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Journal articles on the topic 'Operating approach'

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Published: 28 May 2022

Last updated: 18 July 2025

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Páscoa, Carlos, and José Tribolet. "Organizational Operating Systems, an Approach." Procedia Computer Science 64 (2015): 180–87. http://dx.doi.org/10.1016/j.procs.2015.08.479.

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Stobart, R. K. "An availability approach to thermal energy recovery in vehicles." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 221, no. 9 (2007): 1107–24. http://dx.doi.org/10.1243/09544070jauto463.

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Availability is a well-established and widely recognized way of describing the work-producing potential of energy systems. A first-law analysis is helpful in setting the energy context and ensuring that energy flows balance, but it is a second-law analysis based on availability that places an upper bound on the potential work output. In this analysis a new approach to thermal management intended for vehicle propulsion is examined and developed. Starting with a simple analysis of the chemical energy flow, a realistic heat exchange performance is introduced to establish a practical architecture. Within this framework, the availability analysis shows that effective thermal efficiencies of between 25 and 30 per cent are feasible. With a spark ignition engine operating at a high load condition, and the thermal recovery system at an operating pressure of 100 bar, the maximum efficiency possible with a steady flow work-producing device is 37 per cent (with fully reversible thermodynamic processes). In a water-based thermal recovery system, work could only reasonably be produced with heat transfer from a reservoir at the saturation temperature corresponding to the operating pressure. At 100 bar the maximum efficiency would be 33 per cent. In a different mode of operation, where heat is transferred incrementally to a thermal accumulator and work produced as required, the efficiency is 32 per cent at only 20 bar operating pressure. These efficiency values apply to work production to supplement a combustion engine at any operating condition. An analysis of a reciprocating expander as the work-producing device shows substantial flexibility in operation. Control of system operating pressure is shown to be of value in that periodic adjustments enhance the availability content of the thermal reservoir. The operating pressure of a fluid power system is related to the temperature of operation, and therefore the heat transfer processes. Choice of too high a pressure leads to reduced heat transfer, and ultimately a reduction in work output. There is an optimum condition that can be selected at design time and maintained during the running of the system.

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Grau, Antoni, Yolanda Bolea, and Alberto Sanfeliu. "CAD-based Approach for Identification of UAVs." MATEC Web of Conferences 291 (2019): 01004. http://dx.doi.org/10.1051/matecconf/201929101004.

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The paper presents an approach for the identification of the parameters of an Unmanned Aerial Vehicle (UAV), specifically a quadrotor using experiments in a CAD environment. A linearized control model is proposed to create a global model that operates in all operation range. Usually, in this type of systems a linear time invariant (LTI) controller is used, and then a lineal control model around each operating point is needed to the design of the controller. In this study, a linear control model suitable in each operating point is developed and identified. This serial of LTI control model can be combined and provides a global control model. Therefore, through this global control model can be designed a global controller suitable for all the operating range.

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Sum, R. N., R. H. Campbell, and W. J. Kubitz. "An approach to operating system testing." Journal of Systems and Software 6, no. 3 (1986): 273–84. http://dx.doi.org/10.1016/0164-1212(86)90049-x.

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Zhou, Jianzhong, Benjun Jia, Xiao Chen, Hui Qin, Zhongzheng He, and Guangbiao Liu. "Identifying Efficient Operating Rules for Hydropower Reservoirs Using System Dynamics Approach—A Case Study of Three Gorges Reservoir, China." Water 11, no. 12 (2019): 2448. http://dx.doi.org/10.3390/w11122448.

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In the long-term operation of hydropower reservoirs, operating rules have been used widely to decide reservoir operation because they can help operators make an approximately optimal decision with limited runoff information. However, the problems faced by reservoir managers is how to make and select an efficient operating rule properly. This study focuses on identifying efficient and reliable operating rules for the long-term operation of hydropower reservoirs using system dynamics (SD) approach. A stochastic hydrological model of reservoir inflow time series was established and used to generate a large number of inflow scenarios. A deterministic optimization operation model of hydropower reservoirs was constructed and then resolved using dynamic programming (DP) algorithm. Simultaneously, within implicit stochastic optimization (ISO) framework, different operating rules were derived using linear fitting methods. Finally, the most efficient one of the existing operating rules was identified based on SD simulation coupled with the operating rules. The Three Gorges Reservoir (TGR) in central China was used as a case study. The results show that the SD simulation is an efficient way to simulate a complicated reservoir system using feedback and causal loops. Moreover, it can directly and efficiently guide reservoir managers to make and identify efficient operating rules for the long-term operation of hydropower reservoirs.

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Afshar, Abbas, Mahyar Shafii, and Omid Bozorg Haddad. "Optimizing multi-reservoir operation rules: an improved HBMO approach." Journal of Hydroinformatics 13, no. 1 (2010): 121–39. http://dx.doi.org/10.2166/hydro.2010.061.

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We present an improved version of Honey Bees Mating Optimization (HBMO) algorithm to develop operating rules for multi-reservoir systems. The performance of the proposed model is tested through sensitivity analysis and comparing the result with those of a real-coded Genetic Algorithm (GA) for a 60-month period single-reservoir operation problem. The improved model is subsequently employed to derive release rule and storage balancing functions which form operating policy for a multi-reservoir system along two case examples: (i) water supply and (ii) hydropower generation. The obtained operating rule curves can be used to guide the system operators in decision-making. These rule curves provide the operator with the opportunity to systematically look at the system and to make proper decisions. The obtained results showed that the optimization technique proposed in this study is capable of solving complex multi-reservoir systems operation problems. Moreover, the proposed structure properly handled the tight constraints defining the parallel reservoirs operation in such a way that all the generated solutions were feasible after a particular set of iterations. The proposed optimization algorithm of this study can be developed more in future to solve multi-modal optimization problems, and also to define operation policies for highly complex multi-reservoir systems.

