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Songsak Srisanga,Sunpetch Angkititrakul,Patcharee Sringam,Phuong T. Le Ho,An T. T. Vo,Rungtip Chuanchuen 대한수의학회 2017 Journal of Veterinary Science Vol.18 No.3
Salmonella enterica isolates (n = 122), including 32 serotypes from 113 dogs and 9 cats, were obtained from household dogs (n = 250) and cats (n = 50) during 2012–2015. The isolates were characterized by serotyping, antimicrobial resistance phenotyping and genotyping, and virulence gene screening. Serovars Weltevreden (15.6%) and Typhimurium (13.9%) were the most common. The majority (43%) of the isolates were multidrug resistant. The dog isolates (12.3%) harbored class 1 integrons, of which the dfrA12-aadA2 cassette was most frequent (66.7%). The only class integron in serovar Albany was located on a conjugative plasmid. Two ESBL-producing isolates (i.e., a serovar Krefeld and a serovar Enteritridis) carried blaTEM and blaCTX-M, and the blaTEM gene in both was horizontally transferred. Of the plasmid-mediated quinolone resistance genes tested, only qnrS (4.9%) was detected. Most Salmonella isolates harbored invA (100%), prgH (91.8%), and sipB (91%). Positive associations between resistance and virulence genes were observed for blaPSE-1/orgA, cmlA/spaN, tolC, and sul1/tolC (p < 0.05). The results suggest that companion dogs and cats are potential sources of S. enterica strains that carry resistance and virulence genes and that antimicrobial use in companion animals may select for the examined Salmonella virulence factors.
Application of Multibody Dynamics Simulation in Approximation of Rail Vehicle Dynamic Envelope
Songsak Suthasupradit,Thitiwut Petcharat,김기두,Rattapoohm Parichatprecha 한국철도학회 2023 한국철도학회논문집 Vol.26 No.12
The master plan for Thailand’s Eastern High-Speed Rail Project calls for the Airport Rail Link to be shared with high-speed trains. To ensure the safety of mixed operations, it is imperative to assess loading and structural gauges. This study determined the dynamic envelopes of rail vehicles using multibody dynamics modeling, focusing on three rolling stock models—Siemens Desiro UK Class 360/2 EMU, CRH2C EMU, and Shinkansen Series 300 High-Speed EMU— across a spectrum of operating conditions. Factors such as train mass, suspension characteristics, running speed, wheel wear, track geometry, and track irregularities were incorporated as dynamic simulation parameters. The greatest vehicle movement occurred along the westbound curve path, particularly at the transition between the 996-meter-radius curve to the 180-meter-radius curve. The Shinkansen Series 300 exhibited the greatest lateral and vertical maneuverability. Both the CRH2C EMU and Shinkansen 300 Series trains exceeded the structural envelope limitations of the Airport Rail Link.
A 4-node Shell Element with Enhanced Assumed Strain and Assumed Natural Strain
송삭(Songsak),사차락(Sacharuck),김영회(Kim Young Hoe),김기두(Kim Ki Du) 대한토목학회 2006 대한토목학회 학술대회 Vol.2006 No.10
The formulation of a nonlinear shell element is presented for the solution of problems of plates and shells. The membrane and shear behavior of the present element was improved by using enhanced assumed strain (EAS) and assumed natural strain method (ANS) such that the element performs very well in thin shell problems. The numerical examples show very good agreement with the references.
Panot Chobsilprakob,Songsak Suthasupradit,김기두 한국강구조학회 2011 International Journal of Steel Structures Vol.11 No.2
A time domain approach for predicting the flutter response of long-span bridges was presented. The unsteady aerodynamic forces were presented by the indicial functions through a convolution integral, whereas the nonlinear least square method was used to calculate the aerodynamic indicial parameters. The nonlinear dynamic analysis which includes both the geometric and material nonlinearities due to the unsteady self excited aerodynamics force was considered. Numerical analyses were then performed using three dimensional finite element model of the suspension bridge. The results show that the geometric and material nonlinearities have a significant influence on the critical velocity and the response of long-span bridges.
