• Journal of Digital Contents Society
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• v.8 no.2
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• pp.245-253
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• 2007

Recently, the use and application of computer graphics in the mobile and ubiquitous environment are growing. Real-time rendering and modeling for computer graphics are due to system performance, there're lots of limitation in lower system such as PDA and cell phone etc. Therefore, we suggested the intelligent Serving Rendering Middleware which is to provide adaptation service of computer graphics contents fit to user's environment real-time whatever environment the users are in. The Service Rendering Middleware needs multi-level configurations and applications, so, in this paper we propose multi-level algorithm to decide adaptation levels are deal with separately according to device performance.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.6
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• pp.243-248
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• 2013

With rapid growth and fast diffusion of smartphone technologies, many users are deeply concerned about the smart applications and many mobile applications converged with various related technologies are rapidly disseminated. Especially, the convergence technologies like mobile apps that can establish the wireless ad hoc network between smartphone and other peripherals and exchange data are appear and progressed continuously. In this paper, we design and implement the smart app using bluetooth based wireless ad hoc sensor network that can connect smartphone with sensors and exchange data for various smart applications. The proposed smart application in this paper collects data obtained from more than 2 multi-sensors in real time and fulfills the decision making function by storing data at the database and analysing it. The smart application designed and implemented in this paper is the healthcare application that can analyze and evaluate the patient's health condition with sensing data from multi-sensors in real time through bluetooth module.

• Journal of the Korea Society of Computer and Information
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• v.17 no.2
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• pp.177-185
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• 2012

In this paper, we developed the composition system that it can efficiently edit camera recording data, images, office document such as powerpoint data, MS word data etc in real-time and broadcasting system that the file is made by the composition system. In this Study, we developed two kinds of algorithm; Approximate Composition for Optimization (ACFO) and Sequence Composition using Memory Que (SCUMQ). Especially, the system is inexpensive and useful because the system is based on mobile devices and PCs when lectures hope to make video institutional contents. Therefore, it can be contributed for e-learning and m-learning. In addition, the system can be applied to various fields, different kinds of multimedia creation, remote conferencing, and e-commerce.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.212-215
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• 2009

옷감 시뮬레이션은 지금까지 게임, 애니메이션, 영화 등에 많이 사용되어왔고, 현재 증강현실(Augmented Reality) 환경에서의 교육자료, 쇼핑몰 뿐만 아니라 휴대용 게임기, 휴대폰 등 모바일 기기에서도 그 응용이 점점 증가하는 추세다. PC에 비해 그래픽스 하드웨어의 성능이 떨어지는 기기에서 3차원 시뮬레이션을 가능하게 하기 위해서는 모델의 움직임을 최대한 근사(Approximation)하면서 계산 속도를 보장하는 방법이 필요하다. 즉, 상호작용(Interaction)이 필요한 사용자 입장에서는 최소한의 정확성만 보장한다면 실시간 시뮬레이션이 더 큰 이슈가 된다. 따라서 이 논문에서는 증강현실 환경에서 실시간 시뮬레이션을 보장하는 옷감 시뮬레이션 방법을 제안한다. 안정성과 정확성이 보장되는 적분법(Integration)을 사용하였고, 옷감의 길이가 비사실적으로 늘어나지 않게 하기 위해 제약 조건(Constraints)을 주었다. 또한 각 지점에서의 곡률(Curvature)을 고려하여 충돌 검사를 함으로써 옷감 내부 충돌 검사로 요구되는 많은 계산량을 효율적으로 처리하였다.

• The Journal of the Korea Contents Association
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• v.10 no.3
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• pp.1-9
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• 2010

In this paper, we propose a new method of improving accuracy of motion estimation in mobile environments, compared with Rosten's algorithm. The present method selects corners as feature points. The Rosten's algorithm uses simple addition and subtraction to detect the corners. Although it has the advantage of faster processing speed, Rosten's algorithm has a drawback of low performance in motion estimation. We use the NCC(Normalized Cross Correlation) coefficients to match the corners, and remove in two steps the outliers of inaccurate matching corners. We compare the proposed algorithm with Rosten's algorithm by applying both to the real images. We find that the proposed method shows better performance than Rosten's algorithm in motion estimation. In addition, we implement the present method on mobile devices and confirm that it works in mobile environments in real time.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06d
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• pp.100-102
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• 2006

