Probabilistic assessment on the basis of interval data

Thacker, Ben H.,Huyse, Luc J. Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.25 No.3

Uncertainties enter a complex analysis from a variety of sources: variability, lack of data, human errors, model simplification and lack of understanding of the underlying physics. However, for many important engineering applications insufficient data are available to justify the choice of a particular probability density function (PDF). Sometimes the only data available are in the form of interval estimates which represent, often conflicting, expert opinion. In this paper we demonstrate that Bayesian estimation techniques can successfully be used in applications where only vague interval measurements are available. The proposed approach is intended to fit within a probabilistic framework, which is established and widely accepted. To circumvent the problem of selecting a specific PDF when only little or vague data are available, a hierarchical model of a continuous family of PDF's is used. The classical Bayesian estimation methods are expanded to make use of imprecise interval data. Each of the expert opinions (interval data) are interpreted as random interval samples of a parent PDF. Consequently, a partial conflict between experts is automatically accounted for through the likelihood function.

Probabilistic assessment on the basis of interval data

Ben H. Thacker,Luc J. Huyse 국제구조공학회 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.25 No.3

Uncertainties enter a complex analysis from a variety of sources: variability, lack of data, human errors, model simplification and lack of understanding of the underlying physics. However, for many important engineering applications insufficient data are available to justify the choice of a particular probability density function (PDF). Sometimes the only data available are in the form of interval estimates which represent, often conflicting, expert opinion. In this paper we demonstrate that Bayesian estimation techniques can successfully be used in applications where only vague interval measurements are available. The proposed approach is intended to fit within a probabilistic framework, which is established and widely accepted. To circumvent the problem of selecting a specific PDF when only little or vague data are available, a hierarchical model of a continuous family of PDF’s is used. The classical Bayesian estimation methods are expanded to make use of imprecise interval data. Each of the expert opinions (interval data) are interpreted as random interval samples of a parent PDF. Consequently, a partial conflict between experts is automatically accounted for through the likelihood function.

<i>Philippiphonteaspidosoma</i> gen. et sp. n., a radically divergent member of the Laophontidae from shell gravel in the East Sea, South Korea, including a review of <i>Folioquinpes</i> Fiers & Rutledge, 1990 ( Copepoda , Harpacticoida )

Huys, Rony,Lee, Jimin Pensoft Publishers 2018 ZooKeys Vol.775 No.-

<P>Abstract</P><P>The primarily marine subtidal family Laophontidae not only contains more valid genera than any other family in the Harpacticoida, it is also one of the most speciose ones in the order, currently accommodating 327 species and subspecies. Based on published records, 25 laophontid species in 12 genera have so far been reported from Korean waters. Here both sexes of a new genus and species of Laophontidae are described, collected from shell gravel off Dokdo Island in the East Sea. <I>Philippiphonteaspidosoma</I><B>gen. et sp. n.</B> displays a radically divergent morphology, including an extreme dorsoventrally depressed body shape which is reminiscent of members of the family Porcellidiidae. The convergent evolution of dorsoventrally flattened body plans in the Harpacticoida is briefly discussed.</P><P>The distribution and habitat preference of laophontid species recorded from the Korean peninsula are summarised. The authenticity of the Korean record of <I>Folioquinpesmangalis</I> Fiers & Rutledge, 1990 from washings of invertebrates and intertidal stones from Jeju Island is reassessed in the light of a discussion of the genus. <I>Folioquinpespseudomangalis</I><B>sp. n.</B> and <I>F.indicus</I><B>sp. n.</B> are proposed as new species for <I>Folioquinpesmangalis</I> Fiers & Rutledge, 1990 <I>sensu</I>Kim (2013) and <I>Laophontechathamensis</I> Sars, 1905 <I>sensu</I>Sewell (1924), respectively. A key to species of <I>Folioquinpes</I> Fiers & Rutledge, 1990 is provided.</P>

A new species of the genus Tegastes (Copepoda: Harpacticoida: Tegastidae) from hydrothermal vents in the Okinawa Trough.

