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Pricing options with credit risk in a reduced form model
Xiaonan Su,Wensheng Wang 한국통계학회 2012 Journal of the Korean Statistical Society Vol.41 No.4
This article investigates the valuation of European option with credit risk in a reduced form model. We assume that the interest rate follows the Vasicek model and the intensity of default is driven by a jump diffusion process. We obtain the closed form formula for the price of the option and provide some numerical illustrations of the results obtained.
Xiaonan Li,Wenxing Pang,Su Ryun Choi,Yong Pyo Lim 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07
We investigated the genetic diversity and structure of the 239 fixed lines with 47 simple sequence repeat (SSR) and 109 NGS-generated SNP markers evenly distributed in B. rapa genome. Phylogenetic analysis classified the vegetable fixed lines to four subgroups, with the three types forming a separate and relatively farther cluster. Population structure analysis identified four sub-populations corresponding to geographic origin and morphological traits, and revealed extensive admixture. The vegetable B. rapa fixed lines successfully developed in our study would be valuable materials for multinational B. rapa diversity resources establishment. Understanding the genetic diversity and population structure could be useful for utilization of the representing genetic variation and further genetic and genomic analysis.
Pricing options with credit risk in a reduced form model
Su, Xiaonan,Wang, Wensheng 한국통계학회 2012 Journal of the Korean Statistical Society Vol.41 No.4
This article investigates the valuation of European option with credit risk in a reduced form model. We assume that the interest rate follows the Vasicek model and the intensity of default is driven by a jump diffusion process. We obtain the closed form formula for the price of the option and provide some numerical illustrations of the results obtained.
Li, Xiaonan,Ramchiary, Nirala,Dhandapani, Vignesh,Choi, Su Ryun,Hur, Yoonkang,Nou, Ill-Sup,Yoon, Moo Kyoung,Lim, Yong Pyo Oxford University Press 2013 DNA research Vol.20 No.1
<P><I>Brassica rapa</I> is an important crop species that produces vegetables, oilseed, and fodder. Although many studies reported quantitative trait loci (QTL) mapping, the genes governing most of its economically important traits are still unknown. In this study, we report QTL mapping for morphological and yield component traits in <I>B. rapa</I> and comparative map alignment between <I>B. rapa</I>, <I>B. napus</I>, <I>B. juncea</I>, and <I>Arabidopsis thaliana</I> to identify candidate genes and conserved QTL blocks between them. A total of 95 QTL were identified in different crucifer blocks of the <I>B. rapa</I> genome. Through synteny analysis with <I>A. thaliana</I>, <I>B. rapa</I> candidate genes and intronic and exonic single nucleotide polymorphisms in the parental lines were detected from whole genome resequenced data, a few of which were validated by mapping them to the QTL regions. Semi-quantitative reverse transcriptase PCR analysis showed differences in the expression levels of a few genes in parental lines. Comparative mapping identified five key major evolutionarily conserved crucifer blocks (R, J, F, E, and W) harbouring QTL for morphological and yield components traits between the A, B, and C subgenomes of <I>B. rapa</I>, <I>B. juncea</I>, and <I>B. napus</I>. The information of the identified candidate genes could be used for breeding <I>B. rapa</I> and other related <I>Brassica</I> species.</P>
Mapping QTLs of resistance to head splitting in cabbage (Brassica oleracea L. var. capitata L.)
Wenxing Pang,Xiaonan Li,Seong Ho Lee,Dasom Kim,Sang Heon Oh,Su Ryun Choi,Yong Pyo Lim 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
Cabbage head splitting can greatly affect both the quality and commercial value of cabbage (Brassica oleracea). To detect the genetic basis of head-splitting resistance, a genetic map was constructed using an F2 population derived by crossing “748” (head-splitting-resistant inbred line) and “747” (head-splitting-susceptible inbred line). The map spans 830.9cM and comprises 270 markers distributed in nine linkage groups, which correspond to the nine chromosomes of B. oleracea. The average distance between adjacent markers was 3.6cM. A total of six quantitative trait loci (QTLs) conferring resistance to head splittingwere detected in chromosome 2, 4, and 6. Two QTLs, SPL-2-1 and SPL-4-1, on chromosomes 2 and 4, respectively, were detected in the experiments over 2 years, suggesting that these two potential loci were important for governing the head-splitting resistance trait. Markers BRPGM0676 and BRMS137, which were tightly linked with head-splitting resistance, were detected in the conserved QTL SPL-2-1 region using bulked segregant analysis. Synteny analysis showed that SPL-2-1 was anchored to a 3.18Mb genomic region of the B. oleracea genome, homologous to crucifer ancestral karyotype E block in chromosome 1 of Arabidopsis thaliana. Moreover, using a field emission scanning electron microscope, significant differences were observed between the two parental lines in terms of cell structures. Line “747” had thinner cell wall, lower cell density, larger cell size, and anomalous cell wall structure compared with the resistant line “748”. The different cell structures can provide a cytological base for assessing cabbage head splitting.