본 논문에서는 분산응용 개발 및 관리에 대한 사용자의 요구사항을 만족시킬 수 있는 분산서비스 맞춤형 소프트웨어 아키텍쳐인 분산객체그룹 프레임워크를 제안한다. 분산객체그룹은 응용을 구성하는 분산객체들을 하나의 논리적인 그룹으로 관리하며, 분산객체그룹 프레임워크는 분산응용의 개발자 관점에서 응용의 범위를 효율적으로 정의할 수 있을 뿐 아니라, 프레임워크의 지원 분산서비스를 응용과 독립적으로 적용할 수 있다. 프레임워크의 컴포넌트로 그룹관리자와 보안모듈, 모바일프락시, 컨텍스트제공자 및 DPD-Tool을 포함하며, 실시간 서비스를 위한 실시간관리자, 스케쥴러를 갖는다. 본 프레임워크는 분산서비스 지원 컴포넌트들의 상호작용으로 적응성(adaptability), 확장성(scalability), 보안성(security), 이동성(mobility) 및 신뢰성(reliability)을 제공하며, 분산응용을 개발 시 필요한 분산서비스를 모듈 단위로 선택하여 실제 응용 수행 시 선택한 분산서비스를 통해 그 수행성이 보장되도록 한다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2006.06a
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• pp.307-312
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• 2006

최근 무선인터넷에 대한 수요가 증가함에따라 기존의 이동통신망과 무선랜뿐만아니라 다양한 무선 인터넷 망들이 속속등장하고 있다. 현재 대표적인 IP 이동프로토콜로는 Mobile IPv6를 들 수 있다. 이러한 Mobile IPv6 방법은 실시간 성이 요구되거나 패킷 손실에 민감한 응용에서는 기존의 Mobile IPv4 보다는 많은 기술적인 향상이 이루어 졌다. 본 논문에서는 Mobile IPv6에서 모바일 노드의 이동에 따른 지연이 발생하게 되는데, 이러한 지연을 최소화하기 위해 Mobile IPv6 Draft에서 제시한 여러 가지 기술적인 부분들에 대한 성능을 분석하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2010.07a
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• pp.233-234
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• 2010

본 논문에서는 스마트폰 기반의 차량 원격제어 시스템을 제안한다. 스마트폰에는 G센서가 탑재되어 모션을 제어하는데 사용되고 있으며, G센서는 X, Y, Z축으로 되어 있어 여러 방향과 속도의 동작들을 제어할 수 있으며, G센서는 Wi-Fi통신과 블루투스 모듈의 RS232통신 방식을 이용하여 여러 분야의 모바일 단말기에 응용 할 수 있다. 본 연구에서는 모바일 단말기에서 G센서 장착된 휴대용 단말기 iPhone을 사용하여 영상으로 차량원격제어시스템을 구현 및 개발하여 운전자들이 휴대용 단말기에서 실시간 영상으로 좀 더 편하게 차량을 원격제어, 관리할 수 있는 어플리케이션을 제안한다.

• Journal of KIISE:Software and Applications
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• v.33 no.4
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• pp.388-401
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• 2006

A tool for analyzing and testing software in real-time is required for the efficient development of highly reliable real-time mobile embedded software This too] requires various technologies, such as source code based white-box test and real-time system monitoring and control. The tool also should be designed to improve reusability and portability by considering the interaction with other kinds of real-time system. This paper identifies and analyzes the functional requirements for the test tool on real-time mobile embedded software and suggests an adequate tool architecture based on the collected requirements. It also suggests the specific implementation technology and architecture design pattern to support the tool's expandability and portability.

• Journal of the Korea Society of Computer and Information
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• v.24 no.11
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• pp.29-39
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• 2019

As mobile robot applications increase in real life, the need of low cost autonomous driving are gradually increasing. We propose a novel vision-based real-time lane detection and tracking system that supports autonomous driving of mobile robots in constrained tracks which are designed considering indoor driving conditions of mobile robots. Considering the processing of lanes with various shapes and the pre-adjustment of operation parameters, the system structure with multi-operation modes are designed. In parameter tuning mode, thresholds of the color filter is dynamically adjusted based on the geometric property of the lane thickness. And in the unstable input mode of curved tracks and the stable input mode of straight tracks, lane feature pixels are adaptively extracted based on the geometric and temporal characteristics of the lanes and the lane model is fitted using the least-squared method. The track centerline is calculated using lane models and the motion model is simplified and tracked by a linear Kalman filter. In the driving experiments, it was confirmed that even in low-performance robot configurations, real-time processing produces the accurate autonomous driving in the constrained track.