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Zhao, Zhengang, Dongjie Li, Xiaoping Xu, and Dacheng Zhang. "An Adaptive Joint Operating Parameters Optimization Approach for Active Direct Methanol Fuel Cells." Energies 16, no. 5 (2023): 2167. http://dx.doi.org/10.3390/en16052167.

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The operating parameters of the active direct methanol fuel cell (DMFC) are essential factors that affect cell performance. However, it is challenging to maintain the optimal maximum output power density due to the system’s complexity, the operating conditions variation, and the correlations between those parameters. This paper proposes an adaptive joint optimization method for fuel cell operating parameters. The methods include the adaptive numerical simulation of the operation parameters and the optimization for fuel cell performance. Based on orthogonal tests, a BP neural network is used to build a performance evaluation model that can quantify the influence of the operating parameters on fuel cell performance. The optimal combination of operating parameters for the fuel cell is obtained by a whale optimization algorithm (WOA) through the evaluation model. The experimental results show that the evaluation model could respond accurately and adaptively to the cell operating conditions under different operating conditions. The optimization algorithm improves the maximum power density of the fuel cell by 8.71%.

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Boiarynova, Кateryna. "Diagnostics in the operating the development of an innovation-oriented enterprise in the process of functioning: functional-parametric approach." European Journal of Management Issues 25, no. 2 (2017): 55–63. https://doi.org/10.15421/191708.

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Purpose – to develop the methodological provisions of the functional-parametric approach to diagnostics for operating the development through the centers of responsibility of an innovation-oriented industrial enterprise in the process of functioning. Design / Method / Approach. The functional-parametric approach, methods of systematization, concretization, abstract-logical, causality and causal-consequence. are used in the research. The monographs and scientific publications, Internet resources are the information basis of the research. Findings. The author substantiate the expediency of functional-parametric approach application to diagnostics for operating the development of innovation-oriented enterprise. The interpretation of concepts of operating the development and development mode are proposed. The structure of the tasks and consequences of operating the development by the functional centers of responsibility are formed. There are proposed the methodological provisions of the functional-parametric approach to diagnostics for operating the development in the process of functioning of the innovation-oriented enterprise through the centers of responsibility, which are based on the application of indicators of the implementation level of economic functions and obtaining economic returns on the dynamics of the results of the enterprise functioning, anticipate a functional dependence between the diagnosed parameters and include the diagnostic procedures complex. Theoretical implications. The interpretation of the concepts of research is revealed, the methodological provisions of the diagnostics in the operation of the development in the process of functioning of the innovation-oriented enterprise are proposed. Practical implications. The practical result of the application of proposed approach is combination of managerial and economic diagnostics, which allows operating the development of the enterprise through the centers of responsibility Originality / Value. The originality of the research is to develop and substantiate the methodological provisions of the functional-parametric approach to diagnostics for operating the development through the centers of responsibility (provision, reproduction, expansive and innovative reproduction), corresponding to the functioning of the innovation-oriented enterprise in the development mode. Future research. The direction for further research is the formation of the mechanism of operating the development of innovation-oriented enterprises in the functioning process. Paper type: сonceptual.

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Yoon, Taeseop, Sungkyu Jang, and Junki Lee. "Key Determinants of B udg et E xecution w ith the Political Market Approach: A Case Study of Korean Local Government." GLOBAL BUSINESS FINANCE REVIEW 28, no. 3 (2023): 85–101. http://dx.doi.org/10.17549/gbfr.2023.28.3.85.

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Purpose: This study is aims to analyze relationships among population, resident income, fiscal characteristics, and operating expenses in Korean local governments through investigating factors that affect operating expenses for managing local governments. Design/methodology/approach: To examine the factors affecting operating expenses, this study utilizes research framework using key determinants of budget execution in terms of operating expenses with the political market approach. For doing so, this study conducts panel regression analysis using 226 Korean local governments' empirical data during FY2016-FY2020. Findings: Analytical results show that population and fiscal factors of local governments do not explain a size of operating expenses; moreover, it reveals that local governments with a small population and fiscal size tend to spend more operating expenses. Research limitations/implications: Tis study is initiated based on the hypothesis that decrease of population would lead to decline demands for public goods and public services, which reduce the number of public goods and public services, and it would finally cause the reduction of local governments' operating expenses. However, this study has a limitation regarding to restricting the period of data since FY2016. Originality/value: Despite the above limitation, this study reveals that population variables and fiscal variables do not explain a size of operating expenses of Korean local governments. Rather, the analytical result shows that local governments with a small population and fiscal size spend more operating expenses. Therefore, this study suggests that it pays more attention to improving efficiency of organizational operation of local governments in the future.

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Nicol, John R., Gordon S. Blair, and Jonathan Walpole. "Operating system design: towards a holistic approach?" ACM SIGOPS Operating Systems Review 21, no. 1 (1987): 11–19. http://dx.doi.org/10.1145/24592.24595.

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Albataineh, Jehad, Yasser Salem, and Muhammad Jaffar. "Preventing Operating Room Fire: An Alternate Approach." Anesthesia & Analgesia 103, no. 4 (2006): 1051–52. http://dx.doi.org/10.1213/01.ane.0000239046.68083.05.

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Lampotang, Samsun, Nikolaus Gravenstein, David A. Paulus, and Dietrich Gravenstein. "Preventing Operating Room Fire: An Alternate Approach." Anesthesia & Analgesia 103, no. 4 (2006): 1052. http://dx.doi.org/10.1213/01.ane.0000239088.27237.57.

