• Bulletin of the Korean Chemical Society
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• 제33권3호
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• pp.1020-1028
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• 2012

This work compares various models for geminate reversible diffusion influenced reactions. The commonly utilized contact reactivity model (an extension of the Collins-Kimball radiation boundary condition) is augmented here by a volume reactivity model, which extends the celebrated Feynman-Kac equation for irreversible depletion within a reaction sphere. We obtain the exact analytic solution in Laplace space for an initially bound pair, which can dissociate, diffuse or undergo "sticky" recombination. We show that the same expression for the binding probability holds also for "mixed" reaction products. Two different derivations are pursued, yielding seemingly different expressions, which nevertheless coincide numerically. These binding probabilities and their Laplace transforms are compared graphically with those from the contact reactivity model and a previously suggested coarse grained approximation. Mathematically, all these Laplace transforms conform to a single generic equation, in which different reactionless Green's functions, g(s), are incorporated. In most of parameter space the sensitivity to g(s) is not large, so that the binding probabilities for the volume and contact reactivity models are rather similar.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.115.1-115.1
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• 2011

최근 기본적인 pin 구조의 박막 cell 에서 i layer를 최적화 시키는 방안으로 double layer 구조가 많이 연구되고 있다. 본 연구에서는 ASA(Advanced Semicon ductor Analysis) simulation을 이용하여 i-double layer 최적화에 대한 연구를 진행해 보았다. 두께 150/150nm의 i double layer의 band gap 가변을 한 simulation 결과를 보았을 때, p쪽의 band gap이 상승하면서 intrinsic layer 내의 field가 증가하여 recombination center가 감소하였으나 FF의 감소가 있었다. n쪽의 band gap을 상승 시켰을때 n/i 쪽 field 증가로 Voc가 상승되어 초기 효율이 증가하였으나 intrinsic layer내의 field가 감소하여 recombination center가 오히려 증가하였다. 결과적으로 electric field와 효율을 동시에 고려했을 때 두께 300nm, 1.75의 band gap을 가지는 single layer 보다 150/150nm두께에 1.8/1.7 또는 1.8/1.75의 bandgap을 가지는 double layer를 사용하였을 때 보다 높은 효율을 얻을 수 있었다.

• Bulletin of the Korean Chemical Society
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• 제29권12호
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• pp.2449-2452
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• 2008

• Bulletin of the Korean Chemical Society
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• 제34권9호
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• pp.2765-2768
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• 2013

The effect of $TiO_2$ nanorods (TNR) and nanoparticles (TNP) composite photoelectrodes and the role of TNR to enhance the energy conversion efficiency in dye-sensitized solar cells (DSSCs) was investigated. The 5% TNR content into the TNP photoelectrode significantly increased the short-circuit current density ($J_{sc}$) and the open-circuit potential ($V_{oc}$) with the overall energy conversion efficiency enhancement of 13.6% compared to the pure TNP photoelectrode. From the photochemical and impedemetric analysis, the increased $J_{sc}$ and $V_{oc}$ for the 5% TNR/TNP composite photoelectrode was attributed to the scattering effect of TNR, reduced electron diffusion path and the suppression of charge recombination between the composite photoelectrode and electrolyte or dye.

• BMB Reports
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• 제29권5호
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• pp.448-454
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• 1996

Bacteriophage ${\phi}FC1$ is a temperate phage which was identified as a prophage in the Enterococcus faecalis KBL703 chromosome. Phage ${\phi}FC1$ integrates into the host chromosome by site-specific recombination. The phage attachment site P (attP) was localized within the 0.65-kb XhoI-HindIII fragment and the nucleotide sequence of the region was determined. An open reading frame (mj1) which adjoined the phage attachment site encoded a deduced protein related to the site-specific recombinase family. The organization of this region was comparable to other site-specific recombination systems. The molecular weight of the expressed MJ1 in E. coli was in good agreement with the predicted 53,537 Da of the mj1 gene product. Elucidation of the phage-specific integration process in this study would provide useful genetic tools such as a chromosomal integration system.

• Journal of Ecology and Environment
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• 제43권4호
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• pp.421-426
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• 2019

Background: Wolbachia are among the most prevalent endosymbiotic bacteria and induce reproductive anomalies in various invertebrate taxa. The bacterium has huge impacts on host reproductive biology, immunity, evolution, and molecular machinery. However, broad-scale surveys of Wolbachia infections at the order scale, including the order Coleoptera, are limited. In this study, we investigated the Wolbachia infection frequency in 201 Coleopteran insects collected in Korea. Results: A total of 26 species (12.8%) belonging to 11 families harbored Wolbachia. The phylogenetic trees of based on partial 16S rRNA gene sequences and partial Wolbachia surface protein (wsp) gene sequences were largely incongruent to that of their hosts. This result confirms that Wolbachia evolved independently from their hosts, Conclusion: Phylogenetic trees suggest that complex horizontal gene transfer and recombination events occurred within and between divergent Wolbachia subgroups.

