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A Model of Multiprocessor System with Communication Delays and Its Scheduling Method
Takashi Otsuka,Hironori Youhata,Qi-Wei Ge,Mitsuru Nakata,Yuu Moriyama,Hirotoshi Tonou 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper aims at developing a scheduling method for multiprocessor systems with communication time. In this paper, we firstly propose a model of multiprocessor system with communication time occurring in reading data. Then, for the proposed model, we propose a scheduling method (called AMCN scheduling method) that (ⅰ) divides a task graph to subgraphs so that a task (called node hereafter) and its successors and predecessors are as much as possible included in the same subgraph to shorten communication time; and (ⅱ) uses a fixed processor to execute all the nodes of a subgraph. Finally, we do computational simulation experiments to evaluate our scheduling method.
Hitoshi Kudo,Kazunari Takeuchi,Toru Yokoyama,Yoshihito Yamasaki,Kanichiro Wada,Gentaro Kumagai,Toru Asari,Hironori Otsuka,Yasuyuki Ishibashi 대한척추외과학회 2019 Asian Spine Journal Vol.13 No.4
Study Design: Retrospective study. Purpose: We experienced the situation wherein some patients had new-onset pain or dysesthesia around the ring and little fingers (C8 symptom) or ulnar aspect of the forearm (T1 symptom) after cervical laminoplasty (LP). We investigated the incidence and the cause of new C8 or T1 symptoms and the clinical outcomes after C3–C6 LP or C3–C7 LP. Overview of Literature: There were some reports regarding complications after cervical LP. However, there was no report regarding C8 or T1 symptoms after cervical LP. Methods: Among the 33 patients enrolled in this study, 11 and 22 patients were treated with C3–C6 LP and C3–C7 LP, respectively. We prospectively evaluated C8 or T1 symptoms daily postoperatively for 1 week. The distance of the posterior spinal cord shifting and posterior subarachnoid space from C2 to T1 was measured by T2-weighted midsagittal magnetic resonance imaging (MRI). We evaluated pre- and postoperative axial neck pain, Japanese Orthopaedic Association (JOA) score, and JOA score improvement rate. Results: C8 or T1 symptoms occurred in five and three patients with C3–C6 LP (45.5%) and C3–C7 LP (13.6%), respectively. The distance of the posterior subarachnoid space in C3–C6 LP at C7 was significantly shorter than that in C3–C7 LP at T1 on MRI 24 hours postoperatively (p=0.0448). Postoperative axial neck pain, pre- and postoperative JOA scores, and JOA score improvement rate were not significantly different. Conclusions: The incidence of C8 or T1 symptoms in C3–C6 LP was higher than that in C3–C7 LP. C8 or T1 symptoms would be caused by the posterior fila radicularia and spinal cord impingement on the intact lower end of the lamina.