140 results on '"Reliability criterion"'
Search Results
2. Current State and Prospects for Development of the Contract System in the Field of Public and Corporate Procurements
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Oparin, Sergey, Shcherbakova, Maria, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Manakov, Aleksey, editor, and Edigarian, Arkadii, editor
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- 2022
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3. Genomic prediction using composite training sets is an effective method for exploiting germplasm conserved in rice gene banks
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Sang He, Hongyan Liu, Junhui Zhan, Yun Meng, Yamei Wang, Feng Wang, and Guoyou Ye
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Genomic prediction ,Composite training set ,Rice germplasm ,Gene bank ,Reliability criterion ,Agriculture ,Agriculture (General) ,S1-972 - Abstract
Germplasm conserved in gene banks is underutilized, owing mainly to the cost of characterization. Genomic prediction can be applied to predict the genetic merit of germplasm. Germplasm utilization could be greatly accelerated if prediction accuracy were sufficiently high with a training population of practical size. Large-scale resequencing projects in rice have generated high quality genome-wide variation information for many diverse accessions, making it possible to investigate the potential of genomic prediction in rice germplasm management and exploitation. We phenotyped six traits in nearly 2000 indica (XI) and japonica (GJ) accessions from the Rice 3K project and investigated different scenarios for forming training populations. A composite core training set was considered in two levels which targets used for prediction of subpopulations within subspecies or prediction across subspecies. Composite training sets incorporating 400 or 200 accessions from either subpopulation of XI or GJ showed satisfactory prediction accuracy. A composite training set of 600 XI and GJ accessions showed sufficiently high prediction accuracy for both XI and GJ subspecies. Comparable or even higher prediction accuracy was observed for the composite training set than for the corresponding homogeneous training sets comprising accessions only of specific subpopulations of XI or GJ (within-subspecies level) or pure XI or GJ accessions (across-subspecies level) that were included in the composite training set. Validation using an independent population of 281 rice cultivars supported the predictive ability of the composite training set. Reliability, which reflects the robustness of a training set, was markedly higher for the composite training set than for the corresponding homogeneous training sets. A core training set formed from diverse accessions could accurately predict the genetic merit of rice germplasm.
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- 2022
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4. Optimal Loss of Load Expectation for Generation Expansion Planning Considering Fuel Unavailability.
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Diewvilai, Radhanon and Audomvongseree, Kulyos
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BAYES' theorem , *ELECTRIC power , *RENEWABLE energy sources , *TEST systems - Abstract
In generation expansion planning, reliability level is the key criterion to ensure enough generation above peak demand in case there are any generation outages. This reliability criterion must be appropriately optimized to provide a reliable generation system with a minimum generation cost. Currently, a method to determine an optimal reliability criterion is mainly focused on reserve margin, an accustomed criterion used by several generation utilities. However, Loss of Load Expectation (LOLE) is a more suitable reliability criterion for a generation system with a high proportion of renewable energy since it considers both the probabilistic characteristics of the generation system and the entire load's profile. Moreover, it is also correlated with the reserve margin. Considering the current fuel supply situation, a probabilistic model based on Bayes' Theorem is also proposed to incorporate fuel supply unavailability into the probabilistic criterion. This paper proposes a method for determining the optimal LOLE along with a model that incorporates fuel supply unavailability into consideration. This method is tested with Thailand's Power Development Plan 2018 revision 1 to demonstrate numerical examples. It is found that the optimal LOLE of the test system is 0.7 day/year, or shifted to 0.55 day/year in the case of considering the fuel supply unavailability. [ABSTRACT FROM AUTHOR]
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- 2022
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5. Effective sensor placement based on a VIKOR method considering common cause failure in the presence of epistemic uncertainty.
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Rong-Xing Duan, Jie-Jun He, Tao Feng, Shu-Juan Huang, and Li Chen
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SENSOR placement ,EPISTEMIC uncertainty ,FAULT trees (Reliability engineering) ,RELIABILITY in engineering ,COST structure ,FAILURE mode & effects analysis - Abstract
Owing to expensive cost and restricted structure, limited sensors are allowed to install in modern systems to monitor the working state, which can improve their availability. Therefore, an effective sensor placement method is presented based on a VIKOR algorithm considering common cause failure (CCF) under epistemic uncertainty in this paper. Specifically, a dynamic fault tree (DFT) is developed to build a fault model to simulate dynamic fault behaviors and some reliability indices are calculated using a dynamic evidence network (DEN). Furthermore, a VIKOR method is proposed to choose the possible sensor locations based on these indices. Besides, a sensor model is introduced by using a priority AND gate (PAND) to describe the failure sequence between a sensor and a component. All placement schemes can be enumerated when the number of sensors is given, and the largest system reliability is the best alternative among the placement schemes. Finally, a case study shows that CCF has some influence on sensor placement and cannot be neglected in the reliabilitybased sensor placement. [ABSTRACT FROM AUTHOR]
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- 2021
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6. Sufficiency Condition for the Reliability of Surface Topography Measurements using Atomic Force Microscopy.
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Kravchuk, A. S. and Kravchuk, A. I.
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SURFACE topography measurement , *ATOMIC force microscopy , *GEOMETRIC surfaces , *SURFACE topography , *SURFACE roughness , *ATOMIC force microscopes , *SURFACE preparation - Abstract
A condition for determining the sufficient reliability of nanoscale surface topography measurements using atomic force microscopy (AFM) for relatively small cantilever inclination angles is proposed. Relationships between the basic geometrical parameters of surface roughness, geometric deviations of the probe, the angles of the cantilever and the inclination of the side faces of the probe, as well as the dimensions of the nonlocal point of the probable contact of its side faces with protrusions of roughness, were established. The requirement to determine the smallness of the ratio of the sizes of a nonlocal point to the distance between neighboring nonlocal points as a necessary condition for the sufficient reliability of surface topographical measurements using AFM, is asserted. Publications in which nanoscale surface topography measurement fails to indicate the roughness of the sample surface and the probe, the angles at the tip of the probe and the inclination of the cantilever, as well as the best resolution (smallest increment) at which the study is carried out, cannot be accepted as reliable, due to the probabilistic character of results thus obtained. Moreover, surface images obtained using AFM without proper justification for the resolution (value of the measurement increment) represent only a qualitative picture, providing an insufficient basis for carrying out computational manipulations. In order to increase the reliability of measurements of nanoscale surface topography measurements using AFM, it is necessary to radically increase probe manufacture precision, as well as to use probes with the smallest possible angle at the apex. In addition, it is necessary to make changes in the design of AFM apparatus. In particular, the microscope stage should be designed to employ automatic rotation. It should provide closeness the probe axis direction to the normal to the average plane of the sample. This "integral" angle of rotation of the microscope stage is easily iteratively determined at the stage of preliminary investigation of the surface topography of the sample. In this case, it will be necessary to geometrically increase the length of the cantilever so that the base extends beyond the limits of the sample. [ABSTRACT FROM AUTHOR]
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- 2020
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7. Optimal Sensor Placement Based on System Reliability Criterion Under Epistemic Uncertainty
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Rongxing Duan, Yanni Lin, and Tao Feng
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Sensor placement ,dynamic fault tree ,dynamic evidential network ,epistemic uncertainty ,reliability criterion ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
Fault diagnosis usually requires lots of data that are collected through sensors mounted on some locations in the system. Performance of a diagnostic system is largely dependent upon the number and locations of sensors. Accordingly, optimization of sensor placement has a significant influence on the efficiency of fault diagnosis. In this paper, a novel sensor placement based on a system reliability criterion is proposed, which aims to deal with the failure dependence and epistemic uncertainty. Specifically, it develops a dynamic fault tree (DFT) model to describe the dynamic failure behaviors based on failure mode and effects analysis and uses the interval numbers to express the failure rates of components. Furthermore, an indicator of sensor placement, named diagnostic importance factor (DIF), is calculated by mapping a DFT into a dynamic evidential network, and a sorting method based on the relative superiority degree is used to determine the potential locations according to DIF of components. In addition, the failure probability of the top event is considered as the criterion for sensor placement optimization and all scenarios of sensor placement are prioritized based on the criterion. Finally, the effectiveness of the proposed method is demonstrated via application to a real braking system.
