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Journal articles on the topic 'Mixed constraints. eng'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Singace, A. A., and H. El-Sobky. "Uniaxial crushing of constrained tubes." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 215, no. 3 (2001): 353–64. http://dx.doi.org/10.1243/0954406011520760.

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By changing the end constraints, the behaviour of mild steel and aluminium alloy tubes of relatively low D/ t ratio, subjected to an axial crushing load, is studied. Many combinations of end constraints were produced by radially constraining one or both ends of the loaded tube outwards, inwards or in both directions. Partially constrained mild steel and aluminium tubes are found to collapse into either a pure concertina mode or a pure diamond mode, depending on the ratio D/ t and the material characteristics. Mixed concertina-diamond modes would generally result by radially constraining the tu

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Hongli, Yang. "Study on Stochastic Linear Quadratic Optimal Control with Quadratic and Mixed Terminal State Constraints." Journal of Applied Mathematics 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/674327.

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This paper studies the indefinite stochastic LQ control problem with quadratic and mixed terminal state equality constraints, which can be transformed into a mathematical programming problem. By means of the Lagrangian multiplier theorem and Riesz representation theorem, the main result given in this paper is the necessary condition for indefinite stochastic LQ control with quadratic and mixed terminal equality constraints. The result shows that the different terminal state constraints will cause the endpoint condition of the differential Riccati equation to be changed. It coincides with the i

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Hasan, Mohammed Zaki, and Tat-Chee Wan. "Optimized Quality of Service for Real-Time Wireless Sensor Networks Using a Partitioning Multipath Routing Approach." Journal of Computer Networks and Communications 2013 (2013): 1–18. http://dx.doi.org/10.1155/2013/497157.

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Multimedia sensor networks for real-time applications have strict constraints on delay, packet loss, and energy consumption requirements. For example, video streaming in a disaster-management scenario requires careful handling to ensure that the end-to-end delay is within the acceptable range and the video is received properly without any distortion. The failure to transmit a video stream effectively occurs for many reasons, including sensor function limitations, excessive power consumption, and a lack of routing reliability. We propose a novel mathematical model for quality of service (QoS) r

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Ferber, Aaron, Bryan Wilder, Bistra Dilkina, and Milind Tambe. "MIPaaL: Mixed Integer Program as a Layer." Proceedings of the AAAI Conference on Artificial Intelligence 34, no. 02 (2020): 1504–11. http://dx.doi.org/10.1609/aaai.v34i02.5509.

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Machine learning components commonly appear in larger decision-making pipelines; however, the model training process typically focuses only on a loss that measures average accuracy between predicted values and ground truth values. Decision-focused learning explicitly integrates the downstream decision problem when training the predictive model, in order to optimize the quality of decisions induced by the predictions. It has been successfully applied to several limited combinatorial problem classes, such as those that can be expressed as linear programs (LP), and submodular optimization. Howeve

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Keogh, Fiona, Tom Pierse, and Eamon O'Shea. "96 Service Priorities for People with Dementia in Ireland: A Mixed Methods Study of Health Care Professionals." Age and Ageing 48, Supplement_3 (2019): iii17—iii65. http://dx.doi.org/10.1093/ageing/afz103.57.

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Abstract Background Public services for people with dementia living in the community face significant resource constraints. The aims of this study are to identify an optimum mix of services for six dementia case types and to gain a greater understanding of the resource allocation decision making process. Methods Irish datasets were used to identify dementia cases types representing 46% of cases in the datasets. Vignettes were prepared for six case types ranging from low to high dependency and needs. Carers, people with dementia and health and social care professionals (HSCPs) took part in mixe

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Lesaint, D., D. Mehta, B. O'Sullivan, L. Quesada, and N. Wilson. "Developing Approaches for Solving a Telecommunications Feature Subscription Problem." Journal of Artificial Intelligence Research 38 (June 19, 2010): 271–305. http://dx.doi.org/10.1613/jair.2992.

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Call control features (e.g., call-divert, voice-mail) are primitive options to which users can subscribe off-line to personalise their service. The configuration of a feature subscription involves choosing and sequencing features from a catalogue and is subject to constraints that prevent undesirable feature interactions at run-time. When the subscription requested by a user is inconsistent, one problem is to find an optimal relaxation, which is a generalisation of the feedback vertex set problem on directed graphs, and thus it is an NP-hard task. We present several constraint programming form

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Biruk, S., P. Jaskowski, and M. Krzemiński. "Model of Construction Subcontractors Selection with Time Windows for their Availability." Archives of Civil Engineering 65, no. 4 (2019): 295–307. http://dx.doi.org/10.2478/ace-2019-0061.

