• Journal of Korea Multimedia Society
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• v.13 no.8
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• pp.1221-1234
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• 2010

MANET(Mobile Ad-hoc Network)s have been researched primary at routing protocols and at the guarantees of QoS(Quality of Service) for mobile environments. Otherwise the Ubiquitous Sensor Networks (USNs) have some limitations in power energies and in processing of sensing data, as well as their network topologies are frequently changed by fading off and node failures. Thus we should redesign network protocols with concerning to energy efficiency for the USNs above all. In this paper, we focus on the protocol interface for managing for USNs based on the surveys. And then we figure the topology of USNs out and design the network protocol interface to make power saved, with data gathering and processing more efficient using our designed packet structures.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.39 no.4
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• pp.180-187
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• 2002

Many real-time multimedia applications, such as video conferencing have stringent end-to-end delay constraints and consume large amount of network resources. In order to support these applications efficiently, multicast routing algorithms computing least cost multicast trees that satisfy a given end-to-end delay constraint are needed. However, finding such a tree is known to be computationally expensive. Therefore, we propose a heuristic distributed multicast routing algorithm that reduces a “finding multicast tree”that satisfies a given end-to-end delay constraint and minimizes the average resulting tree cost. Also, simulation results show that the proposed algorithm has much better average cost performance than other existing algorithms.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.7
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• pp.1614-1620
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• 2009

The overlay multicast that has been recently presented as an alternative for the IP multicast has been getting much persuasion by the system resource and the network bandwidth and the advancement of the network cost. we propose a overlay multi_casting network policy for efficient multimedia services with P2P join scheduling. In order to evaluate the performance of proposed scheme, We test the performance of multi_casting nodes with average join count, the maximum guaranteed waiting time and buffer starvation ratio with similar techniques. The result of simulation shows improved about 15${\sim}$20% of performance.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.01a
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• pp.193-194
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• 2018

미디어 서비스는 사용자들의 다양한 미디어 소비 패턴 변화와 상호작용 서비스, 고화질 고용량의 다양한 소비자들 요구로 인해 새로운 미디어 서비스 패러다임을 맞이하고 있다. 이에 따라, IT 자원의 효율적인 사용 및 유지 관리비용의 절감을 목적으로 클라우드 컴퓨팅을 기반으로 한 클라우드 미디어 서비스의 연구가 활발히 이루어지고 있다. 하지만, 기존 클라우드 기반 미디어 서비스의 경우 저작권 보호 기술이 제한적이며, 사용자 및 서비스 제공자에게 유연한 저작권 보호 기술이 필요하게 되었다. 본 논문에서는 클라우드 기반 미디어 서비스를 위한 저작권 보호 플랫폼에 대한 참조 모델을 제시하여 멀티 DRM을 지원하는 클라우드 기반 미디어 서비스를 구축할 때 실제 시스템 구현에 참조할 수 있는 모델을 제시한다.

• The KIPS Transactions:PartA
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• v.10A no.5
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• pp.487-492
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• 2003

To satisfy the requirements for QoS of Users using multimedia content stream service, it is required to control mechanism for QoS based on class priority, URFA classifies the user by two classes (super class, base class) and controls the admission ratio of user's requests by user's class information. URFA increases the admission ratio class and utilization ratio of stream server resources.

• The KIPS Transactions:PartD
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• v.15D no.3
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• pp.411-420
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• 2008

This paper implemented the u-Healthcare Context Information System (HCIS) supporting ubiquitous healthcare by using location, health and titrating environment information collected from sensors/devices equipped in home for healthcare home service. The HCIS is based on the Distributed Object Group Framework (DOGF), a management model which can customize distributed resources, and manages various context information, applications and devices as a group in healthcare home environment, as one more logical units. Also, this system provides continuous healthcare multimedia service considering a resident's location using Mobile Proxy, and the healthcare context information through Context Provider to a resident in home. For verifying execution of our system, we implemented the seamless multimedia service based on resident's location and the prescription/advice and schedule notification/alarm service as healthcare applications in home. And we showed the executing results of healthcare home service by using service device existed in the residential space on which the resident is located according to the healthcare scenario.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.8
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• pp.19-24
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• 2018

