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사정환(J.H. Sa),박수형(S.H. Park),김창주(C.J. Kim),강희정(H.J. Kang),김승범(S.B. Kim),김승호(S.H. Kim) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
In this work, a comparative study is performed for simulation of rotor in hovering flight with a 3D compressible Navier-Stokes solver using overlapped grid systems. The shape of rotor blade consists of optimized rotor blade planforms. Optimized blade planforms are designed considering high performance on hovering and forward flight. To show the verification of optimized rotor blade planforms, blade loading(C<SUB>T</SUB>, FM, C<SUB>Q</SUB>) and the vortex behavior of optimized blade shape are compared with original blade shape.
New Zealand 산 도입목초의 강원지역에 있어서 적응성 비교시험
김창주,장병호,이창덕 ( C . J . Kim,B . H . Chang,C . D . Lee ) 한국축산학회 1978 한국축산학회지 Vol.20 No.3
A comparative experiment was carried out in Chunchon and Taekwanryong, Kangwondo to test the adaptability of pasture plants introduced from New Zealand. The New Zealand introduced pasture plants tested in this experiment were orchargass-Apanui(O-A), perennial ryegrass-Ruanui(P-R), Tama ryegrass(Ta), timothy-Kahu(Ti-K), white clover-Huia(W-H), alsike clover(As), red clover-Hamau(R-H) and alfalfa-Wairau(Af-W); besides those plants U.S.A. introduced orchardgrass-Potomac(O-P) and Ladino clover(L), Canada introduced perennial ryegrass-Norlea(P-N) and Australia introduced tall fescue-Demeter (Tf-D) were included in this experiment to compare with the New Zealand introduced pasture plants. The Chunchon experimental field(94m above sea level) was sown on the 8th of May 1977 and the Taekwanryong experimental field(820m above sea level) on the 10th of 1May 1977, and the experiment was carried on until April 1978. The results obtained were summarized as follows: 1. O-A and P-R were slower in early stage growth, lower in the year total yield of dry matter and poorer in wintering record than O-P and P-N respectively. 2. O-A and P-R seemed to unsuitable varieties for the Kangwon area. 3. Ta, which proved to be annual, was thought to be utilized sooner after the sowing because its early stage growth was extremely vigorous. 4. Ta demonstrated abundant production marking 10.99 t/㏊ in the year total yield of dry matter in the Taekwanryong experimental field. Nevertheless, Ta`s summering record was inferior in the Chunchon experimental field. 5. In the both experimental fields of Chunchon and Taekwanryong, Ti-K showed a poor record in summering and presented a low year total yield of dry matter but it was found to be outstanding in winter survival. 6. W-H was regarded to have the strongest winter hardiness among the legume plots, yet it marked rather a lower dry matter yield. 7. It is presumed that R-H will find no difficulty in wintering even in the alpine region but will fall into trouble in summering in the lowlands. 8. Af-W made poor growth in both the Chunchon and Taekwanryong experimental field. 9. Though L recorded the highest year total yield of dry matter among the legume plots, most of L were winterkilled in the Taekwanryong experimental field. 10. O-P and Tf-D presented comparatively good record in summering and wintering, and Tf-D showed the highest year total yield of dry matter in the Chunchon experimental field presenting 6.01 t/㏊. 11. P-N and As revealed comparatively strong winter hardness even in the Taekwanryong experimental field. 12. In the year total yield of dry matter the Taekwanryong experimental field was larger than the Chunchon experimental field by 79.1% in the grasses and by 13.8% in the legumes.
김창주,Kim, C.J. 한국전자통신연구원 2006 전자통신동향분석 Vol.21 No.4
유비쿼터스 정보화사회의 도래와 함께 한정된 주파수자원에 대한 수요가 증가됨에 따라 이를 효율적으로 이용하기 위한 기술이 더욱 각광을 받고 있다. 이중에서도 스펙트럼 환경을 측정하여 사용하지 않은 주파수를 선정, 기존의 전파환경과 양립하면서 통신을 하는 CR 기술은 미래 무선통신의 핵심 기술로 인식되고 있다. CR 기술은 SDR 기술을 기반으로 스펙트럼 센싱(spectrum sensing) 기능을 활용하여 가용한 주파수를 선정하여 통신하는 기본적인 기능과 여러 가지 환경 파라미터를 지속적으로 업데이트하는 learning algorithm이 합쳐진 기술이다. 본 고에서는 CR 기술을 설명하고, CR의 응용으로 현재 표준화가 진행되고 있는 IEEE 802.22 WRAN 표준화 활동과 WG에서 검토되고 있는 기술, 즉 physical layer, MAC layer, 그리고 spectrum sensing의 주요기술을 소개한다.
