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서태건(Seo Taegun),김석현(Kim Seockhyun),김정태(Kim Jeong-tae),송달호(Song Dalho) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Recently, aluminium extruded panel is widely used in a high speed train for increasing bending stiffness and weight reduction. This aluminium extruded panel shows the largest contribution in the sound transmission loss (TL) of the floor and side wall. However, comparing with the flat panel having the same weight, TL of the aluminium extruded panel falls remarkably around the local resonance frequency, which is determined by the dimension of the core structure. In this study, we try to change the local resonance frequency by modifying the core structure. Increasing or decreasing the thickness, angle and span in the core, change of the local resonance frequency and change of the overall natural frequency are investigated by finite element analysis, and effect of local resonance on TL is examined. The purpose of the study is to design more effective core structure for the sound insulation performance of the aluminium extruded panel.
서태건(Taegun Seo),김석현(Seokhyun Kim),김정태(Jung-tae Kim),김재철(Jaecheol Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
In a railway vehicle, corrugated steel panel is widely used for the floor structure because of its high bending stiffness and light weight. However, this panel shows lower sound insulation performance than that of the plate with the same weight. Especially, in a particular frequency region, transmission loss (TL) rapidly decreases and it results in the deterioration of TL of the overall floor structure. This study identifies that the remarkable drop in TL is caused from the local resonance of the periodic corrugated structure. The reason of the TL drop is investigated by experiment and finite element analysis. In addition, improvement effect of TL by the design modification of the corrugation is estimated by experiment. The purpose of the study is to provide the practical information for the improvement of the sound insulation performance of the corrugated steel.
서태건(Taegun Seo),김석현(Seockhyun Kim),김정태(Jeong-tae Kim),송달호(Dalho Song) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Aluminium extruded panel is the most important element for sound insulation in a express train. However, comparing with the flat plate with the same weight, the extruded panel shows remarkably low sound transmission loss above the 1st local resonance frequency, which is determined by the dimension of the core structure. Preceding study showed the possibility of the improvement of sound insulation performance by properly designing the core dimension. By the proper core design, local resonance frequency shifts to higher frequency region without any reduction of bending or torsional strength and without any weight increase. Based upon this result, this study investigates in detail the design modification of the core structure of the aluminium extruded panel used in a express train under development, in aspect of sound insulation. Design result is compared with those of other developed models.
서태건(Taegun Seo),김석현(Seockhyun Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In a Korean tilting train, honeycomb composite panel is used for high speed and light weight. Side wall of the tilting train consists of the aluminum honeycomb coated with carbon fiber reinforced epoxy skin as the main structure. In this study, based on ASTM E2249-02, we measure the intensity sound transmission loss (TL) of the honeycomb composite panel. Using mass law deviation (MLD), we estimate the sound insulation performance of the honeycomb composite panels in aspect of weight and feel out the feasibility of the substitution for the conventional corrugated steel panel.
hSNF5 Is Required for Human Papillomavirus E2-Driven Transcriptional Activation and DNA Replication
Cha, Seho,Seo, Taegun S. Karger AG 2011 Intervirology Vol.54 No.2
<abstitle>Abstract</abstitle><P><I>Objective:</I> To determine the participation of the SWI/SNF complex in the transcription and replication of human papillomavirus (HPV) E2 protein. <I>Method:</I> We checked the interaction between hSNF5 and HPV E2 through glutathione S-transferase (GST) pull-down and coimmunoprecipitation assays. The transcriptional activation of E2 was analyzed by reporter assay and the level of HPV DNA replication was determined by a transient DNA replication assay. <I>Results:</I> We demonstrated that hSNF5 binds to the HPV E2 protein in vivo and in vitro and activates E2-dependent viral transcription. SWI/SNF components enhanced E2-dependent viral transcription. The ATPase activity of BRG-1/hSNF2 was required for efficient E2-dependent transcriptional activation. Transient DNA replication assays showed that hSNF5 and BRG-1 enhance HPV-18 DNA replication in vivo. A dominant negative hSNF5 and a BRG-1 ATPase mutant each repressed E2-dependent viral transcription and E2-driven HPV DNA replication in vivo. The fact that the transcriptional activation function of HPV-18 E2 was defective in the SNF5 knockout strains of the yeast <I>Saccharomyces cerevisiae</I> implies that the SWI/SNF complex is required for the transcriptional activation function of E2. <I>Conclusion:</I> These results suggest that the SWI/SNF complex is involved in HPV E2-driven transcription and DNA replication via interaction with E2.</P><P>Copyright © 2010 S. Karger AG, Basel</P>
Park, Junsoo,Seo, Taegun,Kim, Hakzoo,Choe, Joonho American Society for Microbiology 2005 Molecular and cellular biology Vol.25 No.18
<B>ABSTRACT</B><P>Replication protein A (RPA) is a single-stranded-DNA-binding protein composed of three subunits with molecular masses of 70, 32, and 14 kDa. The protein is involved in multiple processes of eukaryotic DNA metabolism, including DNA replication, repair, and recombination. In <I>Xenopus</I>, <I>Xenopus</I> RPA-interacting protein α has been identified as a carrier molecule of RPA into the nucleus. In this study, human RPA-interacting protein α (hRIPα) and five novel splice isoforms (named hRIPα, hRIPβ, hRIPγ, hRIPδ1, hRIPδ2, and hRIPδ3 according to the lengths of their encoding peptides) were cloned. Among hRIP isoforms, hRIPα and hRIPβ were found to be the major splice isoforms and to show different subcellular localizations. While hRIPα localized to the cytoplasm, hRIPβ was found in the PML nuclear body. Modification of hRIPβ by sumoylation was found to be required for localization to the PML nuclear body. The results of the present work demonstrate that hRIPβ transports RPA into the PML nuclear body and releases RPA upon UV irradiation. hRIPβ thus plays an important role in RPA deposition in PML nuclear bodies and thereby supplements RPA for DNA metabolism.</P>