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최동유,최동우,박창균 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.2
In this paper examines theoretical analysis of passive intermodulation and its methods of measurement and procedure. And based on the results of field survey, it defines the reasons of passive intermodulation of base stations, suggests methods of improvement to minimize the influence of a base station on passive intermodulation, and compares and analyzes the results of field survey before and after the reasons are improved to secure the characteristics by device and the utility and adequacy of methods of improvement.
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Analysis of Secure Remote Access to Virtual Private Home Network with L2TP Tunneling methods
최동유,한승조,Basukala, Roja Kiran,Choi, Dong-You,Han, Seung-Jo 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.12
홈 네트워크는 전자적이고 전기적인 집의 여러 장치와 여러 이더넷과 같은 기술인 무선네트워크, 전화선, 파워라인의 통합인 인터넷과 연결된 게이트웨이와 통신을 한다. 이런 홈 네트워크는 인터넷에 기초를 두며 인터넷을 통해 모든 사람이 홈 네트워크에 접근을 할 수 있다. 홈 네트워크는 주거인이 편하고 안전한 삶을 위해 발전하며, 정보는 보안을 필요로 한다. 그러므로 홈 네트워크의 모든 리모트 접근은 믿을 수 있어야 한다. 이 논문은 홈 네트워크에 안전한 리모트 접근인 VPN에 기초를 둔 계획적이고 필수적인 두 가지 터널링 보안 방법인 L2TP을 분석 하였다. Home network is the connection and communication of several electronic and electrical devices at hone with the integration of several technologies like Ethernet, wireless, phone line and power-line at the residential gateway to the internet. This internet based home network can be accessed from any part of the world through any device by any poison via internet. Since home network is developed for comfortable and safe life of home users, the information flow to/from home network needs to be private. Hence the remote access of the home network must be secured. This paper analyses two secure tunneling methods, voluntary and compulsory for L2TP(Layer Two Tunneling Protocol) based VPN(Virtual Private Network) for secure remote access of the home network.
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崔東裕,金在燮,李康鉉,朴暢均 대한전자공학회 2002 電子工學會論文誌 IE (Industry electronics) Vol.39 No.3
One of the most important things is Hand-Off(H/O) in mobile phone service. Meantime soft H/O and softer H/O have been used between the same generations(2G↔2G) and there is little problem. With user's needs and the development of communication technology, the system with different generation coexists and pilot beacon and time-periodic beacon are used for H/O between generations(2.5G→2G) to start service, but it is not economic and efficient. To improve such problems, ENHHO developed in April 2001 has recently used. Unfortunately, this method also has the defect of momentary cutoff of communication information during the procedure of H/O in case of more than 5 pilot signals. Accordingly, we suggest algorithm to improve the problem of ENHHO and examines its propriety by analyzing the results of field survey using the algorithm. 이동전화 서비스에 있어서 가장 중요한 것 중 하나가 핸드오프(H/O:Hand-Off)이다. 그동안 동일 세대간(2G↔2G) H/O를 위해 소프트 H/O방식과 소프터 H/O방식이 이용되어 왔으며 별다른 문제점이 없었다. 그러나 사용자의 욕구와 통신기술의 발달로 세대가 다른 시스템이 공존하여 서비스를 시작하므로써 세대간(2.5→2G) H/O를 위해 파이롯 비컨방식과 주기형 비컨방식이 이용되어 왔으나 비경제적이고 능률적이지 못하였다. 이를 개선하기 위해 2001년 4월 ENHHO방식이 개발되어 현재 이용되고 있다. 이 방식 또한 파이롯 신호가 5개 이상인 경우 H/O가 진행되는 동안 통화정보가 순간적으로 단절되는 단점을 갖고 있다. 따라서 본 논문에서는 ENHHO방식의 문제점을 개선하기 위한 알고리즘을 제안하고 이를 이용한 현장측정 결과를 분석하므로써 그 타당성을 검증하였다.
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최동유,김재섭,박창균 조선대학교 에너지.자원신기술연구소 2004 에너지·자원신기술연구소 논문지 Vol.26 No.2
In this study selected Koreasat 3, which uses the Ku-band(14㎓/12㎓) frequency, and analyzed the beacon signal level data according to the rain rate from June to August in 2001. Then to provide analysis, the experimental data was compared with that obtained using typical rain attenuation models, such as the ITU-R model, the SAM model and the Global model, which have previously been used in satellite communication systems. Also, this study analyzed predicted area path diversity gain on the basis of the path of Daejeon-Koreasat 3 in order to compensate excess attenuation caused by rain, and estimated link budget by hour rate on the basis of the ITU-R model. Establishing the reliability of path diversity gain and link budget achieved by this study may be greatly used as a basic material to design satellite communication system in the future. Furthermore, according to methods to be applied, it could be utilized to construct microwave communication network or broadcasting network on the ground.
