A Constraint Solving System and Approach Based on Graph Theory and Floating DOF

2013 ◽  
Vol 444-445 ◽  
pp. 894-900
Author(s):  
Li Jiang ◽  
Bu Ying Xie ◽  
Kai Hu
Keyword(s):  
Graph Theory ◽  
Parametric Design ◽  
The State ◽  
Plane Geometry ◽  
Constraint Solving ◽  
System Changes ◽  
Flow Effects ◽  
Rules Changes ◽  
Parameter Values

Parametric design is a kind of concept to build and analyze models by using parameters or variables rather than digits. Models with different specifications can be achieved by changing the parameter values which are associated with the establishment by labeling the size and adding a variety of constraints. To represent the solving system of plane geometry constraints, the concept of floating DOF is applied based on graph theory to represent the state of the constraints system. And through the establishment of the variable passing rules, changes of the parameters can be shown as rational flow effects in graphs so that the system can give a clearly expression and achieve the fast driven effect of the graphics system changes.

Beyond Neo-Colonialism: Varieties of Corporatism in Africa

1982 ◽  
Vol 20 (2) ◽  
pp. 239-261 ◽  
Author(s):  
Timothy M. Shaw
Keyword(s):  
World System ◽  
The State ◽  
Super Structure ◽  
Ongoing Process ◽  
The World ◽  
System Changes ◽  
Political Economies

Although the essential character of Africa's dependence on the world system changes very slowly, if at all, particular aspects of it are always in flux. For whilst dependence continues to generate underdevelopment, some growth has occurred in several countries at particular periods with important implications for certain classes. The incorporation of the continent into the world system is an ongoing process that reflects shifts in (i) the nature of the world system, and (ii) the nature of Africa's political economies. The sub-structure of the periphery – the capitalist and extractive modes and relations of production – evolves slowly, but the super-structure – the politics and ideology of the state – are considerably more volatile. Given the organic links between the sub- and super-structure, the instability of the latter affects the continuity of the former.

scholarly journals Every laboratory with a fluorescence microscope should consider counting molecules

2014 ◽  
Vol 25 (10) ◽  
pp. 1545-1548 ◽  
Author(s):  
Valerie C. Coffman ◽  
Jian-Qiu Wu
Keyword(s):  
Mathematical Modeling ◽  
Fluorescence Microscopy ◽  
Protein Complexes ◽  
The State ◽  
Fluorescence Microscope ◽  
Cellular Structures ◽  
Biological Processes ◽  
Protein Molecules ◽  
Parameter Values

Protein numbers in cells determine rates of biological processes, influence the architecture of cellular structures, reveal the stoichiometries of protein complexes, guide in vitro biochemical reconstitutions, and provide parameter values for mathematical modeling. The purpose of this essay is to increase awareness of methods for counting protein molecules using fluorescence microscopy and encourage more cell biologists to report these numbers. We address the state of the field in terms of utility and accuracy of the numbers reported and point readers to references for details of specific techniques and applications.

Online Hate Crimes Against Women (CYBER VAWG)

2020 ◽  
pp. 591-605
Author(s):  
Tehmina Khan
Keyword(s):  
Literature Review ◽  
Hate Crimes ◽  
The State ◽  
Meaning Potential ◽  
Starting Point ◽  
System Changes ◽  
Crimes Against Women

In this article, a review of Cyber VAWG is provided with its meaning, potential impacts, the state of legislation to address Cyber VAWG, and recommendations to improve processes and systems to tackle Cyber VAWG. A literature review of academic and nonacademic literature has been undertaken. It is found that legislation and enforcement are still in infancy and there are currently complexities and barriers that are discouraging the reporting of Cyber VAWG. The article serves as a starting point for further research which should address the actual implementation of legislative and system changes to avoid and punish (in cases where it does occur) Cyber VAWG.

FLUCTUATIONS IN THE STATE OF CHAOS-CHAOS INTERMITTENCY OF CHUA’S CIRCUIT

1995 ◽  
Vol 05 (01) ◽  
pp. 271-273
Author(s):  
M. KOCH ◽  
R. TETZLAFF ◽  
D. WOLF
Keyword(s):  
Power Spectrum ◽  
Initial Conditions ◽  
Piecewise Linear ◽  
The State ◽  
Circuit Parameter ◽  
Chua’S Circuit ◽  
External Excitation ◽  
Chua's Circuit ◽  
Parameter Values

We studied the power spectrum of the normalized voltage across the capacitor parallel to a piecewise-linear resistor of Chua’s circuit in the “chaos-chaos intermittency” state [Anishchenko et al., 1992]. The investigations included various initial conditions and circuit parameter values without and with external excitation. In all cases we found spectra showing a 1/ω2-decay over more than four decades.

