Sohei Okamoto

University of Nevada, Reno, Reno, NV, United States

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Publications (10)0 Total impact

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    ABSTRACT: Researchers in environmental sciences work with datasets that have a large variety of data structures and file formats. Consequently, for data and model interoperability, it is essential to have the right tools for converting from a given data structure to another, and from a specific file format to another. In this paper, we propose an original web-enabled approach for generating data processors capable of handling a multitude of data operations, including numerous data conversion and processing activities. The proposed approach emphasizes end-user, direct manipulation-based definition of data processors and automated code generation of their associated code, thus freeing the scientists from specialized and often tedious programming tasks. This, in turn, translates into an increased efficiency of the scientific research work. Details of the proposed approach and its supporting web-based software tool are presented in this paper, together with an application example in which an input dataset in the CSV format is converted into an output dataset in the XML format. The applicability of the proposed approach goes beyond the domain of environmental sciences, for which it was initially created, as it can be used in many other areas of research that emphasize data-intensive exploration and processing.
    Information Technology: New Generations (ITNG), 2013 Tenth International Conference on; 01/2013
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    ABSTRACT: In order to simulate scientific models in various conditions climate change research involves using large sets of heterogeneous data. In many cases, for model interoperability a dataset from a given model or source needs to be transformed into a different data format required by a subsequent model or processor. This paper presents the SUNPRISM approach and software tools aimed at supporting collaborative scientific exploration via new capabilities for combining data transformations, model simulations, and output visualizations in application scenarios developed for climate change research. The SUNPRISM framework's defining characteristics are a visual object-based interface for scenario configuration, a workflow-based environment that allows code generation and dataflow scenario execution, and data visualization capabilities for 3D environments, including for immersive virtual environments such as CAVE. The paper describes the proposed approach and its supporting tools, the SUNPRISM Scenario Manager and the SUNPRISM Visualizer, and illustrates them on an application scenario in which data from the National Digital Forecast Database is retrieved and visualized in 3D. A brief comparison with related work and an outline of directions for future work are also included in the paper.
    Collaboration Technologies and Systems (CTS), 2012 International Conference on; 01/2012
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    ABSTRACT: Modern mathematical models for simulation of various systems are becoming increasingly complex and intricate. Since no one model can simulate every aspect of a system, the need for these models to be broken into their component parts is imperative for accuracy and maintainability. However, no model can operate alone without data from an outside source, and so further efforts in the Model Interoperability area of research are necessary. Model Interoperability is dedicated to finding methods with which to couple two or more models. This coupling would allow the models to utilize each other 鈂s data to produce more comprehensive and more accurate results. There are several methods for model interoperability, including monolithic, component, scheduled, and communication. Also, there are solutions to the problem of model coupling that use one or more of those methods, but most of them require significant code modification. The goal of the software framework proposed in this paper is to minimize the need for code modification and creation, provide a user interface through which to couple the models, and establish a library of models and other activities that the users of the system can utilize for their own model coupling needs.
    01/2011;
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    ABSTRACT: Model interoperability, also known as model coupling, is involved in a significant part of scientific research and offers an interesting and worthwhile area of exploration and development for related supporting software frameworks and environments. This paper presents the challenges of scientific model coupling, with emphasis on climate change research, and briefly describes the current main methods for dealing with model interoperability. The paper also proposes a design solution for a new intelligent software tool aimed at facilitating model coupling and improving research productivity in climate change research. The main components of the proposed tool are presented and the tool's major modes of operation are described. An outline of planned future work on the proposed software environment for enhanced model interoperability is also included in the paper.
    World Automation Congress (WAC), 2010; 10/2010
  • Proceedings of the 16th International Conference on Distributed Multimedia Systems, DMS 2010, October 14-16, 2010, Hyatt Lodge at McDonald's Campus, Oak Brook, Illinois, USA; 01/2010
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    ABSTRACT: This paper describes a simulation environment for training naval officers and presents details of one of its main functions, planning a secure trajectory through moving targets. For this function we applied the well-known A* search to determine the shortest possible path from our current position to the destination without entering the hazardous zone of the targets. We approximate the circular shapes of radar surveillance areas as N-vertex polygons, which significantly reduces computational complexity by limiting the number of possible waypoints. The experiments conducted show that our method can find the optimal solution sufficiently fast such that it can be applied in real-time situations where target platforms continuously change their direction of movement and/or speed.
    Electro/Information Technology, 2007 IEEE International Conference on; 06/2007
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    S. Okamoto, S. Dascalu, D. Egbert
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    ABSTRACT: Using web applications has become a common solution to access and manipulate information remotely. Platform and device independency can be achieved most efficiently using matured web standards. By combining available standards and web technology, complex interactive web applications can be created. However, building even basic web applications is limited to expert software developers. Even though end-users have a desire to create one, the hurdle to learn and combine multiple technologies altogether is often too high for their needs and skills. In this paper we present WIDE, a new software application designed to assists end-users develop web applications visually and thus minimize their efforts.
    Automation Congress, 2006. WAC '06. World; 08/2006
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    ABSTRACT: Software project management tools have become essential for effectively managing software development efforts. Project managers need straightforward yet effective progress and status reports based on metrics for themselves and stakeholders - reports intuitively produced without resorting to a 200-page manual. This paper introduces CrownVision, a new type of project management software system which facilitates project development insight and supports more responsive and effective project development control. This web-enabled innovative system generates visual representations and utilizes evaluative and predictive techniques to accomplish these objectives. The UML- based software model of CrownVision is presented in the paper, together with several examples of use. Planned enhancements and directions of further work are also described.
    21st International Conference on Computers and Their Applications, CATA-2006, Seattle, Washington, USA, March 23-25, 2006, Proceedings; 01/2006
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    ABSTRACT: To address some of the challenges related to data interoperability in scientific modeling and simulation we propose a web-enabled software application (software toolkit) that dynamically generates data processing tools (data processors) capable of performing conversions and other operations on data based on user-defined specifications and customizations. The proposed application is designed to store all new user-created data structures and mappings for reuse and sharing purposes. It is also designed to generate reusable source code and executable binary files for easy and straightforward use by the scientists, thus saving them a substantial amount of data processing time. This paper presents the software architecture of the proposed web-enabled toolkit, provides details of the toolkit's modes of operation and web user interface, and outlines directions of future work.
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    ABSTRACT: Command and control systems have gained an increasingly vital role when it comes to displaying information about operational situations. In such situations, pictures have traditionally been presented on 2D media, rather than 3D displays. CAVEMANDER is a software platform that we created to improve the visualization and immersion of presenting command and control situations inside the CAVE. This paper describes a proposed GUI wizard used to develop command and control applications in CAVE based on the software architecture of CAVEMANDER. The wizard supports designing and creating command and control simulation scenes and scenarios. Details of the wizard's interface and functionality as well as a case study of a simulation scenario are provided in the paper.