• The KIPS Transactions:PartB
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• v.15B no.3
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• pp.219-228
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• 2008

For real-time social networking service, mobile interaction in a usable-unified-ubiquitous (U3) web service was studied. Both as a convenient mobile HCI for real-time social networks and as indexing keys to metadata information in ubiquitous web service, the multi-lingual single-character domain names (e.g. 김.net, 이.net, 가.net, ㄱ.net, ㄴ.net, ㅎ.net, ㅏ.net, ㅔ.net, ㄱ.com, ㅎ.com) are convenient mobile interfaces when searching for social information and registering information. We introduce the sketched design goals and experience of mobile interaction in Korea, Japan and China, with the implementation of real-time social networking service as an example of U3 Web service. We also introduce the possibility of extending the application to the metadata directory service in IP-USN (IP-based Ubiquitous Sensor Network) for a unified information management in the service of social networking and sensor networking.

• Journal of the HCI Society of Korea
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• v.13 no.3
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• pp.5-15
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• 2018

The biggest characteristic of Social Network Game(SNG) is that games are played through competition and cooperation with the actual acquaintances based on SNS. Even though such competition and challenge spirit have been dealt importantly as preceding factors having influence on the flow in games in the existing game area, it is rare to find researches deeply considering the characteristics of ranking competition between acquaintances in SNG. Moreover, it was not considered that such acquaintances could be the targets of competition and also challenge at the same time in SNG. Therefore, this study examined the achievements(big differences in ranking, small differences in ranking) of the targets for comparison and closeness(strong ties, weak ties) with the targets for comparison as factors having influence on competition and challenge spirit, and also empirically analyzed the influence of such factors and interactions between factors on players' competition and challenge spirit in the ranking competitive society, by analyzing the characteristics of ranking competition between acquaintances in the mobile puzzle, SNG based on SNS through the analysis on the preceding research on the self-evaluation maintenance model of the social comparison theory. In the results, when preferentially exposing competitors with small difference in ranking and also exposing competitors with stronger ties, players' competition is stimulated, so that it can improve their challenge spirit. Such results of this study can be expected to a lot contribute to the actual design work of SNG ranking table contents.

• Journal of the HCI Society of Korea
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• v.2 no.2
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• pp.45-51
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• 2007

Space planning is one of the popular applications of VR technology including interior design, architecture design, and factory layout. In order to provide easier methods to accommodate physical objects into virtual space planning task, we suggest applying mixed reality (MR) interface. We describe our hardware and software of our MR system designed according to requirements of the application domain. In brief, our system hardware consists of a video see-through display with a touch screen interface, mounted on a mobile platform, and we use screen space 3D manipulations to arrange virtual objects within the MR scene. Investigating the interface with our prototype implementation, we are convinced that our system will help users to design spaces in more easy and effective way.

• Journal of the HCI Society of Korea
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• v.4 no.2
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• pp.9-16
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• 2009

3D stereo display systems gain more interests recently. Multiple-view autostereoscopic display system enables observers to watch stereo image from multiple viewpoints not wearing specific devices such as shutter glasses or HMD. Therefore, the Multiple-view autostereoscopic display is being spotlighted in the field of virtual reality, mobile, 3D TV and so on. However, one of the critical disadvantages of the system is that observer can enjoy the system only in a small designated area where the system is designed to work properly. This research provides an effective way of GPU based rendering technique to present seamless 3D stereo experiences from an arbitrary observer's view position.

• 한국HCI학회:학술대회논문집
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• 2008.02b
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• pp.185-192
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• 2008

지난 몇 년간 HCI 분야에서 사용자 경험 (User Experience)이라는 용어는 전통적 의미의 사용성부터 심미적, 유희적, 감성적 그리고 기술 사용을 포함하는 사용의 전반적인 경험을 일컫게 되었다. 기술 성숙과 더불어 제품의 빈번한 상호작용으로 인해, 사용자는 제품의 도구적 의미의 유용성과 사용성에 대한 기대 충족 뿐만 아니라, 심미성, 감성 등 사용자의 내재적 가치까지 만족시켜주길 원한다. 본 연구는 사용자의 실용적인 목적 뿐만 아니라, 내재적 가치까지도 고려한 전체 사용자 경험 연구를 위해, 제품의 '도구적 요구 관점' 과 '비도구적 요구 관점' 을 함께 고려하고자 한다. 비인간 대상을 사람으로 간주하는 의인화 (Anthropomorphism) 연구에서는 대상을 도구적임과 동시에 비도구적으로 대하려는 현상을 보여준다. 이런 의인화 연구들을 착안하여, 본 연구는 의인화의 의의와 도출 과정을 살펴보고 HCI 분야에서 왜 의인화 관점의 연구가 중요한지, 사용자들은 언제 어떻게 사용하는 제품을 의인화하려는지 다른 분야의 의인화와 비교 설명하려 한다. [연구 1]에서는 2 개국 (독일, 인도) 에서 4 개의 디지털 기기 (핸드폰, MP3 플레이어, TV, 냉장고) 사용자를 대상으로 Contextual Interview 를 실시 후, 분석하여 국가별 디지털 기기 별 주요 의인화 요소들을 도출하였다. [연구 2]에서는 의인화 관점의 분석 결과가 문화적 차이에 따라 어떤 영향을 받는지를 검증하기 위해 [연구 1]의 통일 2 개국에 문화적 성향 측정을 위한 설문을 실시하였다. [연구 1]과 [연구 2]의 결과를 통해 HCI 분야에서의 의인화 관점 연구의 의의와 프레임웍을 설명하고, 문화적 차이를 반영한 제품의 의인화 가이드라인을 제시하고자 한다.