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- 2018
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8. Optimal Sizing of Energy Storage System in A Renewable-Based Microgrid Under Flexible Demand Side Management Considering Reliability and Uncertainties
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M. Majidi and S. Nojavan
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Energy storage system ,Renewable-based microgrid ,Reliability criterion ,Demand response program ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Production of electric energy or power. Powerplants. Central stations ,TK1001-1841 - Abstract
Utilization of energy storage system (ESS) in microgrids has turned to be necessary in recent years and now with the improvement of storage technologies, system operators are looking for an exact modeling and calculation for optimal sizing of ESS. In the proposed paper, optimal size of ESS is determined in a microgrid considering demand response program (DRP) and reliability criterion. Both larger and small-scale ESSs have their own problems. A large-scale ESS reduces microgrid operating cost but it includes higher investment costs while a small-scale ESS has less investment cost. The main goal of the proposed paper is find optimal size of ESS in which microgrid investment cost as well as operating cost are minimized. Since the renewable units may not have stable production and also because of the outages that conventional units may have, ESS is utilized and then a reliability index called reliability criterion is obtained. Furthermore, effects of reliability criterion and DRP on optimal sizing of ESS are evaluated. A mixed-integer programing (MIP) is used to model the proposed stochastic ESS optimal sizing problem in a microgrid and GAMS optimization software is used to solve it. Five study cases are studied and the results are presented for comparison.
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- 2017
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9. Adaptive‐robust multi‐resolution generation maintenance scheduling with probabilistic reliability constraint.
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Bagheri, Bahareh and Amjady, Nima
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This study presents a reliability‐constrained adaptive‐robust multi‐resolution model for generation maintenance scheduling (GMS) problem considering the uncertainty sources of electricity demand, wind power generation, and equipment unavailabilities. In the proposed tri‐level adaptive‐robust model, a polyhedral uncertainty set is used to model the electricity demand and wind power generation fluctuations. In addition, equipment unavailabilities as discrete uncertainty sources are modelled in the reliability sub‐problem where the expected energy not supplied is determined as a reliability criterion. Accordingly, the proposed model obtains a robust maintenance schedule for generating units immunised against the worst realisation of electricity demand and wind power generation while satisfying the reliability constraint considering equipment unavailabilities. Moreover, maintenance and operation periods are specifically modelled using different resolutions in the proposed multi‐resolution GMS approach. To solve the proposed reliability‐constrained adaptive‐robust multi‐resolution model, a new solution approach including Benders cut, reliability cut, and block coordinate descent method is presented. Numerical results on two test systems show the effectiveness of both the proposed GMS model and the proposed solution approach. [ABSTRACT FROM AUTHOR]
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- 2019
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10. Framework for trajectory‐based probabilistic security assessment of power systems.
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Perkin, Samuel, Hamon, Camille, Kristjansson, Ragnar, Stefansson, Hlynur, and Jensson, Pall
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Transmission system operators prepare against threats to system security through preventive actions and the planning of corrective actions. Required actions are determined by performing security analyses according to some reliability management approach and criterion. Probabilistic approaches have been proposed as an alternative to the deterministic N − 1 approach, by using a probabilistically filtered contingency list. This study begins by formally defining system trajectories, as a means of connecting the initiating contingency to the system response, corrective control, and restoration activities. A system trajectory considers the realisation of exogenous variables, as well as a sequence of contingencies and the subsequent system response and control behaviours. Using this definition, it is argued that the system trajectory should be modelled until service and component outages are resolved, rather than only modelling its reaction to the initiating contingency. The authors then propose some simplifying assumptions to achieve a scalable approach to probabilistic real‐time security assessment. To support this argument, contingency‐based and trajectory‐based probabilistic security assessments are compared in terms of their residual risk (the risk associated with future system trajectories that are not modelled). This comparison shows that security assessments based on trajectories allow for previously implicit assumptions on modelling accuracy to be made explicit. [ABSTRACT FROM AUTHOR]
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- 2019
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11. Characterizing Relevant Network Structure with Reliability Polynomials
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Eubank, Stephen, Youssef, Mina, Khorramzadeh, Yasamin, Abarbanel, Henry, Series editor, Braha, Dan, Series editor, Érdi, Péter, Series editor, Friston, Karl, Series editor, Haken, Hermann, Series editor, Jirsa, Viktor, Series editor, Kacprzyk, Janusz, Series editor, Kaneko, Kunihiko, Series editor, Kelso, Scott, Series editor, Kirkilionis, Markus, Series editor, Kurths, Jürgen, Series editor, Nowak, Andrzej, Series editor, Reichl, Linda, Series editor, Schuster, Peter, Series editor, Schweitzer, Frank, Series editor, Sornette, Didier, Series editor, Thurner, Stefan, Series editor, D'Agostino, Gregorio, editor, and Scala, Antonio, editor
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- 2014
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12. Reliability, criterion-concurrent validity, and construct-discriminant validity of a head-marking version of the taekwondo anaerobic intermittent kick test
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Issam Makhlouf, Aaron Uthof, Anis Chaouachi, David G. Behm, Mourad Hambli, Mohamed Arbi Mejri, and Amel Tayech
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Head (linguistics) ,business.industry ,Computer science ,Concurrent validity ,Discriminant validity ,Physical Therapy, Sports Therapy and Rehabilitation ,Pattern recognition ,Test (assessment) ,Physiology (medical) ,Reliability criterion ,Orthopedics and Sports Medicine ,Elite athletes ,Artificial intelligence ,Construct (philosophy) ,business ,Anaerobic exercise - Abstract
This study aimed to examine the reliability and validity of a head-marking version of the taekwondo anaerobic intermittent kick test (TAIKT-head). Twenty-seven (21 males and 6 females) taekwondo athletes performed TAIKT-head on two occasions (test-retest). In addition, they performed the chest-marking version of the TAIKT (TAIKT-chest), 30-s continuous jump (CJ30s), countermovement jump (CMJ) and flexibility tests. To establish TAIKT-head's construct validity (discriminatory capability), two subgroups were identified based on their international and national taekwondo results: 15 elite (12 males and 3 females) and 12 sub-elite (9 males and 3 females) athletes. TAIKT-head showed high relative (ICCs ≥ 0.90) and absolute (SEMsSWCs) reliability. The comparison between TAIKT-head and TAIKT-chest revealed that absolute and relative peak and mean powers were higher (p0.001) in TAIKT-head than in TAIKT-chest. In contrast, the fatigue index and rating of perceived exertion were lower in TAIKT-head than in TAIKT-chest (p0.001 and p0.01, respectively), with no significant difference between the two tests regarding physiological variables. Significant correlations between TAIKT-head and TAIKT-chest (r ranged from 0.74 to 0.53), CJ30s (r ranged from 0.84 to 0.43), and CMJ (r ranged from 0.88 to 0.79) were mostly "very large". There was no association between TAIKT-head and flexibility tests. Elite athletes showed greater TAIKT-head performances than sub-elite counterparts. Receiving operating characteristic analysis indicated that the TAIKT-head effectively discriminated between elite and sub-elite athletes. In conclusion, the TAIKT-head is a reliable and valid test to evaluate the specific intermittent anaerobic power of taekwondo athletes through the most used kicking technique at the head level.
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- 2022
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13. Possibilistic Coding: Error Detection vs. Error Correction
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Bortolussi, Luca, Sgarro, Andrea, Kacprzyk, Janusz, editor, Borgelt, Christian, editor, González-Rodríguez, Gil, editor, Trutschnig, Wolfgang, editor, Lubiano, María Asunción, editor, Gil, María Ángeles, editor, Grzegorzewski, Przemysław, editor, and Hryniewicz, Olgierd, editor
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- 2010
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14. Basic Notions of Power System Reliability
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- 2008
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15. Maintenance Improvement of an Aircraft Fleet by a Software Method Based on Reliability Criteria
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Righini, Renzo, Marcodini, Giuseppe, Treves, Daniele, Vopa, Pietro La, Spitzer, Cornelia, editor, Schmocker, Ulrich, editor, and Dang, Vinh N., editor
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- 2004
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16. Network Probabilistic Connectivity: Optimal Structures
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Rodionova, Olga K., Rodionov, Alexey S., Choo, Hyunseung, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Laganá, Antonio, editor, Gavrilova, Marina L., editor, Kumar, Vipin, editor, Mun, Youngsong, editor, Tan, C. J. Kenneth, editor, and Gervasi, Osvaldo, editor
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- 2004
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17. Genetic Algorithms for Drain Placement in Wireless Sensor Networks Optimal by the Reliability Criterion
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K. A. Volzhankina, A. S. Rodionov, and D. A. Migov
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Mathematical optimization ,Computer science ,Reliability (computer networking) ,Reliability criterion ,A priori and a posteriori ,Electrical and Electronic Engineering ,Condensed Matter Physics ,Network topology ,Instrumentation ,Wireless sensor network - Abstract
The problems of structural optimization of networks are considered in order to obtain the most reliable topologies under the conditions of random failure of their elements. As a reliability criterion, several indicators are given; nodes of the network are subject to failures. To accelerate the search for optimal solutions, we use the approach with cumulative refinement of the boundaries of network reliability which allows eliminating unreliable variants at earlier steps. It is proposed, at the intermediate stages of optimization within this approach, to provide the reliability estimate with the use of the trend for a priori reliable variants. The results of numerical experiments are given.
