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Journal articles on the topic 'Digital control systems. eng'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Yue, Ming, and Bao Guang Wang. "Servo Motor Control Lifter Systems by Digital PID Control Method." Applied Mechanics and Materials 130-134 (October 2011): 256–59. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.256.

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Aiming at the wild used tide gauge, a research project has been made. The purpose of the project is to build a standard test equipment which is used for calibration. The principle of the tide gauge is imitating water-level fluctuation of diurnal tides or semi-diurnal tides, based on controlling dynamic water flow which is 10 meters high and 8 tons heavy. This is a national standard test equipment which will be used by Tianjin National oceanic standard measuring center. In this paper, the digital PID control method is used for computerizing servo motor .First, the principle of servo motor contr

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Dochviri, J. "Optimization of Control Processes of Digital Electrical Drive Systems." Latvian Journal of Physics and Technical Sciences 47, no. 2 (2010): 16–24. http://dx.doi.org/10.2478/v10047-010-0005-2.

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Optimization of Control Processes of Digital Electrical Drive Systems The aim of the work is solution of the problems associated with synthesis of the digital speed regulators both for DC and AC thyristor electrical drives. The investigation is realized based on the parameters of continuous technological equipment (e.g. paper-making machine) by taking into account elastic transmission links of the drive systems. Appropriate frequency characteristics and transient processes are described.

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Kondo, E., T. Kiyota, and T. Sunaga. "Closed-Loop Expression of Fixed-end-point LQ Optimal Control for Digital Systems." IFAC Proceedings Volumes 26, no. 2 (1993): 721–26. http://dx.doi.org/10.1016/s1474-6670(17)49224-x.

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Wu, Y. C., Zhi Yong Zuo, and Y. Sun. "Applied Research of Full Digital Electric Control Systems on Rebuild Machine Tool." Materials Science Forum 626-627 (August 2009): 399–404. http://dx.doi.org/10.4028/www.scientific.net/msf.626-627.399.

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Taking account of the situation of many old-fashioned imported machine tools, this paper proposes some favourable methods of rebuilding equipment. In theory and practice, with full digital electric system of modern automation technology, rebuilt equipments are easy to operate and reduce energy consumption, raise production efficiency. It realizes the aim of Environment-friendly and resource-economical. In this paper, it also gives three typical examples of rebuilding equipment, table planning machine made in Germany, D2300 lathe and 745A slotter made in Russia. Some pragmatic issues have been

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Xiong, Li Rong. "Simulating Analysis and Choosing Control Method on the Speed Control of Egg Quality’s Detection." Advanced Materials Research 268-270 (July 2011): 1179–83. http://dx.doi.org/10.4028/www.scientific.net/amr.268-270.1179.

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This fuzzy speed controller is designed and applied in induction motor drive systems. MATLAB software fuzzy logic toolbox is used to the single closed-loop induction motor speed control system for computer-aided design, and SIMULINK dynamic digital simulation is used to achieve optimal control parameters. Tests show that the fuzzy control process is overshoot, response time is short, the system oscillation amplitude is low, it is the optimum control strategy.

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Tomizuka, Masayoshi. "On the Design of Digital Tracking Controllers." Journal of Dynamic Systems, Measurement, and Control 115, no. 2B (1993): 412–18. http://dx.doi.org/10.1115/1.2899081.

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This paper describes my work on the design of digital tracking controllers over the past two decades. In tracking control, the control object must be moved along a time varying desired output and the transient path error must be minimized. Tracking control is discussed for the following two typical situations: one is the situation where the desired output is known in advance and the other is where the desired output itself is not known but has a certain known property, e.g., it is periodic with a known period. Control algorithms for dealing with these situations will be reviewed and applicatio

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Tekinerdogan, Bedir, and Cor Verdouw. "Systems Architecture Design Pattern Catalog for Developing Digital Twins." Sensors 20, no. 18 (2020): 5103. http://dx.doi.org/10.3390/s20185103.

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A digital twin is a digital replica of a physical entity to which it is remotely connected. A digital twin can provide a rich representation of the corresponding physical entity and enables sophisticated control for various purposes. Although the concept of the digital twin is largely known, designing digital twins based systems has not yet been fully explored. In practice, digital twins can be applied in different ways leading to different architectural designs. To guide the architecture design process, we provide a pattern-oriented approach for architecting digital twin-based systems. To thi

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Lippert, Kari J., and Robert Cloutier. "Cyberspace: A Digital Ecosystem." Systems 9, no. 3 (2021): 48. http://dx.doi.org/10.3390/systems9030048.

