Academic literature on the topic 'Grouping Configuration'
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Journal articles on the topic "Grouping Configuration"
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Ma-Wyatt, Anna, Colin W. G. Clifford, and Peter Wenderoth. "Contrast Configuration Influences Grouping in Apparent Motion." Perception 34, no. 6 (June 2005): 669–85. http://dx.doi.org/10.1068/p3444.
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We investigated whether the same principles that influence grouping in static displays also influence grouping in apparent motion. Using the Ternus display, we found that the proportion of group motion reports was influenced by changes in contrast configuration. Subjects made judgments of completion of these same configurations in a static display. Generally, contrast configurations that induced a high proportion of group motion responses were judged as more ‘complete’ in static displays. Using a stereo display, we then tested whether stereo information and T-junction information were critical for this increase in group motion. Perceived grouping was consistently higher for same contrast polarity configurations than for opposite contrast polarity configurations, regardless of the presence of stereo information or explicit T-junctions. Thus, while grouping in static and moving displays showed a similar dependence on contrast configuration, motion grouping showed little dependence on stereo or T-junction information.
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Overvliet, Krista E., Kim Verlaers, Ralf T. Krampe, and Johan Wagemans. "The effect of perceptual grouping on haptic numerosity perception." Seeing and Perceiving 25 (2012): 183. http://dx.doi.org/10.1163/187847612x648134.
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In order to investigate the effect of perceptual grouping on haptic numerosity perception, we asked participants to explore tangible dot patterns and report the number of dots present in the display. We hypothesized that when there are subsets of dots that can be grouped together, exploration time will be shorter as compared to a display where no grouping takes place. The base display consists of dots that are equally spaced on a straight line. We manipulated subset grouping by using both proximity and configurational cues. By placing subsets of dots closer together or placing them in a spatial configuration (e.g., in a triangular shape with three dots, or a rectangular shape with four dots), while keeping the total exploration distance constant, we expected to find shorter exploration times as compared to the base display. The results indeed show that both these cues yield faster exploration. We therefore conclude that both proximity and configurational information can influence haptic grouping for numerosity judgments.
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Lehar, S. "Generalised Model of Illusory Grouping Accounts for Collinear, Orthogonal, and Vertex Grouping Percepts." Perception 25, no. 1_suppl (August 1996): 91. http://dx.doi.org/10.1068/v96l0704.
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A number of illusory phenomena, for example the Kanizsa illusion, exhibit boundary completion by collinearity between visible inducing edges. These phenomena have been addressed by models such as Grossberg's boundary contour system (BCS) (1985 Psychological Review92 173 – 211), which incorporates collinearity cells with receptive fields specialised to detect and enhance collinearity. Other illusory phenomena like the Ehrenstein illusion exhibit boundary completion orthogonal to the oriented inducers. The BCS model explains such orthogonal grouping by disinhibition, due to competition between collinearity cells of orthogonal orientations. There are many illusory grouping phenomena, however, which exhibit boundary completion through sharp corners in a variety of configurations, producing illusory ‘V’ or ‘Y’ vertices. Examples are seen in the diamond percept of the four-line Ehrenstein illusion, the triangular grouping percept of three dots arranged in a triangular configuration, as well as in the hexagonal percept of a grid of dots in a honeycomb pattern. These completions cannot be explained by models based on collinearity. Lehar's orientational harmonic model (1994, PhD thesis, Boston University) offers a single generalised grouping mechanism capable of collinear, orthogonal, and sharp vertex grouping. The proposed mechanism is a harmonic resonance, or pattern of standing waves in the orientational representation which promotes orientational periodicity. Computer simulations show that the model can account for a large number of diverse illusory phenomena using a single simple mechanism, and predicts the specific conditions under which a grouping of one type yields to a different grouping type.
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KIM, Young-Beom. "On the Optimal Configuration of Grouping-Based Framed Slotted ALOHA." IEICE Transactions on Information and Systems E101.D, no. 11 (November 1, 2018): 2823–26. http://dx.doi.org/10.1587/transinf.2018edl8093.
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Jin, Yan, Kee Wook Rim, Kee Cheon Kim, and Min Wei. "A Multi-Hop Grouping Scheme for Assisting Handoff Procedure in Vehicular Networks." Applied Mechanics and Materials 121-126 (October 2011): 3719–25. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.3719.
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The duplicate address detection (DAD) has been a time-costly and a bottleneck in IP address configuration. The dynamic host configuration protocol (DHCP) was proposed and adopted to effectively assign unique address to a host. However, DHCP is not suitable for networks with a large number of nodes, and address renumbering under DHCP would be much more complicated than that under stateless auto-configuration. In vehicular networks, moving vehicles get connected to the Internet through the access point set up by the road. The handoff operation is supposed to happen frequently due to the fast moving of vehicles. Therefore, the performance of handoff becomes one of the most important issues to maintain seamlessly connection to the Internet in vehicular environment. In this paper, we propose a multi-hop group assisted handoff algorithm to effectively reduce handoff latency for avoiding the impact of time-consuming from IP configuration operation.
