• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.10
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• pp.2330-2336
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• 2013

Since many man-made systems consist of autonomous and interactive components, it is intrinsically difficult to analyze their abnormal behavior. The logical analysis of such a system is an indispensable process for high quality and reliable system development. In this paper, we propose an analysis method using two algebraic operations, named composition and minimization. Repetitive composition and minimization of component models with respect to a set of important events produces a new analysis model that has the same input output responses to an environment. An analysis example of the alternating bit protocol demonstrates the effectiveness of the proposed method showing that each message generated at the sender side eventually arrives to a receiver.

• Korean Management Science Review
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• v.25 no.1
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• pp.123-138
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• 2008

Recently, DMB service markets experience a rapid change with terrestrial DMB test-broadcasting for the nation-wide coverage and paid interactive data broadcasting being offered utilizing TPEG and BIFS technologies. This warrants a reexamination of a consumers' adoption intentions for DMB service. This paper uses a survey data set to analyze DMB adoption intentions and the choice between terrestrial DMB and satellite DMB services according to preferred contents and other media usage characteristics. Empirical results show that consumer who prefer TV, music, and movie contents are more likely to adopt DMB service, whereas consumers with high intentions for HSDPA subscription are less likely to adopt DMB service. This implies that continuing development of killer application and the analysis of substitutes or complements of other media are crucial for the increase of DMB adoption intentions. It is found that the more consumers prefer sports, movies and entertainment/game and put higher values in the quality of the contents, the more likely they adopt satellite DMB service. Meanwhile, the more consumers prefer TV, drama and news contents, and are sensitive to the subscription fees, they are more likely to adopt terrestrial DMB service. Therefore, it seem that consumers' DMB adoption between terrestrial and satellite services is crucially related with types and characteristics of contents offered.

• Journal of Korea Multimedia Society
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• v.13 no.9
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• pp.1382-1390
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• 2010

We can see interactions between rigid body and fluid every day, anywhere. This kind of rigid body-fluid simulation is one of the most difficult problems in physically-based modeling, mainly due to heavy computations. In this paper, we present a real-time dynamics model for simulating stone skipping, which is a popular rigid body-fluid interaction in the real world. In comparison to the previous works, our improved dynamics model supports the rotation of the stones and also computes frictional forces with respect to the air. We can simulate a realistic result for various user input by using proposed model. Additionally, we present a water surface model to show more realistic ripples interactively. Our methods can be easily adapted to other interactive dynamics systems including 3D game engines.

• Journal of Korea Multimedia Society
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• v.10 no.7
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• pp.934-943
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• 2007

This paper presents a real-time fire simulation on the mobile phone using stable fluid animation techniques. Stable and fast fluid simulation methods are developed in PC and console games, but fluid simulation and interactive fluid models require too much system resources for applying on mobile environment. We studied and implemented physics-based models for fluids like fire and smoke effects using billboard and stable fluids simulation method on mobile 3D system. The mobile platform of our system is WIPI, which is the standard mobile platform in Korea, also we adopted NF3D API for our 3D programming API. We implemented real-time fire simulation and added it in mobile 3D game, "Rupee Story".

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.5
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• pp.65-71
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• 2011

Face warping techniques have been used for correcting image distortion as well as for creative purposes(e.g., morphing). Smartphone can capture an image from camera and transfer it through network. Thus, warping software which is implemented on the smartphone may be widely used in the fields of game and plastic surgery. This paper describes the design of face warping software using transformation with multiple pairs of lines and bilinear interpolation, and then shows the implementation results on the smartphone. Through many people review, this software showed real-time responsiveness and good transformation quality.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10b
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• pp.164-168
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• 2006

최근 컴퓨터 게임에 등장하는 NPC(Non-player Character)에 각종 인공지능 기법을 적용하는 연구들이 이루어지고 있다. 하지만 대부분의 연구가 플레이어를 상대하는 적대적 입장의NPC들의 움직임 조절에 초점을 맞추고 있고 아직까지 게임 상에서 등장하는 모든 NPC는 항상 같은 말과 비슷한 행동을 되풀이하는 모습만을 보여주고 있다. 이는 플레이어가 게임을 비현실적으로 느끼게 만들고 결과적으로 게임의 재미를 저하시키는 요소로 작용한다. 플레이어에게 보다 현실적인 게임 환경을 제공하기 위해서는NPC가 단순히 게임의 배경을 구성하는 오브젝트가 아니라 다양한 대화를 통해 플레이어에게 많은 영향을 주게 하여 게임의 기여도를 높여주어야 한다. 본 논문에서는 이를 위해 게임 속에서 주어지는 퀘스트를 구성하는 NPC, 몬스터, 보상 등의 속성 정보를 온톨로지화 하고, 인터넷에 존재하는 게임 커뮤니티에서 퀘스트 질의/응답 게시판의 글을 추출하여, 플레이어의 관련 질의에 응답하는 NPC를 구현하고자 한다. 이를 위해 온톨로지 정보를 이용한 검색 알고리즘을 구현하였고,시뮬레이션을 통해 NPC가 커뮤니티 게시글 정보를 이용하여 유저에게 고정되지 않은 다양한 메시지를 전달하면서 동시에 유저의 게임 진행을 도와주는 모습을 확인하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.2
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• pp.982-1004
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• 2017