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den Boer, John H. "Documenting operating procedures: A user friendly approach." Engineering Management International 3, no. 3 (1985): 209–13. http://dx.doi.org/10.1016/0167-5419(85)90008-0.

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Mechev, Stoyan. "An Approach for Detecting Security Vulnerabilities in Web Browsers for Mobile Operating Systems." Mathematics and Informatics 67, no. 5 (2024): 475–88. https://doi.org/10.53656/math2024-5-1-ana.

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This paper demonstrates that it is possible to access a mobile phone's sensors through a web browser without the user's knowledge. Thus mobile phones are vulnerable to side-channel attacks. A software tool was developed to check access to a smartphone's sensors and generate a report with results and recommendations. After reviewing scientific publications on the topic, a technical experiment was conducted to prove that access to various sensors of the examined device can be accessed without the user being aware of it. The experimental results show that Chrome and Samsung Internet browsers, running on Android, are vulnerable to side-channel attacks. The research methods used in this paper were comparative analysis, synthesis and technical experiment.

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Ballou, Philip J. "Ship Energy Efficiency Management Requires a Total Solution Approach." Marine Technology Society Journal 47, no. 1 (2013): 83–95. http://dx.doi.org/10.4031/mtsj.47.1.5.

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AbstractShip and fleet operating efficiencies are multifaceted and interdependent. As such, efficiency management must involve an integrated solution that extends across the entire operation of the fleet. No single metric can be used to indicate success or failure of improving overall efficiency. Rather, a comparative analysis of multiple metrics is required. Furthermore, to be viable, efficiency management must accommodate operating priorities, goals, and constraints. Technology to save fuel and reduce carbon footprint is only useful if critical mission objectives are also met. Most ships can reduce fuel consumption simply by slowing down, albeit at the expense of increased passage duration. Tactical objectives that require fast transit times or reliable just-in-time arrival may justify the associated increase in fuel consumption. Ship operators fulfilling those objectives must look for ways other than slow steaming to improve energy efficiency, including, for example, deployment optimization, smart voyage planning, and onboard energy management. Other key metrics associated with operating efficiency include health and safety of crew and cargo, ship life cycle costs, and unscheduled time in port. Through strategic application of multiple efficiency management tools, these costs may be maintained or reduced while supporting the operational objectives and constraints of ship, fleet, and operator. All of these aspects of ship and fleet operating efficiency may be quantitatively compared to previous baselines using objective benchmarking methodologies.

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Soudée, M. "Accreditation and Quality Approach in Operating Theatre Departments: the French Approach." Acta Chirurgica Belgica 105, no. 5 (2005): 442–49. http://dx.doi.org/10.1080/00015458.2005.11679757.

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Von Locquenghien, F., and B. Leibing. "An engineering approach for the prediction of fatigue damage in the part load regime." IOP Conference Series: Earth and Environmental Science 1079, no. 1 (2022): 012090. http://dx.doi.org/10.1088/1755-1315/1079/1/012090.

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Abstract Due to the volatile electricity received from solar and wind power plants, the energy market requires highly variable hydropower machines which are able to cope with fast changes of their operating regimes. With the need for flexible operation, Francis runners are exposed to various operating conditions outside the traditional operating range. Hence, the runners must be specifically designed for long time part load operation to meet hydraulic and structural requirements. Therefore, it is inevitable to have a reliable but also practical engineering approach in the design phase of the projects in order to ensure sufficient fatigue life of the Francis runners. Deep part load operation mainly consists of stochastic loads acting on the runner blades. Previous publications show that it is reasonable to normalize the Rainflow matrix of stress amplitudes to represent the characteristic behaviour at deep part load operation. Hence, it is feasible to utilize the normalized Rainflow matrix to predict the fatigue damage of Francis runner designs without prototype measurements. Within this paper, a scaling method to derive project specific fatigue results for deep part load is introduced and subsequently validated through an intercomparison of available strain gauge measurement data and prediction. Based on the results, the accuracy of the proposed engineering approach and possible impacts of different boundary conditions are discussed.

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Lu, Fei, Jian Zhang, Haonan Chen, and Zichen Chen. "Analysis and Simulation of Lateral Collision Risk under Paired Approach." Mathematical Problems in Engineering 2024 (March 29, 2024): 1–15. http://dx.doi.org/10.1155/2024/7021298.

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The paired approach can improve the efficiency of closely spaced parallel runways. Calculating the probability and frequency of horizontal overlap is an indispensable step when evaluating the horizontal collision risk of the paired approach. As the generation of horizontal overlap probability is closely related to horizontal position error, we propose a calculation method of horizontal overlap probability based on position error from the perspective of pilot operation. First, according to the principle of flight mechanics, the attitude adjustment model is established for the horizontal direction of the approach process, and the pilot’s operation model for various position errors is based on the concept of the stochastic process. This attitude adjustment model can replicates the process of the pilot operating the steering column to change the aircraft’s attitude. When combined with the pilot’s operation model, it is possible to simulate the position errors generated during the approach process. Building on this, the horizontal overlapping conditions of two aircraft are analyzed to simulate the horizontal overlap process in the paired approach. The duration and instances of overlap counted and the ratio between these results and the total running time give the overlap probability and frequency. Multiple simulations in MATLAB reveal that higher pilot operating accuracy shortens the time for the aircraft to align with the course, whereas lower accuracy leads to unstable horizontal position errors. Furthermore, the horizontal overlap in paired approaches primarily occurs at the beginning of the procedure, and enhancing the pilot’s operating accuracy does not significantly affect the probability and frequency of horizontal overlap.

