• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.227-229
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• 1999

이동로봇에 통신 기술을 결합하여 응용하려는 시도는 Tele-Robotics라는 학문의 한 분야로 이미 국내외적으로 정착되고 있다. 초기에 Tele-Robotics.Tele-Operation 기술은 극한작업을 위해서만 사용되었으나, 최근에는 일상생활과 밀접한 다양한 분야로 그 응용분야를 넓혀가고 있다. 본 논문에서는 대화식 무선통신 기능을 가진 이동로봇을 제작하고 그와 통신할 수 있는 호스트 시스템을 구성하여 이동 로봇의 원격 제어, 원거리에서의 지형 탐색, 데이터 수집 기능 등을 구현함으로써 본격적인 원격 탐색 시스템 구축을 위한 기초 연구를 수행하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10c
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• pp.319-321
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• 2000

네트워크와 휴대 무선 장비의 발달로 데스크 탑 PC에서만 사용할 수 있었던 각종 인터넷 서비스들이 무선 단말기를 지원하고, 확장되기 시작했다. 이에 따라 휴대 단말기에서 웹에 접근하기 위한 응용 프로토콜인 WAP의 표준화가 빠르게 확산되고 WML을 지원하는 WAP 브라우저를 탑재한 인터넷폰의 개발이 다양하게 이루어지고 있다. 본 논문에서는 이러한 휴대 무선 장비와 PC간에 메시지를 전달하는 기법을 설계하고 인터넷상에서 폭발적인 이용률을 보이는 인스턴트 메신저에 이 기법을 적용하여 휴대 무선 장비에서도 인스턴트 메신저를 사용할 수 있는 시스템을 구현한다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2002.12a
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• pp.207-210
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• 2002

진화와 학습 사이의 상호 연관성을 연구하기 위해 인공 진화기법(artificial evolutionary algorithm)과 신경회로망(neural networks)을 이용한 학습 기법들이 사용되어 왔다. 신경 회로망 구조를 가지는 이동 로봇의 제어기의 구조와 파라미터를 결정하기 위한 방법으로 진화적 학습(evolutionary learning) 방법이 제안되었다. 제안된 방법에서 진화적 학습은 실제 로봇을 통해 on-line 방식으로 이루어지며, 장애물 회피 문제를 통해 유용성을 검증하고 진화 과정에 학습이 미치는 영향을 살펴보았다. 그리고 수학적으로 제시되기 힘든 진화 학습의 평가에 설계자의 개입을 허용하는 인터액티브 진화 알고리즘(interactive evolutionary algorithm)방법을 모색해 보았다.

• Journal of KIISE:Computer Systems and Theory
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• v.28 no.9
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• pp.415-423
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• 2001

Recently, there are many attempts to reproduce real world fine art pieces in digital forms. The digital representations are convenient to store and/or transmit. In contrast, mobiles, or moving sculptures, such as those designed by Alexander Calder cannot to reproduced realistically by usual reproduction techniques. Since mobiles are originally designed to generate motions in response to external forces applied to it, people could not fully enjoy them through photographs or static images. We present a virtual mobile system where use can easily control the mobile and can feel the impressions that the artist originally intended to provide. A real-world mobile is reconstructed in a three-dimensional physically-based model. and then virtual wind is generated to give motions to it. The motions of the mobile are generated by constraint dynamics and impulse dynamics techniques, which are modified to fully utilize the characteristics of the mobile, and finally give interactive displays on the PC platforms. The techniques presented can easily be extended to simulate other interactive dynamics systems.

