• 한국국방경영분석학회지
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• 제27권2호
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• pp.110-123
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• 2001

This paper deals with the application of commercial mobile communication system for improvement of the military mobile wireless communication systems. Currently, commercial mobile communication systems are rapidly growing from first and second Generation system to third and forth Generation system, which can provide multimedia service of high speed and high capacity(e.g., IMT-2000). If we adapt these emerging commercial technology for the military communication, the military will have many benefits in terms of cost saving, early operational deployment and performance. And it is possible to support the communication necessary in the future warfield operational environment. Therefore, we analyzed differences between commercial systems and military systems, and adaptability in terms of security, survivability and performance. Finally, we proposed a stepwise utilization scheme to improve the military mobile wireless communication

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2004년도 한국우주과학회보 제13권2호
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• pp.59-59
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• 2004

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 1991년도 한국시뮬레이션 연구회
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• pp.41-77
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• 1991

A large number of R & D projects in automobile information and communication systems have been achieved in these twenty years to improve various aspects on automobile usage. Examples on simulation for evaluation of these systems such as these on road to vehicle communication, inter-vehicle communication, and vehicle guidance are shown.

• 한국통신학회:학술대회논문집
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• 한국통신학회 2004년도 하계종합학술발표회논문초록집
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• pp.387-387
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• 2004

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1993년도 Fifth International Fuzzy Systems Association World Congress 93
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• pp.857-860
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• 1993

In this paper, we apply the self generating neuro fuzzy model (SGNFM) to the dimension analysis of the chaotic time series. Firstly, we formulate a nonlinear time series identification problem with nonlinear autoregressive (NARMAX) model. Secondly, we propose an identification algorithm using SGNFM. We apply this method to the estimation of embedding dimension for chaotic time series, since the embedding dimension plays an essential role for the identification and the prediction of chaotic time series. In this estimation method, identification problems with gradually increasing embedding dimension are solved, and the identified result is used for computing correlation coefficients between the predicted time series and the observed one. We apply this method to the dimension estimation of a chaotic pulsation in a finger's capillary vessels.

• 한국전자통신학회논문지
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• 제12권4호
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• pp.555-560
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• 2017

현재 우리나라의 철도 무선통신시스템은 각 지역에 따라 서로 다른 통신방식을 사용하고 있다. 철도 무선통신시스템에서 데이터의 전송률을 높이고 고신뢰성을 확보하기 위해 LTE-R방식의 도입이 연구되고 있다. 본 논문에서는 LTE-R방식을 포함한 다양한 철도통신 방식을 연동하는 기술 개발에 대해 소개한다. 먼저 다양한 철도통신 방식을 연동하는 두 가지방식의 개념 및 표준에 대해 소개한다. 또한 연동방안에 대한 실제 실험결과에 대해서도 일부 소개한다. 본 논문에서 소개하는 연동 기술을 철도 무선통신망에 적용함으로써 끊김 없고 안정적인 철도 무선통신환경이 제공될 것으로 예상된다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제53권6호
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• pp.380-387
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• 2004

In accordance with the computerization of railway signaling systems, the interface link between the signaling systems has been replaced by a digital communication channel. At the same time, the importance of the communication link has become increasingly significant. However, there are some questionable matters in the current state of railway signaling systems in KNR. First, different communication protocols have been applied to create an interface between railway signaling systems although the protocols have the same functions. Next, the communication protocols currently used in the railway fields have some illogical parts such as structure, byte formation, error correction scheme, and so on. To solve these matters, the standard communication protocol for railway signaling systems is designed. The newly designed protocol is overviews in this paper. And the simulation is performed to analysis the performance of data link control for designed protocol. According to this simulation, it is identified that the link throughput of new protocol is improved about 10% and the frame error rate is improved than existing protocol. And it is verified the safety and liveness properties of designed protocol by using a formal method for specifying the designed protocol. It is expected that there will be an increase in safety, reliability and efficiency in terms of the maintenance of the signaling systems by using the designed communication protocol for railway signaling.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2004년도 한국우주과학회보 제13권2호
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• pp.55-55
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• 2004

• Journal of Communications and Networks
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• 제18권3호
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• pp.320-326
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• 2016

In existing literature on multiple-input multiple-output (MIMO) relaying communication systems, antenna selection is often implemented by maximizing the channel capacity or the output single-to-noise ratio (SNR). In this paper, we propose an energy-efficient low-complexity antenna selection scheme for MIMO relaying communication systems. The proposed algorithm is based on beamforming and maximizing the Frobenius norm to jointly optimize the transmit power, number of active antennas, and antenna subsets at the source, relaying and destination. We maximize the energy efficiency between the link of source to relay and the link of relay to destination to obtain the maximum energy efficiency of the system, subject to the SNR constraint. Compared to existing antenna selection methods forMIMO relaying communication systems, simulation results demonstrate that the proposed method can save more power in term of energy efficiency, while having lower computational complexity.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.257-259
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• 2006

The Communication Ocean Meteorological Satellite (COMS) is a geostationary satellite being developed by Korea Aerospace Research Institute. Geostationary Ocean Color Imager (GOCI) is one of the payloads embarked on the COMS satellite. It acquires ocean images around Korea in 8 visible spectral bands with a spatial resolution of about 500 m. The acquired data are used to provide forecasting and now casting of the ocean state. The GOCI operations are controlled by the satellite embedded software, i.e. on-board software. This paper introduces the GOCI payload of the COMS satellite and describes the control software for the GOCI.