Research

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  • A Developer Chooses, a Player Obeys: a Study of the Enactment of Objectivism in BioShock
    A Developer Chooses, a Player Obeys: a Study of the Enactment of Objectivism in BioShock
    In 2003, Espen Aarseth proposed a framework for analyzing computer and video games, saying current methodologies borrowed too much from literature and film criticism, writing that video games exist in a “virtual environment” and that “this label fits games from Tetris to Drug Wars to EverQuest” (Aarseth, 2003, p.2). While it is fair to say that both Tetris and EverQuest are video games, this is all they have in common: Tetris is a game where a single player sorts falling geometric shapes while EverQuest is a Massively Multiplayer Online Role Playing Game with millions of players and a fantasy world similar to J. R. R. Tolkien’s The Lord of the Rings.
    A Diffusion Model Analysis of Decision Biases Affecting Delayed Recognition of Emotional Stimuli
    A Diffusion Model Analysis of Decision Biases Affecting Delayed Recognition of Emotional Stimuli
    Previous empirical work suggests that emotion can influence accuracy and cognitive biases underlying recognition memory, depending on the experimental conditions. The current study examines the effects of arousal and valence on delayed recognition memory using the diffusion model, which allows the separation of two decision biases thought to underlie memory: response bias and memory bias. Memory bias has not been given much attention in the literature but can provide insight into the retrieval dynamics of emotion modulated memory. Participants viewed emotional pictorial stimuli; half were given a recognition test 1-day later and the other half 7-days later. Analyses revealed that emotional valence generally evokes liberal responding, whereas high arousal evokes liberal responding only at a short retention interval. The memory bias analyses indicated that participants experienced greater familiarity with high-arousal compared to low-arousal items and this pattern became more pronounced as study-test lag increased; positive items evoke greater familiarity compared to negative and this pattern remained stable across retention interval. The findings provide insight into the separate contributions of valence and arousal to the cognitive mechanisms underlying delayed emotion modulated memory., Bowen HJ, Spaniol J, Patel R, Voss A (2016) A Diffusion Model Analysis of Decision Biases Affecting Delayed Recognition of Emotional Stimuli. PLoS ONE 11(1): e0146769.
    A Dynamic Stiffness Element for Free Vibration Analysis of Delaminated Layered Beams
    A Dynamic Stiffness Element for Free Vibration Analysis of Delaminated Layered Beams
    A dynamic stiffness element for flexural vibration analysis of delaminated multilayer beams is developed and subsequently used to investigate the natural frequencies and modes of two-layer beam configurations. Using the Euler-Bernoulli bending beam theory, the governing differential equations are exploited and representative, frequency-dependent, field variables are chosen based on the closed form solution to these equations. The boundary conditions are then imposed to formulate the dynamic stiffness matrix (DSM), which relates harmonically varying loads to harmonically varying displacements at the beam ends. The bending vibration of an illustrative example problem, characterized by delamination zone of variable length, is investigated. Two computer codes, based on the conventional Finite Element Method (FEM) and the analytical solutions reported in the literature, are also developed and used for comparison. The intact and defective beam natural frequencies and modes obtained from the proposed DSM method are presented along with the FEM and analytical results and those available in the literature., Erdelyi, N. H., & Hashemi, S. M. (2012). A dynamic stiffness element for free vibration analysis of delaminated layered beams. Modelling and Simulation in Engineering, 2012, 1-8. doi:10.1155/2012/492415
    A Framework for Extension of Dynamic Finite Element Formulation to Flexural Vibration Analysis of Thin Plates
    A Framework for Extension of Dynamic Finite Element Formulation to Flexural Vibration Analysis of Thin Plates
    Dynamic Finite Element formulation is a powerful technique that combines the accuracy of the exact analysis with wide applicability of the finite element method. The infinite dimensionality of the exact solution space of plate equation has been a major challenge for development of such elements for the dynamic analysis of flexible two-dimensional structures. In this research, a framework for such extension based on subset solutions is proposed. An example element is then developed and implemented in MAT LAB software for numerical testing, verification, and validation purposes. Although the presented formulation is not exact, the element exhibits good convergence characteristics and can be further enriched using the proposed framework., Elahi, M. M., & Hashemi, S. M. (2017). A Framework for Extension of Dynamic Finite ElementFormulation to Flexural Vibration Analysis of Thin Plates. Shock and Vibration, 2017, 1-10. doi:10.1155/2017/5905417
    A Framework for Integrating Human Factors into Work-System Design
    A Framework for Integrating Human Factors into Work-System Design
    This paper suggests a framework for helping companies integrate Human Factors (HF) considerations proactively into their development process. The interactive approach draws on activities aimed at successive stages in the development process: cognitive mapping of the strategic environment, process mapping of the design process, simulation of design alternatives, and development of metrics to support ongoing evaluation. Each initiative establishes a new dialogue in the company around how HF can be usefully integrated into design routines allowing stakeholders to adopt or adapt routines that include HF aspects as a regular part of the process of creating new work-systems.
