• Journal of the Korea Institute of Information and Communication Engineering
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• v.6 no.8
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• pp.1194-1199
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• 2002

There is big problem that must change contents that is made out by HTML to service existent wire HTML contents in wireless environment to WML, HDML, mHTML. It is Markup language automatic conversion engine that is proposed to solve these problem. But, facility that studied most Markup language automatic conversion engines process text and image information so far is not sufficient. In this thesis, image file format that wireless terminal supports image on wire internet, presented mechanism that change real time automatic and algorithm that can do to optimize output of image which consider screen size of wireless terminal.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.12B
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• pp.800-808
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• 2007

With the development of wireless data communication technology, all IP-based network will become compositions of wired and wireless networks. TCP is a connection-oriented, reliable transport protocol and has been used as de facto standard in most wired networks. Because TCP's congestion control algorithm could not distinguish congestion from BER, link failure and frequent route changes, TCP shows a poor performance over mobile ad-hoc networks. In this paper, the theoretical feature of TCP was studied and the performance of TCP over mobile ad-hoc networks was analyzed with ns2.

• Journal of IKEEE
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• v.11 no.4
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• pp.178-186
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• 2007

Recently, The importance of Ubiquitous network that can be supported useful information to MANET mobile device user through wired internet network in anywhere, anytime is growing rapidly. This proposed algorithm is the research on the algorithm, minimizing network overhead by preventing unnecessary network overhead previously and adapting Local repair mechanism to efficient data transmission when route error happens in network, in GMAHN environment.

• The Journal of the Korea Contents Association
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• v.13 no.9
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• pp.49-57
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• 2013

Recently, in spite of fast development of smartphone, recording technology has saved, listened and searched in server based on PSTN and wired network. We introduce a mobile transcript recording system for mobile office environment. All calls using smartphone are automatically saved on memory in mobile device with this system. Thereafter, recording files are encrypted and uploaded to recording server by user authority. Beside recording data in database on web server is saved and managed efficiently and economically through web application. This system is able to be used in legal corroborative facts and the prevention of crime such as voice phishing.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.389-391
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• 2012

현재에 있어서 무선네트워크의 중요성은 갈수록 높아지고만 있고 데이터를 처리함에 있어서 유선이 아닌 무선을 이용함으로써 사용자들의 간편성 및 신속성이 보장되어지고 있다. 하지만 현재 제안되고 있는 일반적인 무선네트워크인 ZigBee를 이용한 무선네트워크는 데이터 전송에 있어서 영상 등의 대용량의 데이터를 전송 할 경우 유선에 비해 디바이스 간 데이터 처리속도가 매우 낮다. 따라서 본 논문에서는 이러한 문제점을 극복하기 위해 ZigBee와 WiMedia의 결합을 통해 기존 무선 네트워크인 ZigBee를 이용하면서 디바이스간의 통신 방법 개선 및 통신속도향상 그리고 채널 상황에 능동적으로 대처할 수 있는 Distributed MAC프로토콜 기반의 릴레이 협력통신 방안을 제안한다.

• The KIPS Transactions:PartD
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• v.12D no.1 s.97
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• pp.129-134
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• 2005

Web engineering based environment specialty emphasize the importance of networking by producing many kinds of interface devices connected to wireless technology. This Paper is it aims at generating new wireless contents which are available for wireless internet environment by converting and processing wire internet contents. Mobile contents converting module, Converting Solution, which extracts components which can reuse Mobile to provide existing wire internet contents in the Mobile internet environments as it is without necessity for developing or managing sites and contents suitable for various terminals and standard for special use can maximize the efficiency of cost cutting by shorting of productivity and can provide necessary information timely.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10d
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• pp.500-504
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• 2007

CPMS(Classroom Power Management System)는 유비쿼터스 센서네트워크 기술을 적용한 층별 강의실 조명 전원을 관리하는 시스템이다. 강의실에는 조도를 센싱하는 모트와 조명 전원을 제어하는 모트가 설치되어 있어, 주기적으로 센서 데이터 및 강의실 전원 상태를 주기적으로 CPMS서버에 보고한다. CPMS 서버는 베이스 모트를 통해 각 강의실의 방의 제어 모트들과 통신하고 전원을 제어하고, 윈도우즈 GUI 소프트웨어를 통해 모트의 상태를 표시하고, 강의실 사용에 대한 스케줄을 입력하여 관리한다. 본 논문에서 CPMS는 모트간의 통신은 IEEE 802.15.4/Zigbee모듈을 사용하여 구현했고 서버소프트웨어는 윈도우즈 시스템을 기반으로 C# 언어와 MS SQL Server로 구현하였다. 본 시스템은 장치들 간의 통신이 모두 무선으로 이루어지므로 설치가 쉽고, 유선 공사에 드는 비용을 절감한 수 있을 뿐 아니라 유선 공사가 난감한 기존 빌딩에서도 구축할 수 있는 장점이 있다.

• Spatial Information Research
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• v.16 no.2
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• pp.207-218
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• 2008

Providing services in a wireless environment with existing wired-based GIS solutions have many limitations such as slow communication, processing rates and screen size. This study suggested data optimization techniques in a mobile environment to overcome those limitations in four steps. In order to test the methods suggested in the study, experiments are conducted using Gangnam-gu as a test site. An existing GIS engine built in a wired environment was compared with the optimized GIS engine from the study in terms of performance in the same environment. They were also compared and analyzed in terms of response data size, number of requests processed per second, and average time to process a request. The results proved that the proposed engine shows significant improvements in performance compared with the wired GIS.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.4B
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• pp.202-209
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• 2005

In this paper, a dynamic TCP-friendly rate control (TFRC) is proposed to adjust the coding rates according to the channel characteristics of the wireless-to-wired network consisting of wireless first-hop channel. To avoid the throughput degradation of multimedia flows traveling through wireless lint the proposed rate control system employs a new wireless loss differentiation algorithm (LDA) using packet loss statistics. This method can produce the TCP-friendly rates while sharing the backbone bandwidth with TCP flows over the wireless-to-wired network. Experimental results show that the proposed rate control system can eliminate the effect of wireless losses in flow control of TFRC and substantially reduce the abrupt quality degradation of the video streaming caused by the unreliable wireless link status.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.8
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• pp.1696-1702
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• 2005

Real Time Transport Protocol (RTP) is the Internet standard protocol for transport of real time data audio/video IP Telephony, Multimedia Seivece. In case of 8kbps voice codec, the size of packet per data is 20bytes and become more large to minimal 40bytes with adding each layer's header in RTP/UDP/IP. To solve this problem, various header compression skill were suggested on point-to-point networks. But it compress even IP header and cannot be suitable to apply to end-to-end network Thus, We will renew header compression protocol to apply wired router-based network.