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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Mihai Postolache Faculty of Automatic Control and Computer Engineering “Gheorghe Asachi” Technical University of Iasi Iasi Romania

Embedded network systems use serial communication protocols and simplified media access control schemes in order to exchange information among several interconnected nodes. Within this paper a generalization of the classical media access control (MAC) protocols used in small embedded serial networks of microcontrollers is investigated and an implementation platform for testing the proposed MAC schemes is described. Thus, the classic master-slave and token-bus protocols turn out to be just two particular cases of the proposed generalized media access control (GMAC) algorithms: a centralized and a distributed one, respectively. By applying these generalized algorithms in practice, significant increase in data throughput is obtained, as it resulted from the simulation tests and then by practical implementation on a typical embedded network of microcontrollers.

关键词： Media Access Protocol Media Master-slave Monitoring Embedded systems Communication channels

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Mesh simplification based on Willmore energy weighted quadric error metric

Mesh simplification based on Willmore energy weighted quadri...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Bogdan Apostol Vasile Manta Faculty of Automatic Control and Computer Engineering Gheorghe Asachi Technical University of Iasi Iasi Romania

Rendering, storing and transmission of high resolution models composed of large number of triangles primitives represents one of problems that scientific visualization and virtual reality faces. When these models exceed the capacity of the graphics hardware real-time rendering the solution is to simplify the mesh models by eliminating primitives from the original models while trying to keep topological information and main surface characteristics. This paper presents a new approach to the quadric error metric mesh simplification that uses the local surface features to quantify the cost of an edge collapse. We achieve this by using a weight for each quadric error processed that takes into account local Willmore energy. We defined the probability of each vertex to be decimated or not in the simplification process to be the entropy value of the vertex neighborhood Willmore energy values. We demonstrate that our method can obtain better geometric results than QSlim simplifications by preserving local features in regions of high importance for the viewer.

关键词： Measurement Surface treatment Entropy Solid modeling Visualization Energy resolution Rendering (computer graphics)

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Design and Implementation of a CAN-USB Interface for Networked Embedded Systems

Design and Implementation of a CAN-USB Interface for Network...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Constantin Abaceoae Mihai Postolache Faculty of Automatic Control and Computer Engineering “Gheorghe Asachi” Technical University of Iasi Iasi Romania

controller Area Network (CAN) is the most used protocol for intra-vehicle communication between Electronic control Units (ECUs) for decades. Moreover, there are several implementations of industrial networks built on top of CAN, (i.e. CANopen and DeviceNet) that expanded even more its area of application to almost any industrial automation field. The growing needs for data in today's modern and safe applications led to CAN Flexible Data Rate (CAN FD) in order to increase the network throughput and pushed the data field of the CAN frames beyond the 1Mbps limit of the high speed CAN chips. A low cost CAN-USB interface application for dual CAN bus network monitoring, diagnose and maintenance is proposed which can be easily ported on any member of the ARM Cortex-M microcontroller family with built-in CAN or CAN-FD communication.

关键词： Universal Serial Bus Microcontrollers Task analysis Message systems Libraries Microprogramming Microsoft Windows

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A reliable-Adaptive scheduler for computational grids with failure recovery and rescheduling mechanisms

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International Journal of Grid and Utility Computing 2011年第1期2卷 59-75页

作者： Sarhan, Amany Saleh, Ahmed I. Hamed, Amr M. Computer Engineering and Automatic Control Department Faculty of Engineering Tanta University Tanta Egypt Computer Engineering and Systems Department Faculty of Engineering Mansoura University P.O. Box 72 Mansoura Egypt

