检索结果-南通市图书馆

A Design of Model Following Control System for the Linear Discrete Time with Disturbances

在线全文

学校读者我要写书评

暂无评论

International Journal of Systems and Control

International Journal of Systems and Control 2008年第3期 180-186页

作者： okubo shigenori Faculty of Engineering Yamagata University Jonan 4-3-16

In this paper,we propose a design of linear discrete time model following control system(MFCS) with *** previous studies,a method of MFCS was proposed by *** and *** [1] ～ [6].In this paper,the method of MFCS will be extended to discrete time *** bounded property of internal states for control system is given and utility of this control design is *** simulation is given to illustrate the effectiveness of the proposed method.A new criterion system is proposed.

关键词： discrete time model following control system(MFCS) disturbances.

The Design of Nonlinear Servo System using Fuzzy Method

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Design of Nonlinear Servo System using Fuzzy Method

Challenging situation of coronary artery anomaly associated with ischemia and/or risk of sudden death

第24届中国控制与决策会议

作者： Mohd Khairi bin Mohamed Nor shigenori okubo System and Information Engineering Graduate School of Science and Engineering Yamagata University

In this paper, the design of the nonlinear fuzzy servo system will be discussed. The idea behind of this control method is to divide the operating region of nonlinear servo system into small areas, and treated as a collection of local linear servo systems. The control rule of each local linear servo systems has been calculated using Davison-Smith Method. Fuzzy method has been applied to each local linear servo system and combines it as new control rule. The Lyapunov stability theory is used to develop the bounded condition for the proposed system. The simulation of the inverted pendulum system has been done to illustrate the effectiveness of the proposed method. The result shows that the proposed method can stabilize the system.

关键词： Nonlinear servo system Fuzzy control Davison-Smith method Inverted pendulum system

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

World Journal of Cardiology 2024年第4期16卷 173-176页

作者： shigenori Ito Division of Cardiology Sankuro HospitalToyota 471-0035Japan

Coronary artery anomaly is known as one of the causes of angina pectoris and sudden death and is an important clinical entity that cannot be *** incidence of coronary artery anomalies is as low as 1%-2%of the general population,even when the various types are *** anomalies are practically challenging when the left and right coronary ostium are not found around their normal positions during coronary angiography with a *** there is atherosclerotic stenosis of the coronary artery with an anomaly and percutaneous coronary intervention(PCI)is required,the suitability of the guiding catheter at the entrance and the adequate back up force of the guiding catheter are *** level of PCI risk itself should also be considered on a caseby-case *** this case,emission computed tomography in the R-1 subtype single coronary artery proved that ischemia occurred in an area where the coronary artery was not visible to the naked *** follow-up would be crucial,because sudden death may occur in single coronary *** prevent atherosclerosis with full efforts is also important,as the authors indicated admirably.

关键词： Coronary artery anomaly Single coronary artery Ischemia Sudden death Percutaneous coronary intervention Coronary vessel anomalies Myocardial ischemia Sudden cardiac death

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

广义线性系统模型跟踪控制的新方法

信息与控制 2000年第3期29卷 198-204,210页

作者：唐厚君韩正之尚宇辉大久保重范上海交通大学智能工程研究所上海200030 山形大学工学部

:本文讨论广义线性系统的模型跟踪控制问题 ,提出了一种新的设计方法 ,该方法无须对系统作状态变换 ,因而能保留系统模型所具有的物理意义 .文章证明了这种设计方法的状态变量都是有界的。

关键词：模型跟踪控制广义线性系统系统矩阵

基于模糊理论关于非线性系统稳定性控制方法的阐述

在线全文

学校读者我要写书评

暂无评论

科技资讯 2011年第21期9卷 244-244页

作者：于淼宇 shigenori okubo faculty of engineering yamagata university

非线性控制系统一直是目前控制理论研究的重点,无论是变结构控制,神经网络控制,还是模糊控制都可以对不同的控制系统起到一定的效果,在本文中将基于模糊控制,介绍一种设计简便的大域非线性控制器,并将证明这种控制方法的大域有界性。