김창주(C . J . Kim),김병완(B . W . Kim) 한국축산학회 1993 한국축산학회지 Vol.35 No.1
This experiment was carried out as a part of the studies on the soiling forage production for the dairy farm in the Taekwanryong area to investigate how much does the forage rape/rye mixture increase its forage productivity compared with the single cropping of those forage crops, and to determine the appropriate sowing Fate of the mixture and the opportune time of sowing in the Taekwanryong area. Five treatment plots different in cropping method were sown at intervals of ten days from the middle August to the early September 1990 on the experimental field (840m above sea level) located in Hoengke-2-ri Toam-myon Pyongchang-gun Kangwon-do, Korea. The five plots consisted of the plot of rape single (sown 10㎏/㏊ of rape), rye single(sown 120㎏/㏊ of rye), rape/rye mixture 1 (sown 10㎏/㏊ of rape and 120㎏/㏊ of rye). rape/rye mixture 2 (sown 7㎏/㏊ of rape and 84㎏/㏊ of rye) and rape/rye mixture 3 (sown 5㎏/㏊ of rape and 60㎏/㏊ of rye). Each of the plots was cut 75 days after the sowing respectively in the autumn of the year sown, and all the plots were cut simultaneously in the spring next year (6. June 1991). The results obtained were summarized as follows; 1. In this experiment the most opportune tune of sowing among the three kinds of sowing tune seems to be the middle August. 2. In both of the fresh forage yield and the dry matter yield, the plot sown in middle August recorded the highest yield among the three treatment plots different in sowing time. 3. In the yield of the autumn cut of the ;plots sown in middle August, the highest fresh forage yield among the flee treatment plots different in cropping method was marked by the rape single plot with 47.15 t/ha and the second highest fresh forage yield was marked by the mixture 2 plot with 41.62 t/ha, and the top dry matter yield was recorded by the mixture 2 plot with 6.35 t/ha: the mixture 2 plot produced more fresh forage and dry matter than the rye single plot by 63.3% and 27.8% respectively. 4. In the total yield of the autumn cut forage plus the spring cut forage of the plot sown in middle August, the highest yield of fresh forage among the five plots treated by different cropping methods was found in the plot of mixture 2 with 71.97 t/ha (DM yield: 13.45 t/ha) and the highest yield of dry matter was recorded by the plot of rye single with 14.66 t/ha. 5. For a seasonally well-balanced supply of soiling forage from autumn to the following spring, mixture cropping of rape and rye is more advisable than single cropping of those crops. 6. In view of improving the productivity and quality of forage the mixture 2 plot, in which each crop was sown with 70% of their standard sowing rate in single cropping, seems to be sown with the most appropriate sowing rate among the three kinds of rape/rye mixture. 7. In feed value of the autumn cut forage, the mixture plots were better than the rye single plot. 8. In chemical composition of the autumn cut forage. crude portein content and crude fiber content were respectively 17.46% and 22.13% in the rye single plot, and respectively 19.95% and 16.71% in the mixture 2 plot. 9. In plant length of the crops sown in middle August, throughout all the plots treated by the different cropping methods, the autumn cut`s rape and rye were respectively 45.8-47.5 ㎝ and 61.1-62.4 ㎝ and the spring cut`s rye was 136.5-137.9 ㎝. 10. In the autumn cut`s botanical composition of the mixture 2 plot sown in middle August, rape and rye were 65.2% and 34.8% respectively. 11. In dry matter ratio of the forage sown in middle August, throughout all the plots treated by the different cropping methods, the autumn cut`s rape and rye were respectively 13.0-14.1% and 19.4-20.2%. and the spring cut`s rye was 22.9-24.3%.