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Stabilizing Control of TCP/AQM Networks with Time Delay in State Variables
Seiji Tanaka,Xin Xin,Taiga Yamasaki 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper studies how to design a congestion controller in TCP/AQM networks. In Hollotetal. (IEEE Trans. on Automatic Control, Vol.47, No.6,2002), the congestion controller is conservatively designed due to using the linearized model of the TCP/AQM networks in which a structured time-delay related term is treated as an unstructured uncertainty. Without treating anytime-delay related term as uncertainty, we provide a necessary and sufficient a condition of existence of PI stabilizing controller for the system, and we propose a new design of the congestion controller via solving a stabilization problem of the system with a time delay in the variables of both statand input. The simulation results are provided to validate the proposed design method.
Dependence of EEG response to flicker stimuli on stimulus parameters
Seiji Nishifuji,Tsukasa Shigeyama,Shogo Tanaka 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Elucidating the spatiotemporal dynamics of the EEG is crucial for applying the EEG to clinical and welfare engineering fields (e.g., a brain-computer interface (BCI) for physically disabilities). The present study focused on the EEG synchronized with flicker stimuli (steady-state visually evoked potential, SSVEP) and investigated the dependence of spatiotemporal characteristics of the SSVEP on the stimulus conditions. The SSVEP was measured from 16 subjects under the conditions of the stimulus intensity Is and stimulus frequency fs in the ranges 5 ≤ Is ≤ 300 (lx) and 7 ≤ fs ≤ 16 (Hz), respectively. Spatial phase relationship of the SSVEP from the frontal to occipital lobes showed a property of standing wave under the most of the stimulus conditions. However, the spatial phase property tended to shift to a traveling wave-type under the condition of 70 <Is < 110 (lx), indicating that the SSVEP elicited was spatially localized. This result suggests the parametric dependence of generators which are responsible for the SSVEP. Moreover, the spatial phase characteristics can be applied to discriminate between the SSVEP and various environmental noise/artifact in the BCI.
Effects of acute kidney injury after liver resection on long-term outcomes
Seiji Ishikawa,Manami Tanaka,Fumi Maruyama,Arisa Fukagawa,Nobuhiro Shiota,Satoshi Matsumura,Koshi Makita 대한마취통증의학회 2017 Korean Journal of Anesthesiology Vol.70 No.5
Background: To investigate the effects of acute kidney injury (AKI) after liver resection on the long-term outcome, including mortality and renal dysfunction after hospital discharge. Methods: We conducted a historical cohort study of patients who underwent liver resection for hepatocellular carcinoma with sevoflurane anesthesia between January 2004 and October 2011, survived the hospital stay, and were followed for at least 3 years or died within 3 years after hospital discharge. AKI was diagnosed based on the Acute Kidney Injury Network classification within 72 hours postoperatively. In addition to the data obtained during hospitalization, serum creatinine concentration data were collected and the glomerular filtration rate (GFR) was estimated after hospital discharge. Results: AKI patients (63%, P = 0.002) were more likely to reach the threshold of an estimated GFR (eGFR) of 45 ml/ min/1.73 m2 within 3 years than non-AKI patients (31%) although there was no significant difference in mortality (33% vs. 29%). Cox proportional hazard regression analysis showed that postoperative AKI was significantly associated with the composite outcome of mortality or an eGFR of 45 ml/min/1.73 m2 (95% CI of hazard ratio, 1.05–2.96, P = 0.033), but not with mortality (P = 0.699), the composite outcome of mortality or an eGFR of 60 ml/min/1.73 m2 (P = 0.347). Conclusions: After liver resection, AKI patients may be at higher risk of mortality or moderate renal dysfunction within 3 years. These findings suggest that even after discharge from the hospital, patients who suffered AKI after liver resection may need to be followed-up regarding renal function in the long term.
Keizo Fujita,Mitsuro Kanda,Seiji Ito,Yoshinari Mochizuki,Hitoshi Teramoto,Kiyoshi Ishigure,Toshifumi Murai,Takahiro Asada,Akiharu Ishiyama,Hidenobu Matsushita,Chie Tanaka,Daisuke Kobayashi,Michitaka F 대한위암학회 2020 Journal of gastric cancer Vol. No.
Purpose: Patients with pathological stage T1N+ or T2–3N0 gastric cancer may experience disease recurrence following curative gastrectomy. However, the current Japanese Gastric Cancer Treatment Guidelines do not recommend postoperative adjuvant chemotherapy for such patients. This study aimed to identify the prognostic factors for patients with pT1N+ or pT2–3N0 gastric cancer using a multi-institutional dataset. Materials and Methods: We retrospectively analyzed the data obtained from 401 patients with pT1N+ or pT2–3N0 gastric cancer who underwent curative gastrectomy at 9 institutions between 2010 and 2014. Results: Of the 401 patients assessed, 24 (6.0%) experienced postoperative disease recurrence. Multivariate analysis revealed that age ≥70 years (hazard ratio [HR], 2.62; 95% confidence interval [CI], 1.09–7.23; P=0.030) and lymphatic and/or venous invasion (lymphovascular invasion (LVI): HR, 7.88; 95% CI, 1.66–140.9; P=0.005) were independent prognostic factors for poor recurrence-free survival. There was no significant association between LVI and the site of initial recurrence. Conclusions: LVI is an indicator of poor prognosis in patients with pT1N+ or pT2–3N0 gastric cancer.
Ikeda, Hajime,Yamato, Seiji,Kajiwara, Yukari,Nishiyama, Takayuki,Tabuchi, Takanori,Tanaka, Yasushi The Korean Society of Weed Science and The Turfgra 2011 Weed Biology and Management Vol.11 No.3
Herbicidal activity and acetolactate synthase (ALS) inhibition of sulfonylurea derivatives with a fused heterocyclic moiety bonded to a sulfonyl group were investigated. Some compounds that had an imidazo[1,2-b]pyridazine moiety substituted at the 2-position by chlorine or methyl controlled sulfonylurea-resistant (SU-R) weeds and showed inhibitory activity to ALS prepared from SU-R Schoenoplectus juncoides shoot. There was a correlation between in vitro and whole-plant herbicidal activity of the compounds mentioned above against SU-R Schoenoplectus juncoides. Among them 1-(2-chloro-6-propylimidazo[1,2-b]pyridazin-3-ylsulfonyl)-3-(4,6-dimethoxypyrimidin-2-yl)urea, propyrisulfuron, was selected for further evaluation. Propyrisulfuron effectively controlled paddy weeds at doses of 70 and 140 g a.i. $ha^{-1}$ with good rice selectivity in a field trial.