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Cyberspace is a new frontier, not just for hackers, but for engineers. It is a digital ecosystem, the next generation of Internet and network applications, promising a whole new world of distributed and open systems that can interact, self-organize, evolve, and adapt. These ecosystems transcend traditional collaborative environments, such as client-server, peer-to-peer, or hybrid models (e.g., web services), to become a self-organized, evolving, interactive environment. Understanding cyberspace as a system is critical if we are to properly design systems to exist within it. Considering it to b

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Kao, C. K., A. Sinha, and A. K. Mahalanabis. "A Digital Algorithm for Near-Minimum-Time Control of Robot Manipulators." Journal of Dynamic Systems, Measurement, and Control 109, no. 4 (1987): 320–27. http://dx.doi.org/10.1115/1.3143861.

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A digital state feedback control algorithm has been developed to obtain the near-minimum-time trajectory for the end-effector of a robot manipulator. In this algorithm, the poles of the linearized closed loop system are judiciously placed in the Z-plane to permit near-minimum-time response without violating the constraints on the actuator torques. The validity of this algorithm has been established using numerical simulations. A three-link manipulator is chosen for this purpose and the results are discussed for three different combinations of initial and final states.

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Dickinson, Benjamin, and Daniel Wilkinson. "Securing industrial systems in a digital world." APPEA Journal 59, no. 2 (2019): 574. http://dx.doi.org/10.1071/aj18264.

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Operational technology, largely industrial equipment, has become increasingly connected, and the integration of information technology components allows such devices to leverage software that drives data collection and analysis, resulting in enhanced performance and ultimately ‘smarter’ machines. With these benefits come vulnerabilities, including the possibility of malicious actors gaining access to critical assets through networks. The growing recognition of cybersecurity threats to critical infrastructure (e.g. oil, gas, chemicals, energy, water) has brought the topic into the spotlight. Fu

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Rober, S. J., Y. C. Shin, and O. D. I. Nwokah. "A Digital Robust Controller for Cutting Force Control in the End Milling Process." Journal of Dynamic Systems, Measurement, and Control 119, no. 2 (1997): 146–52. http://dx.doi.org/10.1115/1.2801226.

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In this work, a digital robust controller is designed via Quantitative Feedback Theory (QFT) to maintain a constant cutting force in the presence of parametric uncertainty for a time varying end milling process. The QFT controller is designed using the delta transform method for discrete systems. The controller is designed to limit the overshoot and settling time of the cutting force levels over a range of cutting parameters. Models are presented for the cutting process and machine dynamics including parametric uncertainty, and these models are used to develop a controller which meets given tr

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Lechner, Michael, Tassilo Christ, Philipp Frey, et al. "Blockchain in der Blechverarbeitung/Blockchain in sheet metal processing." wt Werkstattstechnik online 110, no. 10 (2020): 704–8. http://dx.doi.org/10.37544/1436-4980-2020-10-60.

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Die Verfolgung von Bauteilen und Zwischenprodukten sowie die Erfassung eines vollständigen Produktionsdatensatzes sind in modernen Fertigungsketten eine wichtige Voraussetzung für die durchgängig digitale Produktion. Dieser Beitrag stellt die Lösung dieser Herausforderungen durch die Kombination zweier Systeme vor: Während eine blockchain-basierte Austauschplattform die Einhaltung der Anforderungen an die prozessübergreifende Vernetzung sicherstellt, kommt eine optische Technologie für die markierungsfreie Bauteilidentifizierung zum Einsatz. &nbsp; The ability to both track physical produc

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Völkl, E., L. F. Allard, T. A. Nolan, D. Hill, and M. Lehmann. "A Simple and Inexpensive Route to Remote Electron Microscopy." Proceedings, annual meeting, Electron Microscopy Society of America 54 (August 11, 1996): 386–87. http://dx.doi.org/10.1017/s0424820100164398.

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Due to the availability of fast computer networks such as Ethernet, FDDI and ATM, the idea of Telemicroscopy, including running electron microscopes from remote locations has gained momentum. Fan, Ellisman, Zaluzec and Parvin, have discussed aspects of systems which support such capabilities. In each of these reports the authors describe new stand-alone software packages that are required to run their systems. In order to make remote microscopy more universally available, we have chosen to expand de facto standard commercial software to provide for computerized microscope control and remote co

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Yaron, Yaron, Eran Keinan, Moshe Benhamu, Ronen Regev, and Garry Zalmanzon. "NATIONAL GUIDELINES FOR DIGITAL CAMERA SYSTEMS CERTIFICATION." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 3, 2016): 179–84. http://dx.doi.org/10.5194/isprsarchives-xli-b1-179-2016.

