منابع مشابه
Shapes and Self-Movement in Protocell Systems
The effect of shapes on self-movement has been studied with an extended model of autopoiesis. Autopoiesis is known as a theory of self-boundary maintenance. In this study, not only the autopoietic generation of the self-boundary, but also the emergence of self-motility, has been examined. As a result of computer simulations, it has been found that different membrane shapes cause different types...
متن کاملinvestigation of single-user and multi-user detection methods in mc-cdma systems and comparison of their performances
در این پایان نامه به بررسی روش های آشکارسازی در سیستم های mc-cdma می پردازیم. با توجه به ماهیت آشکارسازی در این سیستم ها، تکنیک های آشکارسازی را می توان به دو دسته ی اصلی تقسیم نمود: آشکارسازی سیگنال ارسالی یک کاربر مطلوب بدون در نظر گرفتن اطلاعاتی در مورد سایر کاربران تداخل کننده که از آن ها به عنوان آشکارساز های تک کاربره یاد می شود و همچنین آشکارسازی سیگنال ارسالی همه ی کاربران فعال موجود در...
How Indeterminism Shapes Ecologists’ Contributions to Managing Socio-Ecological Systems
To make a difference in policy making about socio-ecological systems, ecologists must grasp when decision makers are amenable to acting on ecological expertise and when they are not. To enable them to do so we present a matrix for classifying a socio-ecological system by the extent of what we don’t know about its natural components and the social interactions that affects them. We use four exam...
متن کاملLarge-Scale Dissipative and Passive Control Systems in Symmetric Shapes
We study symmetries in the design of large-scale dissipative and passive control. In the framework of dissipativity and passivity theory, stability conditions for large-scale systems are derived by categorizing agents into symmetry groups and applying local control laws under limited interconnections with neighbors. We show that there exists an upper bound on the number of subsystems that can b...
متن کاملModeling Leaf Shapes Using L-systems and Genetic Algorithms
This work presents a method that combines two techniques: L-systems and Genetic Algorithms (GA) to search for a rewriting expression describing leaf shapes. An L-system is used to construct the shape of a given rewriting expression and GA is used to search for the rewriting expression's fitting parameters. The replacement of real value parameters with tag-functions is introduced. The result sho...
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ژورنال
عنوان ژورنال: Nature
سال: 1969
ISSN: 0028-0836,1476-4687
DOI: 10.1038/2221303a0