Tc (= 476 K) and at 700 K far above Tc.