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Effects of alginate and laminaran on the microbiota and antioxidant properties of human faecal cultures

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Food Bioscience 2022年第3期47卷 1244-1251页

作者： Gayang Lee Mika Harada Yuko Midorikawa Mahiro Yamamoto Ayaka Nakamura Hajime Takahashi Takashi Kuda Department of Food Science and Technology Tokyo University of Marine Science and Technology4-5-7 KonanMinato-kuTokyo108-8477Japan

Alginate and laminaran are water soluble dietary fibres in brown *** a previous study,pure cultures of Bacteroides xylanisolvens,Bacteroides uniformis,and Erysipelaclostridium ramosum increased antioxidant capacities in the broth with alginate and/or laminaran *** study was conducted to evaluate the presence of the alginate-and laminaran-responsive human gut indigenous bacteria(RIB)and their ***,human stool samples were cultured in media without(control),or with 1%(w/v)alginate or laminaran at 37℃ for 24 h under anaerobic *** showed that during incubation,the pH of the culture reduced with the *** production was clearly suppressed via laminaran supplementation in the faecal sample *** 16S rRNA(V4)gene amplicon sequencing confirmed that ***-,*** and ***-like bacteria were alginate-and/or laminaran-RIB in human gut,although their read numbers differed among ***,some butyrate-producers,such as Faecalibacterium and Roseburia,were also detected as the RIB in alginate and laminaran cultures,*** increased 1,1-diphenyl-2-picrylhydrazyl and superoxide anion radical-scavenging capacities and the Fe-reducing power of the culture ***,the fermented cultures increased the nitric oxide secretion in macrophage like RAW 264.7 cells *** results suggest that the interaction of alginate and laminaran with their RIB may have desirable effects on the host as next generation prebiotics when brown algae are ingested.

关键词： Alginate Laminaran Human gut microbiota Antioxidant capacity Faecal culture

Pricing Policy for a Dynamic Spectrum Allocation Scheme with Batch Requests and Impatient Packets in Cognitive Radio Networks

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Journal of Systems Science and Systems Engineering 2022年第2期31卷 133-149页

作者： Haixing Wu Shunfu Jin Wuyi Yue School of Information Science and Engineering Yanshan UniversityQinhuangdao 066004China Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province Yanshan UniversityQinhuangdao 066004China Department of Intelligence and Informatics Konan UniversityKobe 658-8501Japan

In cognitive radio networks(CRNs),multiple secondary users may send out requests simultaneously and one secondary user may send out multiple requests at one time,i.e.,request arrivals usually show an aggregate ***,a secondary user packet waiting in the buffer may leave the system due to impatience before it is transmitted,and this impatient behavior inevitably has an impact on the system *** to investigate the influence of the aggregate behavior of requests and the likelihood of impatience on a dynamic spectrum allocation scheme in CRNs,in this paper a batch arrival queueing model with possible reneging and potential transmission interruption is *** constructing a Markov chain and presenting a transition rate matrix,the steady-state distribution of the queueing model along with a dynamic spectrum allocation scheme is derived to analyze the stochastic behavior of the ***,some important performance measures such as the loss rate,the balk rate and the average delay of secondary user packets are ***,system experiments are carried out to show the change trends of the performance measures with respect to batch arrival rates of secondary user packets for different impatience parameters,different batch sizes of secondary user packets,and different arrival rates of primary user ***,a pricing policy for secondary users is presented and the dynamic spectrum allocation scheme is socially optimized.

关键词： Cognitive radio networks dynamic spectrum scheme batch arrival impatient packets Markov chain social optimization

Essential Tori in 3-String Free Tangle Decompositions of Links

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Acta Mathematica Sinica,English Series 2008年第6期24卷 1023-1030页

作者： Kanji MORIMOTO Department of IS and Mathematics Konan UniversityHigashi-NadaOkamoto 8-9-1Kobe 658-8501Japan

The author characterizes those link types which have 3-string essential free tangle decompositions and have essential tori in their exteriors.

