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山﨑準二著
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木村靖二, 岸本美緒, 小松久男監修
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論文（リポジトリ） |
論文（リポジトリ）
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齋藤, 将人 ; Saito, Masato ; 山里, 敬也 ; Yamazato, Takaya
概要:
筆者らは，確率共鳴現象を利用することにより，雑音と 1bit ADC (Analogue-to-Digital Converter) を用いて振幅変動を伴う信号の受信方法について理論，計算機シミュレーション，および実験による検討を行っている
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．本研究では，データ変調として BPSK (Binary Phase Shift Keying) を用いた OFDM (Orthogonal Frequency Division Multiplexing) 信号に雑音を加えた信号を 1bit ADC で量子化した信号から送信ビット列を推定する受信実験を行った．OFDM 信号を任意波形発生器で生成し，雑音発生器で生成した広帯域雑音を減衰器に通した後，送信信号に加え，高速 ADC およびデータキャプチャボードで受信した．1bit ADC はソフトウェア上で実現している．1bit ADC 出力に対して，移動平均フィルタおよび Hamming 窓を適用することにより得られた期待値を用いて復調を行った．雑音減衰量を変化させた場合におけるビット誤り率を評価した所，雑音が十分小さければ 128 ビットのデータを誤らずに送信できることを確認した．BPSK/OFDM の場合，これまでの確率共鳴に関する検討結果とは異なり，雑音が小さくなるほどビット誤り率が小さくなるという傾向が見られた．
We have been studied on receiving the signals varying those amplitude by using additional noise and 1bit ADC (Analogue-to-Digital Converter) in the framework of stochastic resonance through theoretical analysis, computer simulation, and experiments. In this study, we experimentally perform the reception of BPSK (Binary Phase Shift Keying)/ OFDM (Orthogonal Frequency Division Multiplexing) signals using additional noise and 1bit ADCs. We use an arbitrary function generator to generate BPSK/OFDM signals, a noise generator to generate wide-band white noise, and high-speed ADC and data capture board. The data obtained by the capture board is applied to 1bit ADCs realized by software. We apply moving average filter and Hamming windowing to 1bit ADC output to evaluate the expected value of the 1bit ADC input signal. BER (Bit Error Rate) performances for variable noise attenuation verified that 128 bits of transmitted data can be demodulated without error for sufficiently small noise. This tendency is different from the previous studies in the framework of stochastic resonance. 続きを見る |
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論文（リポジトリ） |
論文（リポジトリ）
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Takeshima, Masahiro ; Enomoto, Minori ; Ogasawara, Masaya ; Kudo, Mizuki ; Itoh, Yu ; Yoshizawa, Kazuhisa ; Fujiwara, Dai ; Takaesu, Yoshikazu ; Mishima, Kazuo
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論文（リポジトリ） |
論文（リポジトリ）
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吉田, 晏梨 ; Yoshida, Anri
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論文（リポジトリ） |
論文（リポジトリ）
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Futenma, Kunihiro ; Takaesu, Yoshikazu ; Nakamura, Masaki ; Hayashida, Kenichi ; Takeuchi, Noboru ; Inoue, Yuichi
概要:
Narcolepsy types 1 (NT1) and 2 (NT2) and idiopathic hypersomnia (IH) are thought to be a disease continuum known as narc
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olepsy spectrum disorders (NSDs). This study aimed to assess the prevalence of and factors associated with metabolic-syndrome-related disorders (MRDs) among patients with NSD. Japanese patients with NSD (NT1, n = 94; NT2, n = 83; and IH, n = 57) aged ≥35 years were enrolled in this cross-sectional study. MRD was defined as having at least one of the following conditions: hypertension, diabetes, or dyslipidemia. Demographic variables and MRD incidence were compared among patients in the respective NSD categories. Multivariate logistic regression analysis was used to investigate the factors associated with MRDs. Patients with NT1 had a higher body mass index (BMI) and incidence of MRD than that had by those with NT2 or IH. Age, BMI, and the presence of OSA were significantly associated with the incidence of MRD in NSDs. Age and BMI in NT1, BMI and human leukocyte antigen (HLA)-DQB1*06:02 positivity in NT2, and only age in IH were factors associated with the incidence of MRD. Obesity should be carefully monitored in narcolepsy; however, NT2 with HLA-DQB1*06:02 positive should be followed up for the development of MRD even without obesity.
