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Neurofluid Dynamics and the Glymphatic System: A Neuroimaging Perspective
Taoka Toshiaki,Naganawa Shinji 대한영상의학회 2020 Korean Journal of Radiology Vol.21 No.11
The glymphatic system hypothesis is a concept describing the clearance of waste products from the brain. The term “glymphatic system” combines the glial and lymphatic systems and is typically described as follows. The perivascular space functions as a conduit that drains cerebrospinal fluid (CSF) into the brain parenchyma. CSF guided to the perivascular space around the arteries enters the interstitium of brain tissue via aquaporin-4 water channels to clear waste proteins into the perivascular space around the veins before being drained from the brain. In this review, we introduce the glymphatic system hypothesis and its association with fluid dynamics, sleep, and disease. We also discuss imaging methods to evaluate the glymphatic system.
Building Mathematical Model of Campus through Measurement Data
Kashihara, Hironori,Taoka, Hisao,Matsuki, Junya,Kawasaki, Shoji,Matsuura, Kousuke,Funabashi, Toshihisa The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.2
In this paper, we proposed the mathematical model of campus by measurement data and theoretical approach. We measure dynamic characteristic and static characteristic of load in a system. Power capacitors in the university are assumed to be electric power customer's load. The load model is presumed by combining them and the linear model calculated theoretically. The line voltage and the line current are measured, and we calculate the line load capacity in distribution system of campus. The load fluctuation of distribution system during a day is observed. The load will be modelized by evaluating a lot of data. We can forecast the demand of electric power by few information that is the load model and the measurement data of receiving end.
Toshiya Mashima,Satoshi Taoka,Toshimasa Watanabe 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
The 3-vertex-connectivity augmentation problem of a graph with degree constraints, 3VCA-DC, is defined as follows: “Given an undirected graph G = (V,E), and an upper bound b(v) ∈ Z+ ∪ {∞} on vertex-degree increase for each v ∈ V , find a smallest set E´ of edges such that (V,E∪E´) is 3-vertex-connected and such that vertex-degree increase of each v ∈ V by the addition of E´ to G is at most b(v), where Z+ is the set of nonnegative integers.” In this paper we show that checking the existence of a feasible solution and finding an optimum solution to 3VCA-DC for any bi-connected graph G can be done in O(|V| + |E|) time.
Tanaka, Motohiro,Kawasaki, Shoji,Taoka, Hisao,Matsuki, Junya,Hayashi, Yasuhiro The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.1
In recent years, the debasement of the power quality of a distribution system such as deterioration of voltage imbalance and current imbalance or the increase of harmonics has been apprehended with diversification of the load by progress of power electronics technology and with increase of the amount of connection of a distributed generators for home use with the reduction of the effect on the environment. In this paper, the authors propose the restraint method of harmonics and improvement of voltage imbalance in distribution system utilizing the power conditioner systems of photovoltaic systems and verify the validity of the proposal method by the numerical calculation using an analytical model of distribution system.
FRT Control Method Including Islanding Detection in PCS Model for Photovoltaic Generation
Miyazaki, Takahiro,Cheng, Wai Tatt,Yoshimura, Kazuaki,Taoka, Hisao,Kawasaki, Shoji,Matsuki, Junya The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.3
In this study, we made experiments by the simulated PV system for understanding the cause of disconnection when instantaneous voltage sag occurs. Moreover, it is understood that the PCS with the voltage phase jump detection method which is one of the main causes of the disconnection. We modeled it in the simulation. When fault occurs, even though the residual voltage is more than 20 % and the voltage sag time is within 1.0 sec, the PCS disconnected by the voltage phase jump detection was confirmed in the simulation results. If a large number of PV systems are interconnected in the power system, we verified through the simulation that the interaction caused by the disconnection which generated by the voltage phase jump detection. We proposed threshold limit value of islanding detection. The validity of proposed method was verified through the simulation in this study.
Hiroki Tanaka,Shimpei Matsusaki,Youichirou Baba,Yoshiaki Isono,Tomohiro Sase,Hiroshi Okano,Tomonori Saito,Katsumi Mukai,Tetsuya Murata,Hiroki Taoka 대한소화기내시경학회 2018 Clinical Endoscopy Vol.51 No.2
Background/Aims: It is sometimes difficult to distinguish between malignant and benign biliary strictures using imaging studiesalone, and pathological diagnosis is necessary. The aim of this study was to determine the usefulness of endoscopic transpapillary tissuesampling and factors predictive of diagnostic accuracy. Methods: From April 2008 to December 2014, 136 patients underwent endoscopic transpapillary tissue sampling for malignantbiliary strictures. The cytological and histological findings were reported as negative, suspicious, or positive. Suspicious and positivefindings were defined as pathologically positive. Results: The sensitivity was 65.0% for forceps biopsy, 49.5% for brush cytology, 46.2% for bile aspiration cytology, and 21.9% forendoscopic nasobiliary drainage cytology. The combination of these procedures improved the sensitivity (72.8%). Endoscopictranspapillary tissue sampling was more sensitive for lesions of biliary origin (91.4%) than for extrabiliary lesions (66.3%). In surgicalcases, the sensitivity for tumors with an infiltrative growth pattern (53.3%) was significantly lower than for a tumor with an expandingor intermediate growth pattern (87.5%). Conclusions: Combining procedures can improve diagnostic accuracy. It may be possible to predict the sensitivity of endoscopictranspapillary tissue sampling by evaluating the etiology and tumor growth pattern using preoperative imaging studies.
Matsumoto, Kazumasa,Mochizuki, Kohei,Hirayama, Takahiro,Ikeda, Masaomi,Nishi, Morihiro,Tabata, Ken-ichi,Okazaki, Miyoko,Fujita, Tetsuo,Taoka, Yoshinori,Iwamura, Masatsugu Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.6
This study was conducted to evaluate the effectiveness of a combination of gemcitabine and nedaplatin therapy among patients with metastatic urothelial carcinoma previously treated with two lines of chemotherapy. Between February 2009 and August 2013, 30 patients were treated with gemcitabine and paclitaxel as a second-line chemotherapy. All had received a first-line chemotherapy consisting of methotrexate, vinblastine, doxorubicin and cisplatin. Ten patients who had measurable histologically proven advanced or metastatic urothelial carcinoma of the urinary bladder and upper urinary tract received gemcitabine $1,000mg/m^2$ on days 1, 8 and 15 and nedaplatin $70mg/m^2$ on day 2 as a third-line chemotherapy. Tumors were assessed by imaging every two cycles. The median number of treatment cycles was 3.5. One patient had partial response and three had stable disease. The disease-control rate was 40%, the median overall survival was 8.8 months and the median progression-free survival was 5.0 months. The median overall survival times for the first-line and second-line therapies were 29.1 and 13.9 months, respectively. Among disease-controlled patients (n=4), median overall survival was 14.2 months. Myelosuppression was the most common toxicity. There were no therapy-related deaths. Gemcitabine and nedaplatin chemotherapy is a favorable third-line chemotherapeutic option for patients with metastatic urothelial carcinoma. Given the safety and benefit profile seen in this study, further prospective trials are warranted given the implications of our results with regard to strategic chemotherapy for patients with advanced or metastatic urothelial carcinoma.