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Digital camera systems are a key component in the production of reliable, geometrically accurate, high-resolution geospatial products. These systems have replaced film imaging in photogrammetric data capturing. Today, we see a proliferation of imaging sensors collecting photographs in different ground resolutions, spectral bands, swath sizes, radiometric characteristics, accuracies and carried on different mobile platforms. In addition, these imaging sensors are combined with navigational tools (such as GPS and IMU), active sensors such as laser scanning and powerful processing tools to obtain

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Yaron, Yaron, Eran Keinan, Moshe Benhamu, Ronen Regev, and Garry Zalmanzon. "NATIONAL GUIDELINES FOR DIGITAL CAMERA SYSTEMS CERTIFICATION." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 3, 2016): 179–84. http://dx.doi.org/10.5194/isprs-archives-xli-b1-179-2016.

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Digital camera systems are a key component in the production of reliable, geometrically accurate, high-resolution geospatial products. These systems have replaced film imaging in photogrammetric data capturing. Today, we see a proliferation of imaging sensors collecting photographs in different ground resolutions, spectral bands, swath sizes, radiometric characteristics, accuracies and carried on different mobile platforms. In addition, these imaging sensors are combined with navigational tools (such as GPS and IMU), active sensors such as laser scanning and powerful processing tools to obtain

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Méndez-Ramírez, Rodrigo, Adrian Arellano-Delgado, Miguel Murillo-Escobar, and César Cruz-Hernández. "Degradation Analysis of Chaotic Systems and their Digital Implementation in Embedded Systems." Complexity 2019 (December 4, 2019): 1–22. http://dx.doi.org/10.1155/2019/9863982.

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Digital implementation of chaotic systems (CSs) has attracted increasing attention from researchers due to several applications in engineering, e.g., in areas as cryptography and autonomous mobile robots, where the properties of chaotic systems are strongly related. The CSs in the continuous version (CV) need to be discretized where chaotic degradation must be analyzed to guarantee preservation of chaos. In this paper, we present a degradation analysis of five three-dimensional CSs and the necessary conditions to implement the discretized versions (DVs) of Lorenz, Rössler, Chen, Liu and Chen,

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Karimov, Timur, Denis Butusov, Valery Andreev, Artur Karimov, and Aleksandra Tutueva. "Accurate Synchronization of Digital and Analog Chaotic Systems by Parameters Re-Identification." Electronics 7, no. 7 (2018): 123. http://dx.doi.org/10.3390/electronics7070123.

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The verification of the digital models of chaotic systems and processes is a valuable problem in many practical applications, such as nonlinear control and communications. In our study, we propose a hybrid technique for chaotic systems’ identification, based on the chaotic synchronization of digital and analog counterparts and a numerical optimization method used for the fine tuning of parameters. An analog circuit implementing the Rössler oscillator with digitally controlled parameters was chosen as an identification object, and the FPGA model was used as a digital counterpart for coupling an

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Cohan, Steve. "Trends in ROV Development." Marine Technology Society Journal 42, no. 1 (2008): 38–43. http://dx.doi.org/10.4031/002533208786861335.

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This paper describes three new directions in the development of ROV control systems: exploiting the capabilities of digital video, using model-based control techniques for ROV operations, and providing ROV systems with sophisticated remote diagnostics. Goals of these trends are to increase the value of ROV operations end products (such as video), to increase efficiency of operations by adding automation, and to increase productive time by bringing outside resources to the ROV for maintenance and troubleshooting.Advances in digital video can enhance the value of video imagery by facilitating th

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El-Shafei, A., and J. P. Hathout. "Modeling and Control of HSFDs for Active Control of Rotor-Bearing Systems." Journal of Engineering for Gas Turbines and Power 117, no. 4 (1995): 757–66. http://dx.doi.org/10.1115/1.2815462.