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AbstractMost construction projects involve subcontracting some work packages. A subcontractor is employed on the basis of their bid as well as according to their availability. A viable schedule must account for resource availability constraints. These resources (e.g. crews, subcontractors) engage in many projects, so they become at the disposal for a new project only in certain periods. One of the key tasks of a planner is thus synchronizing the work of resources between concurrent projects. The paper presents a mathematical model of the problem of selecting subcontractors or general contracto

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Meakins, Felicity, and Carmel O’Shannessy. "Typological constraints on verb integration in two Australian mixed languages,." Journal of Language Contact 5, no. 2 (2012): 216–46. http://dx.doi.org/10.1163/19552629-006001001.

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Abstract Gurindji Kriol and Light Warlpiri are two mixed languages spoken in northern Australia by Gurindji and Warlpiri people, respectively. Both languages are the outcome of the fusion of a contact variety of English (Kriol/Aboriginal English) with a traditional Australian Aboriginal language (Gurindji or Warlpiri). The end result is two languages which show remarkable structural similarity. In both mixed languages, pronouns, TMA auxiliaries and word order are derived from Kriol/Aboriginal English, and case-marking and other nominal morphology come from Gurindji or Warlpiri. These structura

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Wang, Hailing, Xu Lei, Zhichao Zhan, Li Yao, and Xia Wu. "A New fMRI Informed Mixed-Norm Constrained Algorithm for EEG Source Localization." IEEE Access 6 (2018): 8258–69. http://dx.doi.org/10.1109/access.2018.2792442.

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Ahmed, Naveed, Alexander Linke, and Christian Merdon. "Towards Pressure-Robust Mixed Methods for the Incompressible Navier–Stokes Equations." Computational Methods in Applied Mathematics 18, no. 3 (2018): 353–72. http://dx.doi.org/10.1515/cmam-2017-0047.

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AbstractIn this contribution, we review classical mixed methods for the incompressible Navier–Stokes equations that relax the divergence constraint and are discretely inf-sup stable. Though the relaxation of the divergence constraint was claimed to be harmless since the beginning of the 1970s, Poisson locking is just replaced by another more subtle kind of locking phenomenon, which is sometimes called poor mass conservation and led in computational practice to the exclusion of mixed methods with low-order pressure approximations like the Bernardi–Raugel or the Crouzeix–Raviart finite element m

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Zhang, Ningyu, Qian Zhou, and Haoming Hu. "Minimum Frequency and Voltage Stability Constrained Unit Commitment for AC/DC Transmission Systems." Applied Sciences 9, no. 16 (2019): 3412. http://dx.doi.org/10.3390/app9163412.

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An increased use of the high-voltage direct current (HVDC) technologies can have important effects on frequency performance and voltage stability of the receiving-end grid during normal operation as well as during blocking failure. The main reasons are the inherent characteristics of the HVDC such as its much larger capacity than thermal plants and lack of voltage supporting ability to the alternating current (AC) grid. These has led to new challenges for AC/direct current (DC) power grid operators in terms of ensuring power system security. To address these challenges, a unit commitment (UC)

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Tirkeş, Güzin, Neşe Çelebi, and Cenk Güray. "Developing a Multi-Stage Production Planning and Scheduling Model for a Small-Size Food and Beverage Company." Journal Européen des Systèmes Automatisés 54, no. 2 (2021): 273–81. http://dx.doi.org/10.18280/jesa.540209.

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A great deal of research has been undertaken in recent years related to facility capacity expansion and production planning problems under deterministic and stochastic constraints in the literature. However, only a small portion of this work directly addresses the issues faced by the food and beverage industry, especially in small-sized enterprises. In this study, a Mixed-Integer Linear Programming model (MILP) is developed for production planning and scheduling decisions for a small-size company producing syrup and jam products. The main constraint is that the multiple syrup and jam productio

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Claes, Jeroen. "Cognitive and geographic constraints on morphosyntactic variation." Current trends in analyzing syntactic variation 31 (December 31, 2017): 30–55. http://dx.doi.org/10.1075/bjl.00002.cla.

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Abstract In this paper, I examine whether the variation patterns of haber pluralization (e.g., hubo/hubieron fiestas ‘there was/were parties’) in Peninsular Spanish corroborate the hypothesis elaborated in earlier work that the phenomenon constitutes a competition between two variants of the presentational construction with haber that is constrained by domain-general cognitive constraints on spreading activation. In addition, this paper examines whether haber pluralization is incrementing in frequency in particular Peninsular regions and whether or not the phenomenon is spreading geographicall

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Gong, Yongshun, Tiantian Xu, Xiangjun Dong, and Guohua Lv. "e-NSPFI: Efficient Mining Negative Sequential Pattern from Both Frequent and Infrequent Positive Sequential Patterns." International Journal of Pattern Recognition and Artificial Intelligence 31, no. 02 (2017): 1750002. http://dx.doi.org/10.1142/s0218001417500021.

