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Kim, Dae-Yoon,Lee, Sang-A,Kim, Huisu,Min Kim, Soo,Kim, Namil,Jeong, Kwang-Un The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.55
<P>By considering intramolecular conformations and intermolecular interactions, an azobenzene-based photochromic liquid crystalline amphiphile is synthesized for demonstrating a remote-controllable light shutter by the photo-induced isothermal phase transition between the highly ordered crystal phase and the isotropic liquid phase.</P> <P>Graphic Abstract</P><P>By considering intramolecular conformations and intermolecular interactions, a photochromic liquid crystalline amphiphile is synthesized for a remote-controllable light shutter. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cc02834e'> </P>
A New Function of Skp1 in the Mitotic Exit of Budding Yeast Saccharomyces cerevisiae
Namil Kim,Hayoung Yoon,Eunhwa Lee,Kiwon Song 한국미생물학회 2006 The journal of microbiology Vol.44 No.6
We previously reported that Skp1, a component of the Skp1-Cullin-F-box protein (SCF) complex essential for the timely degradation of cell cycle proteins by ubiquitination, physically interacts with Bfa1, which is a key negative regulator of the mitotic exit network (MEN) in response to diverse checkpoint-activating stresses in budding yeast. In this study, we initially investigated whether the interaction of Skp1 and Bfa1 is involved in the regulation of the Bfa1 protein level during the cell cycle, especially by mediating its degradation. However, the profile of the Bfa1 protein did not change during the cell cycle in skp1-11, which is a SKP1 mutant allele in which the function of Skp1 as a part of SCF is completely impaired, thus indicating that Skp1 does not affect the degradation of Bfa1. On the other hand, we found that the skp1-12 mutant allele, previously reported to block G2-M transition, showed defects in mitotic exit and cytokinesis. The skp1-12 mutant allele also revealed a specific genetic interaction with Δbfa1. Bfa1 interacted with Skp1 via its 184 C-terminal residues (Bfa1-D8) that are responsible for its function in mitotic exit. In addition, the interaction between Bfa1 and the Skp1-12 mutant protein was stronger than that of Bfa1 and the wild type Skp1. We suggest a novel function of Skp1 in mitotic exit and cytokinesis, independent of its function as a part of the SCF complex. The interaction of Skp1 and Bfa1 may contribute to the function of Skp1 in the mitotic exit.
Kim, Namil,Kim, Wonjoon Elsevier 2018 INTERNATIONAL JOURNAL OF INFORMATION MANAGEMENT - Vol.39 No.-
<P><B>Abstract</B></P> <P>The advent of social commerce has resulted in a new business model for e-commerce. Although studies on this business model have increased over time, they have paid less attention to its core business model: consumer-generated social influence on sales on a social commerce site. Therefore, in this paper, we examine the effect on sales of social sharing, such as Facebook “likes” and Twitter tweets, which generate social influence, using data from major social commerce companies. We find that consumer-generated social referrals regarding deals significantly boost sales in social commerce. When we examine deals involved in national sales, this finding holds only for Facebook but not for tweets. These findings have the implication for managers that not all social referrals are meaningful in increasing sales for their business.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This paper examines the core business model for social commerce business. </LI> <LI> We examine the effect on sales of social sharing, such as Facebook “likes” and Twitter tweets. </LI> <LI> However, deals involved in national sales, this finding holds only for Facebook but not for tweets. </LI> </UL> </P>
Macroscopically oriented hierarchical structure of the amphiphilic tetrathiafulvalene molecule
Kim, Namil,Wang, Lei,Kim, Dae-Yoon,Hwang, Seok-Ho,Kuo, Shiao-Wei,Lee, Myong-Hoon,Jeong, Kwang-Un The Royal Society of Chemistry 2012 Soft matter Vol.8 No.35
