• Information and Communications Magazine
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• v.33 no.7
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• pp.53-58
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• 2016

본 논문에서는 전력선(Power Line Communication, 이하 PLC)통신을 이용하여, 납축배터리의 효율적인 충방전 관리 및 배터리 수명의 지표로 쓰일 수 있는 내부저항 측정 방법에 대하여 알아본다. 또한 이러한 시스템에 대한 임베디드 플랫폼을 설계하고, 실제 UPS환경과 연동시 고려해야 할 사항에 대하여 알아본 후, 이를 해결 할 수 있는 방안을 제시한다.

• Proceedings of the KIEE Conference
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• 2006.07c
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• pp.1333-1334
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• 2006

중, 저압 배전 시스템을 통신망으로 사용하는 전력선 통신(PLC, Power Line Communication)에서 신호결합은 하드웨어 측면에서 매우 중요하다. 본 논문에서는 2-40MHz의 통신 신호를 수백 A의 전류가 흐르는 배전선으로 보내고 추출하는 유도성 신호결합장치와 통신신호 손실에 대하여 조사하였다.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.2363-2365
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• 2005

전력선통신 모뎀의 상용화를 위해 필수적인 내용이 사용 주파수 범위, 출력 신호의 크기, 타 통신신호와의 간섭 등에 관한 규제 및 이에 관한 측정 방법의 규정에 관한 것이다. 주파수는 한정되어 있는 국가의 자원이므로 법규 마련 및 규제 완화에는 상당한 어려움이 있으며, 타 통신 신호에 대한 간섭성이 충분히 검토되어야 하는 것이다. 이러한 법규를 개정하거나 신설하기 위하여 실제 사용되고 있는 실증시범현장에서 누설전계강도를 측정하였다.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.596-597
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• 2007

전력선통신 기반의 통합검침시스템을 구축하고 통신프로토콜을 통일하게 되면 각 사업자별 검침용 통신비를 절감할 수 있을 뿐만 아니라, 장비의 유지보수 비용도 절감할 수 있어 저비용으로 효율적인 원격검침이 가능하게 될 것으로 예상된다. 본 논문에서는 전력선통신기반의 통합검침 시스템에 대해 소개한다.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.430-432
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• 2019

본 논문에서는 ESS용 3상 AC/DC 컨버터 배터리 전류 제어 시 발생하는 문제에 대해 분석하고, 제안된 제어기의 유효성을 시뮬레이션을 통하여 입증한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.9 no.1
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• pp.39-45
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• 2009

OFDM is used for achieving a high-speed data transmission in mobile wireless communication systems. Conventionally, fast Fourier transform that is the main signal processing of OFDM is implemented using digital signal processing. The DSP FFT LSI requires large power consumption. Current-mode FFT LSI with analog signal processing is one of the best solutions for high speed and low power consumption. However, for the operation of current-mode FFT LSI that has the structure of parallel-input and parallel-output, current-mode serial-to-parallel and parallel-to-serial converter are indispensable. We propose a novel current-mode SPC and PSC and full chip simulation results agree with experimental data. The proposed current-mode SPC and PSC promise the wide application of the current-mode analog signal processing in the field of low power wireless communication LSI.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.2B
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• pp.176-183
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• 2011

In this paper, we propose the implementation and performance analysis of power line communication based on SISO/MIMO-OFDM which focuses on high speed data transmission in smart grid and future power line grid. We employ Zimmermann frequency model and Middleton Class A model as the multipath power line fading channel and impulse noise channel, respectively. In this paper, in order to improve the three-phase or single-phase PLC performance, we introduce a new MRC (called a&f-MRC) which effectively sums up multiple antenna diversity gain and multipath fading diversity gain. Via simulation, we prove the performance advantage over existing SISO/MIMO systems. In addition, we offer the tradeoff on system design through comparing with MRC, EGC and SC.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.6
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• pp.749-756
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• 2015

In this paper, we propose a unique systolic structure and communication algorithm that maintains a solid link between nodes using synchronous digital communication and enables low power communication. This system was designed by using CC2500 RF transceiver, CC2590 RF front end and C8051F330 low power microcontroller. The measurement of power consumption in the network link shows below $400{\mu}W$ in data transfer rate 320bps. The system constitutes the base unit of low power wireless network that was composed of each seven link nodes having eight sensor nodes. Results of the experiments show that link nodes using a 4Ah battery could operate over 3 years without replacement.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.7B
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• pp.411-421
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• 2007

It is well known that the biggest problem of wireless sensor networks is power conservation. There have been two major approaches to efficiently use energy in wireless sensor networks. One is to use a dynamic power management scheme and the other is to use energy efficient protocols. In the former, the power manager is responsible for managing the proper power state of CPU and each I/O with respect to the events, but the power manager does not concern about the internal operation of the underlying network protocols. Thus such conventional power managers can waste unpredicted power during communication period. On the other hand, the energy efficient protocols are just focused on the power saving operation of the radio PHY. In this paper, we introduce an energy-efficient power saving mechanism that can significantly reduce unwanted power consumption of wireless sensor nodes through the communication event-driven power management. We show that our scheme improves the energy conservation in the entire network through simulations.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.10
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• pp.1986-1993
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• 2015

We investigate the optimal resource and power allocation for device-to-device (D2D) communications in a multicell environment. When D2D links reuse the cellular radio resources, each D2D user will interfere with a cellular link and other D2D links, in its own cell as well as in adjacent cells. Under such situation, we propose a coordinated resource allocation scheme that can handle the intercell interferences as well as the intracell interference. For a given resource allocation, we also formulate a power optimization problem and present an algorithm for finding the optimal solution. The resource and power allocation algorithms are designed to maximize the achievable rate of the D2D link, while limiting the generated interference to the cellular link. The performance of the proposed algorithms is evaluated through simulations in a multicell environment. Numerical results are presented to verify the coordination gain in the resource and power allocation.