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Negative sequential patterns (NSPs), which focus on nonoccurring but interesting behaviors (e.g. missing consumption records), provide a special perspective of analyzing sequential patterns. So far, very few methods have been proposed to solve for NSP mining problem, and these methods only mine NSP from positive sequential patterns (PSPs). However, as many useful negative association rules are mined from infrequent itemsets, many meaningful NSPs can also be found from infrequent positive sequences (IPSs). The challenge of mining NSP from IPS is how to constrain which IPS could be available use

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Marín-Cano, Cristian Camilo, Juan Esteban Sierra-Aguilar, Jesús M. López-Lezama, Álvaro Jaramillo-Duque, and Juan G. Villegas. "A Novel Strategy to Reduce Computational Burden of the Stochastic Security Constrained Unit Commitment Problem." Energies 13, no. 15 (2020): 3777. http://dx.doi.org/10.3390/en13153777.

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The uncertainty related to the massive integration of intermittent energy sources (e.g., wind and solar generation) is one of the biggest challenges for the economic, safe and reliable operation of current power systems. One way to tackle this challenge is through a stochastic security constraint unit commitment (SSCUC) model. However, the SSCUC is a mixed-integer linear programming problem with high computational and dimensional complexity in large-scale power systems. This feature hinders the reaction times required for decision making to ensure a proper operation of the system. As an altern

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Sun, Chein-Chung, Hung-Yuan Chung, and Wen-Jer Chang. "H 2 ∕ H ∞ Robust Static Output Feedback Control Design via Mixed Genetic Algorithm and Linear Matrix Inequalities." Journal of Dynamic Systems, Measurement, and Control 127, no. 4 (2004): 715–22. http://dx.doi.org/10.1115/1.2098967.

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This paper is concerned with the synthesis of a mixed H2∕H∞ robust static output feedback with a bounded control bandwidth for continuous-time uncertainty systems. To this end, genetic algorithms and a linear matrix inequality solver are employed to regulate the static output feedback gains and to examine the Lyapunov stability conditions, respectively. The fitness function of this paper, which is called a hierarchical fitness function structure (HFFS), is able to deal with the stability conditions and the performance constraints in turn. This HFFS not only saves computing time but can also id

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Murawski, S. A., and J. T. Finn. "Optimal Effort Allocation Among Competing Mixed-Species Fisheries, Subject to Fishing Mortality Constraints." Canadian Journal of Fisheries and Aquatic Sciences 43, no. 1 (1986): 90–100. http://dx.doi.org/10.1139/f86-010.

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A linear programming (LP) approach to effort allocation among two or more fisheries (fleets) exploiting several common species/stocks is described and applied to otter trawl fisheries exploiting demersal fish stocks on Georges Bank (northeastern United States). Total instantaneous fishing mortality on a particular species (i) is computed as the linear summation of fishing mortalities generated by each fishery (j):[Formula: see text]where fj is the amount of standardized fishing effort exerted in fishery j and qij is the catchability coefficient for species i taken in fishery j. Mortality on sp

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ARAPOGLU, SAVAŞ, and CIHAN SAÇLIOGLU. "A NONCRITICAL RAMOND–NEVEU–SCHWARZ STRING WITH ONE END FIXED." International Journal of Modern Physics A 21, no. 01 (2006): 185–204. http://dx.doi.org/10.1142/s0217751x06022798.

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We study a Ramond–Neveu–Schwarz string with one end fixed on a D0-brane and the other end free as a qualitative guide to the spectrum of hadrons containing one very heavy quark. The mixed boundary conditions break half of the worldsheet supersymmetry and allow only odd α and even d modes in the Ramond sector, while the Neveu–Schwarz oscillators b's become odd-integer moded. Boson-fermion masses can still be matched if space–time is nine-dimensional; thus SO(8) triality still plays a role in the spectrum, although full space–time supersymmetry does not survive. We quantize the system in a tempo

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Leal Neto, Onicio, Simon Haenni, John Phuka, et al. "Combining Wearable Devices and Mobile Surveys to Study Child and Youth Development in Malawi: Implementation Study of a Multimodal Approach." JMIR Public Health and Surveillance 7, no. 3 (2021): e23154. http://dx.doi.org/10.2196/23154.