Design Shell for Parametric Design at Embodiment Stage

2003 ◽  
Author(s):  
Adwait Vaidya ◽  
Jami Shah
Keyword(s):  
Parametric Design ◽  
Problem Definition ◽  
Design Stage ◽  
Embodiment Design ◽  
System Requirements ◽  
Parameter Values ◽  
Domain Independent

The embodiment design stage involves determination of geometric sizes, key parameter values, and matching of component variables to system requirements. This embodiment design stage can be parametrically represented as an iterative design-redesign problem. This paper presents a domain independent characterization of such problems; the characterization includes problem definition, design relations/procedures, and measures of goodness. The paper also discusses representation issues and solution techniques for design-redesign problems. Design tasks are differentiated as domain independent or problem specific and the scope of each design task with respect to the characterization is delineated. A Design Shell implemented on the basis of this characterization is described. This shell can be configured for evaluating designs in any domain. A case study illustrates the use of this Design Shell in characterizing a specific design problem and exploring its design space.

scholarly journals Parametric Design of Aircraft Wing with Curved Leading Edge

2018 ◽  
Vol 9 (1) ◽  
pp. 93-104 ◽  
Author(s):  
Abdelkader BENAOULI ◽  
Stanisław KACHEL
Keyword(s):  
Programming Language ◽  
Iterative Process ◽  
Parametric Design ◽  
Leading Edge ◽  
Parametric Model ◽  
Aircraft Wing ◽  
Cad Tools ◽  
New Model ◽  
Design Variables ◽  
Parameter Values

In order to ease modelling procedures, eliminate repetitive effort and save time, modern CAD tools offer the ability to automate tasks via a programming language. Moreover, when the design is an iterative process, the automation permits updating the design variables to generate a new model at each iteration. Based on UG/OPEN GRIP functionalities, this paper aims at developing a parametric model of a curved leading edge aircraft wing. The model is built by executing a GRIP program in which wing parameter values can be assigned via a dialog box.

scholarly journals The Control System of the Femur-Tibia Joint in the Standing Leg of a Walking Stick Insect Carausius Morosus

1983 ◽  
Vol 102 (1) ◽  
pp. 175-185 ◽  
Author(s):  
H. CRUSE ◽  
J. SCHMITZ
Keyword(s):  
Control System ◽  
Stick Insect ◽  
The State ◽  
Alternative States ◽  
Carausius Morosus ◽  
Generalized System ◽  
System Changes ◽  
Walking Stick

The control system of the femur-tibia joint of the stick insect (Carausius tnorosus) shows different properties depending on whether the animal is standing or walking. The properties of the system were examined when the animal was walking on a treadwheel and when the examined leg rested on a platform fixed beside the wheel. The results show that the properties of the system in the standing leg of a walking animal are similar to those of a walking animal rather than those of the standing animal. This indicates that the state of the leg (standing or walking) does not seem to be controlled by the neural subsystem of the leg itself but by a more generalized system, which differs in its properties depending upon whether the whole animal is standing or walking. Furthermore the results show how the behaviour of the system changes for the two alternative states.

A Hybrid Relationship Modeling Scheme for Parametric Design Considering Uncertainties

2008 ◽  
Author(s):  
Dong Zhao ◽  
Deyi Xue
Keyword(s):  
Optimal Design ◽  
Design Optimization ◽  
Parametric Design ◽  
Random Parameters ◽  
Computer Tool ◽  
Different Types ◽  
Relationship Network ◽  
Parameter Values ◽  
Random Uncertainties ◽  
Fuzzy Parameters

This research introduces a new scheme to model different types of relationships in parametric design considering uncertainties. First a hybrid parameter relationship network is developed to associate the parameters through their relationships. In this hybrid parameter relationship network, in addition to the deterministic parameters and relationships, non-deterministic parameters (e.g., random parameters and fuzzy parameters) and non-deterministic relationships (e.g., neural network relationships and fuzzy relationships) can also be modeled. Propagation of parameter values and their uncertainties through this hybrid parameter relationship network is then investigated. Two optimization mechanisms, probability based design optimization and possibility based design optimization, are employed to identify the optimal design considering objective random uncertainties and subjective fuzzy uncertainties. A computer tool has been implemented and used for the optimal design of a solid oxide fuel cell (SOFC) system.

