Relevant bibliographies by topics / Constraint handler

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Constraint handler'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Journal articles on the topic "Constraint handler"

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Layeghy, Siamak, Farzaneh Pakzad, and Marius Portmann. "A New QoS Routing Northbound Interface for SDN." Australian Journal of Telecommunications and the Digital Economy 5, no. 1 (March 31, 2017): 92. http://dx.doi.org/10.18080/ajtde.v5n1.91.

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In this paper, we introduce SCOR (Software-defined Constrained Optimal Routing), a new Software Defined Networking (SDN) Northbound Interface for QoS routing and traffic engineering. SCOR is based on constraint-programming techniques and is implemented in the MiniZinc modelling language. It provides a powerful, high-level abstraction layer, consisting of 10 basic constraint-programming predicates. A key feature of SCOR is that it is declarative, where only the constraints and utility function of the routing problem need to be expressed, and the complexity of solving the problem is hidden from the user, and handled by a powerful generic solver. We show that the interface (set of predicates) of SCOR is sufficiently expressive to handle all the known and relevant QoS routing problems. We further demonstrate the practicality and scalability of the approach via a number of example scenarios, with varying network topologies, network sizes and number of flows.
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Layeghy, Siamak, Farzaneh Pakzad, and Marius Portmann. "A New QoS Routing Northbound Interface for SDN." Journal of Telecommunications and the Digital Economy 5, no. 1 (March 31, 2017): 92–115. http://dx.doi.org/10.18080/jtde.v5n1.91.

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In this paper, we introduce SCOR (Software-defined Constrained Optimal Routing), a new Software Defined Networking (SDN) Northbound Interface for QoS routing and traffic engineering. SCOR is based on constraint-programming techniques and is implemented in the MiniZinc modelling language. It provides a powerful, high-level abstraction layer, consisting of 10 basic constraint-programming predicates. A key feature of SCOR is that it is declarative, where only the constraints and utility function of the routing problem need to be expressed, and the complexity of solving the problem is hidden from the user, and handled by a powerful generic solver. We show that the interface (set of predicates) of SCOR is sufficiently expressive to handle all the known and relevant QoS routing problems. We further demonstrate the practicality and scalability of the approach via a number of example scenarios, with varying network topologies, network sizes and number of flows.
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Wei, Junbao, Haiyan Li, Ming Guo, Jing Li, and Huang Huang. "Backstepping Control Based on Constrained Command Filter for Hypersonic Flight Vehicles with AOA and Actuator Constraints." International Journal of Aerospace Engineering 2021 (September 2, 2021): 1–16. http://dx.doi.org/10.1155/2021/8620873.

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An antisaturation backstepping control scheme based on constrained command filter for hypersonic flight vehicle (HFV) is proposed with the consideration of angle of attack (AOA) constraint and actuator constraints of amplitude and rate. Firstly, the HFV system model is divided into velocity subsystem and height subsystem. Secondly, to handle AOA constraint, a constrained command filter is constructed to limit the amplitude of the AOA command and retain its differentiability. And the constraint range is set in advance via a prescribed performance method to guarantee that the tracking error of the AOA meets the constraint conditions and transient and steady performance. Thirdly, the proposed constrained command filter is combined with the auxiliary system for actuator constraints, which ensures that the control input meets the limited requirements of amplitude and rate, and the system is stable. In addition, the tracking errors of the system are proved to be ultimately uniformly bounded based on the Lyapunov stability theory. Finally, the effectiveness of the proposed method is verified by simulation.
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Sekizawa, Maisa, and Nobuyuki Kutsukake. "Maternal protectiveness is negatively associated with infant handling in wild Japanese macaques." Behaviour 156, no. 2 (2019): 155–79. http://dx.doi.org/10.1163/1568539x-00003534.

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Abstract Infant handling by a non-mother is common in many primate species. Despite the requirement of a triadic relationship among handler, mother, and infant, previous studies of infant handling have focused on characteristics of handler or interactions between mother and handler. In this study, we examined the influence of the mother–infant relationship (i.e., maternal style) on the frequency with which wild Japanese macaque (Macaca fuscata) infants were handled. We analysed behavioural data collected during 3 consecutive years and found that maternal style was characterised by three principal components: infant activity, rejection, and non-protectiveness. Infants who were less active and whose mothers were less protective received more frequent handling. These effects were particularly evident when handlers were thought to have less access to the infant. These complex interactions within the triadic relationship suggest that maternal style constrains the occurrence of infant handling in group-living primates.
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Hauser, Kris. "Semi-infinite programming for trajectory optimization with non-convex obstacles." International Journal of Robotics Research 40, no. 10-11 (January 10, 2021): 1106–22. http://dx.doi.org/10.1177/0278364920983353.