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- 2021
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18. Substantiation of the method of manufacturing gauze swabs depending on the purpose of use
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M. M. Ruban, S. V. Sander, O. P. Fejaga, V. M. Kroshka, and O. M. Lopushansky
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Veterinary medicine ,Materials science ,Optimal density ,Absorption of water ,law ,Reliability criterion ,Absorption capacity ,Plasticine ,General Medicine ,Medium density ,Slightly worse ,law.invention - Abstract
Annotation. Gauze remains the main dressing. It is used to make swabs for drying wounds and dissecting tissues. The purpose of the work is to establish the optimal density of the swab for drainage of the wound and preparation of tissues. Swabs made of 10x12 cm gauze fragments were investigated. The gauze fragments were weighed before and after immersion in water and the absorption capacity per unit dry weight was calculated. The dissecting properties of the swabs were investigated on plasticine blocks, the surface of which was pressed with a force of 12 N. The formed depressions were filled with gypsum. The volume and weight of the casts were determined. To determine the reliability of the difference between the two mean values used the reliability criterion t (Student’s test). It was found that loose swabs absorbed 913.5±43.9% of water, medium density – 766.3±55.2%, dense – 682.9±70.1 (p˂0.05). This is due to the fact that loose swabs have the largest in radius and length of the capillaries. When studying the recesses formed by embossing the swab on the surface of the block, it was found that when using loose swabs formed a deep conical recess, which indicated the risk of injury. When embossed with dry swabs of medium density received molds weighing 0.034±0.0000011 g, wet – 0.033±0.0000011 g (p>0.05). When using dense swabs – 0.037±0.0000011 g and 0.034±0.0000011 g, respectively (p˂0.05). Dense swabs showed the best dissecting properties. When wet, they are slightly but significantly reduced. Medium density swabs have slightly worse dissecting properties. When wet, they did not change significantly. We attribute the decrease in dissecting properties to the displacement of water from the gauze when pressed. Thus, loose swabs (∆M=913.5%±43.9%) absorb fluid best, which determines their predominant use for wound drying. Dense swabs are characterized by the lowest absorption capacity (682.9±70.1%), the best dissecting properties.
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- 2021
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19. The Capacity of a Possibilistic Channel
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Sgarro, Andrea, Goos, G., editor, Hartmanis, J., editor, van Leeuwen, J., editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Benferhat, Salem, editor, and Besnard, Philippe, editor
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- 2001
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20. RELIABILITY CRITERION AND A MODEL FOR DETERMINING THE OPTIMAL SPEED OF MOVEMENT ON AUTOMOBILE ROADS IN WINTER SLIDING CONDITIONS
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A. K. Kiyalbaev, D. E. Yessentay, S. N. Kiyalbay, and N. V. Borisуuk
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Braking distance ,Rolling resistance ,Road surface ,Air temperature ,Adhesion coefficient ,Reliability criterion ,Process (computing) ,Geology ,Geotechnical Engineering and Engineering Geology ,Reliability (statistics) ,Automotive engineering ,Mathematics - Abstract
The article presents a model for establishing the optimal speed of movement on highways, taking into account the determination of the braking distance in winter slippery conditions. According to the research results, it was established that the main criterion for the formation of road accidents on highways in winter slippery conditions is the drivers' underestimation of the adhesion qualities of road surfaces. The main criterion of the model under consideration is the interaction of the car wheel (braking distance) with the road (adhesion coefficient) and is a complex that characterizes the stability of the car rolling over on slippery surfaces and the driver's actions in making an effective decision and the duration of the reaction time. In the proposed mathematical model, the accident rate on a slippery road is estimated by the coefficient of adhesion of icy road surfaces, the value of the load or the average wheel pressure. Also, the frequency of load application, the amount of deflection of the coating (at an air temperature above +20 ° C), rolling resistance, the coefficient of adhesion of the car wheel to the coating. One of the main characteristics of the model is a subsystem - the average pressure p = Q / S (S is the area of the imprint of the wheel, cm²), etc. Thus, in the process of analyzing the results of the causes of road traffic accidents, the factors of the driver's reliability and the decisions made will be taken into account, which depend on the speed of vehicles in any condition of the road surface.
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- 2020
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21. Calculation of the Basic Reliability Parameters for the Model of a System with Dual Redundancy in Different Subsystems
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I. V. Pavlov and S. V. Razgulyaev
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Computer science ,Control theory ,Mechanical Engineering ,Reliability criterion ,Redundancy (engineering) ,Standby redundancy ,Function (mathematics) ,Safety, Risk, Reliability and Quality ,Industrial and Manufacturing Engineering ,Reliability (statistics) ,Dual (category theory) - Abstract
A model of a system with dual (active and standby) redundancy of the components in different subsystems, which significantly enhances its reliability, is considered. The basic formulas have been obtained for the calculation of the reliability function of the system depending on the multiplicity of the active and standby redundancy in the subsystems. The problem of constructing the lower confidence bound for the reliability criterion, which is the probability of the failure-free operation of the system for a preset time, has been considered. Approximate asymptotic expressions, for the case of high reliability, have been obtained for the reliability function of the system and its lower confidence bound.
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- 2020
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22. ПОТЕНЦИАЛ НАДЕЖНОСТИ ОБРАЗЦОВ ЯРОВОЙ ПШЕНИЦЫ ПО КОМПЛЕКСУ ПРИЗНАКОВ ДЛЯ СЕЛЕКЦИИ В УСЛОВИЯХ КРАСНОЯРСКОЙ ЛЕСОСТЕПИ
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Statistics ,Reliability criterion ,Pharmacology (medical) ,Selection (genetic algorithm) ,Mathematics - Abstract
Цель исследований: подобрать исходный материал для селекции экологически пластичных урожайных сортов мягкой яровой пшеницы, способных формировать зерно с высокими технологическими показателями, в условиях Красноярской лесостепи. Полевые опыты по изучению исходного материала 33 образцов мягкой яровой пшеницы сибирской селекции проведены в 2017–2019 гг. в ОПХ «Минино» Красноярского НИИСХ. Определение технологических показателей зерна осуществлено группой технологической оценки селекционного материала Красноярского НИИСХ. Из разбираемых показателей качества зерна наиболее стабильными являлись натура зерна, качество клейковины по ИДК-1. Высокая изменчивость была характерна для силы муки. От слабой до средней степени сортовое варьирование отмечено по количеству сырой клейковины, содержанию белка в зерне, стекловидности. Обработка полученных данных по методике Д.А. Сапрыгина позволила провести комплексный анализ с учетом урожайности массы 1000 зерен, содержания белка и клейковины, устойчивости к полеганию, продолжительности вегетационного периода и объективно выделить образцы пшеницы по критерию запасаемой энергии в урожае зерна и критерию их надежности. Образцы, запасающие энергию в пределах 88–95 кДж, имеют возможность занимать значительные площади посева и служить для селекционера хорошим исходным материалом для гибридизации: Красноярская 12, Алтайская 70, К-518-4, Курагинская 2, К-534-2, Новосибирская 18, Новосибирская 29, Предгорная, Омская Краса, К-527-2, Сибирский Альянс. Максимальные баллы (164–191) в разных условиях вегетации по критерию надежности имели образцы: среднеспелые – Красноярская 12, К-518-4, К-534-2, Новосибирская 18, Омская Краса, Сибирский Альянс; среднеранние – Алтайская 70, Новосибирская 29, Омская 32, Тулунская 12.
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- 2020
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23. Framework for Evaluating and Comparing Performance of Power System Reliability Criteria.