• The Plant Pathology Journal
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• 제31권4호
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• pp.388-401
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• 2015

Sweet potatoes (Ipomea batatas L.) are grown extensively, in tropical and temperate regions, and are important food crops worldwide. In Korea, potyviruses, including Sweet potato feathery mottle virus (SPFMV), Sweet potato virus C (SPVC), Sweet potato virus G (SPVG), Sweet potato virus 2 (SPV2), and Sweet potato latent virus (SPLV), have been detected in sweet potato fields at a high (~95%) incidence. In the present work, complete genome sequences of 18 isolates, representing the five potyviruses mentioned above, were compared with previously reported genome sequences. The complete genomes consisted of 10,081 to 10,830 nucleotides, excluding the poly-A tails. Their genomic organizations were typical of the Potyvirus genus, including one target open reading frame coding for a putative polyprotein. Based on phylogenetic analyses and sequence comparisons, the Korean SPFMV isolates belonged to the strains RC and O with >98% nucleotide sequence identity. Korean SPVC isolates had 99% identity to the Japanese isolate SPVC-Bungo and 70% identity to the SPFMV isolates. The Korean SPVG isolates showed 99% identity to the three previously reported SPVG isolates. Korean SPV2 isolates had 97% identity to the SPV2 GWB-2 isolate from the USA. Korean SPLV isolates had a relatively low (88%) nucleotide sequence identity with the Taiwanese SPLV-TW isolates, and they were phylogenetically distantly related to SPFMV isolates. Recombination analysis revealed that possible recombination events occurred in the P1, HC-Pro and NIa-NIb regions of SPFMV and SPLV isolates and these regions were identified as hotspots for recombination in the sweet potato potyviruses.

• 한국안광학회지
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• 제4권2호
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• pp.141-146
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• 1999

단결정 $LaAlO_3$의 열자극발광을 온도, 파장, 발광강도의 3차원 데이터로 측정하였고, 이를 분석하였다. $LaAlO_3$는 YBCO(초전도체) 또는 각종 반도체의 성장기판으로 많이 활용되고 있다. 온도, 파장, 발광강도의 3차원 데이터를 얻으므로써 활성화 에너지 뿐만 아니라, 기존의 온도대 발광곡선(glow curve) 분석에서 그 정보를 알기 힘들었던, 재결합준위(recombination center)의 에너지를 결정할 수 있었다. 이는 특정 피크온도에서의 파장대 발광강도 데이터를 Franck-Condon 모델을 이용하여 곡선 춤법으로 분석하여 얻을 수 있다. 온도대 발광강도곡선(glow curve)을 수치해석에 의한 곡선맞춤법으로 분석한 결과 세 개의 발광곡선이 중첩되어 있음을 알게되었으며, 각각에 대한 활성화 에너지는 0.54eV, 0.91eV, 1.02eV 였다. 재결합준위의 에너지는 2.04eV, 2.75eV 였다.

• 한국식물병리학회:학술대회논문집
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• 한국식물병리학회 2005년도 한국식물병리학회 임시총회 및 춘계학술발표회
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• pp.60-60
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• 2005

• Pediatric Infection and Vaccine
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• 제24권3호
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• pp.134-140
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• 2017

목적: 중증복합면역결핍증(severe combined immunodeficiency [SCID])은 일차면역결핍증 중 가장 심각한 형태의 질병이다. 국내에서 SCID 선별검사를 확립하기 위하여, 신생아에게 T-cell receptor excision circle (TREC)/${\kappa}$-deleting recombination excision circle (KREC) 선별검사를 시행하고, 부모에게 인식도를 조사하였다. 방법: 혈액 검체에서 TREC/KREC을 multiplex 실시간중합효소연쇄반응으로 분석하였다. 부모에게 설문조사를 실시하였다. 결과: 141명의 신생아가 선별검사에 참여하였고, 140명(99.3%)이 첫 검사에서 TREC/KREC 양성이었으며, 한 명(0.7%)은 처음에 음성이었으나, 추후 양성으로 확인되었다. 인식도 조사에는 84% (141/168)는 SCID 선별검사가 국내에서도 시행되어야 한다고 답변했다. 결론: 본 연구에서는 국내에서 처음으로 신생아 SCID 선별검사와 인식도 시행되었으며, SCID 선별검사가 국내 임상에 적용될 수 있을 것으로 보인다.