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Factorial Experiment for Air Blower of the Pepper Harvester
신서용,김대철,강영선,조용진 한국농업기계학회 2020 바이오시스템공학 Vol.45 No.4
Purpose The present study intended to determine the optimal separating factors of the self-propelled pepper harvester. Methods The separating factors were rotational speed of 1600, 1800, and 2000 rpm; the slope angle of 34, 41, and 48 degrees; and the separating number of wind guides at the outlet of the air blower. The resulting performance of the pepper harvester was appraised by analyzing the rates of pepper separation and foreign materials in leaves. Results The rates of pepper separation tended to be declining according to the number of outlet guides in operation. The higher levels of speed of rotation and slope angle rendered higher rates of separation of foreign materials. Under the condition of the rotation speed of 1600 rpm with the operation of three wind guides, the rate of separation of foreign materials appeared as 29.9% lower than the case of operation of no wind guides, and the changes in the rate of separation foreign matters with the slope angle varied according to increasing speed of rotation, appeared negligent. Conclusions It was concluded that the optimal condition of operation comprising the rotation speed of 2000 rpm and 34° of slope angle of air blower, and simultaneous operation of three wind guides at the outlet thereof, can return over 95% of the rate of pepper separation in the case of less than 5% of the rate of mixing with foreign materials. Thus, the optimal combination of operating conditions needs to be complemented through actual field tests of the pepper harvester.
김우찬,김수환,신서용 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-
All optical wavelength conversion is demonstrated using a cross-gain modulation characteristics of semiconductor optical amplifier(SOA). Input signal wavelength of 1.30684um has been shifted to the wavelength of 1.30496um. Power penalty was about 5dB. When considering the low power level of the source lasers, fixed injection current to SOA, and the limited selection of laser wavelengths. we expect penalty free and wider range of wavelength conversion in the near future by improving experimental circumstances.
비대칭 이중층 셔플넷 구조를 갖는 WDM네트워크의 채널 공유
이승원,신서용 明知大學校 産業技術硏究所 1999 産業技術硏究所論文集 Vol.18 No.-
Multihop lightwave networks are the optical-fiber based local communication systems that use WDM(Wavelength Division Multiplexing) technology to maximally utilize the enormous fiber bandwidth without requiring tunable tranceivers. In this paper, we introduce an asymmetric bilayered ShuffleNet topology, we also discuss channel sharing problem through TDMA and WDMA schemes. Specially, using WDM Cross-Connect, we could minimize the number of channel in asymmetric bilayered ShuffleNet.
김수환,신서용 明知大學校 産業技術硏究所 1998 産業技術硏究所論文集 Vol.17 No.-
Polarization matching in a heterodyne optical receiver system is indispensible to recover transmitted optical baseband signal. In this paper, we propose a new high-speed endless polarization controller composed of four liquid crystal phase retarders. We developed a new peak-search algorithm for true maximum optical power in a heterodyne receiver. we also implemented polarization-controlled heterodyne optical receiver system using proposed method. We expect endless polarization controller's speed of several millisecond, which was verified by computer simulation and system experiment.
김수환,신서용 明知大學校 産業技術硏究所 1997 産業技術硏究所論文集 Vol.16 No.-
The performance characteristics of a new polarization control scheme for coherent optical communication system is numerically analyzed. The scheme employs endless polarization control method so that the state-of -polarization(DOP) of the light from a local oscillator always tracks to the arbitrary DOP of a transmitted light signal. The SOP controller is consisted of four liquid crystal phase retarders for endless control. The simulated result of the new scheme shows that the SOP of the local oscillator light matches perfectly to any arbitrary SOP of the transmitted signal.