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检索条件"任意字段=2004年生命系统建模仿真国际会议暨第一届全国生命系统建模仿真学术会议"

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Modeling Leaves Based on Real Image

Modeling Leaves Based on Real Image

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2004年生命系统建模仿真国际会议暨第一届全国生命系统建模仿真学术会议

作者： CAO Yu-kun, LI Yun-feng, ZHU Qing-sheng, LIU Yin-bin ( College of Computer Science, Chongqing University, Chongqing 400044, China Department of Economics and Management, Tongji University, Shanghai 200092, China)

Plants have complex structures. The shape of a plant component is vital for capturing the characteristics of a species. One of the challenges in computer graphics is to create geometry of objects in an intuitive and direct way while allowing interactive manipulation of the resulting shapes. In this paper, an interactive method for modeling leaves based on real image is proposed using biological data for individual plants. The modeling process begins with a one-dimensional analogue of implicit surfaces, from which a 2D silhouette of a leaf is generated based on image segmentation. The silhouette skeleton is thus obtained. Feature parameters of the leaf are extracted based on biologically experimental data, and the obtained leaf structure is then modified by comparing the synthetic result with the real leaf so as to make the leaf structure more realistic. Finally, the leaf mesh is constructed by sweeps.

关键词： leaf modeling L-systems mesh images segmentation

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In Vitro Mitral Simulator to Evaluate Effectiveness of Valvoplasty Technique

In Vitro Mitral Simulator to Evaluate Effectiveness of Valvo...

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2004年生命系统建模仿真国际会议暨第一届全国生命系统建模仿真学术会议

作者： H.Doi M.Arita M.Okuda R.Noda K.Iwasaki T.Tanaka H.Kasegawa M.Umezu Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Yasuhisa Biomechanics Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Hanzomon Cardiovascular Clinic Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan

The edge-to-edge technique is one of the surgical procedures for anterior mitral leaflet prolapse. The purpose of this study is to evaluate the effect of this technique by using an in vitro mitral simulator. The resul... 详细信息

关键词： mitral valve anterior mitral leaflet prolapse edge-to-edge technique EBM

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Simulating Human Cognitive Using Computational Verb Theory

Simulating Human Cognitive Using Computational Verb Theory

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2004年生命系统建模仿真国际会议暨第一届全国生命系统建模仿真学术会议

作者： YANG Tao (Department of Electrical Engineering and Computer Science, Yang's Scientific Research Institute, 1303 East University Blvd, Tucson, Arizona 85719-0521, USA)

Modeling and simulation of a life system is closely connected to the modeling of cognition, especially for advanced life systems. The primary difference between an advanced life system and a digital computer is that the advanced life system consists of a body with mind while a digital computer is only a mind in a formal sense. To model an advanced life system one needs to symbols into a body where a digital computer is embedded. In this paper, a computational verb theory is proposed as a new paradigm of grounding symbols into the outputs of sensors. On one hand, a computational verb can preserve the physical "meanings" of the dynamics of sensor data such that a symbolic system can be used to manipulate physical meanings instead of abstract tokens in the digital computer. On the other hand, the physical meanings of an abstract symbol/token, which is usually an output of a reasoning process in the digital computer, can be restored and fed back to the actuators. Therefore, the computational verb theory bridges the gap between symbols and physical reality from the dynamic cognition perspective.

关键词： computational verb theory computational cognition physical linguistics cognitive structure symbol grounding mind-body problem

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In Vitro Hydrodynamic Test and InVitro Hemolysis Test for Development of Inexpensive Spiral Vortex Ventricular Assisting System Using IABP Console

In Vitro Hydrodynamic Test and InVitro Hemolysis Test for De...

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2004年生命系统建模仿真国际会议暨第一届全国生命系统建模仿真学术会议

作者： Y.Ohnishi K.Iwasaki H.Mizuta T.Sudo S.Muto T.Shima T.Tanaka K.Ito M.Umezu Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Yasuhisa Biomechanics Inc. Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan

The purpose of this research is to develop an inexpensive pulsatile blood pump system for short-term use, as a combination of the usage of IABP console and spiral vortex pump. In vitro hydrodynamic test and in vitro h... 详细信息

关键词： inexpensive ventricular assisting system spiral vortex pump IABP console hyarodynamic performance hemolysis

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Biomedical Engineering Approach to Evaluate Anastomosis Methods for Coronary Artery Bypass Grafting

Biomedical Engineering Approach to Evaluate Anastomosis Meth...

