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이종식(Jong-S. Lee),이판묵(Pan-M. Lee),이종무(Chong-M. Lee),홍석원(Seok-W. Hong) 한국해양공학회 1994 韓國海洋工學會誌 Vol.8 No.1
A 300 meter class ROV(CROV300) is composed of three parts : a surface unit, a tether cable and an underwater vehicle. The CROV300 control system consists of a surface controller and a vehicle controller. The vehicle controller is based on two processors : an Intel 8097 - 16-bit one chip micro-processor and a Texas Instruments TMS320E25 digital signal processor. In this paper, the surface controller, the vehicle controller and peripheral devices interfaced with the processors are described. These controllers transmit/receive measured status data and control commands through RS422 serial communication. Depth, heading, trimming, camera tilting, and leakage signals are acquired through the embedded AD converters of the 8097. On the other hand, altitude of ROV and obstacle avoidance signals are processed by the DSP processor and periodically fetched by the 8097. The processor is interfaced with a 4-channel 12-bit D/A converter to generate control signals for DC motors and several transistors to handle the relays for on/off switching of external devices.
고질소함유 가축폐기물의 호기발효에 있어서 탄소원의 첨가가 질소제거 효율에 미치는 영향
정상현(S . H . Chong),이상락(S . R . Lee),김범석(B . S . Kim),이승훈(S . H . Lee),맹원재(W . J . Maeng) 한국축산학회 1996 한국축산학회지 Vol.38 No.3
This study was carried out to develop a treating technique to reduce nitrogen from the organic-liquid waste with high nitrogen content (OLWHN) by aerobic fermentation. The experiment conducted to examine the effect of carbon-source additions (glucose and sodium acetate) on the rate of nitrogen removal by using a lab-scale aerobic fermentation system. Glucose and sodium acetate as organic carbon-sources were applied to OLWHN discharged from a swine farm and the ratios of BOD_5 to kjeldahl-N were controlled at 100 : 64.5, 100 : 65.5 and 100 : 90.7. The removal rates of total nitrogen, phosphonis, and BOD_5 were not influenced by adding glucose and sodium acetate. On the other hand the removal rate of ammonia-N significantly improved in sodium acetate treatment (P$lt;0.05), when OLWHN was treated in the lab-scale aerobic fermentation system. The results obtained from this study suggest that the ratio of organic carbon source to nitrogen should be used as a crucial factor in removing nitrogen from OLWHN by an aerobic fermentation system.