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I-SSR 標識子를 利用한 호도나무屬의 識別 및 類緣關係 分析
黃錫仁,曺炅眞,李文鎬,李在善,李炳實,李郁 한국임학회 2004 한국산림과학회지 Vol.93 No.7
DNA 표지자를 이용한 호도나무 품종의 유연관계 및 품종구분을 위하여 I-SSR 9개 표지를 이용하여 104개의 유의적인 표지가 얻어졌으며, 신품종 호도나무를 포함한 83개 국내외 품종(종)에 대해 DNA 지문에 의한 품종식별이 가능하였다. 수원 1호, 수원 2호, 왕호도는 모두 Conrord, McKinster 등 미국에서 도입된 대립성 품종과의 인공교배로 육성된 품종으로 유전적 유연관계가 상촌 4호 등 국내 선발종보다는 산성 4호×Concord의 교배종과 더 가까웠다. 국내 선발종 호도나무인 상촌 2호, 상촌 4호 및 산성 4호 이들 끼리 한 그룹을 이루고 있는데 이는 국내의 호도나무가 외국품종과 구분되는 유전적 동질성이 있음을 보여주었다. 영동은 개체선발로 육성되었으나 외국종과 교배에 의하여 육성된 교잡종들과 같은 무리에 속하였는데, 이는 영동 품종은 외국 품종의 교배에 의해 외래 유전자 일부가 유입된 것이 아닌가 추정된다. Concord×상촌 1호., Concord×상촌 2호, Concord×대부 1호가 한 무리를 이루었고 Lake×상촌 2호가 이들과 구분되는 것은 교배차대가 유전적으로 화분수보다는 모수의 영향을 더 많이 받고 있음을 보여준다. Using 104 fragments amplified from 9 I-SSR primers, a total of 83 cultivars in Juglans spp. including new cultivars used for the present study were identified. The new cultivars 'Suwon No.1', 'Suwon No.2', and 'Wanghodo' are hybrids between the domestic cultivars and the introduced cultivars such as 'Concord' and 'McKinster' bearing big nuts. Consequently, these cultivars were closer to the hybrid between 'Sansung 4×Concord' than to domestically selected cultivars such as 'Sangehon 4' from the viewpoint of genetic relationship. The domestic cultivars such as 'Sangchon 2', 'Sangchon 4', and 'Sansung 4' belonged to the same group and were genetically distinctive from the introduced cultivars. This suggests that there would be difference in genetic structure between the domestic and the introduced cultivars. The cultivar 'Yeongdong' was clustered into the group of hybrids between the domestic and the introduced cultivars although it was developed by the selection of a tree from a domestic population. This might be because the genes were introduced from the introduced cultivars into the domestic population via open-pollination. The 'Concordx×Sangchon 1', 'Concord×Sangchon 2', and 'Concord×Daebu 1' were Clustered into the same group whereas 'Lake×Sangchon 2' was clustered into the different group. This ndicates that the genetic characteristics of hybrids may be influence more strongly by the mother tree than by the father tree.
Cho, Byoung-Uk,Park, Dong-Soo,Park, Hong-Chae The Korean Ceramic Society 2002 한국세라믹학회지 Vol.39 No.7
Multi-layer composites consisting of silicon nitride, silicon nitride-silicon carbide and boron nitride-alumina layers were prepared fly stacking the corresponding ceramic tapes. The composites demonstrated self-diagnostic capability and non-catastrophic failure behavior. The composites consisting of many thin layers exhibited high strength and stepwise increase of the electrical resistance during the flexure test. The strength of the composite with too thick silicon nitride layers was low and the electrical resistance was abruptly increased to the detection limit of the digital multi-meter during the test. An extensive crack branching was observed in the weak (BN + Al$_2$O$_3$)layer.
Modeling and simulation of separation process in flotation system
Byoung-Uk Cho,Jeong-Yong Ryu,Bong-Keun Song 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.2
In order to design a flotation circuit to remove ink and contaminants from slushed old corrugated container (OCC) pulp suspension, a model based on mass balance was developed. The model is a five fractional model, which handles mass flow rate of ink, fiber, fines, filler and dichloromethane (DCM) extractives. A detailed method of calculating the deinking selectivity of a material from experimental data, described in terms of reject ratio, is presented. Three flotation deinking systems were simulated. In a single stage flotation system, increasing the number of flotation cells improved cleanness of the accept pulp suspension while it decreased yield at the same time. Yield can be increased by adding a second stage and by introducing the accept flow of the second stage into the feed flow of the first stage. However, the cleanness of the accept pulp was deteriorated. It was shown that yield can be increased without compensating the cleanness of the accept pulp by utilizing the accept pulp from the second stage for another paper machine line instead of sending back to the feed flow of the first stage. Crown Copyright 2009 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry. All rights reserved.
A deposition efficiency model for fiber–filler flocculation by microparticle retention system
Byoung-Uk Cho,Gil Garnier,Theo G.M. van de Ven,Michel Perrier 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.2
A deposition efficiency model was developed in order to predict the effect of the dosage of retention aids (polymer and bentonite) on filler retention and validated with a pilot machine trial. The deposition efficiency is a function of the surface coverage of adsorbed and transferred polymer on solids (fiber and filler) and the surface coverage of microparticles on the polymer-adsorbed layer. The model includes the effect of bimodal particles (i.e., fiber and filler) and the polymer transfer from fiber to filler. In addition, the interaction between bare surfaces was included in the model and different bond strength of each interaction was considered. It was shown that an increase in the deposition efficiency leads to an increase in the filler retention. The dosage of CPAM is more predominant variable affecting deposition efficiency and thus filler retention than that of bentonite. Crown Copyright 2009 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry. All rights reserved.