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Akihiro Hashimoto,Shinkyu Jeong,Shigeru Obayashi 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11
고익기의 대한 공력최적설계를 전산유체역학과 크리킹 근사모델을 기반으로 한 유전알고리즘을 이용하여 실시하였다. 페어링을 포함한 동체의 상부형상을 최적화하여 양력계수를 최대화, 항력계수를 최소화하였다. 최적화된 형상은 Area rule 에 따라 동체를 중앙부가 축소되고 양력을 발생시키기위해 부풀어진 페어링을 가지고 형태를 띠고 있다. 결과적으로 DLR-F6 의 저익기 형상보다 높은 양항비를 보여주었다. 이로부터 저익기보다 뛰어난 공력성능을 지닌 고익기의 설계가 가능을 확인하였다. The aerodynamic shape optimization for a high-wing aircraft is conducted by computational fluid dynamics simulation and the Kriging-surrogate-assisted genetic algorithm. The upper shape of the fuselage including the fairing is optimized to maximize the lift coefficient and minimize the drag coefficient. The optimized configuration achieves higher lift-to-drag ratio than the low-wing DLR-F6 configuration because the fuselage shape follows the area rule for drag reduction while an inflated fairing shape is employed to generate lift. It suggests the possibility of a high-wing aircraft with improved aerodynamic performance compared to a low-wing aircraft.
An Open Study of Sulforaphane-rich Broccoli Sprout Extract in Patients with Schizophrenia
Akihiro Shiina,Nobuhisa Kanahara,Tsuyoshi Sasaki,Yasunori Oda,Tasuku Hashimoto,Tadashi Hasegawa,Taisuke Yoshida,Masaomi Iyo,갠지하시모토 대한정신약물학회 2015 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.13 No.1
Objective: Schizophrenia is a mental disorder characterized by severe cognitive impairment. Accumulating evidence suggests a role for oxidative stress in the pathophysiology of schizophrenia. Sulforaphane (SFN) extracted from broccoli sprout is an agent with potent anti-oxidant and anti-inflammatory activity. In this study, we attempted to evaluate the effect of SFN on cognitive impairment in medicated patients with schizophrenia. Methods: We recruited a total of 10 outpatients with schizophrenia, all of whom gave informed consent. Participants took 3 tablets of SFN, consisting of 30 mg of SFN-glucosinolate per day, for 8 weeks. Clinical symptoms using the Positive and Negative Syndrome Scale (PANSS) and cognitive function using the Japanese version of CogState battery were evaluated at the beginning of the study and at week 8. Results: A total of 7 patients completed the trial. The mean score in the Accuracy component of the One Card Learning Task increased significantly after the trial. However, we detected no other significant changes in participants. Conclusion: This result suggests that SFN has the potential to improve cognitive function in patients with schizophrenia.
Koichi Inukai,Akihiro Usui,Yu Hashimoto,Fumitaka Kato,Koji Amano,Hiroyuki Kayata,Nobutaka Mukai,Naoki Shinyama 대한외상중환자외과학회 2022 Journal of Acute Care Surgery Vol.12 No.3
Purpose Despite widespread adoption of open abdominal management (OAM), there is currently no threshold criterion for OAM duration for non-trauma patients. Moreover, there is a positive relationship between morbidity and the duration of OAM, but an uncertain relationship with patients’ age. Therefore, a novel clinical index for the duration of open abdominal management (IDOM) was developed based on the patient’s age and risk of severe complications following OAM to indicate the maximum tolerable number of days of OAM based on the individual’s age. The utility of this new index was evaluated. Methods This retrospective study included 65 non-trauma patients managed with an open abdomen (OA) from August 2015 to August 2018. The IDOM was developed based on the patient’s age. The result indicated the maximum number of OA days. Patients’ demographic and operative variables were examined and patient data was assigned to one of two groups according to whether the actual number of OA days was above or below the calculated IDOM. Prevalence of complications between these groups was compared. Measures of validity were employed to assess the utility of the IDOM for patient complications. Results Sixty-five patients were included. The above-the calculated IDOM group exhibited a significantly longer OA and higher rates of wound complications and postoperative respiratory complications compared with the below the calculated IDOM group. The IDOM predicted the incidence of OA-related complications with a sensitivity of 72.4%, and a specificity of 80.6%. Conclusion The IDOM is a potentially useful tool for appropriate duration at the outset of OA.
