• Spatial Information Research
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• v.18 no.1
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• pp.27-37
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• 2010

As a pilot project of the National Spatial Data Infrastructure, "Quality upgrade of continuous cadastral map and Conversion of land use zoning map" is performed last year. In this study, for the following main project, its result is analyzed and problems occurred on the way carried out are extracted. The area change before and after conversion is compared, and relationship with the continuous cadastral map is analysed on the data of Ansung-Si. And than, systematic improvement method is suggested based on that problem.

• The Journal of Korea Robotics Society
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• v.13 no.2
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• pp.79-85
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• 2018

This study focuses on autonomous exploration based on map expansion for an underwater robot equipped with acoustic sonars. Map expansion is applicable to large-area mapping, but it may affect localization accuracy. Thus, as the key contribution of this paper, we propose a method for underwater autonomous exploration wherein the robot determines the trade-off between map expansion ratio and position accuracy, selects which of the two has higher priority, and then moves to a mission step. An occupancy grid map is synthesized by utilizing the measurements of an acoustic range sonar that determines the probability of occupancy. This information is then used to determine a path to the frontier, which becomes the new search point. During area searching and map building, the robot revisits artificial landmarks to improve its position accuracy as based on imaging sonar-based recognition and EKF-SLAM if the position accuracy is above the predetermined threshold. Additionally, real-time experiments were conducted by using an underwater robot, yShark, to validate the proposed method, and the analysis of the results is discussed herein.

• Journal of Environmental Science International
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• v.24 no.6
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• pp.807-817
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• 2015

In this study the urban atmospheric environment map in Busan was made and it consist of the atmospheric environment element map and the atmospheric environment analysis map. The atmospheric environment element map covered the topography, the urban climate, the air pollutant emission, ozone and PM10 concentrations in Busan and the atmospheric environment analysis map included the thermal environment and the wind flow by using WRF meteorological numerical simulation. The meteorological elements from 2007 to 2011 in Busan were used in this study. As a result, in the center of Busan and Buk-gu along to the Nakdong river was the temperature high. To analyze the air flow of Busan 3 clusters depending on the wind direction were extracted with the cluster analysis. The results of the analysis on the detailed wind field of each cluster showed that the weak ventilation could be happened locally at the specific meteorological condition.

• Journal of Korean Academy of Nursing Administration
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• v.21 no.5
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• pp.511-518
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• 2015

Purpose: The purpose of this research was to develop and evaluate the effect of a mind map for relief of emotional labor and burnout among nurses in outpatient departments in cancer hospitals. Methods: We developed a mind map to reduce emotional labor and burnout. A quasi-experimental study was used with a nonequivalent control group pretest-posttest design. Data were collected from December 2012 to April 2013. Participants were 35 nurses working in the outpatient department of a cancer hospital. The experimental group participated in the mind map program biweekly for 10 weeks. Data were analyzed using $x^2$-test, Mann-Whitney U test, paired t-test, and Wilcoxon sign rank test with the SPSS 21.0 program. Results: The physical burnout and total burnout scores decreased significantly in the intervention group which took the mind map program. Conclusion: Findings indicate that the mind map is an effective intervention to reduce burnout in outpatient department nurses.

• Journal of Institute of Control, Robotics and Systems
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• v.18 no.3
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• pp.243-250
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• 2012

This paper proposes a 3D map-building algorithm using one LRF (Laser Range Finder) while a mobile robot is navigating on the slanted surface. There are several researches on 3D map buildings using the LRF. However most of them are performing the map building only on the flat surface. While a mobile robot is moving on the slanted surface, the view angle of LRF is dynamically changing, which makes it very difficult to build the 3D map using encoder data. To cope with this dynamic change of the view angle in build 3D map, IMU and balance filters are fused to correct the unstable encoder data in this research. Through the real navigation experiments, it is verified that the fusion of multiple sensors are properly performed to correct the slope angle of the slanted surface. The effectiveness of the balance filter are also checked through the hill climbing navigations.