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This article presents a novel optimization method that handles collision constraints with complex, non-convex 3D geometries. The optimization problem is cast as a semi-infinite program in which each collision constraint is implicitly treated as an infinite number of numeric constraints. The approach progressively generates some of these constraints for inclusion in a finite nonlinear program. Constraint generation uses an oracle to detect points of deepest penetration, and this oracle is implemented efficiently via signed distance field (SDF) versus point cloud collision detection. This approach is applied to pose optimization and trajectory optimization for both free-flying rigid bodies and articulated robots. Experiments demonstrate performance improvements compared with optimizers that handle only convex polyhedra, and demonstrate efficient collision avoidance between non-convex CAD models and point clouds in a variety of pose and trajectory optimization settings.
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Rutter, Nicholas J., Tiffani J. Howell, Arthur A. Stukas, Jack H. Pascoe, and Pauleen C. Bennett. "Diving in Nose First: The Influence of Unfamiliar Search Scale and Environmental Context on the Search Performance of Volunteer Conservation Detection Dog–Handler Teams." Animals 11, no. 4 (April 20, 2021): 1177. http://dx.doi.org/10.3390/ani11041177.

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Conservation detection dogs (CDDs) are trained to locate biological material from plants and animals of interest to conservation efforts and are often more effective and economical than other detection methods. However, the financial costs of developing and appropriately caring for CDDs can nonetheless prohibit their use, particularly by smaller conservation organizations. Training skilled volunteers to work with suitable pet dogs may help address this constraint. We sought to further develop the skills of 13 volunteer dog–handler teams that were trained in a previous study to detect myrrh essential oil in controlled laboratory conditions. We assessed search sensitivity, search effort, search precision and false-alert instances through progressive training stages increasing in size and environmental complexity. First, teams searched various-sized areas before and after 12 weeks of search training on a sports-field. Next, teams searched various-sized areas before and after seven weeks of training in bushland. Overall, search sensitivity decreased by approximately 20% in each unfamiliar context, compared to performance in familiar contexts. However, sensitivity typically improved from baseline performance by 10–20% after a period of training. Six teams found at least 78% of targets after training in bushland, yet sensitivity ranged from 29% to 86% between teams. We maintain that the foundational skills developed previously were necessary to prepare volunteer teams for field surveys involving conservation related targets. However, our results highlight the need to also train volunteer CDD teams in search scale and environmental contexts similar to their intended working conditions.
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Gorti, Sreenivasa Rao, Salal Humair, Ram D. Sriram, Sarosh Talukdar, and Sesh Murthy. "Solving constraint satisfaction problems using ATeams." Artificial Intelligence for Engineering Design, Analysis and Manufacturing 10, no. 1 (January 1996): 1–19. http://dx.doi.org/10.1017/s0890060400001256.

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AbstractThis paper presents an approach to solving constraint satisfaction problems using Asynchronous Teams of autonomous agents (ATeams). The focus for the constraint satisfaction problem is derived from an effort to support spatial layout generation in a conceptual design framework. The constraint specification allows a high-level representation and manipulation of qualitative geometric information. We present a computational technique based on ATeams to instantiate solutions to the constraint satisfaction problem. The technique uses a search for a solution in numerical space. This permits us to handle both qualitative relationships and numerical constraints in a unified framework. We show that simple knowledge, about human spatial reasoning and about the nature of arithmetic operators can be hierarchically encapsulated and exploited efficiently in the search. An example illustrates the generality of the approach for conceptual design. We also present empirical studies that contrast the efficiency of ATeams with a search based on genetic algorithms. Based on these preliminary results, we argue that the ATeams approach elegantly handles arbitrary sets of constraints, is computationally efficient, and hence merits further investigation.
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Yang, B. "Eigenvalue Inclusion Principles for Distributed Gyroscopic Systems." Journal of Applied Mechanics 59, no. 3 (September 1, 1992): 650–56. http://dx.doi.org/10.1115/1.2893773.

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In his famous treatise The Theory of Sound, Rayleigh enunciated an eigenvalue inclusion principle for the discrete, self-adjoint vibrating system under a constraint. According to this principle, the natural frequencies of the discrete system without and with the constraint are alternately located along the positive real axis. Although it is commonly believed that the same rule also applied for distributed vibrating systems, no proof has been given for the distributed gyroscopic system. This paper presents several eigenvalue inclusion principles for a class of distributed gyroscopic systems under pointwise constraints. A transfer function formulation is proposed to describe the constrained system. Five types of nondissipative constraints and their effects on the system natural frequencies are studied. It is shown that the transfer function formulation is a systematic and convenient way to handle constraint problems for the distributed gyroscopic system.
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Zhao, Tian Yang, Guo Bing Qiu, Ying Zhi Li, Wen Xia Liu, and Jian Hua Zhang. "Constrained Multi-Objective Differential Evolution for Security Constrained Economic/Environmental Dispatch." Applied Mechanics and Materials 291-294 (February 2013): 817–22. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.817.

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A newly constrained multi-objective differential evolution optimization technique (CMODE) for security constrained economic/environmental dispatch (EED) was proposed. The proposed CMODE evolved a constrained multi-objective version of differential evolution (DE) by employing the traditional multi-objective differential evolution (DEMO) and constrain handle technique to balance the search between feasible region and infeasible region. The proposed CMODE method had been applied to solve the security constrained EED problem. Experiments had been carried on a standard test system. The results demonstrate the high efficiency of the proposed method to solve security constrained EED problem, and the necessary of taking security constrains into consideration.
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Nordin, Axel, Damien Motte, Andreas Hopf, Robert Bjärnemo, and Claus-Christian Eckhardt. "Constraint-handling techniques for generative product design systems in the mass customization context." Artificial Intelligence for Engineering Design, Analysis and Manufacturing 27, no. 4 (October 18, 2013): 387–99. http://dx.doi.org/10.1017/s0890060413000383.