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Noguchi, H., E. Fong, M. H. Oo, et al. "Alternative approach to improving operating flux of MBR." Water Practice and Technology 13, no. 1 (2018): 39–44. http://dx.doi.org/10.2166/wpt.2018.010.

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Abstract Application of micro-filtration and ultra-filtration membranes for water reclamation has grown significantly in recently years due to lower foot print and stable product water quality. For membrane bioreactor (MBR) application, it is critical to improve the sludge quality to allow membrane systems to operate at higher flux without significant trans-membrane pressure (TMP) increase. It was found that quality of mixed liquor can be enhanced by hydrocyclone to improve the operating flux of MBR. When the membrane system was exposed to a dense particle fraction of the mixed liquor after installation of hydrocyclone, TMP was found to be stable at 16–18 kPa for approximately 8 months while operating at net flux 25 L/m2-hr (LMH). Then, TMP gradually increased to 21 kPa in the next 6 months and sharply increased to 35 kPa toward the end of this investigation. It means TMP was relatively stable without any need of recovery cleaning for over one year of operation. The improvement of MBR performance by introducing a hydrocyclone could be due to removal of unwanted mixed liquor as overflow. The dense component of the mixed liquor as overflow of hydrocyclone should be retained in the MBR system.

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Erokhin, Gennady, and Dmitry Chernikov. "INFLUENCE OF SERVICE LIFE ON THE RELIABILITY OF GRAIN HARVESTERS." SCIENCE IN THE CENTRAL RUSSIA, no. 2 (April 30, 2025): 77–87. https://doi.org/10.35887/2305-2538-2025-2-77-87.

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The influence of the service life of grain harvesters on their reliability was studied. A methodical approach was used to assess the reliability of grain harvesters based on the results of their work in harvesting grain crops. The availability factor was considered as a reliability indicator. The initial data are formed by a set of indicators, the main ones being: combine threshing, engine operating time during grain harvesting and operating time since the start of operation. A distinctive feature of this approach is the collection of information without labor-intensive operations of timing the elements of operating time. The methodical approach was implemented to study changes in the reliability of grain harvesters in a specific agricultural enterprise. The enterprise's combines Don 1500B, ACROS 530, KZS 1218 PALESSE, which harvested in 2013-2024, were observed. For each year, initial information was collected and combine availability factors were calculated, tied to the engine operating time. As a result, 114 estimates of the availability factor and total engine operating time were obtained. Regression equations were obtained that describe the dependencies of the grain harvester availability factor on the engine operating time and service life. The revealed dependencies characterize the average reliability of grain harvesters of the Rostselmash and Gomselmash companies. Analysis of the obtained results shows that with an increase in the total engine operating time, the reliability of the combines decreases. With an engine operating time of 200 hours, their availability factor is 0.92; with an operating time of 1,500 hours - 0.79, with an operating time of 3,000 hours - 0.64. The availability factor significantly decreases with an increase in the combine's service life. Thus, with an operating life of 1 year, the availability factor was 0.92, with an operation of 10 years (standard service life) - 0.72, with an operation of 20 years - 0.50. The research results allow us to predict the reliability and operational performance of grain harvesters of different service lives.

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Buckley, Francis P., Hannah Vassaur, Meghan Woody, and Daniel C. Jupiter. "Team-based approach to foregut surgery optimizes operative times and decreases operating room costs." Journal of the American College of Surgeons 219, no. 4 (2014): e36-e37. http://dx.doi.org/10.1016/j.jamcollsurg.2014.07.483.

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Gawande, S. H., L. G. Navale, M. R. Nandgaonkar, D. S. Butala, and S. Kunamalla. "Fault Detection of Inline Reciprocating Diesel Engine: A Mass and Gas-Torque Approach." Advances in Acoustics and Vibration 2012 (September 20, 2012): 1–6. http://dx.doi.org/10.1155/2012/314706.

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Early fault detection and diagnosis for medium-speed diesel engines are important to ensure reliable operation throughout the course of their service. This work presents an investigation of the diesel engine combustion-related fault detection capability of crankshaft torsional vibrations. Proposed methodology state the way of early fault detection in the operating six-cylinder diesel engine. The model of six cylinders DI Diesel engine is developed appropriately. As per the earlier work by the same author the torsional vibration amplitudes are used to superimpose the mass and gas torque. Further mass and gas torque analysis is used to detect fault in the operating engine. The DFT of the measured crankshaft’s speed, under steady-state operating conditions at constant load shows significant variation of the amplitude of the lowest major harmonic order. This is valid both for uniform operating and faulty conditions and the lowest harmonic orders may be used to correlate its amplitude to the gas pressure torque and mass torque for a given engine. The amplitudes of the lowest harmonic orders (0.5, 1, and 1.5) of the gas pressure torque and mass torque are used to map the fault. A method capable to detect faulty cylinder of operating Kirloskar diesel engine of SL90 Engine-SL8800TA type is developed, based on the phases of the lowest three harmonic orders.

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Pokrovskaya, O. D., G. I. Nikiforova, V. V. Nikiforov, and G. I. Pankrateva. "Modern approach in railcar fleet management." E3S Web of Conferences 549 (2024): 04011. http://dx.doi.org/10.1051/e3sconf/202454904011.