    A Framework for Investigating the Value of Public Wireless Networks
    A Framework for Investigating the Value of Public Wireless Networks
    This paper investigates the value of deploying municipal wireless network infrastructure. By Vos's (2007c) estimate, there are more than 400 such networks, either deployed or in development in the United States. Many other wireless networks are operational, or being rolled out in cities around the world, including Toronto, London, Bologna, Singapore, Taipei and Perth. Developed by municipal governments, private providers or public-private partnerships, these networks are intended to serve the connectivity needs of local residents, tourists and business travellers., Middleton, C. (2007). A Framework for Investigating the Value of Public Wireless Networks. Paper for the 35th Research Conference on Communication, Information and Internet Policy (pp. 1-36).
    A GIS-Based Web Approach for Serving Land Price Information
    A GIS-Based Web Approach for Serving Land Price Information
    Participants in the land market are usually hampered to browse and analyze the land price information due to the lack of information sources and available analysis tools. A service-oriented GIS-based web system was developed to provide a practical solution, its essential data sources contain basic geographic elements and benchmark land price (BLP)-related information. Core models for land price analysis were implemented, including land price index, spatial distribution, and parcel appraisal. The system was developed based on a four-level Browse Server (B/S) architecture using GIS and web service technologies, which enables the publishing, browsing, and analysis of the land price information via the Internet. With effective functionalities, the system has been employed in a project for updating BLP in a case study city located in China. The main advantage of the GIS-based web approach lies in its integration of spatial-temporal analysis models and web GIS technology, which allows more investors and administrators with limited domain knowledge to obtain further understanding on the change pattern and spatial distribution of land price by an online means. The experience in the case study city demonstrates that the approach has strong practicality for land price information services., Yang, Y., Sun, Y., Li, S., Zhang, S., Wang, K., Hou, H., & Xu, S. (2015). A GIS-based web approach for serving land Price Information. ISPRS International Journal of Geo-Information, 4(4), 2078-2093. doi:10.3390/ijgi4042078, (This article belongs to the Special Issue Bridging the Gap between Geospatial Theory and Technology)
    A Geographic Visualization Approach to Multi-Criteria Evaluation of Urban Quality of Life
    A Geographic Visualization Approach to Multi-Criteria Evaluation of Urban Quality of Life
    This paper proposes to use principles of geographic visualization in conjunction with multi-criteria evaluation methods to support expert-level spatial decision-making. Interactive maps can be combined with analytical tools to explore various settings of multi-criteria evaluation parameters that define different decision-making strategies. In a case study, the analytic hierarchy process (AHP) is used to calculate composite measures of urban quality of life (QoL) for neighbourhoods in Toronto. The AHP allows for an interactive exploration of decision-making strategies, while offering a view on spatial patterns in the evaluation results. In particular, an interactive blending between a classical and a contemporary QoL model is supported. This feature is used in a pilot study to assess the usefulness of geographic visualization in urban QoL evaluation. Three user interviews provide positive feedback on the utility and usability of the tool that was operated by the investigator.
    A Geospatial Web Application to Map Observations and Opinions in Environmental Planning
    A Geospatial Web Application to Map Observations and Opinions in Environmental Planning
    The geospatial Web enables virtually everyone to contribute to the growing col-lection of geographically referenced information on the World-Wide Web. In this chapter, we present a Google Maps-based tool that enables Web users to contribute two types of informa-tion: annotations and their reference locations. We further differentiate annotations into obser-vations and opinions regarding specific places. The potential of this approach for integrating lo-cal knowledge into environmental planning was assessed by conducting an online map-based discussion of organic farming among expert stakeholders in the Kawarthas area in Central On-tario, Canada. The discussion contents shed light on the participants’ perceptions of the organic food market. Moreover, the experiment demonstrated how a map-based discussion forum can be useful for obtaining public input on planning and policy issues.