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AbstractGenerative product design systems used in the context of mass customization are required to generate diverse solutions quickly and reliably without necessitating modification or tuning during use. When such systems are employed to allow for the mass customization of product form, they must be able to handle mass production and engineering constraints that can be time-consuming to evaluate and difficult to fulfill. These issues are related to how the constraints are handled in the generative design system. This article evaluates two promising sequential constraint-handling techniques and the often used weighted sum technique with regard to convergence time, convergence rate, and diversity of the design solutions. The application used for this purpose was a design system aimed at generating a table with an advanced form: a Voronoi diagram based structure. The design problem was constrained in terms of production as well as stability, requiring a time-consuming finite element evaluation. Regarding convergence time and rate, one of the sequential constraint-handling techniques performed significantly better than the weighted sum technique. Nevertheless, the weighted sum technique presented respectable results and therefore remains a relevant technique. Regarding diversity, none of the techniques could generate diverse solutions in a single search run. In contrast, the solutions from different searches were always diverse. Solution diversity is thus gained at the cost of more runs, but no evaluation of the diversity of the solutions is needed. This result is important, because a diversity evaluation function would otherwise have to be developed for every new type of design. Efficient handling of complex constraints is an important step toward mass customization of nontrivial product forms.
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Dissertations / Theses on the topic "Constraint handler"

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Fabbri, Luca. "Computing primal solutions with exact arithmetics in SCIP." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8541/.

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The research for exact solutions of mixed integer problems is an active topic in the scientific community. State-of-the-art MIP solvers exploit a floating- point numerical representation, therefore introducing small approximations. Although such MIP solvers yield reliable results for the majority of problems, there are cases in which a higher accuracy is required. Indeed, it is known that for some applications floating-point solvers provide falsely feasible solutions, i.e. solutions marked as feasible because of approximations that would not pass a check with exact arithmetic and cannot be practically implemented. The framework of the current dissertation is SCIP, a mixed integer programs solver mainly developed at Zuse Institute Berlin. In the same site we considered a new approach for exactly solving MIPs. Specifically, we developed a constraint handler to plug into SCIP, with the aim to analyze the accuracy of provided floating-point solutions and compute exact primal solutions starting from floating-point ones. We conducted a few computational experiments to test the exact primal constraint handler through the adoption of two main settings. Analysis mode allowed to collect statistics about current SCIP solutions' reliability. Our results confirm that floating-point solutions are accurate enough with respect to many instances. However, our analysis highlighted the presence of numerical errors of variable entity. By using the enforce mode, our constraint handler is able to suggest exact solutions starting from the integer part of a floating-point solution. With the latter setting, results show a general improvement of the quality of provided final solutions, without a significant loss of performances.
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Matthews, Jason Anthony. "A constraint-based approach for assessing the capabilities of existing designs to handle product variation." Thesis, University of Bath, 2007. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486841.

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All production machinery is designed with an inherent capability to handle slight variations in product. This is initially achieved by simply providing adjustments to allow, for example, changes that occur in pack sizes to be accommodated, through user settings or complete sets of change parts. By the appropriate use of these abilities most variations in product can be handled. However when extreme conditions of setups, major changes in product size and configuration, are considered there is no guarantee that the existing machines are able to cope. The problem is even more difficult to deal with when completely new product families are proposed to be made on an existing product line. Such changes in product range are becoming more common as producers respond to demands for ever increasing customization and product differentiation. An issue exists due to the lack of knowledge on the capabilities of the machines being employed. This often forces the producer to undertake a series of practical product trials. These however can only be undertaken once the product form has been decided and produced in sufficient numbers. There is then little opportunity to make changes that could greatly improve the potential output of the line and reduce waste. There is thus a need for a supportive modelling approach that allows the effect of variation in products to be analyzed together with an understanding of the manufacturing machine capability. Only through their analysis and interaction can the capabilities be fully understood and refined to make production possible. This thesis presents a constraint-based approach that offers a solution to the problems above. While employing this approach it has been shown that, a generic process can be formed to identify the limiting factors (constraints) of variant products to be processed. These identified constraints can be mapped to form the potential limits of performance for the machine. The limits of performance of a system (performance envelopes) can be employed to assess the design capability to cope with product variation. The approach is successfully demonstrated on three industrial case studies.
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Innocente, Mauro Sebastian. "Development and testing of a particle swarm optimizer to handle hard unconstrained and constrained problems." Thesis, Swansea University, 2010. https://cronfa.swan.ac.uk/Record/cronfa43043.

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Liu, Yanrui. "Synthesizing motion sequences from sample motions to satisfy environmental constraints." Scholarly Commons, 2014. https://scholarlycommons.pacific.edu/uop_etds/228.

