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Evaluation of Flight Size Auto Tuning On 3.5G Commercial Wireless Packet Access Network
Katsumi Sekiguchi,Satoru Imai,Yukie Yamamoto,Noriyoshi Meuchi,Osamu Takahashi 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, we evaluate a performance of Flight Size Auto Tuning (FS-AT), a TCP congestion control method for high speed wireless access networks, on the commercial network of 3G and 3.5G mobile communication systems. HSDPA expands a bandwidth of IMT-2000 to maximum at 14Mbps. The expanded bandwidth increases bandwidth delay product (BDP) on an end-to-end channel. TCP is necessary to set congestion window (cwnd) larger than BDP to achieve maximum throughput of the channel capability. However, if cwnd becomes too large for BDP, TCP sender transmits packets excessively and packets are accumulated on a radio interwoking node. To solve this problem, FS-AT is proposed as a congestion control method for high speed wireless access networks. In this paper, we implementedFS-AT on Linux Server and evaluated its performance on the commercial packet access network of 3G and 3.5G mobile communication systems.
Hyperfractionated radiotherapy for re-irradiation of recurrent esophageal cancer
Kazuya Takeda,Haruo Matsushita,Rei Umezawa,Takaya Yamamoto,Yojiro Ishikawa,Noriyoshi Takahashi,Yu Suzuki,Keiichi Jingu 대한방사선종양학회 2021 Radiation Oncology Journal Vol.39 No.4
Purpose: Re-irradiation is a treatment option for recurrent esophageal cancer patients with a history of radiotherapy, but there is a risk of severe late adverse effects. This study focused on the efficacy and safety of re-irradiation using hyperfractionated radiotherapy. Materials and Methods: Twenty-six patients who underwent re-irradiation by the hyperfraction technique using twice-daily irradiation of 1.2 Gy per fraction for recurrent esophageal cancer were retrospectively included in this study. The overall survival period after the start of secondary radiotherapy and the occurrence of late adverse effects were investigated. Results: Of 26 patients, 21 (81%) received re-irradiation with definitive intention and 21 (81%) underwent concurrent chemotherapy. The median re-irradiation dose was 60 Gy in 50 fractions in 25 treatment days, and the median accumulated irradiation dose in equivalent dose in 2 Gy per fraction was 85.4 Gy with an α/β value of 3. The median interval between two courses of radiotherapy was 21.0 months. The median overall survival period was 15.8 months and the 1-year and 3-year overall survival rates were 64.3% and 28.3%, respectively. Higher dose of re-irradiation and concurrent chemotherapy significantly improved survival (p < 0.001 and p = 0.019, respectively). Severe late adverse effects with the Common Terminology Criteria for Adverse Events grade 3 or higher were observed in 5 (19.2%) patients, and 2 (7.7%) of them developed a grade 5 late adverse effect. Conclusion: High-dose re-irradiation using a hyperfractionated schedule with concurrent chemotherapy might be related to good prognosis, while the rate of late severe adverse effects is not high compared with the rates in past reports.