Academic literature on the topic '220404 Computer systems'

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Journal articles on the topic "220404 Computer systems"

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Alsubaiy, Ebrahim Fihaid. "Micro-CT analysis of 3D printed provisional crowns fitting." Technology and Health Care, August 25, 2022, 1–10. http://dx.doi.org/10.3233/thc-220304.

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BACKGROUND: The provisional crowns (PR) play an important role during the course of fixed prosthesis treatment. The fitting of PR varies and depends on various factors. OBJECTIVE: The aim of the study was to evaluate the marginal and internal fit of PR produced by three-dimensional (3D) printing technique and to compare those with PR made by the milling technique by using micro computed tomography (μCT) on three commonly used finish line designs. METHOD: Ninety study models were made using metal die of #14 tooth (i.e. maxillary 1st premolar molar) prepared for full veneer crown with three different finish line chamfer (C), rounded shoulder (RS) and rounded shoulder with bevel (RSB). PR was fabricated on each study model, using milling (MiL group, n= 45), and 3D printing technique (3D-P group, n= 45). Marginal and internal fit of each study model was measured by micro computed tomography, at 7 Zones Pr-1- Pr-7 on each finish line. Recorded data were statistically analysed by one-way analysis of variance (ANOVA) and using Dunnett t-Test (p> 0.05). RESULTS: The mean gap at margins was minimum for provisional crowns in 3D-P group in any finish line with minimum in rounded shoulder with bevel at zone Pr-1 30.9 ± 5.3 and at zone Pr-7 32.7 ± 5.3. In the axial region, i.e. zone Pr-2, the smallest gap was recorded in the 3D-P group and in the occlusal region, for zone Pr-3, 4 and 5, the maximum gap was recorded in the MiL group. CONCLUSION: The provisional crowns fabricated by 3D printed technique have better marginal and internal fit than the provisional crowns made by milling technique.
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Jiang, Youhua, Ke Li, Yilong Cao, Le Zhao, and Xiangwei Jiang. "Sub-synchronous oscillation suppression in MMC-HVDC grid-connected systems under wind farm fluctuation scenarios." Journal of Computational Methods in Sciences and Engineering, October 17, 2022, 1–17. http://dx.doi.org/10.3233/jcm-220464.

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In order to solve the problem of sub-synchronous oscillation (SSO) of wind power grid-connected system with modular multilevel converter based on high voltage direct current transmission (MMC-HVDC), which is characterized by frequency drift due to the fluctuation of wind power output and the dynamic interaction of MMC. By considering the coupling characteristics of wind power volatility and the internal harmonic dynamics of MMC, we establish a small-signal model of the interconnection system between the equivalent wind farm and MMC-HVDC, study the dominant factors triggering the system oscillation, and use model predictive control (MPC). The results show that the wind farm output, wind farm terminal voltage and terminal current are the dominant factors leading to SSO frequency drift; It is also verified that the MPC-SSDC control not only effectively suppresses SSOs with single frequency drift, but is effective when multiple SSOs with different frequencies exist simultaneously. It is shown that MPC-SSDC can self-adapt to the multi-oscillation scenario of wind power grid-connected system to provide frequency and damping support for the system.
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Malas, Anas, Salah El Falou, Mohamad El Falou, and Mohammad Hussein. "A multi-agent approach for on-demand transportation problem in cities." Web Intelligence, August 9, 2022, 1–15. http://dx.doi.org/10.3233/web-220004.

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On-demand transportation (ODT) systems have proliferated in diverse cities worldwide due to their social, economic and environmental advantages. Despite those advantages, it is vital to get public approval. The approval key is the system’s reactivity in supplying speedy and reliable solutions that consider clients’ and vehicles’ constraints. Those solutions have to reflect actual life conditions to optimize the quality of service. The most regarded challenge in studying the ODT problem in cities is the stochastic time-dependent travel speed that varies due to traffic fluctuations. To deal with an actual ODT problem, a system has to represent the traffic on its scale. Hence, estimating the travel speed at a specific time and affording a solution based on reliable traffic data. Accordingly, the passengers are served better. This work contributes to the study by solving the ODT problem in cities with a massive multi-agent system that considers historical traffic data and unpredictable events disrupting the typical traffic. We evaluate the proposed approach by experiments with instances based on actual data for a city in the north of Lebanon. The results reveal that the quality of service increases when the stochastic time-dependent travel speed is considered. 50% to 100% of affected clients by an unpredictable event are satisfied when this event is considered by the system.
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Books on the topic "220404 Computer systems"

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Mike Meyers Comptia A Guide To Managing And Troubleshooting Operating Systems Exam 220802. McGraw-Hill/Osborne Media, 2012.