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Li, Jixing, Tao Ning, Tian Wang, Bifu Hu, Ping Xi, and Jingliang Xu. "A rapid parameter configuration method for film hole component in pipe-net calculation." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 7 (November 27, 2019): 915–33. http://dx.doi.org/10.1177/0957650919889454.
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Film hole component is one of the most important cooling components in pipe-net calculation for blade design. However, owing to a large number of gas film holes, manual parameter configuration for film hole components will affect the efficiency of pipe-net calculation. Extracting parameters from the geometric structure of film holes automatically could significantly shorten the time consumption of pipe-net calculation. In this paper, numeric analysis parameter and group data required by film hole components were summarized and analyzed, based on which a parameter configuration strategy was proposed. Aiming at the extraction of group data, a film hole grouping method was presented. By converting the grouping requirements in fluid-heat analysis into a geometric row pattern recognition problem, it further redefines the geometric row as a linear distribution by a projection method and a parametric mapping method and finally solves the grouping problem by a linear search algorithm. A numeric parameter extraction method was put forward to redefine analysis parameters with geometric properties and identify certain geometry primitives. The proposed algorithm and method are verified with instances. The results illustrate that our method could shorten parameter configuration process of film hole component into several minutes from several hours in manual, with more reliable accuracy.
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Quek, Genevieve L., and Marius V. Peelen. "Contextual and Spatial Associations Between Objects Interactively Modulate Visual Processing." Cerebral Cortex 30, no. 12 (August 5, 2020): 6391–404. http://dx.doi.org/10.1093/cercor/bhaa197.
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Abstract Much of what we know about object recognition arises from the study of isolated objects. In the real world, however, we commonly encounter groups of contextually associated objects (e.g., teacup and saucer), often in stereotypical spatial configurations (e.g., teacup above saucer). Here we used electroencephalography to test whether identity-based associations between objects (e.g., teacup–saucer vs. teacup–stapler) are encoded jointly with their typical relative positioning (e.g., teacup above saucer vs. below saucer). Observers viewed a 2.5-Hz image stream of contextually associated object pairs intermixed with nonassociated pairs as every fourth image. The differential response to nonassociated pairs (measurable at 0.625 Hz in 28/37 participants) served as an index of contextual integration, reflecting the association of object identities in each pair. Over right occipitotemporal sites, this signal was larger for typically positioned object streams, indicating that spatial configuration facilitated the extraction of the objects’ contextual association. This high-level influence of spatial configuration on object identity integration arose ~ 320 ms post-stimulus onset, with lower-level perceptual grouping (shared with inverted displays) present at ~ 130 ms. These results demonstrate that contextual and spatial associations between objects interactively influence object processing. We interpret these findings as reflecting the high-level perceptual grouping of objects that frequently co-occur in highly stereotyped relative positions.
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Khalili, A., and D. K. Chua. "Integrated Prefabrication Configuration and Component Grouping for Resource Optimization of Precast Production." Journal of Construction Engineering and Management 140, no. 2 (February 2014): 04013052. http://dx.doi.org/10.1061/(asce)co.1943-7862.0000798.
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Bukhteyeva, I. V., and S. L. Petukhov. "Efficiency improvement of automatic assembly in automotive and tractor engineering." Traktory i sel hozmashiny 82, no. 5 (May 15, 2015): 48–51. http://dx.doi.org/10.17816/0321-4443-65482.
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Results of selecting of optimal number of technological equipment for the automatic assembly of gearboxes are given. A method for items grouping is presented; selecting of optimal configuration of flexible assembly system is substantiated mathematically.
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Zou, Wei, Danfeng Hu, Xin Gao, and Jiajun Wang. "A reconstruction method for diffuse optical tomography by grouping of source-detector configuration." Journal of Modern Optics 64, no. 7 (November 23, 2016): 771–76. http://dx.doi.org/10.1080/09500340.2016.1260780.
Full textDissertations / Theses on the topic "Grouping Configuration"
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Brooks, Kathryn A. "In search of academic voice : the impact of instructional grouping configurations on English language learner academic language production." Diss., Manhattan, Kan. : Kansas State University, 2006. http://hdl.handle.net/2097/238.
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Lin, Jhih-Wei, and 林志韋. "Low-complexity ABS Configuration and User Grouping Strategies in Heterogeneous Networks with Proportional Fairness." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/85568296156484940235.