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This paper summarizes the development of hybrid squeeze film dampers (HSFDs) for active control of rotor vibrations. Previously, it was shown both theoretically and experimentally that HSFDs can be used for controlling rotor vibrations (El-Shafei, 1993). This is done by controlling the flow in a squeeze film damper through movable end seals, thus achieving the ability to change the damper from a short damper to a long damper and vice versa. However, the control of the HSFD was manual. In this paper, an automatically controlled circuit is developed for the HSFD, incorporating a pressure control

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Yabanova, İsmail. "Digital Signal Processing–based Dynamic Mass Measurement System for Egg Weighing Process." Measurement and Control 50, no. 4 (2017): 97–102. http://dx.doi.org/10.1177/0020294017713768.

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In this study, an electronic, mechanical and software system, where the weight measurements of eggs can be performed dynamically, is developed. As the speed is an important factor in the production sector, it is of significant importance that the manufactured products be weighed in a rapid and correct manner. For this reason, systems where the products are dynamically weighed are developed. However, as the products are weighed while they are moving in dynamic weighing systems, undesired disturbing effects occur on the measurement signal. The product weights must be measured at required speeds

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Yang, Wen Yang, Liu Mei Zhang, Shao Wei Pan, and Zhi Xuan Fan. "Interactive Digital Campus Visual Navigation System Design and Development." Applied Mechanics and Materials 336-338 (July 2013): 1422–25. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.1422.

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Designing an interactive virtual navigation system needs consideration of compositive features such as modelling, movement control and object selection. Those features are key to meet end user requirements. Current virtual navigation systems are not beneficial to popularize in the case of development environment, methods and technologies. That is because such systems have limited application area and costs. Proprietary development environment result in limited selection in system components while new development technologies are unlikely to be accepted as staggering capital costs. In this pape

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Giudicianni, Carlo, Manuel Herrera, Armando di Nardo, Kemi Adeyeye, and Helena M. Ramos. "Overview of Energy Management and Leakage Control Systems for Smart Water Grids and Digital Water." Modelling 1, no. 2 (2020): 134–55. http://dx.doi.org/10.3390/modelling1020009.

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Current and future smart cities are moving towards the zero-net energy use concept. To this end, the built environment should also be designed for efficient energy use and play a significant role in the production of such energy. At present, this is achieved by focusing on energy demand in buildings and to the renewable trade-off related to smart power grids. However, urban water distribution systems constantly carry an excess of hydraulic energy that can potentially be recovered to produce electricity. This paper presents a comprehensive review of current strategies for energy production by r

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Heithecker, Sven, Amilcar do Carmo Lucas, and Rolf Ernst. "A High-End Real-Time Digital Film Processing Reconfigurable Platform." EURASIP Journal on Embedded Systems 2007 (2007): 1–15. http://dx.doi.org/10.1155/2007/85318.

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Westkämper, E., J. Niemann, and M. Stolz. "Digital information—potentials for TeleX applications." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 216, no. 5 (2002): 801–8. http://dx.doi.org/10.1243/0954405021520319.

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The paper describes how the application of new information and communication technologies in manufacturing systems and technical consumer goods gives companies the possibility to create added value services in the usage phase, e.g. through remote operations or virtual facility management. In this regard, a communication platform for a digital factory has been developed to make diagnoses of the machine, program changes or process optimizations possible in less time by using an integrated control system, visualization and surveillance. The precise reproduction of the production system in a virtu

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HILERA, JOSE R., VICTOR J. MARTÍNEZ, and MANUEL MAZO. "ECG SIGNALS PROCESSING WITH NEURAL NETWORKS." International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 03, no. 04 (1995): 419–30. http://dx.doi.org/10.1142/s0218488595000219.

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Nowadays, the digital register process of electrocardiographical signals (ECG) constitutes a common practice for the diagnosis and controlling of patients suffering from cardiac disorders. In this paper we study the usefulness of Artificial Neural Network (ANN) for clinical diagnosis through the detection of arrythmias and the reduction of the large spaces occupied by ECG records.

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Lima, Kollins Gabriel, and Maximiliam Luppe. "Restructuring the Digital Systems Laboratory in Computer Engineering Course." International Journal on Alive Engineering Education 5, no. 1 (2018): 51. http://dx.doi.org/10.5216/ijaeedu.v5i1.50482.