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Complex realistic human motion sequences satisfying environmental constraints can be created by motion capture, which is a reliable way to reproduce human motions. However, motion capture data is difficult to modify in order to obtain variant motion sequences for multiple tasks. In this thesis, a system for synthesizing complex realistic human motion sequences based on a small group of sample motions to satisfy constraints is proposed. Methods are proposed for the system to preprocesses raw motion capture data to create sample motions that can be easily modified for the purpose of meeting specific requirements, while maintaining the subtleties of the origin motion capture data. Methods for the system to scan user-input constraints, to choose the best sample motion and synthesize the motion sequence based on route affected by the constraint are also proposed. Each generated motion piece is blended with the default motion, and thus a motion sequence composed of several pieces of motion based on constraints will be generated. Artifacts that arise during motion generation are identified and handled properly. Experimental results will show that the system can create cyclical sample motions from motion capture data, generate motion pieces based on environmental constraints, and synthesize complex realistic human motion sequences.
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Hofmann, Stephan [Verfasser]. "What Constrains Southern African Countries from Further Improving Their Supply Chain Performance / Stephan Hofmann." Flensburg : Zentrale Hochschulbibliothek Flensburg, 2018. http://d-nb.info/1198505486/34.

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Avezum, Mariana [Verfasser], Bernd [Akademischer Betreuer] Brügge, Vivian [Gutachter] Loftness, and Bernd [Gutachter] Brügge. "SCOUP: A Framework for Sustainable Constraint-based Urban Planning / Mariana Avezum ; Gutachter: Vivian Loftness, Bernd Brügge ; Betreuer: Bernd Brügge." München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1220322466/34.

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Wang, Pengming. "Descriptive complexity of constraint problems." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/276188.

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Constraint problems are a powerful framework in which many common combinatorial problems can be expressed. Examples include graph colouring problems, Boolean satisfaction, graph cut problems, systems of equations, and many more. One typically distinguishes between constraint satisfaction problems (CSPs), which model strictly decision problems, and so-called valued constraint satisfaction problems (VCSPs), which also include optimisation problems. A key open problem in this field is the long-standing dichotomy conjecture by Feder and Vardi. It claims that CSPs only fall into two categories: Those that are NP-complete, and those that are solvable in polynomial time. This stands in contrast to Ladner's theorem, which, assuming P$\neq$NP, guarantees the existence of problems that are neither NP-complete, nor in P, making CSPs an exceptional class of problems. While the Feder-Vardi conjecture is proven to be true in a number of special cases, it is still open in the general setting. (Recent claims affirming the conjecture are not considered here, as they have not been peer-reviewed yet.) In this thesis, we approach the complexity of constraint problems from a descriptive complexity perspective. Namely, instead of studying the computational resources necessary to solve certain constraint problems, we consider the expressive power necessary to define these problems in a logic. We obtain several results in this direction. For instance, we show that Schaefer's dichotomy result for the case of CSPs over the Boolean domain can be framed as a definability result: Either a CSP is definable in fixed-point logic with rank (FPR), or it is NP-hard. Furthermore, we show that a dichotomy exists also in the general case. For VCSPs over arbitrary domains, we show that a VCSP is either definable in fixed-point logic with counting (FPC), or it is not definable in infinitary logic with counting. We show that these definability dichotomies also have algorithmic implications. In particular, using our results on the definability of VCSPs, we prove a dichotomy on the number of levels in the Lasserre hierarchy necessary to obtain an exact solution: For a finite-valued VCSP, either it is solved by the first level of the hierarchy, or one needs $\Omega(n)$ levels. Finally, we explore how other methods from finite model theory can be useful in the context of constraint problems. We consider pebble games for finite variable logics in this context, and expose new connections between CSPs, pebble games, and homomorphism preservation results.
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Figlar, Bastian B. [Verfasser]. "The potential of noise abatement procedures to sustain traffic growth within airport noise constraints / Bastian Figlar." München : Verlag Dr. Hut, 2013. http://d-nb.info/1045987794/34.

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Kutzer, Katja [Verfasser], Alexander [Akademischer Betreuer] Martin, and Alexander [Gutachter] Martin. "Using Piecewise Linear Approximation Techniques to Handle Bilinear Constraints with Application to Off-Grid Hybrid Energy Systems / Katja Kutzer ; Gutachter: Alexander Martin ; Betreuer: Alexander Martin." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2021. http://d-nb.info/1228627584/34.

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Sheikh, Hussin Siti Aida. "Employees Provident Fund (EPF) Malaysia : generic models for asset and liability management under uncertainty." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/7505.

