scholarly journals SYNCHRONIZATION BASED ON GLOBAL STATES AS A GENERAL CONTROL METHOD IN PARALLEL PROGRAMS

2014 ◽  
pp. 12-20
Author(s):  
J. Borkowski ◽  
M. Tudruj ◽  
D. Kopanski
Keyword(s):  
Message Passing ◽  
Control Method ◽  
Time Interval ◽  
Programming Environment ◽  
General Control ◽  
Asynchronous Computation ◽  
Synchronization Mechanisms ◽  
Global Predicates ◽  
Strongly Consistent ◽  
Global States

New parallel program synchronization mechanisms are presented. A specialized synchronizer process, or a hierarchy of such processes, gather information about process states and construct Strongly Consistent Global States, using time interval timestamps. Global predicates evaluated by synchronizers can cause synchronization signals to be sent to processes, the signals trigger asynchronous computation activation or cancellation. The proposed framework is integrated with a message passing system - it is added to the GRADE graphical parallel programming environment to enhance its message-passing based features. Architecture and implementation of the enhancement are discussed.

Assessment of Aedes aegypti (Diptera: Culicidae) Males Flight Ability for SIT Application: Effect of Device Design, Duration of Test, and Male Age

2019 ◽  
Vol 57 (3) ◽  
pp. 824-829 ◽  
Author(s):  
Ariane Dor ◽  
Ana María Maggiani-Aguilera ◽  
Javier Valle-Mora ◽  
J Guillermo Bond ◽  
Carlos F Marina ◽  
...  
Keyword(s):  
Quality Control ◽  
Aedes Aegypti ◽  
Control Method ◽  
Flight Test ◽  
Test Time ◽  
Time Interval ◽  
Flight Ability ◽  
Young Males ◽  
Male Age ◽  
Standard Quality

Abstract The Sterile Insect Technique (SIT) is a pest control method where large numbers of sterile males are released to induce sterility in wild populations. Since a successful SIT application depends on the released sterile males being competitive with wild males, standard quality control tests are a necessary component of any SIT program. Flight ability (ability to fly out from a device) is a reliable indicator of insect quality. Based on previous studies, we developed four new tubular devices constructed with locally available materials to explore their potential as flight test devices for Aedes aegypti (L.) mass-reared males. Males were allowed to fly upwards through a vertical tube, the ones that flew out were considered successful. The effect of male age (0 to 21 d old), test time interval (30 min to 24 h), and the design of the device (40 and 80 cm height and 2 and 3.5 cm diameter) were evaluated. Our devices determined differences in the flight ability of Ae. aegypti males of different ages. During the first minutes, more old males escaped than young males in three out of four types of devices. However, young males reached higher rates of escape in all cases after 24 h. For standard quality control tests, we recommend testing 2- to 3-d-old sexually mature males in the high and narrow device (80 × 2 cm). Further observations for time intervals between 1 and 5 h might be performed to decide the shortest and more representative interval to use.

High Performance Structural Vibration Control by a Preview of the Future Seismic Waveform Generated With a Wave Transmission Network and an AI-Based Estimation System

2019 ◽  
Author(s):  
Kazuhiko Hiramoto ◽  
Taichi Matsuoka ◽  
Katsuaki Sunakoda
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Small Scale ◽  
Control Law ◽  
Time Interval ◽  
Transmission Network ◽  
Control Performance ◽  
Seismic Waveform ◽  
The Future ◽  
Estimation System

Abstract We propose a new active vibration control strategy based on the future seismic waveform information obtained in remote observation sites. The waveform information in the remote site is transmitted by a waveform transmission network to the structure under control. The waveform transmission network is realized by interconnecting multiple controlled structures and observation sites. By using the future waveform information obtained through the network, we propose a control law realizing fairly higher control performance over the conventional structural control methodologies. A preview control law consisting of the state-feedback and feedforward control (preview action) is adopted. For the preview action, future values of the disturbance in some time interval are necessary. However, because the future value of the earthquake waveform is unknown, the preview action contributing the performance improvement is generally impossible. To get over this difficulty, an AI-based wave estimation system to estimate the future earthquake waveform is proposed. The wave estimation system is a multi-layered artificial neural network (ANN). Through a small scale simulation study with a recorded earthquake event in Japan, we show that the proposed control method achieves much higher control performance over the conventional LQ-based active control.

scholarly journals Kemari: A Portable High Performance Fortran System for Distributed Memory Parallel Processors

1997 ◽  
Vol 6 (1) ◽  
pp. 41-58 ◽  
Author(s):  
T. Kamachi ◽  
A. MÜller ◽  
R. RÜhl ◽  
Y. Seo ◽  
K. Suehiro ◽  
...  
Keyword(s):  
Message Passing ◽  
High Performance ◽  
Message Passing Interface ◽  
Data Distribution ◽  
Programming Environment ◽  
Performance Measurements ◽  
High Performance Fortran ◽  
Additional Control ◽  
Compilation Process ◽  
Structured Problems

We have developed a compilation system which extends High Performance Fortran (HPF) in various aspects. We support the parallelization of well-structured problems with loop distribution and alignment directives similar to HPF's data distribution directives. Such directives give both additional control to the user and simplify the compilation process. For the support of unstructured problems, we provide directives for dynamic data distribution through user-defined mappings. The compiler also allows integration of message-passing interface (MPI) primitives. The system is part of a complete programming environment which also comprises a parallel debugger and a performance monitor and analyzer. After an overview of the compiler, we describe the language extensions and related compilation mechanisms in detail. Performance measurements demonstrate the compiler's applicability to a variety of application classes.

