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Mechanical Thrombectomy for Large Vessel Occlusion via the Transbrachial Approach: Case Series
Tsuji Yuichiro,Miki Takanori,Kakita Hiroto,Sato Kimitoshi,Yoshida Takashi,Shimizu Fuminori 대한신경중재치료의학회 2020 Neurointervention Vol.15 No.2
Mechanical thrombectomy has become a standard treatment for acute ischemic stroke with large vessel occlusion. In aged patients, it is difficult to guide the catheter via the transfemoral approach due to vessel tortuosity and aortic elongation. We report our preliminary clinical experience using the transbrachial approach. Among the 119 patients who underwent thrombectomy from April 2018 to December 2019, a total of 5 patients were treated via the transbrachial approach. Clinical outcomes were retrospectively analyzed. Successful reperfusion was achieved in 4 out of 5 cases. There was 1 death due to symptomatic intracranial hemorrhage. One patient had a good outcome at discharge. There were no access-site complications associated with any of these cases. Transbrachial access for mechanical thrombectomy is feasible and can provide an alternative to the transfemoral approach.
Two Externalities in Auto Transport
Masashi Yamamoto,Yuichiro Yoshida 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.11
Facing the rise of environmental concern drivers on the road are now opting to own a more environmentally-friendly cars This paper introduces a new type of user heterogeneity to a classic two-mode problem;drivers are different in terms of the fuel efficiency of the cars they drive. This paper introduces a new perspective to the classic two-mode problem by adding using user heterogeneity in terms of fuel efficiency of the cars they drive. In the case of the first best, it is confirmed that the anonymity principle still applies in a way that the toll should be the same between these two groups of drivers, equaling to the marginal external costs. Following the first best analysis, the paper investigats the second-best with unpriced city streets. It is shown that the price of a highway trip is now different from its social marginal cost, and that the direction of this deviation from the social marginal cost is opposite depending on the type of the car.
Efficiency and stability of an open sky network
Katsuhiro Yamaguchi,Masashi Yamamoto,Yuichiro Yoshida 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.8
North America, Europe, and Asia are three largest regional blocks in the global aviation. EU has liberalized its aviation market within the region, following the north America. However, Asia is still left behind, and most of the markets in the region are still governed by bilateral air service agreements. This paper shows that, any pair of countries with an exclusive bilateral air-service agreement has no incentive to open their market to the third country; and yet that a comprehensive multilateral air service agreement within the entire region improves the welfare of all countries in the region.
Liu, Shuli,Wan, Yulai,Ha, Hun-Koo,Yoshida, Yuichiro,Zhang, Anming Elsevier 2019 Transportation research Part A, Policy and practic Vol.127 No.-
<P><B>Abstract</B></P> <P>We explore the impacts of high-speed rail (HSR) development on airport-level traffic by considering not only the availability of air-HSR intermodal linkage between the airport and HSR station but also the position of the airport’s city in the HSR network. The latter is measured by both the degree centrality (to reflect connectivity) and the harmonic centrality (to reflect accessibility). Using a sample of 46 airports in China and a sample of 16 airports in Japan over the period of 2007–2015, we conduct regression analysis and compare the effects of HSR network development on airports in these two Northeast Asian countries. We find that as HSR connectivity or accessibility increases, there is, on average, a decline in airports’ domestic and total traffic in China but little change in Japan. Meanwhile, we observe a strong complementary effect of HSR to feed international flights with the presence of air-HSR intermodal linkage. As a result, some airports may experience a total traffic increase. In China, hub airports tend to gain traffic regardless the availability of air-HSR linkage, while non-hub airports are likely to lose. In Japan, on the other hand, airports with air-HSR linkage tend to gain traffic regardless the hub status. Our analysis also reveals some differentiated impacts of HSR connectivity and accessibility in China. An important policy implication is that the investment in air-HSR intermodal linkage at busy airports may not help with realizing the benefit of congestion mitigation and emission reduction. Rather, policy makers may invest air-HSR linkage at regional airports which have the potential to be converted into international gateway hubs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A network view of HSR development is taken to study its impact on airport traffic. </LI> <LI> HSR connectivity and accessibility affect airport traffic differently. </LI> <LI> Airport-HSR station linkage and airport hub status play substantial roles. </LI> <LI> On average the impacts in China are stronger than in Japan, especially in domestic markets. </LI> <LI> HSR development tends to make airport traffic more concentrated to large hubs in China. </LI> </UL> </P>
Efficiency Measurement Theory and its Application to Airport Benchmarking
Tae Hoon Oum,Katsuhiro Yamaguchi,Yuichiro Yoshida 인하대학교 정석물류통상연구원 2008 인하대학교 정석물류통상연구원 학술대회 Vol.2008 No.4
Efficiency measurement is critical for industries where firms do not face strong com-petition, as we cannot rely on the market to discipline the firms effectively. Airports are a typical example. At the same time, the fact that airports produces multiple outputs using a common set of inputs calls for a delicate and sophisticated treatment in measuring their efficiencies. The current paper starts out by presenting the conventional methodologies of efficiency measurement such as DEA, Stochastic Frontier method, Productivity Index, and some recent developments in efficiency measurement literature. We then provide a review of the existing literature on the results of airport efficiency measurement, recent advancement on the airport efficiency measurement, and some recent empirical estimates of the effects of ownership forms and governance structures on airport’s efficiency.
