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A 2.4 /5.2-㎓ Dual Band CMOS VCO using Balanced Frequency Doubler with Gate Bias Matching Network
Sung-Sun Choi,Han-Yeol Yu,Yong-Hoon Kim 대한전자공학회 2009 Journal of semiconductor technology and science Vol.9 No.4
This paper presents the design and measurement of a 2.4/5.2-㎓ dual band VCO with a balanced frequency doubler in 0.18 ㎛ CMOS process. The topology of a 2.4 ㎓ VCO is a cross-coupled VCO with a LC tank and the frequency of the VCO is doubled by a frequency balanced doubler for a 5.2 ㎓ VCO. The gate bias matching network for class B operation in the balanced doubler is adopted to obtain as much power at 2nd harmonic output as possible. The average output powers of the 2.4 ㎓ and 5.2 ㎓ VCOs are -12 ㏈m and -13 ㏈m, respectively, the doubled VCO has fundamental harmonic suppression of -25 ㏈. The measured phase noises at 5 ㎒ frequency offset are -123 ㏈c /㎐ from 2.6 ㎓ and -118 ㏈c /㎐ from 5.1 ㎓. The total size of the dual band VCO is 1.0 ㎜×0.9 ㎜ including pads.
Yu, Sung-Lim,Kang, Mi-Sun,Kim, Ho-Yeol,Lee, Sung-Haeng,Lee, Sung-Keun THE KOREAN SOCIETY OF TOXICOGENOMICS AND TOXICOPRP 2011 MOLECULAR AND CELLULAR TOXICOLOGY Vol. No.
Yeast $RAD2$, a counterpart of human $XPG$, is an essential gene for nucleotide excision repair. Rad2p is an endonuclease that incises the 3' side of a DNA damaged lesion. However, over-expression of Rad2p provokes cell growth arrest, resulting in mitotic catastrophe as evidenced by formation of enlarged cells and micro-nucleation. Interestingly, the effect of Rad2p on cell growth arrest is not caused by its endonuclease activity, and it has been suggested that Rad2p might be involved in cell cycle regulation. Mitotic catastrophe mainly results in cell death but also functions as a survival mechanism. Using $RAD2$, we show that some yeast cells growth-arrested by Rad2p-induced mitotic catastrophe regain their ability to proliferate mainly because some Rad2p-induced polyploid cells produce haploid cells with normal cell cycles. Rad2p over-expression also causes increased mutagenesis and the cells with recovered proliferative ability exhibit increased genomic instability, which in turn decreases Rad2p expression. From these results it is inferred that Rad2p-induced polyploid cells undergo increased genetic rearrangement resulting in production of haploid cells.
Effect of Carrier Diffusion on the Electrical Properties of Si-Zn-Sn-O/Ag/Si-Zn-Sn-O Multilayers
Yu, Jiao Long,Lee, Sang Yeol The Korean Institute of Electrical and Electronic 2018 Transactions on Electrical and Electronic Material Vol.19 No.3
Typically, a parallel circuit model is used to explain the electrical resistivity of oxide-metal-oxide (OMO) multilayers; such a model treats the top, middle, and bottom sublayers independently. However, in the case of semiconductor-metal-semiconductor multilayer systems, this model is not applicable; according to the theory of metal-semiconductor contact, carrier diffusion arising from the difference in the work functions of the materials should also be considered. In this paper, we investigate the effect of carrier diffusion on the electrical properties by changing the thickness of both the top and bottom oxide layers. We find that adjusting the thickness of the oxide sublayers realizes direct control of the carrier density in OMO multilayers.
Yu, Eui-Sang,Lee, Sin-Hyung,Bae, Young-Gyu,Choi, Jaebin,Lee, Donggeun,Kim, Chulki,Lee, Taikjin,Lee, Seung-Yeol,Lee, Sin-Doo,Ryu, Yong-Sang American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.44
<P>A liquid-permeable concept in a metal-insulator-metal (MIM) structure is proposed to achieve highly sensitive color-tuning property through the change of the effective refractive index of the dielectric insulator layer. A semicontinuous top metal film with nanoapertures, adopted as a transreflective layer for MIM resonator, allows to tailor the nanomorphology of a dielectric layer through selective etching of the underneath insulator layer, resulting in nanopillars and hollow voids in the insulator layer. By allowing outer mediums to enter into the hollow voids of the dielectric layer, such liquid-permeable MIM architecture enables to achieve the wavelength shift as large as 323.5 nm/RIU in the visible range, which is the largest wavelength shift reported so far. Our liquid-permeable approaches indeed provide dramatic color tunablility, a real-time sensing scheme, long-term durability, and reproducibility in a simple and scalable manner.</P> [FIG OMISSION]</BR>
Effect of Thermal Annealing on the Optical Properties of In—Si—O/Ag/In—Si—O Multilayer
Yu, Jiao Long,Lee, Sang Yeol American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.5
<P>Low emissive transparent multilayers were fabricated with amorphous Si-doped indium oxide (ISO) transparent semiconductor and metallic Ag by Ag thickness. High transmittance in the visible range of the as-deposit ISO/Ag/ISO multilayer was verified in the experiment results, and the optical properties of an oxide-metal-oxide tri-layer were sensitive to the silver layer's thickness. After annealing, the transmittance in the visible range increased by over 10%, and low emissivity for infrared was maintained.</P>
Yu, Sung-Lim,An, Yong Jin,Yang, Hey-ji,Kang, Mi-Sun,Kim, Ho-Yeol,Wen, He,Jin, Xing,Kwon, Hyuk Nam,Min, Kyung-Jin,Lee, Sung-Keun,Park, Sunghyouk American Chemical Society 2013 JOURNAL OF PROTEOME RESEARCH Vol.12 No.4
<P>Alterations in metabolic pathways are gaining attention as important environmental factors affecting life span, but the determination of specific metabolic pathways and enzymes involved in life span remains largely unexplored. By applying an NMR-based metabolomics approach to a calorie-restricted yeast (<I>Saccharomyces cerevisiae</I>) model, we found that alanine level is inversely correlated with yeast chronological life span. The involvement of the alanine-metabolizing pathway in the life span was tested using a deletion mutant of <I>ALT1</I>, the gene for a key alanine-metabolizing enzyme. The mutant exhibited increased endogenous alanine level and much shorter life span, demonstrating the importance of <I>ALT1</I> and alanine metabolic pathways in the life span. <I>ALT1</I>’s effect on life span was independent of the TOR pathway, as revealed by a <I>tor1</I> deletion mutant. Further mechanistic studies showed that <I>alt1</I> deletion suppresses cytochrome <I>c</I> oxidase subunit 2 expression, ultimately generating reactive oxygen species. Overall, <I>ALT1</I> seems critical in determining yeast life span, and our approach should be useful for the mechanistic studies of life span determinations.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jprobs/2013/jprobs.2013.12.issue-4/pr300979r/production/images/medium/pr-2012-00979r_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/pr300979r'>ACS Electronic Supporting Info</A></P>