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수온, 광조건 및 밀도에 따른 자바리 (Epinephelus bruneus)의 산소소비 특성
양상근 ( Sang Geun Yang ),지승철 ( Seung Cheol Ji ),문태석 ( Tae Seok Moon ),김경민 ( Kyung Min Kim ),정민환 ( Min Hwan Jeong ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.2
This study investigated the effects of water temperature, photoperiod and population density on oxygen consumption (OC) in the long tooth grouper (Epincphelus bruneus). DC` rate in the longlooth grouper at 15, 20, and 25°C were 85.9±6.9, 107.5±10.1, and 164.0±19.2 mg O2kg-1h1, respectively, indicating a linear increase in OC with water temperature. Photoperiod was regulated in accordance with the light (09:00-21:00 h. L) and dark (21:00-09:00 h, D) phases of the did cycle (12L/12D), with a water temperature of 15, 20, or 25°C`. DC` rates during the light and dark phases were 83.8±5.4.88.1±7.8mg 00 kg-1 h-1, respectively, at 15°C and 111.2±12.3 and 103.7±5.7 mg O, kg-1 h-1 at 20°C. No significant differences were observed between the light and dark phases (P> 0.05). at 25°C the OC rates were 168.8±24.3 and 159.2±11.4mg O2 kg-1 h-1 during the light and dark phases. respectively, indicating that DC. is higher during daylight than nighttime. OC tates at 55.4, 88.4. 118.8, and 145.1 g L-1 were 252.0±11.6, 219.0±8.7, 206.7±11.4, and 208.8±11.4 mg O2, kg-1h-1, respectively, indicating a decrease in DC with increasing population density. However, no significant difference was observed between the values for 118.8 g L and 145.1 g L (P> 0.05).
사육밀도와 수온에 따른 자바리( Epinephelus bruneus )의 적응특성
양상근 ( Sang Geun Yang ),지승철 ( Seung Cheol Ji ),문태석 ( Tae Seok Moon ),손맹현 ( Maeng Hyun Son ),김경민 ( Kyong Min Kim ),허성표 ( Sung Pyo Hur ),이치훈 ( Chi Hoon Lee ),이영돈 ( Young Don Lee ) 한국수산과학회 2014 한국수산과학회지 Vol.47 No.6
The aim of this study was to investigate the effects of stocking density and water temperature in the rearing of the longtooth grouper Epinephelus bruneus . Juvenile fish [mean body weight (BW)=6.9±1.1 g] were raised for 6 weeks, in four density groups of 0.25, 0.5, 0.75, and 1 individuals/L. There were no significant differences in weight gain (WG) or specific growth rate (SGR) among the density groups; however, both WG and SGR tended to be higher in the low density group. After 6 weeks of rearing in temperature-controlled water (23.6±0.8°C) and ambient temperature water (19.6±1.8°C), there were no significant differences in WG or SGR values, but both tended to be higher in the temperature controlled water. The feed efficiency (FE) and daily feed intake (DFI) and WG values were also higher in the temperature-controlled water than in the ambient temperature water. WG values were lower at lower water temperatures. The same pattern was observed for SGR, FE, and FI, all of which exhibited lower values at lower temperatures. In particular, WG, SGR, and FE values all tended to decrease at the 16°C water temperature. The effects of water temperature on 1-year fish (mean BW = 387.6±30.2 g) and 3-year fish (mean BW = 1,338.3±73.8 g) were similar to those of the juvenile fish (0-year fish).
홍상근,최송석,신동조,임재문,Hong, Sang-Geun,Choi, Song-Suk,Shin, Dong-Cho,Lim, Jae-Moon 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.5
A modern artillery use a FMCW Proximity Fuze for effectively target destruction. FMCW Proximity Fuze can be deceived by Jamming Technique because it uses RF for distance estimation. FMCW Proximity Fuze algorithm is similar to FMCW radar's, but normal Jamming Tech. like Noise and Mulitone is useless. Most Shots with FMCW Proximity Fuze have a additional mechanical fuze against RF Jamming. Shots explode by mechanical fuze when Proximity Fuse is Jammed. However, distance Deception is available because shots can not distinguish between deception jamming signal and ground reflected signal. For making Distance Deception Jamming, FMCW signal tracking is demanded. In this paper, we propose a FMCW tracking method and develop the Jammer to show Jamming signal.