• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 2004년도 e-Biz World Conference
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• pp.65-72
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• 2004

The Internet is a social and economic foundation, apparently destined for human communication and interaction. It is supposed to allow for more interactive and innovative ways for people to do what they do in 'real lift'. There is no shilly-shallying to say that at present, Internet has become a commanding and useful tool for empowerment and income making in developing countries. It is very difficult to say that at present internet has turned into a popular and useful thing among the Bangladeshi people like students, doctors, engineers, businessmen, researchers as well as politician who are being logged into the internet for getting information what they want. Though the Internet was invented in 1970 but it came late in Bangladesh through UUCPs (Unix-to-Unix copy) email connectivity in 1993 and IP connectivity in 1996. Having launched Internet, on June 1996 National polls result were broadcast through the using of World Wide Web (WWW) that was the first ever practice trial in Bangladesh. On June 1996, the government has approved to allow VSAT (Very Small Aperture Terminal) in the country's private sector to operate as Internet Service Provider (ISPs). At the end of year, there were only two ISPs in the country and number of users near about one thousand only. But next year in 1997, the total number of ISPs was more than a dozen and the clientele growth was ten times higher than that of the previous year. From then, the number of Internet users and ISPs are increasing significantly in Bangladesh. About 40 ISP are providing internet service among as many as 3, 20,000 users at present out of almost 130 license holder ISP provider but among the ISPs, most of the ISPs are placed in Dhaka and few are working in Comilla, Sylhet, Rajshahi, Chittagong and Khulna. It should be mention that currently, broadband internet (Radio, Cable) connection is working side by side dial -up connection where broadband accounts 10,000. This paper will have a comprehensive discussion on the current situations of Internet and some of the contemporary issues in the matter concerned.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.941-944
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• 2015

본 논문에서는 여러 대역의 주파수를 하나의 모듈로 통합하여 선박이 해외 각국에서도 하나의 위성안테나로 사용할 수 있는 다중대역 FEM(Front-End Module)모듈을 설계하였다. 설계된 FEM은 다중대역 저잡음 수신 증폭회로, 주파수 변환 회로, IF 증폭회로, 전압 제어 발진기(VCO : Voltage Control Oscillator)를 이용한 신호발생회로 네 가지 회로로 구성하였다. 다중대역 2.05GHz대역을 변환하기 위하여 4개(대역1, 대역2, 대역3, 대역4)의 국부 발진 신호를 생성하여 4개의 IF신호를 출력하도록 설계하였으며 개발된 변환 장치는 변환이득 64dB, 잡음지수 1dB 이하, 출력 P1dB 15dBm 이상, 위상잡음은 -73dBc@0.1KHz를 나타내었다.