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We describe Employees Provident Funds (EPF) Malaysia. We explain about Defined Contribution and Defined Benefit Pension Funds and examine their similarities and differences. We also briefly discuss and compare EPF schemes in four Commonwealth countries. A family of Stochastic Programming Models is developed for the Employees Provident Fund Malaysia. This is a family of ex-ante decision models whose main aim is to manage, that is, balance assets and liabilities. The decision models comprise Expected Value Linear Programming, Two Stage Stochastic Programming with recourse, Chance Constrained Programming and Integrated Chance Constraints Programming. For the last three decision models we use scenario generators which capture the uncertainties of asset returns, salary contributions and lump sum liabilities payments. These scenario generation models for Assets and liabilities were developed and calibrated using historical data. The resulting decisions are evaluated with in-sample analysis using typical risk adjusted performance measures. Out- of- sample testing is also carried out with a larger set of generated scenarios. The benefits of two stage stochastic programming over deterministic approaches on asset allocation as well as the amount of borrowing needed for each pre-specified growth dividend are demonstrated. The contributions of this thesis are i) an insightful overview of EPF ii) construction of scenarios for assets returns and liabilities with different values of growth dividend, that combine the Markov population model with the salary growth model and retirement payments iii) construction and analysis of generic ex-ante decision models taking into consideration uncertain asset returns and uncertain liabilities iv) testing and performance evaluation of these decisions in an ex-post setting.
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Books on the topic "Constraint handler"

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Grafstein, Robert. Institutional realism: Social and political constraints on rationalactors. New Haven: Yale University Press, 1992.

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Grafstein, Robert. Institutional realism: Social and political constraints on rational actors. New Haven: Yale University Press, 1992.

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Brönmark, Christer, and Lars-Anders Hansson. The Abiotic Frame and Adaptations to Cope with Abiotic Constraints. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198713593.003.0002.

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This chapter draws up the abiotic frame for organisms set by the physical and chemical properties of a specific ecosystem. The abiotic frame is a combination of several features, including wind, turbulence, temperature and light, but also by nutrient status, pH and oxygen supply. Based on this abiotic frame, large-scale movements, as well as stratification phenomena of lakes are discussed. The importance of the surrounding land, that is, the catchment area, is stressed; specifically, how the catchment area may strongly affect the physical and chemical features of the lake or pond. In addition, this chapter explains how lakes and ponds have been, and still are, formed in the landscape and how organisms handle the abiotic frame.
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Wagner, Christian. Western Europe. Edited by David M. Malone, C. Raja Mohan, and Srinath Raghavan. Oxford University Press, 2010. http://dx.doi.org/10.1093/oxfordhb/9780198743538.013.36.

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India has long-standing relations with Western Europe. The Strategic Partnership Agreement of 2004 with the European Union and similar agreements with individual European states form the institutional basis for economic, political, military, technological, and cultural cooperation with India. But despite common interests in many areas, the strategic perspectives remain limited because of structural constraints in India and Western Europe. Even after the Treaty of Lisbon, the foreign policy of the EU will be shared between Brussels and the member states. India’s foreign policy is handled mostly by the under-staffed Ministry of External Affairs. This is far from being adequate to cope with the requirements of an interdependent global system and India’s own aspirations to play a more important role. Hence, only if both sides understand the structural constraints and limitations of the other, will the partnership flourish on a more realistic basis.
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Levi, Ron, John Hagan, and Sara Dezalay. International Criminal Tribunals. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198795582.003.0015.

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This chapter focuses on international criminal tribunals. These have emerged as part of a professional field of international criminal law, reshaping how atrocities are handled at the international level. They include the International Criminal Tribunal for Rwanda, the International Criminal Tribunal for the Former Yugoslavia (ICTY), and the International Criminal Court (ICC). In many international courts, authority turns on judicial decisions. Yet in the context of international criminal courts, prosecutorial strategy is often at the core of the building or waning of authority. This is partly because of the power of prosecutors to make headlines and cause political controversy with indictments, and of the highly contentious and atypical political environments in which these courts operate. In building their authority, prosecutors are acutely aware of the constraints on the authority they enjoy and thus seek to speak to the constituencies they need—while avoiding others—through their prosecutorial practices.
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Deahl, Lora, and Brenda Wristen. Adaptive Strategies for Small-Handed Pianists. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190616847.001.0001.

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Adaptive Strategies for Small-Handed Pianists brings together information from ergonomics, physics, biomechanics, anatomy, medicine, and piano pedagogy to focus on the subject of small-handedness. Chapter 1 presents an overview from historical, anatomical, and pedagogical perspectives and includes a discussion of small-handedness as a risk factor for piano-related injury. Chapter 2 establishes a basic understanding of work efficiency and the human anatomy, moves on to general observations about piano playing and the constraints of physics, and explains the principles of healthy movement at the piano. Chapter 3 is a focused analysis of piano technique as it relates to small-handedness. Chapters 4 to 7 deal with specific alternative approaches: redistribution, refingering, ways to maximize reach and power, and musical solutions for technical problems. Hundreds of examples taken from the standard intermediate and advanced piano literature show concrete applications of these strategies within appropriate musical contexts. Chapter 8 presents tables that pianists can use to diagnose and resolve commonly encountered problems and synthesizes the adaptive approaches outlined in the book. Reflective application points are provided as guides to further exploration. The book demonstrates that the specific physical and musical needs of the small-handed can be addressed in sensitive and appropriate ways and illuminates alternative paths to help pianists with small hands reach their musical goals.
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Pearson, Trais. Sovereign Necropolis. Cornell University Press, 2020. http://dx.doi.org/10.7591/cornell/9781501740152.001.0001.