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Institute, SAS, ed. Changes and enhancements to System 2000 software, release 5.0 for Unisys 1100 and 2200 series computers. Austin, Tex: SAS Institute Inc., 1989.

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Book chapters on the topic "220404 Computer systems"

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Urano, Masahiro, Yasushi Ikei, Koichi Hirota, and Tomohiro Amemiya. "FiveStar: Ultra-Realistic Space Experience System." In Lecture Notes in Computer Science, 407–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22024-1_45.

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San Martin, Jose. "Study of Optimal Behavior in Complex Virtual Training Systems." In Lecture Notes in Computer Science, 64–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22024-1_8.

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Yu, Wenhui, Catherine Vuong, and Todd Ingalls. "An Interactive Multimedia System for Parkinson’s Patient Rehabilitation." In Lecture Notes in Computer Science, 129–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22024-1_15.

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Kawamoto, Shin-ichi, Tatsuo Yotsukura, Satoshi Nakamura, and Shigeo Morishima. "Personalized Voice Assignment Techniques for Synchronized Scenario Speech Output in Entertainment Systems." In Lecture Notes in Computer Science, 177–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22024-1_20.

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Hiyama, Atsushi, Yusuke Doyama, Mariko Miyashita, Eikan Ebuchi, Masazumi Seki, and Michitaka Hirose. "Wearable Display System for Handing Down Intangible Cultural Heritage." In Lecture Notes in Computer Science, 158–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22024-1_18.

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Morishima, Shigeo, Yasushi Yagi, and Satoshi Nakamura. "Instant Movie Casting with Personality: Dive into the Movie System." In Lecture Notes in Computer Science, 187–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22024-1_21.

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Hirota, Koichi, Seichiro Ebisawa, Tomohiro Amemiya, and Yasushi Ikei. "A System for Creating the Content for a Multi-sensory Theater." In Lecture Notes in Computer Science, 151–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22024-1_17.

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Gardo, Krzysztof, and Ewa Lukasik. "VClav 2.0 – System for Playing 3D Virtual Copy of a Historical Clavichord." In Lecture Notes in Computer Science, 141–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22024-1_16.

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Wakita, Wataru, Katsuhito Akahane, Masaharu Isshiki, and Hiromi T. Tanaka. "A Realtime and Direct-Touch Interaction System for the 3D Cultural Artifact Exhibition." In Lecture Notes in Computer Science, 197–205. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22024-1_22.

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Watanabe, Takafumi, Kenji Inose, Makoto Ando, Takashi Kajinami, Takuji Narumi, Tomohiro Tanikawa, and Michitaka Hirose. "Digital Display Case: A Study on the Realization of a Virtual Transportation System for a Museum Collection." In Lecture Notes in Computer Science, 206–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22024-1_23.

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Conference papers on the topic "220404 Computer systems"

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Salehi, Vahid, Jihad Taha, and Shirui Wang. "Application of Munich Agile Concept for MBSE by Means of Automated Valet Parking Functions and the 3D Environment-Data." In ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/detc2020-22040.

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Abstract In today’s complex world of development of functions for automating Driving Systems (ADS), methods, tools, systems and new approaches are necessary for a seamless application. Furthermore, it is important to apply new technics of simulation and visualization (Digital Twin) for the new ADS functions. To prototype and to test these functions in a physical manner is not only a costly and complex effort but also encounters legal and bureaucratic obstacles. The importance of simulation is very high. For that reason, this paper and corresponding research project will develop a consistent traceable System Engineering approach of autonomous driving functions and its environment based on Munich Agile Concept for Model-Based-Systems-Engineering (MBSE). MBSE is based on three important core pillar which is 1) Methods/Processes, 2) Language and 3) Systems. The purpose of the new developed Munich Agile Concept Approach is to handle the complexity over the entire ADS feature development from the system requirement definition process up to the test and validation of the system. The Munich Agile Concept contains six different levels which are System Requirement-, System Functional-, System Architecture-, System Validation-, System Test and the System-Usage-Level. For defining the first three-level, a graphical language called System Modelling Language (SysML) has been applied.
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Hazelrigg, George A., and Donald G. Saari. "Toward a Theory of Systems Engineering." In ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/detc2020-22004.

