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Antimicrobial susceptibility profile of community acquired and nosocomial isolates of Escherichia coli from clinical blood culture specimens at a Nigerian university teaching hospital

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Asian Pacific Journal of Tropical Medicine 2010年第8期3卷 662-665页

作者： Jombo GTA Akpan S Epoke J Denen Akaa P eyong ki Gyuse AN Department of Medical Microbiology and Parasitology College of Health SciencesBenue State UniversityPMB 102119 MakurdiNigeria Department of Medical Microbiology and Parasitology College of Medical SciencesUniversity of CalabarPMB 1115 Calabar.Nigeria Department of Surgery College of Health SciencesBenue state University MakurdiPMB 102119 MakurdiNigeria Department of Paediatrics College of Medical SciencesUniversity of Calabar.PMB 1115 CalabarNigeria Department of Family Medicine College of Medical SciencesUniversity of Calabar.PMB 1115 CalabarNigeria

Objective:To ascertain the antibiotic susceptibility patterns of Escherichia coli recovered from blood culture specimens in ***:The study was retrospective in nature and was carried out at University of Calabar Teaching Hospital(UCTH) *** generated from blood culture specimens over a five year period(Feb.2004-Feb.2009) was compiled, relevant information such as age,sex,organism recovered and antibiotic susceptibility patterns were obtained from patients *** were collected,transported,stored and processed using standard laboratory *** obtained was analysed using Epi Info 6 statistical ***:Escherichia coli was responsible for 15.3%(31/203) of the blood infections being the third most common microorganism *** community acquired(CA) isolates of the organism were significantly less resistant(P0.05).Majority(>95.0%) of the NC isolates of Escherichia coli were resistant to six of the antibiotics ***:Control mechanisms for hospital acquired infections should be stepped up so as lo limit the spread of the highly resistant bacterial *** the sale and consumption of antibiotics by the public need to be regulated.

关键词： Susceptibility Antimicrobial Escherichia coli Community acquired Nosocomial Resistance

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Utilization of traditional healers for treatment of malaria among female residents in Makurdi city and its environs

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Asian Pacific Journal of Tropical Medicine 2010年第7期3卷 563-566页

作者： Jombo GTA Mbaawuaga EM Denen Akaa P Dauda AM eyong ki Akosu JT Etukumana EA Department of Medical Microbiology and Parasitology College of Health SciencesBenue State UniversityPMB 102119 MakurdiNigeria Department of Biological Sciences Faculty of ScienceBenue State UniversityPMB 102119 MakurdiNigeria Department of Surgery College of Health SciencesBenue State University MakurdiNigeria Department of Histopathology Faculty of Medical SciencesUniversity of JosJosNigeria Department of Paediatrics College of Medical SciencesUniversity of CalabarCalabarNigeria Department of Community Medicine College of Medical SciencesUniversity of JosNigeria Department of Family Medicine University of Uyo Teaching Hospital UyoNigeria

Objective:To ascertain the role of traditional healers in malaria treatment and its impact on control of the ***:The study was cross-sectional in ***-run structured and semi-structured questionnaires were either interviewer or self administered to adult women aged 18 years old and *** holds were selected using systematic random sampling *** such as age,educational level,marital status,occupation and methods of malaria treatment were *** group discussions about beliefs and perceptions on utilization of traditional healers and in depth discussions on treatment and control of malaria were also carried ***:Of the 2 075 respondents studied,49.7%(n=1 031) utilized traditional healers for treatment of malaria,including 16.7%(n=172) utilizing traditional healers strictly while 83.3%(n=859) combining it with other treatment methods such as hospital/clinic, pharmacy/chemist shop,herbs or spiritual *** major contributors to utilization of traditional healers were:illiteracy and ignorance,poverty,unemployment/underemployment and slow pace of the comprehensive package implementation of the "roll back malaria"(RBM) programme initiate in the ***:Health education should be intensified while adequate facilities put in place to commence home management of malaria and probable free distribution of the artemisinin-based combination therapy(ACT).

