• Spatial Information Research
• /
• v.12 no.2
• /
• pp.137-149
• /
• 2004

For 3D modelling artificial objects with computers, we have to draw frames and paint the facet images on each side. In this paper, a geographic modelling system building automatically 3D geographic spaces using GIS data and real images of buildings is proposed. First, the 3D model of terrain is constructed by using TIN and DEM algorithms. The images of buildings are acquired with a camera and its position is estimated using vertical lines of the image and the GIS data. The height of the building is computed with the image and the position of the camera, which used for making up the frames of buildings. The 3D model of the building is obtained by detecting the facet iamges of the building and texture mapping them on the 3D frame. The proposed geographical modeling system is applied to real area and shows its effectiveness.

• Journal of Internet Computing and Services
• /
• v.16 no.4
• /
• pp.61-70
• /
• 2015

This paper presents a web-based Java applet for understanding the concepts in digital logic circuits and student satisfaction survey was carried out in order to show its educational validity. Through our educational Java applet, the learners will be capable of learning the concepts and principles related to digital logic circuit experiments and how to operate virtual experimental equipments and virtual bread board. The proposed educational Java applet is composed of five important components: Principle Classroom to explain the concepts and principles for digital logic circuit operations, Simulation Classroom to provide a web-based simulator to the learners, Virtual Experiment Classroom to provide interactive Java applet about the syllabus of off-line laboratory class, Assessment Classroom, and Management System. With the aid of the Management System every classroom is organically tied together collaborating to achieve maximum learning efficiency. Finally, we have obtained several affirmative effects such as high learning standard, reducing the total experimental hours and the damage rate for experimental equipments.

• Annual Conference of KIPS
• /
• 2019.05a
• /
• pp.493-495
• /
• 2019

제어 분야의 가장 기초적인 시스템인 Rotary Inverted Pendulum 을 제어하기 위하여, 본 논문에서는 강화학습에서 Deep Q-Network 과 함께 대표적인 알고리즘으로 알려진 Asynchronous Advantage Actor-Critic 을 활용하여 다중 디바이스 제어를 설계한다. Deep Q-Network 알고리즘을 활용한 기존 연구와 동일한 방식으로 실 세계의 물리 에이전트와 가상 환경을 맵핑시키며, 스위치를 통하여 로컬 에이전트와 글로벌 네트워크 간 통신을 구성한다. 본 논문에서는 분산 Asynchronous Advantage Actor-Critic 을 이용함으로써 실 세계의 다중 에이전트 제어를 위한 강화 학습의 활용 가능성을 조명한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 1999.10c
• /
• pp.575-577
• /
• 1999

액티브 네트워크는 사용자의 급변하는 다양한 요구에 대응할 수 있는 서비스 중심의 네트워크이다. 기존의 네트워크가 단순한 패킷 전달의 역할만을 담당했다면, 액티브 네트워크 사용자가, 제공되는 망의 서비스외에 필요한 다른 서비스를 구성, 설치함으로서 학문적 또는 상업적으로 좀 더 능동적으로 망을 사용할 수 있게 해준다. 이러한 액티브 네트워크에서 기존의 제공 서비스들(패킷 전달, 라우팅, 전자메일 등)과 함께, 사용자 혹은 망 관리자가 제공하는 서비스들이 공존하기 위해서는 망에 다양한 수행환경(Execution Environment)이 존재해야 한다. 본 논문에서는 액티브 네트워크상의 노드들에 위치하는 다양한 수행환경을 구성하고, 이를 관리하는 기법과 다중 수행환경을 이용한 다중 가상 네트워크에 대해, 현재 시도되고 있는 실 예들을 분석하여 보고, 효율적인 수행환경 구성을 위한 조건을 제시한다.

• Journal of Biomedical Engineering Research
• /
• v.21 no.6
• /
• pp.615-621
• /
• 2000

A social phobia is an anxiety disorder characterized by extreme fear and phobic avoidance of social and performance situations. Medications or cognitive-behavior methods have been mainly used in treating it. These methods have some shortcomings such as being inefficient and difficult to apply to treatment. Lately the virtual rcality technology has been applied to dcal with the anxiety disorders in order to compcnsate for these defects. A virtual environment provides a patient with stimuli which cvokes a phobia. and the patient's exposure to the virtual phobic situation make him be able to overcome it. In this study, we suggested the public speaking simulator based on a personal computer for the treatment of social phobia. The public speaking simulator was composed of a position sensor. head mount display and audio system. And a virtual environment for the treatment was suggested to be a seminar room where 8 avatars are sitting. The virtual environment includes a tracking system the trace a participant's head-movement using a HMD with position sensor and 3D sound is added to the virtual environment so that he might fcel it realistic. We also made avatars' motion and facial expression change in reaction to a participant's speech. The goal of developing public speaking simulator is to apply to treat fear of public speaking efficiently and economically. In a future study. we should get more information about immergence and treatment efficiency by clinical test and apply it to this simulator.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.27 no.2
• /
• pp.281-288
• /
• 2009

In the paper, we try to develop the methodology for updating road networks of large-scale digital maps by using construction drawing data. For the purpose, it is pre-requite step to merge road networks detached in CAD drawing data. As such, tie points are identified in neighboring drawings and used for solving the parameters of 2D conformal transformation between drawings. Then, the merged road network in CAD data is transformed to the coordinate system of digital maps. In the process, IPs in the drawings are considered as control information and 2D affine transformation is selected for coordinate transformation. Through the experiments with real dataset, we can identify that the developed method is valid and generally applicable.

