돼지 질병방제 : 문제점과 대책

이창구,Lee Chang-Koo 대한수의사회 1979 대한수의사회지 Vol.15 No.3

Chinese Mathematics in Chosun

이창구,홍성사,Lee, Chang Koo,Hong, Sung Sa The Korean Society for History of Mathematics 2013 Journal for history of mathematics Vol.26 No.1

중국 수학을 토대로 조선 수학이 발전된 것은 잘 알려져 있다. 이 논문에서는 조선에 유입된 중국 산서의 역사를 조사하여 중국 수학이 조선 수학에 끼친 영향을 연구한다. 15세기 세종(世宗)대에 들어온 중국 수학, 17세기 서양 수학의 영향을 받은 중국 수학과 19세기 중국에서 재정리된 송, 원대의 수학으로 나누어 이들이 유입되는 과정도 함께 조사한다. It is well known that the development of mathematics in eastern Asia was based on Chinese mathematics. Investigating Chinese mathematics books that were brought into Chosun, we study how Chinese mathematics influenced Chosun mathematics. Chinese mathematics books were brought into Chosun in three stages, namely basic mathematics books in the era of King SeJong(1397-1450), Chinese mathematics books influenced by western mathematics in the 17th century and finally those with commentaries on mathematics of Song-Yuan era in the 19th century. We also study the process of their importations.

절수(節水)의 시기(時期) 및 방법(方法)의 차이(差異)가 수도생육(水稻生育) 수량(收量)과 기타(其他) 실용형질(實用形質)에 미치는 영향(影響)

이창구 ( Lee Chang Koo ) 한국농공학회 1968 韓國農工學會誌 : 전원과 자원 Vol.10 No.2

Higher yield in rice paddies is greatly dependent on adequately balanced and timely supply of water. A majority of rice paddy in Korea is generally irrigated by rainfall, but in many cases it has to be supplemented by artificial irrigation for optimum rice culture. Although the water requirement of rice plant is far higher than that of other crops, submerged condition of rice paddy is not necessarily required. The moisture requirement of rice plant varies with its growing stages, and it is possible to increase the irrigation efficiency through reduction of water loss due to percolation in rice paddies. An experiment was conducted on the effectiveness of economical use of water by different irrigation period and different method of cultivation. The experimental plots were set up by means of randomized block design with three duplications; (a) Alltime submerged (b) Economically controlled, and (c) Extremely controlled. Three different irrigation periods were (a) Initial stage (b) Inter-stage, and (c) last stage. The topsoil of the three plots were excavated to the depth of 30cm and then compacted with clay of 6 cm thickness. Thereafter, they were piled up with the excavated top soils, leveled and cored with clay of 6cm thickeness arround footpath in order to prevent leakage. The results obtained frome the experiments are as follows; (1) There is no difference among the three experiment plots in terms of physical and chemical contditions, soil properties, and other characteristics. (2) Colulm length and ear length are not affected by different irrigation methods. (3) There is no difference in the mature rate and grain weight of rice for the three plots. (4) The control plot which was irrigated every three days shows an increased yield over the all the time submerged plot by 17 persent. (5) The clay lined plot whose water holding capacity was held days long, needs only to be irrigated every 7 days. (6) The clay lined plot showes an increased yield over the untreated plot; over all the time submerged plot by 18 percent, extremely controlled plot by 18 percent, and economically controlled plot by 33 percent.

