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Design and Performance Evaluation of Plasma Air Cleaning Systems for Removing Yellow Sand Dust
이재근,강태욱,안영철,황유진,Ju-Ho Ock,Seong-Chan Kim,Hyung-Soo Noh,Chang-Gun Lee,Kam-Gyu Lee 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.1
Yellow sand dust (Asian dust storms) causes harmful damage indoors and outdoors during the springtime, and the removal of Yellow sand dust has become an issue for suitable indoor conditions. An air cleaner is required to remove Yellow sand dust efficiently to improve indoor air quality, and the removal characteristics of Yellow sand dust should be studied. The size distribution and mass concentration of Yellow sand dust observed in China and Korea are analyzed, and the removal efficiency of a plasma air cleaning system based on the principle of electrostatic precipitation is evaluated by using Yellow sand dust. Mass median diameter of Yellow sand dust sampled in Beijing and Seoul ranges from 7.0 to 8.0 mm with a mass concentration of 300-1,462 mg/m3. For a single-pass test, the efficiency of dust removal increases with increasing particle size and decreasing flow rate. The removal efficiency of Yellow sand dust in a plasma air cleaning system at a face velocity of 1.0 m/s is higher than 80%. For a multi-pass test in occupied spaces, the operation time required to reduce Yellow sand dust concentration from an initial concentration of 300 mg/m3 to 150 mg/m3 is 10 minutes for a test room of 27 m3.
닭의 인공수정에 있어서 적정 주입 정자수 및 주입간격에 관한 연구
이재근,안해범,정선부 ( J . K . Lee,H . B . Song,S . B . Chung ) 한국축산학회 1978 한국축산학회지 Vol.20 No.1
This experiment was carried out to determine the optimum amount of semen (sperm number) to use per insemination and intervals between insemination in artificial insemination of hens. The experimental birds used were 240 hens and cocks of White Plymouth Rock inbred line at 7 months of age. The four treatment compared were: 20 million sperms per 0.005 ㎖ (T1), 40 million sperms per 0.01 ㎖ (T2), 80 million sperms per 0.02 ㎖ (T3) and 120 million sperms per 0.03 ㎖ (T4). Thirty birds were allotted per treatment within a replication, and there were two replications in the experiment. Ringer`s Solution was used for diluent of semen (1 : 3), and semen was inseminated within 30 minutes after collection. The interval between inseminations was 5 days. The results obtained are summarized as follows: 1. The fertility for 5 days after second insemination was 58.2% for T1, 73.1% for T2, 75.1% for T3 and 77.8% for T4. The differences among 72, T3 and T4 were statistically insignificant. 2. In order to obtain a maximum level of fertility in a flock with low egg production and low fertility such as the flock used in this study, the optimum internal between inseminations appears to be 2 days for T2 and 3 days for T3 and T4.