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It's not difficult to find students of Computer Engineering, at the University of São Paulo, in São Carlos School of Engineering, complaining about the way that practical classes are given during the graduation. What is said is that these classes only reproduce results already seen in theory classes, that they are limited by a laboratory script and, at the end, nothing new is added to their knowledge, making them a little bit frustrated about the classes. In this paper, it's shown how PBL (Problem-based Learning) was used in Digital Systems Laboratory, a 4-semester discipline, to start a chang

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Awan and Al Ghamdi. "Understanding the Vulnerabilities in Digital Components of An Integrated Bridge System (IBS)." Journal of Marine Science and Engineering 7, no. 10 (2019): 350. http://dx.doi.org/10.3390/jmse7100350.

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The adoption of the global positioning system (GPS) within the marine industry has revolutionized the marine operations by condensing the navigation of a vessel into an integrated bridge system (IBS). An IBS acts as the main command and control of a vessel as it interconnects various digital devices used for navigation in open seas and is also connected to other on-board systems of a vessel e.g., navigation and control, propulsion and machinery management system, cargo management system and safety management system, core infra structure systems, administrative and crew welfare systems, etc. Ad

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Li, Peng, Wei Xi, Xianggen Yin, Hao Yao, and Huafeng Chen. "Design of a CMOS Lineal Hall Sensor Front-End Working in Current Mode with Programmable Gain Stage for Power Specific Chip." Journal of Sensors 2021 (February 1, 2021): 1–5. http://dx.doi.org/10.1155/2021/6618206.

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With the continuous intelligentization of power systems, the demand for the integration of digital chips and sensor chips such as the Internet of Things is also increasing. A CMOS lineal magnetic Hall sensor front-end working in current mode with programmable gain stage is designed and implemented with SMIC 55 nm standard CMOS technology. By using a spinning-current technique, chopper technique, and digital calibration technique to eliminate the offset voltage and nonlinearity, this magnetic Hall sensor can be easily integrated into digital systems like SoCs. This work has already finished the

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Anisimov, Mykola. "Historical aspects of development of digital systems in Ukraine." Academic Notes Series Pedagogical Science 1, no. 189 (2020): 10–13. http://dx.doi.org/10.36550/2415-7988-2020-1-189-10-13.

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In article the made attempt to tell about some scientific schools in the field of digital electronic computer facilities in days of its formation. It is necessary to note results of huge self-denying work of collectives scientific and operated them on maintenance with computer facilities of space researches, atomic engineering, rocket production, the first class systems of supervision over space, antimissile і antiaircraft defence. Necessity of the additional information at studying of such disciplines as: «Computer science», «the Engineering and computer drawing», «Metrology», «Standardizatio

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Salinas, R., U. Raff, and L. A. Henríquez-Vargas. "Digital Temperature Tracking in Porous Media Burners." Measurement and Control 45, no. 3 (2012): 90–93. http://dx.doi.org/10.1177/002029401204500305.

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Combustion in porous media burners presents considerable advantages over free flame burners due to several outstanding features inter alia clean and highly efficient combustion properties allowing a considerable amount of feedback energy from the flame area to preheat the mixture of fuel and air resulting in a considerable reduction of unavoidable pollutant formations appearing e.g. as the emission of CO and NOX. In addition, porous media burners are manufactured in highly compact small sizes suitable to industrial and household heating characteristic applications. Heat transfer between solid

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Shen, Fei, Shuang Shuang Ren, Xiang Yang Zhang, Hong Wu Luo, and Chao Min Feng. "A Digital Twin-Based Approach for Optimization and Prediction of Oil and Gas Production." Mathematical Problems in Engineering 2021 (September 3, 2021): 1–8. http://dx.doi.org/10.1155/2021/3062841.

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The Internet of things technology plays an important role in improving the efficiency of oil and gas production, of which digital twin technology is the most prominent. By effectively using data and organically combining them with a deep understanding of technicians, digital twin technology can improve the efficiency of oil and gas asset systems in the entire life cycle of an oilfield including design, operation control, optimization, etc. Starting with the concept of digital twinning, this paper analyzes the situation of digital twinning in various industries, then obtains the new connotation

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Michaeli, Linus, and Ján Šaliga. "Error Models of the Analog to Digital Converters." Measurement Science Review 14, no. 2 (2014): 62–77. http://dx.doi.org/10.2478/msr-2014-0010.

