• Journal of Korea Multimedia Society
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• v.24 no.2
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• pp.267-273
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• 2021

Recently, the small-size mobile robots with remote-control are rapidly growth which market of mobile is increased in the world. Especially, the smart-phones are widely used for interface device in the small size of a mobile robot. The research goal is control system design which is applied to miniaturization of a mobile robot using smart-phone and it can be confirmed performance for designed system. Meanwhile, the fabrication of mini-mobile robot can also be remote-control operation through the WIFI performance of a smart-phone. The smart-phone is used to remote-control for robot operation which control data transmit to robot via the WIFI network. To drive the robot, we can observe by the smart-phone screen and it can easily adjust the robot drive condition and direction by smart-phone button. Consequentially, there was no malfunction and images were printed out well. However, in drive, because of blind spot, robot was bumped into obstacle. Therefore, the additional test is necessary to sensor for blind spot which sensor can be equipment to mobile robot. In addition, the experiment with robot object recognition is needed.

• Journal of Korea Multimedia Society
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• v.7 no.2
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• pp.194-203
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• 2004

In this paper we propose a Mobile Petri-net Model (MPM) as a new specification model including the QoS parameter that minimizes the transmission delay time. In MPM, we propose a playing time algorithm for supporting the seamless presentation and the smooth playing. The proposed model has a higher guarantee of QoS such as playing time than the previous work.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11b
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• pp.568-570
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• 2005

정보통신기술이 급속히 발전하는 가운데 최근 RFID기술이 주목받고 있다. 이미 물류관리 분야에서는 실용화 되었고 다른 분야로의 응용연구도 계속되고 있다. 최근에는 RFID기술을 휴대폰에 융합한 모바일 RFID(Mobile RFID)라는 개념이 제안되었으며 그 실용화를 위한 연구가 활발히 진행되고 있다. 모바일 RFID기술은 통신기기와 센서기기의 통합형이라는 점에서 홈네트워크 시스템에 적용하기 좋은 기술이다. 따라서 본 논문에서는 모바일 RFID기술을 홈네트워크에 적용하여 홈네트워크 제어기로 활용하는 방안을 제안하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.204-206
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• 2016

모바일 디바이스와 어플리케이션의 발전으로 Mobile Cloud Computing(MCC)의 필요성이 대두되고 있다. MCC는 다수의 모바일 디바이스를 하나의 클라우드 환경으로 통합해 배터리 수명, 스토리지, 프로세싱 등의 성능 향상을 가져온다. 그러나 아직 MCC의 오프로드처리 방식이 명확히 정의되어 있지 않은 상황이다. 본 논문은 MCC 환경에서 모바일 디바이스의 작업을 클라우드에 이관해 처리하는 오프로드를 서버의 역할에 따라 다섯 가지로 나누어 정의해 제안한다. 마지막으로 더 효율적인 오프로드 방법을 제안하여 미래 연구 방향에 대해 논의한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.215-218
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• 2020

본 논문에서는 4차 산업혁명을 앞에 두고 베트남 기업들이 성장을 위하여 5G 모바일 커머스 연구를 진행한다. 최근 베트남 전자 상거래 시장은 유선 온라인과 모바일을 기반으로 빠르게 성장하고 있지만, 선진국의 전자상거래 모델보다는 아직도 문제점을 많이 가지고 있다. 우선은 파악된 베트남 전자상거래 모델의 단점을 극복한 다음에 5G 통신을 시작한다면 5G 커머스에 어떻게 적용 가능한지, 어떤 방향의 적용이 유리한지에 대하여 연구를 진행한다.

• Korea Multimedia Society
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• v.7 no.4
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• pp.1-14
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• 2003

• Journal of Information Technology Services
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• v.12 no.1
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• pp.271-287
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• 2013

The rapid growth and dissemination of touch-based mobile devices such as smart phones and tablet PCs, gives numerous benefits to people using a variety of multimedia contents. Due to its portability, it enables users to watch a soccer game, search video from YouTube, and sometimes tag on contents on the road. However, the limited screen size of mobile devices and touch-based character input methods based on this, are still major problems of searching and tagging multimedia contents. In this paper, we propose WalkieTagging, which provides a much more intuitive way than that of previous one. Just like any other previous video tagging services, WalkieTagging, as a voice-based annotation service, supports inserting detailed annotation data including start time, duration, tags, with little effort of users. To evaluate our methods, we developed the Android-based WalkieTagging application and performed user study via a two-week. Through our experiments by a total of 46 people, we observed that experiment participator think our system is more convenient and useful than that of touch-based one. Consequently, we found out that voice-based annotation methods can provide users with much convenience and satisfaction than that of touch-based methods in the mobile environments.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.6
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• pp.2992-2998
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• 2013

The future mobile communication system can support not only voice but also multimedia applications such as data, image and video. It requires greater resources than the voice-oriented mobile system. We propose user and sub-channel priority based resource allocation for mobile multimedia services in the OFDMA systems. Our method is able to guarantee QoS continuity of realtime services and carry the maximum number of non-realtime subscriber. Simulation is focused on total throughput and blocking rate. The simulation results show that our proposed method provides a better performance than the conventional method.

• Convergence Security Journal
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• v.8 no.2
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• pp.79-85
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• 2008

Our paper deals with a method for supporting multiple call/sessions in a mobile terminal. The different identifier for each protocol layer is assigned to each session when a mobile terminal sets SDP for multimedia services. In particular, QoS based tasks are used for managing the traffics in radio interface. Also, queuing, admission control, load control, resource allocation and scheduling are done based on the priority of sessions. The various multimedia services which is different in the requirement of resource allocation are able to be serviced simultaneously because a mobile terminal can provide the various services based on this scheme.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.109-112
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• 2005

As the degree of use of network is increasing the need for building the basic of the stable network service is being needed a lot. Also the engineers require the traffic control for the best application and management and bandwidth management urgently. To solve these problems, there were no other ways of increasing the bandwidth of lines until now. However, this solution has the limit that the cost is too high and the traffic problem is growing continuously. On this study, it is suggested that through the planning the wired /wireless combination network design offering the service of QoS, Multicast, Mobile, realtime multimedia traffic delay without packet loss will be dealth with.