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碩士國立中央大學
通訊工程學系
101
In this thesis, the problem for maximizing the system sum rate in heterogeneous networks (HetNet) is considered. HetNet layout including macro eNodeBs and some low-power nodes are considered as a key scenario in LTE-Advanced. The major problem in HetNet is the co-channel inter-cell interference because the spectrum is shared between all eNBs. In order to resolve the interference problem, the utilization of almost blank subframes (ABS) in time domain enhanced inter-cell interference coordination (eICIC) is introduced. The main feature of time domain eICIC is that some subframes are only allowed to be used by some particular user equipment (UEs). Therefore, eICIC makes the resource allocation problem difficult and different from conventional resource allocation problems. The main challenges of the resource allocation problem in this thesis include the configuration of ABS pattern and the resource allocation for macro UEs and pico UEs. The first part of this thesis introduces an ABS pattern design by using the channel characteristic, which is developed in the view of time domain. After ABS pattern is configured, the second part of this thesis develops a UE grouping strategy based on the standard Lagrangian technique to determine which pico UEs use the protected or normal subframes having co-channel inter-cell interference. Besides, the issue of proportional fairness among UEs is also studied. The resource allocation problem in the view of frequency domain is considered, especially for pico UEs. The assignment of resource blocks is developed based on the fairness among UEs. The proposed schemes take the system performance and the fairness into account, and has lower complexity compared to the full search algorithm. Simulation results also reveal that the proposed schemes outperform the existing algorithms.
Books on the topic "Grouping Configuration"
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Galmonte, Alessandra, and Tiziano Agostini. The Reversed Contrast Necker Cube. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780199794607.003.0043.
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Agostini and Galmonte reported a configuration showing that when grouping factors are optimized, a grey target totally surrounded by black appears darker than an equal grey target totally surrounded by white. This is called the simultaneous contrast. The theoretical assumption is that, when higher-level factors act simultaneously with lower-level factors, the former prevails over the latter. Specifically, it is assumed that the lightness induction produced by the global organization principle of perceptual belongingness prevails over retinal lateral inhibition. A reversed contrast Necker cube display with two middle grey dashed cubes is used to illustrate the effect. The first one had dark inducer corners and was placed on a light inducer background, and the second one, which had light inducer corners, was placed on a dark inducer background.lightness induction, grouping, perceptual belongingness, lateral inhibition, organization principles
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Andreoni, Antonio, Pamela Mondliwa, Simon Roberts, and Fiona Tregenna, eds. Structural Transformation in South Africa. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192894311.001.0001.
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Taking South Africa as an important case study of the challenges of structural transformation, the book offers a new micro-meso level framework and evidence linking country-specific and global dynamics of change, with a focus on the current challenges and opportunities faced by middle-income countries. Detailed analyses of industry groupings and interests in South Africa reveal the complex set of interlocking country-specific factors which have hampered structural transformation over several decades, but also the emerging productive areas and opportunities for structural change. The structural transformation trajectory of South Africa presents a unique country case, given its industrial structure, concentration, and highly internationalized economy, as well as the objective of black economic empowerment. The book links these micro-meso dynamics to the global forces driving economic, institutional, and social change. These include digital industrialization, global value-chain consolidation, financialization, and environmental and other sustainability challenges which are reshaping structural transformation dynamics across middle-income countries like South Africa. While these new drivers of change are disrupting existing industries and interests in some areas, in others they are reinforcing existing trends and configurations of power. The book analyses the ways in which both the domestic and global drivers of structural transformation shape—and, in some cases, are shaped by—a country’s political settlement and its evolution. By focusing on the political economy of structural transformation, the book disentangles the specific dynamics underlying the South African experience of the middle-income country conundrum. In so doing, it brings to light the broader challenges faced by similar countries in achieving structural transformation via industrial policies.
Book chapters on the topic "Grouping Configuration"
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Armillas-Tiseyra, Magalí. "Marvelous Autocrats." In The Global South Atlantic. Fordham University Press, 2017. http://dx.doi.org/10.5422/fordham/9780823277872.003.0010.
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This essay shows how the idea of the South Atlantic as a space of dictatorships and banana republics was contested on the ground by literary experimentation and transoceanic influence. Armillas- Tiseyra uses Sony Labou Tansi’s La vie et demie (Life and a Half 1979) as an example of a dictator novel, a genre that spans the Global South. Armillas-Tiseyra argues for the term “constellation” to be used in place of “magical realism” to classify the genre. “Constellation” here serves as a figure both for the relationship of individual texts or textual features to each other (a loose configuration or grouping) and for a mode of comparison that proceeds by juxtaposition and collage rather than more rigid hierarchical systematization. The allows Armillas-Tiseyra to approach and grapple with the difficult relationship between critique and narrative form.
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Garai, Jozsef. "Nuclear Lattice Model and the Electronic Configuration of the Chemical Elements." In Mendeleev to Oganesson. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190668532.003.0005.
