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Inoculation trials were conducted to determine the effect of difference in dry matter yield and growing status of alfalfa(Medicago sativa L.) plants in the field laboratory at the Kyung Hee University Campus from May to October in 1973. Inoculant(root nodule bacteria: Rhizobium meliloti) was applied at a rate to provide 6 oz/30 ℓ of alfalfa seeds. Five varieties of alfalfa such as Ranger, Atlantic, Vernal, Buffalo and Ladak were seeded on May 31, 1973 in a relatively shallow soil. These root nodule bacteria and alfalfa varieties were obtained from the United States of America, also varieties were developed from widely different soarces under a variety of climatic and soil conditions. Alfalfa plants were harvested when growth was permitted to reach about the one-tenth bloom stage. The plants were irrigated so moisutre was not limiting. There was a significant increase in yield due to inoculant application. Results of these preliminary trials indicate that dry matter yields and plant height from all inoculation treatment were significantly greater than the no inoculation treatments.
This study was carried out to establish the optimum ranges of soil physico-chemical improvement in corn fields. Soil physico-chemical properties and corn growth were investigated at different growth situations, soil depths and dates. The results obtained were summarized as follows: Growing degree days(GDD) of Suwon 19 variety of corn was 818.2℃. Solid and liquid phase percent of well growth fields were lower than poor growth, but air phase was higher. In well growth fields distributed ranges of three phase were 38-49% in solid, 8-27% in liquid and 24-53% in air phase by seasonal changes. Soil bulk denisty and hardness of well growth were lower than poor growth fields, those of that were higher in deeper depths. Soil pH were above 5.1 in the well growths. Organic matter was lower in the deeper depths and the latter growing stages. Cation exchange capacity of surface soil were higher than subsoil, but on differences during crop growing.
Cysticercosis of the central nerve system seldom involves spinal structures. When it does, the parasites grow much more often in the subarachnoid space than within the cord or epidural space. Recently we have experienced a cases of intramedullary cysticercosis in thoracic cord, which was characterized by paraparesis and voiding difficulty of 1½years duration in 34-year old man, and the patient's symptoms were improved after operation. We discuss this rare condition with brief review of the literature relevant to spinal cysticercosis.
Leluthia honshuensis Belokobylskij & Maeto, 2006 (Hymenoptera: Braconidae) was found as an ectoparasitoid of the first- and second-instar larvae of the Asian longhorned beetle (ALB), Anoplophora grabripennis (Motschulsky) (Coleoptera: Cerambycidae) from Gwangneung forest, Pocheon, Republic of Korea. This discovery was made during the investigation for parasitoids of ALB in 2016. We report here the first known host of Leluthia as the ALB. In addition, a diagnosis and detailed photographs of L. honshuensis are given. Images of the holotype specimen are also provided for comparison.
주가지수 옵션에 대한 많은 연구들에서 변동성 변화는 예측가능하다고 결론짓고 있다. 하지만 이러한 예측가능성이 경제적으로 유의적인가에 대해서는 결정적이지 못하다. 본 연구에서는 KOSPI 200 지수옵션의 조건부 변동성을 GARCH(1,1)모형과 내재변동성회귀(IVR)모형을 이용하여 예측하고, 이를 바탕으로 델타중립거래와 스트래들거래를 수행하였다. 연구 결과 변동성 예측성과 관련하여 IVR모형이 GARCH(1,1)모형보다 미래 변동성에 대한 증분 정보를 가짐을 발견하였고, 옵션시장의 정보 효율성과 관련하여 2002년 9월 12일부터 2003년 9월 8일 까지의 거래기간 동안 스트래들 거래전략에서 상당한 수익을 실현할 수 있었으며, 이는 거래기간동안 KOSPI 200 지수옵션 시장이 효율적이지 않았음을 의미한다. 하지만 비정상 수익의 대부분은 특정일에 기인한 결과이며 이 거래일을 제외할 경우 비정상 수익은 거의 사라졌으며 오히려 음의 수익을 실현하였다.
This study was conducted to establish the method of rapid propagation of Acanthopanax senticosus by cutting. Effects of five auxins on rooting for the cuttings were evaluated. Auxins, especially naphthaleneacetic acid (NAA), enhanced rooting rate only up to 30 days, but were not effective 60 days after cutting probably due to the relative slow rooting process of the cuttings. Commercially produced "Rooton F" was the only one showing positive effect in 60 days. Most of roots emerged from basal nodes of the cuttings. It was suggested that durability of exogenous auxin activity in powder form and preparation of cutting with buds could enhance the rooting.