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야생보리(Hordeum bulbosum)의 주요 특성 및 이를 이용한 보리 반수체육성
鄭東熙,閔庚洙,千鍾殷 韓國作物學會 1993 Korean journal of crop science Vol.38 No.6
Hordeum bulbosum에 의한 보리 반수체 이용육종은 단기간에 목적 형질을 고정하는 일반적인 이점 외에 세포학적으로 안정된 많은 반수체를 용이하게 얻을 수 있는 기능성이 있기 때문에 이 방법의 실용화을 제고하기 위한 방법을 체계화하기 위해 일년의 실험을 실시하였으며 우선, H. bulbosum의 여러 형질의 특성 및 재배종과의 교배시 유배형성율등을 조사하였다. H. bulbosum은 H. vulgare에 비하여 간이 가늘고 간장이 길며 세엽이나, 수장이 길고 수당영화수가 2배이상 많으며 수장개화일수가 3배이상 길었으며, H bulbosumrks에는 차이가 적었다. H. bulbosum중 4배체는 2배체에 비하여 유배형성율은 8%, 식물체 발생율은 2배이상 높으나 염색체의 일부가 완전히 소실되지 않으므로 보리의 반수체를 이용한 육종에는 활용할 수 없는 것으로 인정되었다. Bulbosum method, which haploids are developed by pollinating with H. bulbosum have been productive to be recommended as an effective method for the production of genetically stable normal barley hybrids. The purpose of this study is to investigate several characters of H. bulbosum, seed set and embryo development rate pollinated with H. bulbosum in order to establish a method for improvement of embryo development and to find conditions favoring plant development from the embryos cultured in vitro. Three lines of H. bulbosum used as pollinators: GBC(2~times ), Spenish diploid(2~times ) and var. Jaaska (4~times ) were morphologically similar, having characteristically narrow leaves, narrow and long culms, long spikes and anthesis duration in comparison with H. vulgare. H. bulbosum, var. Jaaska(4~times ) on being pollinated to barley cultivars, increased embryo formation by 8% and plant development in vitro by three times compared to the other diploid lines. the plants developed were not normal barley hybrids but had some H. bulbosum chromosomes uneliminated, indicating that the line was unstable as a pollinator to induce barley haploids.
FCAW에서 용접변수에 따른 용접금속 강도 및 와이어 합금원소의 회수율 변화
정동희,방국수,박찬,장웅성,박철규,Jung, Dong-Hee,Bang, Kook-Soo,Park, Chan,Chang, Woong-Sung,Park, Chul-Gyu 대한용접접합학회 2008 대한용접·접합학회지 Vol.26 No.2
590MPa grade weldable steels were gas metal arc welded with flux cored wires. Welding parameters such as current, voltage, and speed were varied independently. Effects of each parameter on the strength and chemical composition of weld metal were investigated. Increase of voltage caused decrease of weld metal tensile strength due to the low recovery of alloying elements such as carbon and manganese. On the contrary, increase of current and speed resulted in increase of weld metal strength because of higher recovery of the alloying elements.
