• The Journal of the Korea institute of electronic communication sciences
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• v.14 no.1
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• pp.205-212
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• 2019

With the rapid spread of mobile phones, users are continuously interested in using the mobile phone in connection with personal activities. Also, increasingly users want to share (transmit and receive) and save data more easily and simply in the mobile environment. This paper suggests motion recognition of mobile phone to share personal information with any people located within a certain distance using location-based service with GCM service. The suggested application is based on Google Cloud Messaging which enables asynchronous communication with the mobile applications executed in Android operating system. The requirements of light-weight mechanism can be satisfied as it is possible to access sharing of personal information easily, simply and in real time through all mobile devices anywhere.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.286-287
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• 2018

As the number of single-person households is increasing in Korea, the demand for emergency support networks for the elderly and women is also growing. To meet the need, systemic solutions, such as a wide distribution of cell phones with embedded motion sensors that can alert the first responders or police in case of health or safety crisis, are regarded as critical issues. This paper introduces a design which registers the user's motions to process emergency reports via a mobile app running in the background. The method offers an affordable solution to reporting emergencies taking place both indoors and outdoors as it does not require an addition of hardware but only simple hand gestures.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.05a
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• pp.236-238
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• 2022

VR/AR(가상현실/증강현실) 디바이스 기술 진보가 가속화되고 관련 시장이 확대되면서 메타버스 플랫폼이 최근 많은 주목을 받고 있다. 하지만 새로운 플랫폼 개발에도 불구하고 사용자를 인증하는 방식은 기존의 PC와 모바일 플랫폼의 인증방식을 따라가고 있다. 본 논문에서 우리는 메타버스에서 기존 PC/모바일 인증 방식을 그대로 적용했을 때 발생할 수 있는 문제점을 제기하고, 모션캡처를 이용하여 사용자의 모션을 입력 받아 메타버스플랫폼에서 활용할 수 있는 사용자 인증방식을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.05a
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• pp.599-601
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• 2019

본 논문에서는 움직이는 객체 탐지 및 배경 분리 기술을 응용하여 영상 흔들림 보정 기술과 접목하고, 모바일 디바이스에 사용될 수 있는 방법을 설명한다. 또한 이미지에서 사람을 인식하는 기술을 이용하여 모바일에 추가적으로 활용할 수 있는 방법을 소개한다.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.378-383
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• 2009

In these days, many systems are equipped with people to infer their intention and provide the corresponding service. People always carry their own mobile device with various sensors, and the accelerator takes a role in this environment. The accelerator collects motion information, which is useful for the development of gesture-based user interfaces. Generally, it needs to develop an effective method for the mobile environment that supports relatively less computational capability since huge computation is required to recognize time-series patterns such as gestures. In this paper, we propose a 2-stage motion recognizer composed of low-level and high-level motions based on the motion library. The low-level motion recognizer uses the dynamic time warping with 3D acceleration data, and the high-level motion is defined linguistically with the low-level motions.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.1028-1030
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• 2017

최근 스마트 기기에 대한 관심이 지속적으로 증가함에 따라 다양한 스마트 기기가 출시되고 그에 대한 연구가 활발히 진행되고 있다. 기존 스마트 기기에 탑재된 모션 센서에 관한 연구 대부분은 사용자의 움직임을 이용한 게임 연구에 치우쳐 있다. 본 논문은 사용자 모션의 시각화라는 접근을 통해 사용자의 모션을 직관적으로 볼 수 있도록 하였다. 안드로이드 기반 모바일 기기에 탑재되어 있는 모션 센서 중 방향 센서를 이용하여 사용자 모션에 대한 데이터를 수집하고 이를 시각화 알고리즘을 통해 시각화 한다. 시각화한 결과를 손 글씨 숫자 이미지의 대형 데이터베이스 기반 머신러닝을 활용하여 분석하고 사용자의 모션을 인식할 수 있다는 결과를 확인했다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.8
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• pp.703-710
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• 2016

In robotics research, accurate estimation of current robot position is important to achieve motion control of a robot. In this research, we focus on a sensor fusion method to provide improved position estimation for a wheeled mobile robot, considering two different sensor measurements. In this case, we fuse camera-based vision and encode-based odometry data using Kalman filter techniques to improve the position estimation of the robot. An external camera-based vision system provides global position coordinates (x, y) for the mobile robot in an indoor environment. An internal encoder-based odometry provides linear and angular velocities of the robot. We then use the position data estimated by the Kalman filter as inputs to the motion controller, which significantly improves performance of the motion controller. Finally, we experimentally verify the performance of the proposed sensor fused position estimation and motion controller using an actual mobile robot system. In our experiments, we also compare the Kalman filter-based sensor fused estimation with two different single sensor-based estimations (vision-based and odometry-based).

• Journal of Korea Game Society
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• v.15 no.1
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• pp.89-100
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• 2015

This study aims to figure out the impact of cross-promotion strategy on flow experience to overcome the restrictions of social network game. Social network games faces tougher market competition and shorter product life-cycles. The results show that the less users play games, the more they feel flow experience led by interests and self-expression of SNG. On the contrary, the more they play games, self- expression and sense of competition factor are proved to be effective factor for flow. Also Users' cognition for usefulness and annoyingness of cross- promotion are different according to level of game uses and promotion uses. People who play games more and utilize promotion more appreciate the usefulness of promotion and indulge in flow experience of SNG.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.06a
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• pp.109-111
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• 2014

본 논문에서는 비접촉 동작 인식 기기를 활용한 동영상 콘텐츠 검색 시스템을 소개한다. 제안하는 시스템은 스마트 TV와 같은 인터넷이 가능한 디스플레이의 동영상 콘텐츠를 대상으로 하며, 콘텐츠 자체 또는 콘텐츠 내의 객체에 대한 정보를 검색 결과로 제공한다. 시스템 구현에 앞서 영상 콘텐츠의 검색 요구 사항에 따라 시나리오 및 기능을 수립하고, 각각의 기능은 비접촉 동작 인식 기기인 립모션을 기반으로 손 동작을 지정하였다. 따라서, 제안하는 시스템은 사용자의 손가락 동작에 의해 선택된 영역을 모바일 비주얼 검색 서버에 전송하게 되고, 검색 결과는 모바일 기기를 통해 최종적으로 전달된다. 본 논문에서는 시스템을 실제로 구현하고 다양한 콘텐츠에 대하여 실험하였다. 개발된 시스템을 통해서 사용자는 손을 이용한 간단한 동작에 의해 콘텐츠 정보, 콘텐츠 내 객체의 정보를 실시간으로 모바일을 통해 제공받을 수 있다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.800-801
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• 2017

Location-based services (LBS) are used in various applications such as emergency support, navigation, location, traffic routes, information gathering, and entertainment due to the rapid growth of information communication technologies and mobile phones. In general, locations are represented by coordinates and are related to terrain. These are of great interest in mobile-based data transmission. This paper proposes a method to exchange the contact of the other party by detecting the movement of the mobile phone of the individual user based on the location-based service. The proposed method extracts motion using the acceleration sensor of the mobile phone and transmits the location and time information to the server when the motion continues for a predetermined time. Attempts to establish a connection between users who are experiencing motion in mobile phones in the short distance have been made from the server. Once the connection between the users is made, the encrypted contact is received from the server. Experimental results show that the proposed method can exchange data by minimizing the processing in the handset compared with the existing method.