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By the 1890s, Siam (Thailand) was the last holdout against European imperialism in Southeast Asia. But the kingdom's exceptional status came with a substantial caveat: Bangkok, its bustling capital, was a port city that was subject to many of the same legal and fiscal constraints as other colonial treaty ports. This book offers new insight into turn-of-the-century Thai history by disinterring the forgotten stories of those who died “unnatural deaths” during this period and the work of the Siamese state to assert their rights in a pluralistic legal arena. The book documents the piecemeal introduction of new forms of legal and medical concern for the dead. It reveals that the investigation of unnatural death demanded testimony from diverse strata of society: from the unlettered masses to the king himself. These cases raised questions about how to handle the dead—were they spirits to be placated or legal subjects whose deaths demanded compensation?—as well as questions about jurisdiction, rights, and liability. Exhuming the history of imperial politics, transnational commerce, technology, and expertise, the book demonstrates how the state's response to global flows transformed the nature of legal subjectivity and politics in lasting ways. A compelling exploration of the troubling lives of the dead in a cosmopolitan treaty port, the book is a notable contribution to the growing corpus of studies in science, law, and society in the non-Western world.
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Herrold, Catherine E. Delta Democracy. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190093235.001.0001.

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For decades, the United States has funded democracy promotion programs in the Middle East to little avail. Delta Democracy: Pathways to Incremental Civic Revolution in Egypt and Beyond argues that there is another way forward for US democracy aid. Drawing upon the author’s ethnographic research on Egypt’s nongovernmental organizations (NGOs) in the wake of the 2011 Arab Spring uprisings, Delta Democracy uncovers the strategies that local NGOs used to incrementally build a more democratic and just society. As it takes the reader inside the walls of Egypt’s NGOs, the book illuminates local activists’ perspectives on democracy in Egypt and reveals how savvy organizations promoted it as they navigated rapidly evolving opportunities and constraints in the years following the uprisings. Departing from US democracy brokers’ heavy-handed attempts to reform national political institutions, local organizations worked with grassroots communities to build a culture of democracy through public discussion and debate, free expression, and rights claiming. By weaving this democracy building work into public-facing economic development projects, Egypt’s NGOs managed to persevere through years of government crackdowns on civil society. Taking lessons learned from the Egyptian case, Delta Democracy advances our scholarly understanding of how civil society organizations maneuver state repression to combat political authoritarianism. It also offers a concrete set of recommendations on how US policymakers can restructure foreign aid to better connect with global contemporary civic revolutions for democracy.
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Book chapters on the topic "Constraint handler"

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Buchmann, A. P., R. S. Carrera, and M. A. Vazquez-Galindo. "Handling Constraints and their Exceptions: An Attached Constraint Handler for Object-Oriented CAD Databases." In Topics in Information Systems, 65–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-84374-7_6.

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Kumar, Praveen, Niranjan Dhanakoti, Srividya Gopalan, and V. Sridhar. "Constraint Based LSP Handover (CBLH) in MPLS Networks." In Networking - ICN 2005, 42–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-540-31957-3_6.

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Cruz, Jorge, and Pedro Barahona. "An Interval Constraint Approach to Handle Parametric Ordinary Differential Equations for Decision Support." In Principles and Practice of Constraint Programming – CP’99, 478–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-540-48085-3_35.

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Fernández, Eduardo, Maxime Collet, Simon Bauduin, Etienne Lemaire, and Pierre Duysinx. "Contributions to Handle Maximum Size Constraints in Density-Based Topology Optimization." In Advances in Structural and Multidisciplinary Optimization, 1054–68. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67988-4_80.

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Arabas, Jarosłlaw, Adam Szczepankiewicz, and Tomasz Wroniak. "Experimental Comparison of Methods to Handle Boundary Constraints in Differential Evolution." In Parallel Problem Solving from Nature, PPSN XI, 411–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15871-1_42.

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Mitra, Kishalay. "Chance Constrained Programming to Handle Uncertainty in Nonlinear Process Models." In Multi-Objective Optimization in Chemical Engineering, 183–215. Oxford, UK: John Wiley & Sons Ltd, 2013. http://dx.doi.org/10.1002/9781118341704.ch7.

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Agarwal, Pankaj K., Boris Aronov, Tzvika Geft, and Dan Halperin. "On Two-Handed Planar Assembly Partitioning with Connectivity Constraints." In Proceedings of the 2021 ACM-SIAM Symposium on Discrete Algorithms (SODA), 1740–56. Philadelphia, PA: Society for Industrial and Applied Mathematics, 2021. http://dx.doi.org/10.1137/1.9781611976465.105.

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Tsang, Edward, and Nanlin Jin. "Incentive Method to Handle Constraints in Evolutionary Algorithms with a Case Study." In Lecture Notes in Computer Science, 133–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11729976_12.