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Background Multimodal approaches have been shown to be a promising way to collect data on child development at high frequency, combining different data inputs (from phone surveys to signals from noninvasive biomarkers) to understand children’s health and development outcomes more integrally from multiple perspectives. Objective The aim of this work was to describe an implementation study using a multimodal approach combining noninvasive biomarkers, social contact patterns, mobile surveying, and face-to-face interviews in order to validate technologies that help us better understand child devel

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Kien, Bui Trong, Xiaolong Qin, Ching-Feng Wen, and Jen-Chih Yao. "Second-Order Optimality Conditions for Multiobjective Optimal Control Problems with Mixed Pointwise Constraints and Free Right End Point." SIAM Journal on Control and Optimization 58, no. 4 (2020): 2658–77. http://dx.doi.org/10.1137/19m1281770.

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Li, Jiawei, Jianghong Zeng, Zhengke Ye, and Xiangrong Huang. "Are Clean Technologies More Effective Than End-of-Pipe Technologies? Evidence from Chinese Manufacturing." International Journal of Environmental Research and Public Health 18, no. 8 (2021): 4012. http://dx.doi.org/10.3390/ijerph18084012.

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An increasing number of manufacturing enterprises are adopting environmental technologies to cope with the increasingly severe environmental regulatory pressure, but the existing studies about the impact of environmental technologies on economic performance come up with mixed results. This paper contributes to the literature by using the financial constraints and market advantages as a dual mediating process in this relationship. An empirical test using a sample of Chinese manufacturing enterprises listed in the Shanghai and Shenzhen exchange from 2011 to 2018 is established. The results of re

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Zhang, Yanfei, Xuran Liang, Chao Wang, Zhenmin Jin, Lüyun Zhu, and Wei Gan. "Experimental constraints on the partial melting of sediment-metasomatized lithospheric mantle in subduction zones." American Mineralogist 105, no. 8 (2020): 1191–203. http://dx.doi.org/10.2138/am-2020-7403.

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Abstract Sedimentary diapirs can be relaminated to the base of the lithosphere during slab subduction, where they can interact with the ambient lithospheric mantle to form variably metasomatized zones. Here, high-pressure experiments in sediment-harzburgite systems were conducted at 1.5–2.5 GPa and 800–1300 °C to investigate the interaction between relaminated sediment diapirs and lithospheric mantle. Two end-member processes of mixed experiments and layered (reaction) experiments were explored. In the first end-member, sediment and harzburgite powders were mixed to a homogeneous proportion (1

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Kleerebezem, R., M. F. Temudo, M. C. M. van Loosdrecht, and J. Rodríguez. "Modeling mixed culture fermentations; the role of different electron carriers." Water Science and Technology 57, no. 4 (2008): 493–97. http://dx.doi.org/10.2166/wst.2008.094.

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A recently established mixed culture fermentation (MCF) model has been modified to account for the role of different electron carriers in the process. The MCF-model predicts the product spectrum as a function of the actual environmental conditions using a thermodynamic optimization criterion while satisfying a number of constraints. Other improvements made to the original model are the inclusion of formate as fermentation end-product, and gas-liquid mass transfer. The model is adequately capable of reproducing experimental results in terms of butyrate and formate versus hydrogen/carbon dioxide

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Weyland, Kurt. "Neoliberalism and Democracy in Latin America: A Mixed Record." Latin American Politics and Society 46, no. 1 (2004): 135–57. http://dx.doi.org/10.1111/j.1548-2456.2004.tb00268.x.

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AbstractThis essay argues that neoliberalism has strengthened the sustainability of democracy in Latin America but limited its quality. Drastic market reform seems to have abetted the survival of competitive civilian rule through its external and internal repercussions. By opening up Latin American countries to the world economy, neoliberalism has exposed them to more of the international pressures for preserving democracy that intensified with the end of the Cold War. At the same time, the move to market economics has weakened leftist parties, trade unions, and other proponents of radical soc

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Dai, Xin Hua, Wan Liang Wang, Yan Wei Zhao, and H. X. Teng. "Double-Workshop Plan Model of Mixed Chlor-Alkali Production Process." Advanced Materials Research 69-70 (May 2009): 611–15. http://dx.doi.org/10.4028/www.scientific.net/amr.69-70.611.

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Double-workshop mixed chlor-alkali planned model production process is a multi-level multi-product multi-constraint mixed batch planning problem production line model, taking into account the actual production of joint production of dual-workshop mode of production to determine the products and materials at various workshops, various Plan period on the production quantity, at the end of each period to meet the delivery needs of the type and quantity simultaneously, during the product implementation plan the goal of profit maximization. It uses particle swarm algorithm to reach the answer, indi

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Skiba, Alexander K., and Nadezhda K. Skiba. "Theoretical Estimate of the Total Shelf Length in a Gas Fields Model." Open Computer Science 11, no. 1 (2021): 355–64. http://dx.doi.org/10.1515/comp-2020-0224.

