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Sakisuka Ryo,Morita Takumi,Tanaka Yuya,Hori Shinya,Shimo Daisuke,Hashimura Naoki,Kuroyama Takahiro,Ueno Yasushi 대한신경중재치료의학회 2024 Neurointervention Vol.19 No.1
Vertebral artery stump syndrome (VASS) is a rare condition that can cause posterior circulation ischemic stroke due to occlusion of the ipsilateral vertebral artery (VA) orifice, resulting in blood flow stagnation and embolus formation. Although there is no established treatment for this condition, we observed 3 cases of VASS out of 326 acute ischemic stroke cases at a single institution from April 2021 to October 2022. Despite the best possible antithrombotic treatment, all 3 patients had recurrent ischemic strokes. One patient underwent drug-eluting stenting of the VA orifice to relieve occlusive flow. The other 2 patients received coil embolization, which resulted in the disappearance of their culprit collateral flow. None of the patients had recurrent ischemic strokes after endovascular intervention. Based on our observations, stenting and coil embolization are effective methods for preventing future recurrences of VASS.
Redundant Control of a Planar Snake Robot with Prismatic Joints
Motoyasu Tanaka,Hidemasa Sawabe,Mizuki Nakajima,Ryo Ariizumi 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.10
This paper presents a control method of a planar snake robot with prismatic joints. The kinematic model is derived considering velocity constraints caused by passive wheels. The proposed control method based on the model allows the robot to track a target trajectory by appropriately changing its link length using prismatic joints. The degrees of freedom of prismatic joints are represented as kinematic redundancy in the model and are used inrealizing subtasks such as singularity avoidance and obstacle avoidance. In addition, the link length is below its limit when introducing a sigmoid function into the kinematic model. Simulations are carried out to demonstrate the effectiveness of the proposed method and show a novel motion that avoids singular configurations through changes in link lengths.
Effect of deflected inflow on flows in a stronglycurved 90 degree elbow
Yukiharu Iwamoto,Ryo Kusuzaki,Motosuke Sogo,Kazunori Yasuda,Hidemasa Yamano,Masaaki Tanaka 한국유체기계학회 2017 International journal of fluid machinery and syste Vol.10 No.1
Wall pressure measurements and flow visualization were conducted for a 90 degree elbow with an axis curvature radius the same as its inner diameter (125 mm). Reynolds numbers 320,000 and 500,000, based on the inner diameter and bulk velocity, were examined. A deflected inflow, having an almost constant velocity slope and a faster velocity at the inside, was introduced. Ensemble averaged pressure distributions showed that no difference of normalized pressure could be found in both the Reynolds number cases. Power spectral density functions of pressures exhibited that the fluctuation having the Strouhal number (based on the inner diameter and bulk velocity) of 0.6 existed in the downstream region of the elbow, which was 0.1 larger than that of the uniform inflow case [1]. Results of numerical calculations qualitatively coincided with the experimental ones.
Two Step Framework to Extend Workflow Nets and Soundizability Problem
Shingo Yamaguchi,Ryo Ikeda,Minoru Tanaka 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
We discuss in this paper whether we can extend work-flow nets (WF-nets for short) under the condition to preserve behavioral inheritance and soundness. We propose a two step framework to extend WF-nets, i.e. we first extend a given WF-net under the condition to preserve only behavioral inheritance, and then correct it to be sound if necessary. We tackle a problem of deciding whether we can correct an unsound WF-net to be sound under the condition to preserve behavioral inheritance, named soundizability problem. There are two kinds of behavioral inheritance: Projection inheritance and protocol inheritance. Our results show that if an acyclic free choice WF-net is extended under the condition to preserve projection inheritance, the extended WF-net is sound; If an acyclic free choice WF-net is extended under the condition to preserve protocol inheritance, the extended WF-net may be unsound; The unsound extended WF-net cannot be corrected to be sound under the condition to preserve projection inheritance, but may be corrected under the condition to preserve protocol inheritance.
Keiji Yokoyama,Ryo Yamauchi,Kumiko Shibata,Hiromi Fukuda,Hideo Kunimoto,Kazuhide Takata,Takashi Tanaka,Shinjiro Inomata,Daisuke Morihara,Yasuaki Takeyama,Satoshi Shakado,Shotaro Sakisaka 대한간학회 2019 Clinical and Molecular Hepatology(대한간학회지) Vol.25 No.2
Background/Aims: There is a controversy about the availability of invasive treatment for esophageal/gastric varices in patients with Child-Pugh class C (CP-C) end-stage liver cirrhosis (LC). We have evaluated the validity of invasive treatment with CP-C end-stage LC patients. Methods: The study enrolled 51 patients with CP-C end-stage LC who had undergone invasive treatment. The treatment modalities included endoscopic variceal ligation in 22 patients, endoscopic injection sclerotherapy in 17 patients, and balloon-occluded retrograde transvenous obliteration (BRTO) in 12 patients. We have investigated the overall survival (OS) rates and risk factors that contributed to death within one year after treatment. Results: The OS rate in all patients at one, three, and five years was 72.6%, 30.2%, and 15.1%, respectively. The OS rate in patients who received endoscopic treatment and the BRTO group at one, three, and five years was 67.6%, 28.2% and 14.1% and 90.0%, 36.0% and 18.0%, respectively. The average of Child-Pugh scores (CPS) from before treatment to one month after variceal treatment significantly improved from 10.53 to 10.02 (P=0.003). Three significant factors that contributed to death within one year after treatment included the presence of bleeding varices, high CPS (≥11), and high serum total bilirubin levels (≥4.0 mg/dL). Conclusions: The study demonstrated that patients with a CPS of up to 10 and less than 4.0 mg/dL of serum total bilirubin levels may not have a negative impact on prognosis after invasive treatment for esophageal/gastric varices despite their CP-C end-stage LC.