Computational grids (CGs) have become an attractive research area as they suggest a suitable environment for developing large scale parallel applications. CGs integrate a large amount of distributed heterogeneous resources into a single powerful platform. However, to make good use of CGs, grid resources should be scheduled efficiently. Various scheduling strategies have been introduced, including static and dynamic behaviours. The former maps tasks to resources at submission time, while the latter operates at schedule time. While static scheduling is unsuitable for the dynamic grid environment, scheduling in CGs is still more complex than the proposed dynamic ones. This paper introduces a decentralised adaptive grid scheduler (AGS) based on a novel rescheduling mechanism. AGS has several salient properties as it is;hybrid, adaptive, decentralised, and efficient. AGS is also robust as it has the ability to: 1 detect resource failures 2 continue its functionality in spite of the failure existence 3 recover back as soon as possible. Moreover, it integrates both static and dynamic scheduling behaviours. An initial static scheduling map is proposed for an input directed acyclic graph (DAG). However, DAG tasks may be rescheduled if the hosting resources' performance changes in a way that affects the tasks' response time. AGS tries to overcome drawbacks of traditional schedulers by utilising the mobile agent unique features to enhance the resource discovery and monitoring processes. Experimental results have shown that AGS outperforms traditional grid schedulers as it introduces a better scheduling efficiency. © 2011 Inderscience Enterprises Ltd.

关键词： Mobile agents

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A clustering algorithm for negotiating security in wireless mesh networks

A clustering algorithm for negotiating security in wireless ...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： N. Botezatu V. Manta G. Vieriu Faculty of Automatic Control and Computer Engineering Gh. Asachi Technical University of Iasi Romania

Wireless networks rely greatly on security for authentication and confidentiality, due to the use of an open communication medium. The tendency to incorporate wireless capabilities in battery powered hand-held devices makes it difficult to enforce security because of computational resources and battery capacity limitations. One approach to this problem consists in adaptable security mechanisms: different security algorithms may be enforced at any given time, to assure a proper level of protection, while respecting constraints on power and resource consumption. This paper presents such a mechanism (CLASS), which uses a clustering scheme to setup homogenous security areas in the network. The scheme is based on the available energy at every node and on the individual security requirements. By proper assignment of the nodes and by proper selection of security, we show that our method significantly reduces the average energy consumption compared to a heterogeneous network.

关键词： Peer to peer computing Energy consumption Throughput Clustering algorithms Wireless mesh networks Encryption

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RiscDaqExt – Digital Acquisition and control RISC-V Extension

RiscDaqExt – Digital Acquisition and Control RISC-V Extensi...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Cosmin-Andrei Popovici Andrei Stan Vasile-Ion Manta Department of Computer Engineering Faculty of Automatic Control and Computer Engineering Technical University "Gheorghe Asachi" Iași România

ISBN: (数字)9798350364293

ISBN: (纸本)9798350364309

This paper presents a RISC-V extension, called RiscDaqExt designed for Digital Acquisition and control over 32 individually managed digital channels. Each channel can be configured as input or output, inputs can be negated or filtered before being recorded using specific masks and output channels source can be chosen between values given with a mask, result of a multi-signal operation on specified inputs or a PWM signal generated by the SigWavy extension. The extension is also capable of measuring PWMs frequencies and duty cycles. The extension is controlled using a dedicated ISA extension containing instructions for setting/getting configuration/values and for controlling the storing records of 32 signals values with 32-bit timestamps to an attached DDR3 memory or directly to hosting PC’s RAM via Ethernet. The proposed solution, embedded into the RISC-V CPU named RiscDaq manages to initiate an Ethernet transmission of digital records 9.78x times faster than a MicroBlaze microcontroller, although our SoC operates with a 4x lower frequency, and outputs the result of logical operation performed over maximum 31 digital channels, with a constant 20 ns propagation delay, 49.2x times faster than a Cortex-M7 clocked at a 6x times higher frequency.

关键词： Time-frequency analysis Digital systems Process control Random access memory Ethernet Pulse width modulation Frequency measurement Time factors Logic Propagation delay

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Remote administration of hardware resources using TCP/IP protocol and WEB technologies

Remote administration of hardware resources using TCP/IP pro...

