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- 저자 : Nagao Yuji (검색결과 3 건)
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Low Complexity Iterative Precoder for Downlink MU-MIMO Systems
Naotaka Yoshida,Yuji Yokota,Yuhei Nagao,Hiroshi Ochi 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
Block diagonalization (BD) precoder is used for Multi-User Multiple Input Multiple Output (MU-MIMO) IEEE 802.11ac Wireless LAN. To improve the latency of the MU-MIMO systems, the BD precoder using iterative calculation has been proposed. We call this method Iterative BD (IBD). IBD can start the MU-Precoder weight matrix calculation even before all user’s channel state information (CSI) are received. However IBD has a higher complexity compared to non-iterative BD because of the overhead of iterative calculation. In this paper, we reduce the complexity due to the iteration process by computing the null space needed in the IBD method together with the channel matrix decompression which is applied by CSI feedback process based on IEEE802.11ac. We show that our method can significantly reduce the complexity of IBD.
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C5 Palsy of Patients with Proximal-Type Cervical Spondylotic Amyotrophy
Imajo Yasuaki,Nishida Norihiro,Funaba Masahiro,Nagao Yuji,Suzuki Hidenori,Sakai Takashi 대한척추외과학회 2022 Asian Spine Journal Vol.16 No.5
Study Design: An observational cohort study design was adopted in this study.Purpose: This study was designed to investigate preoperative factors that predict poor outcomes following surgery in patients with proximal-type cervical spondylotic amyotrophy (PCSA) using radiological findings.Overview of Literature: We evaluated the preoperative factors associated with poor outcomes using electrophysiological and neurological findings. However, the preoperative factors associated with poor outcomes remained unclear.Methods: Sixty patients with PCSA who underwent surgical treatment of the cervical spine were enrolled. The radiological findings on plain radiographs, computed tomography (CT), and magnetic resonance imaging (MRI) were evaluated. The cervical lordotic angles, C2–C7 sagittal vertical axis (SVA), and T1 slope were assessed on a lateral radiograph in the neutral position. CT was used to assess the width of the intervertebral foramen and the anterior protrusion of the superior articular process on the axial view. MRI was used to determine the number of levels of compression (NLC) and the presence of a high-intensity area in the spinal cord in the T2- weighted midsagittal view. The preoperative and postoperative strengths of the most atrophic muscles were evaluated using manual muscle testing. Improvements in strength were classified as excellent (five grades recovered), good (more than one grade recovered), fair (no improvement), or poor (worsened).Results: The prevalence of C5 palsy was 17% (10/60). Patients with poor outcomes had higher NLC and Δ C2–C7 SVA than patients with excellent, good, and fair outcomes (p =0.015; odds ratio [OR], 5.758; 95% confidence interval [CI], 1.397−23.726 for a change of 10% and p =0.048; OR, 1.068; 95% CI, 0.992−1.141 for a change of 10%, respectively).Conclusions: ΔC2–C7 SVA and NLC may be used as prognostic factors for achieving a poor outcome following surgery in patients with PCSA. More focus is needed on preventing the increase in ΔC2–C7 SVA.
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