<P>Since the physical properties of electronic and biological molecules strongly depend on the nature of molecular self-assembly and organization, it is essential to control their molecular packing structure and morphology on the different length scales. In this aspect, a programmed amphiphilic tetrathiafulvalene (TTF) molecule (abbreviated as amph-7TTF14) was newly designed and synthesized. Differential scanning calorimetry (DSC) combined with one-dimensional (1D) wide angle X-ray diffraction (WAXD) techniques revealed that a highly ordered crystalline phase emerged below the isotropic phase. From the 2D WAXD pattern of the macroscopically oriented amph-7TTF14 film, the crystal structure was identified to be a monoclinic unit cell. The face-to-face π–π interaction between TTF groups and the nanophase separation between rigid TTF groups and flexible hydrophobic alkyl and hydrophilic tri(ethylene oxide) tails were the main driving forces for the self-assembly of amph-7TTF14. The morphological observations using transmission electron microscopy (TEM), atomic force microscopy (AFM), and polarized optical microscopy (POM) indicated that the amph-7TTF14 formed not only flat ribbons but also scrolls and helixes, in which the ribbons further aggregated to create the fibrous hierarchical structures. Based on the experimental results and careful analyses, it was realized that the scrolls and helices were induced by the unbalanced surface stresses generated during the crystallization process. When the macroscopically oriented fibrous hierarchical structure is properly applied to the electrooptical and bio-mimetic devices, the targeted physical properties may be significantly improved and tuned for the specific practical applications.</P> <P>Graphic Abstract</P><P>Amphiphilic TTF molecule forms not only flat but also scrolled and helical ribbons which further aggregate themselves to create the fibrous hierarchical structures. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2sm26458g'> </P>
Performances of Plastic Pulley with High Mechanical Properties and Low Friction
( Namil Kim ),( Jung-seok Lee ),( Byung-kook Hwang ),( Seokhu Bae ),( Jeong-hwan Yoon ),( Juho Yun ) 한국고무학회 2019 엘라스토머 및 콤포지트 Vol.54 No.2
Polyphenylene sulfide (PPS) was filled with glass fiber (GF), aramid fiber (AF), and solid lubricants to improve the mechanical properties and wear resistance. The addition of GF effectively enhanced the tensile strength, flexural modulus, and impact strength of PPS, while solid lubricants such as polytetrafluoroethylene (PTFE), molybdenum disulfide (MoS<sub>2</sub>), and tungsten disulfide (WS<sub>2</sub>) lowered the friction coefficients of the composites to below 0.3. The ball nut and motor pulley of the electric power steering (EPS) were manufactured using the PPS composites, and feasibility was ascertained thereafter by conducting the durability test. The composites filled with GF and AF showed high mechanical strength, but slip occurred at the interface between the pulley and belt while testing above 50°C. When small amounts of lubricants were added, the slip was no longer detected because of the suppression of friction heat. It is realized that the low friction as well as high mechanical properties is important to ensure the reliability of plastic pulleys.
Kim, Dae-Yoon,Park, Minwook,Lee, Sang-A,Kim, Soeun,Hsu, Chih-Hao,Kim, Namil,Kuo, Shiao-Wei,Yoon, Tae-Ho,Jeong, Kwang-Un The Royal Society of Chemistry 2015 SOFT MATTER Vol.11 No.1
<P>Unconventional star-shaped liquid crystals (abbreviated as SiLCs) were successfully synthesized by chemically connecting four cyanobiphenyl anisotropic mesogens to the periphery of a super-hydrophobic and ultra-flexible cyclic tetramethyltetrasiloxane ring with flexible hexyl chains. Based on the combined experimental techniques of differential scanning calorimetry (DSC), cross-polarized optical microscopy (POM), solid-state carbon-13 (<SUP>13</SUP>C) nuclear magnetic resonance (NMR) spectroscopy and one-dimensional (1D) wide-angle X-ray diffraction (WAXD), it was found that the SiLC molecule exhibited the monotropic phase transition from a LC phase to a crystalline phase. The crystalline phase was only detected during slow heating processes above its glass transition temperature, while a LC phase was formed both during cooling and during heating processes. The hierarchical superstructures were identified from the structure-sensitive 2D WAXD of the macroscopically oriented SiLC film and confirmed by selected area electron diffraction (SAED) of the SiLC single crystals. The molecular packing symmetry in the monoclinic unit cell was further investigated by computer simulations on the real and reciprocal spaces. Macroscopically oriented SiLC hierarchical superstructures on the different length scales may provide the targeted physical properties, which can allow us to apply SiLC molecules in the fields of electro-optical devices and nonlinear optics.</P> <P>Graphic Abstract</P><P>A star-shaped molecule synthesized by connecting four cyanobiphenyl mesogens to the periphery of a super-hydrophobic and ultra-flexible cyclic siloxane ring with hexyl chains formed hierarchical layered superstructures. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4sm02239d'> </P>