Sliding Mode Control based on a Modified Linear Control Input
Takehito Fujio,Hiroki Shibasaki,Ryo Tanaka,Takahiro Murakami,Yoshihisa Ishida 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.1
In this study, we explain and demonstrate a design method of sliding mode control based on a modifiedlinear control input. In the proposed method, the optimal gain matrix is derived such that it does not depend onthe plant parameters. We confirmed the robustness of the proposed method by applying input-side disturbancesand plant parameter deviations to plants and the effectiveness of the proposed method by performing a DC motorposition control experiment.
Yuta Uchiyama,Yushi Tanaka,Hikaru Matsuoka,Ryo Kohsaka 한국식품연구원 2017 Journal of Ethnic Foods Vol.4 No.2
Background: To reveal the level of recognition of regional and product certifications related to agriculture, an analysis of the official minutes of assemblies and the perceptions of tourists was conducted. This is one of the first attempts to combine analysis of residents and tourists at the product level (Geographical Indications, trademarks) and landscape level (registration under Food and Agricultural Organization [FAO] or United Nations Educational, Scientific and Cultural Organization [UNESCO]-related certification systems). Methods: The research sites were Itoigawa and Sado, two municipalities in Niigata prefecture. The former is certified as a Global Geopark, and the latter as a National Geopark and Globally Important Agricultural Heritage System (GIAHS). The text-mining approach was conducted to analyze the official minutes of the municipal assemblies, and the questionnaire survey was conducted to identify the recognition of tourists on the certifications. Results: The results of the analysis of assemblies and tourists provide issues and possibilities of the certification systems. Tourists' recognition of the GIAHS and its weighting in the assemblies are relatively low. Residents and tourists have different expectations for regional certification. Residents expect education, while tourists expect tourism. Conclusion: It is necessary to evaluate the GIAHS's contribution to tourism and industry when municipalities and international organizations manage the GIAHS sites. Considering the gaps between residents and tourists and taking measures to resolve them can contribute to managing certificated areas by collaboration of stakeholders. Regarding products aimed at branding, consumers need to be informed about the GIAHS as a regional certification in addition to product certification to share the historical and environmental characteristics of agricultural products.
Yoshiaki Oda,Tomoyuki Takigawa,Ryo Ugawa,Yasuyuki Shiozaki,Haruo Misawa,Yoshihisa Sugimoto,Masato Tanaka,Toshifumi Ozaki 대한척추외과학회 2018 Asian Spine Journal Vol.12 No.2
Study Design: Cross sectional study. Purpose: To clarify the difference in position of the psoas muscle between adult spinal deformity (ASD) and lumbar spinal stenosis (LSS). Overview of Literature: Although it is known that the psoas major muscle deviates in ASD patients, no report is available regarding the difference in comparison with LSS patients. Methods: This study investigates 39 patients. For evaluating spinal alignment, pelvic tilt (PT), pelvic incidence (PI), sacral slope, lumbar lordosis (LL), PI–LL, Cobb angle, and the convex side, the lumbar curves were measured. For measuring the position of the psoas major at the L4/5 disk level, magnetic resonance imaging was used. The displacements of psoas major muscle were measured separately in the anterior–posterior and lateral directions. We examined the relationship between the radiographic parameters and anterior displacement (AD) and lateral displacement (LD) of the psoas major muscle. Results: AD was demonstrated in 15 cases with ASD and nine cases with LSS (p >0.05). LD was observed in 13 cases with ASD and no cases with LSS (p <0.01). The Cobb angle was significantly greater in cases with AD than in those without AD (p =0.04). PT, LL, PI– LL, and Cobb angle were significantly greater in cases with LD (p <0.05). All cases with LD had AD, but no case without AD had LD (p <0.001). The side of greater displacement at L4/5 and the convex side of the lumbar curve were consistent in all cases. Conclusions: Despite AD being observed in LSS as well, LD was observed only in the ASD group. Radiographic parameters were worse when LD was seen, rather than AD.