The IP Multimedia Subsystem(IMS) is an architectural framework for delivering IP multimedia services to mobile users. In order to guarantee the reliability and Quality of Service(QoS) of a variety of multimedia services, we need a new evolutionary approach that maintains the IMS based signaling platform which can perform the processing of flow through distributed controllers. Software Defined Network(SDN) is an architecture purporting to be distributed, dynamic, cost-effectives as well as adapting and seeking to be suitable for the high-bandwidth, dynamic nature of today's applications. It requires some methods for the control plane to communication with the data plane. One of such mechanisms is OpenFlow which is a prominent standard protocol and interface that is responsible for managing the network resources by using the remote SDN controller. In this paper, we propose a straightforward approach for integrating SDN technology together with the IMS architecture. Therefore we propose and construct a combined architecture model that performs flow processing using OpenFlow via the IMS based signaling platform, which maintains the existing telecom call service. Additionally, we describe some relevant experimentation results from the proposed architecture.

• Journal of Korea Multimedia Society
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• v.9 no.1
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• pp.101-108
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• 2006

Developing a network game that is serviced on the internet requires a lot of work, time and manpower. Therefore, it is important to design a game in such a way so that existing design codes could be used. The database for the multi-player network game is accessed from many clients. To manage the resource effectively, it is required to design the APIs to be minimized the database access and to be dealt with the related data efficiently. For this, it is needed to apply the object-oriented design for the related software modules. In the paper, we propose the design patterns of GoF to implement the APIs thatis needed to deal with the database resource. The database design through the analysis of some game's GUI has the advantage to create the optimized schema set more quickly, because it minimize the review step and the modification step of the database design generally. In addition, we apply to the design patterns of GoF for the APIs design of the server-side database. These reduce the times of the program call between the game server and the database server. These also make easily the maintenance for the already developed APIs, and it makes easily the addition of new APIs.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.18 no.2
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• pp.211-219
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• 2000

In the 21th century, on the level of the limit of national resources, the national land development, the development using the marine resource and the marine space, the international diplomacy and the national security, the island development will be more vitalized. Therefore, considering the various kinds of information becomes diverse and massive quantitatively, it is necessary that we develop an effective system which not only operates the information, but also gives a function of various display using the computer graphic and the multimedia. On this point of view, this study focused on thesuggestion of the application system model which is necessary for an efficient management, analysis and development of our country's island. That is, unlike the previous information system, the IIMS(Island Information Management System) model was developed by the active use of the Geo-Spatial Information System which improves the efficiency of the work by managing the spatial information and the attribute information simultaneously, and objectively induces the decision of the opinion and the policy for the management and the development of the island.

• Annual Conference of KIPS
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• 2007.11a
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• pp.605-608
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• 2007

사회의 변화는 교육의 패러다임 및 교육 인프라에 많은 영향을 미치고 있다. 변화하는 사회에 발맞춰 교육인적자원부는 90년대 중반부터 교육정보화 종합 추진 계획 3단계 사업을 진행하고 있다. 그로 인해 교원 1인당 1PC, 컴퓨터실 및 다양한 멀티미디어실 구축, 교단선진화 기자재 보급이 계속 되어왔다. 또한 미래의 교육 비전으로 u-러닝을 제시함으로써 2011년까지 중등학교에 u-러닝 인프라 구축 및 단말 보급을 계획하고 있어 고가의 교육 기자재는 지속적으로 증가할 것으로 보인다. 그러나 현재 학교에서는 교육 기자재 관리가 단순히 보유현황 파악에만 머물고 있어 고가의 기자재 도난 위험, 신속하게 처리되어야하는 요지보수 문제, 노후 기자재 교체 및 폐기에 대비하고 있지 못하다. 이런 문제점을 해결하기 위해 본 연구에서는 기자재 관리에 RFID와 USN을 활용함으로써 기자재를 효율적으로 관리하고 교육에 적극 활용할 수 있도록 한다.