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Design of Spreading Sequences with Negative Auto-correlations Based on LFSR Sequences
Yasunori Miyazaki,Akio Tsuneda,Yoshinori Higa,Takahiro Inoue 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
We design spreading sequences with negative auto-correlations based on M-sequences and Gold sequences generated by linear feedback shift registers. The proposed sequences are designed based on the chaos theory for the Bernoulli map. By numerical experiments, we confirm that the proposed sequences have negative auto-correlations which are similar to the theoretical ones.
Yasunori Miyazaki,Akio Tsuneda,Takahiro Inoue 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
Spreading sequences with exponentially vanishing negative auto-correlations can reduce bit error rate (BER) in asynchronous DS/CDMA (direct-sequence code division multiple access) systems compared with the conventional M-sequences and Gold Sequences generated by linear feedback shift registers (LFSRs). In this paper, we design spreading sequences with negative (but not exponentially vanishing) auto-correlations to be generated by LFSRs, which is based on the chaos theory for the Bernoulli chaotic map and modulo-2 added binary sequences. By numerical experiments, we investigate statistical properties (auto-/cross-correlations) of the proposed sequences.
Methane Fermentation of Artificial Food Waste using Biological Ethanol Fermentation Pretreatment
( Yasunori Kosaki ),( Munetaka Ishikawa ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
The effect of pretreatment by saccharification and ethanol fermentation on methane fermentation of food waste containing a high density of carbohydrates was studied. The ratio of methane and carbon dioxide in biogas from carbohydrates is the same stoichiometrically even if pretreatment is performed. The methane ratio in methane fermentation increases to 75% when the carbohydrate is converted to ethanol through pretreatment.In addition, this method is expected to control the generation of VFA (Volatile fatty acids) composed of three or more carbon atoms, by conversion to smaller molecules such as ethanol. To verify these effects, batch experiments were performed using artificial food waste as a substrate. It was found that the methane concentration in the biogas increases by about 10% without ethanol inhibiting the activation of biomass Further, information on the possibility of high-load operations by suppressing VFA generation was also obtained.
Yasunori Kawagoshi,Masaharu Nakao,Naoe Hino,Tomonori Iwasa,Kenji Furukawa 한국습지학회 2007 한국습지학회지 Vol.9 No.1
Effect of nitrogen-load condition on hydrogen (H2) production and bacterial community in a continuous anaerobic hydrogen fermentation were investigated. The slight H2 production on extremely low nitrogen-load condition (C/N ratio: 180) at the start-up period. The highest H2 production was obtained when the C/N ratio was 36, the H2 production yield (mol-H2 / mol-glucose) reached to 1.7, and it was indicated that Clostridium pasteurianum mainly contributed to the H2 production. The H2 production was decreased on both the lower (C/N: 72) and higher (C/N: 18) nitrogen-load conditions. The excess nitrogen-load was not always suitable for the hydrogen production. The fluctuation of H2 production seemed to be caused by a change in the bacterial community according to the nitrogen-load condition, while a recovery of H2 productivity was possible by a control of nitrogen-load condition through the bacterial community change. When the nitrogen-load condition was not suitable for hydrogen production, the lactic acid concentration was increased and also lactic acid bacteria were definitely detected, which suggested that the competition between hydrogen fermentator and lactic acid producer was occurred. These results demonstrated that the nitrogen-load condition affect on the H2 productivity through the change of bacterial community in anaerobic hydrogen fermentation.
Association Between Body Mass Index and Functional Dyspepsia in Young Japanese People
Yasunori Yamamoto,Shinya Furukawa,Junichi Watanabe,Aki Kato,Katsunori Kusumoto,Eiji Takeshita,Yoshio Ikeda,Naofumi Yamamoto,Katsuhiko Kohara,Yuka Saeki,Yoichi Hiasa 대한소화기 기능성질환∙운동학회 2022 Journal of Neurogastroenterology and Motility (JNM Vol.28 No.2
Background/AimsEvidence regarding the association between body mass index (BMI) and functional dyspepsia (FD) in the Asian population is limited. Further, no study has evaluated this issue in young people in Asian and Western populations. Thus, we aim to investigate this issue among young Japanese people. MethodsThe study subjects comprised of 8923 Japanese university students. BMI was divided into 4 categories (quartiles) on the basis of the study subjects’ distribution (lowest, low, moderate, and high [reference]). The definition of lean, normal, overweight, and obese was BMI < 18.5 kg/m2, 18.5 ≤ BMI < 25 kg/m2 (reference), 25 kg/m2 ≤ BMI < 30 kg/m2, and 30 kg/m2 ≤ BMI, respectively. The definition of FD was based on the Rome III criteria. ResultsThe prevalence of FD was 1.9% in this cohort. The lowest BMI was independently associated with FD after adjustment (adjusted odds ratio [OR], 2.88; 95% confidence interval [CI], 1.46-3.67); P for trend = 0.001). The lowest BMI was independently associated with FD in women but not in men (OR, 2.94; 95% CI, 1.59-5.77; P for trend = 0.001). Leanness was independently associated with FD in total and in women but not in men (total: adjusted OR, 2.01; 95% CI, 1.40-2.86) and women (OR, 2.19; 95% CI, 1.35-3.45). However, interaction analysis showed no significant difference for sex. ConclusionsAmong young Japanese people, BMI may be independently inversely associated with FD. Leanness may be an independent associated factor for FD in the young Japanese women.