CRT의 不要放出源解析을 위한 電子빔의 3次元的映像表示시스탬의 開發

李成律(S. Y. Lee),中西壽夫(H. Nakanishi),李茂永(M. Y. Lee) 한국통신학회 1994 한국통신학회 학술대회논문집 Vol.1994 No.7

전달함수 변환에 의한 새로운 방법의 직류 대 직류 강압형 변환기 제어

강명숙(Kang M. S),마진석(Ma J.S),임성운(Im S. W),구본호(Koo B. H),이무영(Lee M. Y),권우현(Kwon W. H) 대한전기학회 1997 대한전기학회 학술대회 논문집 Vol.1997 No.7

청예용 호밀의 수확시기와 후작 사일리지용 옥수수의 파종기가 연간사초수량과 사료가치에 미치는 영향

김동암(D . A . Kim),이무영(M . Y . Lee),조무환(M . H . Jo),권찬호(C . H . Kwon),한건준(K . J . Han) 한국축산학회 1988 한국축산학회지 Vol.30 No.11

An experiment was conducted to determine the effects of harvesting date of rye and planting date of succeeding corn grown for silage on annual forage yield and quality of rye - corn double cropping system during the two - year period 1986-1987 at the Experimental Livestock Farm, College of Agriculture, Seoul National University, Suweon. The results obtained are as follows: Crude protein (CP) content and in vitro dry matter digestibility (IVDMD) of forage rye was decreased with the later dates of harvesting, but acid detergent fiber(ADF) and neutral detergent fiber(NDF) contents were increased. Average CP, ADP, NDF contents and IVDMD of forage rye harvested on April 20 were 22.7, 24.7, 42.8, and 89.7%, respectively, but those of rye harvested on May 13 were 12.2, 42.9, 74.4, and 70.7%, respectively. Dry matter, CP and IVDDM yields of forage rye were significantly increased (P $lt;0.05) with the later dates of harvesting. Average dry matter yields of rye varieties harvested on April 20 and 30, and May 13 were 2,830, 4,062, and 7,814 kg/ha, respectively. Dry matter, CP and IVDDM yields of Elbon(early) and Koolgrazer(Early-Medium) harvested at different dates were significantly higher than those of Kodiak(late) with the exception of CP and IVDDM yields harvested on May 13. Dry matter yield of early maturing rye was markedly higher than that of late maturing rye when harvesting was specially made at the earlier date of April 20. Crude protein content and IVDMD of corn varieties were not consistent with planting dates and varieties, but ADf and NDF contents of early maturing corn were slightly higher than those of late maturing corn at the same harvesting date. Average dry matter, CP and IVDDM yields of corn varieties were significantly decreased with the later dates of planting, but no varietal difference was found when planting was made at the same date. Average dry matter yields of corn varieties planted on April 20 and 30, and May 13 were 17,630, 15,945 and 13,300 ㎏/㏊, respecti- vely. Dry matter percentages of early maturing corn(DK 547) planted on April 20 and 30, and May 13 were 27.4, 27.5 and 24.8%, respectively, but those of medium(DK 729) and late(Pioneer 3160) maturing corns were decreased at greater rate, 20.9 to 24.7% regardless of earlier planting. Of the 27 different cropping systems of rye-corn, annual dry matter yields of 23 to 24t/ha obtained from three cropping systems (rye - Pioneer 3160 corn) harvested and planted on May 13, were significantly higher (P $lt;0.05) than the remaining 24 cropping systems producing 19 to 22 t/ha, but the quality of forages produced from the three cropping systems was the lowest one. Based on the results obtained in this experiment and on information now available regarding corn silage fermentation, it is considered that the double cropping system, such as early harvesting of early maturing variety of rye and early planting of early maturing variety of corn to be harvesed before the rainy season of autumn for silage, can be one of the recommendable forage production system in the north central area of Korea, if forage productivity and quality were equally emphasized.

수단그라스 , 수단그라스잡종 및 수수 - 수단그라스 잡종의 사초생산성 1 . 청예용 잡종의 비교

김동암,서성,이효원,임상훈,조무환,이무영 ( D . A . Kim,S . Seo,H . W . Lee,S . H . Lim,M . H . Jo,M . Y . Lee ) 한국축산학회 1982 한국축산학회지 Vol.24 No.2

수단그라스 , 수단그라스잡종 및 수수 - 수단그라스 잡종의 사초생산성 2 . 사일리지용 잡종의 비교

김동암,서성,이효원,임상훈,조무환,이무영 ( D . A . Kim,S . Seo,H . W . Lee,S . H . Lim,M . H . Jo,M . Y . Lee ) 한국축산학회 1982 한국축산학회지 Vol.24 No.2