Development of a WLAN Based Monitoring System for Group Activity Measurement in Real-Time
Tsunoda, Hiroshi,Nakayama, Hidehisa,Ohta, Kohei,Suzuki, Akihiro,Nishiyama, Hiroki,Nagatomi, Ryoichi,Hashimoto, Kazuo,Waizumi, Yuji,Keeni, Glenn Mansfield,Nemoto, Yoshiaki The Korea Institute of Information and Commucation 2011 Journal of communications and networks Vol.13 No.2
In recent years, there has been a rise in epidemiological evidence suggesting the health benefits of a physically active lifestyle. However, it is not always easy for individuals to personally recognize the optimal conditions for exercise and physical activity. Wearable acceleration-based pedometers have become widely used in estimating the amount of physical activity, and to a limited extent, providing information regarding exercise intensity, but they have never been used to assess adaptation to exercise. In order to realize simultaneous activity monitoring for multiple users exercising outdoors, we developed a prototype wireless local area network (WLAN) based system. In our system, a WLAN is deployed outside, and a user wearing a smart phone and monitoring device exercises freely within the coverage area of the wireless network. By doing so, the developed system is able to monitor the activity of each user andmeasures various parameters including those related to exercise adaptation. In a demonstration experiment, the developed system was evaluated and used to monitor users enjoying a Nordic walk, after which users were immediately able to receive their exercise report. In this paper, we discuss the requirements and issues in developing an activity monitoring system and report the findings we obtained through the demonstration experiment.
Development of a WLAN Based Monitoring System for Group Activity Measurement in Real-Time
Hiroshi Tsunoda,Hidehisa Nakayama,Kohei Ohta,Akihiro Suzuki,Hiroki Nishiyama,Ryoichi Nagatomi,Kazuo Hashimoto,Yuji Waizumi,Glenn Mansfield Keeni,Yoshiaki Nemoto 한국통신학회 2011 Journal of communications and networks Vol.13 No.2
In recent years, there has been a rise in epidemiological evidence suggesting the health benefits of a physically active lifestyle. However, it is not always easy for individuals to personally recognize the optimal conditions for exercise and physical activity. Wearable acceleration-based pedometers have become widely used in estimating the amount of physical activity, and to a limited extent,providing information regarding exercise intensity, but they have never been used to assess adaptation to exercise. In order to realize simultaneous activity monitoring for multiple users exercising outdoors, we developed a prototype wireless local area network (WLAN) based system. In our system, a WLAN is deployed outside, and a user wearing a smart phone and monitoring device exercises freely within the coverage area of the wireless network. By doing so, the developed system is able to monitor the activity of each user andmeasures various parameters including those related to exercise adaptation. In a demonstration experiment, the developed system was evaluated and used to monitor users enjoying a Nordic walk, after which users were immediately able to receive their exercise report. In this paper, we discuss the requirements and issues in developing an activity monitoring system and report the findings we obtained through the demonstration experiment.
Interlayer vacancy effects on the phonon modes in AB stacked bilayer graphene nanoribbon
Khalid N. Anindya,Md Sherajul Islam,박정원,Ashraful G. Bhuiyan,Akihiro Hashimoto 한국물리학회 2020 Current Applied Physics Vol.20 No.4
We explore the effects of interlayer vacancy defects on the vibrational properties of Bernal (AB) stacking bilayer armchair graphene nanoribbons (BiAGNRs) using the forced vibrational method. It is observed that the Raman active longitudinal optical (LO) phonon of BiAGNR is shifted downward with the decrease of the ribbon width and an increase of the vacancy concentrations. We find that vacancies induce some new peaks in the low frequency regime of the phonon density of states. Our calculated typical mode patterns elucidate that the localized transverse optical phonon at the K-point is shifted towards the defect sites from the edges with increased vacancy concentrations. In addition, the impact of defect induced phonon modes on the specific heat capacity and thermal conductivity of BiAGNRs are discussed. These results present a new way of understanding the heat dissipation phenomena of graphene-based high-performance nanodevices and to clarify the Raman and the experiments related to the phonon properties.