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Synthesis and Luminescence Properties of a Cyan-blue Thiosilicate-based Phosphor SrSi2S5:Eu2+
Masayoshi Nakamura,Hideki Kato,Yuji Takatsuka,Valery Petrykin,Satoko Tezuka,Masato Kakihana 한국정보디스플레이학회 2010 Journal of information display Vol.11 No.4
A series of Sr-Si-S compounds was synthesized using an advanced chemical method in which the use of one solution-based process uniformly dispersed the Eu2+ activators in the host crystals, to find new compositions that would suit phosphor applications. Particular focus was given to the Si-rich region. This led to the synthesis of a single-phase compound that showed an unknown X-ray diffraction pattern. This compound had a composition close to that of SrSi2S5. When this compound is activated with Eu2+ (SrSi2S5:Eu2+), it shows a cyan-blue emission with a main luminescence peak at 495 nm. This emission is excited by wavelengths of 250-440 nm and has a maximum excitation at 350 nm.
Electric-field Resonance Coupling between Human and Transmitter for Human Position Estimation System
Sousuke Nakamura,Shimon Ajisaka,Kiyoaki Takiguchi,Akira Hirose,Hideki Hashimoto 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
In this paper, a novel human position estimation system using electric-field resonance coupling is proposed. There are various advantages of using electric-field for human position estimation system. The system is robust to illumination change, body-worn tags are not required and sensors could be hidden since electric-field can path through an insulator. Tags are not required because the system estimates the position by measuring the electric field transmitted along the human body which acts as an electric-field coupler. Moreover, the proposed system has wider sensing range and higher expandability to position estimation of multiple humans compared to the current system. Unlike the current system which only measures the electric-field coupled between human and transmitter, the proposed system measures the electric-field amplified by the resonance occurring inside the human (equivalent to giant antenna) to achieve wider sensing range. Meanwhile, the proposed system is also designed carefully to maintain the expandability to multiple humans position estimation. Based on the simulation results, it is verified that the sensing range could be up to 50[cm] with less than 5[cm] error. In the future, the proposed system could be a powerful alternative for the current system.
GPU-based Acceleration of Minimum Vertex Covering for Large-scale Graphs
Kouta Toume,Hideki Kinjo,Morikazu Nakamura 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
Minimum vertex cover problems are one of the fundamental problems in graph theory and are known to be NP-hard. For structural data mining, we have proposed a GPU-based algorithm for minimum vertex cover problems. To derive sufficient parallelism for the many cores platform, the algorithm employs a distributed fashion for parallel operations, that is, GPU cores can basically perform their elemental operation only with their own data. Through the experimental evaluation, we demonstrate that our GPU algorithm implemented on both NVIDIA Fermi and Kepler GPU architectures is quite faster than a CPU version and the speedup becomes much evident when the graph size is enlarged.
Takeshi Sasagawa,Hideki Murakami,Yoshinobu Maruhashi,Takeshi Segawa,Daiki Yamamoto,Shusuke Shimizu,Yasuhiko Morita,Takuya Nakamura 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.5
Vertebral fractures occur with only slight trauma in patients with diffuse idiopathic skeletal hyperostosis (DISH). However, a lumbar vertebra fracture, due to an intraoperative body position has not been previously reported. An 87-year-old woman with kyphosis sustained a left trochanteric fracture of her femur. The patient was placed in a supine position during the operation. Postoperatively, the patient experienced severe right thigh pain. Magnetic resonance imaging revealed an L4 vertebral fracture. Computed tomography revealed ankylosis from the upper thoracic spine to the sacrum. While in a supine position under general anesthesia, the contact of the patient’s lower back with operating table likely created a fulcrum at her lumbosacral spine acting as a long lever arm, bearing the mass of her upper body. We performed L1–S2 posterior stabilization. DISH patients with kyphosis placed in a supine position have an increased risk for lumbar vertebral fracture.
Activities for Information Ethics by Citizen and Students to protect Safety and Security of Children
Kazuhiro Sumi,Makoto Junnai,Hideki Yokoo,Nobuko Ekimoto,Tatsuta Aoyagi,Noriaki Nakashima,Sinngo Nozaki,Katunori Nozaki,Takatoshi Nakamura 한국콘텐츠학회 2012 ICCC International Digital Design Invitation Exhib Vol.2012 No.12