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Fisher, John G.,Choi, Si-Young,Kang, Suk-Joong L. The Korean Ceramic Society 2011 한국세라믹학회지 Vol.48 No.6
The present study aims to identify the effect of sintering atmosphere [$O_2$, 75$N_2$-25 $H_2$ (mol%) and $H_2$] on microstructural evolution at the relatively low sintering temperature of 1040$^{\circ}C$. Samples sintered in $O_2$ showed a bimodal microstructure consisting of fine matrix grains and large abnormal grains. Sintering in 75 $N_2$ - 25 $H_2$ (mol %) and $H_2$ caused the extent of abnormal grain growth to increase. These changes in grain growth behaviour are explained by the effect of the change in step free energy with sintering atmosphere on the critical driving force necessary for rapid grain growth. The results show the possibility of fabricating $(K_{0.5}Na_{0.5})NbO_3$ at low temperature with various microstructures via proper control of sintering atmosphere.
SOME RESULTS ON THE COMMUTATIVE PRODUCT OF DISTRIBUTIONS
Fisher, Brian,Nicholas, Joel-D. Korean Mathematical Society 1999 대한수학회보 Vol.36 No.3
The commutative product of the distributions $x^r lnx and $x^{-r-1}$ is evaluated for r=0,1,2,.... The commutative product of the distributions $x^rln(x+i0) and $(x+i0)^{-r-1}$ is also evaluated for r=1,2,.... Further products are deduced.
Mining intelligent solution to compensate missing data context of medical IoT devices
Fisher, Paul S.,James II, Jimmy,Baek, Jinsuk,Kim, Cheonshik Springer-Verlag 2018 PERSONAL AND UBIQUITOUS COMPUTING Vol.22 No.1
<P>When gathering experimental data generated by medical IoT devices, the perennial problem is missing data due to recording instruments, errors introduced which cause data to be discarded, or the data is missed and lost. When faced with this problem, the researcher has several options: (1) insert what appears to be the best replacement for the missing element, (2) discard the entire instance, (3) use one of the algorithms that will consider the data and then suggest viable candidate values for replacement. We discuss the options and introduce another mining intelligent technique based upon Markov models.</P>
Behavior of exterior reinforced concrete beam-column joints including a new reinforcement
Fisher, Matthew J.,Sezen, Halil Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.40 No.6
Six reinforced concrete beam-column joint specimens were constructed and tested under reverse cyclic loading to failure. The six specimens were divided into three groups, each group representing a different joint design. The main objectives of this study are to investigate the response of joints with three different design, reinforcement detailing and beam strengths, and to evaluate and compare the responses of beam-column joints reinforced with traditional steel rebar and a recently proposed steel reinforcement called prefabricated cage system (PCS). Each of the three test specimen designs included equivalent amount of steel reinforcement and had virtually identical details. The results of the research show that the PCS reinforced joints had a slightly higher strength and significantly larger deformation capacity than the equivalent rebar reinforced joints.
Low-Temperature Sintering of Barium Calcium Zirconium Titanate Lead-Free Piezoelectric Ceramics
Fisher, John G.,Lee, Dae-Gi,Oh, Jeong-Hyeon,Kim, Ha-Nul,Nguyen, Dieu,Kim, Jee-Hoon,Lee, Jong-Sook,Lee, Ho-Yong The Korean Ceramic Society 2013 한국세라믹학회지 Vol.50 No.2
The need for lead-free piezoceramics has caused a renewal of interest in $BaTiO_3$-based systems. Recently, it was found that ceramics in the $(Ba,Ca)(Zr,Ti)O_3$ system have properties comparable to those of $Pb(Zr,Ti)O_3$. However, these ceramics require rather high sintering temperatures of $1450-1550^{\circ}C$. In this work, the effect of $TiO_2$ and CuO addition on the sintering behavior, microstructure, dielectric and piezoelectric properties of $(Ba_{0.85}Ca_{0.15})(Zr_{0.1}Ti_{0.9})O_3$ (BCTZ) ceramics will be discussed. BCTZ ceramics were prepared by the mixed oxide route and 1 mol % of $TiO_2$ or CuO was added. Undoped and doped ceramics were sintered at $1350^{\circ}C$ for 1-5 h. CuO was found to be a very effective sintering aid, with samples sintered for 1 h at $1350^{\circ}C$ having a bulk density of 95% theoretical density; however the piezoelectric properties were greatly reduced, probably due to the small grain size.
Fisher, L.A.,Huh, H.s. Wayne State University Press] 2016 JOURNAL OF MACROECONOMICS Vol.49 No.-
This paper estimates SVARs for four small and three large economies. Sign restrictions are used to identify all the shocks in the SVARs, while being agnostic about the sign of the response of the real exchange rate to a relative monetary policy shock. The large number of sets of impulse responses to be judged by sign restrictions for either retention or rejection is generated by a newly proposed method which utilizes instrumental variable estimation. The responses show an absence of an exchange rate puzzle in each economy. The peak appreciation following a contractionary monetary policy shock occurs with at most a one quarter delay in the small countries and, for the United States, on impact. For the Euro region and Japan, the peak appreciation is in the long run. There is considerable model uncertainty in the responses.
Fisher, Benjamin A,Bang, So-Young,Chowdhury, Muslima,Lee, Hye-Soon,Kim, Jae-Hoon,Charles, Peter,Venables, Patrick,Bae, Sang-Cheol BMJ Publishing Group Ltd 2014 Annals of the Rheumatic Diseases Vol.73 No.4
<P><B>Objectives</B></P><P>Data from North European rheumatoid arthritis (RA) populations has suggested a particularly strong association of gene-environment interaction between smoking and HLA-DRB1 shared epitope (SE) with antibodies to citrullinated α-enolase (CEP-1) and vimentin (cVim) peptides. We investigated this further by examining anticitrullinated peptide/protein antibody (ACPA) fine specificity in a Korean cohort, where there are notable differences in the RA-associated HLA-DRB1 alleles.</P><P><B>Methods</B></P><P>Antibodies to fibrinogen (cFib), α-enolase (CEP-1) and vimentin (cVim) peptides and cyclic citrullinated peptide (CCP) were measured in 513 cases. The Mann-Whitney U test was used to compare antibody levels. Logistic regression generated ORs for RA in a case-control analysis with 1101 controls. Association of ACPA status and erosion in patients with RA was examined by logistic regression.</P><P><B>Results</B></P><P>Anti-CCP, CEP-1, cVim and fibrinogen peptides were found in 86.7%, 63.9%, 45.5% and 74.7%, respectively. The number of ACPA and their levels were associated with SE, with evidence of a gene-dosage effect. There was a particular association of smoking with levels of anti-CEP-1. However, a gene-environment interaction was associated with all the ACPA positive subgroups, albeit the highest OR was seen with the anti-CCP+/cVim+ subset. In the absence of SE, smoking only conferred risk for anti-CCP negative subsets. The presence of erosions was not associated with the number of positive ACPA or specificity.</P><P><B>Conclusions</B></P><P>The SE governed the magnitude and diversity of the ACPA response, but its interaction with smoking did not exclusively segregate with any of the ACPA specificities studied here. Smoking was associated with RA by SE-dependent and independent effects.</P>