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Abstract The authors consider a continuous dynamic approximating model of a gas fields group and, on its basis, set maximum and minimum issues. The tasks proposed for research are optimal control problems with mixed constraints with free-final-time and moving right end. We analytically solve the rapid-action problem. The central mathematical apparatus is Pontryagin maximum principle in Arrow form, using Lagrange multipliers. The theoretically obtained results of the analysis are of particular interest.

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Dayarian, Iman, Timothy C. Y. Chan, David Jaffray, and Teo Stanescu. "A mixed-integer optimization approach for homogeneous magnet design." TECHNOLOGY 06, no. 02 (2018): 49–58. http://dx.doi.org/10.1142/s2339547818500036.

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Magnetic resonance imaging (MRI) is a powerful diagnostic tool that has become the imaging modality of choice for soft-tissue visualization in radiation therapy. Emerging technologies aim to integrate MRI with a medical linear accelerator to form novel cancer therapy systems (MR-linac), but the design of these systems to date relies on heuristic procedures. This paper develops an exact, optimization-based approach for magnet design that 1) incorporates the most accurate physics calculations to date, 2) determines precisely the relative spatial location, size, and current magnitude of the magne

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BARTLETT, STEPHEN D., HOWARD M. WISEMAN, ROBERT W. SPEKKENS, and ANDREW C. DOHERTY. "MIXED-STATE ENTANGLEMENT IN THE LIGHT OF PURE-STATE ENTANGLEMENT CONSTRAINED BY SUPERSELECTION RULES." International Journal of Quantum Information 03, supp01 (2005): 145–53. http://dx.doi.org/10.1142/s021974990500133x.

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We show that the classification of bi-partite pure entangled states when local quantum operations are restricted, e.g., constrained by local superselection rules, yields a structure that is analogous in many respects to that of mixed-state entanglement, including such exotic phenomena as bound entanglement and activation. This analogy aids in resolving several conceptual puzzles in the study of entanglement under restricted operations. Specifically, we demonstrate that several types of quantum optical states that possess confusing entanglement properties are analogous to bound entangled states

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Madden, L. V., and P. A. Paul. "An Assessment of Mixed-Modeling Approaches for Characterizing Profiles of Time-Varying Response and Predictor Variables." Phytopathology® 100, no. 10 (2010): 1015–29. http://dx.doi.org/10.1094/phyto-01-10-0001.

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A general statistical modeling approach was tested for characterizing the relationship between pathogen inoculum density (or other biological response variables) and environmental variables when the data are collected as temporal profiles of observations within multiple locations or years. The approach, based on the use of linear mixed models, simultaneously accounts for serial correlations of the observations within each time profile, the random effects of location–year (or other grouping factors), and the cross-correlation of the environmental variables, and is appropriate when the environme

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Couespel, Damien, Marina Lévy, and Laurent Bopp. "Oceanic primary production decline halved in eddy-resolving simulations of global warming." Biogeosciences 18, no. 14 (2021): 4321–49. http://dx.doi.org/10.5194/bg-18-4321-2021.

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Abstract. The decline in ocean primary production is one of the most alarming consequences of anthropogenic climate change. This decline could indeed lead to a decrease in marine biomass and fish catch, as highlighted by recent policy-relevant reports. Because of computational constraints, current Earth system models used to project ocean primary production under global warming scenarios have to parameterize flows occurring below the resolution of their computational grid (typically 1∘). To overcome these computational constraints, we use an ocean biogeochemical model in an idealized configura

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Zhu, Huai Nian, Cheng Ke Zhang, Pei Hong Sun, and Ning Bin. "A Stackelberg Game Approach to Mixed H₂/H_∞ Robust Control for Singular Bilinear Systems." Advanced Materials Research 204-210 (February 2011): 1839–47. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.1839.

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The H2/ H∞robust control problem is formulated as a Stackelberg differential game where the leader minimizes an H2criterion while the follower deals with the H∞ constraint. For a closed-loop information structure in the game, the necessary conditions for the existence of a solution are derived for the infinite horizon case. In the end, the simulation of a numerical example is presented.

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Kress, Bernard C., and Ishan Chatterjee. "Waveguide combiners for mixed reality headsets: a nanophotonics design perspective." Nanophotonics 10, no. 1 (2020): 41–74. http://dx.doi.org/10.1515/nanoph-2020-0410.

