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Quantitative analysis of NaI(Tl) gamma-ray spectrometry using an artificial neural network
Kim, Jinhwan,Lim, Kyung Taek,Kim, Junhyeok,Kim, Chang-jong,Jeon, Byoungil,Park, Kyeongjin,Kim, Giyoon,Kim, Hojik,Cho, Gyuseong Elsevier BV * North-Holland 2019 Nuclear Instruments & Methods in Physics Research. Vol. No.
<P><B>Abstract</B></P> <P>In this manuscript, we propose an algorithm based on an artificial neural network (ANN) for the analysis of the NaI(Tl) gamma-ray spectra with radioisotope (RI) mixtures to identify RIs and determine the relative activity levels of the identified RIs. The ANN was trained based on the spectra that were generated by synthesizing previously identified spectra from single RIs, considering the characteristics of the measurement environments, such as gain shift effects and statistical fluctuations in the spectrum. The proposed ANN was evaluated through several measured spectra that contained up to six certified reference materials for a quantitative analysis. We also evaluated the shift in the spectra due to temperature variations in the range of 0–50 °C and the low-count spectra with a one-second acquisition period. These results were compared with those from an ANN trained through simulated spectra to emphasize the importance of acquiring a high-quality training dataset. In addition, we show that complex low-resolution spectra can be accurately analyzed with the proposed ANN under various scenarios, in which the maximum root mean square error was found to be 2.8%.</P>
Enhanced conductance properties of UV laser/RTA annealed Al-doped ZnO thin films
Kim, Jinhwan,Ji, Jae-Hoon,Min, Sung-Wook,Jo, Gae-Hun,Jung, Min-Woo,Park, Min-Jae,Lee, Sang-Kwon,Koh, Jung-Hyuk Elsevier 2017 Ceramics international Vol.43 No.4
<P><B>Abstract</B></P> <P>Thin films comprising 0.5mol% aluminum-doped zinc oxide (AZO) were prepared on glass substrates by a spin-coating method for transparent conducting oxide (TCO) applications. UV laser was selected for the annealing of AZO thin films, due to the well matched energy bandgap between UV laser and AZO films. After the rapid thermal annealing (RTA) process, post UV laser annealing was carried out by varying the scan speed of the laser beam, and the effects of laser annealing on the structural, morphological, electrical, and optical properties were analyzed. The results indicated that UV laser annealing based on various scan speeds affects the microstructure, sheet resistance, and optical transmittance of the AZO thin films, compared with those of the only RTA processed thin films. X-ray diffraction (XRD) analysis showed that all films that preferentially grew normally on the substrate had a (<I>002</I>) peak. The optical transmittance spectra of the laser/RTA annealed AZO thin films exhibited greater than 83% transmittance in the visible region. Also, the sheet resistance (1.61kΩ/sq) indicated that optimized UV laser annealing after the RTA process improves film conductance.</P>
Kim, Jinhwan,Lee, Junseok,Lee, Yeong Mi,Pramanick, Swapan,Im, Sooseok,Kim, Won Jong Elsevier 2017 Journal of controlled release Vol.259 No.-
<P><B>Abstract</B></P> <P>Along with the successful discovery of paclitaxel as an anticancer drug, natural products have drawn great attention in drug discovery. Recently, andrographolide (AND) from <I>Andrographis paniculata</I> was reported to provide several benefits, including an anticancer effect. However, the extremely low solubility of the compound in an aqueous medium was an obstacle to overcome for the systemic administration and clinical application of AND. Based on our previous report, we formulated a water-soluble nanoconstruct by forming a boronic ester between the <I>cis</I>-1,3-diol of AND with hydrophilically polymerized phenylboronic acid (pPBA). The release of loaded AND was controlled by intracellular conditions, specifically, by low pH and high ATP concentrations, due to the pH- and diol-dependent affinity of the boronic ester. Because of the intrinsic property of the PBA moiety, the pPBA-AND nanoconstruct exhibited an excellent tumor targeting ability both <I>in vitro</I> and <I>in vivo</I>. Finally, a significant inhibition of tumor growth was observed <I>in vivo</I>. Taken together, our strategy, which is based on the formulation of a soluble nanoconstruct using hydrophilically polymerized PBA and a <I>cis</I>-diol, is plausible and provides a delivery system for a wide variety of chemotherapeutics. This strategy has applications not only in cancer therapy but also broader fields such as anti-inflammation or immunotherapy.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Manufacturing of size controlled a-Si:H nanoparticles in plasma using pulsed hydrogen gas.
Kim, Kwangsu,Park, Jinhwan,Doo, Seokgwang,Nam, Jaedo,Kim, Taesung American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.12
<P>We synthesized size controlled a-Si:H nanoparticles in plasma using a hydrogen gas pulse. An inductively-coupled plasma chamber with RF power (13.56 MHz) was designed for this study. Experiments were performed with various hydrogen pulse ON-times ranging between 0.1 to 0.9 seconds for 1 second periods. The size of the synthesized nanoparticles was measured and analyzed using electron microscopy, Scanning Mobility Particle Sizer (SMPS) and Image J software. We observed that the size of a-Si:H nanoparticles decreased when the hydrogen pulse ON-time was increased. The a-Si:H nanoparticles were found to be spherical in shape and uniform. For hydrogen pulse ON-time greater than 0.3 second, we observed agglomerated particles due to an increase in their concentration. We hope that these particles can be used as an alternative anode material for lithium ion secondary batteries.</P>