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In the earliest days of science researchers were arguing philosophically what might be the reasonable explanation for an observed phenomenon. The majority of the contemporary scientific community claims that these arguments are useless because they do not add anything to our understanding of nature. The current consensus on the aim of science is that science collects facts (data) and discerns the order that exists between and among the various facts (e.g., Feynman 1985). According to this approach the mission of science is over when the phenomenon under investigation has been described. It is left to the philosophers to answer the question what is the governing physical process behind the observed physical phenomenon. Quantum mechanics is a good example of this approach, “It works, so we just have to accept it.” The consequence is that nearly 90 years after the development of quantum theory, there is still no consensus in the scientific community regarding the interpretation of the theory’s foundational building blocks (Schlosshauer et al. 2013). I believe that identifying the physical process governing a natural phenomenon is the responsibility of science. Dutailly (2013) expressed this quite well: A “black box” in the “cloud” which answers our questions correctly is not a scientific theory, if we have no knowledge of the basis upon which it has been designed. A scientific theory should provide a set of concepts and a formalism which can be easily and indisputably understood and used by the workers in the field. In this study the main unifying principle in chemistry, the periodic system of the chemical elements (PSCE) is investigated. The aim of the study is not only the description of the periodicity but also the understanding of the underlying physics resulting in the PSCE. By 1860 about 60 elements had been identified, and this initiated a quest to find their systematic arrangement. Based on similarities, Dobereiner (1829) in Germany suggested grouping the elements into triads.
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Rogoff, Barbara, and Leslee Bartlett. "Lessons about Learning as a Community." In Learning Together. Oxford University Press, 2001. http://dx.doi.org/10.1093/oso/9780195097535.003.0003.
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Throughout the past century, U.S. parents, scholars, and educators have debated how to help children learn in schools. This book contributes to the discussion by presenting ideas about how children can learn in a community organized to foster their learning. Our ideas stem from participation in an innovative public school that prioritizes instruction that builds on children’s interests in a collaborative way, where learning activities are planned by children as well as adults, and where parents and teachers not only foster children’s learning but also learn from their involvement with the children. Despite some notable experiments to make changes in formal school instruction, the routines of U.S. schooling have remained quite stable across the past century, with the following characteristics: . . . • Being compulsory for all children . . . . . . • Segregating children from the daily activities of the adults in their community . . . . . . • Isolating several dozen children with a single adult charged with their instruction . . . . . . • Grouping children according to their birthdates to provide large numbers of children with standard instruction in a step-by-step fashion . . . . . . • Isolating skills from their integrated use in productive activities . . . . . . • Attempting to motivate children by grading their performance . . . The familiarity of these aspects of schooling have led many adults to assume that these characteristics are necessary to learning in general. It is natural to take for granted the accustomed ways of doing things. As people continue to search for arrangements that communities can use to foster the next generation’s development, efforts to try different arrangements to aid children’s learning are very important, especially as times change. The particular form taken by U.S. schools in the 1900s is only one configuration of possible solutions to the question of how to help children learn the skills that they will need as they mature. Formal, compulsory schooling is a brief experiment in the history of human learning.
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Puetter, Uwe. "4. The Council of the European Union:." In The Institutions of the European Union, 78–105. Oxford University Press, 2021. http://dx.doi.org/10.1093/hepl/9780198862222.003.0004.
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The Council is an institution of day-to-day policymaking in which the interests of member state governments are represented by cabinet ministers who meet, according to their policy portfolio, in different Council configurations and within the Eurogroup. According to the Treaty of Lisbon, the Council has a dual mandate. It acts as a legislative organ as well as an executive and policy-coordinating institution. This dual role is reflected in the organization and meeting practices of the different Council configurations. Those groupings of ministers dealing primarily with executive decisions and policy coordination tend to meet more often and are regarded as being more senior than those formations of the Council which engage predominantly in legislative decision-making. As a legislative institution, the Council has increasingly acquired features of an upper chamber in a bicameral separation of powers system, working in tandem with the European Parliament. In contrast, Council decision-making relating to executive issues and policy coordination in important policy domains, such as economic governance and foreign policy, is closely aligned with the European Council. In these areas, the Council can be considered to constitute, together with the Commission, a collective EU executive.
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Ostlie, Dale A. "An Overview of the Solar System." In Astronomy: The Human Quest for Understanding, 358–78. Oxford University PressOxford, 2022. http://dx.doi.org/10.1093/oso/9780198825821.003.0010.
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Abstract An Overview of the Solar System presents a brief survey of what our tiny region of space contains. The principal goal of the chapter is to give the reader an organizational framework for the study of our Solar System. The patterns that are exposed suggest that underlying evolutionary processes must have led to the Solar System’s current configuration. A secondary goal is to provide the reader with a quick introduction to the Solar System, should they choose to move directly to a study of interstellar space, stars, galaxies, the cosmic web, and cosmology. The groupings of the innermost rocky planets, the asteroid belt, the gas giants, and the more distant ice giants are reviewed along with the class of dwarf planets. The origins of comets from the Kuiper belt and the Oort Cloud, and meteoroids are also discussed. A discussion of the general importance of tidal interactions concludes the chapter.
