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Characteristics of composite images in multiview imaging and integral photography
Lee, Beom-Ryeol,Hwang, Jae-Jeong,Son, Jung-Young The Optical Society 2012 Applied optics Vol.51 No.21
<P>The compositions of images projected to a viewer's eyes from the various viewing regions of the viewing zone formed in one-dimensional integral photography (IP) and multiview imaging (MV) are identified. These compositions indicate that they are made up of pieces from different view images. Comparisons of the composite images with images composited at various regions of imaging space formed by camera arrays for multiview image acquisition reveal that the composite images do not involve any scene folding in the central viewing zone for either MV or IP. However, in the IP case, compositions from neighboring viewing regions aligned in the horizontal direction have reversed disparities, but in the viewing regions between the central and side viewing zones, no reversed disparities are expected. However, MV does exhibit them.</P>
Kyeong-Ryeol Lee,Kong Sik Shin,Seok Cheol Suh,Ki Young Kim,Yong Hee Jeon,Beom Seok Park,김주곤,Soon-Jong Kweon,Yeon-Hee Lee 한국식물생명공학회 2009 Plant biotechnology reports Vol.3 No.4
The insecticidal toxin gene of Bacillus thuringiensis (Bt) is one of the most commonly used in the development of genetically modified (GM) crops. In this research, we analyzed Bt rice showing lepidopteran pestresistance. The Bt gene is a synthetic Cry1Ac composed of optimal codons for plants, and the Bt protein is targeted to the chloroplast by a transit peptide. Three Cry1Ac rice events (C103-3, C127-1, and C7-1) were analyzed for molecular characterization. C103-3 contains two copies of T-DNA where the left border (LB) region is truncated. Both C7-1 and C127-1 have a single copy of T-DNA, but a part of the vector backbone DNA is inserted into the genome of C127-1; thus, only C7-1 had intact T-DNA. Progenies of C7-1 crossed with the original cultivar, Nakdong, and double-haploid lines from anther culture of lines crossed with the elite cultivar, Dongjin, were analyzed for T-DNA flanking genomic DNA and genotyping. Results showed that an intact T-DNA region without the vector backbone was inserted into the genome and was stably inherited through generations. The C7-1 homozygous event could be used as breeding material to develop GM rice with pest resistance.
효율적인 웹 정보검색시스템을 위한 요구사항 정의 및 구현 기법
이범석(Beom Seok Lee),윤범렬(Beom Ryeol Yoon),김수동(Soo Dong Kim),류성열(Sung Yul Rhew) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅰ
인터넷 상에서 끊임없이 증가하고 있는 방대한 양의 정보를 검색하기 위하여 많은 정보 검색 시스템들이 나타나게 되었다. 그러나 기존의 정보검색 시스템에서 사용자는 검색시스템이 검색한 수많은 문서들을 하나씩 받아오게 됨으로 정보검색 시간이 많이 걸리게 된다. 또 인터넷 사용자들의 사용시간이 특정 시간대에 집중되게 되어 네트웍의 부하가 커지는 것 역시 정보검색의 시간이 늘어나는 원인이 된다. 또한 사용자는 단순히 키워드 입력 방식으로 검색하게 되므로 다양한 사용자의 검색요구를 적절히 만족시키지 못하게 된다. 본 논문은 이런 문제점들을 보완하는 좀 더 효율적인 정보 검색시스템을 구축하기 위해 필요한 요구사항을 크게 4가지로 정의해 보고 이 요구사항을 만족시키기 위한 기법을 제시하고자 한다.
Byung Moo Lee,Heung Ryeol You,Hyun Beom Lee,Jung Joon Kim,Sang Hong Lee 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
Adjacent channel interference is one of se-rious problems in wireless communication systems, and various researchers have been analyzed and/or developed related technologies to avoid and/or suppress it. In future wireless communication technologies, flexible communi-cations, like congitive radio, would be one of main trends. In this situation, simple and fast analysis of adjacent chan-nel interference gives a lot of benefit, because it makes real-time parameter adjustment possible to cope with flex-ible communications. Keeping this in mind, in this paper, we present simple BER perforamance analysis of adjacent channel interference. We regard adjacent channel inter-ference as AWGN and simply add with another AWGN, communication noise. Obviously adjacent channel inter-ference is also affected by fading channel, like transmit signal. We show that, in Rayleigh fading channelwith zero mean and unit variance, we don’t need to concern about fading of adjacent channel interference. The validity of our analysis is tested by simulations.