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Heylen, Evelyn, Labeeuw, Wouter, Deconinck, Geert, and Van Hertem, Dirk
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ELECTRIC power system reliability , *MATHEMATICAL programming , *OPERATIONS research , *SOCIOECONOMIC factors - Abstract
Evolutions in the power system challenge the manner in which power system reliability is managed. In particular, currently used reliability criteria, typically the deterministic N-1 criterion, are increasingly inadequate. Moving to an alternative approach is difficult as quantifying benefits is hard in a multifaceted environment and system operators are reluctant to move away from the easy and transparent existing criterion. This paper presents a generic framework to evaluate and compare socio-economic and reliability performance of power system reliability criteria, focussing on the short term decision making process of transmission system operators (TSO). The framework can also be used to tune the parameters of reliability criteria. Short term operational planning and real time operation TSO decision making processes are simulated considering various reliability criteria. The framework is applied to a 5 node test system and the 24 node IEEE reliability test system, showing that the applied probabilistic reliability criterion outperforms deterministic N-0 and N-1 approaches in those systems in terms of expected reliability and socio-economic indicator values. The effect is larger in the bigger system with more operational flexibility. [ABSTRACT FROM PUBLISHER]
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- 2016
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24. A Study on Electrical Reliability Criterion on Through Silicon Via Packaging.
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Ben-Je Lvvo, Kuo-Hao Tseng, and Kun-Fu Tseng
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THROUGH-silicon via ,THREE-dimensional integrated circuits ,MICROELECTRONIC packaging ,RELIABILITY in engineering ,WEIBULL distribution - Abstract
Three-dimensional (3D) structure with through silicon via (TSV) technology is emerging as a key issue in microelectronic packaging industry, and electrical reliability has become one of the main technical subjects for the TSV designs. However, criteria used for TSV reliability tests have not been consistent in the literature, so that the criterion itself becomes a technical argument. To this end, this paper first performed several different reliability tests on the testing packaging with TSV chains, then statistically analyzed the experimental data with different failure criteria on resistance increasing, and finally constructed the Weibull failure curves with parameter extractions. After comparing the results, it is suggested that using different criteria may lead to the same failure mode on Weibull analyses, and 65% of failed devices are recommended as a suitable termination for reliability tests. [ABSTRACT FROM AUTHOR]
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- 2016
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25. Optimization of Mathematical Modeling of Functional-Consumer Processes in Special and Dual-Purpose Polymer Materials
- Author
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A. V. Demidov, N. V. Pereborova, S. V. Kiselev, and A. G. Makarov
- Subjects
chemistry.chemical_classification ,Dual purpose ,Basis (linear algebra) ,chemistry ,Computer science ,General Chemical Engineering ,Reliability criterion ,General Materials Science ,General Chemistry ,Biochemical engineering ,Polymer - Abstract
An approach for optimizing mathematical modeling of functional-consumer processes in special purpose polymer materials is considered. The presented optimization is carried out on the basis of the integral forecasting reliability criterion for relaxation-recovery processes.
- Published
- 2020
- Full Text
- View/download PDF
26. METHODS OF EXPERIMENTAL STUDIES TO ASSESS THE FMS ON THE RELIABILITY CRITERION
- Author
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Vladimir Bogutskiy
- Subjects
Computer science ,Reliability criterion ,Reliability engineering - Published
- 2019
- Full Text
- View/download PDF
27. Calculation of the Surface Tension of the Vapor–Liquid Interface According to the Gibbs Thermodynamic Definition
- Author
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E. S. Zaitseva and Yu. K. Tovbin
- Subjects
Materials science ,Thermodynamics ,02 engineering and technology ,Crystal structure ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Curvature ,01 natural sciences ,0104 chemical sciences ,Surface tension ,Metastability ,Lattice (order) ,Thermal ,Reliability criterion ,Vapor liquid ,Physical and Theoretical Chemistry ,0210 nano-technology - Abstract
A procedure to calculate the surface tension is developed based on a modified lattice gas model (MLGM) for the vapor–liquid system in a strict correspondence to the thermodynamic Gibbs definition for any curvature of the boundary. It is shown that MLGM enables a calculation of molecular distributions in a layered model of the transition region of the interface with regard to the softness of a lattice structure. The state of coexisting phases must satisfy the Yang–Lee theory of condensation, and additional conditions for chemical, thermal, and mechanical equilibria are imposed on the properties of the transition region of an equilibrium droplet with any curvature in each layer. The new calculation procedure for the surface tension is compared with the existing calculation procedures for equilibrium and metastable droplets. A difference in size dependences of the surface tension σ(R) for equilibrium and metastable droplets with a radius R in vicinity of the line σ/σbulk = 1, where σbulk is the bulk surface tension, allows us to formulate the accuracy and reliability criterion for different modeling methods: if the mentioned line exceeds the calculation accuracy σ(R), then it indicates that the method does not correspond to the Gibbs definition.
- Published
- 2019
- Full Text
- View/download PDF
28. RELIABILITY CRITERION FOR CALCULATION OF THE OPTIMUM DRIVING SPEED ON ROAD IN WINTER
- Author
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Assel Tulebekova, Akmaral Sagybekova, Dauren Yessentay, and Tymarkul Muzdybayeva
- Subjects
Cement ,Environmental Engineering ,Ice formation ,Moisture ,business.industry ,Soil Science ,Building and Construction ,engineering.material ,Geotechnical Engineering and Engineering Geology ,Asphalt concrete ,Coating ,Road surface ,Air temperature ,Reliability criterion ,engineering ,Environmental science ,Geotechnical engineering ,business - Abstract
The problem of eliminating winter slips on paved roads is a topical issue today. The paper analyzes the results of tests using traditional (chloride) and non-traditional chemical reagents and their influence on the strength properties of cement concrete. In general, the formation of slipperiness on the surface of cement concrete pavements does not differ from asphalt concrete, because cement concrete can have a high moisture capacity. The pores of cement concrete readily allow moisture to penetrate, and with decreasing air temperature significant ice formation can occur in the pavement. This kind of slipperiness is very dangerous. In appearance they look like a dry coating, in fact, they penetrate deeply into the body of the coatings. Not every chemical reagent can act positively to reduce moisture. And also this process in climatic zones with a sharply continental climate especially exacerbates the likelihood of peeling of cement stone, followed by crumbling of concrete (peeling) and loss of strength due to the low stability of this material
- Published
- 2021
- Full Text
- View/download PDF
29. A new reliability evaluation under high penetration of wind power with V2G support.
- Author
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Han, Sekyung, Han, Soohee, and Sezaki, Kaoru
- Abstract
High penetration of intermittent wind power makes it more difficult to maintain the grid frequency hence requiring more energy storages. We propose a new probabilistic reliability criterion which can evaluate the impact of the wind power and the effect of the energy storages quantitatively in terms of the frequency regulation. During the formulation, load, wind power, and vehicle-to-grid (V2G) power are represented in a probabilistic manner. Then, the probability for successfully carrying out the frequency regulation, called FRFR, is derived utilizing both analytic and iterative numerical method. Using the derived reliability criterion, several simulations are performed. Firstly, the required amount of spinning reserve is specifically estimated with and without a certain amount of wind power proving the effectiveness of the suggested reliability criterion. Secondly, the possible penetration level of wind power is investigated under the support of various size of V2G power. Through the simulations, the usefulness of the V2G power for the frequency regulation is validated. [ABSTRACT FROM PUBLISHER]
- Published
- 2012
- Full Text
- View/download PDF
30. Global performance criterion of robotic manipulator with clearances based on reliability
- Author
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Didier Dumur, Fabian Andres Lara-Molina, Federal University of Technology - Paraná (UTFPR), Laboratoire des signaux et systèmes (L2S), and CentraleSupélec-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
- Subjects
0209 industrial biotechnology ,Computer science ,Mechanical Engineering ,Applied Mathematics ,General Engineering ,Robot manipulator ,Aerospace Engineering ,Control engineering ,02 engineering and technology ,Kinematics ,Workspace ,Performance index ,Industrial and Manufacturing Engineering ,[SPI.AUTO]Engineering Sciences [physics]/Automatic ,Computer Science::Robotics ,020901 industrial engineering & automation ,Automotive Engineering ,Reliability criterion ,Astrophysics::Galaxy Astrophysics ,Reliability (statistics) ,ComputingMilieux_MISCELLANEOUS ,ComputingMethodologies_COMPUTERGRAPHICS - Abstract
This paper presents a novel performance criterion applied to robotic manipulators based on kinematic reliability. The kinetostatic performance criteria have been used to quantify the effect of errors in the manipulators. Nevertheless, design criteria based on the kinematic errors produced by joint clearances have not been established. This contribution proposes a novel performance index based on kinematic reliability concepts that evaluates the effect of the kinematic error produced by clearances over a required workspace. The application of the proposed global kinematic reliability criterion is evaluated for serial and parallel manipulators.