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Saonee, Saonee, Joseph S. Valacich, and Suprateek Sarker. "Virtual Team Trust." In Advances in Information Resources Management, 218–41. IGI Global, 2004. http://dx.doi.org/10.4018/978-1-59140-253-4.ch010.
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Trust is a major factor influencing the cohesiveness among virtual team members. While recent research in the fields of information systems and management has examined this construct, there are no existing instruments that measure all the different bases of trust. Drawing on the literature, three different bases of trust applicable to virtual teams have been identified: personality-based, institutional-based, and cognitive trust, with cognitive trust further subdivided into three dimensions: stereotyping, unit grouping, and reputation categorization. This chapter reports on the development of an instrument to capture these three bases of trust. Using exploratory, and thereafter, confirmatory factor analysis, the instrument is validated, and the psychometric properties of the construct(s) are verified in the context of U.S.-Canadian student virtual teams engaged in systems development projects. In addition to confirming the conceptual bases of trust, the instrument validation process found that stereotyping in virtual teams can be of three distinct types: message-based, physical appearance/behavior-based, and technology-based. The development and validation of this instrument should enable future researchers to measure virtual team trust in a broad range of technology and team configurations.
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Perrone, Christian. "SDO-SuRS Deployable Assets Program." In Progress in Marine Science and Technology. IOS Press, 2022. http://dx.doi.org/10.3233/pmst220077.
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ITA Navy has started a new program for the acquisition of a Naval Vessel called SDO-SuRS (Special and Diving Operation – Submarine Rescue Ship). In order to fulfill operational requirements, IT Navy has recently procured the so-called “SDO-SuRS Deployable Assets”. A temporary business grouping (RTI) between SAIPEM Spa (leader in robotics and offshore) and DRASS Srl (national excellence in the hyperbaric sector and rescue) is the enterprise selected for the scope. This grouping represents a national excellence and a technological reference point for IT Navy in the Submarine Escape and Rescue. The new SDO-SuRS Deployable assets will have specific peculiarities such as: modularity, deployability, interoperability and complementarity. Modular assets will be either installable on board the national mother ship SDO-SuRS or rapidly deployable in scalable configurations (from rapid intervention to deep rescue) on a vessel of opportunity, military or commercial, for far-from-home operations. In order to establish a framework on damaged submarines rescue’s topic between Countries within ISMERLO (International Submarine Escape and Rescue Liaison Office) and NATO organizations, Italy offers the opportunity of providing any type of technical-administrative support in design, procurement, Life Management System or training of SAIPEM – DRASS systems, useful to a potential cooperation in the Submarine Escape and Rescue. On the whole the above mentioned Submarine Rescue packages consist of a several assets as follow: ∙ Submarine Rescue Vehicle (SRV) tethered type composed by a Rescue Chamber and a WROV (Working Class Remote Operated Vehicle) which will be managed both aboard the SDO-SuRS ship (Mother Ship) and aboard the Vessel of Opportunity. The system has to be designed/realized to perform the search and rescue of DISSUB as well as the transfer of crew inside the Diving Decompression Chamber. ∙ Portable Launch and Recovery System (PLARS) to permit the Launch/Recovery of SRV/SRC and WROV; ∙ Diving Decompression Chambers (DDC) with TUP (Transit Under Pressure) to face a specific sanitary treatment which could involve the submarine’s crew; ∙ Ventilation System (VS) by means of which will be possible the change of dirty air inside of the distressed submarine as well as the air insufflation to main ballast tanks; ∙ Submarine Rescue Chamber (SRC); ∙ Working Class Remote Operated Vehicle (WROV) able to perform underwater work and completely redundant with the WROV associated to SRV.
Conference papers on the topic "Grouping Configuration"
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Weinstein, Marc, and Souran Manoochehri. "Mold Tool Configuration to Minimize Undercuts." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0020.
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Abstract This paper presents a methodology for obtaining mold configurations, defined by cavity and core geometries, with a minimum number of undercuts in a molded part. The methodology identifies optimal draw directions and associated parting line locations that minimize the number of undercuts thereby obtaining a good mold configuration. The interaction of the allowable draw ranges of the concave regions of the part determines the allowable draw direction range for the part. The allowable draw range for each concave region depends on how the constituent surfaces are grouped. This grouping determines whether the surfaces are formed by one or two mold halves, depending on the draw direction. The grouping also identifies which surfaces, if any, form an undercut regardless of draw direction. This last grouping identifies which surfaces require modification so that either a side core or a mold halves can form the surfaces. The allowable draw direction range for the part and its interaction with surfaces within the convex region defines the parting line location for the part. Once the draw ranges and parting line locations are identified, an algorithm selects the optimum draw direction and parting line location that minimizes the number of undercuts and results in a mold that is easy to make.
