• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.816-820
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• 2007

본 논문은 무선랜 기반의 UPnP(Universal Plug and Play) AV(Audio/Video) 장치들을 서로 가까이 근접시킴으로써, 자동으로 네트워크가 형성되고, AV 컨텐츠가 재생되는 기술을 제안한 것이다. 이를 지원하기 위해 무선랜 신호 강도에 의한 근접성 측정 알고리즘과 네트워크 파라메터 설정을 통한 자동 접속, UPnP AV 제어기와 연동하여 자동으로 AV 컨텐츠를 재생하는 방안을 포함한다. 또한 본 논문에서는 데스크톱 및 임베디드 리눅스 환경에서 이를 구현한 내용 및 결과를 기술한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.05a
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• pp.115-118
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• 2001

CSMA/CD 는 경쟁적 매체접근 제어방식으로 충돌현상은 필연적이다. 접속을 시도하는 스테이션의 수가 많아지면 충돌횟수도 증가하고 채널의 이용도가 저하된다. 본 논문에서는 CDMA/CD 방식에 충돌이 발생하였을 때 의도적으로 충돌현상을 지연하고 이를 활용하여 채널을 예약할 수 있는 기능을 포함하는 알고리즘을 제안한다. 예약된 채널에는 예약에 성공한 스테이션만 경쟁에 참여하게 되고 채널을 확보찬 수 있다. 제안된 알고리즘은 실험결과 충돌이 반복적으로 발생하는 현상을 급격히 감소시키며 전체적으로 채널의 이용도가 향상되는 것을 확인하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.2 no.4
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• pp.545-551
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• 1998

The Radio communication by existing SSB, VHF, etc. in a coast station and a base station for military affairs is still used to a very important the device of information delivery or transmitting and receiving by the remote controller to using to the exclusive cable for a equipment established at a long distance. When a number of consumer to connected and operated by a number of transceiver is essential for a circuit controller of ICS, in KOREA, is devoted by import to considerable quantity because of to be delayed development of this field. This Paper has been realized to optimal algorithm and designing of a circuit connection controller by multi-processor to pre-stage for the development of ICS. The H/W is composed able to remote control to circuit connector with the several slave processor and a processor for master, and this has taken possible through without any obstacle to communication circuits of a control signal by FSK system. The S/W make possible monitoring for communication condition of other circuits by means of a serial communication system by the multi-processing. This paper has been studied for connecting to a circuits wished to rapidly and precisely by the full application to a interrupt technique. A technique to control by remote to a number of transceiver is a way increasing to application for a frequency resource of the limited MF/SF, VHF and the existing radio communication technique. According to, this paper will achieve to be the reduction of energy & equipment and multiplicity of information delivery in the general communication and disposal to rapid and exact for the important communication as distress, urgency and safety on the sea.

• ETRI Journal
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• v.14 no.2
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• pp.120-127
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• 1992

슬리브내에서 페룰을 통해 광섬유의 정렬이 이루어지는 광커넥터의 대부분의 접속구조에서 각 구성품간의 어긋남 비정렬요인이 중복되어 나타나게 되므로 접속손실이 매우 큰 영향을 받고 있다. 이러한 접속손실의 향상을 위해 선진 외국에서는 각 구성품의 정밀도 향상과 함께 구성품의 저손실화 조립연구도 수행하고 있다. 본 연구에서는 광섬유 출사면에서의 최대 광도부분을 회전조정하여 최소영역에서 두 광섬유가 정렬, 접속되게 하는 저손실화 조립 장치 개발과 관련하여, 임의로 조립된 상태와 본 연구에서 제안한 적응 제어 알고리즘 (Adaptive Control Algorithm)을 이용하여 광Intensity의 최대부분을 회전조정한 상태와의 삽입손실의 통계적 분포를 비교.분석하였다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.37 no.2
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• pp.17-23
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• 2000

Wireless link has high bit error rate compared with wired link and many users share this limited bandwidth. So it needs more powerful error control code and efficient media access control(MAC) to provide multimedia service reliably. In this paper we proposed efficient MAC frame format based on TDMA using mini-slot for request access. The number of mini-slots is variable based on the result of collision in the previous frame. This dynamic allocation of request mini-slots helps resolve the contention situation quickly and avoids the waste of bandwidth that may occur when there are several unneeded request mini-slots. The simulation results are also presented in terms of channel utilization, call blocking probability and cell transmission delay for mixed traffic environment.

• The Transactions of the Korea Information Processing Society
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• v.7 no.9
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• pp.3011-3018
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• 2000

On ATM networks, ABR services are provided using the remained bandwidth after allocating CBR and VBR traffic. Realtime services such as transmitting audio or video data may be provided using CBR and VBR which have a constrained transmission delay, but in these cases, the communications bandwidth may be wasted. This paper proposes an efficient bandwidth allocation algorithm to transfer real-time data using ABR service. The proposed algorithm guarantees MCR and allocates bandwidth to each connection proportional to its MCR. The proposed algorithm divides the connections in two groups - a satisfied state group and a bottlenecked state group - and enhances bandwidth utilization by allowing the remained bandwidth after allocating the connections in the satisfied state to be allocated to the connections in the bottlenecked state. Our algorithm uses a Queue control function proposed by Ghani[5] to keep the Queue length within some boundary, which makes the transmission delay constant. We simulate and compare the performance of the proposed algorithm with that of the algorithms proposed by ATM Forum[1] and Kalampoukas[2].

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.11a
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• pp.300-300
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• 2004

• Journal of the Korean Institute of Telematics and Electronics C
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• v.36C no.7
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• pp.17-26
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• 1999

In this paper, Bit selectable and Bi-directional Interface Device is described, which can communicate data with the peripheral devices. Specially, an algorithm of truth-table comparison that synthesizes the pulse-type sequential circuit pulse has been proposed to design the Interrupt Generator, and implemented in designing the Interrupt Register. Also, a description of the asynchronous design method is given to remove the clock skew phenomenon, and the output asynchronous control method which finds the optimal clock and controls all the enable signal of the output pins at the same time is presented. Using this technique interface ports have delay time of less-than 0.7ns.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.6
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• pp.1060-1067
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• 2004

In a CDMA system, the rapacity is variable and mainly depends on multiple access interference. The multiple access interference has a deep relationship with transmitted or received power. The capacity of CDMA2000 1x system is considered to be limited by the forward link capacity. In this paper, we show that the transmitted power can represent the total cell load and we propose a load control scheme for CDMA2000 1x system. CDMA2000 1x system has fast power control scheme and we can measure forward link cell load by using total transmitted power. In the proposed algorithm, by monitoring the total transmit power, we can simply adjust data rate to channel conditions and efficiently use radio resources. The proposed algorithm is practical algorithm to implement in the power controlled CDMA systems and enhances the system throughput and quality of service(QoS)

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.343-344
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• 2014

마이크로그리드에서 ESS용 PCS를 모듈화하면 용량의 확장성, 신뢰성 향상 등의 장점을 갖는다. 모듈화 된 인버터는 병렬구조를 갖고 인버터 모듈간의 접속점(PCC)에 공통으로 중요부하를 공유하고 있어 독립운전 시 정확한 부하분담이 요구된다. 또한 독립운전 및 계통연계 모드전환 시 제어기 변동으로 인한 과도상태로 인해 접속점에 연결된 중요부하에 악영향을 끼칠 수 있다. 따라서 본 논문에서는 ESS용 PCS로서 모듈화 된 병렬 인버터가 모드전환 시 과도상태가 없는 무순단 절체 기능을 갖는 마스터-슬레이브 제어알고리즘을 제안한다.