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Guojun Chen,Jun-Koo Kang,Jin-Mo Kim 한국재무학회 2010 한국재무학회 학술대회 Vol.2010 No.05
Using a large sample of block share acquisitions in the U.S. during the period of 1990-2006, we examine the sources of value gains in private equity (PE) investment. We find that compared to non-PE acquirers, PE acquirers are more likely to have their representatives with finance experience on the target’s boards, particularly when the target performs poorly or when it has higher agency problems. PE acquirers are also more likely to designate their representatives with industry experience in the target’s industry into the target’s boards when the target has more complex operations (e.g., more segments or higher R&D intensity). The targets of the PE investors, particularly those whose boards have the representatives from PE investors, realize both higher abnormal announcement returns and better post-acquisition operating performance than do the targets of other acquirers. Target announcement returns and its post-acquisition operating performance are also higher when PEdesignated directors have expertise in the target industry, when they sit on the boards of poorly performing targets, or when they sit on the boards of targets with higher R&D intensity. These findings suggest that governance and operational engineering that PE acquirers apply to their targets constitutes important sources of value creation in PE minority equity investments and such value creation is particularly evident when the needs for target oversight and/or advice are greater.
Disjoint small cycles in graphs
Yunshu Gao,Guojun Li,Jin Yan 한국전산응용수학회 2009 Journal of applied mathematics & informatics Vol.27 No.3
We call a cycle C be a small cycle if the length of C equals to 3 or 4. In this paper, we obtain two sufficient conditions to ensure the existence of vertex-disjoint small cycles in graph and propose several problems. We call a cycle C be a small cycle if the length of C equals to 3 or 4. In this paper, we obtain two sufficient conditions to ensure the existence of vertex-disjoint small cycles in graph and propose several problems.
Xibo Hao,Guojun Jiang,Jin Tao,Guoliang Liu,Sheng Xie 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10
Die configuration is one of the most important factors that determine the polymer jet attenuation during meltblowing. To find the optimum slot angle, we investigated the effects of sharp die slot angles (60 °, 50 °, 40 °) on the polymerjet attenuation experimentally and numerically. A model which incorporated the air-polymer coupling effect was built basedon phase field method to investigate the die performance. In the experiment, sharp dies with different slot angles werefabricated and adopted for producing melt-blown nonwovens. The SEM and filter efficiency measurement, and numericalanalysis demonstrated that the 60 ° sharp die has the best performance in polymer jet attenuation.
DISJOINT SMALL CYCLES IN GRAPHS
Gao, Yunshu,Li, Guojun,Yan, Jin The Korean Society for Computational and Applied M 2009 Journal of applied mathematics & informatics Vol.27 No.3
We call a cycle C be a small cycle if the length of C equals to 3 or 4. In this paper, we obtain two sufficient conditions to ensure the existence of vertex-disjoint small cycles in graph and propose several problems.
Wang, Zhonghao,Hu, Xun,Wang, Lina,Jin, Bingjun,Zou, Guojun,Huang, Zhiwei,Liu, Qing,Hu, Guangzhi,Zhang, Kan,Park, Jong Hyeok Elsevier 2019 ELECTROCHIMICA ACTA Vol.299 No.-
<P><B>Abstract</B></P> <P>Herein, electrochemically sluggish polymeric carbon nitride (PCN) is successfully introduced into NiCo<SUB>2</SUB>O<SUB>4</SUB> to form hybrids of NiCo<SUB>2</SUB>O<SUB>4</SUB> and PCN, in which PCN nanosheets are regarded as a substrate to promote the nucleation and subsequent in-situ growth of NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets. The surface of as-prepared hybrids are rich in Ni and Co ions in low and high valence state, respectively. In addition, the hybrids exhibit more hydrophilic compared with that of pristine NiCo<SUB>2</SUB>O<SUB>4</SUB> due to its higher amounts of hydroxyl group. It has been found that the nitrogen species originated from PCN nanosheets tend to bond with the metal ions and electrolyte used, resulting in tuning the electronic structural states and coupling effects with NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets. Owing to these structural characteristics, the electrochemical performance as faradaic electrode materials and long-term stability of optimized hybrid is much superior to the bare NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NiCo<SUB>2</SUB>O<SUB>4</SUB>-PCN samples were prepared via a facile and scalable strategy. </LI> <LI> The NiCo<SUB>2</SUB>O<SUB>4</SUB>-PCN-40 exhibited much higher supercapacitor performance than that of pure NiCo<SUB>2</SUB>O<SUB>4</SUB>. </LI> <LI> The PCN nanosheets can promote the nucleation and subsequent in-situ growth of NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets in oriented way. </LI> <LI> The presence of PCN can tune the electronic structural states and coupling effects with NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The vertically growth of NiCo<SUB>2</SUB>O<SUB>4</SUB> on PCN nanosheets substrate with 3D open frameworks synthesized here is beneficial for facilitating electrolyte ions transport and electron trapping, thus boosting the supercapacitor performance of NiCo<SUB>2</SUB>O<SUB>4</SUB>.</P> <P>[DISPLAY OMISSION]</P>