• Journal of Korea Multimedia Society
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• v.20 no.8
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• pp.1357-1368
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• 2017

Sensor networks are used in various fields such as marine, defense, and smart home etc. Among the components of the sensor network, the sensor node collects sensor data, as one of the representative sensor network roles, and the sensor node makes a greate influence on the overall performance of the sensor network. Therefore, how to design the sensor node is an important issue in the sensor network field. However, the research on the sensor network architecture suitable for the sensor network installation environment has been made more important than the research on how to configure the sensor node. In this paper, we propose to identify elements to be considered for designing a sensor node that makes a large influence on the performance of the sensor network, and to easily implement the sensor node through the state transition model based on these elements.

• Journal of Korea Multimedia Society
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• v.19 no.11
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• pp.1871-1877
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• 2016

In this paper, a Wireless USB (WUSB) protocol is adopted for development of ASMD (Adaptive Source Multi Device) N-screen wireless services. WUSB is the USB technology merged with WiMedia PHY and Distributed-MAC (D-MAC). However, the current WUSB protocol can't provide seamless N-screen streaming services to moving WUSB devices in home network environment. Therefore, to provide the ASMD N-screen services through WUSB based on D-MAC protocol, a channel management scheme is proposed to support seamless mobility between adjacent ASMD groups for wireless IPTV N-screen services. In simulation results, proposed ASMD channel management (ACM) scheme is compared with conventional WUSB channel management scheme in view points of throughput, average path interference and energy consumption according to various numbers of nodes and elapsed simulation times. Through simulation results, it is explained that proposed ASMD channel management (ACM) scheme should be adopted in the WUSB protocol to realize ASMD N-screen wireless services.

• 한국정보통신설비학회:학술대회논문집
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• 2007.08a
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• pp.289-292
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• 2007

FTTH (Fiber to the Home) is constructed with optical devices and optical cables from central office (CO) to subscribers. With FTTH, it is possible to provide service platform in order to meet the customers' emerging demands for more bandwidth/security and diverse IP multimedia applications including high definition (HD) video streaming service. FTTH can provide enough bandwidth from 100Mbps to several Gbps per subscriber. It is also most appropriate network architecture for convergence of communication and broadcasting. So, FTTH is thought the final destination of telecom operators, since it is the fastest and most reliable solution so far and various IP multimedia services are possible through it. In this paper, newly attempted technologies of FTTH construction for apartment complexes using CWDM-PON system are discussed.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.11b
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• pp.802-805
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• 2002

홈네트워킹 인프라는 다양한 응용분야 및 생활환경을 배경으로 한다는 특수성으로 인해 서비스의 일반화가 기존의 기간망이나 기업 통신망보다 어렵다는 특성이 있다. 따라서 다양한 사용자의 요구사항을 만족하기 위해서는 홈네트워크는 일반 사용자들이 쉽게 그 정보가전기기들을 사용할 수 있어야 한다. 이를 위해서는 먼저 설정과 유지보수가 간단한 홈네트워크를 갖는 것이 필요하다. 다음으로 홈네트워크 내의 정보가전기기들간의 통신, 홈네트워크 외부의 서비스제공자와의 통신, 그리고 외부로부터의 원격제어 또한 가능하여야하며 상호간의 신뢰성있는 연결을 위한 보안도 필요하다. 따라서 본 논문에서는 위에서 언급한 과제들을 해결하기 위해서 자동 설정, 보안, 이동성 지원, 단순 경로 배정, 그리고 디바이스와 서비스의 발견 등과 같은 IPv6 기능들을 홈네트워크에 적용하는 방안을 고찰하였다.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.11b
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• pp.373-376
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• 2002