Lee, Seong-Kon,Kim, Beom-Gi,Kwon, Taek-Ryoun,Jeong, Mi-Jeong,Park, Sang-Ryeol,Lee, Jung-Won,Byun, Myung-Ok,Kwon, Hawk-Bin,Matthews, Benjamin F,Hong, Choo-Bong,Park, Soo-Chul Indian Academy of Sciences 2011 Journal of biosciences Vol.36 No.1
<P>Mitogen-activated protein kinases (MAPK) signalling cascades are activated by extracellular stimuli such as environmental stresses and pathogens in higher eukaryotic plants. To know more about MAPK signalling in plants, aMAPK cDNA clone, OsMAPK33, was isolated from rice. The gene is mainly induced by drought stress. In phylogenetic analysis, OsMAPK33 (Os02g0148100) showed approximately 47-93% identity at the amino acid level with other plant MAPKs. It was found to exhibit organ-specific expression with relatively higher expression in leaves as compared with roots or stems, and to exist as a single copy in the rice genome. To investigate the biological functions of OsMAPK33 in rice MAPK signalling, transgenic rice plants that either overexpressed or suppressed OsMAPK33 were made. Under dehydration conditions, the suppressed lines showed lower osmotic potential compared with that of wild-type plants, suggesting a role of OsMAPK33 in osmotic homeostasis. Nonetheless, the suppressed lines did not display any significant difference in drought tolerance compared with their wild-type plants. With increased salinity, there was still no difference in salt tolerance between OsMAPK33-suppressed lines and their wild-type plants. However, the overexpressing lines showed greater reduction in biomass accumulation and higher sodium uptake into cells, resulting in a lower K+/Na+ ratio inside the cell than that in the wild-type plants and OsMAPK33-suppressed lines. These results suggest that OsMAPK33 could play a negative role in salt tolerance through unfavourable ion homeostasis. Gene expression profiling of OsMAPK33 transgenic lines through rice DNA chip analysis showed that OsMAPK33 altered expression of genes involved in ion transport. Further characterization of downstream components will elucidate various biological functions of this novel rice MAPK.</P>
Lee, Min Seok,Whang, Dong Ryeol,Choi, Hyun-Jung,Yang, Mun Ho,Kim, Bong-Gi,Baek, Jong-Beom,Chang, Dong Wook Elsevier 2017 Carbon Vol.122 No.-
<P>report efficient modulation of the electrocatalytic activity of imine-rich nitrogen-doped graphene nanosheets (IRnGs) in the oxygen reduction reaction (ORR) by chemical functionalization. IRnGs are prepared by a simple acid-catalyzed dehydration reaction between graphene oxide and aniline derivatives. Various electron-donating and electron-withdrawing substituents are introduced in the para-position of aniline to afford diverse IRnG electrocatalysts. Cyclic voltammetry and rotating ring disk electrode measurements show that the electrocatalytic activity of IRnGs for ORR is highly sensitive to the electronic characteristics of functionalities present in their chemical structures. Thus, the above ORR activities are significantly improved by increasing the electron-withdrawing capability of substituents, since this promotes the beneficial polarization of electrocatalytically active imine bond (-C=N-) in IRnGs. In addition, metal-free IRnGs electrocatalysts offer additional advantages of high selectivity, good long-term stability and excellent tolerance to methanol crossover for ORR in alkaline solution. (C) 2017 Elsevier Ltd. All rights reserved.</P>
Lee, Hwa Sung,Kang, Moon Sung,Kang, Sung Kyung,Kim, Beom Joon,Yoo, Youngjae,Lim, Ho Sun,Um, Soong Ho,Ryu, Du Yeol,Lee, Dong Ryeol,Cho, Jeong Ho American Chemical Society 2012 The Journal of Physical Chemistry Part C Vol.116 No.41
<P>We demonstrated that the viscoelasticity of a dielectric surface affected the overlying pentacene crystalline nanostructures and the electrical performances of pentacene-based field-effect transistors (FETs). The surface viscoelasticities of the gate dielectrics were systematically controlled by varying the polymer chain lengths of polystyrene brushes (<I>b</I>-PSs) and the substrate temperature during pentacene deposition. The <I>b</I>-PSs were chosen as a model surface because the glass–liquid transition affected neither the surface energy nor the surface roughness. Moreover, the glass–liquid transition temperature increased with increasing <I>b</I>-PS chain length. The liquid-like <I>b</I>-PS chains disturbed the surface arrangement of the pentacene molecules, which reduced the organization of the crystalline structures, yielding smaller grains during the early stages of pentacene growth. The dramatic changes in the film morphology and crystalline nanostructures above the <I>b</I>-PS glass–liquid transition resulted in noticeable changes in the OFET performance. The systematic investigation of the dielectric surface viscoelasticity presented here provides a significant step toward optimizing the nanostructures of organic semiconductors, and thereby, the device performance, by engineering the interfaces in the OFETs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2012/jpccck.2012.116.issue-41/jp305820r/production/images/medium/jp-2012-05820r_0007.gif'></P>