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International Conference and Exposition on Electrical and Power engineering (EPE)

作者： Catalin Damian Eduard Lunca Mircea Ilinca Faculty of Electrical Engineering Technical University of Iasi Romania Faculty of Automatic Control and Computer Engineering Technical University of Iasi Romania

This paper presents a combination of programming languages and web technologies used to deploy a modern remote controlled system. The hardware part of the system is a parallel port interface board that contains different types display devices, user-input components and some relays. The system functionality is based on some software applications developed using different techniques: the communication between the parallel interface, local computer and webserver PC is based on standard C, the user interface is developed using php, mysql, html and javascript technologies. Users can access full resources of the system if they are registered or only some demonstration and training sections as guest users.

关键词： Hardware IP networks computers Databases Ports (computers) Software Servers

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Correction of the on-off control system using PLC

Correction of the on-off control system using PLC

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International Scientific Conference on Electric Power engineering (EPE)

作者： Miroslaw Wcislik Michal S. Laskawski Faculty of Electric Engineering Automatic Control and Computer Science Kielce University of Technology Kielce Poland

ISBN: (纸本)9781509064076

The paper deals with an analysis of features of on-off controllers. It was assumed that the control quality can be described by three distinctive indexes: the period, the amplitude and the mean value of the controlled signal in the steady state. The on-off controller with positive hysteresis was a basic form of the controller that was analyzed. To eliminate the disadvantages of this basic form the controller structure was augmented by inertia corrector. Its impact on mentioned above indicators was shown and described. To compensate the negative influence of inertia corrector on the mean value of the controlled signal, an additional proportional corrector was proposed. Its influence on control quality was shown and discussed. To show how easy it is to build the proposed structure of the controller, its exemplary implementation in the ladder logic language of the S7-1200 PLC was described.

关键词： control systems Hysteresis Steady-state Oscillators Mathematical model Software packages Computational modeling

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Level Fuzzy control of Three-Tank System

Level Fuzzy Control of Three-Tank System

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International Conference on control Systems and computer Science (CSCS)

作者： Lucian Mastacan Constantin-Catalin Dosoftei Faculty of Automatic Control and Computer Engineering Gheorghe Asachi Technical University of Iasi Iasi Romania

ISBN: (纸本)9781467361408

Look-up decisions tables are favorites in fuzzy control when a complex algorithm of fuzzy rules inference is an impediment for a real time application. The control values of look-up tables are fuzzy singletons in finite number. It is difficult to obtain the best fuzzy control performance in these conditions. The look-up tables can be assimilated to sparse fuzzy rule bases. A linear interpolation method applied in a look-up decision table increase to a large number the fuzzy control values. In this way the fuzzy control performance can be improved. A level fuzzy control of three-tank system is implemented to validate the proposed method.

关键词： Fuzzy control Fuzzy logic Interpolation Process control Table lookup Tuning Pragmatics

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Chaotic behavior of new nonlinear electromagnetic microgenerator harvesting energy from mechanical vibrations

Chaotic behavior of new nonlinear electromagnetic microgener...

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International Symposium on Electrical Machines (SME)

作者： Mariusz Jagieła Marcin Kulik Faculty of Electrical Engineering Automatic Control & Computer Science Opole University of Technology Opole Poland

A low-frequency nonlinear cantilever-beam-type electromagnetic vibration energy harvester is analyzed. The nonlinearity brought into system kinematics by the “magnets-on-magnets” action provides approximately 20 Hz frequency bandwidth. A simulation study based on solution of coupled dynamic equations of motion and equation of electric balance shows that within major part of the bandwidth the system is capable to produces the voltage with magnitude proportional to magnitude and frequency of the excitation force. At very low frequency and large external forces it falls, however into region where it exhibits chaotic behavior. In this paper the impact of the phenomenon on waveform of the generated voltage is analyzed using the Poincare maps and spectrograms. The results prove a detrimental impact of the phenomenon on overall performance of the system. In order to avoid the chaotic operation the impact of the hard-stop barriers of relative displacement is analyzed showing rise of generated power and reduction of a low-frequency limit of the bandwidth.

关键词： Magnetic flux Force Magnetic resonance Magnetic hysteresis Magnetic cores Coils Magnetic circuits

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