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Aguirre, Arturo Hernández, Salvador Botello Rionda, Carlos A. Coello Coello, and Giovanni Lizárraga Lizárraga. "Use of Multiobjective Optimization Concepts to Handle Constraints in Single-Objective Optimization." In Genetic and Evolutionary Computation — GECCO 2003, 573–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/3-540-45105-6_69.

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Scheidel, Arnim, Bunchhorn Lim, Kimchhin Sok, and Piseth Duk. "Leapfrogging Agricultural Development: Cooperative Initiatives Among Cambodian Small Farmers to Handle Sustainability Constraints." In Socio-Metabolic Perspectives on the Sustainability of Local Food Systems, 231–61. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-69236-4_8.

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Conference papers on the topic "Constraint handler"

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Vieira, Ana Sofia. "Consistency Management in Feature-Based Parametric Design." 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/detc1995-0237.

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Abstract One of the main problems to be solved in design-by-features is to preserve the semantic correctness of feature-based models. Currently, feature-based parametric design (FbPD) is being used as one of the most powerful approaches for solving this problem. In this paper, a fundamental principle of this approach is introduced. Three aspects stated, are: FbPD deals with functional design primitives, it solves the automatic generation of model variations, and it offers the basis for the development of a mechanism to check the semantic correctness of feature-based models. Several concepts for the definition of semantic constraints are presented. They instigate the classification of semantic constraints in four different categories, based on the constraint evaluation-time, purpose, behaviour, and representation. Sinfonia, a system for feature-based parametric design, is presented as a testbed environment for design-by-features applications. One of its modules, the Consistency Handler, uses the constraint concepts introduced in order to preserve the semantic consistency of the models. Several examples illustrate the different types of constraints. In addition, an algorithm applied for the process of a consistent feature modification is presented.
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Kamiyama, Naoto, Masahiko Aki, Takahito Sagane, Hiroshi Tajima, and Kazuto Seto. "Technique to Handle Local Constraints in Multibody Dynamics." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-85188.

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Sometimes we have a system that can be expressed basically by independent variables, with some redundant variable groups to decide only small parts of the system respectively. If the constrains of these redundant variables in each group are not coupled with each other, namely these are no common variables, we call them as local constraints. Example of local constrains are Euler parameter constraint and constrains of link mechanism of car suspension system. The necessity of redundant variables can also be limited for position level. Within the simple nonholonomic system we can always select the appropriate independent velocities to express the other velocity level variables. If the system has only local constraints, it is inefficient to use the typical DAE formulation, which handled all the constraints simultaneously. The technique we explain in this paper has advantage in calculation time and also in the sense of constrain stabilization. This paper gives a basic idea of the technique and its general formulation. Also three examples are explained which we used to confirm the effectiveness of the technique. We got a good result of constrains stabilization. More detailed examination about the calculation time and the constraint stabilization is planned in near future before we proceed to construct a simulation program of complex elastic vehicle model.
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Srinivasan, Raman V., Rajiv Agrawal, and Gary L. Kinzel. "Design Shell: A Framework for Interactive Parametric Design." In ASME 1990 Design Technical Conferences. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/detc1990-0035.

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Abstract This paper consists of a study of the mechanical engineering design methodology and the development of a computer-based framework for performing design. The framework, known as the Design Shell, provides the essential design tools, such as, constraint manager, nonlinear simultaneous equation solvers, optimizers, sensitivity analyzer, and graphics handler, in an interactive design environment. The design shell attempts to enhance the designer’s understanding of the relationships between the various design parameters and how these affect the overall design. As an illustration of the capabilities of the computer tool, the design of a torsion bar spring is presented in the paper.
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Barhorst, Alan A., and Louis J. Everett. "Obtaining the Minimal Set of Hybrid Parameter Differential Equations for Mechanisms." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0395.

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Abstract Mechanisms are inherently constrained devices. Combining flexibility with mechanisms usually requires using Lagrange multipliers to handle the constraints. The added algebraic or numerical tedium, associated with the Lagrange multipliers, is well documented. Presented in this paper is a technique for obtaining the minimal set of hybrid parameter differential equations for a constrained device. That is, the set of equations that inherently incorporate the constraints. The technique illustrated in this paper is a recently developed hybrid parameter multiple body (HPMB) system modeling methodology. The variational nature of the methodology allows rigorous equation formulation providing not only the complete nonlinear, hybrid differential equations, but also the boundary conditions. The methodology is formulated in the constraint-free subspace of the system’s configuration space, thus Lagrange multipliers are not needed for constrained systems, regardless of the constraint type (holonomic or nonholonomic). To evince the utility of the method, a flexible four bar mechanism is modeled. Particularly, the inversion of the slider crank found in the quick return mechanism. A comparison of Hamilton’s principle and the described technique, as they are applied to the mechanism, is included. It is shown that the same equations result from either method, but the new technique is much more concise, more efficiently handles the constraints, and requires less algebraic tedium.
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Sridhar, Natarajan, Rajiv Agrawal, and Gary L. Kinzel. "A Methodology to Handle Inequality Constraints in an Interactve Design Process." In ASME 1991 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/cie1991-0048.