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AbstractThis paper is a review and analysis of the various implementation architectures of diffractive waveguide combiners for augmented reality (AR), mixed reality (MR) headsets, and smart glasses. Extended reality (XR) is another acronym frequently used to refer to all variants across the MR spectrum. Such devices have the potential to revolutionize how we work, communicate, travel, learn, teach, shop, and are entertained. Already, market analysts show very optimistic expectations on return on investment in MR, for both enterprise and consumer applications. Hardware architectures and technol

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Paradis, Johanne, Elena Nicoladis, and Fred Genesee. "Early emergence of structural constraints on code-mixing: evidence from French–English bilingual children." Bilingualism: Language and Cognition 3, no. 3 (2000): 245–61. http://dx.doi.org/10.1017/s1366728900000365.

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Does young bilingual children's code-mixing obey the same structural constraints as bilingual adults' code-mixing? The present study addresses this question using code-mixing data from 15 French–English bilingual children filmed in conversation with both parents at six-month intervals from the age of 2;0 to 3;6. The children's code-mixed utterances were examined for violations of the principles set out in the Matrix-Language Frame model (e.g. Myers-Scotton, 1993, 1997). The results show that the children obeyed all the constraints set out in the Matrix Language Frame model the majority of the

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Yu, Yao, Jinxian Weng, and Wanying Zhu. "Optimizing Strategies for the Urban Work Zone with Time Window Constraints." Sustainability 11, no. 15 (2019): 4218. http://dx.doi.org/10.3390/su11154218.

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Work zones that move with road maintenance tasks are enclosing and have caused severe traffic jams and the significant decline of road capacity. This paper proposes an intelligent-based multi-objects road maintenance optimization strategy based on a practical origin–destination (OD) matrix and complicated work schedules over a real urban road network. It focuses on the optimization of multi short-term maintenance tasks and the minimization of average travel delay for vehicles passing through. By taking the driving characteristic into account, static and dynamic variable speed limit strategies

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Boudane, Abdelhamid, Saïd Jabbour, Lakhdar Sais, and Yakoub Salhi. "SAT-Based Data Mining." International Journal on Artificial Intelligence Tools 27, no. 01 (2018): 1840002. http://dx.doi.org/10.1142/s021821301840002x.

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Several propositional satisfiability (SAT) based encodings have been proposed to deal with various data mining problems including itemset and sequence mining problems. This research issue allows to model data mining problems in a declarative way, while exploiting efficient SAT solving techniques. In this paper, we overview our contributions on the application of propositional satisfiability (SAT) to model and solve itemset mining tasks. We first present a SAT based encoding of frequent closed itemset mining task as a propositional formula whose models corresponds to the patterns to be mined. S

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Aygün, Mehmet Murat, Yusuf Çağrı Öğüt, Hulusi Baysal, and Yiğit Taşcıoğlu. "Visuo-Haptic Mixed Reality Simulation Using Unbound Handheld Tools." Applied Sciences 10, no. 15 (2020): 5344. http://dx.doi.org/10.3390/app10155344.

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Visuo-haptic mixed reality (VHMR) adds virtual objects to a real scene and enables users to see and also touch them via a see-through display and a haptic device. Most studies with kinesthetic feedback use general-purpose haptic devices, which require the user to continuously hold an attached stylus. This approach constrains users to the mechanical limits of the device even when it is not needed. In this paper, we propose a novel VHMR concept with an encountered-type haptic display (ETHD), which consists of a precision hexapod positioner and a six-axis force/torque transducer. The main contrib

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McGill, Mark, Julie Williamson, Alexander Ng, Frank Pollick, and Stephen Brewster. "Challenges in passenger use of mixed reality headsets in cars and other transportation." Virtual Reality 24, no. 4 (2019): 583–603. http://dx.doi.org/10.1007/s10055-019-00420-x.

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AbstractThis paper examines key challenges in supporting passenger use of augmented and virtual reality headsets in transit. These headsets will allow passengers to break free from the restraints of physical displays placed in constrained environments such as cars, trains and planes. Moreover, they have the potential to allow passengers to make better use of their time by making travel more productive and enjoyable, supporting both privacy and immersion. However, there are significant barriers to headset usage by passengers in transit contexts. These barriers range from impediments that would

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Hu, Hongtao, Haotian Xiong, Yuanfeng You, and Wei Yan. "A Mixed Integer Programming Model for Supplier Selection and Order Allocation Problem with Fuzzy Multiobjective." Scientific Programming 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/9346781.

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A mixed integer programming model is proposed to solve supplier selection and order allocation problem for a manufacturer. In this model, quality, delivery performance, and purchasing cost are chosen as three criteria to select suppliers and set as objectives. Inventory level, goods flow balance, service level, supply ability, and marketing demand are considered as constraints. In the proposed model, the three objectives have different weights which are given by experts. However, the experts score the weight by many subjective factors. So, the fuzzy analytic hierarchy process (FAHP) based appr

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Kucharzak, Michał, Dawid Zydek, and Iwona Poźniak-Koszałka. "Overlay Multicast Optimization: IBM ILOG CPLEX." International Journal of Electronics and Telecommunications 58, no. 4 (2012): 381–88. http://dx.doi.org/10.2478/v10177-012-0052-0.

