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Takahiro Ishida,Keisuke Ohira,Rio Hosoi,Naoko Tokugawa,Takahiro Tsukahara 한국항공우주학회 2022 International Journal of Aeronautical and Space Sc Vol.23 No.4
Extensive research to establish an index of roughness that causes abrupt turbulent transition downstream of the roughness and affect natural laminar flow is performed. This study investigates turbulent transitions dominated by the roughness-induced crossflow instability on a swept wing and a swept flat plate. Direct numerical simulations (DNS) are performed considering the swept wing to determine the critical roughness height that induces abrupt turbulent transition. Compared to its no-roughness counterpart, the roughness increases both the pressure drag and skin-friction drag and decreases the lift owing to the onset of upstream turbulence. The wind tunnel tests are performed considering a swept flat-plate boundary-layer model. The development of turbulent regions due to the roughness is investigated. The results reveal the occurrence of a laminar-to-turbulent transition and relaminarization, along the boundary between laminar and localized turbulent regions. Moreover, the DNS results reveal the generation of traveling crossflow vortices from the localized turbulent region.
A CG-Generated Flood-Hazard Map System Using Particle Method with 3D Digital Map
Takahiro Hirano,Mitsunori Makino 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper proposes a CG-generated flood-hazard map system with 3D digital map, in which water movement is represented by the particle method. For the given digital map of urban space, the system calculates a time series of flooding from a given washout point. Since the calculation result is interactively visualized by computer graphics technology, a user can easily understand flood influence and consult usefully the visualization for simulation of evacuation. This paper provides several simulation modes to give us a visualized information on more complicated information about flood. The implemented system with a digital map of center area in Tokyo shows its effectiveness. Since this system is not memory-hogging, the system works on the computer of low performance.
Takahiro Kitagawa,Narihito Nagoshi,Hideyuki Okano,Masaya Nakamura 대한척추신경외과학회 2022 Neurospine Vol.19 No.4
A spinal cord injury (SCI) is a destructive event that causes a permanent deficit in neurological function because of poor regenerative potential. Transplantation therapies have attracted attention for restoration of the injured spinal cord, and transplantation of neural precursor cells (NPCs) has been studied worldwide. Several groups have demonstrated functional recovery via this therapeutic intervention due to the multiple beneficial effects of NPC transplantation, such as reconstruction of neuronal circuits, remyelination of axons, and neuroprotection by trophic factors. Our group developed a method to induce NPCs from human induced pluripotent stem cells (hiPSCs) and established a transplantation strategy for SCI. Functional improvement in SCI animals treated with hiPSC-NPCs was observed, and the safety of transplanting these cells was evaluated from multiple perspectives. With selection of a safe cell line and pretreatment of the cells to encourage maturation and differentiation, hiPSC-NPC transplantation therapy is now in the clinical phase of testing for subacute SCI. In addition, a research challenge will be to expand the efficacy of transplantation therapy for chronic SCI. More comprehensive strategies involving combination treatments are required to treat this problematic situation.
Physical Educators’ Experiences Teaching Secondary English Language Learners
Takahiro Sato,Sue Sutherland 한국체육학회 2013 International journal of human movement science Vol.7 No.2
Ethnic, cultural, and linguistic diversity is becoming more prevalent in public schools within the United States (US). According to the Migration Policy Institute (2010), close to 5.3 million English Language Learners (ELLs) are enrolled in K-12 public schools in the US. Of these 5.3 million ELLs, many of whom attend urban schools, are also new to the US and are experiencing American culture for the first time. While common academic language in physical education is easily understood by English speaking students, this is not often the case for ELLs, putting them at a disadvantage in physical education. The purpose of this qualitative study was to examine and analyze eight secondary physical education teachers' experiences of teaching English Language Learners (ELLs) in urban schools. Data were collected through face-to-face and email interviews and transcribed verbatim. Transcribed data were analyzed and reduced using the constant comparative method (Merriam, 1998). The recurring themes from this study were (a) teaching normative American activities, (b) challenges and concerns of teaching PE, and (c) gender roles and religions. On a positive note, these teachers were empathetic and supportive of the ELLs in urban secondary schools. Implications include strategies for assisting physical education teachers who teach ELLs.
Artificial Intelligence in Surgery and Its Potential for Gastric Cancer
Takahiro Kinoshita,Masaru Komatsu 대한위암학회 2023 Journal of gastric cancer Vol.23 No.3
Artificial intelligence (AI) has made significant progress in recent years, and many medical fields are attempting to introduce AI technology into clinical practice. Currently, much research is being conducted to evaluate that AI can be incorporated into surgical procedures to make them safer and more efficient, subsequently to obtain better outcomes for patients. In this paper, we review basic AI research regarding surgery and discuss the potential for implementing AI technology in gastric cancer surgery. At present, research and development is focused on AI technologies that assist the surgeon's understandings and judgment during surgery, such as anatomical navigation. AI systems are also being developed to recognize in which the surgical phase is ongoing. Such a surgical phase recognition systems is considered for effective storage of surgical videos and education, in the future, for use in systems to objectively evaluate the skill of surgeons. At this time, it is not considered practical to let AI make intraoperative decisions or move forceps automatically from an ethical standpoint, too. At present, AI research on surgery has various limitations, and it is desirable to develop practical systems that will truly benefit clinical practice in the future.