Tsukasa Kanchiku,Yasuaki Imajo,Hidenori Suzuki,Yuichiro Yoshida,Toshihiko Taguchi,Toshikatsu Tominaga,Koichiro Toyoda 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.4
Study Design: Multicenter prospective study with a crossover design. Purpose: The objective of this study is to compare the efficacy of limaprost alfadex (LP) and elcatonin (EL) for lumbar spinal stenosis (LSS) patients with concurrent osteoporosis. Overview of Literature: It has been increasingly important to improve quality of life by establishing appropriate conservative treatments for LSS patients with concurrent osteoporosis who will presumably continue to increase due to the percentage of the aging elevations, however there is no prospective study. Methods: A total of 19 patients with LSS and concurrent osteoporosis were enrolled in this study. The patients were divided into two groups and compared using a crossover design. The Japanese Orthopaedic Association Back Pain Evaluation Questionnaire (JOABPEQ) and short-form (SF)-8 health survey scale were used for clinical evaluations. Results: There was a significant improvement of buttock-leg pain and numbness in the EL group. A significant improvement of impaired walking function was noted for the LP group according to the JOABPEQ while the rest of the items in the JOABPEQ showed no significant differences. The SF-8 health survey revealed that somatic pains and physical summary scores in the EL group and physical functioning and physical summary scores in the LP group tended to improve but not to any statistically significant extents. Conclusions: Concomitant uses of EL may be useful in patients who do not respond satisfactorily to the treatments of LP for 6–8 weeks.
Normal Values of Diffusion Tensor Magnetic Resonance Imaging Parameters in the Cervical Spinal Cord
Kazuki Chagawa,Shunka Nishijima,Tsukasa Kanchiku,Yasuaki Imajo,Hidenori Suzuki,Yuichiro Yoshida,Toshihiko Taguchi 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.4
Study Design: Prospective study. Purpose: We evaluated the usefulness of diffusion tensor imaging (DTI) in diagnosing patients with cervical myelopathy by determining the accuracy of normal DTI parameter values. Overview of Literature: DTI can visualize white matter tracts in vivo and quantify anisotropy. DTI is known to be more sensitive than conventional magnetic resonance imaging (MRI) in detecting subtle pathological changes of the spinal cord. Methods: A total of 31 normal subjects (13 men and 18 women; age, 23–87 years; mean age, 46.0 years) were included in this study. The patients had no symptoms of myelopathy or radiculopathy. A Philips Achieva 3-Tesla MRI with SE-type Single Shot EPI was used to obtain diffusion tensor images. Apparent diffusion coefficient (ADC) and fractional anisotropy (FA) values were measured as DTI parameters on axial sections of several cervical levels. Subjects were divided into two groups: >40 years (n=16) and ≤40 years (n=15). A paired t-test was used to compare significant differences between the groups. ADC and FA values were most stable on axial sections. Results: For all subjects, mean ADC and FA values were 1.06±0.09×10−3 mm2/sec and 0.68±0.05, respectively. ADC was significantly higher in subjects >40 years of age than in those ≤40 years. There was no significant difference in FA values between the two groups. The mean ADC value was significantly higher in normal subjects >40 years of age than in those ≤40 years. Conclusions: It is important to consider age when evaluating cervical myelopathy by DTI.