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Abstract IBM ILOG CPLEX Optimization Studio delivers advanced and complex optimization libraries that solve linear programming (LP) and related problems, e.g., mixed integer. Moreover, the optimization tool provides users with its Academic Research Edition, which is available for teaching and noncommercial research at no-charge. This paper describes the usage of CPLEX C++ API for solving linear problems and, as an exhaustive example, optimization of network flows in overlay multicast is taken into account. Applying continuous and integral variables and implementing various constraints, includi

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Nabavi, S. Nader, Alireza Akbarzadeh, and Saeed Abolghasemi. "A Method for Solving Dynamic Equations of a 3-PRR Parallel Robot." Applied Mechanics and Materials 232 (November 2012): 414–18. http://dx.doi.org/10.4028/www.scientific.net/amm.232.414.

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In this paper, kinematic relationships for a 3-PRR planar parallel robot are first presented. The robot dynamics equations are formulated using Lagrange equations of first kind. The derived equations are a mixed set of differential and algebraic constraint equations, DAE, which must be satisfied simultaneously. In order to solve the robot dynamic equations, a new method is presented in which the dynamics equation is first partitioned into two parts. The constraint equations and the dependent coordinates are next eliminated. This reduces the dynamic equations to a set of differential equations

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Pita, James, Manish Jain, Fernando Ordóñez, et al. "Using Game Theory for Los Angeles Airport Security." AI Magazine 30, no. 1 (2009): 43. http://dx.doi.org/10.1609/aimag.v30i1.2173.

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Security at major locations of economic or political importance is a key concern around the world, particularly given the threat of terrorism. Limited security resources prevent full security coverage at all times, which allows adversaries to observe and exploit patterns in selective patrolling or monitoring, e.g. they can plan an attack avoiding existing patrols. Hence, randomized patrolling or monitoring is important, but randomization must provide distinct weights to different actions based on their complex costs and benefits. To this end, this paper describes a promising transition of the

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Ritari, Antti, Kirsi Spoof-Tuomi, Janne Huotari, Seppo Niemi, and Kari Tammi. "Emission Abatement Technology Selection, Routing and Speed Optimization of Hybrid Ships." Journal of Marine Science and Engineering 9, no. 9 (2021): 944. http://dx.doi.org/10.3390/jmse9090944.

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This paper evaluates the effect of a large-capacity electrical energy storage, e.g., Li-ion battery, on optimal sailing routes, speeds, fuel choice, and emission abatement technology selection. Despite rapid cost reduction and performance improvement, current Li-ion chemistries are infeasible for providing the total energy demand for ocean-crossing ships because the energy density is up to two orders of magnitude less than in liquid hydrocarbon fuels. However, limited distance zero-emission port arrival, mooring, and port departure are attainable. In this context, we formulate two groups of nu

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Sánchez Licea, Gerardo. "Sufficiency for Purely Essentially Bounded Optimal Controls." Symmetry 12, no. 2 (2020): 238. http://dx.doi.org/10.3390/sym12020238.

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For optimal control problems of Bolza with variable and free end-points, nonlinear dynamics, nonlinear isoperimetric inequality and equality restrictions, and nonlinear pointwise mixed time-state-control inequality and equality constraints, sufficient conditions for strong minima are derived. The algorithm used to prove the main theorem of the paper includes a crucial symmetric inequality, making this technique an independent self-contained method of classical concepts such as embedding theorems from ordinary differential equations, Mayer fields, Riccati equations, or Hamilton–Jacobi theory. M

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Plyushteva, Anna. "Exploring the Role of the Workplace in Experiences of Commuter Stress: A Mixed-Method Study from Sofia, Bulgaria." Social Sciences 10, no. 6 (2021): 208. http://dx.doi.org/10.3390/socsci10060208.

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Several studies have argued that the effects of commuter stress spill into other domains of everyday life, including the workplace. However, the entanglements between commuter stress and the workplace are complex and multidirectional. Commuter stresses both shapes and is shaped by managerial policies, workplace social relations, and the negotiations of working schedules. The present paper explores these interconnections. Drawing on a survey of 281 office-based employees in 27 companies in Sofia, Bulgaria, the paper demonstrates how the characteristics of individuals and individual journeys are

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Diewvilai, Radhanon, and Kulyos Audomvongseree. "Generation Expansion Planning with Energy Storage Systems Considering Renewable Energy Generation Profiles and Full-Year Hourly Power Balance Constraints." Energies 14, no. 18 (2021): 5733. http://dx.doi.org/10.3390/en14185733.