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The operation of railway transportation has a number of peculiarities. The transfer of the railcar fleet to the ownership of operating companies has obviously led to changes in the management of railway transportation. The analysis of the total freight turnover and the number of managed railcars shows that 20 largest railcar fleet operators are market leaders. Despite a number of advantages, the ownership of rolling stock by private companies causes a number of problems, the most acute of which are surplus and deficit of the railcar fleet, accumulation of “abandoned” trains. Such problems are especially evident in the logistics chains of international transportation corridors. In this regard, it is advisable to analyze the controlling actions of all participants of the transportation process, to assess the degree of participation of each operator. Solving the problems of railcar fleet management using the restrictions of pulling cars on the main infrastructure tracks with seeming advantages leads to the increasing railcar turnover and, as a consequence, the growth of the operating railcar fleet, i. e. potential surplus. Regulation of the railcar fleet should be carried out using the system of technical standardization. However, the system itself is subject to revision, especially with regard to the planning period by reducing the latter. Increasing the dynamics of regulation will make it possible to meet the transportation needs in time, avoid accumulation of “abandoned” trains, specify the operating car fleet managed by companies - operators and bring railway transportation closer to the logistic principles of freight delivery. For this purpose, it is expedient to study in detail the technology of interaction of all railway transportation participants, especially including them in multimodal transport corridors.

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Ivaneshkin, A. I. "A New Approach to Operating with Undirected Trees." Cybernetics and Systems Analysis 57, no. 1 (2021): 124–32. http://dx.doi.org/10.1007/s10559-021-00335-z.

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Calacsan, Stacie L., and Patty R. Lee. "A WEB-BASED APPROACH FOR STANDARD OPERATING PROCEDURES." Proceedings of the Water Environment Federation 2000, no. 7 (2000): 283–89. http://dx.doi.org/10.2175/193864700784546981.

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YILDIRIM, Bahadır Fatih, Sultan KUZU, and Muhlis ÖZDEMİR. "Evaluating Mobile Operating Systems Using Fuzzy VIKOR Approach." Afyon Kocatepe Üniversitesi Sosyal Bilimler Dergisi 18, no. 1 (2016): 79–95. http://dx.doi.org/10.5578/jss.26290.

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Brismar, J. "Understanding receiver-operating-characteristic curves: a graphic approach." American Journal of Roentgenology 157, no. 5 (1991): 1119–21. http://dx.doi.org/10.2214/ajr.157.5.1927798.

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Choi, Hyung Rim, Hyun Soo Kim, Byung Joo Park, Nam-Kyu Park, and Sang Wan Lee. "An ERP approach for container terminal operating systems." Maritime Policy & Management 30, no. 3 (2003): 197–210. http://dx.doi.org/10.1080/0308883032000089549.

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Dalton, Chris, and Tse Huong Choo. "An operating system approach to securing e-services." Communications of the ACM 44, no. 2 (2001): 58–64. http://dx.doi.org/10.1145/359205.359228.

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Agne, Andreas, Markus Happe, Ariane Keller, et al. "ReconOS: An Operating System Approach for Reconfigurable Computing." IEEE Micro 34, no. 1 (2014): 60–71. http://dx.doi.org/10.1109/mm.2013.110.

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Sridharan, M., M. V. Salapaka, and A. K. Somani. "A practical approach to operating survivable WDM networks." IEEE Journal on Selected Areas in Communications 20, no. 1 (2002): 34–46. http://dx.doi.org/10.1109/49.974660.

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Gao, Yanghe, Jie Ji, Mingliang Liang, et al. "A Virtual Power Plant Operating Approach for Steelworks." Journal of Physics: Conference Series 2351, no. 1 (2022): 012044. http://dx.doi.org/10.1088/1742-6596/2351/1/012044.

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The production process of steel can be divided into two processes: from ironstone to steel (long process) or from steel scrap to steel (short process). As for short process, through the automatic control system, the electric arc furnace (EAF) can be temporarily shut down to realize the load regulation, which helps to maintain power balance during the peak load period. In this paper, Virtual Power Plant (VPP) is considered to aggregate steelworks to participate in demand response project. By studying the production process of steelworks, we build an optimization model which maximizes the net revenue of VPP with satisfying the operating constraints. The performance of the proposed model is validated using a VPP which is composed of four steelworks with 10 EAFs.

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Bender, Jeffrey S., Teodora O. Nicolescu, Susan B. Hollingsworth, Krystal Murer, Kristina R. Wallace, and William J. Ertl. "Improving operating room efficiency via an interprofessional approach." American Journal of Surgery 209, no. 3 (2015): 447–50. http://dx.doi.org/10.1016/j.amjsurg.2014.12.007.

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Testi, Angela, Elena Tanfani, and Giancarlo Torre. "A three-phase approach for operating theatre schedules." Health Care Management Science 10, no. 2 (2007): 163–72. http://dx.doi.org/10.1007/s10729-007-9011-1.

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Natarajan, Sangeetha, and Gayathri Kasinathan. "A Hybrid MIP-CBO Approach for Loss Minimization of the PMSM-fed Electric Vehicle Drive System." Engineering, Technology & Applied Science Research 13, no. 6 (2023): 12278–83. http://dx.doi.org/10.48084/etasr.6396.

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This paper presents an efficient operation method suitable for Permanent Magnet Synchronous Motors (PMSMs). The proposed algorithm provides control of copper and iron losses across the range of operations. The machine operating concept was initially reviewed to establish the control method, and a model was created for control purposes. The efficient operation boundary of the machine was then established based on PMSM voltage and current constraints. A rapid search for the optimal operating point was made possible by a hybrid COOT optimization with Mixed Integer Programming. This expands the high-efficiency area of the motor drive in an electric vehicle, leading to longer Km between charges.

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Just, T., E. Lankenau, G. Hüttmann, and H. W. Pau. "Intra-operative application of optical coherence tomography with an operating microscope." Journal of Laryngology & Otology 123, no. 9 (2009): 1027–30. http://dx.doi.org/10.1017/s0022215109004770.