- Published
- 2020
- Full Text
- View/download PDF
31. Robust Visual Tracking Based on Adaptive Multi-Feature Fusion Using the Tracking Reliability Criterion
- Author
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Jifang Li, Lin Zhou, Zhentao Hu, Yong Jin, Wei Qian, Li Junwei, and Han Wang
- Subjects
Computer science ,02 engineering and technology ,lcsh:Chemical technology ,01 natural sciences ,Biochemistry ,Article ,Analytical Chemistry ,Discriminative model ,Robustness (computer science) ,correlation filter ,0103 physical sciences ,Reliability criterion ,0202 electrical engineering, electronic engineering, information engineering ,lcsh:TP1-1185 ,Electrical and Electronic Engineering ,010301 acoustics ,Instrumentation ,business.industry ,Detector ,Pattern recognition ,feature tracking reliability criterion ,Atomic and Molecular Physics, and Optics ,Support vector machine ,adaptive feature fusion ,Video tracking ,visual object tracking ,Eye tracking ,multiple online detectors ,020201 artificial intelligence & image processing ,Artificial intelligence ,business - Abstract
Multi-resolution feature fusion DCF (Discriminative Correlation Filter) methods have significantly advanced the object tracking performance. However, careless choice and fusion of sample features make the algorithm susceptible to interference, leading to tracking failure. Some trackers embed the re-detection module to remedy tracking failures, yet distinguishing ability and stability of the sample features are scarcely considered when training the detector, resulting in low effectiveness detection. Firstly, this paper proposes a criterion of feature tracking reliability and conduct a novel feature adaptive fusion framework. The feature tracking reliability criterion is proposed to evaluate the robustness and distinguishing ability of the sample features. Secondly, a re-detection module is proposed to further avoid tracking failures and increase the accuracy of target re-detection. The re-detection module consists of multiple SVM detectors trained by different sample features. When the tracking fails, the SVM detector trained by the most reliable sample feature will be activated to recover the target and adjust the target position. Finally, comparison experiments on OTB2015 and UAV123 databases demonstrate the accuracy and robustness of the proposed method.
- Published
- 2020
32. Reliability, Criterion and Concurrent Validity of the Farsi Translation of DIVA-5: A Semi-Structured Diagnostic Interview for Adults With ADHD
- Author
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Elham Davoodi, Lida Zamani, Vandad Sharifi, Philip Asherson, Dora Wynchank, Javad Alaghband-Rad, Fatemeh Emari, Shadi Ansari, Zahra Shahrivar, J. J. Sandra Kooij, and Psychiatry
- Subjects
Adult ,Male ,Psychiatric Status Rating Scales ,Psychometrics ,Concurrent validity ,Diagnostic interview ,Reproducibility of Results ,Diva ,Diagnostic and Statistical Manual of Mental Disorders ,Clinical Psychology ,Young Adult ,Structured diagnostic interview ,Attention Deficit Disorder with Hyperactivity ,Reliability criterion ,Developmental and Educational Psychology ,Humans ,Female ,Self Report ,Psychology ,Reliability (statistics) ,Clinical psychology - Abstract
Objectives: This study evaluated the psychometrics of the Farsi translation of diagnostic interview for attention-deficit hyperactivity disorder (ADHD) in adults (DIVA-5) based on DSM-5 criteria. Methods: Referrals to a psychiatric outpatient clinic ( N = 120, 61.7% males, mean age 34.35 ± 9.84 years) presenting for an adult ADHD (AADHD) diagnosis, were evaluated using the structured clinical interviews for DSM-5 (SCID-5 & SCID-5-PD) and the DIVA-5. The participants completed Conner’s Adult ADHD Rating Scale-Self Report-Screening Version (CAARS-S-SV). Results: According to the SCID-5 and DIVA-5 diagnoses, 55% and 38% of the participants had ADHD, respectively. Diagnostic agreement was 81.66% between DIVA-5/SCID-5 diagnoses, 80% between SCID-5/CAARS-S-SV, and 71.66% between DIVA-5/CAARS-S-SV. Test–retest and inter-rater reliability results for the DIVA-5 were good to excellent. Conclusion: Findings support the validity and reliability of the Farsi translation of DIVA-5 among the Farsi-speaking adult outpatient population.
- Published
- 2020
- Full Text
- View/download PDF
33. Increasing the reliability of the electrical power supply in the Sochi Power Region.
- Author
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Adamokov, R. and Dolmatov, G.
- Abstract
Problems of developing a reliable power supply system for the Sochi power region which provides for the development of Sochi as a year-round mountain-climate resort of world standard and the growing export potential of Russia in the south and south-west areas, taking its future development into account, are considered. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
34. Optimal Sensor Placement Based on System Reliability Criterion Under Epistemic Uncertainty
- Author
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Yanni Lin, Tao Feng, and Rongxing Duan
- Subjects
Fault tree analysis ,0209 industrial biotechnology ,General Computer Science ,Computer science ,epistemic uncertainty ,General Engineering ,Sorting ,dynamic fault tree ,02 engineering and technology ,Interval (mathematics) ,021001 nanoscience & nanotechnology ,Fault (power engineering) ,Sensor placement ,reliability criterion ,Reliability engineering ,020901 industrial engineering & automation ,dynamic evidential network ,Logic gate ,General Materials Science ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,Uncertainty quantification ,0210 nano-technology ,lcsh:TK1-9971 ,Failure mode and effects analysis ,Event (probability theory) - Abstract
Fault diagnosis usually requires lots of data that are collected through sensors mounted on some locations in the system. Performance of a diagnostic system is largely dependent upon the number and locations of sensors. Accordingly, optimization of sensor placement has a significant influence on the efficiency of fault diagnosis. In this paper, a novel sensor placement based on a system reliability criterion is proposed, which aims to deal with the failure dependence and epistemic uncertainty. Specifically, it develops a dynamic fault tree (DFT) model to describe the dynamic failure behaviors based on failure mode and effects analysis and uses the interval numbers to express the failure rates of components. Furthermore, an indicator of sensor placement, named diagnostic importance factor (DIF), is calculated by mapping a DFT into a dynamic evidential network, and a sorting method based on the relative superiority degree is used to determine the potential locations according to DIF of components. In addition, the failure probability of the top event is considered as the criterion for sensor placement optimization and all scenarios of sensor placement are prioritized based on the criterion. Finally, the effectiveness of the proposed method is demonstrated via application to a real braking system.
- Published
- 2018
- Full Text
- View/download PDF
35. First Steps Towards Development of an Instrument for the Reproducible Quantification of Oropharyngeal Swallow Physiology in Bottle-Fed Children
- Author
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Maureen A. Lefton-Greif, Katlyn McGrattan, Bonnie Martin-Harris, Jeanne M. Pinto, Kathryn A. Carson, and Jennifer M. Wright
- Subjects
medicine.medical_specialty ,Video Recording ,Oropharynx ,Physiology ,Article ,03 medical and health sciences ,Speech and Hearing ,0302 clinical medicine ,Swallowing ,Modified Barium Swallow Impairment Profile ,030225 pediatrics ,Reliability criterion ,Content validity ,medicine ,Humans ,Child ,030223 otorhinolaryngology ,Reliability (statistics) ,business.industry ,Gastroenterology ,Reproducibility of Results ,Bottle fed ,Dysphagia ,Bottle Feeding ,Deglutition ,Otorhinolaryngology ,Fluoroscopy ,medicine.symptom ,Deglutition Disorders ,business - Abstract
The incidence of feeding/swallowing impairments (deglutition disorders) in young children is rising and poses serious acute and long-term health consequences. Accurate detection and prompt intervention can lessen the impact of dysphagia-induced sequelae. Videofluoroscopic Swallow Studies (VFSSs) are used to make critical decisions for medically fragile children despite procedural variability and the lack of agreed upon measures for interpreting and reporting results. This investigation represents the first steps in the development of a novel tool for the quantification of oropharyngeal swallow physiology from full-length VFSS examinations in bottle-fed children. The Modified Barium Swallow Impairment Profile MBSImP™© served as the conceptual assessment model for development of components and operational score variants to characterize distinguishable VFSS observations. Twenty-four components of swallowing physiology were validated via expert consensus. Training materials included a library of 94 digitized video images comprised of distinct score variants for each component. Materials were disseminated to seven speech-language pathologists (SLPs) who participated in didactic and self-training sessions, and rated components. All SLPs achieved ≥80% reliability criterion after completing two or three training sessions. Agreement for 17 (71%) components was achieved after two sessions. Nutritive sucking/oral and airway-related components were most difficult to distinguish. Three sessions were required for 2 (33%) of the sucking/oral components and 4 (57%) of the airway-related components. These findings support the feasibility to standardize training and reliably score swallowing physiology using precise definitions and unambiguous visual images, and represent preliminary steps towards content validity and reliability of a standardized VFSS tool for bottle-fed children.
