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이유종(Y.J.Lee),박필진(P.J.Park),김창규(C.K.Kim) 동의대학교 정보통신연구소 2001 정보통신연구지 Vol.1 No.-
Transmission and MPEG encoding characteristics of real time moving picture images using L-band transmitter and receiver which can be used for micro-aerial vehicle(MAV) application are reported. NTSC picture images are transmitted from a moving vehicle with transmitter power of 50 mWatts at 970 MHz carrier frequency for frequency modulation(FM). Received signal is demodulated and compressed with an MPEG encoder installed in a notebook PC in real time. MPEG images show favorable data reduction ration greater than 100 from uncompressed data and also show better image quality and continuity than those of avi images. Experiments show very encouraging image quality applicable to MAV surveillance and observation.
국내 계란 유통과정에 있어서 난질의 상태에 관한 연구 1 . 계절에 따른 난질의 변화
안병윤,김종원,이유방 ( Byung Y . Ahn,Jong W . Kim,Yu B . Lee ) 한국축산학회 1981 한국축산학회지 Vol.23 No.2
A total of three thousand sample shell eggs (collected twice a month for one year from the five selected market channels) were evaluated to determine the seasonal variations of interior and interior egg quality. The results obtained are as follows ; 1. The price of market eggs way high in Spring (March-May) and Autumn (Sept-Oct), and low in Snmmer(Jun-Aug) and Winter(Nov-Jan). The maximum price spread was ±18% from the average price of the year. 2. Average egg shell thickness was 0.36㎜ with noticeable seasonal variation. It decreased to 0.33㎜ in Summer (Jun-Sep) while increased to above 0.36㎜ in the cool season of from Oct to March. Percent shell breakage was more closely related to environmental temperature than to ,hell thickness, resulting in the highest incidence of breakage in Winter due to freezing. 3. Haugh unit and yolk index showed wide seasonal variations ; 70 and 0.44, respectively, between Dec and Apr ; whereas 52 and 0.35, respectively, in .June and July when the environmental temperature was high and eggs were not moving fast through the market channels. 4. The pH value of whole egg also showed similar seasonal variation, ; 7.2-7.4 between Dec and Apr, while 7.8-8.0 from May to July and in Nov. Such a variation was closely related to the environmental temperature and the supply-demand of market egg. 5. To minimize the seasonal variation in egg quality, marketing system must be modernized with the improvement of handling facilities and the speedup of movement of egg, through the market channels.
국내 계란 유통과정에 있어서 난질의 상태에 관한 연구 3 . 세란처리 ( 洗卵處理 ) 및 저장온도가 난질에 미치는 영향
안병윤,김종원,이유방 ( Byung Y . Ahn,Jong W . Kim,Yu B . Lee ) 한국축산학회 1981 한국축산학회지 Vol.23 No.2
This study was carried out to determine the degree of microbiological contamination of egg shells, the effect of washing treatment on microbial population and the effect of storage temperature on weight loss and egg quality. The results obtained are as follows 1. A significant difference was observed in microbial population depending on the degree of shell cleanliness. The heavily stained eggs showed 3.2×10^7 microbes per shell, moderately stained ones 1.9×10^6 and clean ones 2.7×10^5. 2. Washing treatment of eggs with detergent cleaning solution(130 ppm of effective chlorine) was effective in reducing the microbial population by a factor of 1000 over the controls. The number of microorganisms gradually increased during storage either at room temperature (25-30℃) or at refrigeration. (4℃). 3. Storage of fresh eggs at 16℃ (ground water temperature in hot summer in Korea) showed no appreciable loss in egg quality up to 2 week; whereas, storage at room temperature(25-30℃) showed a rapid deterioration of quality and the eggs were rated below A grade after 4 days of storage.