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2004年生命系统建模仿真国际会议暨第一届全国生命系统建模仿真学术会议

作者： M.Umezu J.Kawai J.Suehiro M.Arita Y.Shiraishi K.Iwasaki T.Tanaka H.Niinami Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Yasuhisa Biomechanics Inc. Tokyo Japan Dept. of Cardiovascular Surgery Juntendo Medical University Tokyo Japan

There are two different methods for coronary artery bypass grafting: end-to-side and side-to-side anastomosis. In vitro mock test, flow visualization and animal experiments were performed in parallel to compare the hemodynamic effect between two methods. Thus, bioengineers can provide practical useful information to the clinical team.

关键词： coronary artery bypass grafting coronary simulator side-to-side anastomosis flow visualization

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The Analysis of Artificial Retina Organization for Signal Processing

The Analysis of Artificial Retina Organization for Signal Pr...

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2004年生命系统建模仿真国际会议暨第一届全国生命系统建模仿真学术会议

作者： WEI Hui (Department of Computer Science, Lab of Algorithm for Cognitive Model, Brain Science Research Center, Fudan University, Shanghai 200433, China)

Machine vision is an active branch of artificial intelligence. An important problem in this area is the trade-off among efficiency, accuracy and computation complexity. The human visual system can keep watchfulness to the perimeter of a viewing field while at the same time focus on the center of the field for fine information processing. This mechanism of appropriate assignment of computing resources can reduce the demand for huge and complex hardware structure. Therefore, the design of a computer model based on the biological visual mechanism is an effective approach to resolve problems in machine vision. In this paper, a multi-layer neural model is developed based on the features of receptive field of ganglion in retina to simulate multi-scale perceptive fields of ganglion cell. The neural model can maintain alert on the outer area of the image while capturing and processing more important information in the central part. It may provide valuable inspiration for the implementation of real-time processing and avoidance of huge computation in machine vision.

关键词： computer vision neuro-vision

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MIMO Adaptive Control System for Human Arterial Blood Pressure bv Drue

MIMO Adaptive Control System for Human Arterial Blood Pressu...

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2004年生命系统建模仿真国际会议暨第一届全国生命系统建模仿真学术会议

作者： XI Bei-li, HE Guo-sen ( Shanghai Xuhui Central Hospital, Shanghai 200031, China School of Mechatronical Engineering and Automation, Shanghai University, Shanghai 200072, China)

This paper presents modeling and simulation of a multi-input multi-output (MIMO) adaptive control system (ACS) for human arterial blood pressure (HASP) by multiple drug inputs -infusion speed (IS) control of inotropic agent (IA) and vasoactive agent (VA). The MIMO ACS is able to choose the most appropriate IS of IA and VA at good IS in order to maintain the aortic pressure (AOP) and central vain pressure (CAP) at desired levels, and at the same time to increase the cardiac output (CO). This ACS simulation consists of 3 parts: the system model (SM), the identifier (ID), and the explicit multivanable self-turning controller (MSC). The SM is a 2-input 2-output bilinear model with nonwhite system noise. The variable ID is capable of estimating the variable onset delay model (BNVD). The ID is capable of estimating the variable onset delay online by compressing the value in gaining the unbiased parameter estimation with an improved generalized least-squares (LS) algorithm. The MSC employs the minimum variance one-step-ahead control law. These three parts make a closed-loop control system successfully for heart disease patients during and after the operation.

关键词： simulation cardiovascular system modeling adaptive control

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绵羊急性缺血性左心衰竭模型的建立

绵羊急性缺血性左心衰竭模型的建立

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2004年生命系统建模仿真国际会议暨第一届全国生命系统建模仿真学术会议

作者：李智成陈长志范关荣叶清成少飞王维俊汤敏赵晓刚 Y.John Gu 上海第二医科大学附属仁济医院胸心外科上海第二医科大学附属仁济医院胸心外科上海第二医科大学附属仁济医院胸心外科上海第二医科大学附属仁济医院胸心外科上海第二医科大学附属仁济医院胸心外科上海第二医科大学附属仁济医院胸心外科上海第二医科大学附属仁济医院胸心外科上海第二医科大学附属仁济医院胸心外科荷兰Groningen大学医院胸心外科

目的模拟临床病人,建立简易可靠、相对稳定、重复性好的大动物缺血性急性左心衰竭模型.方法16只雌性绵羊,体重36.80±3.43 kg.麻醉后开胸并建立有创测压管,监测心输出量(CO)、动脉收缩压(SBP)、舒张压(DBP)、平均动脉压(MAP)、中心... 详细信息