关键词： links free tangle decompositions essential tori

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Photosynthetic recovery of desiccated intertidal seaweeds after rehydration

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Progress in Natural Science:Materials International 2005年第8期15卷 689-693页

作者： TANAKA Jiro Japan konan-4 Minato-ku Tokyo 108-8477 Tokyo university of Marine Science and Technology

Intertidal seaweeds experience periodical desiccation and rehydration to different extents due to the tidal cycles and their vertical distributions. Their photosynthetic recovery process during the rehydration may show different patterns among the seaweeds from different zonations or depths at intertidal zone. In this study 12 species of seaweeds collected from the upper, middle, lower and sublittoral zones were examined. The relationship of the photosynthetic recovery to vertical distribution was assessed by comparing their patterns of photosynthetic and respiratory performances after rehydration following desiccation. Both the photosynthesis and dark respiration declined during emersion, showing certain degrees of recovery after re-immersion into seawater for most species, but the extents were markedly different from one species to the other. The species from upper intertidal zone after being rehydrated for 1 hour, following 2 hours of desiccation, achieved 100% recovery of their initial physiological activity, while most of the lower or sublittoral species did not achieve full recovery. It is the ability to withstand desiccation stress (fast recovery during rehydration), but not that to avoid desiccation (water retaining ability) that determines the distribution of intertidal seaweeds. Such physiological behavior during rehydration after desiccation reflects the adaptive strategy of intertidal seaweeds against desiccation and their capability of primary production in the process of rehydration.

关键词： seaweeds desiccation emersion intertidal photosynthetic recovery.

A Virtual Machine Scheduling Strategy with a Speed Switch and a Multi-Sleep Mode in Cloud Data Centers

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Journal of Systems Science and Systems Engineering 2019年第2期28卷 194-210页

作者： Shunfu Jin Shanshan Hao Xiuchen Qie Wuyi Yue School of Information Science and Engineering Yanshan University Qinhuangdao China Department of InteDigence and Informatics Konan University Kobe Japan

With the rapid growth of energy costs and the constant promotion of environmental standards, energy consumption has become a significant expenditure for the operating and maintaining of a cloud data center. Io improve the energy efficiency of cloud data centers, in this paper, we propose a Virtual Machine (VM) scheduling strategy with a speed switch and a multi-sleep mode. In accordance with the current traffic loads, a proportion of VMs operate at a low speed or a high speed, while the remaining VMs either sleep or operate at a high speed. Commensurate with our proposal, we develop a continuous-time queueing model with an adaptive service rate and a partial synchronous vacation. We construct a two dimensional Markov chain based on the total number of requests in the system and the state of all the VMs. Using a matrix geometric solution, we mathematically estimate the energy saving level and the response performance of the system. Numerical experiments with analysis and simulation show that our proposed VM scheduling strategy can effectively reduce the energy consumption without significant degradation in response performance. Additionally;we establish a system utility function to trade off the different performance measures. In order to determine the optimal sleep parameter and the maximum system utility function, we develop an improved Firefly intelligent searching Algorithm.

关键词： Cloud data center virtual machine scheduling speed switch multi-sleep matrix geometricSolution utility function improved Firefly Algorithm

System Model and Equilibrium Strategy of Mobile Users in a Hybrid Access Network

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Journal of Systems Science and Systems Engineering 2019年第2期28卷 224-237页

作者： Dongmei Zhao Shunfu Jin Wuyi Yue School of Information Science and Engineering Yanshan UniversityQinhuangdao 066000 China Department of Intelligence and Informatics Konan University Kobe Japan

Mobile users usually access the Internet via a hybrid access network, in which cellular and Wi-Fi networks are available alternatively. In the hybrid access network, a mobile user decides to send or not to send a packet according to the number of packets already in the system and the phase of the server. In order to evaluate the system performance of the hybrid access network, in this paper we first establish a fully observable continuous time Markovian queueing system. Then, we present an exact analysis to investigate the behavior of the mobile users in the network. Through iterations and diagonalization, we obtain the expected sojourn time of a newly arriving packet in a closed form. Moreover, with the monotonicity for the expected sojourn time of a newly arriving packet, we prove the existence of the Nash equilibrium strategy. Finally, we analyze the socially optimal strategy and motivate the mobile users to accept the socially optimal strategy by changing the sojourn cost.

