Use of a big data analysis technique for extracting HRA data from event investigation reports based on the Safety-II concept

The safe operation of complex socio-technical systems including NPPs (Nuclear Power Plants) is a determinant for ensuring their sustainability. From this concern, it should be emphasized that a large portion of safety significant events were directly and/or indirectly caused by human errors. This means that the role of an HRA (Human Reliability Analysis) is critical because one of its applications is to systematically distinguish error-prone tasks triggering safety significant events. To this end, it is very important for HRA practitioners to access diverse HRA data which are helpful for understanding how and why human errors have occurred. In this study, a novel approach is suggested based on the Safety-II concept, which allows us to collect HRA data by considering failure and success cases in parallel. In addition, since huge amount of information can be gathered if the failure and success cases are simultaneously involved, a big data analysis technique called the CART (Classification And Regression Tree) is applied to deal with this problem. As a result, it seems that the novel approach proposed by combining the Safety-II concept with the CART technique is useful because HRA practitioners are able to get HRA data with respect to diverse task contexts

Exotic quark effects on the Higgs sector of the USSM at the LHC

The Higgs sector of the U(1)-extended supersymmetric model is studied with great detail. We calculate the masses of the Higgs bosons at the one-loop level. We also calculate at the one-loop level the gluon-involving processes for the productions and decays of the scalar Higgs bosons of the model at the energy of the CERN Large Hadron Collider (LHC), where the radiative corrections due to the loops of top, bottom, and exotic quarks and their scalar partners are taken into account. We find that the exotic quark and exotic scalar quarks in the model may manifest themselves at the LHC, since the production of the heaviest scalar Higgs boson via gluon fusion processes is mediated virtually by the loops of exotic quark and exotic scalar quarks, for a reasonable parameter set of the model.Comment: 36 pages, 13 figures, JP

Stress relaxation and mechanical properties of RL-1973 and PD-200-16 silicone resin sponge materials

Stress relaxation tests were conducted by loading specimens in double-lap shear to a preselected strain level and monitoring the decay of stress with time. The stress relaxation response characteristics were measured over a temperature range of 100 to 300 K and four strain levels. It is concluded that only a slight amount of stress relaxation was observed, and the stiffness increased approximately two orders of magnitude over the range of temperatures

Higgs bosons of a supersymmetric U(1)′U(1)' model at the ILC

We study the scalar Higgs sector of the next-to-minimal supersymmetric standard model with an extra U(1), which has two Higgs doublets and a Higgs singlet, in the light leptophobic $Z'$ scenario where the extra neutral gauge boson $Z'$ does not couple to charged leptons. In this model, we find that the sum of the squared coupling coefficients of the three neutral scalar Higgs bosons to $ZZ$, normalized by the corresponding SM coupling coefficient is noticeably smaller than unity, due to the effect of the extra U(1), for a reasonable parameter space of the model, whereas it is unity in the next-to-minimal supersymmetric standard model. Thus, these two models may be distinguished if the coupling coefficients of neutral scalar Higgs bosons to $ZZ$ are measured at the future International Linear Collider by producing them via the Higgs-strahlung, $ZZ$ fusion, and $WW$ fusion processes.Comment: 12 pages, 2 figures, 1 table, PR

MaRMI-III: a methodology for component-based development

This study, supported by the Korea Ministry of Information and Communication, contributed to advancing the paradigm of software component-based development by developing a detailed process, techniques, and guidelines for making the most of component technologies. The outcome was a new CBD methodology named Magic and Robust Methodology Integrated III (MaRMI-III). MaRMI-III is now considered as a standard development methodology for using component technologies in Korea. To date, more than 100 Korean software development companies have adopted the methodology developed in this study

A textural and chemical study of white mica in the South Mountain Batholith, Nova Scotia: primary versus secondary origin

White mica (HM) In peralumlnous granitoid rocks of the South Mountain Batholith (SMB) and East Kemptville leucogranite (EKL) of Nova Scotia have been examined to see if parameters can be used to distinguish between primary and secondary grains. Texturally very little of the UN in the SMB can unequivocally be classified as primary, whereas most of the UM In the EKL is consistent with such an origin. Although discriminant diagrams which utilize major element chemistry do not provide unambiguous divisions between primary and secondary HM, there appear to be some chemical trends which indicate that the bulk composition of the host rock is an important control. This is best exemplified by volatile (i.e. F) and trace element contents. Including the rare earth elements. For example, F, Li, Rb and Cs are systematically higher In UM from relatively more evolved units of the SMB. The importance of bulk rock composition is also indicated by the enrichment of lithophile elements In UM from the EKL. itself enriched in these same elements. The octahedral impurities in UM of the SMB are accommodated via blotltlc and pbengitic substitutions, whereas UM from the EKL is dominantly pbengitic. Comparison to experimentally determined stability fields for muscovite indicate that HM from the SMB re-equilibrated to 500-600oC In the more primitive units and 400-550oC In the more evolved units and greisens. Recent experimental data also suggest crystallization of the UM may have occurred at pressures of ca. 2 kb in melts with 2-3 wt.% H2O. RÉSUMÉ On a examiné les micas blancs (MB) dans les roches granltoldes péralumlneuses du Batholite de South Mountain (BSM) et du leucogranite d'East Kemptville (LEK) en Nouvelle-Écosse afin de déterminer si certains paramétres peuvent servlx a dlstinguer les grains primalres des grains secondaires. É l'égard de la texture, une très faible proportion des MB dans le BSM peuvent, sans l’ombre d'un doute, être classes comae primalres alors que la plupart des MB dans le LEK sont compatibles avec une telle orlglne. Bien que les diagrammes discriminant par chimle des éléments majeure ne procurent aucune Unite precise entre les MB primalres et secondaires, on semble y discemer des tendances chlmiques lndlquant une Influence préponderante de la composition totale de l'encaissant. Les contenus en éléments volatiles (i.e. F) et en traces, y comprises les terres rares, en sont la meilleure illustration. Par exemaple, la teneur en F, Li, Rb et Cs est systèmatiquement plus éleveé dans les MB provenant des unités plus évoluées, par comparaison, du BSM. L'importance de la composition totale de la roche est aussi attestée par l'enrichtssement en éléments lithophiles des MB du LEK (luimeme enrichl en ces éléments). L'accoramodation des impurités octaédriques dans les MB du BSM se fait par le biais de substitutions biotitiques et phengitiques alors que les MB du LEK sont surtout phengitiques. Une comparaison des MB du BSM aux doroaines de stabilites de la muscovite détermines experimentalement révèle que leur ré- équilibrage s'est effectue entre 500 et 600oC dans les unités les plus primitives et entre 400 et 550oC dans les unités plus évoluées et les greisens. À la lumlère de données expérimentales récentes, la cristallisation des MB aurait eu lieu àa des pressions d'environ 2 kb dans des bains ayant de 2 à 3 % en poids d'H2O. [Traduit par le journal

Oxygen reduction in an acid medium : electrocatalysis by CoNPc(1,2) impregnated on a carbon black support; effect of loading and heat treatment

O2 reduction in an acid medium has been investigated on a transition metal macrocycle, CoNPc(1,2), impregnated on a carbon black support with a high dibutylphthalate adsorption value, using a rotating disk electrode and voltammetry techniques described previously, combined with X-ray photoelectron spectroscopy measurements. Optimal activity was found for a bilayer coverage (n = 2) at 17%-18% w/w loading. Heat treatment seems to be beneficial for n 3: it increases the overall number N of exchanged electrons and improves the electrode wetting. For the most active samples, mixed Co(II)/Co(III) valencies were displayed