关键词：非线性模糊控制大域有界

Origin of the Earth:A proposal of new model called ABEL

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2017年第2期8卷 253-274页

作者： shigenori Maruyama Toshikazu Ebisuzaki Earth-Life Science Institute Tokyo Institute of Technology Institute for Study of the Earth's Interior Okayama University RIKEN

The Earth was born as a dry planet without atmosphere and ocean components at 4.56 Ga,with subsequent secondary accretion of bio-elements,such as carbon（C）,hydrogen（H）,oxygen（O）,and nitrogen（N） which peaked at 4.37-4.20 *** two-step formation model of the Earth we refer to as the advent of bio-elements model（ABEL Model） and the event of the advent of bio-elements（water component） as ABEL *** is clear that the solid Earth originated from enstatite chondrite-like dry material based on the similarity in oxygen isotopic composition and among other *** the other hand,Earth＇s water derives primarily from carbonaceous chondrite material based on the hydrogen isotopic *** present our ABEL model to explain this enigma between solid Earth and water,as well as secondary accretion of oxidizing bio-elements,which became a precursor to initiate metabolism to emerge life on a highly reductive *** ABEL Bombardment had not occurred,life never would have emerged on the ***,ABEL Bombardment is one of the most important events for this planet to evolve into a habitable *** chronology of ABEL Bombardment is informed through previous researches of the late heavy bombardment and the late veneer *** Bombardment is considered to have occurred during 4.37-4.20 Ga,which is the concept to redefine the standard late heavy bombardment and the late veneer ***,ABEL Bombardment is the trigger of the transition from stagnant lid tectonics to plate tectonics on this planet because of the injection of volatiles into the initial dry Earth.

关键词： Origin of Earth and life Advent of bin-elements (ABEL)Origin of water on the Earth ABEL Bombardment Habitable Trinity planet Initiation of plate tectonics

Formation of anorthosite on the Moon through magma ocean fractional crystallization

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2017年第2期8卷 299-308页

作者： Tatsuyuki Arai shigenori Maruyama Department of Earth and Planetary Sciences Tokyo Institute of Technology2-12-10okayamaMeguro-kuTokyo 152-8551Japan Earth-Life Science Institute Tokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo 152-8551Japan

Lunar anorthosite is a major rock of the lunar highlands,which formed as a result of plagioclasefloatation in the lunar magma ocean（LMO）.Constraints on the sufficient conditions that resulted in the formation of a thick pure anorthosite（mode of plagioclase 〉95 vol.%） is a key to reveal the early magmatic evolution of the terrestrial *** form the pure lunar anorthosite,plagioclase should have separated from the magma ocean with low crystal *** networks of plagioclase and mafic minerals develop when the crystal fraction in the magma（φ） is higher than ca.40-60 vol.%,which inhibit the formation of pure *** contrast,when φ is small,the magma ocean is highly turbulent,and plagioclase is likely to become entrained in the turbulent magma rather than separated from the *** determine the necessary conditions in which anorthosite forms from the LMO,this study adopted the energy criterion formulated by *** composition of melt,temperature,and pressure when plagioclase crystallizes are constrained by using MELTS/pMELTS to calculate the density and viscosity of the *** plagioclase starts to crystallize,the Mg~# of melt becomes 0.59 at 1291 *** density of the melt is smaller than that of plagioclase for P 〉 2.1 kbar（ca.50 km deep）,and the critical diameter of plagioclase to separate from the melt becomes larger than the typical crystal diameter of plagioclase（1.8-3 cm）.This suggests that plagioclase is likely entrained in the LMO just after the plagioclase starts to *** the Mg~# of melt becomes 0.54 at 1263 C,the density of melt becomes larger than that of plagioclase even for 0 *** the Mg~# of melt decreases down to 0.46 at 1218 C,the critical diameter of plagioclase to separate from the melt becomes 1.5-2.5 cm,which is nearly equal to the typical plagioclase of the lunar *** suggests that plagioclase could separate from the *** of the differences between the Earth and the Moon is the presenc

