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Shiro Ikeda,Masafumi Oikawa,Yoshika Sekine 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Bioassay, which detects biohazardous property of environmental contaminants, is still being an unexploredfield of air quality monitoring. This study aims to develop a simple testing system of toxicity of the indoor particulate matter by detecting bioluminescence reduction of marine bacterium Vibrio fischeri. Suspended particulate matter in indoor and outdoor air was collected on a quartz fiber filter at a flow rate of 23.5 L/min. by a low volume air sampler for 7-day duration, at the terrace and living room of an apartment house in Kanagawa, Japan. Collected materials wereextracted with sterilized distilled water by mild shaking. After filtration with 0.45 ??m pore size filter, the extracts were subsequently mixed with a bacterium solution in a well of 24-well plate and time courses of bioluminescence intensity were measured by a luminometer. As a result, the water extracts of indoor and outdoor aerosol samples significantly reduced the bioluminescence of Vibrio fischeri and the inhibition per sampling volume increased with increasing TSPconcentrations. The inhibition per unit mass of the indoor aerosols became greater than that of outdoor aerosols, whenincreasing in air change rate. The inhibition tended to correlate with nitrate and sulfate concentrations in the extracts. This study showed possible application of bioassay to the monitoring of indoor suspended particle contamination.
Shiro Masuda,Kohei Ishigaki 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes a medthod for simultaneous estimation of disturbance and process gain using moving horizon estimation for discrete-time, single-input, single-output, linear time-invariant processes. The strategy for the proposed adaptive disturbance estimator is to minimize a moving-horizon performance index which consist of quadratic forms of estimated output error and disturbances. Furthermore, we propose a recalculation method using two patterns of estimated values of disturbance and process gain for different two input signals. Through a numerical simulation for the approximated process model of an oxygen converter gas recovery process, the efficiency of the proposed method will be shown.
( Shiro Tanaka ),( Shintaro Nohara ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Recent improvements in drilling technology have enabled high-quality core sampling. Furthermore, visualizing the fracture and deformation structures inside cores in three -dimension has become possible using X-ray CT images of the boring cores. In this study, to examine the fracture and deformation conditions in slopes, X-ray CT observations were performed on a boring core collected from the rock slopes with continuous displacement and landslide. The boring core collected from the rock slope displayed continuous displacement changes from deep stable rock to rock with high angle fractures, rock with jigsaw puzzle-like cracks, and brecciated rocks. It was confirmed that the rock fragments are weakly arranged by shear, particularly in the fine-grained zones in the brecciated rocks. Occasionally, above the brecciated zone, nearly unbroken rock masses are distributed with strike and dip values nearly the same as those of the deep stable rock. In the boring core collected from the landslide area, in addition to the main sliding surface, there were several zones in the landslide body in which the bedrock was fine-grained. It was confirmed that the rock fragments in these zones were weakly arranged. Therefore, it was shown using X-ray CT observations of a boring core that the inner features of a landslide body could be clearly shown and that loosening areas with a risk of slope failure could be clearly extracted.
Shiro Miyayama,Masashi Yamashiro,Rie Ikeda,Junichi Matsumoto,Nobuhiko Ogawa,Kazuo Notsumata 소화기인터벤션의학회 2022 Gastrointestinal Intervention Vol.11 No.1
Background: Bleeding from duodenal varices is a rare but life-threatening complication of portal hypertension. The treatment of duodenal varices remains difficult and a definitive treatment strategy has not been established. The aim of this study was to report the technical aspects and outcomes of balloon-occluded retrograde transvenous obliteration (BRTO) using 5% ethanolamine oleate with iopamidol (EOI) for duodenal varices. Methods: Six consecutive patients with duodenal varices treated using BRTO were eligible. Endoscopic treatment was performed first in three patients with active bleeding. After coil embolization of collateral veins, stepwise EOI infusion was performed at intervals of 10–30 minutes under balloon occlusion until the main efferent vein, varices, and the main afferent vein were filled with EOI and clots. The techniques and outcomes of BRTO were retrospectively evaluated. Results: The main efferent vein of duodenal varices was the right (n = 4) or left (n = 2) gonadal vein. In three patients with ruptured varices, BRTO was performed after achieving hemostasis by endoscopic treatment. In five patients, 1–4 (mean, 2.4 ± 1.1) collateral veins were embolized with coils before EOI infusion. Furthermore, 11–21 mL (mean, 15.3 ± 4.2 mL) of EOI was infused by 3–5 (mean, 3.5 ± 1.0) stepwise infusions via the efferent vein under balloon occlusion. The duration of EOI infusion under balloon occlusion ranged from 82 to 118 minutes (mean, 87.8 ± 13.6 minutes). The varices were thrombosed in all but one patient. In the remaining patient, the varices were thrombosed by additional BRTO under overnight balloon occlusion performed 19 days later. The only complications were a transient fever and hematuria. All duodenal varices disappeared during a followup of 4–32 months (mean, 16.2 ± 11.1 months) after BRTO. Conclusion: BRTO using EOI is an effective treatment for duodenal varices.