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Ryuji Michino,Ikuro Mizumoto 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper presents a design method of adaptive output feedback controller for nonlinear systems with higher order relative degree and some uncertainties in control input term. The controlled system has a relative degree of one from the virtual filter signals as a control input to the controlled system output by introducing two virtual filters. The actual control input is designed for the virtual filter output signals to be a high gain adaptive output feedback control through backstepping in the filter dynamics. The proposed method is useful in the case where only the output signal is available.
Ryuji Sugiura,Tatsuo Fujikawa,Rie Nishikata,Tetsuya Nishimoto 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
To obtain information on the mechanical tolerance of soft tissue bruise injury caused by dynamic contact between human body parts and a robot, impact tests were conducted using anesthetized live pigs. A falling-weight impact tester was used to conduct tests on the chest and extremities by varying the mass and dropping height of the impactor. The subcutaneous tissues of the impacted parts were sampled, and internal bleeding, as a sign of bruising, was pathologically observed. The minimum value of transferred energy per unit area, categorized as a mechanical tolerance value for bruising, was found to be significantly smaller in the extremities as compared to the chest owing to structural differences between the two parts. These structural differences should be carefully considered for safe robot designs.
Factors promoting and impeding precautionary evacuation behaviour
Ryuji Kakimoto,Toshio Fujimi,Mamoru Yoshida,Hwayoung Kim 서울시립대학교 도시과학연구원 2016 도시과학국제저널 Vol.20 No.2
In July 2012, 23 people in Aso area, Japan died as the result of a landslide; subsequently, 36 people on Izu Island and 74 people in Hiroshima city died after landslides in October 2013 and August 2014, respectively. In all three instances, localized torrential raining occurred in the late evening and all three local governments were hesitant to issue the recommended evacuation warning for the predicted heavy rains in each locality. These unfortunate disasters led the Kumamoto Prefecture to introduce a precautionary evacuation to Aso city and Minamiaso village, but the participation rate of precautionary evacuation has been very low. This study aims to find the factors that promote and impede precautionary evacuation behaviour. We effectuate the covariance structure analysis of preventive evacuation behaviour based on protection motivation theory. We find that the main cause promoting precautionary evacuation behaviour was fear of the natural disaster. The factors impeding precautionary evacuation behaviour were predominantly psychological aspects such as the annoyance and hassle of moving to a shelter or staying at a shelter with others.
A POWER CONSUMPTION ANALYSIS OF GENERAL-PURPOSE BLUETOOTH WIRELESS COMMNICATION MODULES
Ryuji TANAKA,Koichiro TANAKA 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper reports the measurement results of the operating current and the throughput for Bluetooth wireless communication modules. Recently, various wireless communication equipments that operate at 2.4 ㎓ frequency are used. Especially, Bluetooth, which operates at 2.4 ㎓ frequency, is installed for mobile devices such as mobile phones and music players, and can be expected to be used widely in the future. To use Bluetooth wireless communications capability on the equipment without those capability, ZEAL series which is general-purpose Bluetooth wireless communication modules released by ADC Technology. In ZEAL, there are two types of modules with the differences of Bluetooth classes. One is Bluetooth class 1 ZEAL-S01 that allows communicating over the 100m range. The other is Bluetooth class 2 ZEAL-C01 that allows communicating over the 10m range. In addition, there are three power levels of low-power level, standard level, and hi-speed level in ZEAL-C01 with firmware version 2.0.2.1. Then, to investigate power consumption and the throughput in each power levels in ZEAL-C01, those operation current and the throughput is measured for ten of baud rates that are from 2,400 bps to 921,600 bps. As a result, the supply current of all modules doesn’t depend on the baud rate. As a result, we have obtained the result that range of throughput that can be used to communicate actually in ZEAL-C01 at each levels.