• Journal of the Korea Convergence Society
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• v.11 no.12
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• pp.31-37
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• 2020

The rapid development of the mobile internet has gradually changed the carrier of electronic games from PC to mobile. mobile games have become an excellent choice for many people to spend their spare time and enjoy life. Among many types of mobile games, Number of users of FPS games has increased rapidly in recent years. Based on the 《Emotional Design》 proposed by Donald Norman, this article compares the interaction design of China's most popular FPS game 《Game for peace》 and Korea's most popular FPS game 《PUBG》, and analyzes their similarities and differences, and then use that as a basis to summarize the three levels of emotional design-Visceral level, Behavior level, and Reflection level, which is the user interface, interaction mode, and interaction experience in interaction design Emotional expression on the two games. This theory provides suggestions for interactive design in the information industry such as mobile games.

• Journal of Korea Multimedia Society
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• v.18 no.4
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• pp.499-505
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• 2015

Security supports are a significant factor in the design of mobile ad hoc networks. In the dynamic topology where the node changes frequently, private key generation and revocation for newly joining and leaving nodes must be considered. In addition, the identities of individual nodes must be protected as well in mobile networks to avoid personal privacy concerns. This paper proposes ID-based private key revocation scheme and non-interactive key agreement scheme in anonymous MANETs. The proposed scheme provides the user privacy using pseudonyms and private key generation and revocation schemes with consideration of dynamic user changes. Therefore, our schemes can be applied in dynamic and privacy-preserving MANETs which are helpful to share multimedia data.

• ETRI Journal
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• v.30 no.1
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• pp.101-112
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• 2008

In this paper, we present a method to customize the ground color in outdoor sports video to provide TV viewers with a better viewing experience or subjective satisfaction. This issue, related to content personalization, is becoming critical with the advent of mobile TV and interactive TV. In outdoor sports video, such as soccer video, it is sometimes observed that the ground color is not satisfactory to viewers. In this work, the proposed algorithm is focused on customizing the ground color to deliver a better viewing experience for viewers. The algorithm comprises three modules: ground detection, shot classification, and ground color customization. We customize the ground color by considering the difference between ground colors from both input video and the target ground patch. Experimental results show that the proposed scheme offers useful tools to provide a more comfortable viewing experience and that it is amenable to real-time performance, even in a software-based implementation.

• International Journal of Internet, Broadcasting and Communication
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• v.12 no.3
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• pp.39-45
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• 2020

The fifth generation (5G) mobile communication has been more commercialized worldwide. One of the promising 5G technologies is non-orthogonal multiple access (NOMA). We present the achievable sum rate of non-orthogonal multiple access (NOMA) with correlated superposition coding (SC). Then this paper investigates the impacts of correlation on the achievable sum rate of correlated SC NOMA. It is shown that the achievable sum rate of correlated SC NOMA is greater than that of standard independent SC NOMA, for the most of the values of the power allocation factor over the meaningful range of the user fairness. In result, correlated SC could be a promising scheme for NOMA.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.11a
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• pp.144-147
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• 2003

It is important to understand the process of technology diffusion among end users for effectively implementing adoption and coping with frequent changes in the environment. Previous studies indicate that information and communication technology (ICT) adoption is affected by innovation influence such as usefulness, ease of use and self-efficacy. Most of these studies, however, bypassed imitation influence such as subjective norms, word-of-mouth, and advertising, specifically, interactive innovation having critical mass in technology acceptance research. Thus, this study investigates imitation influence in individual adoption of mobile communication technology, more specifically, mobile phones, using Mahaian's diffusion model in individual ICT adoption.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.20 no.2
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• pp.207-213
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• 2011

In this paper, we present a study on the real-time implementation of mobile robot to which the interactive voice recognition technique is applied. The speech command utters the sentential connected word and asserted through the wireless remote control system. We implement an automatic distance speech command recognition system for voice-enabled services interactively. We construct a baseline automatic speech command recognition system, where acoustic models are trained from speech utterances spoken by a microphone. In order to improve the performance of the baseline automatic speech recognition system, the acoustic models are adapted to adjust the spectral characteristics of speech according to different microphones and the environmental mismatches between cross talking and distance speech. We illustrate the performance of the developed speech recognition system by experiments. As a result, it is illustrated that the average rates of proposed speech recognition system shows about 95% above.