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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>
Generation of Finite Inductive, Pseudo Random, Binary Sequences
Fisher, Paul,Aljohani, Nawaf,Baek, Jinsuk Korea Information Processing Society 2017 Journal of information processing systems Vol.13 No.6
This paper introduces a new type of determining factor for Pseudo Random Strings (PRS). This classification depends upon a mathematical property called Finite Induction (FI). FI is similar to a Markov Model in that it presents a model of the sequence under consideration and determines the generating rules for this sequence. If these rules obey certain criteria, then we call the sequence generating these rules FI a PRS. We also consider the relationship of these kinds of PRS's to Good/deBruijn graphs and Linear Feedback Shift Registers (LFSR). We show that binary sequences from these special graphs have the FI property. We also show how such FI PRS's can be generated without consideration of the Hamiltonian cycles of the Good/deBruijn graphs. The FI PRS's also have maximum Shannon entropy, while sequences from LFSR's do not, nor are such sequences FI random.
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.
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.
Prostate Cancer Cell-Specific Cytotoxicity of Sub-Micron Potassium Niobate Powder
Fisher, John G.,Thuan, Ung Trong,Farooq, Muhammad Umer,Chandrasekaran, Gopalakrishnan,Do Jung, Young,Hwang, Eu Chang,Lee, Je-Jung,Lakshmanan, Vinoth-Kumar American Scientific Publishers 2018 Journal of Nanoscience and Nanotechnology Vol.18 No.5
<P>Oxide nanoparticles have numerous potential applications in medicine such as carriers for therapeutic drugs, contrast agents for bio-imaging and targeting agents for tumors. Oxide nanoparticles may also have an inherent cytotoxicity towards cancer cells, as recently found for cerium oxide. KNbO3 nanoparticles have a combination of low toxicity and nonlinear optical properties which make them attractive for use as a bio-imaging material. However, little is known yet about the cytotoxicity of KNbO3 particles towards cancerous cells. In the present work, the cytotoxicity of KNbO3 particles to normal and prostate cancer cell lines is studied. The mixed oxide method is used to prepare KNbO3 powder. Using dynamic light scattering the mean particle diameter of the KNbO3 powder is found to be similar to 500 nm. X-ray diffraction, Fourier transform infra-red spectroscopy and Raman scattering spectroscopy are used to examine the structure of the KNbO3 powder. Powder morphology is examined using scanning electron microscopy. MTT assays of EA. hy926, PC-3 and DU-145 cell lines are carried out to study cell-specific cytotoxicity. KNbO3 sub-micron particles are found to have low toxicity to PC-3 cells, moderate toxicity to EA. hy926 cells and high toxicity to DU-145 cells. A new avenue towards the treatment of prostate cancer may be opened by the cell-specific cytotoxicity of KNbO3.</P>
AMPK Promotes Aberrant PGC1β Expression To Support Human Colon Tumor Cell Survival
Fisher, Kurt W.,Das, Binita,Kim, Hyun Seok,Clymer, Beth K.,Gehring, Drew,Smith, Deandra R.,Costanzo-Garvey, Diane L.,Fernandez, Mario R.,Brattain, Michael G.,Kelly, David L.,MacMillan, John,White, Mic American Society for Microbiology 2015 Molecular and cellular biology Vol.35 No.22
<P>A major goal of cancer research is the identification of tumor-specific vulnerabilities that can be exploited for the development of therapies that are selectively toxic to the tumor. We show here that the transcriptional coactivators peroxisome proliferator-activated receptor gamma coactivator 1β (PGC1β) and estrogen-related receptor α (ERRα) are aberrantly expressed in human colon cell lines and tumors. With kinase suppressor of Ras 1 (KSR1) depletion as a reference standard, we used <U>fu</U>nctional <U>si</U>gnature <U>on</U>tology (FUSION) analysis to identify the γ1 subunit of AMP-activated protein kinase (AMPK) as an essential contributor to PGC1β expression and colon tumor cell survival. Subsequent analysis revealed that a subunit composition of AMPK (α2β2γ1) is preferred for colorectal cancer cell survival, at least in part, by stabilizing the tumor-specific expression of PGC1β. In contrast, PGC1β and ERRα are not detectable in nontransformed human colon epithelial cells, and depletion of the AMPKγ1 subunit has no effect on their viability. These data indicate that Ras oncogenesis relies on the aberrant activation of a PGC1β-dependent transcriptional pathway via a specific AMPK isoform.</P>
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.