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Vegh, J., and Andrew Milligan. "Revisiting Legacy Weight Relationships Using Machine Learning Techniques." In Vertical Flight Society 78th Annual Forum & Technology Display. The Vertical Flight Society, 2022. http://dx.doi.org/10.4050/f-0078-2022-17494.
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This paper investigates the application of K-Means Clustering algorithms to traditional aircraft conceptual-level weight estimation techniques. As a proof of concept demonstration, application was narrowed to fuselage basic weight estimation with expansion to additional component weights as a planned follow on activity. A variety of weight sources were parsed and curated to produce a large, diverse dataset consisting of 82 separate aircraft with a corresponding new universal baseline regression to compare against. A K-Means Clustering algorithm was then employed that sorted aircraft into groupings based on configuration as well as topology and created an associated regression for each grouping. Configuration-based groupings utilized information such as a high-level abstraction of the structural layout as well as whether the aircraft is a fixed-wing or rotary-wing vehicle. Topology-cased groupings utilized information such as landing gear location and possession of a cargo ramp or wing. The configuration-based groupings showed modest improvement compared to the baseline regression while the topology-based groupings consistently outperformed both the baseline regression as well as the configuration-based regressions. Under all conditions, a subset of the data associated with fixed-wing aircraft was shown to be an outlier in regards to error as a result of a large range of weight and speed scales, as well as possible secondary pressurization impacts. Special treatment of the winged dataset led to further reduction in error based on unique design features, presenting an overall fuselage weight estimation methodology that leverages machine learning algorithms that can improve and inform existing best practices.
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Cai, Ningxu, Lihui Wang, and Hsi-Yung Feng. "Adaptive Setup Planning of Prismatic Parts by Tool Accessibility Examination." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81055.
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Setup planning for machining a part is to determine the number and sequence of setups (including machining features grouping in setups) and the part orientation of each setup. Tool accessibility plays a key role in this process. An adaptive setup planning approach for different types of multi-axis machine tools is proposed in this paper by investigating Tool Access Directions (TADs) of machining features, Tool Orientation Spaces (TOSs) of machine tools, and Primary Locating Directions (PLDs) of workpieces. In our approach, feasible TADs of a machining feature are predefined based on feature geometry and best practice knowledge, and denoted by unit vectors; The TOS of a machine tool is generated according to its configuration through kinematic analysis, and represented by a unit spherical surface patch; Primary locating directions and their priorities of a workpiece are determined based on the surface areas and the surface accuracy grades of non-machining surfaces. Starting from a 3-axis based machining feature grouping, setups for a 3-, 4- (or 3-axis with indexing table), or 5-axis machine can be achieved effectively by tool accessibility examination. A so-generated setup plan can provide not only the best coverage of machining features but the optimal orientation for each setup. Prismatic parts are considered in the proof-of-concept phase. Algorithms introduced here are implemented in MATLAB, and a case study is used to show the results.
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Balajiranganathan, Anupreethi, Anurag Gupta, Umasankari Kannan, and Akhilanand Pati Tiwari. "Optimization of In-Core Detector Locations in AHWR Using Bond Energy Algorithm." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16480.
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Abstract A solution to optimization of in-core detectors placement for Advanced Heavy Water Reactor (AHWR) has been attempted. AHWR houses in-core detector units with Self-Powered Neutron Detectors (SPND) distributed axially and their measurement serves as an input to Online Flux Mapping System (OFMS) to monitor the three-dimensional neutron flux distribution. There is a requirement of placing these in-core detectors at optimum locations to retrieve maximum information about the reactor while keeping their number to the minimum. This paper attempts to optimize SPND placement through the application of Bond Energy Algorithm (BEA), a clustering technique which groups the SPNDs based on correlation. This works on the concept of grouping strongly correlated SPNDs into blocks and choosing one SPND from each block as the optimal location. The higher the uncorrelation among optimal SPNDs, the higher the independent information retrieved about the actual configuration of the reactor. It can be inferred from this work that the number and location of SPNDs are highly dependent on the initial set of SPND locations and the correlation threshold. It can be seen that as the correlation threshold increases, the number of optimal locations increases. The obtained optimal locations have been validated for various operational reactor configurations using different Flux Mapping Algorithms (FMA).
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Vega, Almudena, Roque Corral, Achim Zanker, and Peter Ott. "Experimental and Numerical Assessment of the Aeroelastic Stability of Blade Pair Packages." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25607.