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Abstract The derivation of a theory of systems engineering has long been complicated by the fact that there is little consensus within the systems engineering community regarding precisely what systems engineering is, what systems engineers do, and what might constitute reasonable systems engineering practices. To date, attempts at theories fail to accommodate even a sizable fraction of the current systems engineering community, and they fail to present a test of validity of systems theories, analytical methods, procedures or practices. This paper presents a more theoretical and more abstract approach to the derivation of a theory of systems engineering that has the potential to accommodate a broad segment of the systems engineering community and present a validity test. It is based on a simple preference statement: “I want the best system I can get.” From this statement, it is argued that a very rich theory can be obtained. Whereas most engineering disciplines are framed around a core set of widely accepted physical laws, to the authors’ knowledge, this is the first attempt to frame an engineering discipline around a preference.
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Kaurov, B. "A NEW APPROACH TO THE CONSTRUCTION OF A HUMAN AGING SCHEME." In XIV International Scientific Conference "System Analysis in Medicine". Far Eastern Scientific Center of Physiology and Pathology of Respiration, 2020. http://dx.doi.org/10.12737/conferencearticle_5fe01d9bae6739.66243641.

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A new approach to the construction of a diagram of human aging is presented, based on the shift of emphasis from the visual display of a graph to its computer analysis. The disadvantages of the old approach and the advantages of the new one are shown. On the basis of the new approach, the graphical system “AgeMap” was created and the statistical analysis of the graph of human aging, consisting of 2200 nodes, was carried out. The prospect of further application of this system is shown.
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Cyrus, Vaclav, and Jiri Polansky. "Numerical Simulation of the Flow Pulsations Origin in Cascades of the Rear Blade Rows in a Gas Turbine Axial Compressor Using Low Calorific Fuel." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50966.

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Fatigue failure of the last three stator rows vanes (S17, EGV1 and EGV2) in the seventeen stage gas turbine axial compressor occurred in the power plant where low calorific fuel, syngas, was used. Causes of this dangerous phenomenon were flow pulsations with the frequency of 380 to 400 Hz that were found by the experimental investigation of the duty gas turbine. Mechanism of the flow unsteadiness origin was studied with the help of flow simulations in 2D stator cascade system. Three numerical experiments were carried out. The first experiment investigated the flow simulation in the stator cascades system with a steady undisturbed inlet flow with increased turbulence intensity. Obtained data did not meet the standards of the actual compressor operations. In the remaining two numerical experiments a purposely designed rotor cascade was located in front of the stator cascades. Shedding of vortex structures from the cascade profile surfaces at positive incidence angles is responsible for the flow pulsation origin. The interaction of rotor wakes / stator S17 cascade plays an important role in the investigated phenomenon, as follows from CFD data. Aerodynamic loading of both cascades is equal in the second group of numerical experiments. Computed results were in a good qualitative agreement with the experimental ones. As the flow in rotor cascade was not separated, owing to the different aerodynamic loading of rotor and stator S17 cascades, the vortices shedding in stator cascade S17 had a significantly higher frequency of f = 2200 to 2300 Hz than in other investigated cases.
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Martinez-Frias, Joel, Salvador M. Aceves, J. Ray Smith, and Harry Brandt. "Thermodynamic Analysis of Zero-Atmospheric Emissions Power Plant." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33199.

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This paper presents a thermodynamic analysis of a natural gas zero-atmospheric emissions power plant with a net electrical output of 400 MW. In this power plant, methane is combusted with oxygen in a gas generator to produce the working fluid for the turbines. The combustion produces a gas mixture composed of steam and carbon dioxide. These gases drive multiple turbines to produce electricity. The turbine discharge gases pass to a condenser where water is captured as liquid and gaseous carbon dioxide is pumped from the system. The carbon dioxide can be economically conditioned for enhanced recovery of oil, or coal-bed methane, or for sequestration in a subterranean formation. The analysis considers a complete power plant layout, including an air separation unit, compressors and intercoolers for oxygen and methane compression, a gas generator, three steam turbines, a reheater, a preheater, a condenser, and a carbon dioxide pumping system to pump the carbon dioxide to the pressure required for sequestration. The computer code is a powerful tool for estimating the efficiency of the plant, given different configurations and technologies. The efficiency of the power plant has been calculated over a wide range of conditions as a function of the two important power plant parameters of turbine inlet temperature and turbine isentropic efficiency. This simulation is based on a 400 MW electric power generating plant that uses turbines that are currently under development by a U.S. turbine manufacturer. The high-pressure turbine would operate at a temperature of 1089 K (1500 °F) with uncooled blades, the intermediate-pressure turbine would operate at 1478 K (2200 °F) with cooled blades and the low-pressure turbine would operate at 998 K (1336 °F). The corresponding turbine isentropic efficiencies for these three turbines were taken as 90, 91 and 93 percent. With these operating conditions, the zero-atmospheric emissions electric power plant has a net thermal efficiency of 46.5%. This net thermal efficiency is based on the lower heating value of methane, and includes the energy necessary for air separation and for carbon dioxide separation and sequestration.
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