조선 중기 보조禪의 영향 - 서산을 중심으로 -

이창구(Lee Chang-Koo) 보조사상연구원 2004 보조사상 Vol.21 No.-

This paper discusses the influence of Bojo Chinul(知訥)'s Zen Thought in the Middle Period of Choseon Dynasty, through Seosan(西山)'s Zen thought. Chinul's Zen thought have had much influences on Seosan. In this paper, I will discuss the influence in terms of three subjects, or Sudden Awakening & Gradual Practicing(頓悟漸修), Unit between Seon & Gyo(禪敎會通), Ganhwa-Seon(看話禪). At first, Seosan has succeeded to the Sudden Awakening & Gradual Practicing thought of Chinul. In Seosan, It is a moment of Sudden Awakening when we clearly enlighten True Mind is Buddha. His understanding on Sudden Awakening is the same that of Chinul. Like Chinul, he has believed that we need to practice gradually after Sudden Awakening. Second, Seosan has succeeded to Chinul's thought of Unit between Seon & Gyo. Similar to Chinul, Seosan has believed that Seon is Buddha's Mind, Gyo is Buddha's Word. Third, Seosan has deepened the thought of Ganhwa-Seon, which is introduced by Chinul. He also has believed that we don't have to practice Hwa-Doo(話頭) without the right understanding on Mind.

한개용수량(漢槪用水量)의 수리적(水理的) 측정장치(測定裝置)에 관(關)한 실험(實驗)

이창구 ( Chang Koo Lee ),유한열 ( Han Yeol Ryu ),이상명 ( Sang Myung Lee ) 한국농공학회 1965 韓國農工學會誌 : 전원과 자원 Vol.7 No.1

The purpose of this paper is to study hydraulic devices to measure irrigation water. Those devices should be simple and inexpensive to make and operate. Sharp-edged weirs were mainly made of wooden planks and they are portable. A Ventri flume was also made of wooden planks that was painted with coal tar. Two stilling wells with scales on their walls to measure heads were attached to it, A cylinder-propeller flow meter was newly designed and made. It has a gear mechanism and a propeller in a 4-inch cylinder. It was rated under the condition of free outflow. This device will be useful to measure a definite quantity of irrigation water, automatically [closing its gate after passing the necessary quantity of water through it.

출력궤환 폐루프 극 이동에 의한 제어계 설계 기법

李昌求(Chang-Koo Lee),黃炯秀(Hyoung-Soo Hwang),金聖中(Sung-Joong Kim) 대한전기학회 1987 전기학회논문지 Vol.36 No.3

원저 : 쥐에서 반복적인 금식과 재식이에 따른 체중 감소의 기전

이창구 ( Chang Koo Lee ),김용운 ( Yong Woon Kim ) 대한비만학회 2005 The Korean journal of obesity Vol.14 No.1

연구배경: 생체는 내외 환경의 변화에 따라 적절하게 에너지 소비와 섭취에 관련된 조절기전들을 사용하여 체지방을 조절하게 된다. 신체는 절식상태에 대하여 에너지 소비를 줄여 에너지를 보존하려는 반응을 나타내며 고지방식이와 같이 에너지 과잉상태에는 에너지 소비를 증가시키고 식욕을 억제하는 반응을 나타내게 된다. 절식이 장기간 계속되거나 반복되면 조직에서 에너지를 보존하려는 반응이 증가하게 되어 요요현상이 초래되기도 한다. 본 연구에서는 신체가 반복적인 금식 Background: It is known that repeated fasting and refeeding increase capacity of fat storage in adipose tissue as an adaptive response to fasting. However, the amount of weight gain in fasted/refed animals falls behind the control level in most rodent stu

국내 신재생에너지기술개발 현황 및 정책동향

이창구(Lee, Chang-Koo),안종득(Ahn, Jong-Deuk),김희정(Kim, Hee-Jeong),조용희(Cho, Yong-Hee) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11