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Abstract Error models of the Analog to Digital Converters describe metrological properties of the signal conversion from analog to digital domain in a concise form using few dominant error parameters. Knowledge of the error models allows the end user to provide fast testing in the crucial points of the full input signal range and to use identified error models for post correction in the digital domain. The imperfections of the internal ADC structure determine the error characteristics represented by the nonlinearities as a function of the output code. Progress in the microelectronics and missi

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Zheng, Hanzhong, Simin Yu, and Jinhu Lü. "Design and ARM Platform-Based Realization of Digital Color Image Encryption and Decryption via Single State Variable Feedback Control." International Journal of Bifurcation and Chaos 24, no. 04 (2014): 1450049. http://dx.doi.org/10.1142/s0218127414500497.

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In this paper, discrete-time chaotic systems under single state variable feedback control are studied, and drive-response synchronization is investigated. To that end, ARM platform-based digital color image encryption and decryption using a chaotic stream cipher is designed and implemented, with experimental results demonstrated.

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Kim, Eunju, Seokhoon Kang, and Sangsoon Lee. "RS485 Image Sensor for Digital Cinema System." Journal of Sensors 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/9721820.

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To activate various devices using RS485, a repeater is generally used. In current digital cinema systems, each device is controlled with RS485 by mixing RS485 and DMX512. However, as today’s cinema equips hundreds of 4D chairs and the environmental directors, it is nearly infeasible for the legacy system to control. To this end, this paper designs and implements a new system which makes hundreds of 4D chairs and the environmental directors be controlled simultaneously exploiting RS485 network topology and its repeaters. The proposed approach is tested in a real-time system for assessing the pe

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Dmitrievskiy, Anatoliy N., Nikolay A. Eremin, Dina S. Filippova, and Elizaveta A. Safarova. "Digital oil and gas complex of Russia." Georesursy, Special issue (August 31, 2020): 32–35. http://dx.doi.org/10.18599/grs.2020.si.32-35.

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Digital and technological modernization of the oil and gas industry through the use of innovative technologies and platform solutions, intelligent control systems, domestic “end-to-end” digital technologies will help strengthen Russia’s position in the global oil and gas market. One of the megascience projects being developed at the Institute of Oil and Gas Research Institute of the Russian Academy of Sciences is the creation of a Geosphere Observatory. The Geosphere Observatory is focused on studying the influence of fundamental geological processes (crustal waveguides, fracture centers, etc.

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Brom, Frans W. A., and Michiel Besters. "‘Greedy’ Information Technology: The Digitalization of the European Migration Policy." European Journal of Migration and Law 12, no. 4 (2010): 455–70. http://dx.doi.org/10.1163/157181610x535782.

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AbstractEuropean borders are being transformed into digital borders. The ambition behind the European information systems ‐ like the Schengen Information System and Eurodac ‐ is to establish a single Union information system to control the flux of migrants. We show that in this process information technology is not a neutral tool to reach established goals but that it is ‘greedy’. This greediness indicates the distorting potential of information technology regarding the means-end logic. Our analysis suggests that the European migration policy is stuck in a ‘digital fix’, i.e. a technological f

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Hainfeld, James F., and Keith L. Monson. "An integrated computer system for STEM data acquisition and processing." Proceedings, annual meeting, Electron Microscopy Society of America 44 (August 1986): 874–75. http://dx.doi.org/10.1017/s0424820100145716.

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Several laboratories have reported digital data acquisition and control systems for electron microscopes. The considerations involved in implementation of such a system have been reviewed. All of these systems have used a relatively small minicomputer, either as a stand-alone, or as a satellite processor linked to a larger computer, so as not to burden the large host with the mundane task of operating a microscope. In recent years however, hardware costs have decreased sufficiently that many laboratories have their own superminicomputer (e.g., one of the Digital VAX series), or share one withi

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BEZBORODOV, Y. G., N. N. KHOZHANOV, and Z. S. AUGANBAEVA. "ENERGY PRINCIPLES FOR DETERMINING THE IRRIGATION RATE OF AGRICULTURAL CROPS." Prirodoobustrojstvo, no. 3 (2021): 13–20. http://dx.doi.org/10.26897/1997-6011-2021-3-13-20.

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Purpose: increasing the resource potential of objects of reclamation systems by developing a digitalization mechanism and an expert system for managing the efficiency of operation. An algorithm for the formation of the digital identity of individual reclamation systems is proposed, which presents the process of solving the logical problem of assessing the residual resource of individual objects of the reclamation system. The characteristics of the parameters of reclamation objects included in the Database of the expert system, focused on the creation of a flexible platform in the cloud environ

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Kiravuo, Timo, Seppo Tiilikainen, Mikko Särelä, and Jukka Manner. "A White Hat Study of a Nation's Publicly Accessible Critical Digital Infrastructure and a Way Forward." International Journal of Cyber Warfare and Terrorism 6, no. 1 (2016): 41–52. http://dx.doi.org/10.4018/ijcwt.2016010104.