Adaptive Iterative Learning Control for Nonlinear Systems With Unknown Control Gain1

2004 ◽  
Vol 126 (4) ◽  
pp. 916-920 ◽  
Author(s):  
Huadong Chen ◽  
Ping Jiang
Keyword(s):  
Nonlinear Systems ◽  
Iterative Learning Control ◽  
Control Method ◽  
Learning Control ◽  
Iterative Learning ◽  
Time Interval ◽  
Learning Gain ◽  
Adaptive Iterative Learning Control ◽  
Control Gain ◽  
Unknown Control

An adaptive iterative learning control approach is proposed for a class of single-input single-output uncertain nonlinear systems with completely unknown control gain. Unlike the ordinary iterative learning controls that require some preconditions on the learning gain to stabilize the dynamic systems, the adaptive iterative learning control achieves the convergence through a learning gain in a Nussbaum-type function for the unknown control gain estimation. This paper shows that all tracking errors along a desired trajectory in a finite time interval can converge into any given precision through repetitive tracking. Simulations are carried out to show the validity of the proposed control method.

scholarly journals A New Scheduling Quantitative Feedback Theory-Based Controller Integrated with Fault Detection for Effective Vibration Control

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
R. Jeyasenthil ◽  
Yang-Sup Lee ◽  
Seung-Bok Choi
Keyword(s):  
Fault Detection ◽  
Control Method ◽  
Point Of View ◽  
Smart Structure ◽  
Time Interval ◽  
Time Varying ◽  
Quantitative Feedback Theory ◽  
Control Effort ◽  
Single Input Single Output ◽  
Single Output

In this work, a new integrated fault detection and control (IFDC) method is presented for single-input/single-output systems (SISOs). The idea is centered on comparing the closed-loop output between the faulty system and fault-free one to schedule/switch the feedback control once the fault occurs. The problem addressed in this work is the output disturbance rejection. The set of feedback controllers are designed using quantitative feedback theory (QFT) for fault-free and faulty systems. In the context of QFT-based IFDC, the proposed active approach is novel, simple, and easy to implement from an engineering point of view. The efficiency of the proposed method is assessed on a flexible smart structure system featuring a piezoelectric actuator. The actuator and sensor faults considered are the multiplicative type with both fixed and time-varying magnitudes. In the fixed magnitude fault case, the actuator/sensor output delivering capability is reduced by 50% (multiplying a factor of 0.5 to its actual output), while in the time-varying magnitude case, it becomes 60% to 50% for a particular time interval. In both cases, the proposed control method identifies the fault and activates the required controller to satisfy the specification with less control effort as opposed to the passive QFT design featured by faulty system design alone.

scholarly journals Robot Extenics Control Developed by Versatile, Intelligent and Portable Robot Vipro Platform Applied on Firefighting Robots

2020 ◽  
Vol 16 (08) ◽  
pp. 99
Author(s):  
L Vladareanu ◽  
V. Vlădareanu ◽  
N. Pop ◽  
M. Migdalovici ◽  
M. Boșcoianu ◽  
...  
Keyword(s):  
Intelligent Control ◽  
Robot Control ◽  
Control Method ◽  
Dc Motor ◽  
Programming Environment ◽  
Matlab Simulink ◽  
Platform Architecture ◽  
Control Interface ◽  
Improved Performance ◽  
Universe Of Discourse

<p>The firefighting robot control using intelligent Extenics control interfaces ICEx developed by versatile, intelligent and portable robot VIPRO platform is presented. Subsequently, VIPRO platform architecture, the innovative versatile, intelligent, portable platform, is applied on firefighting robots VIP- FiR&amp;FiTRo, Extenics intelligent control and Universe of Discourse in an Extenics Transformation are detailed.  The Extenics Control Method with Fuzzy Smoothing is developed and tested using a simple DC motor configuration in the Matlab / Simulink programming environment. A sequence for the Intelligent Control Interface Code integrated into the VIPRO is presented. The results prove the possibilities for tweaking and optimizing by intelligent Extenics control developed on VIPRO platform in order to obtain improved performance are virtually limitless.</p>

scholarly journals Partially controlling transient chaos in the Lorenz equations

2017 ◽  
Vol 375 (2088) ◽  
pp. 20160211 ◽  
Author(s):  
Rubén Capeáns ◽  
Juan Sabuco ◽  
Miguel A. F. Sanjuán ◽  
James A. Yorke
Keyword(s):  
Nonlinear Dynamics ◽  
Control Method ◽  
Fixed Time ◽  
Three Dimensions ◽  
Transient Chaos ◽  
Time Interval ◽  
Lorenz Equations ◽  
Major Step ◽  
Partial Control ◽  
Practical Applications

Transient chaos is a characteristic behaviour in nonlinear dynamics where trajectories in a certain region of phase space behave chaotically for a while, before escaping to an external attractor. In some situations, the escapes are highly undesirable, so that it would be necessary to avoid such a situation. In this paper, we apply a control method known as partial control that allows one to prevent the escapes of the trajectories to the external attractors, keeping the trajectories in the chaotic region forever. We also show, for the first time, the application of this method in three dimensions, which is the major step forward in this work. To illustrate how the method works, we have chosen the Lorenz system for a choice of parameters where transient chaos appears, as a paradigmatic example in nonlinear dynamics. We analyse three quite different ways to implement the method. First, we apply this method by building an one-dimensional map using the successive maxima of one of the variables. Next, we implement it by building a two-dimensional map through a Poincaré section. Finally, we built a three-dimensional map, which has the advantage of using a fixed time interval between application of the control, which can be useful for practical applications. This article is part of the themed issue ‘Horizons of cybernetical physics’.

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