关键词： Hybrid access network observable queueing system expected sojourn time Nash equilibriumstrategy socially optimal strategy

Pulsed field magnetization of multiple bulks used as field pole of a high-temperature superconducting rotating machine

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Superconductivity 2023年第1期5卷 63-68页

作者： Antomne A.Caunes Mizuki Tsuchiya Hayato Imamichi Nagisa Kawasumi Mitsuru Izumi Tetsuya Ida Tokyo university of Marine Science and Technology 4-5-7KonanMinato-kuTokyo 108-8477Japan National Institute of Technology Toba College1-1Ikegami-choTobaMie 517-8501Japan

An array of three GdBa_(2)Cu_(3)O_(7‐δ)bulk high‐temperature superconductors(HTS)that mimic the field pole of a high‐power superconducting motor had been magnetized by pulsed field magnetization(PFM)while cooled by liquid *** bulk array was magnetized by a passive PFM technique using three vortex‐type coils placed over each individual bulk and connected in *** trapped magnetic flux density distribution was comparable to the distribution obtained with more traditional quasi‐static magnetization such as field‐*** suggests that the use of PFM technique on arrays of HTS bulks is *** has also been performed using each coil individually,to magnetize each bulk *** magnetization sequences showed a maximum reduction of the peak trapped magnetic flux density of 12%due to the demagnetization effect of the magnetization sequence,while the trapped magnetization distribution was improved.

关键词： Pulsed field magnetization HTS bulk Bulk HTS field pole Multiple bulks array Large field pole Superconducting rotating machines

Preface of the Special Issue: Queueing Systems and Engineering Applications

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Journal of Systems Science and Systems Engineering 2019年第2期28卷 129-131页

作者： Wuyi Yue Yutaka Takahashi Department of Intelligence and Informatics Konan University Kobe 658-8501 Japan Graduate School of Informatics Kyoto University Kyoto 606-8501 Japan

This volume of the Journal of Systems Science and Systems Engineering is devoted to the extended versions of papers selected and presented at the 12th International Conference on Queueing Theory and Network Applicatio... 详细信息

关键词： Systems 12th Applications

Characteristics of Amorphous Mn_3AlC Phases Formed by Mechanical Milling

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Journal of Materials Science & Technology 1997年第2期13卷 149-153页

作者： Fuxing YIN Nanju GU (Hebei Institute of Technology, Tianin 300132, China)T.Shigematsu N.Nakanishi(Faculty of Science, konan university Kobe 658, Japan)Y.Osawa A.Sato(National Research Institute of Metals, Tsukuba 305, Japan) Hebei Institute of Technology Tianjin 300132 China Faculty of Science Konan University Kobe 658 Japan National Research Institute of Metals Tsukuba 305 Japan

Amorphization of Mn carbides by rapid quenching method has been proved to be *** mechanical milling in the present work, amorphous phases have been formed in the perovskitetype Mn3AlC compound. The transformation process from crystalline to amorphous phase was found to be milling time controlled, and 10 h is a critical period for the macroscopically single amorphous phase to form. It has been clarified that the redistribution of C atoms is an instinctive factor for amorphous phase to nucleate, and the atomic configuration in the amorphous phase is changed much in longer milling that different crystallizing behaviours have been caused. With X-ray diffraction and differential scanning calorimetry (DSC) results, an atomic configuration transition model is considered for the structures of the amorphous phases changed during milling.

关键词： Mn Ta

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