关键词： Traditional healers Utilization Malaria treatment Adult-women

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Effect of drawing speed on microstructure distribution and drawability in twinning-induced plasticity steel during wire drawing

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Journal of Iron and Steel Research International 2020年第5期27卷 577-587页

作者： Joong-ki Hwang School of Mechanical Engineering Tongmyong UniversityBusan 48520Republic of Korea

The effect of drawing speed on temperature rise and microstructure distribution in twinning-induced plasticity(TWIP)steel during wire drawing has been investigated to improve drawability for wire rod *** wire drawing process is performed at room temperature,heat is generated due to the plastic deformation and friction at the wire-die *** steel wires subjected to the low drawing speed(LD)of 0.5 m/min and the high drawing speed(HD)of 5.0 m/min were analyzed using the numerical simulation and electron backscatter diffraction ***,the specimens subjected to the HD had a higher drawability by about 18%compared to the LD,which is totally different from the general behavior of plain carbon pearlitic *** LD wire had uniform temperature distribution along the radial direction during wire *** contrast,the HD wire had a temperature gradient along the radial direction due to the higher frictional effect at surface:the minimum temperature of 58℃ at center area and the maximum temperature of 143 C at surface *** higher stacking fault energy of HD wire at the surface area due to the high temperature rise retarded twinning rate,resulting in the prevention of fast exhaustion in ductility in comparison with the LD wires since the earlier depletion of twins at surface area is known as the main reason for the fracture of TWIP steel during wire ***,HD process delayed the fracture strain of wire and increased the uniformity of microstructure and mechanical properties along the radial direction.

关键词： Twinning-induced plasticity steel Wire drawing Deformation twin Drawing speed Temperature rise

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Strain hardening rate dependency of deformation shape,strain distribution,and contact pressure during wire flat rolling

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Journal of Iron and Steel Research International 2023年第3期30卷 475-486页

作者： Joong-ki Hwang School of Mechatronics Engineering Korea University of Technology and EducationCheonan 31253Republic of Korea

The effect of the strain hardening exponent(n)of a material on the changes in shape,strain inhomogeneity,and contact pressure was investigated during wire flat rolling to understand its effect on the deformation behavior of a flat-rolled wire and to determine the optimal working conditions with *** deformation behaviors of wires with various n values were systematically compared using finite element *** shape of the deformed wire was found to depend on the n value of the *** the contact width and lateral spreading of the wire decrease with increasing n,resulting in a large reduction in area with the n *** strain homogeneity of the wire increases with the n value of the *** improvement in the strain homogeneity with the n value is attributable to two factors:a lower strain concentration in the central region and a higher overall elongation as n *** addition,the average effective strain of the wire cross section decreases with the n value of a material during wire flat *** contact pressure distribution on the surface of the wire differs significantly depending on the n *** materials with a low n value,the contact pressure exhibits a higher value at the entry and edge zones of the contact *** contrast,materials with high n values exhibit a higher contact pressure at the exit *** behavior can be explained by the strain hardening behavior of the material during wire flat rolling.

关键词： Strain hardening exponent Wire flat rolling Shape change Strain inhomogeneity Contact pressure

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Density functional theory study on the role of ternary alloying elements in TiFe-based hydrogen storage alloys

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Journal of Materials Science & Technology 2021年第33期92卷 148-158页

作者： Won-Seok Ko ki Beom Park Hyung-ki Park School of Materials Science and Engineering University of UlsanUlsan 44610Republic of Korea Functional Materials and Components R&D Group Korea Institute of Industrial TechnologyGangneung 25440Republic of Korea

The role of additional ternary alloying elements on the performance of stationary TiFe-based hydrogen storage alloys was investigated based on first-principles density functional theory *** a basic step for examinations,the site preference of each alloying element in the stoichiometric and nonstoichiometric B2TiFe compounds was clarified considering possible antisite *** on the revealed site preference,the effect of various possible ternary elements on the hydrogen storage was examined by focusing on the formation enthalpies of TiFeH and TiFeH_(2) hydrides,which were closely related to the change in the location of plateaus in the pressure-composition-temperature *** physical properties such as the volume expansion due to hydride formation were also examined to provide additional criteria for selecting optimum alloying conditions in future alloying design *** alloying elements that maximize the grain boundary embrittlement due to the solute segregation were proposed for the enhanced initial activation of TiFe-based hydrogen storage alloys.

关键词： Hydrogen storage alloy Titanium-iron Density functional theory calculation Metallic hydride

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Developing a geospatial web-GIS system for landscape and urban planning

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International Journal of Digital Earth 2013年第6期6卷 580-588页

作者： Junghoon ki Department of Public Administration Myongji UniversitySeoulKorea

This study discusses a geographical information system(GIS)for operating a local government’s landscape and urban planning activities via a *** this web-GIS system will help build a more realistic landscape and urban planning model that includes citizen participation and city *** approach is applicable to ubiquitous city(u-city)development based on geospatial web and its related *** approach presented is built on six selected elements of a u-city *** outcome of the study includes sustainable analysis,environmental planning,urban planning,and city market*** outcome is applicable to cities that are planning to adopt the u-city system or advanced telecommunication or planning tools into their urban frameworks.