- Published
- 2017
- Full Text
- View/download PDF
36. Voices of children and adolescents on phase 1 or phase 2 cancer trials: A new trial endpoint?
- Author
-
Pamela S. Hinds, Jichuan Wang, Shana Jacobs, Holly J. Meany, Yao Iris Cheng, Catherine Fiona Macpherson, Ruthanna Okorosobo, Claire Wharton, Heather E. Gross, and Emily Stern
- Subjects
Cancer Research ,medicine.medical_specialty ,030504 nursing ,business.industry ,Phases of clinical research ,Cancer ,medicine.disease ,Phase (combat) ,Clinical trial ,03 medical and health sciences ,0302 clinical medicine ,Oncology ,Quality of life ,030220 oncology & carcinogenesis ,Reliability criterion ,Physical therapy ,Medicine ,Incurable cancer ,0305 other medical science ,business ,Adverse effect - Abstract
BACKGROUND Pediatric participants on phase 1 or phase 2 clinical trials for incurable cancer are at risk of experiencing toxicities (adverse events [AEs]) related to trial participation. Multiple AEs are subjective; thus, the real impact of trial treatment cannot be known unless patient subjective reports are solicited. METHODS The authors assessed the feasibility and acceptability of soliciting symptom, function, and quality of life (QOL) reports from participants aged 8 to 18 years who were enrolled on phase 1/2 clinical trials at 4 cancer centers during the first course of chemotherapy. The authors also assessed the reliability and validity of 6 self-report Patient-Reported Outcomes Measurement Information System (PROMIS) pediatric measures and 4 open-ended interview questions at 2 time points (at the time of trial enrollment [T1] and 3 to 4 weeks later [T2]). RESULTS The enrollment rate of 75.9% (20 participants) exceeded the feasibility criterion, and missingness of measures by person, measure, and items at T1 and T2 were lower than the acceptability criteria. New QOL themes were limited to the impact of treatment on families and being away from home, family, and friends for treatment. All but one measure at T1 met the reliability criterion and all measures did so at T2. Validity support was limited however because as theorized, mobility decreased and fatigue increased as AEs increased. CONCLUSIONS Soliciting and documenting symptom, function, and QOL reports from patients aged 8 to 18 years who are enrolled on a phase 1/2 clinical trial is feasible and acceptable to participants, particularly when embedded in trials. Reliable and valid findings can result, making patient self-reported outcomes a possible new trial endpoint. Cancer 2017. © 2017 American Cancer Society.
- Published
- 2017
- Full Text
- View/download PDF
37. Reliable Power Grid Expansion Considering $N-1-1$ Contingencies
- Author
-
Jianhui Wang, José L. Duarte, Feng Qiu, Neng Fan, and Daniel A. Zuniga Vazquez
- Subjects
Mathematical optimization ,021103 operations research ,Computer science ,020209 energy ,0211 other engineering and technologies ,Economic dispatch ,Contingency management ,02 engineering and technology ,Electric power system ,Power system simulation ,Reliability criterion ,0202 electrical engineering, electronic engineering, information engineering ,State (computer science) ,Power grid ,Contingency - Abstract
The $N-1-1$ contingency consists of the consecutive loss of two components in a power system with intervening time for system adjustments between failures. This paper considers the expansion of an electric power system to achieve the $N-1-1$ reliability criterion with operation compliance check on unit commitment, economic dispatch, and power flow under contingency states. The resulting problem yields a very large-scale mixed-integer optimization model. For an efficient solution, a two-level Lagrangian Benders decomposition algorithm is adapted. The model and algorithm are evaluated on modified versions of several IEEE test systems with different contingency state combinations to confirm the proposed method's effectiveness.
- Published
- 2020
- Full Text
- View/download PDF
38. Comparison of reliability and geometrical strength criteria in geodetic networks.
- Author
-
Seemkooei, A. A.
- Abstract
The proper and optimal design and subsequent assessment of geodetic networks is an integral part of most surveying engineering projects. Optimization and design are carried out before the measurements are actually made. A geodetic network is designed and optimized in terms of high reliability and the results are compared with those obtained by the robustness analysis technique. The purpose of an optimal design is to solve for both the network configuration (first-order design) and observations accuracy (second-order design) in order to meet the desired criteria. For this purpose, an analytical method is presented for performing the first-order design, second-order design, and/or the combined design. In order to evaluate the geometrical strength of a geodetic network, the results of robustness analysis are displayed in terms of robustness in rotation, robustness in shear, and robustness in scale. Results showed that the robustness parameters were affected by redundancy numbers. The largest robustness parameters were due to the observations with minimum redundancy numbers. [ABSTRACT FROM AUTHOR]
- Published
- 2001
- Full Text
- View/download PDF
39. MODELING OF RELIABILITY OF LOGISTIC SYSTEMS OF URBAN FREIGHT TRANSPORTATION TAKING INTO ACCOUNT STREET CONGESTION
- Author
-
Viktor Vojtov, Olesya Kutiya, Natalija Berezhnaja, Mykola Karnaukh, and Oksana Bilyaeva
- Subjects
Operations research ,Computer science ,020209 energy ,media_common.quotation_subject ,freight transportation ,0211 other engineering and technologies ,Energy Engineering and Power Technology ,02 engineering and technology ,Industrial and Manufacturing Engineering ,reliability coefficient ,Management of Technology and Innovation ,021105 building & construction ,Reliability criterion ,lcsh:Technology (General) ,0202 electrical engineering, electronic engineering, information engineering ,lcsh:Industry ,Quality (business) ,Electrical and Electronic Engineering ,urban traffic jams ,Reliability (statistics) ,media_common ,Logistics center ,Applied Mathematics ,Mechanical Engineering ,Process (computing) ,Computer Science Applications ,Transportation distance ,Work (electrical) ,Control and Systems Engineering ,urban street network ,System information ,lcsh:T1-995 ,lcsh:HD2321-4730.9 ,route quality factor - Abstract
Mathematical formulation of the problem of forming urban freight transportation is performed. The structure of the system information model is developed, which takes into account material, energy and information flows. Mathematical expressions for calculating the criterion for choosing rational routes ‒ route quality factor are presented. The criterion takes into account the capabilities of the logistics center (information content), cargo weight, congestion (traffic jams), transportation distance and actual delivery time. A distinguishing feature is that it is determined online and takes into account the congestion dynamics of routes during a work shift. The dynamic model of delays in decision making in the logistics chains of urban freight transportation is developed. The model allows calculating the processing time of transportation requests and transportation time itself. It is shown that the total time of freight delivery consists of the travelling time of the vehicle, taking into account route resistance and delay time in all logistic chains of the system. The mathematical model is developed for assessing the reliability of urban freight transportation, taking into account street congestion. The model operates online and allows determining the parameters of the transport process, including traffic jams on city streets. The reliability criterion of the logistics system of urban freight transportation ‒ reliability coefficient is proposed. The criterion takes into account the travelling time of the vehicle and the delay time of receipt of transportation requests at the logistics center, and the time of delays at the transport company. It is shown that in the absence of delays in logistics chains, the reliability coefficient is equal to unity, and if there is a delay, the reliability coefficient is less than unity. The physical significance of the reliability criterion is determined. It is the share of non-fulfillment of transportation requests on time.