关键词： Moon Anorthosite Magma ocean MELTS Fractional crystallization

Origins of building blocks of life: A review

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2018年第4期9卷 1117-1153页

作者： Norio Kitadai shigenori Maruyama Earth-Life Science Institute Tokyo Institute of Technology

How and where did life on Earth originate？ To date, various environments have been proposed as plausible sites for the origin of life. However, discussions have focused on a limited stage of chemical evolution, or emergence of a specific chemical function of proto-biological systems. It remains unclear what geochemical situations could drive all the stages of chemical evolution, ranging from condensation of simple inorganic compounds to the emergence of self-sustaining systems that were evolvable into modern biological ones. In this review, we summarize reported experimental and theoretical findings for prebiotic chemistry relevant to this topic, including availability of biologically essential elements（N and P） on the Hadean Earth, abiotic synthesis of life＇s building blocks（amino acids, peptides, ribose, nucleobases, fatty acids, nucleotides, and oligonucleotides）, their polymerizations to bio-macromolecules（peptides and oligonucleotides）, and emergence of biological functions of replication and compartmentalization. It is indicated from the overviews that completion of the chemical evolution requires at least eight reaction conditions of（1） reductive gas phase,（2） alkaline pH,（3） freezing temperature,（4）fresh water,（5） dry/dry-wet cycle,（6） coupling with high energy reactions,（7） heating-cooling cycle in water, and（8） extraterrestrial input of life＇s building blocks and reactive nutrients. The necessity of these mutually exclusive conditions clearly indicates that life＇s origin did not occur at a single setting; rather, it required highly diverse and dynamic environments that were connected with each other to allow intratransportation of reaction products and reactants through fluid circulation. Future experimental research that mimics the conditions of the proposed model are expected to provide further constraints on the processes and mechanisms for the origin of life.

关键词： Astrobiology Biochemistry Chemical evolution Extraterrestrial life Hadean Earth Hydrothermal systems

United theory of biological evolution:Disaster-forced evolution through Supernova,radioactive ash fall-outs,genome instability,and mass extinctions

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2015年第1期6卷 103-119页

作者： Toshikazu Ebisuzaki shigenori Maruyama RIKEN 2-1Hirosawa Earth-Life Science Institute Tokyo Institute of Technology

We present the disaster-forced biological evolution model as a general framework that includes Darwinian ＂phylogenic gradualism＂, Eldredge-Gould＇s ＂punctuated equilibrium＂, mass extinctions, and allopatric, parapatric, and sympatric speciation. It describes how reproductive isolation of organisms is established through global disasters due to supernova encounters and local disasters due to radioactive volcanic ash fall-outs by continental alkaline volcanism. Our new evolution model uniquely highlights three major factors of disaster-forced speciation： enhanced mutation rate by higher natural radiation level, smaller population size, and shrunken habitat size （i.e., isolation among the individual pop- ulations）. We developed a mathematical model describing speciation of a half-isolated group from a parental group, taking into account the population size （Ne）, immigration rate （m）, and mutation rate （μ）. The model gives a quantitative estimate of the speciation, which is consistent with the observations of speciation speed. For example, the speciation takes at least 105 generations, if mutation rate is less than 10 3 per generation per individual. This result is consistent with the previous studies, in which μ is assumed to be 10 3-10-5. On the other hand, the speciation is much faster （less than l0S generations） for the case that μ is as large as 0.1 in parapatric conditions （m 〈 μ）. Even a sympatric （m ~ 1 ） speciatiou can occur within 103 generations, if mutation rate is very high （μ- 1 mutation per individual per generation）, and if Ne 〈 20-30. Such a high mutation rate is possible during global disasters due to supernova encounters and local disasters due to radioactive ash fall-outs. They raise natural radiation level by a factor of 100-1000. Such rapid speciation events can also contribute to macro-evolution during mass extinction events, such as observed during the Cambrian explosion of biodiversity. A similar rapid speciation （though in a much smaller scale）

关键词： Speciation Supernova encounter Continental alkaline volcanism Cichlid Great African ape Cambrian explosion