目的模拟临床病人,建立简易可靠、相对稳定、重复性好的大动物缺血性急性左心衰竭模型.方法16只雌性绵羊,体重36.80±3.43 kg.麻醉后开胸并建立有创测压管,监测心输出量(CO)、动脉收缩压(SBP)、舒张压(DBP)、平均动脉压(MAP)、中心静脉压(CVP)、右室舒张末压(RVEDP)、左房压(LAP)和左室舒张末压(LVEDP).部分阻断冠状动脉左旋支中段,使其部分狭窄,同时心电监测。心电图示心肌缺血后,开始心脏逐步快速起搏(120～180次/min),监测血流动力学.急性心力衰竭模型须符合如下两项:(1)CO减少到基线值的75%以下;(2)MAP减少到基线值的75%以下.结果10只绵羊心力衰竭诱导成功,2只绵羊在PUCA泵导管植入时因技术问题出现大出血而死亡,另外4只在部分阻断左旋支结合快速起搏后发生顽固性室颤,复苏失败.心力衰竭模型建立后CO和MAP明显下降,CO从3.74±0.48 L/min减至2.02±0.51 L/min(p<0.001),MAP从116.10±14.15 mmHg降到68.10±14.72mmHg(p<0.001),CVP从7.10±2.18mmHg升至10.70±3.50mmHg(p<0.05),LAP从8.10±2.13mmHg升至12.00±4.57mmHg(p<0.01),LVEDP和RVEDP虽然也升高,但无统计学意义.结论部分阻断冠状动脉左旋支中段结合心脏逐步起搏建立了急性左心衰竭模型.该方法简单易行、相对稳定、重复性好,可用于评估心脏辅助装置的辅助效果.

关键词：急性心力衰竭绵羊模型心肌梗死心室起搏

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搏动性导管泵对羊急性心力衰竭血流动力学的影响

搏动性导管泵对羊急性心力衰竭血流动力学的影响

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2004年生命系统建模仿真国际会议暨第一届全国生命系统建模仿真学术会议

作者：陈长志李智成范关荣叶清成少飞王维俊汤敏赵晓刚 Y.John Gu 上海第二医科大学仁济医院胸心外科上海第二医科大学仁济医院胸心外科上海第二医科大学仁济医院胸心外科上海第二医科大学仁济医院胸心外科上海第二医科大学仁济医院胸心外科上海第二医科大学仁济医院胸心外科上海第二医科大学仁济医院胸心外科上海第二医科大学仁济医院胸心外科荷兰Groningen大学医院胸心外科

评估搏动性导管(PUCA)泵对急性心力衰竭绵羊模型的血流动力学影响.16只绵羊进行左心衰竭诱导,其中10只诱导成功,诱导成功的绵羊随后行PUCA泵辅助,辅助时间为3 h.分别于心力衰竭前、心力衰竭时及辅助后每隔30 min监测并记录血流动力学参... 详细信息

评估搏动性导管(PUCA)泵对急性心力衰竭绵羊模型的血流动力学影响.16只绵羊进行左心衰竭诱导,其中10只诱导成功,诱导成功的绵羊随后行PUCA泵辅助,辅助时间为3 h.分别于心力衰竭前、心力衰竭时及辅助后每隔30 min监测并记录血流动力学参数.10只绵羊中7只成功支持达到规定的时间,另3只绵羊因技术原因未能完成实验,其中1只PUCA泵导管未能通过主动脉瓣而进入左心室,1只因导管插入太深致使导管瓣膜亦位于左心室,1只辅助1 h后,因低血钾突然心跳停止死亡.成功的7只绵羊在支持期间血流动力学逐步恢复并趋向稳定,血压接近正常的基线值.SBP从(86.57±17.03)mmHg升高到(124.00±25.94)mmHg (p=0.004),DBP从(7.71±12.62)mmHg升高到(89.29±16.67)mmHg(p=0.002),MAP从(68.86±15.23)mmHg升高到(105.14±19.13)mmHg(p=0.001),但CO、CVP、RVEDP、LAP和LVEDP没有明显的变化.首次用PUCA泵辅助成功地维持急性心力衰竭绵羊的血流动力学3 h.因此,对稳定急性心力衰竭动物的血流动力学有效.如进一步改进PUCA泵的制作工艺和植入途径,该泵有望应用于临床急性心力衰竭的病人以维持其血流动力学.

关键词：急性心力衰竭辅助循环微型搏动性导管泵

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