- Published
- 2019
40. Assessment of human factor in critical infrastructures
- Author
-
Poluyan, L. V., Malukova, M. G., Poluyan, L. V., and Malukova, M. G.
- Abstract
Methodology for assessing human error probability under emergency conditions, taking into account internal and external factors, the degree of uncertainty, which can influence the reliability of a "man-machine" system, is presented. A model based on the HRA (Human reliability analysis) methodology is used. Probability of a human error is determined, which combines the nominal error and the influence of environmental conditions. The error is compared to the rated (design) permissible critical value dependent on the system state. It enables steadily monitoring the technical state of the system. In case of an unsatisfactory state, correcting actions are performed and probability for a human error is again assessed as well as the extent of the system improvement is tested. The methodology uses reliability criteria taking into account the degree of human involvement into the process of controlling critical infrastructures. The methodology includes efficiency analysis and assessment of the safeguarding system with regard to the human factor. Currently, there is no special documentation setting the procedure of human behavior under emergency conditions by means of quantitative methods. The methodology can serve the purpose of developing a practical manual for people having to make decisions; it can be used in training the personnel for acting in emergency situations. It is useful for assessing the influence of human factor on operation of critical infrastructures used for various purposes. © 2019 Published under licence by IOP Publishing Ltd.
- Published
- 2019
41. Analysis of cyclic spontaneous switchings in GaN & SiC cascodes by snappy turn-off currents
- Author
-
Yasin Gunaydin, Saeed Jahdi, Avinash Aithal, Olayiwola Alatise, Jose Ortiz-Gonzalez, Phil Mellor, and Xibo Yuan
- Subjects
010302 applied physics ,Materials science ,business.industry ,020208 electrical & electronic engineering ,02 engineering and technology ,Condensed Matter Physics ,Gate voltage ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Inductance ,Turn off ,0103 physical sciences ,Reliability criterion ,0202 electrical engineering, electronic engineering, information engineering ,Optoelectronics ,Power semiconductor device ,Cascode ,Electrical and Electronic Engineering ,Power MOSFET ,Safety, Risk, Reliability and Quality ,business ,Diode - Abstract
This paper investigates the crosstalk-induced spontaneous switchings as continuous cycles of turn-on and turn-off transients as a key reliability criterion in SiC and GaN cascode power devices. The paper presents a wide range of measurements to describe the severity of unwanted switching cycles in presence of a few diodes with high turn-off dI/dt which results in a negative gate voltage induced by the source inductance. Modelling is performed which confirms the theory described to explain the root cause of the continued oscillatory transients and comparisons are made with standalone SiC power MOSFETs.
- Published
- 2020
- Full Text
- View/download PDF
42. Analysis of the power part architecture for short-medium-range aircraft control system with local hydraulic systems by reliability criterion
- Author
-
D Smagin, A Trofimov, and S Postnikov
- Subjects
Computer science ,Control system ,Medium range ,Reliability criterion ,Hydraulic machinery ,Architecture ,Reliability engineering ,Power (physics) - Abstract
This article provides a comparative analysis of the traditional control system power part for a short-medium-range aircraft with a control system power part with local HS. Comparison is based on the criterion of reliability. As initial data, statistics on the probability of failures of the electrical system and hydraulic system and actuators. The considered architecture of the control system power part with local HS fully complies with the required standards for the control system reliability given in regulatory documents, such as AR-25 and CS-25. The considered architecture of the control system power part with local HS is commensurate with the reliability of a typical version of the control system power part architecture. The considered architecture of the control system power part with local HS fully complies with the required standards for the control system reliability given in regulatory documents, such as AR-25 and CS-25. The considered architecture of the control system power part with local HS is commensurate with the reliability of a typical version of the control system power part architecture and in some cases it is an order of magnitude superior.
- Published
- 2020
- Full Text
- View/download PDF
43. Importance of reliability criterion in power system expansion planning
- Author
-
Damir Šljivac, Goran Slipac, and Mladen Zeljko
- Subjects
Control and Optimization ,Computer science ,020209 energy ,Energy Engineering and Power Technology ,02 engineering and technology ,security of supply ,lcsh:Technology ,Electric power system ,LOLP optimization ,VOLL, generation expansion planning ,reliability ,Reliability criterion ,0202 electrical engineering, electronic engineering, information engineering ,Electricity market ,Electrical and Electronic Engineering ,Engineering (miscellaneous) ,Reliability (statistics) ,lcsh:T ,Renewable Energy, Sustainability and the Environment ,business.industry ,Power capacity ,Power (physics) ,Reliability engineering ,VOLL ,020201 artificial intelligence & image processing ,Transmission system operator ,Electricity ,Security of supply ,business ,generation expansion planning ,Energy (miscellaneous) - Abstract
The self-sufficiency of a power system is no longer a relevant issue at the electricity market, since day-to-day optimization and security of supply are realized at the regional or the internal electricity market. Research connected to security of supply, i.e., having reliable power capacities to meet demand, has been conducted by transmission system operators. Some of the common parameters of security of supply are loss of load probability (LOLP) and/or loss of load expectation (LOLE), which are calculated by a special algorithm. These parameters are specific for each power system. This work presents the way of calculating LOLP as well as the optimization algorithm of LOLP, which takes into consideration the particularities of the power system. It also presents a difference in the treatment of LOLP regarding the observed power system and the necessary installed power capacity if applied to the calculated LOLP in relation to the optimized LOLP. As a conclusion, the study analyzed the parameters impact the regional electricity market&mdash, where the participants are countries with different development levels and various particularities of power systems&mdash, i.e., what it means when the same LOLP criterion is applied to them and the optimized LOLP.
- Published
- 2019
- Full Text
- View/download PDF
44. Planning of the Large-Scale Integrated Energy Systems
- Author
-
Xiaoxin Zhou, Z.X. Jing, Jiehui Zheng, and Q. H. Wu
- Subjects
Mathematical optimization ,Wind power ,Optimization problem ,Scale (ratio) ,Computer science ,business.industry ,Reliability criterion ,Evidential reasoning approach ,Interval (mathematics) ,business ,Investment (macroeconomics) ,Energy (signal processing) - Abstract
This chapter presents the planning problems of the LSIES considering the optimal unit sizing and the multi-stage contingency-constrained co-planning, respectively. First, a comprehensive framework including a multi-objective interval optimization model and evidential reasoning (ER) approach is introduced to solve the unit sizing problem of small-scale integrated energy systems, with uncertain wind and solar energies integrated. In the multi-objective interval optimization model, interval variables are introduced to tackle the uncertainties of the optimization problem. Aiming at simultaneously considering the cost and risk of a business investment, the average and deviation of life cycle cost (LCC) of the integrated energy system are formulated. Second, a multi-stage contingency-constrained co-planning for electricity-gas systems (EGS) interconnected with gas-fired units and power-to-gas (P2G) plants considering the uncertainties of load demand and wind power. The MCC model considers the long-term co-planning for EGS with the short-term operation constraints, while enabling systems to satisfy N-1 reliability criterion. These planning problems are solved utilizing the multi-objective optimization algorithms and decision-making support methods introduced in the previous chapters.
- Published
- 2019
- Full Text
- View/download PDF
45. Assessment of human factor in critical infrastructures
- Author
-
L. V. Poluyan and M. G. Malukova
- Subjects
UNCERTAINTY ANALYSIS ,Computer science ,Process (engineering) ,Human error ,ENVIRONMENTAL CONDITIONS ,Safeguarding ,ERRORS ,QUANTITATIVE METHOD ,Documentation ,BEHAVIORAL RESEARCH ,Safety engineering ,HUMAN ENGINEERING ,RELIABILITY ANALYSIS ,Reliability (statistics) ,Uncertainty analysis ,Human reliability ,EMERGENCY CONDITIONS ,HUMAN RELIABILITY ANALYSIS ,DEGREE OF UNCERTAINTY ,PERSONNEL TRAINING ,HUMAN ERROR PROBABILITY ,SAFETY ENGINEERING ,INTERNAL AND EXTERNAL FACTORS ,CRITICAL INFRASTRUCTURES ,Risk analysis (engineering) ,PUBLIC WORKS ,RELIABILITY CRITERION - Abstract
Methodology for assessing human error probability under emergency conditions, taking into account internal and external factors, the degree of uncertainty, which can influence the reliability of a "man-machine" system, is presented. A model based on the HRA (Human reliability analysis) methodology is used. Probability of a human error is determined, which combines the nominal error and the influence of environmental conditions. The error is compared to the rated (design) permissible critical value dependent on the system state. It enables steadily monitoring the technical state of the system. In case of an unsatisfactory state, correcting actions are performed and probability for a human error is again assessed as well as the extent of the system improvement is tested. The methodology uses reliability criteria taking into account the degree of human involvement into the process of controlling critical infrastructures. The methodology includes efficiency analysis and assessment of the safeguarding system with regard to the human factor. Currently, there is no special documentation setting the procedure of human behavior under emergency conditions by means of quantitative methods. The methodology can serve the purpose of developing a practical manual for people having to make decisions; it can be used in training the personnel for acting in emergency situations. It is useful for assessing the influence of human factor on operation of critical infrastructures used for various purposes. © 2019 Published under licence by IOP Publishing Ltd.