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This paper proposes a methodology to develop generation expansion plans considering energy storage systems (ESSs), individual generation unit characteristics, and full-year hourly power balance constraints. Generation expansion planning (GEP) is a complex optimization problem. To get a realistic plan with the lowest cost, acceptable system reliability, and satisfactory CO2 emissions for the coming decades, a complex multi-period mixed integer linear programming (MILP) model needs to be formulated and solved with individual unit characteristics along with hourly power balance constraints. This

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Ning, Liqiao, Peng Zhao, Wenkai Xu, and Ke Qiao. "Transfer Coordination for Metro Networks during the Start- or End-of-Service Period." Mathematical Problems in Engineering 2018 (July 3, 2018): 1–10. http://dx.doi.org/10.1155/2018/3835270.

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When travelling via metro networks during the start- or end-of-service period, transferring passengers may suffer a transfer failure. Accordingly, the synchronization timetabling problem necessitates consideration of transfer waiting time and transfer availability with respect to the first or last train. Hence, transfer train index (TTI) is formulated to identify the transfer train and calculate the transfer waiting time. Furthermore, two types of connection indexes, the last connection train index (LCTI) and the first connection train index (FCTI), are devised to distinguish transfer failure

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YILDIZBAŞI, Abdullah, Ahmet ÇALIK, Turan PAKSOY, Reza ZANJİRANİ FARAHANİ, and Gerhard-Wilhelm WEBER. "MULTI-LEVEL OPTIMIZATION OF AN AUTOMOTIVE CLOSED-LOOP SUPPLY CHAIN NETWORK WITH INTERACTIVE FUZZY PROGRAMMING APPROACHES." Technological and Economic Development of Economy 24, no. 3 (2018): 1004–28. http://dx.doi.org/10.3846/20294913.2016.1253044.

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Closed-Loop Supply Chain (CLSC) management has attained appreciable attention over the last few years. CLSC management allows companies to manage their recovery and recycling activities of end products. Due to the latest developments in the world, producers are responsible for the collection, refurbishing, repairing and disassembly of end products at the end of their lives. This paper develops a mixed-integer CLSC model that is inspired by the automotive industry. In this model, we consider three Decision Makers (DM): Plant, Dismantler Center and Customer. Each DM has individual objectives and

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Johnson, Leah, Craig M. Lee, and Eric A. D’Asaro. "Global Estimates of Lateral Springtime Restratification." Journal of Physical Oceanography 46, no. 5 (2016): 1555–73. http://dx.doi.org/10.1175/jpo-d-15-0163.1.

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AbstractSubmesoscale frontal dynamics are thought to be of leading-order importance for stratifying the upper ocean by slumping horizontal density gradients to produce vertical stratification. Presented here is an investigation of submesoscale instabilities in the mixed layer—mixed layer eddies (MLEs)—as a potential mechanism of frontal slumping that stratifies the upper ocean during the transition from winter to spring, when wintertime forcings weaken but prior to the onset of net solar warming. Observations from the global Argo float program are compared to predictions from a one-dimensional

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Xu, Lei, and Tsan Sheng Adam Ng. "A Robust Mixed-Integer Linear Programming Model for Mitigating Rail Transit Disruptions Under Uncertainty." Transportation Science 54, no. 5 (2020): 1388–407. http://dx.doi.org/10.1287/trsc.2020.0998.

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In this paper, we propose a two-stage robust optimization framework to evaluate widely controllable commuter flow strategies that can help mitigate uncertain disruption impacts on rail transit commuter flows. In the operation-as-usual stage, preemptive control strategies including timetable adjustment, commuter path choice diversion, and commuter trip starting time diversion are planned within budget and other requirement constraints. In the disruption stage, optimal contingency routing is derived to minimize disruption impacts. To this end, a linear programming model that simulates the commut

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Carlin, Ryan E., and Matthew M. Singer. "Support for Polyarchy in the Americas." Comparative Political Studies 44, no. 11 (2011): 1500–1526. http://dx.doi.org/10.1177/0010414011407471.

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This study measures support for the basic rights, liberties, and practices associated with polyarchy in 12 Latin American democracies. Specifically, it identifies five profiles of support for polyarchy’s core values and norms—public contestation, inclusive participation, limits on executive authority, and institutional checks and balances. Although citizens who fit the polyarch profile accept all of polyarchy’s principles, those who fit one of the four mixed support profiles ( power constrainer, power checker, power delegator, power restrainer) accept only some of them while rejecting other co

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