Publications

Geospatial Spreadsheets with Microscale Air Quality Visualization and Synchronization for Supporting Multiple-Scenario Visual Collaboration

Because of abundant contexts at Earth’s surface, the collaborative role of GIScience and collaboration systems have become more important in many areas such as urban planning and environmental management for geo-collaboration. However, one of the major conundrums of interdisciplinary communication work in GIScience is that each expert insists his or her profession and the collaboration system have no mediator function (such as compromise) ...

 

Three-Dimensional Point Cloud Based Sky View Factor Analysis in Complex Urban Settings

Quantitatively describing effects caused by trees is a challenging issue for sky view factor (SVF) studies. The complex geometrical shapes of trees and the seasonally changing canopy volume caused by leaf growth and defoliation have forced SVF users to disregard trees in their analysis or to apply a simple geometric object, such as a rectangular pole or vertically elongated ellipsoid. The three-dimensional point cloud (3DPC) method is useful for quantitative analysis of urban settings by describing the structured spatial complex in detail, not only by shape itself but also with many meaningful indices such as SVF. We here proposed a new SVF analysis method based on 3DPC. Stereoscopic projection was applied ...

 

Visual Simulation of Vortex Particle using Adaptive Grid in High Vorticity Region

We propose the method that improves visual reality of turbulence phenomenon by finding high vorticity region and adding detailed vorticity confinement force in PIC/FLIP simulation. We basically use the coarse grid in simulation, and we find the region where the flow of change is substantial and substitute detailed sub-grid for the coarse grid of that region. Adaptive grid made this way can be used to simulate the turbulence of differing scale effectively. Moreover, we show ...


Development of Airborne LiDAR Based Sky View Factors to Estimate Micro-scale Energy Budget of Forest Areas: a Case Study of Taehwa Forest

About 6% of earth incoming solar radiation energy (nearly 173 petawatts) is absorbed by the ground surface, which fuels earth surface energy budget and physical/biological/ecological cycles including biogenic emission processes. Many key factors and indices have been proposed to understand the phenomenon ...

FluX - A Software Platform for Large-Scale Fluid Simulation

This article suggests a software platform for large-scale fluid simulation. FluX is designed based on Node-Graph architecture to make a new effect easily by compounding nodes, and it is very simple to develop a new algorithm by combining existig node and newly-added node. In addition, FluX supports network distributed computing based on MPI(Message Passing Interface), developer can simply implement the parallel algorithm using the API of FluX without the knowledge of parallel operation.

Implementation and performance improvement of EKF-SLAM and TJTF-SLAM with logs of sensor data set taken from real robots

Simultaneous localization and mapping (SLAM) is a technique used by robots and autonomous vehicles to build up a map within an unknown environment (without a priori knowledge), or to update a map within a known environment (with a priori knowledge from a given map) ...

Fractal analysis method applied to the analysis of EEG time series for a distinction between patients with Alzheimer-type dementia and late life depression

There are some meaningful results in a study of neurophysiological properties of depression and Alzheimer dementia with EEG, but so far, it is in a state that conflicting results are mixed. There is a limit to analyze the EEG signal ...