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GPS와 근접제어 알고리즘을 이용한 자동항법 시스템 설계
황재문(Zai-Moon Hwang) 한국정보기술학회 2005 한국정보기술학회논문지 Vol.3 No.1
GPS was used from USA amy to soldiers purpose on early. But, is used widely on aircraft and navigation device of ship and minuteness chronometry and Nebigeisyeon for vehicles etc. current. And application field is magnified widely to next generation navigation system. But, most system that use GPS is storing and take advantage of GPS data of specification location. Therefore, must have space to store GPS data of specification location separately. Have shortcoming difficult to adapt in environment change that surprise because take advantage of stored data. Therefore, after small size this same substance moves taking advantage of only location coordinates treatise that see transmits from GPS satellite by real time, it proposed approximation control algorithm to return correctly to start intelligence. And planed automatic movement navigation system that approximation control algorithm is loaded. Time of about 2 minutes information confirmed that is cost to reach to the destination after move these same substance 50 m to verify stability and propriety of system planed with proposed algorithm.
황재문(Zai-moon Hwang) 한국정보기술학회 2007 Proceedings of KIIT Conference Vol.2007 No.-
본 논문에서는 윈도우 2000에서 사용 가능한 Timer IRQ 제어알고리즘과 USART IRQ 제어알고리즘을 적용하여 서로 다른 기종의 키보드를 각각의 플랫폼에서 사용할 수 있는 다중 플랫폼 지원용 키보드 드라이버 및 다양한 키보드 규격에서 사용 가능한 명령어 집합에 대한 제어 알고리즘을 개발하였으며, 이에 대한 하드웨어 시스템을 설계하여 시스템의 안정성 및 타당성을 검증하였다. Keyvoard driver for supporting muli platform was used in multimedia application, which is multimedia game and computer graphic, etc. In this paper, we designed th keyboard driver for supporting multi platform, which is applied timer IRQ control algorithm and USART IRQ control algorithm. Also, we verified the feasibility of system In the result, we expected that keyboard driver for supporting multi platform is utilized in practical application technique of multi keyboard system.
IMU를 이용한 6자유도 모바일 로봇의 구동을 위한 제어기 설계 및 성능평가
강진구(Jin-gu Kang),황재문(zai-moon hwang) 한국컴퓨터정보학회 2014 한국컴퓨터정보학회 학술발표논문집 Vol.22 No.2
본 논문에서는 IMU를 이용한 6자유도 모바일 로봇을 설계하고 성능을 평가해 보았다. IMU를 이용하여 로봇의 Roll과 Pitch 각을 측정하여 모바일 로봇의 이동경로 경사각을 측정하여 지면이 수평 일 때 모바일 로봇의 6바퀴 모두 항상 지면과 닿아 있는 상태를 유지한다. 또한 오르막과 내리막일 경우 로봇의 동역학에 의한 최소한의 에너지를 유지하여 이동이 가능하도록 하기위한 로봇의 제어기를 설계하고 그 성능을 평가해 보았다.
채널 에러율의 상태에 따른 Go-Back-N ARQ 기법의 정보전송율 분석
황재문,강찬석,박진수 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.15 No.3
In nonstationary channels, error rates vary considerably. This paper proposes an effective go-back-N ARQ scheme which estimates the channel state in a simple mamer, and adaptively switches its operation mode in a channel where error rates vary slowly. It provides highter throughput than other comparable ARQ schemes under a wide variety of error rate conditions.
궤환채널의 잡음을 고려한 ARQ 기법의 정보전송율 분석
황재문,정근열,박진수 청주대학교 산업과학연구소 2001 産業科學硏究 Vol.18 No.2
In this paper, in order to find the analytic result of ARQ schemes, retransmission request mechanism have been presented using state diagram with noisy feedback channel. The generator function of signal flow graph have been formulated appling Marson's formula into state diagram, and throughput of ARQ schemes have been analyzed using generator function. Throughout computer simulation, we find that the feedback channel has to be quite noisy before performance of ARQ schemes is seriously affected.
Feedback 에러를 고려한 ARQ 기법의 정보전송율 분석
황재문,박진수 청주대학교 산업과학연구소 1997 産業科學硏究 Vol.15 No.2
Automatic-repeat-request protocols have been analyzed for quite some time, but the issue of error in the feedback channel has nat received much attention. In some applications, such as digital mobile communications, this issue can be Important. Accordingly, this paper examines the effect of feedback errors on the throughputs of the stop-and wait (SW), go-back-N (GBN), and selective repeat (SR) ARQ protocols for the case of a point-to-point channel under some feedback information assumptions. It is shown that the deleterious effects of feedbackerrors on the throughputs of continuous ARQ protocols can be greatly reduced by simple modification in the retransmission operation, provided that the "complete state" of the receiver is sent back with each acknowledgment.
다이버시티 기법을 사용한 위상 동기 FH-SS 시스템의 성능 분석
황재문,강찬석,박진수 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.16 No.-
Frequency diversity for a phase-coherent frequency-hopping spread-spectrum system is proposed. The frequency band of the communicator is partitioned in to L disjoint subbands on which L replicas of the communicator signal are simultaneously transmitted each signal replica hops independently in its subband. Therefore, both phase continuity and coherent optimal combining of the received replicas are possible. Optimum diversity is thus at least 6dB better than a conventional noncoherent FH-SS system. We show that a smart Jammer should be present in all subbands. We also give a sufficient condition that forces the Jammer to spread its intereference signal on the whole communicator frequency band.