• Information and Communications Magazine
• /
• v.32 no.7
• /
• pp.63-71
• /
• 2015

클라우드 컴퓨팅이란 공유된 IT 자원을 네트워크 상에서 가상화를 통하여 독립적으로 사용할 수 있는 개념으로 저탄소 녹색시대를 위한 에너지 절감 솔루션이다. 특히 비용 절감이 필수적인 기업과 공공기관 등에서 IT 자원의 개별적 소유에 시간과 비용을 투입하지 않고 사용한만큼의 비용을 지불할 수 있다. 이에 정부에서는 2015년 9월부터 시행되는 클라우드법 제정을 통하여 클라우드 컴퓨팅의 활성화를 적극 장려하고 있다. 그러나 신뢰성있는 서비스 제공을 위해서는 보안성, 성능, 안정성 제공을 위한 네트워크 기능의 한계 극복이 필수적이다. 이에 본 논문에서는 언제 어디서나 다양한 기기로 업무를 수행할 수 있는 모바일 스마트워크가 가능하도록 하는 단말과 기업망, 클라우드를 안전하게 연결하는 가상 사설 클라우드(Virtual Private Cloud) 네트워킹 구조를 제안한다. 본 구조에서는 클라우드 내에서 사설 주소의 중복 문제 해결을 위하여 위치 주소와 아이디 분리 프로토콜 기반 위에 기업망 등의 엔터프라이즈 ID 개념을 적용하여 주소 확장성을 제공하였다. 또한 이러한 기술을 적용한 VPC 매니저, 서비스 게이트웨이 및 에이전트로 구성된 VPC 네트워킹 솔루션으로 테스트베드를 구축하고 그 운용 경험을 통해서 실 사업자망에 적용 가능한 비즈니스 모델 도출이 가능할 것으로 기대한다.

• Journal of the Korea Computer Graphics Society
• /
• v.27 no.3
• /
• pp.31-42
• /
• 2021

We propose a deep learning-based method that can estimate an appropriate lighting of both indoor and outdoor images. The method consists of two networks: Crop-to-PanoLDR network and LDR-to-HDR network. The Crop-to-PanoLDR network predicts a low dynamic range (LDR) environment map from a single partially observed normal field of view image, and the LDR-to-HDR network transforms the predicted LDR image into a high dynamic range (HDR) environment map which includes the high intensity light information. The HDR environment map generated through this process is applied when rendering virtual objects in the given image. The direction of the estimated light along with ambient light illuminating the virtual object is examined to verify the effectiveness of the proposed method. For this, the results from our method are compared with those from the methods that consider either indoor images or outdoor images only. In addition, the effect of the loss function, which plays the role of classifying images into indoor or outdoor was tested and verified. Finally, a user test was conducted to compare the quality of the environment map created in this study with those created by existing research.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.12 no.1
• /
• pp.275-281
• /
• 2012

Community network is a communication environment where heterogeneous devices can access and communicate with each other at any time and at any space to share information. To do so, mobile devices are required to be self-configured even in absence of communication infrastructures. Semi-infrastructured wireless ad-hoc network is a promising solution to meet with such a requirement. This paper proposes the VTC(virtual topology coordinator) system as an evaluation tool for examining network protocols that are intended to be deployed in the semi-infrastructured ad-hoc networks. VTC emulates multi-hops wireless network topology virtually using a mechanism of selective receiving MAC frame in a small area, where only a single hop communication is available. VTC system cannot consider all properties introduced in real wireless network, but do more wireless properties than verification through simulation.

• Journal of Advanced Navigation Technology
• /
• v.17 no.2
• /
• pp.234-239
• /
• 2013

Learning a lesson about poor concentration and problems of the existing content, the system of language which could not be determined, Many teachers' assessment decision was made. As a result, voice recording based on the combination of ubiquitous technology and virtual reality technology, and install the projector in a classroom Through the learning content corresponding grade English student ID card attached RFID reader in each classroom, and students of RFID tags attached. In reality of the virtual three-dimensional image content foreigners and question-and-answer using the voice recording technology at the same time check the pronunciation and intonation level passes or level failure judged. Student education data to a central server system is configured to do so after saving to the DB through a feedback process, which provides information. Analysis of the issues that can have a common language content in the present study and Problem for voice recording technology to solve the problem and did not solve the existing language in the content level based classes.