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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>
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>
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.
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>
Poisson's Ratios of Honeycomb‐Structured Polymer Sheets Under Large Deformation
Kim, Dae‐,Yoon,Kim, Namil,Hwang, Seok‐,Ho,Kuo, Shiao‐,Wei,Lee, Jong‐,Hoon,Lee, Sang‐,A,Lee, Joong Hee,Nah, Changwoon,Jeong, Kwang‐,Un WILEY‐VCH Verlag 2011 Macromolecular Chemistry and Physics Vol.212 No.20
<P><B>Abstract</B></P><P>The mechanical properties of 2D honeycomb‐structured polymer sheets (HSPS) are investigated with respect to the polar angle at large deformation. The tensile force fluctuates as an undamped negative sinusoidal wave with a periodicity of 15°. The amplitude of the fluctuation is proportional to the thickness of the HSPS, but the Young's modulus is independent of the thickness and the polar angle. Total and local Poisson's ratios of HSPS at the 30° polar angle are lower than those obtained at the 0° polar angle over the entire strain range, and the difference becomes smaller with increasing tensile strain. The experimentally observed structure–property relationship of the HSPS can provide important clues for understanding the deformation behavior of patterned polymeric materials.</P>