최근 전세계적으로 신재생에너지에 대한 관심과 투자가 증폭되고 있으며, 우리나라에서도 그 간의 지속적인 연구개발 지원에 힘입어 국산기술 확보 및 산업화가 점차적으로 이루어지고 있는 것으로 분석되고 있다. 더욱이 신정부에서는 국정지표인 녹생성장의 실현방안으로 신재생에너지에 대한 지원을 대폭 확대하고 있어 관련 기술개발 투자도 지속적으로 확대될 것으로 보인다. 본 고에서는 이러한 국내 신재생에너지 기술개발 관련 정책 및 기술개발 동향에 대하여 알아보고, 특히 급속한 성장세 속에 2008년 전세계 태양전지생산량이 7.9GW1) 에 달한 태양광 분야는 우리나라가 강점을 갖고 있는 반도체, LCD 기술과 유사하여 국내의 축적된 기술과 인프라를 활용할 경우 조기에 세계수준의 기술력을 확보할 것으로 기대되고 있으며, 정부에서는 태양광 분야를 수출전략산업화 하기위해 집중적인 투자에 나서고 있다. 이러한 상황에서 그간의 기술개발 현황, 실적 및 향후 전망 등에 대하여 살펴보고자 한다.

논문 : 진심(眞心)과 오수(悟修)의 구조 - 『진심직설』을 중심으로 -

이창구 ( Chang Koo Lee ) 한국동서철학회 2005 동서철학연구 Vol.36 No.-

관개조절(灌漑調節)의 몇가지 방식(方式)이 수도(水稻)의 생육(生育) 및 수량(收量)과 관개수절약(灌漑水節約)에 미치는 영향(影響)에 관(關)한 연구(硏究)

이창구 ( Chang Koo Lee ) 한국농공학회 1971 韓國農工學會誌 : 전원과 자원 Vol.13 No.3

The studies were conducted to determine the methods of irrigation control which is not only able to save the irrigation water as a adaptable measures for the insufficient irrigation water and the drought but also increase the yields of rice, in the paddy field which shows over percolating tendency through the couple years of 1968 and 1969 at Suwon. These experiments were carried with late maturing rice variety, Norim No. 6 and the major treatments in this experiments were filling the clay under surface soil, periodic irrigation and lining the Vinyl under the surface soil and three replicated completely randomized design was employed. Results obtained will be summarzed as follows. 1. Through the couple years, the plots tilled the clay under 15cm of the surface soil saved the irrigation water by 364% to 45% and 78% to 88% respectively. Particulary, the plot of filling the clay with 9cm thick under 15cm of the surface soil, saved the amount of irrigation water by 45% to 88% and also increased yields by 12% to 20% through the couple years. 2. The plots in which amount of 40mm of irrigation water is irrigated periodically from 5 to 8 days at the stages of tillering and ripening, saved theamount of irrigation water by 41% to 55% and also increased yields by 10% to 16% respectively through the couple years. 3. The plot lined the Vinyl under 15cm of the surface soil, saved the amount of irrigation water by 75% to 88% in accordance with the size of hole. The plot of lining the Vinyl with 3cm/㎡ hole yielded almost same as the check plot, but in the case of lesser hole than above yielded less. 4. The plots inserted the Vinyl paper in 57cm depth and with 6cm height from the soil surface around the plot to prevent the ridge percolation reduced the amount of percolation by 25% to 33%. 5. The plot filled the wheat straw with 6cm thick under 15cm of the surface soil increased yields by 30% in former year but opposite results were gained in later year. 6. Generally, yields and yield components such as number of spikes of spikes per hill and number of grains per spike were decreased in 1969. These faots are considered to depend upon the rainy and cold weather in the stages of vigorous tillering and less sunshine in the stages of ripening. 7. The variation of characters among the plots will be summarized as follows. (1) Tallerplant height was found in the plots of clay filling and irrigation control. (2) longer culm length and higher yields were founds in the plots filled the clay with 9cm thick and controled the irrigation periodically froir 7 to 8 days. (3) Length of spike increased generally with yields but opposite tendency was found also. (4) Number of spikes per hill increased with yields in the plots of irrigation control. (5) Number of grains per spike increased with yields in the plots filled the clay with 9cm thick and controled irrigation periodically from 5 to 8 days. (6) Tendency of variation of 1000 grain weight is similar to Number of grains per spike. (7) Percentage of complete grains increased in the plot of clay filling and irrigation control.