Cut-off value of D-dimer for prediction of deep venous thrombosis before treatment in ovarian cancer
Ryuji Kawaguchi,Naoto Furukawa,Hiroshi Kobayashi 대한부인종양학회 2012 Journal of Gynecologic Oncology Vol.23 No.2
Objective: The purpose of the present study was to elucidate the incidence of deep venous thrombosis (DVT) before treatment in ovarian cancer and the appropriate cut-off value of D-dimer (DD) for the diagnosis of DVT. Methods: Between July 2007 and October 2008, eighty seven patients with presumed ovarian cancer (final diagnosis: ovarian cancer, n=59; borderline malignancy, n=28) were enrolled. Measurement of DD levels and subsequent venous ultrasonography were performed before treatment. Results: The mean DD level was 4.1 μg/mL. Subsequent venous ultrasonography revealed DVT in 14 of 87 (16.1%) patients (ovarian cancer, 12 cases; borderline malignancy, 2 cases). None were found to have developed DVT if they had a DD level of <1.5 μg/mL. If 1.5 μg/mL was used as a cut-off value for DD levels to diagnose DVT, sensitivity, specificity, positive predictive value, and negative predictive value were 100%, 61.6%, 33.3%, and 100%. There was noclinical onset of postoperative pulmonary thromboembolism. Conclusion: Our data suggest that presumed ovarian cancer patients with at least more than 1.5 μg/mL should be examined using venous ultrasonogaphy to detect DVT. Objective: The purpose of the present study was to elucidate the incidence of deep venous thrombosis (DVT) before treatment in ovarian cancer and the appropriate cut-off value of D-dimer (DD) for the diagnosis of DVT. Methods: Between July 2007 and October 2008, eighty seven patients with presumed ovarian cancer (final diagnosis: ovarian cancer, n=59; borderline malignancy, n=28) were enrolled. Measurement of DD levels and subsequent venous ultrasonography were performed before treatment. Results: The mean DD level was 4.1 μg/mL. Subsequent venous ultrasonography revealed DVT in 14 of 87 (16.1%) patients (ovarian cancer, 12 cases; borderline malignancy, 2 cases). None were found to have developed DVT if they had a DD level of <1.5 μg/mL. If 1.5 μg/mL was used as a cut-off value for DD levels to diagnose DVT, sensitivity, specificity, positive predictive value, and negative predictive value were 100%, 61.6%, 33.3%, and 100%. There was noclinical onset of postoperative pulmonary thromboembolism. Conclusion: Our data suggest that presumed ovarian cancer patients with at least more than 1.5 μg/mL should be examined using venous ultrasonogaphy to detect DVT.
( Ryuji Kawaguchi ),( Shoji Haruta ),( Hiroshi Kobayashi ) 대한산부인과학회 2017 Obstetrics & Gynecology Science Vol.60 No.6
Objective Cesarean section is associated with an increased risk for venous thromboembolism (VTE). The safety and efficacy of primary prophylaxis of fondaparinux, a synthetic sulfated pentasaccharide heparin analog, in women at risk after cesarean section is uncertain. Methods This was a retrospective study of 295 cases of pregnant women presenting to a tertiary referral center of Nara, Japan, to evaluate the usefulness of thromboprophylaxis with fondaparinux after cesarean delivery between 2011 and 2012. Patients were initially received unfractionated heparin (once 5,000 IU subcutaneously, twice a day), starting 6 hours after cesarean section for 24 hours, and then treated with fondaparinux (once 2.5 mg daily, subcutaneously) for 5 days. The primary efficacy end-point was an improvement in the incidence of symptomatic VTE or fatal post-cesarean pulmonary thromboembolism. The primary safety end-point was major bleeding during treatment. Results There were neither any episodes of symptomatic VTE cases nor maternal deaths. A total of 10 patients had a bleeding event. Major bleeding complication was observed in 2 (0.68%) of 295 patients receiving fondaparinux. Non-major bleeding into critical sites was observed in 8 patients, often at surgical sites, and recovery was not delayed. Conclusion This study demonstrates the safety and efficacy of fondaparinux in women at high risk of VTE after cesarean section. Large phase trials comparing clinical outcomes with fondaparinux across a wide spectrum of patients are needed to confirm these observations.