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Branch-Line Slit 을 갖는 이중 대역 PIFA의 설계 및 제작
장수영,윤진호,김보미,김석현,이영순 금오공과대학교 2005 論文集 Vol.26 No.-
A PIFA(Planar Inverted-F Antenna) which can be used in GSM/IXS dual band mobile phone has been designed and fabricated. In particular, in order to reduce the required top patch dimensions, the patch of the present PIFA has been designed as a type of an asymmetric branch line slit in which the excited patch surface currents can be meandered. By use of the HFSS, important design parameters such as the position of feed point and the length of slit were simulated and determined. In the present study, the design procedure by which the exact operating frequency and the proper band width can be obtained, are discussed. In order to check the validity of the present study, some simulated and measured results are presented.
Jang, Bo Yun,Kim, Ja Young,Seo, Gyeongju,Shin, Chae-Ho,Ko, Chang Hyun American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.1
<P>The thermal behavior of silicon nanoparticles (Si NPs) was investigated for the preparation of silicon thin film using a solution process. TEM analysis of Si NPs, synthesized by inductively coupled plasma, revealed that the micro-structure of the Si NPs was amorphous and that the Si NPs had melted and merged at a comparatively low temperature (similar to 750 degrees C) considering bulk melting temperature of silicon (1414 degrees C). A silicon ink solution was prepared by dispersing amorphous Si NPs in propylene glycol (PG). It was then coated onto a silicon wafer and a quartz plate to form a thin film. These films were annealed in a vacuum or in an N-2 environment to increase their film density. N-2 annealing at 800 degrees C and 1000 degrees C induced the crystallization of the amorphous thin film. An elemental analysis by the SIMS depth profile showed that N-2 annealing at 1000 degrees C for 180 min drastically reduced the concentrations of carbon and oxygen inside the silicon thin film. These results indicate that silicon ink prepared using amorphous Si NPs in PG can serve as a proper means of preparing silicon thin film via solution process.</P>
Development of a Simple Cell Lysis Method for Recombinant DNA Using Bacteriophage Lambda Lysis Genes
Jang, Bo-Yun,Jung, Yun-A,Lim, Dong-Bin The Microbiological Society of Korea 2007 The journal of microbiology Vol.45 No.6
In this study, we describe the development of a simple and efficient method for cell lysis via the insertion of a bacteriophage lambda lysis gene cluster into the pET22b expression vector in the following order; the T7 promoter, a gene for a target protein intended for production, Sam7 and R. This insertion of R and Sam7 into pET22b exerted no detrimental effects on cellular growth or the production of a target protein. The induction of the T7 promoter did not in itself result in the autolysis of cells in culture but the harvested cells were readily broken by freezing and thawing. We compared the efficiency of the cell lysis technique by freezing and thawing to that observed with sonication, and determined that both methods completely disintegrated the cells and released proteins into the solution. With our modification of pET22b, the lysis of cells became quite simple, efficient, and reliable. This strategy may prove useful for a broad variety of applications, particularly in experiments requiring extensive cell breakage, including library screening and culture condition exploration, in addition to protein purification.
Luminescence properties of Eu2O3-doped Ca2Si5N8 phosphors
Bo Yun Jang,Joo Seok Park 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.6
Using Eu2O3 to dope, Eu2+-activated Ca2Si5N8 phosphors were synthesized and their luminescence properties were investigated. Dark yellow and orange day-light-colored phosphors were achieved with broad and high absorption in the ultra violet (UV)/ visible range of 300-550 nm. The photoluminescence characteristics with various Eu2+-doping concentrations were observed. The oxidation from Eu2O3 influenced not only emission but also the excitation spectra of the phosphors. Broad band emissions were achieved and the strongest peak positions were shifted from 588 to 613 nm with an increase of the dopant, Eu2O3 concentration. A large emission tunability and a high solubility of activators-h absorption in the UV range and broad red emission make phosphors in this study excellent candidates for UV-light emitting diode (LED) conversion phosphors. Using Eu2O3 to dope, Eu2+-activated Ca2Si5N8 phosphors were synthesized and their luminescence properties were investigated. Dark yellow and orange day-light-colored phosphors were achieved with broad and high absorption in the ultra violet (UV)/ visible range of 300-550 nm. The photoluminescence characteristics with various Eu2+-doping concentrations were observed. The oxidation from Eu2O3 influenced not only emission but also the excitation spectra of the phosphors. Broad band emissions were achieved and the strongest peak positions were shifted from 588 to 613 nm with an increase of the dopant, Eu2O3 concentration. A large emission tunability and a high solubility of activators-h absorption in the UV range and broad red emission make phosphors in this study excellent candidates for UV-light emitting diode (LED) conversion phosphors.
Crystal Structures and Luminescence Properties of AlN-deficient Eu2+-activated Ca-??-SiAlON Phosphor
Jang, Bo Yun,Park, Sung Soon,Park, Joo Seok,Nahm, Shan Korean Physical Society 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.4
<P>Eu2+-doped Ca-alpha-SiAlON phosphor was synthesized by normal pressure sintering with conventional tube furnace, and its crystal structures and luminescence properties were investigated. Eu2+-doped Ca-alpha-SiAlON phosphor exhibited an orange light peaking at 583 nm. During the annealing, some of the raw materials evaporated, which resulted in unreacted AlN in the final product. In order to obtain a final product with a single alpha-phase, we prepared samples with various AIN-deficient compositions, and we studied the effects on crystal structures and luminescence properties. For the sample with 15 mol% AlN-deficient composition, 18% enhancement of the intensity was obtained with the disappearance of excess AIN. In addition, the internal quantum efficiency (IQE) was measured using a specially designed integrating sphere, and 56.82% IQE was gained from Eu2+-doped Ca-alpha-SiAlON phosphor.</P>
Role of <i>Drosophila</i> EDEMs in the degradation of the alpha-1-antitrypsin Z variant
JANG, BO-YUN,RYOO, HYUNG DON,SON, JAEKYOUNG,CHOI, KYUNG-CHUL,SHIN, DONG-MYOUNG,KANG, SANG-WOOK,KANG, MIN-JI UNKNOWN 2015 INTERNATIONAL JOURNAL OF MOLECULAR MEDICINE Vol.35 No.4
<P>The synthesis of proteins in the endoplasmic reticulum (ER) that exceeds the protein folding capacity of this organelle is a frequent cause of cellular dysfunction and disease. An example of such a disease is alpha-1-antitrypsin (A1AT) deficiency, caused by destabilizing mutations in this glycoprotein. It is considered that the mutant proteins are recognized in the ER by lectins and are subsequently degraded through the proteasome, leading to a deficiency in this enzyme in the afflicted patients. We previously established a <I>Drosophila</I> model of this disease by overexpressing the null Hong Kong (NHK) allele of this gene and found that the <I>Drosophila</I> lectin, ER degradation-enhancing α-mannosidase-like protein 2 (EDEM2), can accelerate the degradation of A1AT when overexpressed. NHK is a rare allele, and in this study, we investigated in depth the mechanisms through which <I>Drosophila</I> EDEMs affect the degradation of the Z variant, which is the predominant disease allele. Specifically, we report that the Z allele does not activate ER stress signaling as prominently as the NHK allele, but similarly requires both <I>Drosophila</I> EDEM1 and EDEM2 for the degradation of the protein. We demonstrate that EDEMs are required for their ubiquitination, and without EDEMs, glycosylated A1AT mutants accumulate in cells. These results support the role of the EDEM-mediated ubiquitination of the alpha-1-antitrypsin Z (ATZ) allele, and establish a <I>Drosophila</I> model for the study of this protein and disease.</P>