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Hyosig Won 한국식물학회 2009 Journal of Plant Biology Vol.52 No.5
Recent phylogenetic research suggests that Malvaceae s.l. comprises formerly Tiliaceae, Byttneriaceae, Bombacaceae, and Sterculiaceae. Corchoropsis is traditionally included in Tiliaceae or Sterculiaceae and is distributed in China, Korea, and Japan. One to three species have been recognized for this genus. Phylogenetic relationships among the Malvacean taxa have been intensively studied with molecular data, and the evolution of their morphological characteristics has been reinterpreted accordingly. However, no Corchoropsis species have been included for their phylogenetic position. Here, three chloroplast coding regions—rbcL, atpB, and ndhF, from Corchoropsis psilocarpa and Corchoropsis crenata—were amplified and sequenced, then compared with other Malvacean taxa. This analysis of the three plastid gene sequences now places Corchoropsis species in Dombeyoideae, as previously proposed by Takeda (Bull Misc Inform Kew 365, 1912), Tang (Cathaya 4:131–150, 1992), and Bayer and Kubitzki (2003). Within Dombeyoideae, Corchoropsis forms a strongly supported sister relationship with the Dombeya–Ruizia clade.
Random Forest Model for Silicon-to-SPICE Gap and FinFET Design Attribute Identification
Hyosig Won,Katsuhiro Shimazu 대한전자공학회 2016 IEIE Transactions on Smart Processing & Computing Vol.5 No.5
We propose a novel application of random forest, a machine learning–based general classification algorithm, to analyze the influence of design attributes on the silicon-to-SPICE (S2S) gap. To improve modeling accuracy, we introduce magnification of learning data as well as randomization for the counting of design attributes to be used for each tree in the forest. From the automatically generated decision trees, we can extract the so-called importance and impact indices, which identify the most significant design attributes determining the S2S gap. We apply the proposed method to actual silicon data, and observe that the identified design attributes show a clear trend in the S2S gap. We finally unveil 10nm key fin-shaped field effect transistor (FinFET) structures that result in a large S2S gap using the measurement data from 10nm test vehicles specialized for model-hardware correlation.
Won, Hyosig,Yun, Young-Eun,Kwak, Myounghai,Han, Jeong Eun The National Institute of Biological Resources 2012 Journal of species research Vol.1 No.2
To assess the genetic diversity of Aconitum coreanum (Ranunculaceae) populations in Korea, we have amplified and sequenced eight organellar marker regions, and developed and analyzed microsatellite markers. No sequence variation was detected from the eight organellar markers. Ten microsatellites were developed using Next Generation Sequencing and two microsatellite markers, AK_CA03 and AK_CT07, were identified polymorphic and applied for 143 individuals of twelve A. coreanum populations. Four and five alleles were detected for the two microsatellite loci, respectively, and number of migrants ($N_m$) was estimated as 1.12586. Two microsatellite marker loci showed $F_{ST}$ of 0.205 and 0.275, respectively. The heterozygosity deficit, low level of among-population differentiation, small size of gene flow, and lack of sequence variation of the organellar markers suggest that A. coreanum is reproductively isolated from other Aconitum species and there has been continuous gene flow among the populations of A. coreanum or it has dispersed relatively recently after speciation. Though population pairwise $F_{ST}$'s presented significant geographic structure, further sampling and study will be necessary to confirm this.
구조기구조기인 아이들 소음 저감을 위한 차체 골격 내 복합체 삽입 최적설계
김효식(Hyosig Kim),윤성호(Seongho Yoon),김중희(Joonghee Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
As a matter of fact, it has been difficult to modify the shape of vehicle body skeletons since the technical definition for a global body structure was fixed and the corresponding molds were developed. By the way, if it is available to apply an alternative to reinforce the skeletons without changing their molds, it will be more flexible to improve the performance qualities relevant to crash, durability and NVH(Noise, Vibration and Harshness). Recently, a solution with the composite body becomes available for the purpose. We present an optimal design method to insert the composite bodies into a vehicle body skeleton in order to improve the structure-borne noise at the idle condition. The algorithms, topology optimization and gradient based optimization, are applied to mainly search the sensitive structural joints in the body skeleton and to extract the technical definition of composite body insertions. Inserting the composite bodies into the sensitive joints, it is predicted to achieve the countermeasure which can meet the design availability in terms of the idle noise and the weight. According to the validation result with test vehicles, the concerned noise transfer function is reduced and the idle booming noise is resultantly improved.
충돌 안정성, 소음진동 및 내구의 다분야 통합 최적설계를 이용한 차체구조의 경량화
김효식(Hyosig Kim),인준교(Junkyo In) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.4
This paper presents a study on the multidisciplinary design optimization compromising Crashworthiness, NVH and Durability for weight reduction of a vehicle body structure. The objective function is the weight of the body structure. The design constraints are selected from the major performance responses from NVH, Crashworthiness and Durability. And the design variables consisted of three categories: panel thicknesses, material grades and presence/absence of structural parts. NVH performance is estimated with two kinds of computational models: BIW(Body in White) and BIG(Body in Grey: Semi full vehicle). In case of BIW, two fundamental modal frequencies of 1st torsional and 1st bending modes are traced. In case of BIG, total 32 IPI(Input Point Inertance) at the body mountings are investigated and total 58 VTF(Vibration Transfer Function) of panels encompassing the acoustic cavity are studied. The targets of these NVH related responses have been deployed from the vibro-acoustic standard. CRASH requirement is investigated with 3 kinds of crash protocols: Frontal crashworthiness: BFD(Frontal Deformable Barrier) and 2 side ones: AEMDB of KNCAP and ENCAP. DURABILITY criteria is investigated with not only fatigue damages of structural panels but also failures of spotwelds. To find the optimal design candidates, this study adopts the meta-models using RSM(Response Surface Model) which are obtained through DOE(Design of Experiments). And then Genetic algorithm is used to search out the global minimums with the metamodels. This study finds a few configurations that can save the weight of the selected parts from 4.9 % up to 10.3 % of the baseline design. The proposed configuration presents a satisfactory compromise between the performances and weight reduction, although it is complicated to gain a balance because they are more contradictory under the modern Paradigem: front-loading design and reduction of development time.