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The developed society depends on many critical infrastructure processes, such as power generation, water treatment, many types of manufacturing, and smart buildings. These processes need control and the automation industry has embraced the Internet to connect all these controls. However, the controlling devices thus opened to the world do not always have adequate safeguards to withstand malicious users. Many automation systems have default passwords or known and unknown backdoors. Also, often those systems are not updated to close security weaknesses found after original installation. The auth

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Admassu, Yonathan. "Digital Surface Model-aided Quantitative Geologic Rockfall Rating System (QG-RRS)." Environmental and Engineering Geoscience 25, no. 4 (2019): 255–71. http://dx.doi.org/10.2113/eeg-2102.

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ABSTRACT Rockfalls are one of the most common types of slope failures that affect cut slopes along roadways in mountainous regions. The Rockfall Hazard Rating System (RHRS), started in Oregon and adopted by various U.S. states, is used to rate cut slopes with respect to their likelihood of releasing rockfalls. Existing rating systems use semi-quantitative approaches to rate geological and non-geological factors. The main geologic factors are favorability/unfavorability of orientation of discontinuities with respect to the orientation of slope faces and likelihood of differential weathering lea

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Wang, Yihang, Qiang Fu, Yufeng Zhang, et al. "A Digital Closed-Loop Sense MEMS Disk Resonator Gyroscope Circuit Design Based on Integrated Analog Front-end." Sensors 20, no. 3 (2020): 687. http://dx.doi.org/10.3390/s20030687.

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A digital closed-loop system design of a microelectromechanical systems (MEMS) disk resonator gyroscope (DRG) is proposed in this paper. Vibration models with non-ideal factors are provided based on the structure characteristics and operation mode of the sensing element. The DRG operates in force balance mode with four control loops. A closed self-excited loop realizes stable vibration amplitude on the basis of peak detection technology and phase control loop. Force-to-rebalance technology is employed for the closed sense loop. A high-frequency carrier loaded on an anchor weakens the effect of

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Kutsikos, Konstadinos, Nikolaos Konstantopoulos, Damianos Sakas, and Yiannis Verginadis. "Developing and managing digital service ecosystems: a service science viewpoint." Journal of Systems and Information Technology 16, no. 3 (2014): 233–48. http://dx.doi.org/10.1108/jsit-02-2014-0015.

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Purpose – The need for modern enterprises to seamlessly interoperate poses significant challenges on their capabilities for engaging in multiple business networks. This paper considers a particular type of business network, namely, “service ecosystems”, and proposes architecture for enabling business firms to: control dissemination and usage of the resources they contribute to the ecosystem; and develop corresponding service offerings. Design/methodology/approach – A literature review informed our research work and contextualized the development of relevant research questions. The research que

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Xia, Jack Zhijie, and Chia-Hsiang Menq. "Real Time Estimation of Elastic Deformation for End-Point Tracking Control of Flexible Two-Link Manipulators." Journal of Dynamic Systems, Measurement, and Control 115, no. 3 (1993): 385–93. http://dx.doi.org/10.1115/1.2899114.

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In this paper, an elastic-deformation estimator is proposed for real time end-point tracking control of a flexible two-link manipulator. Due to the noncolocated characteristics of the system, the inverse model (from end-point motion to control torques) is divided into two subsystems, namely, the stable subsystem and the unstable one, corresponding to the causal part and noncausal part of the system’s elastic motion, respectively. A digital filter is formulated to replace the unstable subsystem so as to estimate the noncausal part of the elastic motion associated with a specified end-point moti

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Wilson, John P., William P. Inskeep, Paul R. Rubright, Diana Cooksey, Jeffrey S. Jacobsen, and Robert D. Snyder. "Coupling Geographic Information Systems and Models for Weed Control and Groundwater Protection." Weed Technology 7, no. 1 (1993): 255–64. http://dx.doi.org/10.1017/s0890037x00037234.