- Published
- 2019
46. Methods for broadband signals mutual time delays estimating enhancement
- Author
-
O. A. Morozov and Ilya V. Grin
- Subjects
Time delays ,Narrowband ,Ambiguity function ,lcsh:T58.5-58.64 ,Computer science ,lcsh:Information technology ,Broadband ,Reliability criterion ,Algorithm - Abstract
This paper considers methods for estimating the mutual time delay of broadband signals recorded by satellites based multi-position systems for determining the location of a radiation source. All methods considered are based on modified algorithms for calculating the ambiguity function. The presented algorithms are based on the extraction of narrowband channels from the studied signals and their further optimal processing. The reliability criterion for mutual time delay estimation by the presented methods was evaluated. Based on the results and analysis of computational efficiency, viability of methods considered and their modifications was determined.
- Published
- 2019
47. Optimal Electricity Transmission Reliability: Going Beyond the N-1 Criterion
- Author
-
Stef Proost and Marten Ovaere
- Subjects
Technology ,Economics and Econometrics ,Energy & Fuels ,Economics ,Computer science ,020209 energy ,Environmental Studies ,POWER ,Transmission Investment ,Social Sciences ,SUPPLY SECURITY ,Environmental Sciences & Ecology ,02 engineering and technology ,CAPACITY ,Margin (machine learning) ,Business & Economics ,Reliability criterion ,0202 electrical engineering, electronic engineering, information engineering ,Electricity Transmission Reliability ,Reliability (statistics) ,Science & Technology ,business.industry ,COST ,N-1 reliability criterion ,FRAMEWORK ,Investment (macroeconomics) ,Reliability engineering ,Renewable energy ,Variable (computer science) ,General Energy ,Electric power transmission ,Transmission (telecommunications) ,Reliability Management ,business ,Life Sciences & Biomedicine ,SYSTEM - Abstract
In the presence of transmission outages, uncertain demand and variable renewable supply, network operators keep a reliability margin to avoid interruptions and black-outs. The reliability margin is presently determined by the N-1 reliability criterion. Our analytical model defines the optimal reliability margin by balancing congestion costs and interruption costs. This leads to more efficient use of transmission capacity and to smaller investment needs than with the N-1 criterion. A numerical illustration shows the net benefits of the new reliability criterion.
- Published
- 2018
- Full Text
- View/download PDF
48. Genomic selection in a commercial winter wheat population
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Yusheng Zhao, Viktor Korzun, Yong Jiang, Sang He, Albert W. Schulthess, Vilson Mirdita, Erhard Ebmeyer, Reiner Bothe, and Jochen C. Reif
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0106 biological sciences ,0301 basic medicine ,Genotype ,Population ,Winter wheat ,Genomics ,Breeding ,Biology ,01 natural sciences ,03 medical and health sciences ,Reliability criterion ,Statistics ,Genetics ,Additive genetic effects ,Selection, Genetic ,education ,Triticum ,Selection (genetic algorithm) ,education.field_of_study ,Models, Genetic ,business.industry ,Reproducibility of Results ,Agriculture ,General Medicine ,Biotechnology ,Phenotype ,030104 developmental biology ,Epistasis ,business ,Agronomy and Crop Science ,Genomic selection ,010606 plant biology & botany - Abstract
Genomic selection models can be trained using historical data and filtering genotypes based on phenotyping intensity and reliability criterion are able to increase the prediction ability. We implemented genomic selection based on a large commercial population incorporating 2325 European winter wheat lines. Our objectives were (1) to study whether modeling epistasis besides additive genetic effects results in enhancement on prediction ability of genomic selection, (2) to assess prediction ability when training population comprised historical or less-intensively phenotyped lines, and (3) to explore the prediction ability in subpopulations selected based on the reliability criterion. We found a 5 % increase in prediction ability when shifting from additive to additive plus epistatic effects models. In addition, only a marginal loss from 0.65 to 0.50 in accuracy was observed using the data collected from 1 year to predict genotypes of the following year, revealing that stable genomic selection models can be accurately calibrated to predict subsequent breeding stages. Moreover, prediction ability was maximized when the genotypes evaluated in a single location were excluded from the training set but subsequently decreased again when the phenotyping intensity was increased above two locations, suggesting that the update of the training population should be performed considering all the selected genotypes but excluding those evaluated in a single location. The genomic prediction ability was substantially higher in subpopulations selected based on the reliability criterion, indicating that phenotypic selection for highly reliable individuals could be directly replaced by applying genomic selection to them. We empirically conclude that there is a high potential to assist commercial wheat breeding programs employing genomic selection approaches.
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- 2016
- Full Text
- View/download PDF
49. Reliability-based layout design of sewage collection systems in flat areas
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Amin E. Bakhshipour and Ali Haghighi
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Scheme (programming language) ,Engineering ,business.industry ,Page layout ,0208 environmental biotechnology ,Geography, Planning and Development ,Sewage ,02 engineering and technology ,computer.software_genre ,020801 environmental engineering ,Reliability engineering ,Reliability criterion ,Simulated annealing ,Systems design ,Upstream (networking) ,business ,computer ,Reliability (statistics) ,Water Science and Technology ,computer.programming_language - Abstract
The sewer layout in flat areas significantly influences the final design which is desired to be optimized for the construction and operational costs. This study introduces a model for designing the layout of sewer networks considering their reliability. A reliability criterion is introduced and optimized using a simple simulated annealing scheme. The best layout with the maximum reliability represents an optimum sewer layout in which clogging in a sewer has the least effect on its upstream lines. A case study is solved using the proposed model. Then, for the obtained layout, the sewer specifications are designed using a dynamic programming model. The reliability somehow reflects the operational costs that can be taken into account in the system design by the proposed model. Furthermore, it is concluded that the network's reliability and construction cost are in conflict with each other such that more reliable layouts lead to more expensive designs.
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- 2015
- Full Text
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50. Analytical Reliability Analysis of 3D NoC under TSV Failure
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Ashkan Eghbal, Misagh Khayambashi, Nader Bagherzadeh, and Pooria M. Yaghini
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Single chip ,Engineering ,Network geometry ,SIMPLE (military communications protocol) ,business.industry ,Monte Carlo method ,Failure probability ,Hardware_PERFORMANCEANDRELIABILITY ,Reliability engineering ,Hardware and Architecture ,Reliability criterion ,Scalability ,Hardware_INTEGRATEDCIRCUITS ,Electrical and Electronic Engineering ,business ,Software ,Reliability (statistics) - Abstract
The network-on-chip (NoC) technology allows for integration of a manycore design on a single chip for higher efficiency and scalability. Three-dimensional (3D) NoCs offer several advantages over two-dimensional (2D) NoCs. Through-silicon via (TSV) technology is one of the candidates for implementation of 3D NoCs. TSV reliability analysis is still challenging for 3D NoC designers because of their unique electrical, thermal, and physical characteristics. After providing an overview of common TSV issues, this article aims to define a reliability criterion for NoC and provide a framework for quantifying this reliability as it relates to TSV issues. TSV issues are modeled as a time-invariant failure probability. Also, a reliability criterion for TSV-based NoC is defined. The relationship between NoC reliability and TSV failure is quantified. For the first time, the reliability criterion is reduced to a tractable closed-form expression that requires a single Monte Carlo simulation. Importantly, the Monte Carlo simulation depends only on network geometry. To demonstrate our proposed method, the reliability criterion of a simple 8×8×8 NoC supported by an 8×8×7 network of TSVs is calculated.
- Published
- 2015
- Full Text
- View/download PDF
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