A Development Methodology for Parametric Synthesis Tools

2007 ◽  
Author(s):  
Wouter O. Schotborgh ◽  
Maarten H. L. Ro¨ring ◽  
Roxana Grigoras ◽  
Frans G. M. Kokkeler ◽  
Hans Tragter ◽  
...  
Keyword(s):  
Engineering Design ◽  
Design Process ◽  
Parametric Design ◽  
Solution Space ◽  
Constraint Solving ◽  
Functional Requirements ◽  
Design Quality ◽  
Parametric Synthesis ◽  
Engineering Design Process ◽  
Machine Elements

Software to support the solution generation phase of the engineering design process has been developed in academia for decades. Computational synthesis software enables generation of solutions on both conceptual and embodiment level. This paper focuses on the class of parametric design, such as documented in mechanical engineering handbooks. Examples include machine elements such as bearings, springs, fasteners, transmissions, etc. A parametric synthesis tool automates the engineering design process from functional requirements to quantified solutions, for a single machine element. Since the amount of machine elements is vast and software development time should be low, a generic methodology is helpful to speed up this process. This paper discusses such a methodology to develop synthesis tools for the class of parametric designs. It includes an analysis-oriented approach to formalize the design process’ parameters in terms of embodiment, performance and scenario. Mathematical constraint solving techniques are used to generate candidate solutions. Graphical presentation and exploration of the solution space is done with interactive plots. A standardized layout for the graphical user interface is suggested to allow uniform and intuitive use. A demonstrator is developed using the described methodology and several challenges are discussed for improved constraint solving techniques, more advanced visualization and handling problems with higher complexity. Although small in size, parametric design processes are time consuming due to their reoccurring nature. Developing synthesis tools for these designs will allow engineers to save time and improve design quality.

Data Assimilation for a Coupled Ocean–Atmosphere Model. Part II: Parameter Estimation

2008 ◽  
Vol 136 (12) ◽  
pp. 5062-5076 ◽  
Author(s):  
Dmitri Kondrashov ◽  
Chaojiao Sun ◽  
Michael Ghil
Keyword(s):  
Parameter Estimation ◽  
State Estimation ◽  
Tropical Pacific ◽  
The State ◽  
Vector Model ◽  
Model Parameters ◽  
Ocean Atmosphere ◽  
Augmented State ◽  
Parameter Values ◽  
The Tropical Pacific

Abstract The parameter estimation problem for the coupled ocean–atmosphere system in the tropical Pacific Ocean is investigated using an advanced sequential estimator [i.e., the extended Kalman filter (EKF)]. The intermediate coupled model (ICM) used in this paper consists of a prognostic upper-ocean model and a diagnostic atmospheric model. Model errors arise from the uncertainty in atmospheric wind stress. First, the state and parameters are estimated in an identical-twin framework, based on incomplete and inaccurate observations of the model state. Two parameters are estimated by including them into an augmented state vector. Model-generated oceanic datasets are assimilated to produce a time-continuous, dynamically consistent description of the model’s El Niño–Southern Oscillation (ENSO). State estimation without correcting erroneous parameter values still permits recovering the true state to a certain extent, depending on the quality and accuracy of the observations and the size of the discrepancy in the parameters. Estimating both state and parameter values simultaneously, though, produces much better results. Next, real sea surface temperatures observations from the tropical Pacific are assimilated for a 30-yr period (1975–2004). Estimating both the state and parameters by the EKF method helps to track the observations better, even when the ICM is not capable of simulating all the details of the observed state. Furthermore, unobserved ocean variables, such as zonal currents, are improved when model parameters are estimated. A key advantage of using this augmented-state approach is that the incremental cost of applying the EKF to joint state and parameter estimation is small relative to the cost of state estimation alone. A similar approach generalizes various reduced-state approximations of the EKF and could improve simulations and forecasts using large, realistic models.

Sign in / Sign up

Export Citation Format

Share Document