• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 2부
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• pp.140-145
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• 2008

모바일 디바이스는 한정된 디스플레이 공간과 인터렉션의 제한적인 요소를 가지고 있다. 모바일 디바이스의 중요한 이슈 중 하나는 이러한 상황에서 어떻게 제조사의 Identity를 표현할 수 있느냐 하는 것이다. 그것은 사용자에게 일관성이라는 측면에서 매력적이기 때문이다. 그러므로 우리는 GUI, IA, AUI 요소에 해당하는 사용자 경험요소들로부터 추출하고 통합하는 작업들을 진행하였다. 이 연구는 각 부서의 실무담당자들이 모여 전사 TF로 진행되었다. 이 연구에서는 대상제품의 다양한 특성을 반영하면서 일관성을 유지하기 위해 여러 방법들과 프로세스들을 거치면서 시도되었다. 이러한 적용 가능한 결과들은 진행되는 본문에서와 같은 논의과정을 거쳐 얻어진 젓이다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 춘계학술대회
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• pp.649-651
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• 2014

DLNA(Digital Living Network Alliance) 표준은 홈 네트워크 내에서 멀티미디어 콘텐츠의 공유를 용이하게 한다. 하지만 스마트폰, 태블릿 PC와 같은 이동 컴퓨팅 기기의 사용이 빠르게 확산되면서 콘텐츠 공유는 홈 네트워크의 영역에서 확장될 필요성이 생겼다. 본 논문에서는 이동 환경에서도 사용자가 DLNA 기반 홈 네트워크와 연결하여 원하는 멀티미디어 콘텐츠의 공유를 가능하게 하는 방법을 제시한다. 제안되는 방법은 모바일 VPN(Virtual Private Network)의 사용을 기반으로 하며, 무선 환경에서 홈 네트워크의 자원에 쉽게 접근할 수 있는 방법을 제시한다.

• International Journal of Internet, Broadcasting and Communication
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• 제12권3호
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• pp.32-38
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• 2020

The deployment of geographically distributed wireless sensors has greatly elevated the capability of monitoring structural health in social-overhead capital (SOC) public infrastructures. This paper deals with the utilization of a distributed mobility management (DMM) approach for the deployment of wireless sensing devices in a structural health monitoring system (SHM). Then, a wireless sensing mechanism utilizing low-energy adaptive clustering hierarchy (LEACH)-based clustering algorithm for smart sensors has been analyzed to support the seamless data transmission of structural health information which is essentially important to guarantee public safety. The clustering of smart sensors will be able to provide real-time monitoring of structural health and a filtering algorithm to boost the transmission of critical information over heterogeneous wireless and mobile networks.

• 한국멀티미디어학회논문지
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• 제18권11호
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• pp.1383-1390
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• 2015

By according to the development of the mobile devices, a touch screen provides the variety of inputting character and the flexibility of user interface. Currently, the physically simple touch method is widely used for English input but this simple touch is not increasing the variety of inputs and flexibility of the user interfaces. In this paper, we propose a new method to input English characters continuously by recognizing gestures instead of the simple touches. The proposed method places the rotational pickers on the screen for changing the alphabetical sequence instead of the keys and inputs English characters through the flick gestures and the touches. Simulation results show that the proposed keypad method has better performance than the keypad of the conventional methods.

• 한국멀티미디어학회논문지
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• 제19권5호
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• pp.874-880
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• 2016

The gesture classification has been applied to many fields. But it is not efficient in the environment for game interface with low specification devices such as mobile and tablet, In this paper, we propose a effective way for realistic game interface using k-nearest neighbors algorithm for gesture classification. It is time consuming by realtime rendering process in game interface. To reduce the process time while preserving the accuracy, a reconstruction method to minimize error between training and test data sets is also proposed. The experimental results show that the proposed method is better than the conventional methods in both accuracy and time.