In order to select higher yielding forage suited for silage, the yield performance and associated characteristics of 23 introduced sorghum-sudangrass hybrids (Sorghum bicolor (L.) Moench) have been evaluated at the Experimental Livestock Farm, COA, SNU, Suweon in 1979 and 1981. The results obtained are summarized as follows: 1. NK 367, Pioneer 931 and FS 24 gave significant highest forage yields than the control variety, Suweon 19 hybrid corn (P $lt; 0.05). There were no significant differences in forage yield between FS 4, FS 25A, T-E TDN, X 4318, Silo Milo and Suweon 19 hybrid corn, but these sorghum-sudangrass hybrids were the better forage producers. 2. Average grain percentages to the total forage yield of various hybrids tested ranged from 9.8% for FS 24 to 44.8% for FS 351 except NK 367. The grain percentages of FS 351 and Silo Milo were the highest and similar to that of Suweon 19 hybrid corn where 43.5% grain was obtained. 3. FS 251, NK 326 and FS lA headed and flowered early than other hybrids, while Pioneer 931, T-E TDN, X 4318 and Pioneer 944 showed later. NK 367 was the latest hybrid in maturity. 4. NK 367 and Pioneer 931 were found to be as tall type hybrids, while FS 251 and FS 351 appeared short types. Although no diseases and lodging were found in most hybrids, T-E Goldmaker was susceptible to leaf disease and SS IV gave severe lodging during the growing season. 5. The results indicated that Silo Milo, X 4318, FS 25A and T-E Silomaker have high silage yield potential with moderately high grain, and NK 367, Pioneer 931, FS 24, T-E TDN and FS 4 also have high yield potential with relatively low grain.

이동물체 탐지를 위한 Digital Radar 의 개발

신천우(C. W. SHIN),김태효(T. H. KIM),이무영(M. Y. LEE),정기호(K. H. JEONG) 대한전자공학회 1986 대한전자공학회 학술대회 Vol.1986 No.12

韓國産 天然水晶을 이용한 水晶共振子에 關한 硏究

李茂永,鄭基鎬,崔世崑 嶺南大學校 工業技術硏究所 1976 연구보고 Vol.4 No.1

韓國産 天然水晶은 寶石粧飾用으로서는 그 品質이 이미 알려져 있으나 水晶振動子로서의 特性에 관해서는 아직 報告된 바가 없다. 本 硏究는 特히 慶尙道一帶에서 採掘되고 있는 天然水晶을 採集, 選別, 加工하여 그 水晶振動子로서의 使用可能性을 實驗을 通하여 檢討한 것이다. 筆者들은 採掘現場近處에서 採集한 原石을 特別히 考案製作된 檢査鏡을 利用하여 分析選別하였으며 X-ray를 使用하여 AT-cut로 orientation 한후 試片을 切斷 하였다. 다음 腐蝕法을 適用하여 電氣的, 光學的 雙晶狀態를 檢討하고 다시 選別 하였다. Dimensioning은 5MHz를 目標로 하였는데 硏磨劑를 使用하여 5MHz의 粗度까지 硏磨하고 電極으로서 標準型의 銀膜을 烝着하여 試片을 完成하였다. 試片에 對한 測定結果는 모든 等價定數가 代表的인 輸入水晶片의 것과 對等하였으며 等히 Q는 모두 10 을 넘었다. 溫度特性도 AT-cut의 理論埴와 大差가 없었으며 -20℃~+100℃ 範圍에서 最大 20PPM 以內의 偏着을 보였다. 卽, 韓國産 天然水晶은 適切히 選別, 加工 한다면 優秀한 水晶振動子의 原料로서 使用할 수 있음이 證明되었다. Samples pf domestic natural quartz were collected and screened optically, and, chemically, and, after weeding out portions unfit for electrical resonator, were cut into AT-cut wafers, which in turn were dimensioned, trimmed and lapped into 5MHz resonator units. The eresults of measurements obtained form the specimens indicated excellent electrical chara-teristics of domestic natural quartz with the average Q guotient of 10 or higher. Temperature characteristics also showed typical AT-cut curves with the freruency deviation of 20PPM at maximum throughout the range of -20 to 100℃. The experiment on the initial batch of samples amply indicates the excellent electiical quality of domestic natural quartz as quartz resonator units.

3周波數 非同期 無線通信方式

李茂永,崔世崑 嶺南大學校 工業技術硏究所 1977 연구보고 Vol.5 No.1

주파수-시간분할 address를 사용하는 random access 통신방식은 산간오지등의 비상통신시설로서 적합한 여러가지 잇점을 지니고 있다. 본 논문은 이러한 목적에 가장 적합한 random access형 address를 사용한 간단한 비동기 광대역 무선통신방식을 제안한 것이다. 필자들은 비동기 delta 변조기와 부반송파의 첨가법을 병용하므로서 가입가능수를 최대한 증가시킬 수 있을 뿐 아니라 pulse 발사수를 감소시키므로서 S/N를 대폭 개선 할 수 있음을 이론적으로 증명하였다. 특히 model로서 3주파수 10시간 분할을 사용한 방식을 예를 들었는데 최대 216명이 임의로 상대를 선택 통화할 수 있으며, 77명이 S/N비 13dB 이상으로서 동시통화가 가능한 것이 예시되어 있다. In rural emergency communication, the simplicity is essencial as well as the flexiblity. In this paper, a simple random access radio communication system esecially designed for such purpose is introduced. By utilizing asynchronous delta modulation in conjunction with sub-carrier injection method, it is possible to reduce the error rate of the system and obtain substencial increase in subscriber capacity, with relativerly simple subscriber unit. After the theoritical analisis of the system, the auther introduces proposed model which provides 216 subscribers and allows 77 simultaneous conversation with the S/N of 13db or better over the descrete address consisted of 3 frequency and 10 time slot.