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최동유,최동우,박창균 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.2
One of the most important things is H/O in mobile phone service. Meantime soft H/O and softer H/O have been used between the same generations(2G→2G) and there is little problem. With user's needs and the development of communication technology, the system with different generation coexists and pilot beacon and time-periodic beacon are used for H/O between generations(2.5G→2G) to start service, but it is not economic and efficient. To improve such problems, ENHHO developed in April 2001 has recently used. Unfortunately, this method also has the defect of momentary cutoff of communication information during the procedure of H/O in case of more than 5 pilot signals. Accordingly, this study suggests algorithm to improve the problem of ENHHO and examines its propriety by analyzing the results of field survey using the algorithm.
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崔東裕,梁洪榮,朴暢均 대한전자공학회 2003 電子工學會論文誌 IE (Industry electronics) Vol.40 No.6
This study proposed a new cell site decision method for minimize the aggravation of speech quality and performance through improving Ec/Io in narrow band CDMA mobile communication system using 1.2288㎒ of spread band. Then the method was compared with existing cell site decision method for cell domain and the results of simulation and field application to examine its effectiveness and validity. 본 논문에서는 확산대역 1.2288㎒를 사용하는 협대역 CDMA 이동통신 시스템에서 통화품질 악화와 성능저하를 최소화하기 위하여 새로운 셀 영역 결정 방식을 제안하고, 이를 기존 셀 영역 결정 방식과 시뮬레이션 및 현장적용 결과를 비교·검토함으로써 실효성과 타당성을 검증하였다.
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최동유,박창균 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.1
The purpose of this study is to suggest the Rx Power prediction model for the sea service as a method to minimize unnecessary facilities investment and maintenance caused by additional or new building of a base station if mobile phone service for far or near distance sea is provided by expanding limited communication zone of narrow band CDMA mobile communication whose spread band FA is 1.2288MHz. Suggested Rx Power prediction model includes five parameters to minimize facilities investment of a base station and maximize channel capacity: equivalent line of sight, time delay by shift resister or chip delay by PN code, antenna altitude, power of base station and gain of antenna. Finally, suggested Rx Power prediction model is simulated and, the results are examined for its utility by comparing with and analyzing free space loss data.
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최동유,김재섭,이강현,박창균 대한전자공학회 2002 電子工學會論文誌 IE (Industry electronics) Vol.39 No.1
이동전화 서비스에 있어서 가장 중요한 것 중 하나가 핸드오프(H/O :Hand-Off)이다. 그동안 동일 세대간(2G↔2G) H/O를 위해 소프트 H/O방식과 소프터 H/O방식이 이용되어 왔으며 별다른 문제점이 없었다. 그러나 사용자의 욕구와 통신기술의 발달로 세대가 다른 시스템이 공존하여 서비스를 시작하므로써 세대간(2.S↔2G) H/O를 위해 파이롯 비컨방식과 주기형 비컨방식이 이용되어 왔으나 비경제적이고 능률적이지 못하였다. 이를 개선하기 위해 2001년 4월 ENHHO방식이 개발되어 현재 이용되고 있다. 이 방식 또한 파이롯 신호가 5개 이상인 경우 H/O가 진행되는 동안 통화정보가 순간적으로 단절되는 단점을 갖고 있다. 따라서 본 논문에서는 ENHHO방식의 문제점을 개선하기 위한 알고리즘을 제안하고 이를 이용한 현장측정 결과를 분석하므로써 그 타당성을 검증하였다. One of the most important things is Hand-0ff(H/O) in mobile phone service. Meantime soft H/O and softer H/O have been used between the same generations(2G$\longleftrightarrow$2G) and there is little problem. With user's needs and the development of communication technology, the system with different generation coexists and pilot beacon and time-periodic beacon are used for H/O between generations(2.5G$\longleftrightarrow$G) to start service, but it is not economic and efficient. To improve such problems, ENHHO developed in April 2001 has recently used. Unfortunately, this method also has the defect of momentary cutoff of communication information during the procedure of H/O in case of mote than 5 pilot signals. Accordingly, we suggest algorithm to improve the problem of ENHHO and examines its propriety by analyzing the results of field survey using the algorithm.
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