• 한국멀티미디어학회논문지
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• 제20권3호
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• pp.571-580
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• 2017

Recently, there are many communication softwares based on text on various smart devices. Unlike traditional print publishing, mobile publishing and SNS tools tends to utilize more decorative or more emotional fonts so that users can pass some feelings from contents. So font providers have released new fonts which deal with the requirements of the market. Nevertheless being released lots of new fonts, general users have not used them because they searched only by font name or font provider's name. It means that there is no way for users to know and find new things. In this study, we suggest font shape classification rules for font registration system based on font design features. We proved the validity of classification standard study through some experiments with 50 commercial fonts. Also the result of this study was provided for Korea Telecommunication Technology Association and adopted by the Korea industrial standard.

• 한국멀티미디어학회논문지
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• 제8권1호
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• pp.101-110
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• 2005

최근 들어 하드웨어 키보드가 제한적인 모바일 단말기에서 소프트웨어 키보드가 광범위하게 사용되고 있다 본 연구에서는 데이터베이스 분석을 통해 최적의 키보드 공간을 생성하여 최소의 입력 단계로 원하는 입력이 가능한 새로운 소프트웨어 키보드 입력 방법을 제시하였다. 제안된 소프트웨어 키보드는 입력 가능한 모든 단어를 분석하여 각각의 입력 단계에 따라 동적으로 생성된다. 이때 최소한의 키 버튼만을 도시함으로써 키 버튼 선택 영역을 최소화하고 키 입력 실수를 방지한다. 또한 입력 가능한 단어들의 수가 제한적일 때 후입력 자동 완성 기능을 제공함으로써 키 버튼 선택 횟수를 최소화할 수 있다.

• 한국멀티미디어학회논문지
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• 제23권1호
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• pp.58-66
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• 2020

5G-based HMD technology grew rapidly in the context of the environment change of convergence technology media and mobile networks in the fourth industrial era. It has also grown into a core technology that transforms our digital visual system. However, there is no research or system that can understand and verify radical visual system changes. Therefore, it is necessary to have an engineering understanding and verification of the diffusion of HMD media imaging devices. Beyond the distinction between virtual and real, research is urgently needed on the new three-dimensional interface of the 21st century through viewer participation. For this reason, research on the algorithm structure of interactive video media using L-System is an essential process and will be a guide to understanding the virtual reality interactive environment.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2007년도 학술대회 1부
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• pp.624-629
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• 2007

Digital Multimedia Broadcasting (DMB) is a digital radio transmission system for sending multimedia such as radio, TV, and data casting to mobile devices. Nowadays, DMB specifications are the major standard for digital broadcasting and have been establishing for bidirectional service using MPEG-4 system. But there has been only some simple demonstrated system for this bidirectional services. In this paper, we introduce bidirectional DMB data service system that provides the interaction between the user and DMB server without any additional equipment such as web server. The proposed bidirectional DMB system can capture and send user interaction information and response through the existing DMB transmission channel, finally update the original contents. The action event from the user is the most important thing in developing the bidirectional DMB system. Therefor, capturing the event data from the user is the first step we need to do for the bidirectional DMB service. In this paper, we propose an interaction manager module for the user events. This system will extract the user events and make a plan to update the original scene with the server's reaction information.

• 한국멀티미디어학회논문지
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• 제20권2호
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• pp.234-243
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• 2017

With the development of smartphone technologies enable photoplethysmogram (PPG) acquisition by camera and heart rate (HR) measurement. This papers presents improved algorithm to extract HR from PPG signal recorded by smartphone camera and to develop real-time PPG signal processing Android application. 400 video samples recorded by Samsung smartphone camera are imported as input data for further processing and evaluating algorithm on MATLAB. An optimized algorithm is developed and tested on Android platform with different kind of Samsung smartphones. To assess algorithm's performance, medical device Beurer BC08 is used as reference. According to related works, accuracy parameters includes 90% number of samples that has relative errors less than 5%, Person correlation (r) more than 0.9, and standard estimated error (SEE) less than 5 beats-per-minutes (bpm).