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AbstractObjective:To introduce the use of optical coherence tomography with an operating microscope for intra-operative evaluation of the human larynx.Methods:A specially equipped operating microscope with integrated spectral domain optical coherence tomography apparatus was used during microlaryngoscopy.Results:Technical improvements in optical coherence tomography equipment (e.g. pilot beam, variable focal distance, improved image quality and integration into an operating microscope) have enabled greater sensitivity and imaging speed and a non-contact approach. Spectral domain optical coherence tomography now enables a better correlation between optical coherence tomography images and histological findings. With this new technology, the precision of biopsy can be improved during microlaryngoscopy.Conclusions:Use of this new optical coherence tomography technology, integrated into an operating microscope, enables the surgeon to define the biopsy site location and resection plane precisely, while the optical zoom of the operating microscope can be used over the complete range.

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Shendalev, A. N., and O. A. Shendaleva. "STATISTICAL APPROACH IN DEVELOPING ALGORITHMS FOR RISK ANALYSIS OF SMALL INDUSTRIAL ENTERPRISES." Informatika i sistemy upravleniya, no. 3 (2021): 39–52. http://dx.doi.org/10.22250/isu.2021.69.39-52.

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The article deals with the problem of reducing the technological risks of an enterprise. To solve the problem, a risk assessment model is proposed, based on the analysis of information about the time and operating conditions of operation of technical facilities. An algorithm for analyzing technological risks has been developed and recommendations for further operation of the facility have been formu-lated.

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AL–GAZU, ALI. "The use of «hard standards» for measuring and control operating costs." Market Relations Development in Ukraine №10 (209) 2018 136 (November 29, 2018): 87–95. https://doi.org/10.5281/zenodo.1689961.

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The subject of the study. Primarily, when considering the use of «strict» standards for measuring and controlling operating costs, it is advisable to analyze certain aspects of the interaction between the commodity and financial flows of an aviation company. However, the issue of mutual movement of goods and financial flows, in particular, determines the mobility of material resources or, in General, the constancy of the formation of operating costs, may be the subject of consideration from the point of view of other management subsystems of the aviation company. The purpose of article is to substantiate and reveal the essential understanding of the recommendations for a generalized analysis of the optimality of the movement of goods and financial flows of the aviation company. Methodology of the work. To solve the problems were used: comparative and statistical analysis, the method of logical generalization; methods of economic and mathematical modeling; method of economic and mathematical analysis. The result of the work. The sequence of consideration of optimization of movement of goods and financial flows of the aviation company through generalization of consideration of efficiency of activity of the studied aviation company that is revealed thanks to achievement of financial stability, stability of development and competitiveness is defined. Conclusions: according to the stages of the procedure for assessing the optimality of the movement of goods and financial flows of the aviation company, a whole set of estimates of the interdependent movement of the components of commodity and financial flows is calculated. In the case of a comparative analysis of the activities of different aviation companies, or the activities of the aviation company at different time intervals to determine the optimal assessment of the movement of goods and financial flows, it is advisable to consider the impact between the same components of the studied flows

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Leontiev, Oleksii, and Maryna Naumenko. "Methodical approach to forecasting costs for updating and using arms and military equipment park." Military Technical Collection, no. 24 (May 20, 2021): 37–45. http://dx.doi.org/10.33577/2312-4458.24.2021.37-45.

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A methodological approach to forecasting the cost costs at the main stages of the life cycle of a sample of weapons and military equipment, as one of the most important carriers of the capabilities of military organizational-staff formations, is proposed, which is carried out when substantiating measures for developing the capabilities of troops in the course of long-term and medium-term defense planning. The methodological approach is based on the use of the concept of a typical distribution of the cost of the life cycle of a sample by stages and stages, which allows in a formalized form to link costs at each stage of the purchase price of a serial product of a sample of weapons and military equipment of a specific type and type, taking into account the choice of a specific way of obtaining weapons and military equipment. It is proposed to forecast the volume of necessary costs at the stage of operation and support, taking into account the uneven distribution of these costs during this stage of the life cycle of a separate product. For this, it is proposed to divide the entire period of the duration of the operation stage into two main parts. The first part corresponds to the operating conditions of the product with a constant failure rate of the equipment after the completion of a short running-in process, and the operating costs per unit of time on it are considered the same throughout its duration. A formalized expression is proposed for obtaining the predicted value of these costs depending on the purchase price of the product. In the second part of the period of operation and support of a product of weapons and military equipment, operating costs per unit of time change over time according to an exponential law, reflecting the fact that operating costs increase with an increase in the failure rate as it approaches the assigned service life, which corresponds to the laws, known from the general theory of reliability of technology. The specifics of forecasting the costs of operation and support of a product obtained by import and which has already been in operation and has a residual service life have been determined.

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Biryukova, M. V., A. Tufan, and V. Yu Ermakov. "Approach to Reducing Vibroactivity of Small Spacecraft." Herald of the Bauman Moscow State Technical University. Series Mechanical Engineering, no. 1 (144) (March 2023): 4–21. http://dx.doi.org/10.18698/0236-3941-2023-1-4-21.