• Journal of the Korean association of regional geographers
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• v.8 no.1
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• pp.110-121
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• 2002

The aim of this study is to develop multimedia courseware which can make studying picture map interesting in a more concrete and three-dimensional situation by using multimedia materials such as graphics, animation, and moving images, which breaks from the past teaching methods for picture map. The multimedia courseware used in this research can help learners understand the concept on picture map in a much easier way, and study wherever and whenever they want to. In addition, students can pass through the levels up according to their levels through the process of students' constructing the knowledge by themselves and individualized materials which can enhance their desire to learn and make the individualized learning possible.

• Journal of KIISE:Computing Practices and Letters
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• v.15 no.8
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• pp.586-590
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• 2009

The objective of this paper describes the design of MapReduce over Peer-to-Peer network for dynamic environments applications. MapReduce is a software framework used for Cloud Computing which processing large data sets in a highly-parallel way. Based on the Peer-to-Peer network character which node failures will happen anytime, we focus on using a DHT routing protocol which named Pastry to handle the problem of node failures. Our results are very promising and indicate that the framework could have a wide application in P2P network systems while maintaining good computational efficiency and scalability. We believe that, P2P networks and parallel computing emerge as very hot research and development topics in industry and academia for many years to come.

• Journal of Institute of Control, Robotics and Systems
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• v.11 no.2
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• pp.137-143
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• 2005

Autonomous mobile robot has an ability to navigate using both map in known environment and sensors for detecting obstacles in unknown environment. In general, autonomous mobile robot navigates by global path planning on the basis of already made map and local path planning on the basis of various kinds of sensors to avoid abrupt obstacles. This paper provides a global path planning method using self-organizing feature map which is a method among a number of neural network. The self-organizing feature map uses a randomized small valued initial weight vectors, selects the neuron whose weight vector best matches input as the winning neuron, and trains the weight vectors such that neurons within the activity bubble are move toward the input vector. On the other hand, the modified method in this research uses a predetermined initial weight vectors, gives the systematic input vector whose position best matches obstacles, and trains the weight vectors such that neurons within the activity bubble are move toward the input vector. According to simulation results one can conclude that the modified neural network is useful tool for the global path planning problem of a mobile robot.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.49 no.5
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• pp.310-314
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• 2000

To study the basic research of the lightning parameters for power system operation, LPATS(Lightning Positioning and Tracking System) has been introduced since 1995 in KEPCO(Korea Electric Power Corporation). We have developed the lightning parameters analysis program which can produce accumulative magnitude distribution of lightning current and IKL map by LPATS data. We obtained the various statistical distributions of lightning current parameters since 1996 by the lightning analysis program for the pertinent insulation design. In this paper, we describe the LPATS system in KEPCO, the statistical distribution of lightning current parameters and the IKL(Isokeraunic Level) map from 1996 to 1998. And the compared results between the calculated LFOR(lightning flashover rate) and the observed rate are also described.

• Journal of the Korean association of regional geographers
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• v.17 no.1
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• pp.40-57
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• 2011

A feng-shui map is a kind of map that features such propitious positions as fortune-bringing spots or ideal grave sites. The map is a representation of the most ideal natural terrains in terms of feng-shui perspectives. This study did research on two feng-shui maps registered on some genealogical tables in order to see how the map was drawn up. In addition, the detailed characteristics of landform expressions like the frame of the map, viewpoints, center-oriented mapping, water flow, mountain theories were delved into. The results of the research are as follows: the feng-shui maps for this research used the techniques of double scale and aerial view, described terrains with grave sites in their centers, and enlarged important terrains compared with surroundings for exaggeration purposes. In addition, other vital landforms not observed from grave sites were depicted with viewpoints moved and were represented in fine details. The part of mountain theories had the following points as their main subject matter: geographical locations, overall orientations of mountain ranges, topographical traits, grave seat directions and surrounding terrains.