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論文（リポジトリ） |
論文（リポジトリ）
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Hori, Hikaru ; Yasui-Furukori, Norio ; Hasegawa, Naomi ; Iga, Jun-ichi ; Ochi, Shinichiro ; Ichihashi, Kayo ; Furihata, Ryuji ; Kyo, Yoshitaka ; Takaesu, Yoshikazu ; Tsuboi, Takashi ; Kodaka, Fumitoshi ; Onitsuka, Toshiaki ; Okada, Tsuyoshi ; Murata, Atsunobu ; Kashiwagi, Hiroko ; Iida, Hitoshi ; Hashimoto, Naoki ; Ohi, Kazutaka ; Yamada, Hisashi ; Ogasawara, Kazuyoshi ; Yasuda, Yuka ; Muraoka, Hiroyuki ; Usami, Masahide ; Numata, Shusuke ; Takeshima, Masahiro ; Yamagata, Hirotaka ; Nagasawa, Tatsuya ; Tagata, Hiromi ; Makinodan, Manabu ; Kido, Mikio ; Katsumoto, Eiichi ; Komatsu, Hiroshi ; Matsumoto, Junya ; Kubota, Chika ; Miura, Kenichiro ; Hishimoto, Akitoyo ; Watanabe, Koichiro ; Inada, Ken ; Kawasaki, Hiroaki ; Hashimoto, Ryota
概要:
In several clinical guidelines for schizophrenia, long-term use of anticholinergic drugs is not recommended. We investig
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ated the characteristics of the use of anticholinergics in patients with schizophrenia by considering psychotropic prescription patterns and differences among hospitals. A cross-sectional, retrospective prescription survey at the time of discharge was conducted on 2027 patients with schizophrenia from 69 Japanese hospitals. We examined the relations among psychotropic drug prescriptions regarding anticholinergic prescription. We divided the hospitals into three groups— low rate group (LG), medium rate group (MG), and high rate group (HG)—according to their anticholinergic prescription rates, and analyzed the relationship between anticholinergic prescription rates and antipsychotic prescription. Anticholinergic drugs were prescribed to 618 patients (30.5%), and the prescription rates were significantly higher for high antipsychotic doses, antipsychotic polypharmacy, and first-generation antipsychotics (FGAs) use. The anticholinergic prescription rate varied considerably among hospitals, ranging from 0 to 66.7%, and it was significantly higher in patients with antipsychotic monotherapy, antipsychotic polypharmacy, and normal and high doses of antipsychotics in HG than in those LG and MG. The anticholinergics prescription rate in patients with second-generation antipsychotic monotherapy in HG was also significantly higher than in those LG and MG; however, the difference was no longer significant in patients with FGA monotherapy. Conclusively, in addition to high antipsychotic doses, antipsychotic polypharmacy, and FGA use, hospital characteristics influence the prescribing of anticholinergic drugs.
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論文（リポジトリ） |
論文（リポジトリ）
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Kinjo, Takeshi ; Toma, Hiromu ; Fujita, Jiro
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論文（リポジトリ）
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Sekiguchi, Hiroshi ; Takeuchi, Rie ; Sato, Yoko ; Matsumoto, Tsuyoshi ; Kobayashi, Jun ; Umemura, Takehiro
概要:
An earthquake with a magnitude of 8 or 9 is predicted to occur near the Ryukyu Islands in Japan, for which the Okinawa Prefecture is preparing countermeasures. Evacuating people to a safe shelter within the tsunami arrival time is a crucial
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countermeasure. This study aims to understand the vulnerabilities of patients with chronic respiratory diseases in southern parts of Okinawa during a tsunami evacuation, thereby calculating evacuation distance of vulnerable patients and creating individual evacuation plans. Data for chronic respiratory patients obtained in July 2021 from the hospitals in Okinawa Prefecture include age, gender, diagnosis, residence, nearest tsunami shelter, oxygen flow at rest and walking, and maximum walking distance for 6 min based on a 6-min walk test. A quantum geographic information system was used for mapping the data. The survival potential of patients with chronic respiratory disease was evaluated by using a tsunami inundation depth of one meter and the distance within which an evacuation can be performed until the first tsunami wave reaches the nearest evacuation shelter. Results revealed a low survival potential for respiratory disease patients under the current tsunami evacuation plan. The study suggests creating an individual evacuation plan for vulnerable patients involving families and medical staff and then conducting a drill for improving the plan.
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