关键词： geospatial data integration virtual reality 3D modeling ubiquitous city sustainable development

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The IOSS Chaos Synchronization Method

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Chinese Physics Letters 2011年第1期28卷 32-35页

作者： Choon ki Ahn Faculty of the Department of Automotive Engineering Seoul National University of Science&Technology172 Gongneung 2-dongNowon-guSeoul 139-743Korea

A new synchronization method, called the input/output-to-state stable synchronization (IOSSS) method, is proposed for a general class of chaotic systems with external disturbance. By introducing Lyapunov stability theory and linear matrix inequality (LMI) for the first time, the IOSSS controller is shown to not only guarantee the synchronization of the chaotic systems, but also reduce the effect of external disturbance. The proposed IOSSS controller can be obtained by solving the LMI, which can easily be done using standard numerical packages. A numerical example is given to demonstrate the availability of the proposed method.

关键词： method chaotic inequality

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In?uence of Carbon Equivalent Value on the Weld Bead Bending Properties of High-Strength Low-Alloy Steel Plates

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Journal of Materials Science & Technology 2017年第4期33卷 321-329页

作者： ki Hyuk kim In Jun Moon ki Won kim ki Bong Kang Byung Gyu Park Kwang Seok Lee R&D Center of Dongkuk Steel Mill Co. Ltd Pohang 790-729 South Korea Korea Institute of Materials Science Implementation Research Division Materials Deformation Department 797 Changwondaero Changwon Gyeongnarn642-831 South Korea

The contribution of chemical compositions in terms of carbon equivalent value（CEV） on impending crack propagation during weld bead bend tests（WBBTs） was studied with five different high-strength lowalloy steel plates that underwent different rolling processes. The test showed that cracks developed at the weld joint, easily passed through the coarse-grain heat-affected zone（CGHAZ）, and finally were arrested within the heat-affected zone（HAZ）. An apparent decrease in the average crack length, which consequently indicated improvement in crack arrestability, was found with decreasing CEV. In addition,the relatively fine microstructure in the HAZ of low-CEV steel plates helped in preventing the crack from further propagation. Special emphasis was placed on the empirical expectation of critical CEV above which WBBT might fail.

关键词： Mechanical characterization Steel Welding Fracture Crack arrestability against bending

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Diagnostic analysis of the asymmetric structure of the simulated landfalling typhoon “Haitang”

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Progress in Natural Science:Materials International 2008年第10期18卷 1249-1260页

作者： ki-Ryong Kang National Institute of Meteorological Research KMASeoulRepublic of Korea

The landfailing processes of Typhoon"Haitang"near Lianjiang of Fujian Province of China from 00 UTC 19 to 12 UTC 20 July 2005 were reproduced by using the nesting non-hydrostatic WRF model and data assimilation technology (LevelⅡDoppler radar data of Changle of Fujian Province are assimilated to the simulation every one hour from 01 to 06 UTC 19 July 2005).The mesoscale structure and evolution of the typhoon before,during,and after its landfall were *** simulation data show that the assimilation exper- iment with the high temporal-and-spatial-resolution radar radial velocity and reflectivity data can produce much better simulation of the typhoon track,intensity evolution and landfalling location than the control experiment without assimilating radar *** using the assimilation experimental data,the mesoscale fine-mesh structure and evolution before and after typhoon landfall were analyzed. Because of the influence of sea-land thermodynamic difference,two asymmetric convective regions were located at ocean and land, *** better understand and investigate the asymmetric-structure characteristics of the landfalling typhoon,several dynamical diagnostic tools,the helicity (H),the moist potential vorticity (MPV),the convective vorticity vector (CVV),the moist vorticity vector (MVV),which are associated with the development of strong convections,are *** analysis illuminates that the distribu- tions of these physical diagnostic parameters are totally asymmetric,and subsequently,the associated convections also show distinct asymmetry.

关键词： Typhoon Landfall Convective vorticity vector Moist vorticity vector

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L_2-L_∞ learning of dynamic neural networks

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Chinese Physics B 2010年第10期19卷 1-6页

作者： Choon ki Ahn Department of Automotive Engineering Seoul National University of Technology 172 Gongneung 2-dong Nowon-gu Seoul 139-743 Korea

This paper proposes an y2-y∞ learning law as a new learning method for dynamic neural networks with external disturbance. Based on linear matrix inequality （LMI） formulation, the y2-y∞ learning law is presented to not only guarantee asymptotical stability of dynamic neural networks but also reduce the effect of external disturbance to an y2-y∞ induced norm constraint. It is shown that the design of the y2-y∞ learning law for such neural networks can be achieved by solving LMIs, which can be easily facilitated by using some standard numerical packages. A numerical example is presented to demonstrate the validity of the proposed learning law.

关键词： y2-y∞ learning law dynamic neural networks linear matrix inequality Lyapunovstability theory

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