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The stabilizing effect of grouping rotor blades in pairs has been assessed both, numerically and experimentally. The bending and torsion modes of a low aspect ratio high speed turbine cascade tested in the non-rotating test facility at EPFL (Ecole Polytechnique Fédérale de Lausanne) have been chosen as the case study. The controlled vibration of 20 blades in travelling wave form was performed by means of an electromagnetic excitation system, enabling the adjustement of the vibration amplitude and inter blade phase at a given frequency. Unsteady pressure transducers located along the blade mid-section were used to obtain the modulus and phase of the unsteady pressure caused by the airfoil motion. The stabilizing effect of the torsion mode was clearly observed both in the experiments and the simulations, however the effect of grouping the blades in pairs in the minimum damping at the tested frequency was marginal in the bending mode. A numerical tool was validated using the available experimental data and then used to extend the results at lower and more relevant reduced frequencies. It is shown that the stabilizing effect exists for the bending and torsion modes in the frequency range typical of low-pressure turbines. It is concluded that the stabilizing effect of this configuration is due to the shielding effect of the pressure side of the airfoil that defines the passage of the pair on the suction side of the same passage, since the relative motion between both is null. This effect is observed both in the experiments and simulations.
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Adeoye, A. O. M., and T. Sze´csi. "The Use of Hybrid System of Classification for the Retrieval and Modification of Mechanical Products." In ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50157.
Full textAbstract:
With people becoming more individualistic in their choices they make in personalizing the goods and services they use, as resulted in major development that has been recorded in the customisation world. This individualism has resulted in the increase in demand of customized products in many industries especially in the footwear, kitchen and computer industries. However, little has been done when it comes to mechanically oriented products and little flexibility has been given to the consumers in the co-creation of customized products. The Hybrid system of classification is one way to satisfy the customers’ need for the products that are mechanically oriented in nature thereby meeting their desire needs. This paper presents a framework in which an Hybrid system of classification is used to integrates Customers into the design process by defining, configuring, matching, or modifying personal product that is mechanically oriented in nature and grouping the products into classes and sub-classes using a wide range of product parameters, products configuration which make it possible to add and/or change functionalities of a core product, a coding system for mechanical designs which is applicable to each product in the hierarchy, the use of a database for the products information. And the retrieval system to retrieve a similar product code from the database if the initial customer configuration data does not yield a feasible product code through the application of Analytic Hierarchy Process and finally modifying the existing similar product to suit the customers desire.
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Ayton, Brent, Thomas Dessein, Alex Fraser, Mari Shironishi, Travis Sera, and Daniel Shapiro. "Probabilistic Corrosion Assessment for Natural Gas Storage Wells." In 2022 14th International Pipeline Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/ipc2022-86794.
Full textAbstract:
Abstract Regulations for gas storage wells require that operators perform initial and subsequent mechanical integrity evaluations as determined using risk assessment [1], incorporated by reference in 49 CFR 192.12 for U.S. operators [2]. As a well ages, metal loss on the casing can grow, increasing the probability of a failure from corrosion. Inspection and repair programs manage this probability by reducing uncertainty in the casing condition and repairing significant metal loss anomalies. However, performing a casing inspection involves a considerable amount of risk, which can vary depending on the well configuration [3]. The benefit of inspection and repair needs to be balanced with the inspection risk to determine the interval that minimizes the overall risk. This paper demonstrates that if detailed information about a well’s configuration, loading, and existing corrosion population is considered, a probabilistic corrosion analysis can be completed to determine a reinspection date that minimizes the overall risk of a release. A probabilistic implementation of the Level II analysis found in API 579 Fitness-For-Service is described and recommended for these assessments [4]. The deterministic version of this model is the most accurate for predicting burst pressures of casings with metal loss under a wide range of loading conditions [5]. The measurement error of inspection tools and their reporting thresholds relative to typical corrosion rates presents many challenges in calculating corrosion rates deterministically. Calculating unrealistically high growth rates and apparent negative growth rates using inspection data is common. Using the tool measurement error and the distribution of calculated growth rates across several wells, a Bayesian updating approach is described, grouping anomalies in similar environments to develop credible growth rate distributions specific to each joint on a well. This paper provides several assessments of realistic storage well configurations and corrosion populations to demonstrate how the probabilistic corrosion assessment can determine an inspection interval that minimizes the overall risk and ultimately inform integrity maintenance plans on a well-by-well basis. The examples span a wide range of well conditions to illustrate that the optimal inspection and repair program depends on each well’s configuration, loading, and existing corrosion population. The effect of a corrosion anomaly’s depth in the well and the cement quality on the expected release rate and the resulting risk is also examined.
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Bohlin, Markus, and Mathias Wa¨rja. "Optimizing Maintenance for Multi-Unit Industrial Gas Turbine Installations." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23398.