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The Chemical Movement through Layered Soils (CMLS) model was modified and combined with the USDA-SCS State Soil Geographic Data Base (STATSGO) and Montana Agricultural Potentials System (MAPS) digital databases to assess the likelihood of groundwater contamination from selected herbicides in Teton County, MT. The STATSGO and MAPS databases were overlaid to produce polygons with unique soil and climate characteristics and attribute tables containing only those data needed by the CMLS model. The Weather Generator (WGEN) computer simulation model was modified and used to generate daily precipitat

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SEVRYUGINA, N. S., A. S. APATENKO, and P. D. KAPYRIN. "RECLAMATION SYSTEMS AND DIGITAL IDENTITY AS A MECHANISM OF RESOURCE MANAGEMENT." Prirodoobustrojstvo, no. 3 (2021): 6–13. http://dx.doi.org/10.26897/1997-6011-2021-3-6-13.

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The purpose of the study is to establish an analytical relationship between the irrigation norm and the sum of positive temperatures which will allow optimizing and rationalizing the use of natural resource potential without affecting the productivity of forage crops. There is established that the dynamics of soil moisture during the vegetation season on the meadow-alluvial soils of the Aral Sea region and sierozem soils of the south of Kazakhstan with the sum of positive temperatures is greater than 10°C.To justify the period of vegetation irrigation according to the indicators of the sum of

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Kumar, Umesh. "A Retrospection of Chaotic Phenomena in Electrical Systems." Active and Passive Electronic Components 21, no. 1 (1998): 1–15. http://dx.doi.org/10.1155/1998/32462.

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In the last decade new phenomena have been observed in all areas of non linear dynamics, principal among these being ‘Chaotic phenomena’. Chaos has been reported virtually from every scientific discipline. This paper summarizes a study of the chaotic phenomena in electrical systems and attempts to translate the mathematical ideas and techniques into language that engineers and applied scientists can use to study ‘Chaos’. Towards this end, the paper has summarized the study of chaos in several examples like Chua’s circuit family; Folded Torus circuit; non-autonomous circuits; switched capacitor

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Sovilj, P., M. Milovanović, D. Pejić, M. Urekar, and Z. Mitrović. "Influence of Wilbraham-Gibbs Phenomenon on Digital Stochastic Measurement of EEG Signal Over an Interval." Measurement Science Review 14, no. 5 (2014): 270–78. http://dx.doi.org/10.2478/msr-2014-0037.

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Abstract Measurement methods, based on the approach named Digital Stochastic Measurement, have been introduced, and several prototype and small-series commercial instruments have been developed based on these methods. These methods have been mostly investigated for various types of stationary signals, but also for non-stationary signals. This paper presents, analyzes and discusses digital stochastic measurement of electroencephalography (EEG) signal in the time domain, emphasizing the problem of influence of the Wilbraham-Gibbs phenomenon. The increase of measurement error, related to the Wilb

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Yamakawa, Daiki, Takashi Okimoto, Songpon Teerakanok, Atsuo Inomata, and Tetsutaro Uehara. "Enhancing Digital Certificate Usability in Long Lifespan IoT Devices by Utilizing Private CA." Security and Communication Networks 2021 (February 16, 2021): 1–14. http://dx.doi.org/10.1155/2021/6610863.

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Today, smart devices and services have become a part of our daily life. These devices and services offer a richer user experience with a much higher quality of services than before. Many of them utilize sensing functions via cloud architecture to perform remote device controls and monitoring. Generally, the security of the communication between these devices and the service provider (e.g., cloud server) is achieved by using the TLS protocol via PKI standard. In this study, we investigate the risk associating with the use of public certificate authorities (CAs) in a PKI-based IoT system. An exp

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Birch, Kean, DT Cochrane, and Callum Ward. "Data as asset? The measurement, governance, and valuation of digital personal data by Big Tech." Big Data & Society 8, no. 1 (2021): 205395172110173. http://dx.doi.org/10.1177/20539517211017308.

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Digital personal data is increasingly framed as the basis of contemporary economies, representing an important new asset class. Control over these data assets seems to explain the emergence and dominance of so-called “Big Tech” firms, consisting of Apple, Microsoft, Amazon, Google/Alphabet, and Facebook. These US-based firms are some of the largest in the world by market capitalization, a position that they retain despite growing policy and public condemnation—or “techlash”—of their market power based on their monopolistic control of personal data. We analyse the transformation of personal dat

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Aggarwal, Parag, and Vivek Ashok Bohara. "End-to-End Theoretical Evaluation of a Nonlinear MIMO-OFDM System in the Presence of Digital Predistorter." IEEE Systems Journal 13, no. 3 (2019): 2309–19. http://dx.doi.org/10.1109/jsyst.2018.2872609.

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