정동희 대한영상의학회 1996 대한영상의학회지 Vol.34 No.4
Purpose : To describe chest radiographic and CT findings of silicosis, and to compare their findings. Materials and Methods : Ten coal miners and six stonemasons were included in this study. All were male and their mean age was 53.1. The mean duration of dust exposure was 15.2 years(range, 5-30 years) in coal miners and 25.3 years(range, 15-35 years) in stonemasons. Chest radiographs(n=16), conventional CT scans(n=4), and high resolution CT(HRCT) scans(n=13) were evaluated. Parenchymal abnormalities were interpreted on the basis of ILO standard films(1980) in chest radiographs and on the basis of CAP(College of American Pathologists, 1979) in CT(HRCT) films. Results : Chest radiographs revealed large opacities(n=8), small opacities(n=6), and normal findings(n=2). Type r(n=4) and category 1/1(n=2) were most common for small opacities, while for large opacities, category B(n=4)and category c(n=4) were most common. These small and large opacities were located predominantly in the area of the upper and middle lung. Associated findings were emphysema(n=7), eggshell nodal calcifications(n=3), pneumothorax(n=3), C-P angle blunting(n=4), and pleural thickening(n=1). CT scans revealed micronodules(n=16), nodules(n=3), and progressive massive fibrosis(PMF, n=8). All these lesions were located in the upper and middle lungs, especially in the central portion of the posterior lung. PMF showed diffuse and homogenous(n=3) and puntate(n=2) calcifications, cavitations(n=5), air bronchograms(n=3), and necrosis(n=1). Peripheral paracicatrical emphysema was associated with PMF(n=8). Other findings were pneumothorax(n=4), emphysema(n=10), hilar and mediastinal nodal enlargement(n=11), bronchial wall thick- enings(n=6), bronchiectasis(n=1), pleural thickening(n=7), parenchymal fibrosis(n=1), and pulmonary tuberculosis(n=2). Conclusion : Small and large opacities in chest radiographs and micronodules, nodules, and PMFs in CT(HRCT) films were located predominately in the upper and middle lungs, especially in the central portion of the posterior lung in CT films. CT was superior to plain chest radiographs in the following ways : (1) in the early detection of small opacities, including subpleural micronodules, and in the precise evaluation of their concentration and topography ; (2) in the detection of cavitation or calcification within conglomerate large opacity lesions ; (3) in the detection of hilar and mediastinal nodal enlargements ; and (4) in quantitative assessment of the severity of emphysema.
Ciceronianismo y el concepto de la imitación literaria en el Renacimiento español
정동희 서울대학교 라틴아메리카연구소 2015 이베로아메리카硏究 Vol.26 No.3
Resumen A pesar de que la imitación siempre ha ocupado el lugar más importante en la historia de la cultura occidental, en ninguna época se ha hablado tanto de la imitación como en el Renacimiento. Los humanistas, a fin de recuperar la pureza del latín clásico, toman a Cicerón como modelo único y sublime digno de imitar, considerándolo como ejemplo de lamejor latinidad. No obstante, algunos humanistas comoGasparino Barzizza, Angelo Poliziano, Pico dellaMirandolla y Erasmo insisten en el descubrimiento de unomismomediante la imitación de varios modelos en lugar de la imitación pegada al modelo ciceroniano. Es el enfrentamiento entre imitación simple e imitación compuesta. En cambio, los humanistas españoles nos muestran una diferente actitud respecto a la imitación. A pesar de que conozcan el ciceronianismo y las controversias sobre la imitación desarrolladas en Italia, en vez de dedicarse a la disputa teórica de la imitación, se enfocan en los aspectos retórico-pedagógicos de esta y centran su empeño en las finalidades prácticas del método. Los tratadistas españoles como Juan del Encina, Francisco Sánchez de las Brozas, Fernando de Herrera y Alonso López Pinciano consideran la imitación como una extensión del acto creativo convirtiéndola en una metodología de escribir para exponer su propio mundo. Although imitation has always occupied the most important place in the history of Western culture, at no time has it been much talked as in the Renaissance. The humanists, to recuperate the purity of classical Latin, adopt Cicero as the unique and sublime model worthy of imitation considering him as an example of the best latinity. However, some humanists such as Gasparino Barzizza, Angelo Poliziano, Pico della Mirandolla and Erasmus insist on discovering oneself by imitating various models instead of imitating only one model. The situation of Spanish Renaissance demonstrates the different aspect about the imitation. Although Spanish humanists know Ciceronianism and the controversies over imitation in Italy, rather than they engage in theoretical dispute of imitation, they focus on the rhetorical and pedagogical aspects of this and concentrate on the methodological application. Spanish writers such as Juan del Encina, Francisco Sánchez de las Brozas, Fernando de Herrera and Alonso López Pinciano consider imitation as an extension of the creative act and convert it into a writing methodology to present their own world.