• International Journal of Contents
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• v.15 no.1
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• pp.1-9
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• 2019

Since the VR market is expected to have a high growth, this study aimed to investigate the human factor-related determinants of user satisfaction with mobile VR headsets. A pre-study of customer reviews was conducted with the help of semantic network analysis to identify the core keywords for understanding negative and positive predictors of mobile VR headset experiences. Through laboratory testing with three different commercial models, the main study measured and identified the predictors of user satisfaction. From the results, five factors were extracted as valid predictor variables and used for regression analysis. These factors were immersion, VR sickness, usability, wear-ability and menu navigation interface. All the five predictors were proved to be significant determinants of the perceived user satisfaction with mobile VR headsets. Usability was the strongest predictor, followed by VR sickness and wear-ability. Practical and theoretical implications of the results were discussed.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10d
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• pp.223-225
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• 2002

MEMS 가속도센서 기술의 발전은 가속도센서를 이용한 사용자 인터페이스 구현에 대한 연구를 촉진시키고 있다. 본 논문에서는 가속도센서를 기반으로 한 휴대폰 단말기를 사용하여, HCI 관점에서 센싱 기술을 소개한다. 이러한 기술은 센서 신호로부터 컴퓨터의 변위량을 계산함으로써 Knock & Mute 와 Tilt & Scroll와 같은 인터페이스를 구현할 수 있다.

• Journal of the HCI Society of Korea
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• v.1 no.1
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• pp.81-88
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• 2006

With the introduction of the digital technology in the exhibition environment, the information of the exhibit has come to be transmitted through diverse media. The visitors desire has been increased from the simple viewing of the exhibition to the active participation in the exhibition viewing and the utilization of the exhibit information. Subsequently, the study on the service to effectively support the viewing experience and provide the information by utilizing the internet and mobile device for visitors in movement has become important in terms of the exhibition environment. Accordingly, in this study, the current condition in studying the service supporting the exhibition environment and the exhibition viewing, which are being changed into a digital network environment, was examined through the literature and case studies. In order to find out the viewing situation and viewing type of visitors, the visitors behaviors of viewing the exhibition were observed. By analyzing the contents observed, the viewing type and keyword were drawn in accordance with the visitors behaviors of viewing. On the basis of this, visitors needs and problems occurring in case of the exhibition viewing were found out via in-depth interview. The service factors of supporting the exhibition viewing were proposed on the basis of the factors by which visitors needs and problems could be solved via interface in the circumstance when visitors would move round the exhibition hall and view the exhibition. In terms of the service factors, the method to resolve was presented on the basis of the relationship between the exhibit and the space in case of selecting and viewing the exhibit. This was applied into the mobile PDA with the example of the exhibition environment in the national museum. Through the scenario of using, the usefulness of the service proposed and the relevant possibility of utilization were reviewed.

• Journal of KIISE:Computing Practices and Letters
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• v.16 no.8
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• pp.883-887
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• 2010

3D face tracking is one of essential techniques in computer vision such as surveillance, HCI (Human-Computer Interface), Entertainment and etc. However, 3D face tracking demands high computational cost. It is a serious obstacle to applying 3D face tracking to mobile devices which usually have low computing capacity. In this paper, to reduce computational cost of 3D tracking and extend 3D face tracking to mobile devices, an efficient particle filtering method using MLESAC(Maximum Likelihood Estimation SAmple Consensus) motion estimation is proposed. Finally, its speed and performance are evaluated experimentally.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.1341-1347
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• 2006

기존의 모바일 게임의 경우에는 간단한 스토리를 갖는 2D 게임이 주종을 이루었다. 그러나 이 논문에서는 PC 에서만 가능하다고 여겨지던 3D 경영 시뮬레이션 게임을 모바일에 접목해 보고자 하였다. 시공간의 제약이 없으며 간편성과 이동성을 가진 모바일 게임의 장점을 살리며 3D 게임의 현실감, 시뮬레이션 게임의 재미를 모두 가질 수 있는 게임을 제작하고자 하였다. 게임의 기본적인 줄거리에는 고구려의 역사적 사건을 넣어서 게임을 하면서 고구려의 역사를 직접 느껴보도록 하였다. 세금의 단위나 정책에 관한 내용은 고구려의 실제 역사적 내용을 따랐으며 게임의 중간 중간에 시행되는 고구려의 정책 결정 과정을 통하여 고구려 왕의 생각과 흐름을 느끼도록 하였다. 게이머는 왕을 보조하는 입장에서 고구려의 정책을 간언할 수 있으며 왕의 정책을 지지할 수도, 반대할 수도 있다. 시간의 변화에 따라 왕도 변화하며 왕족의 계도도 고구려의 수순을 따르며, 왕의 역사적인 주요 정책도 게임을 통하여 자연스럽게 적용된다. 이로써 단순한 도시 경영이 주 테마가 아닌 고구려의 역사적 배경을 자연스럽게 삽입한 게임을 제작함으로써 게임의 사실성을 높였으며 한국적인 그래픽과 음악을 삽입하여 통적인 감각을 살렸다. 전본 논문에서는 3D 경영 시뮬레이션 게임 [한고을]의 전체적인 구성과 본 게임의 알고리즘을 소개하고 있다. 본 게임 개발의 가장 큰 목적은 모바일 기반의 3D게임 개발을 통한 사실적인 게임을 제작하고 탄탄한 스토리를 가진 게임 제작이다. 그러나 역사적인 내용을 사용함으로써 부가적으로 교육적인 효과도 있었다. 이 게임개발을 계기로 하여 급속하게 성장하고 있는 모바일 컨텐츠 시장에서도 컨텐츠의 수가 아닌 질적인 증가가 이루어 졌으면 하는 바램을 가진다.