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Abstract The treatment of mechanical design as a constraint management problem has long been related to equality constraints. Work involving inequality constraints has been generally restricted to optimization and symbolic computation. This paper presents a methodology for handling inequality constraints in an interactive mechanical design process. The presented method is similar to the basis interchange algorithm used in the Generalized Reduced Gradient (GRG) method for constrained nonlinear optimization. The main difference is that our method relies on user guidance to select which specification has to be changed in order to satisfy the violated inequality constraint. Also, the specification is only adjusted; unlike the procedure in the GRG method where the basis is changed. An inequality constraint violation is detected whenever the corresponding slack variable becomes negative. An occurrence-matrix formulation is used to represent both the equality and inequality constraints that govern the design. The work is illustrated for the classical weldment design problem.
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Nakagawa, Chihiro, Shunsuke Arakawa, Atsuhiko Shintani, and Tomohiro Ito. "Multibody Analysis of a Human and Inverted-Pendulum Vehicle With and Without a Handle–Hand Constraint." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12047.

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An inverted-pendulum vehicle is controlled by the movement of the user’s gravity center; however, detailed dynamic interaction between the vehicle and a user has not been clarified. In a previous basic study, we investigated the relationships between the user and vehicle in the case that the handle and hand are not constrained [3]. In the present study, we constructed a model that constrains the hand and handle, and simulated the situation of the vehicle accelerating. The coupling model was built using multibody dynamics. The vehicle was expressed by three rigid bodies and a user by eight rigid bodies. In the numerical simulation, it was found that the vehicle accelerates more quickly when there is a constraint linking the handle and hand. This is because the force imparted by the user’s hand, resulting in inclination of the vehicle in the traveling direction, is easily transmitted to the vehicle through the handle.
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Khan, Imad M., Kalyan C. Addepalli, and Mohammad Poursina. "Dynamics and Control of Multi-Flexible-Body Systems in a Divide-and-Conquer Scheme." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47264.

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In this paper, we present an extension of the generalized divide-and-conquer algorithm (GDCA) for modeling constrained multi-flexible-body systems. The constraints of interest in this case are not the motion constraints or the presence of closed kinematic loops but those that arise due to inverse dynamics or control laws. The introductory GDCA paper introduced an efficient methodology to include generalized constraint forces in the handle equations of motion of the original divide-and-conquer algorithm for rigid multibody systems. Here, the methodology is applied to flexible bodies connected by kinematic joints. We develop necessary equations that define the algorithm and present a well known numerical example to validate the method.
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Rao, Singiresu S., and Kiran K. Annamdas. "Particle Swarm Methodologies for Engineering Design Optimization." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87237.

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Particle swarm methodologies are presented for the solution of constrained mechanical and structural system optimization problems involving single or multiple objective functions with continuous or mixed design variables. The particle swarm optimization presented is a modified particle swarm optimization approach, with better computational efficiency and solution accuracy, is based on the use of dynamic maximum velocity function and bounce method. The constraints of the optimization problem are handled using a dynamic penalty function approach. To handle the discrete design variables, the closest discrete approach is used. Multiple objective functions are handled using a modified cooperative game theory approach. The applicability and computational efficiency of the proposed particle swarm optimization approach are demonstrated through illustrate examples involving single and multiple objectives as well as continuous and mixed design variables. The present methodology is expected to be useful for the solution of a variety of practical engineering design optimization problems.
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Dohmen, Maurice, Klaas Jan de Kraker, and Willem F. Bronsvoort. "Feature Validation in a Multiple-View Modeling System." In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/cie-1321.

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Abstract A new approach to specification and maintenance of feature validity conditions in a multiple-view feature modeling system is presented. Each view of a product contains a feature model. Features are specified declaratively in an object-oriented language, using constraints to specify feature validity conditions. Constraints are also used to specify relations between features. Validation of the feature models is done by a constraint manager that integrates different solving techniques. The constraint graph is mapped by the constraint manager onto constraints that are handled by dedicated solvers. If views are consistent, i.e. their feature models represent the same geometry, feature parameters can be changed. Changes are propagated through link constraints between different views.
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Mukherjee, Rudranarayan, and Pawel Malczyk. "Efficient Approach for Constraint Enforcement in Constrained Multibody System Dynamics." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-13296.

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We present an efficient and robust approach for enforcing the loop closure constraint at acceleration, velocity and position level in modeling multi-rigid body system dynamics. Our approach builds on the seminal ideas of the Divide and Conquer Algorithm (DCA) and the Augmented Lagrangian Method (ALM). The order-independent hierarchic assembly-disassembly process of the DCA provides an excellent opportunity for modularizing the system topology such that the loop closure constraints can be elegantly handled using constraint enforcement ideas motivated by the ALM. We present a non-iterative, user controlled constraint enforcement approach that enables robust constraint enforcement within the DCA. This approach eliminates the need for the iterative scheme found in many ALM motivated approaches. Similarly, it enables the use of relative or internal coordinates to model kinematic joint constraints not involved in the loop closure, thereby enforcing the constraints exactly for these joints. The approach also enables computationally very efficient serial and parallel implementations. Results from a number of test cases with single and couple closed loops are presented to demonstrate verification of the algorithm.
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