가정 내 정보 가전 기기들의 수효가 늘어 가고, 초고속 인터넷 서비스가 일반 가정으로 보급되는 등 가정 내의 정보 통신 환경이 변하고 있다. 이 가정 내 정보 가전 환경을 통합 관리하면서 외부 통신망과의 연계를 담당하는 기기로서 홈 서버가 이용되어 진다. 또한 코덱 기술의 발전으로 인터넷을 통해 원격지로 영상을 송수신할 수 있게 되었다. 본 논문에서는 이러한 정보 가전 환경에서 홈 서버를 기반 시스템으로 한 영상 감시 시스템의 구현에 대해 기술하였다. 본 시스템은 홈 서버 시스템에 X.10 프로토콜을 이용하여 카메라와 같은 디바이스를 제어하도록 하였으며, 통화 호출에 사용하는 프로토콜로는 IETF(Internet Engineering Task Force)에서 권고한 SIP(Session Initiation Protocol) 영상 회의 프로토콜을 기반으로 하였다. 본 영상 감시 시스템은 SIP의 User Agent를 홈 서버에 구현하여 비디오 코덱 등을 연결하였고 SIP의 메시지와 X.10 디바이스 콘트롤을 연동하는 모듈을 추가하여 카메라 선택 등의 디바이스 제어를 하는 동시에 집 외부에서 내부의 상황을 영상으로 모니터링할 수 있도록 하였다.

• Journal of Multimedia Information System
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• v.3 no.4
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• pp.111-118
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• 2016

Today, the proliferation of various mobile devices, such as smart phones and tablet PC, brought changes in the existing TV viewing behavior. People use smart devices as secondary device while watching TV. Researches on a wide range of services linked with second-screen devices around the smart TV in the home network have been actively conducted. While there exist several Web-related technologies for connections between devices, specialized techniques for a second screen service are quite insufficient. There are still some problems related to the display of contents from multiple devices and the efficient transfer of these contents. Considering the characteristics of broadcasting systems In this study, we focus on a second screen service that permits a dynamic transfer of contents by connecting a television (TV) with mobile devices. Here, we propose a second screen service model to enable the personalization of TV contents by combining the existing broadcasting and Web-related techniques.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1998.10a
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• pp.245-248
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• 1998

In this paper, as a forecasting method, the market survey for forecasting demand is introduced for the estimation of subscriber line demand in the optical access networks. The market survey method for the new multimedia services is attempted to collect information directly from customers using the questionnaires for home-users and business-users in local loops. Analysis rationale of questionnaires is suggested to estimate the number of subscriber lines. Also, two measures are presented to quantify the credibility on survey responses; one is the probability that the customer will use the multimedia services and the other is the rate that the subscriber line demand will be actually realized. The former measure is calculated based on the information on customers and the Logit analysis. The latter is obtained by the degree of customer's knowledge about specific services and the customer's willingness to use the services. Based on the values of two measures, the number of subscriber line demand can be developed for installing the optical access networks.

• Journal of Multimedia Information System
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• v.6 no.4
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• pp.329-332
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• 2019

Recently, smart lighting systems are the combination between sensors and lights. These systems turn on/off and adjust the brightness of lights based on the motion of object and the brightness of environment. These systems are often applied in places such as buildings, rooms, garages and parking lot. However, these lighting systems are controlled by lighting sensors, motion sensors based on illumination environment and motion detection. In this paper, we propose an automatic lighting control system using one single camera for buildings, rooms and garages. The proposed system is one integration the results of digital image processing as motion detection, hand gesture detection to control and dim the lighting system. The experimental results showed that the proposed system work very well and could consider to apply for automatic lighting spaces.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1996.06b
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• pp.115-121
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• 1996

Interactive CATV system is under development to provide multimedia applications such as movies on demand, home shopping, etc. In addition to the conventional analog cable TV services. This system applies international standard DAVIC, ATM forum, DSM-CC etc. The system adopts modular architecture design approach so that the system can be adaptive to the fast moving technology wavefront. In this article, interactive CATV system and essential elements such as video server, delivery network and Set-Top-Box(STB) and related international standardization are introduced.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2008.10b
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• pp.634-642
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• 2008

Radio wave is the valuable resources in $21^{st}$ century. It will be widely used in various applications such as DMB, USN, telematics, and home network as well as mobile and wireless communications. Cognitive Radio technology is devised to maximize the utilization of radio resources by sensing near-by spectrum and dynamic and allocating free resources dynamically and adaptively. Wireless links for the secondary user need to be frequently switched to idle frequencies during the transmission of multimedia data in the cognitive radio based system. This may cause delay and information loss, and QoS degradations occur inevitably. The efficient frequency allocation scheme is necessary to support the seamless multimedia service to the secondary user while maintaining QoS of the primary user. This paper suggests a frequency selection scheme which considers other parameters such as cell load, data rate, and available bandwidth than just received signal strength during the frequency selection process. The performance of our proposed scheme is analyzed by simulation.