Back, Jinwook,Huys, Rony,Lee, Wonchoel Zoological Society of Japan 2010 Zoological science Vol.27 No.8

<P>We describe a new species, Tegastes okinawaensis, from 583-711 meter-deep hydrothermal vents in the Okinawa Trough, Japan. This species is clearly distinguishable from its congeners by four combined characters, namely 1) the last three abdominal somites are depressed inwardly towards the body, 2) there is sexual dimorphism in the number of setae of P3 and P4, 3) the male antennule is 9-segmented, with the 7th segment formed by incomplete fusion of two segments, and 4) the caudal rami are small with a distorted quadrangular shape. Additionally, the species is easily distinguishable from its congeners by the distal endopodal segment of P4, which is armed with six setae - this character has never been reported in previous descriptions of congeners. This report is the first of a species in the genus Tegastes living at ocean depths of greater than 580 m in the northwestern Pacific.</P>

<i>Acinetobacter kookii</i> sp. nov., isolated from soil

Choi, Ji Young,Ko, Gwangpyo,Jheong, Weonghwa,Huys, Geert,Seifert, Harald,Dijkshoorn, Lenie,Ko, Kwan Soo International Union of Microbiological Societies 2013 International journal of systematic and evolutiona Vol.63 No.12

<P>Two Gram-stain-negative, non-fermentative bacterial strains, designated 11-0202<SUP>T</SUP> and 11-0607, were isolated from soil in South Korea, and four others, LUH 13522, LUH 8638, LUH 10268 and LUH 10288, were isolated from a beet field in Germany, soil in the Netherlands, and sediment of integrated fish farms in Malaysia and Thailand, respectively. Based on 16S rRNA, <I>rpoB</I> and <I>gyrB</I> gene sequences, they are considered to represent a novel species of the genus <I>Acinetobacter</I>. Their 16S rRNA gene sequences showed greatest pairwise similarity to <I>Acinetobacter beijerinckii</I> NIPH 838<SUP>T</SUP> (97.9–98.4 %). They shared highest <I>rpoB</I> and <I>gyrB</I> gene sequence similarity with <I>Acinetobacter johnsonii</I> DSM 6963<SUP>T</SUP> and <I>Acinetobacter bouvetii</I> 4B02<SUP>T</SUP> (85.4–87.6 and 78.1–82.7 %, respectively). Strain 11-0202<SUP>T</SUP> displayed low DNA–DNA reassociation values (<40 %) with the most closely related species of the genus <I>Acinetobacter</I>. The six strains utilized azelate, 2,3-butanediol, ethanol and <SMALL>dl</SMALL>-lactate as sole carbon sources. Cellular fatty acid analyses showed similarities to profiles of related species of the genus <I>Acinetobacter</I>: summed feature 3 (C<SUB>16 : 1</SUB>ω7<I>c</I>, C<SUB>16 : 1</SUB>ω6<I>c</I>; 24.3–27.2 %), C<SUB>18 : 1</SUB>ω9<I>c</I> (19.9–22.1 %), C<SUB>16 : 0</SUB> (15.2–22.0 %) and C<SUB>12 : 0</SUB> (9.2–14.2 %). On the basis of the current findings, it is concluded that the six strains represent a novel species, for which the name <I>Acinetobacter kookii</I> sp. nov. is proposed. The type strain is 11-0202<SUP>T</SUP> ( = KCTC 32033<SUP>T</SUP> = JCM 18512<SUP>T</SUP>).</P>

Additively manufactured titanium scaffolds and osteointegration - meta-analyses and moderator-analyses of in vivo biomechanical testing

Simon Cleemput,Stijn E. F. Huys,Robbert Cleymaet,Wilfried Cools,Maurice Y. Mommaerts 한국생체재료학회 2021 생체재료학회지 Vol.25 No.3

Introduction: Maximizing osteointegration potential of three-dimensionally-printed porous titanium (3DPPT) is an ongoing focus in biomaterial research. Many strategies are proposed and tested but there is no weighted comparison of results. Methods: We systematically searched Pubmed and Embase to obtain two pools of 3DPPT studies that performed mechanical implant-removal testing in animal models and whose characteristics were sufficiently similar to compare the outcomes in meta-analyses (MAs). We expanded these MAs to multivariable meta-regressions (moderator analysis) to verify whether statistical models including reported scaffold features (e.g., “pore-size”, “porosity”, “type of unit cell”) or post-printing treatments (e.g., surface treatments, adding agents) could explain the observed differences in treatment effects (expressed as shear strength of bone-titanium interface). Results: “Animal type” (species of animal in which the 3DPPT was implanted) and “type of post-treatment” (treatment performed after 3D printing) were moderators providing statistically significant models for differences in mechanical removal strength. An interaction model with covariables “pore-size” and “porosity” in a rabbit subgroup analysis (the most reported animal model) was also significant. Impact of other moderators (including “time” and “location of implant”) was not statistically significant. Discussion/conclusion: Our findings suggest a stronger effect from porosity in a rat than in a sheep model. Additionally, adding a calcium-containing layer does not improve removal strength but the other post-treatments do. Our results provide overview and new insights, but little narrowing of existing value ranges. Consequent reporting of 3DPPT characteristics, standardized comparison, and expression of porosity in terms of surface roughness could help tackle these existing dilemmas.