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Flawless spacecraft operation and successful implementtation of their research in orbit mainly depend on technical and operational characteristics of the spacecraft orientation and stabilization control systems in space relative to the base frame of reference axes achieved through stabilizing properties of certain external and internal perturbations. The research was aimed at determining static and dynamic imbalances and analyzed the levels of influence of forces and moments created by non-contact electric motor-flywheel operating at the various rotor speeds. In order to reduce the static and dynamic imbalance of the non-contact electric motor-flywheel obtained as a result of ongoing experimental studies, it was proposed to introduce a vibration isolator with natural frequency significantly lower than that in the conventional systems in order to statically hold the non-contact electric motor-flywheel during ground and flight operation. The vibration isolator should have small mass and rigidity, as well as a wide range of operating temperatures, etc. Depending on the orbit altitude, the moments of external disturbing forces acting on the Iskra-5 spacecraft were determined. Electric DC motor-flywheels of various types were analyzed. It was shown that introduction of the non-contact electric motor-flywheel as the executive element of the orientation and stabilization control systems on small spacecraft improved the orientation accuracy. Ways to reduce the effect of vibration disturbances on the spacecraft structure from the non-contact electric motor-flywheel were considered

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Zdravković, Zlatoje, Petar Vukelja;, and Jovan Mrvić. "Insulation co-ordination for continuous operating voltages and temporary overvoltages." Electrical Engineering Archiv für Elektrotechnik 88, no. 5 (2005): 441–46. https://doi.org/10.1007/s00202-004-0290-y.

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This paper presents an approach to the insulation co-ordination of electric-power installations in the scope of the continuous operating voltages and temporary overvoltages; this approach opens the possibility to calculate the necessary required withstand voltages of unit insulations for short-duration (1 min) power-frequency test voltage, with respect to continuous operating voltages and power-frequency temporary overvoltages and the necessary reliability of the operation of high-voltage power system installations.

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Akbari, M., A. Afshar, and S. Jamshid Mousavi. "Stochastic multiobjective reservoir operation under imprecise objectives: multicriteria decision-making approach." Journal of Hydroinformatics 13, no. 1 (2010): 110–20. http://dx.doi.org/10.2166/hydro.2010.012b.

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Multiobjective reservoir operations are generally complex, as they are often associated with a large quantity of uncertain factors in combination with noncommensurable objectives. In this study, fuzzy-state stochastic dynamic programming (FSDP) and multicriteria decision-making (MCDM) are integrated to derive operating rules for a single multiobjective reservoir operation problem. The model addresses uncertainties due to randomness in inflows and imprecision in variables' discretization and objectives. The FSDP model takes into account uncertainties due to the random nature of inflows and imprecision due to variable discretization. Imprecise and noncommensurable objectives are quantified by a set of subjective criteria, the aggregation of which is performed through an MCDM model, by which possible decisions at every stage of the FSDP model are evaluated and compared. The proposed approach is then employed in deriving operating rules for the Karoon 1 reservoir in south-west Iran and the rules are tested and evaluated through simulation. Results show the model's capability in handling different kinds of uncertainties involved in real reservoir operation problems.

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Janjornmanit, Suchart, Sakorn Panta, and Vishnu Thonglek. "An approach of controlling the inverter-based generator for use in an islanded microgrid." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 3 (2020): 1610. http://dx.doi.org/10.11591/ijpeds.v11.i3.pp1610-1616.

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The controls of power generation by the inverter-based generator are proposed in this work. The proposed control adjusts the active power output by varying the phase angle instead of the conventional frequency variation. The benefit of operating the network by a fixed frequency is that it eradicates the problems associated with the frequency deviation. The PID controls with recommended gain adjustment are proposed to control the power generation. The power generation schemes are adapted from the classical power generation by the synchronous generator, where the modes of operation are Swing, PV and PQ mode. The proposed three modes of operation are adequate to operate fully in a small-scale power system such as in an islanded microgrid. A case study of operating the proposed controls in a microgrid by simulation is used to demonstrate the feasibility of implementation of the controls.

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Suchart, Janjornmanit, Panta Sakorn, and Thonglek Vishnu. "An approach of controlling the inverter-based generator for use in an islanded microgrid." International Journal of Power Electronics and Drive System (IJPEDS) 11, no. 3 (2020): 1610–16. https://doi.org/10.11591/ijpeds.v11.i3.pp1610-1616.

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Bauerochs, Tobias, Stephan Ulrich, Steffen Schneider, and Rainer Bruns. "Approach on the improvement of the durability of an electrorheological valve." Journal of Intelligent Material Systems and Structures 29, no. 19 (2018): 3737–47. http://dx.doi.org/10.1177/1045389x18799194.

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This work presents an approach on the improvement of the durability of an electrorheological valve and an electrorheological fluid. The pressure difference which can be achieved with the electrorheological effect is determined at the electrorheological valve. In order to simulate realistic operating conditions and to obtain a time-dependent pressure difference, several experiments are carried out in which the electrorheological fluid is permanently loaded over a period of several days with a field strength of up to 5 kV/mm. The results show that a simulated operating time of 2000 h would be possible without any problems. The knowledge gained on the characteristics of the electrorheological valve and electrorheological fluid in continuous operation is important for the design of electrorheological applications in order to estimate and determine their service life.

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Vorontsova, I. O., R. K. Goncharov, D. V. Tupyakov, F. D. Kiselev, and V. I. Egorov. "Numerical approach to compound quantum repeater scheme with coherent states." Computer Optics 48, no. 1 (2024): 81–85. http://dx.doi.org/10.18287/2412-6179-co-1322.

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A numerical model of a quantum repeater operating with Schrödinger cat states is constructed. The model describes the performance of such a system in the presence of decoherence effects, namely, noise in the quantum channel and the efficiency of the photon-number-resolving detector. In the framework of the numerical model, a theoretical analysis of the system functioning is carried out for the elementary link by calculating its performance characteristics. Namely, we calculate photodetector click probabilities and fidelity for various sets of decoherence parameters. These estimates are necessary in the context of further experimental research at the junction with other branches of quantum communications, so that to use the entanglement distribution when it comes to operating quantum teleportation and quantum key distribution protocols based on entanglement. The model will be developed further as a versatile drag-and-drop software simulating the full-fledged entanglement swapping protocol operation.

