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도입 청예맥류 Triticale 의 제주지역 적응성에 관한 연구
김문철,정창조 ( MOON CHUL KIM,CHANG CHO CHUNG ) 한국축산학회 1978 한국축산학회지 Vol.20 No.3
This experiment was carried out to evaluate the triticale as a green forage at the National University Livestock Research Farm, JEJU, during the period of October, 1976-September, 1977. The forage crops referred to are triticale, barley, wheat and Italian ryegrass. The results obtained are as follows: 1. In all cases, at maxium growth, forage crops mixed with hairy vetch gave better results than these grown separately. plant heights in order of merit, Italian ryegrass (140.5㎝), wheat(106.4㎝), triticale(102.9㎝) and barley(82.9㎝). 2. In the case of mixed treatments the botanical composition was changed from grass domination in early stages of growth to hairy vetch domination at advances growth and cutting times. 3. Total yield of freshly cut green forage material per 10a, Italian ryegrass(1.314㎏), wheat(530㎏), barley(433㎏), and triticale(423㎏). A high statistical significance was obtained in dry matter yield of the mixed treatments compared with the pure one (p$lt;0.01). There eras highly a significant difference between Italian ryegrass and the other species(p$lt;0.01). But no significant differences were found when the other species were compared with each other. 4. The nutritive value of forages was highest in the early stage of growth, and became progressively lower as the plants advanced in maturity. Forages which included vetch appeared to be higher in digestibility than these some sown singly, Italian ryegrass among the fewer species showed the highest digestibility coefficient.
제주 화산회토 목초지에서 질소 및 가리 시용 효과 : Ⅰ. Orchardgrass의 건물수량 및 무기물(N,P,L,Ca,Mg 및 Na) 함량
김문철 濟州大學校 農科大學 動物科學硏究所 1995 動物科學論叢 Vol.10 No.1
The experiment was carried out to determine the dry matter yield and the mineral contents of orchardgrass (Dactylis glomerata L.) grown in volcanic pasture treated with 5 different lebels of nitrogen and 2 different levels of potassium (5x2 split plot design). The dry matter yields were significantly increased with nitrogen application up to 200 kg/ha(p<0.05). but no effect was found with potassium(K) application. With increasing levels of nitrogen application, the concentrations of nitrogen(N) and sodium(Na) of orchardgrass were Iinearly increased but, phosphous(P) concentration was decreased(p<0.01). Significant differences were found in N, P, K, Mg and Na concentrations of orchardgrass between nitrogen application levels. and also in K, Ca, Mg, and Na concentrations between K application levels. There were significant seasonal variations in all elements determined (N, P, K, Ca, Mg and Na) (p<0.01). Comparison of seasonal variations of mineral contents between 0 and 200 kg K/ha showed that concen-trations of P, Mg, Ca and Na were higher with no K application than 200 kg/ha but the concenrration of K was higher with 200 kg K application than with no K application. The concentrations of K and P in May and June were higher than those in July and August. and the concentrations of K, Ca, and Mg uere higher in May and August than those in June and July. The concentration of Na was increased by June and was decreased thereafter. Results of this study indicate that at least 200 kp N/ha is needed to maximize the dry matter yields of orchardgrass grown in volcanic ash soil. The application of K 200 kg/ha did not improve the dry matter yields and appeared to be deleterious to the mineral nutrition of orchardgrass. especially, Mg. Ca and Na. as com-pared with no K application.
제주혼파초지에서 하고기 예취시기와 질소시비수준에 따른 목초생산의 계절적 변화
김문철,김영휘,조남기,이수일,이승협 濟州大學校 農科大學 動物科學硏究所 1993 動物科學論叢 Vol.8 No.1
To study management practices suitable for the least production loss of temperate pasture under summer stress. two different cutting dates (late June and mid July) under summer stress and five different nitrogen treatment application levels (0. 100. 200. 300 and 400 kg/ha) were tried during the trial period between Oct. of 1986 and Oct. of 1989. The late June cutting showed a statistically significant increase of dry matter yield of pasture in comparison with the mid-July cutting( P<0.05). Nitrogen application also gave significant increase in dry matter yield. Botanical composition at the 4th cuttings in 1988 and 1989 was dominated by weeds to the level of 50%. Application of nitro-gen at 200 kgs per ha was found to be the best with production of grasses at 70%. legumes at 10% and weeds at 20% in botanical composition comparison of pastures at the 4th cutting time the last year. showing a great decrease of weeds. K contents of pasture in June cuttings showed to be more than them in July cutting. and N and Na contents increased with increases of the nitrogen application level. It was concluded that treatment with June cutting and nitrogen application of 200kg per ha was a way to keep temperate pasture from summer stress in the Cheju area.