Anaphat Manovachirasan,Songsak Suthasupradit,최준혁,김범준,김기두 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
The crucial diff erences between conventional rail with split-type connectors and continuous welded rails are axial stress in the longitudinal direction and stability, as well as other issues generated under the infl uence of loading eff ects. Longitudinal stresses generated in continuously welded rails on railway bridges are strongly infl uenced by the nonlinear behavior of the supporting system comprising sleepers and ballasts. Thus, the track structure interaction cannot be neglected. The rail-support system mentioned above has properties of non-uniform material distribution and uncertainty of construction quality. The linear elastic hypothesis therefore cannot correctly evaluate the stress distribution within the rails. The aim of this study is to apply the nonlinear fi nite element method using the nonlinear coupling interface between the track and structural model and to illustrate the welded rail behavior under the loading eff ect and uncertain factors of the ballast. Numerical results of nonlinear fi nite analysis with a three-dimensional solid and frame element model are presented for a typical track–bridge system. A composite plate girder, modeled by solid and shell elements, is also analyzed to consider the behavior of the welded rail. The analysis result showed buckling under the independent calculations of load cases, including ‘temperature change’, ‘bending of the supporting structure’, and ‘braking’ of the railway vehicle. A parametric study of the load combination method and the loading sequence is also included in this analysis.
Panot Chobsilprakob,김기두,Songsak Suthasupradit,Anaphat Manovachirasan 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.1
The design of cable supported bridge with long span is challenging due to the sensitivity of the dynamic excitation. Theaerodynamic instability caused by fluttering can severely affect the safe operation. An application of indicial function to the flutteranalysis in time domain is applied to the Great belt East Bridge for both completed and erection stage. The nonlinear least squaremethod was used to extract the aerodynamic indicial parameters for flutter analysis in time domain. The geometric nonlinearityis considered through the nonlinear dynamic analysis. The results showed the good agreement with the wind tunnel test and thevalidity of the indicial function as well as the important role of the geometrically nonlinear analysis during deck erection.
Monton Chaowalit,Luprasong Chitradee,Suksaeree Jirapornchai,Songsak Thanapat 경희대학교 융합한의과학연구소 2021 Oriental Pharmacy and Experimental Medicine Vol.21 No.1
The aim of this work was to develop the film forming polymeric dispersion (FFPD) containing Centella asiatica extract for topical use. Eudragit® RS 30D and Eudragit® RL 30D were used as the film forming agents. Glycerin was used as a plasti-cizer. Ethanol was used as penetration enhancer and for shortening of film drying time. The best FFPD formulation contained Eudragit® RL 30D 50%, glycerin 20%, ethanol 20%, and C. asiatica extract 10%. It formed a complete film within 10–15 min after application to the skin. The low content of madecassoside and asiaticoside was released from FFPD. Approximately 5% of madecassoside and 6% of asiaticoside were accumulated in the skin within 12 h of skin permeation test. FFPD was stable for more than 60 days but less than 90 days. Nevertheless, formulations will be developed in our future work to improve the stability and increase the skin permeation of the formulation.
Skew constacyclic codes over finite commutative semi-simple rings
Hai Q. Dinh,Bac Trong Nguyen,Songsak Sriboonchitta 대한수학회 2019 대한수학회보 Vol.56 No.2
This paper investigates skew $\Theta$-$\lambda$-constacyclic codes over $R={\bf F}_0\oplus {\bf F}_1 \oplus \cdots \oplus {\bf F}_{k-1}$, where ${\bf F}_i$'s are finite fields. The structures of skew $\lambda$-constacyclic codes over finite commutative semi-simple rings and their duals are provided. Moreover, skew $\lambda$-constacyclic codes of arbitrary length are studied under a new definition. We also show that a skew cyclic code of arbitrary length over finite commutative semi-simple rings is equivalent to either a cyclic code over $R$ or a quasi-cyclic code over $R$.
SKEW CONSTACYCLIC CODES OVER FINITE COMMUTATIVE SEMI-SIMPLE RINGS
Dinh, Hai Q.,Nguyen, Bac Trong,Sriboonchitta, Songsak Korean Mathematical Society 2019 대한수학회보 Vol.56 No.2
This paper investigates skew ${\Theta}-{\lambda}$-constacyclic codes over $R=F_0{\oplus}F_1{\oplus}{\cdots}{\oplus}F_{k-1}$, where $F{_i}^{\prime}s$ are finite fields. The structures of skew ${\lambda}$-constacyclic codes over finite commutative semi-simple rings and their duals are provided. Moreover, skew ${\lambda}$-constacyclic codes of arbitrary length are studied under a new definition. We also show that a skew cyclic code of arbitrary length over finite commutative semi-simple rings is equivalent to either a cyclic code over R or a quasi-cyclic code over R.