    A Graph theory approach for geovisualization of land use change: An application to Lisbon
    A Graph theory approach for geovisualization of land use change: An application to Lisbon
    Urban sprawl and growth has experienced increased concern in geographic and environmental literature. Preceding the existence of robust frameworks found in regional and urban planning, as well as urban geography and economics, the spatial properties of allocation of urban land use are still far from being completely understood. This is largely due to the underlying complexity of the change found at spatial level of urban land use, merging social, economic and natural drivers. The spatial patterns formed, and the connectivity established among the different subsets of land-use types, becomes a complex network of interactions over time, helping to shape the structure of the city. The possibility to merge the configuration of land-use with complex networks may be assessed elegantly through graph theory. Nodes and edges can become abstract representations of typologies of space and are represented into a topological space of different land use types which traditionally share common spatial boundaries. Within a regional framework, the links between adjacent and neighboring urban land use types become better understood, by means of a Kamada-Kawai algorithm. This study uses land use in Lisbon over three years, 1990, 2000 and 2006, to develop a Kamada-Kawai graph interpretation of land-use as a result of neighboring power. The rapid change witnessed in Lisbon since the nineties, as well as the availability of CORINE Land Cover data in these three time stamps, permits a reflection on anthropogenic land-use change in urban and semi-urban areas in Portugal’s capital. This paper responds to (1) the structure and connectivity of urban land use over time, demonstrating that most of the agricultural land is stressed to transform to urban, gaining a central role in future. (2) Offer a systemic approach to land-use transitions generating what we call spatial memory, where land use change is often unpredictable over space, but becomes evident in a graph theory framework, and (3) advance in the geovisual understanding of spatial phenomena in land use transitions by means of graph theory. Thus, the structure of this combined method enables urban and landscape to have a better understanding of the spatial interaction of land-use types within the city, promoting an elegant solution to rapid geovisualization for land-use management in general.
    A Hybrid Spatio-Temporal Data Indexing Method for Trajectory Databases
    A Hybrid Spatio-Temporal Data Indexing Method for Trajectory Databases
    In recent years, there has been tremendous growth in the field of indoor and outdoor positioning sensors continuously producing huge volumes of trajectory data that has been used in many fields such as location-based services or location intelligence. Trajectory data is massively increased and semantically complicated, which poses a great challenge on spatio-temporal data indexing. This paper proposes a spatio-temporal data indexing method, named HBSTR-tree, which is a hybrid index structure comprising spatio-temporal R-tree, B*-tree and Hash table. To improve the index generation efficiency, rather than directly inserting trajectory points, we group consecutive trajectory points as nodes according to their spatio-temporal semantics and then insert them into spatio-temporal R-tree as leaf nodes. Hash table is used to manage the latest leaf nodes to reduce the frequency of insertion. A new spatio-temporal interval criterion and a new node-choosing sub-algorithm are also proposed to optimize spatio-temporal R-tree structures. In addition, a B*-tree sub-index of leaf nodes is built to query the trajectories of targeted objects efficiently. Furthermore, a database storage scheme based on a NoSQL-type DBMS is also proposed for the purpose of cloud storage. Experimental results prove that HBSTR-tree outperforms TB*-tree in some aspects such as generation efficiency, query performance and query type., Ke, S., Gong, J., Li, S., Zhu, Q., Liu, X., & Zhang, Y. (2014). A hybrid spatio-temporal data indexing method for trajectory databases. Sensors, 14(7), 12990-13005. doi:10.3390/s140712990, (This article belongs to the Section Physical Sensors)
    A Latin-American Parents' Group Participates in their Children's Schooling: Parent Involvement Reconsidered
    A Latin-American Parents' Group Participates in their Children's Schooling: Parent Involvement Reconsidered
    Online version of an article originally published as: Bernhard, J. K., Freire, M., Pacini-Ketchabaw, V. & Villanueva, V. (1998). A Latin American parents' group participates in their children's schooling: Parent involvement reconsidered. Canadian Ethnic Studies Journal 30(3):77-98.