김문철,전영순,황문호 한국증권학회 2011 Asia-Pacific Journal of Financial Studies Vol.40 No.5
This study examines whether initial public offering (IPO) managers overstate accruals before insider selling in order to gain profits from insider selling, and whether accrual inflations that are motivated by insider selling are pronounced when information asymmetry between managers and outsiders is high and managers have higher incentives to manage earnings. Furthermore, the study examines whether managers employ real activities management in addition to accrual management, and whether managers choose accrual management over real activities management, and vice versa. The results reveal that discretionary accruals are significantly positive in the year of the IPO (year 0) and in the year immediately following the IPO (year +1). However, discretionary accruals in only year +1 are positively related to insider selling by chief executive officers (CEOs) in year +2. This is due to the lockup provision that prohibits the largest shareholders of IPO firms from selling their shares for 2 years from the date of the IPO. Our findings also show that the CEOs of IPO firms are more likely to inflate earnings before insider selling when information asymmetry is high and when their incentives for earnings overstatement are high. We find that IPO managers engage in real activities management in addition to accrual management to inflate earnings before insider selling. In addition, real activities management is observed only when the magnitude of accrual management is low, indicating that the CEOs of IPO firms engage in real activities management when they are not flexible to manage earnings through accrual management.
제주한우의 사양관리와 번식상황이 격년분만에 미치는 영향 2 . 제주한우의 사사기간 중 사료급여상황 및 우체중변화에 관한 조사연구
김문철,김중계,김승찬 ( Monn chul Kim,Jung Key Kim,Seung chan Kim ) 한국축산학회 1985 한국축산학회지 Vol.27 No.4
To investigate the effect of giving different feeds, during the winter, 412 Cheju native and cross bred cows and heifers housed in villages were studied. 1. Results showed no appreciable difference amongst the 5 villages feeding different foods during the winter period. Percentage of farms feeding various brans, over 1㎏ per day, was 4.8%; a small quantity (0.5㎏) of various brans was fed daily to 46.6% and those feeding only natural hay, 48.6% 2. The number of villages feeding various braes is increasing and those feeding hay decreasing. Cattle weights decreased by 20-30㎏ monthly per head during the winter feeding period (Jan: Apr.) but by May increased in the range of 10-20㎏ per head with arrival of the new grass. 3. Comparison of monthly body weight changes of Cheju native cows and cross breds, Brahman cross breds showed the least body weight changes during winter while native and Santa cross bred cows the weight changes were considerable.
Al-Mm-Ni 계 비정질합금의 미세조직과 기계적 특성
김문철,박찬경,안병용,윤길수 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.8
The objectives of this study are firstly to find optimum fabrication condition of the high strength Al-Mm(misch metal)-Ni and Al-Mm-Ni-Fe amorphous alloys made by a single roll melt-spinner in air and vacuum, and secondly to investigate the correlation of the mechanical properties and microstructure of the alloys. Alloys containing about 4 at.% Mm and 10 at.% Ni content revealed uniform amorphous phase, and showed high fracture strength. Among these alloys Al_(86)-Mm₄-Ni_8-Fe₂ alloy, melt-spun in vacuum, showed the highest fracture strength of about 850MPa. Meltspun Al_(86)-Mm₄-Ni_(10) amorphous alloy showed two-stage crystallization from amorphous to amorphous matrix phase with fcc-Al particles, and then to amorphous matrix phase containing intermetallic compounds. As annealing temperature increased, fracture strength and elongation decreased in the range up to about 350℃, and then increased again. The decrease in fracture strength seems to be caused by a decrease of free volume of amorphous phase by the structural relaxation before the formation of fcc-Al particles, in conjunction with an enhancement of embrittlement after formation of fcc-Al particles. The replacement of Ni content by 2 at.% of Fe in Al_(86)-Mm₄-Ni_(10) alloy resulted in an increase of both thermal stability and the mechanical properties. This can be explained in terms of increased attractive bonding force among the constituent atoms by the replacement of Fe.