Full textAbstract:
High levels of availability and reliability are essential in many industries where production is subject to high costs due to downtime. Examples where gas turbines are used include the mechanical drive in natural gas pipelines and power generation on oil platforms, where it is common to use redundant gas turbines to mitigate the effects of service outage. In this paper, component-level maintenance of parallel multi-unit systems is considered, allowing production at a reduced level when some of the units are not operational. Units are themselves assumed to be composed out of components in a serial configuration; maintenance of one component implies shutdown of the unit. Parallel installations allow maintenance to be performed on one or a few gas turbines without taking down the entire installation. This allows maintenance to be optimized even further than in a serial system. However, the maintenance optimization process is made more complicated, since there now exist both positive and negative grouping effects. The positive grouping effects come from shared setup activities and costs, and the negative effects come from resource limitations, in this case the limited number of gas turbines which can be maintained at the same time. In the approach presented in this paper, each component has its individual preventive maintenance schedule, which is updated at inspections, changes in production and when indicated using remote condition monitoring. A minimal repair model for noncritical routine inspections and service tasks is assumed, which does not affect component state. In addition, previously developed procedures for estimating and measuring residual component lifetime for individual components during operation are used. The procedures are based on a Retirement For Cause (RFC) approach where components are not replaced until a potential failure has been detected. To maximize revenues for an operator, the available information is evaluated using software where scenario analysis and optimization is performed. To show the possible economic effects, gas turbine operation data is used together with maintenance and operator requirements as input for optimization of a production line consisting of a natural-gas compressor station having three SGT-600 gas turbines. Savings can be substantial compared to a traditional preventive maintenance plan.
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Short, Michael, and Steven H. Meller. "Elements of Comprehensive Pipeline Optimization." In 1996 1st International Pipeline Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/ipc1996-1934.
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It is well known that algorithms exist for reducing pipeline operating costs. These algorithms are exact for ideal pipelines and need to be modified to provide solutions for the real world. The issues include pipeline configurations, utility cost structures, and quantification of hydraulic safety. Successful modification requires understanding of the pipeline operating environment (on-line operations) and must be linked to pipeline operating conditions. Many of the optimization tools available to the pipeline industry today are based upon a dynamic programming algorithm attributed to Bellman. The costs of unit operations are balanced with the energy absorbed in heat due to frictional and other losses. This is carried out in such a way as to reduce the massive computational effort of an exhaustive solution search to a manageable level. For a pedagogical treatment of the problem, this is adequate. However, there are many significant factors which need to be added into and around this basic calculation. First, an algorithm with electrical cost factors only cannot evaluate penalties associated with poor hydraulics choices. Demand grouping, parallel pipelines, large amplitude pressure cycles, look ahead, and unit cycling also can and should be included in a full analysis. A modification to Bellman’s algorithm for non-linear pipeline configurations and electrical contracts will be developed and discussed in the context of a real-world petroleum pipeline operation.
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Moroto, Robert H., Robert R. Bitmead, and Amit Pandey. "Linear Grey-Box Modeling of Gas Turbine Engines for MIMO Control Design." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75847.
Full textAbstract:
High-fidelity models are an increasingly indispensable tool for evaluating high-performance control and optimization algorithms of gas turbine (GT) engines. However, GT high-fidelity models (HFM’s) are often too complex for synthesizing model-based control and optimization algorithms, which are much more amenable to low-order linear dynamic models. Obtaining models suitable for control synthesis can be arduous and costly. White-box (first-principles) methods may produce models that lose fidelity in off-nominal conditions, while black-box (data-driven) methods yield model parameters without physical significance, preventing generalization of the model across product configurations. This paper presents a grey-box method for obtaining low-order linear dynamic models for a 5.5 MW GT engine that retain fidelity at off-nominal conditions and generalize to multiple product configurations. The approach exploits the structure of an available HFM by grouping its constituent component-level models according to their suitability to white-box or black-box modeling. Specifically, the rotor model is linearized, yielding a first-order linear model with adjustable physical parameters, e.g. inertia. A second-order open-loop linear model is obtained from remaining component-level models via system identification using closed-loop data generated by the HFM. The linear models are combined to form a third-order open-loop linear GT engine model, which retains fidelity with the HFM in transient validation experiments, and multiple rotor inertia values.
Reports on the topic "Grouping Configuration"
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Khrushch, Nila, Pavlo Hryhoruk, Tetiana Hovorushchenko, Sergii Lysenko, Liudmyla Prystupa, and Liudmyla Vahanova. Assessment of bank's financial security levels based on a comprehensive index using information technology. [б. в.], October 2020. http://dx.doi.org/10.31812/123456789/4474.
Full textAbstract:
The article considers the issues of assessing the level of financial security of the bank. An analysis of existing approaches to solving this problem. A scientific and methodological approach based on the application of comprehensive assessment technology is proposed. The computational algorithm is presented in the form of a four-stage procedure, which contains the identification of the initial data set, their normalization, calculation of the partial composite indexes, and a comprehensive index of financial security. Results have interpretation. Determining the levels of financial security and the limits of the relevant integrated indicator is based on the analysis of the configuration of objects in the two-scale space of partial composite indexes, which is based on the division of the set of initial indicators by content characteristics. The results of the grouping generally coincided with the results of the banks ranking according to the rating assessment of their stability, presented in official statistics. The article presents the practical implementation of the proposed computational procedure. To automate calculations and the possibility of scenario modeling, an electronic form of a spreadsheet was created with the help of form controls. The obtained results allowed us to identify the number of levels of financial security and their boundaries.