• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 합동 추계학술대회 논문집 정보 및 제어부문
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• pp.558-561
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• 2002

In the embodiment of power line modem, the important elements are selection of a suitable line-coupler, choice of a modulation method good for channel environments, and an efficient data coding method etc. In this paper an appropriate modulation method was implemented their results in details and verified by the simulations. The data compensation request techniques that uses error checking was discussed. Finally, application of other modulation method by detection of error rate per bit according to vary of channel error caused by electric equipment that is connected to power line was studied.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2002년도 정기총회 및 학술대회
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• pp.3-8
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• 2002

A new Modem technique - 8-state Superposed QAM(8SQAM) - for use in power and bandwidth limited digital communication system is proposed. The premodulation baseband signal of the 8SQAM system is a double-interval(2Ts) raised cosine pulse superposed with weighted single-interval(Ts) raised cosine pulse. The performance of the 8SQAM, in a nonlinearly amplified multi-channel environment with additive white Gaussian noise(AWGN), inter-symbol interference(ISI), inter-modulation(IM) and adjacent channel interference(ACI), is analyzed via computer simulation. The simulation result shows that the 8SQAM outperforms 8PSK by about 1.6㏈ at BER=$1\times10^{-4}$ when HPA IBO is 1㏈ and channel Spacing, ${\Delta}F$ is 0.417fb.

• 한국수학사학회지
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• 제17권4호
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• pp.77-86
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• 2004

펠릭스 쿨라인은 현대 기하학이 나아갈 새로운 방향을 제시하여 현대 수학에 큰 영향을 미쳤을 뿐만 아니라 수학 교육의 개혁을 주도하여 유능한 과학자들이 탄생하는 데 크게 기여하였다. 2004년 7월 국제 수학 교육 위원회(ICME)에서 처음으로 펠릭스 클라인 메달이 수여된 것을 계기로, 클라인이 에를랑겐 대학교에 교수로 취임되면서 강연하였던 ‘에를랑겐 계획’을 소개하고 그가 현대 수학과 수학 교육에 끼친 영향을 고찰하고자 한다.

• 한국통신학회논문지
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• 제14권1호
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• pp.11-21
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• 1989

본 논문에서는 디지털 신호처리를 이용한 가우시안 저역필터, 위상적분회로, D/A변환기와 보조회로를 사용하여 GMSK변조기를 구현하였다. 가우시안 기저대역 필터의 차단주파수 BbT를 변화시켜 비교적 좁은 전력스펙트럼을 관측하였다. 복조방식은 변별기방식을 사용하였고, Rayleigh fading조건과 가산성 백색 가우시안 잡음 조건에서 16Kbps의 의사랜덤 신호를 전송했을 때 BER 값의 이론치와 실험치를 비교하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 D
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• pp.2637-2639
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• 2002

This paper presents the design and implementation of a baseband Modem using DSP that supports a wireless LAN. It is implemented with DSP and D/A and A/D Converters in baseband and tested without using IF and RF modules. In this paper, we have used the matched filler and DLL(delay lock loop) for synchronization. And the matched filter and the carrier recovery are directly connected. Therefore, the proposed architecture is very simple and the operation of DSP becomes fast.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1995년도 춘계학술대회
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• pp.167-170
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• 1995

A quadrature-channel MODEM using amplitude modulation was constructed. To test the MODEM, 6.4 MHz sinusoidal wave 1 KHz triangular wave were modulated, then the modulated signal was fed into the demodulator, to reconstruct the triangular wave.

• 대한안전경영과학회지
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• 제2권1호
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• pp.99-116
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• 2000

Accident statistics cite the flightcrew as a primary contributor in about 70 percent of accidents involving transport category airplanes. The introduction of modem flight deck designs, which have automated many piloting tasks, has reduced or eliminated some types of flightcrew errors, but other types of errors have been introduced. To identify the impedimental factors in highly automated modem airplane cockpit systems, this study used readily available information sources and case study, From the evidence, this study identified issues that show vulnerabilities in pilot management of automation, situation awareness, communication between pilots and controllers, pilot's training and evaluation methods. The next step will require the aviation community to solve these problems for the safety improvement.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.917-920
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• 2006

It is possible to make a practical application for many services by using Home Networking. It's brings much improve the quality of our life. Remote control communication should be made by Home Network but present networks are generally using wireless Internet. But, this method don't use exist home and not install wireless internet. Because It need to many devices. Therefore, in this paper we implement gas valve remote control system using RPM(Radio Packet Modem). We can easily installing systems and operating. This system provide different solution for Home networking.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2001년도 추계종합학술대회
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• pp.415-418
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• 2001

우리 나라에서는 공중통신망에 접속되는 단말장치에 대하여 통신망 안전을 위한 기술기준을 정하여, 유통되는 장치들은 이 기술기준을 만족하게 하는 형식승인제도를 운용하고 있다. 최근의 초고속 정보통신망의 활발한 이용과 더불어 기존의 기술기준을 보완하는 작업이 이루어지고 있으며, 이 논문에서는 대표적인 안건으로써 ADSL 모뎀과 전력선통신용 전송장치에 관한 기술기준의 제정 방안에 관하여 논의하였다.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2001년도 춘계학술발표대회 논문집
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• pp.69-72
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• 2001

We are defined a space as the activities of creating value in harmonic relations between human and environment. After Industrial Revolution, relations between human and space is changing because of speed and visualization's power in contemporary society. We we known information where is far by means of visualization. There is only difference of speed. Movement in space means the line of vision and circulation. But it is tried to think relations between human and space again in result to experience indirectly. This study aims at the analysis of expression of the modem Architecture space in Giedion' Space, Time, Architecture and aesthetic systems applied to it. On the basis of that , this study analyzed the difference of Bergson' consideration from Modern Architecture about movement.