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中山間地(標高 250m)에서 참깨 播種適期와 晩播限界期에 關한 硏究
孫錫龍,崔仁植,趙鎭泰,權圭七,金仁培,李濟弘 충북대학교 농업과학기술연구소 1986 農業科學硏究 Vol.4 No.-
In order to determinate the optimum plating time and its limitation, an eary harvest and high yeld sesame varety-Poong Nyun Ggae-was cultivated on the semi-mountainous area of 250 meter above sea level. The variety was cultivated with a single and double cropping system. The single cropping plots were covered with transparent polyethylene film on 1st , 11th and 21th in May and the double cropping plots were covered with PE film on 5th, 15th, 25th in June respectively and on 5th July. The results obtained are as follows; Yield of the plot planted on 1st May was 59kg/10a. In compaorisn with this, yields were increased 16% and 25% in plots planted on 11th and 21th May, respectively. The optimum planting time was considered near 20th May for the single cropping system and it should be considered before 15th June for the double cropping system in the semimountainous area.
손석용,호광춘,김영권,Son, Seock-Yong,Ho, Kwang-Chun,Kim, Yung-Kwon 대한전자공학회 1999 電子工學會論文誌, D Vol.d36 No.11
최근, 유사 빔 전파방법이나 비 직교성 결합모드이론과 같은 다양한 근시적 해석법들이 중첩모드에 기초한 테이퍼 방향성 결합기의 그 광학적 특성을 분석하기 위하여 제안되어 왔다. 비록, 이들 접근 방식들이 특별한 구조에서 충분히 정확한 결과들을 제공하지만 테이퍼 전송 구조와 같은 민감한 광 소자 해석에는 불충분하다. 이를 위하여, 우리는 그 방향성 결합기의 전력전송을 정확하게 해석하기 위하여 새롭게 발전된 모드 전송선로, 해석법을 소개하고 이용하고자 한다. 이를 이용한 수치 해석 결과 대칭인 두 테이퍼 채널의 간격이 증가함에 따라 우/기 모드의 전파상수는 하나의 값으로 수렴하였다. 더욱이, 테이퍼 각도가 ${\theta}=0.1^{\circ}$일 때 하나의 전송 채널을 통하여 입사된 모드의 97%가 다른 전송 채널로 전송되었고, 그 기운 각도가 증가함에 따라 전력 전송은 현저하게 감소하였다. Recently, various simplified simulation techniques such as firite-difference beam propagation method and non-orthogonal coupled-mode theory have proposed to analyze the optical characteristics of tapered directional couplers supported by the coupling of two propagating modes. Although these approaches are often in sufficiently accurate, they do not provide the detailed solutions encountered in the analysis of tapered guiding structures. For this purpose, we introduce and utilize a newly developed modal transmission-line theory to analyze rigorously power transfer of the directional coupler. The numerical result reveals that the propagation constants of even and odd modes converge to a single value as increasing the spacer thickness between two symmetric tapered guides. Furthermore, 97% of the power incident into a guiding channel is transmitted to the other channel at the tapered angle ${\theta}=0.1^{\circ}$, and the efficiency of power transfer decreases dramatically as increasing the angle.
손석용,권기철,정택상 한국산림바이오에너지학회 2002 산림바이오에너지 Vol.21 No.1
경기도 광주군 태화산 서울대학교 중부연습림내 30년생 신갈나무 순림의 생산력을 조사하였다. 8본의 표본목을 흉고직경급별로 벌목하여, 각 층별 및 부위별 중량을 측정하고 생산구조를 조사한 결과를 요약하면 다음과 같다.<br/> (1) 신갈나무의 광합성부는 지상부 4m부터 시작되며, 수관의 최대광합성부는 10m를 전후해서 나타났다.<br/> (2) 지상부의 현존량은 줄기 51.262ton/ha(75.5%), 가지 13.148ton/ha(19.4%), 잎 3.476ton/ha (5.1%), 그리고 지상부 전체 건중량 67.886ton/ha로 나타났다.<br/> (3) 신갈나무 단순림의 연순생산량은 수간 5.624ton/ha/yr(44.07%), 가지 3.663ton/ha/yr (28.70%), 잎 3.4.76ton/ha/yr(27.23%), Wt 12.763ton/ha/yr로 나타났으며, 특히 가지와 잎의 비율이 큰 비중을 차지하는 것으로 나타났다.<br/> This study was to investigate the productivity of 30-year-old Quercus mongolica forest in the Experimental Forest of Seoul National University located in Mt. Taehwa, Kyonggi-do, Korea. Eight sample trees were selected and cut off. Stem, branches and leaves were weighed respectively with the stratified clipping method, and analyzed for productive structure.<br/> The allometric regression equations between dry weight of each component(stem, branches, and needles) and D2H were obtained. The results obtained are summarized as follows; (1) Photosynthetic layer of Quercus mongolica was shown at about 4m in height, and maximum needle amount of crown at 10m in height. (2) The total biomass of aboveground was 67.886ton/ha(75.5% from stem, 19.4% from branches and 5.1% from needles). (3) Annual net production of aboveground was 12.76ton/ha/yr, and the ratios of stem, branches and needles to that of aboveground, 44.1%, 28.7% and 27.2%, respectively.<br/>
孫錫龍,金鍾煥 충북대학교 농업과학기술연구소 1993 農業科學硏究 Vol.10 No.2
A study was conducted to clarify the effects of environmental factors on the emergence propagu-les in Sagittaria trifolia L. such as temperature, soil moisture, sowing depth, date of tuber collec-tion, storage and cutting conditions, and tuber dryness. The highest emergence percentage was 93% at 30℃ followed by 86% at 25℃ lower or higher temperature decreased the emergence rate. Sagittaria trifolia L. gave the highest emergence per-centage under submerged condition (3cm) . Increased sowing depth resulted in decreased rate of emergence and larger tuber showed higher emergence rate. The tuber of Sagittaria trifolia L. had dormancy until early November and was lower emergence ratio lower than 15% , however the tu-bers sampled later than December appeared to have passed dormancy breaking. Storage in sub-merged soil was observed to better than that in upland condition. The highest percentage of eme-rgence was obtained from tubers with glowing point. Drying tubers for 8-10 days reduced emer-gence ratio remarkably.