The recent advances in the field of augmented reality (AR) have shown that the technology is a fundamental part of modern immersive interactive systems for the achievement of user engagement and a dynamic user experience. This survey paper presents the descriptions of a variety of the new AR explorations, and the issues that are relevant to the contemporary development of the fundamental technologies and applications are discussed. Most of the literature regarding the pertinent topics-taxonomy, the core tracking and sensing technologies, the hardware and software platforms, and the domain-specific applications-are then chronologically surveyed, and in varying detail, this is supplemented with the cited papers. This paper portrays the diversity of the research regarding the AR field together with an overview of the benefits and the limitations of the competing and complementary technologies.

• Proceedings of the Korean Society of Computer Information Conference
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• 2014.01a
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• pp.67-70
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• 2014

본 논문에서는 아두이노를 이용하고 SMS와 PHP를 기반으로 구축된 인터렉티브 종이비행기 게임시스템을 설계하고 구현한다. 본 시스템은 LCD가 설치된 건물과 센서가 부착되어 물체가 들어오면 인식할 수 있는 각기 독립된 4개의 방, 게임 사용자의 문자 메시지를 읽고 출력하는 용도의 프린트와 개인서버로 이루어진다. 설계단계는 PHP를 이용한 웹 서버를 통해 사용자가 보낸 문자 메시지를 읽어 오는 첫 번째 단계, 사용자가 보낸 문자메시지의 내용을 프린트를 통해 출력하는 단계, 출력된 내용의 프린트물이 비행기로 접혀 센서가 부착된 각기 다른 4개의 방으로 들어갔을 때 프린트에 적힌 문자메시지의 내용이 LCD에 출력되는 단계로 이루어진다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.11
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• pp.7508-7512
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• 2015

We propose a brain-machine interface(BMI) based human-robot interaction(HRI) platform which operates machines by interfacing intentions by capturing brain waves. Platform consists of capture, processing/mapping, and action parts. A noninvasive brain wave sensor, PC, and robot-avatar/LED/motor are selected as capture, processing/mapping, and action part(s), respectively. Various investigations to ensure the relations between intentions and brainwave sensing have been explored. Case studies-an interactive game, on-off controls of LED(s), and motor control(s) are presented to show the design and implementation process of new BMI based HRI platform.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2003.11a
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• pp.267-270
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• 2003

본 논문은 DVB-MHP 규약을 따르는 동기화 된 데이터 방송 애플리케이션을 제작하기 위한 스트림 생성기의 구현을 기술한다. 동기화 된 애플리케이션은 비디오와 공유된 시간기준을 가지며 특정시각에 발생한 이벤트(스케쥴드 스트림 이벤트)를 처리할 수 있는 애플리케이션이다. 동기화 된 애플리케이션을 위해서 스트림 생성기는 다음 작업을 수행한다. (1) NPT(Normal Play Time)를 수신기로 보내기 위해 NPT 참조서술자를 전송 스트림 내에 MPEG2 섹션으로 포장하여 넣는다. (2) 스케쥴드 스트림 이벤트들을 생성하여 전송 스트림내의 적당한 위치에 MPEG2 섹션으로 포장하여 넣는다. (3) 애플리케이션 프로그램과 스트림 이벤트에 대한 참조(reference)를 포함하는 객체 카로셀을 생성한다. DVB-J 애플리케이션은 DVB-MHP API중에 섹션필터 관련 API를 이용하여 전송된 NPT 참조 서술자를 읽어들이고 이로부터 NPT를 재구성하며, 스트림 이벤트 관련 API를 이용하여 스트림 이벤트를 처리하도록 구현한다 스트림 생성기가 생성한 MPEG2 전송 스트림으로 Interactive Game Show 애플리케이션을 제작하여 비디오와 애플리케이션이 사용하는 이미지 디스플레이간의 동기화를 테스트하였다.