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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.
대관령지역에 있어서 낙농가를 위한 청예용 사초생산에 관한 연구 1 . 사초용유채 ( Brassica napus Subsp . oleifera ) 의 적응성 및 파종시기에 관한 시험
김창주(C . J . Kim),김병완(B . W . Kim) 한국축산학회 1987 한국축산학회지 Vol.29 No.7
This experiment was conducted as a part of the studies on the soiling forage production for the dairy farm in the Taekwanryong area, to investigate the adaptability of forage rape and determine the proper time of sowing in the Taekwanryong area. Two cultivars of forage rape (Brassica napus Subsp. oleiferaJ, Akela and Ramon, and a cultivar of oilseed rape, Halla, were sowed at intervals of about 10 days according to the treatment plan from the early August to the early October 1986 on the experimental field (815m above sea level) located Hoengke-ri Toam-myon Pyongchang-gun Kangwon-do, Korea. The results obtained were summarized as follows: 1. In Taekwanryong area, Ramon showed apparently higher adaptability than Akela, while Halla the lowest adaptability among the three cultivars. 2. In Taekwanryong area, the forage rape for soiling should be sowed not later than late August, and`for grazing not later than early September. 3. In Taekwanryong area, it is thought that the sowing and growing of the forage rape will be possible in summer season. 4. In Taekwanryong area, if the forage rape is grown as a second cropping on the fallow fields of cool high3and summer vegetables, it is expected that land productivity will be raised. 5. In plant length measured at the harvesting time, 70 days after the sowing, Akela marked 49.3㎝, 32.8∼36.9㎝, and 19.2㎝ in the plot sowed early August, middle and late August, and early September respectively; while Ramon was longer than Akela by average 3.2㎝ through those plots. 6. In fresh forage yield, harvested 70 days after the sowing, Akela recorded 47.73t/㏊, 27.78∼32.60t/㏊, and 17.18t/㏊ in the plot sowed early August, middle and late August, and early September respectively; while Ramon yielded more than Akela by average 6.38t/㏊ through those plots. 7. In dry matter yield, harvested 70 days after the sowing, Akela and Ramon produced respectively 6.48t/㏊ and 7.11t/㏊ in the early August sowing plot, 4.50∼4.82t/㏊ and 5.37∼5.68t/㏊ in the middle and late August sowing plot, and 2.84t/㏊ and 3.32t/㏊ in the early September sowing plot. 8. The plot sowed middle September presented scanty yield with 3.05∼4.82t/㏊ in fresh forage yield, and 0.52∼0.86t/㏊ in dry matter yield; while the plots sowed later than the middle September marked only trace in both fresh forage and dry matter yield. 9. Dry matter ratio measured at the harvesting time recorded 16.2% in Akela, 15.2% in Ramon and 14.2% in Halls.