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Rahman, Md Mahfuzur, Rubayet Karim, Md Moniruzzaman, Md Afjal Hossain, and Hammad Younes. "Modeling Hospital Operating Theater Services: A System Dynamics Approach." Logistics 7, no. 4 (2023): 85. http://dx.doi.org/10.3390/logistics7040085.

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Background: A hospital’s operating theater service system is a large-scale, complicated system that must be carefully managed to offer the best possible results for its patients. Unlike other industries such as manufacturing and logistics, system dynamics (SD) methodologies are not extensively applied in hospital operating theaters. This study deals with the future development and possible future scenarios for hospital operating rooms in Bangladesh. Methods: Due to demographic dynamics and demographic processes, increased pressures on hospital care are expected in Bangladesh. The SD model anticipates possible future scenarios, reconciles service capacities and the variability of patient demand, and reduces patient congestion and waiting times in the hospital area. This study introduces a causal loop diagram to show a causal link between the hospital operating theater system variables. It also introduces a stock flow diagram to understand the dynamic behavior of the system. Results: The model validation testing reports that in extreme conditions, such as a 50% reduction in the patient arrival rate, the model is valid and runs as usual. Conclusions: This first work of SD modeling for hospital operating theater systems can help healthcare managers, decision makers, or researchers of any responsibility level make better predictions in order to reduce patient waiting times and backlogs and make appropriate decisions.

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D’Acierno, Luca, Marilisa Botte, Mariano Gallo, and Bruno Montella. "Defining Reserve Times for Metro Systems: An Analytical Approach." Journal of Advanced Transportation 2018 (2018): 1–15. http://dx.doi.org/10.1155/2018/5983250.

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The aim of this paper is to provide an analytical approach for determining operational parameters for metro systems so as to support the planning and implementation of energy-saving strategies. Indeed, one of the main targets of train operating companies is to identify and implement suitable strategies for reducing energy consumption. For this purpose, researchers and practitioners have developed energy-efficient driving profiles with the aim of optimising train motion. However, as such profiles generally entail an increase in travel times, the operating parameters in the planned timetable need to be appropriately recalibrated. Against this background, this paper develops a suitable methodology for estimating reserve times which represent the main rate of extra time needed to put ecodriving strategies in place. Our proposal is to exploit layover times (i.e., times spent by a train at the terminus waiting for the next trip) for energy-saving purposes, keeping buffer times intact in order to preserve the flexibility and robustness of the timetable in case of delays. In order to show its feasibility, the approach was applied in the case of a real metro context, whose service frequency was duly taken into account. In particular, after stochastic analysis of the parameters involved for calibrating suitable buffer times, different operating schemes were simulated by analysing the relationship between layover times, number of convoys, and feasible headway values. Finally, some operation configurations are analysed in order to quantify the amount of energy that can be saved.

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Habibollahi Najaf Abadi, Hamidreza, and Mohammad Modarres. "Predicting System Degradation with a Guided Neural Network Approach." Sensors 23, no. 14 (2023): 6346. http://dx.doi.org/10.3390/s23146346.

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Evaluating the physical degradation behavior and estimating the lifetime of engineering systems and structures is crucial to ensure their safe and reliable operation. However, measuring lifetime through actual operating conditions can be a difficult and slow process. While valuable and quick in measuring lifetimes, accelerated life testing is often oversimplified and does not provide accurate simulations of the exact operating environment. This paper proposes a data-driven framework for time-efficient modeling of field degradation using sensor measurements from short-term actual operating conditions degradation tests. The framework consists of two neural networks: a physics discovery neural network and a predictive neural network. The former models the underlying physics of degradation, while the latter makes probabilistic predictions for degradation intensity. The physics discovery neural network guides the predictive neural network for better life estimations. The proposed framework addresses two main challenges associated with applying neural networks for lifetime estimation: incorporating the underlying physics of degradation and requirements for extensive training data. This paper demonstrates the effectiveness of the proposed approach through a case study of atmospheric corrosion of steel test samples in a marine environment. The results show the proposed framework’s effectiveness, where the mean absolute error of the predictions is lower by up to 76% compared to a standard neural network. By employing the proposed data-driven framework for lifetime prediction, systems safety and reliability can be evaluated efficiently, and maintenance activities can be optimized.

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Utgard, Mark, Howard Thomas, Arvin Singh, and Jacek Narozny. "The Atomic Model approach to operational assurance." APPEA Journal 53, no. 2 (2013): 449. http://dx.doi.org/10.1071/aj12060.

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There is an inherent risk in transitioning project personnel out and transitioning the incoming operating crew in with minimal disruption to operations and ensuring the integrity of the design. The key to mitigating this risk is to execute operational readiness assurance (ORA) processes, which provide confidence that a facility has seamless transition from design into operation, and that production targets are met in the first years of the asset's life. It is a rigorous process spanning engineering, construction, commissioning, handover, and operations; this ensures confidence in operation and asset life cost. This extended abstract focuses on a proven methodology to this aspect; it is highlighted using the Atomic Model approach, which is being implemented on the Wheatstone Processing Platform for Chevron. The atomic model consists of a nucleus (operability, reliability, and maintainability [ORM]) that provides the positive charge that will hold the whole process together; it also presents a consistent and operable asset to the operations and maintenance crew. The electrons—being the component parts—include competency, process safety, process control, operating and maintenance procedures, and maintenance management system. Together, these fully ensure operability. The enemy of ORM is complexity and the Atomic Model is a systematic approach to this complexity. Implemented by a team that views the project holistically, this approach produces a facility that is operated and maintained in a uniform manner. This consistent and disciplined approach to operations, maintenance, and reliability is the positive charge needed in the nucleus for the path towards seamless start-up.

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