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HOW TO PREPARE FOR RETIREMENT? OPTIMAL SAVING, LABOR SUPPLY, AND INVESTMENT STRATEGY
BON CHEON KOO,JISOO KOO,HANA SONG,HYO-BIN YOON,MIN-SEOK KIM 한국산업응용수학회 2014 Journal of the Korean Society for Industrial and A Vol.18 No.4
In this paper we study consumption-labor supply decision of an agent who prepares for retirement at a known time in the future. The agent is assumed to have a preference which is represented by the von Neumann-Morgenstern utility function in which the felicity function has constant relative risk aversion over the composite of consumption and leisure. The composite is obtained by the Cobb-Douglas function. A general problem has been studied by Bodie et al. (2004). We contribute to the literature by deriving the Slutsky equations and conducting comparative statics. In particular, we show that wealth effect can exhibit an interesting property depending upon the time until retirement, as the interest rate increases.
How To Prepare For Retirement? Optimal Saving, Labor Supply, and Investment Strategy
( Bon Chun Koo ),( Jisoo Koo ),( Hana Song ),( Hyo Bin Yoon ),( Min Seok Kim ) 한국금융공학회 2012 한국금융공학회 학술발표회 Vol.2012 No.2
In this paper we study consumption-labor supply decision of an agent who prepares for retirement at a known time in the future. The agent is assumed to have a preference which is represented by a von Neumann-Morgenstern utility function in which the felicity function has constant relative risk aversion over the composite of consumption and leisure. The composite is obtained by a Cobb-Douglas function. A general problem has been studied by Bodie, Detemple, Ortuba, and Walter (2004). We contribute to the literature by deriving Slutsky equations and conduct comparative statics. In particular, we show that the wealth effect can exhibit interesting property depending upon the time until retirement, as the interest rate increases.
How To Prepare For Retirement? Optimal Saving, Labor Supply, and Investment Strategy
Bon-chun Koo,Min-seok Kim,Jisoo Koo,Hana Song,Hyo-bin Yoon,Hyeng Keun Koo 한국재무학회 2012 한국재무학회 학술대회 Vol.2012 No.05
In this paper we study consumption-labor supply decision of an agent who prepares for retirement at a known time in the future. The agent is assumed to have a preference which is represented by a von Neumann-Morgenstern utility function in which the felicity function has constant relative risk aversion over the composite of consumption and leisure. The composite is obtained by a Cobb-Douglas function. A general problem has been studied by Bodie, Detemple, Otruba, and Walter (2004). We contribute to the literature by deriving Slutsky equations and conduct comparative statics. In particular, we show that the wealth eect can exhibit interesting property depending upon the time until retirement, as the interest rate increases.
양면수광형(Bifacial) 태양광 모듈을 위한 고투과도 PV(Photovoltaic) 백쉬트의 연구
박지수(Jisoo Park),노은섭(Eun-Seob Noh),윤종국(Jong-Kuk Yoon),박종세(Jong-Se Park),장현태(Hyun-Tae Jang),최재호(Jaeho Choi),구경완(Kyung-Wan Koo) 대한전기학회 2019 전기학회논문지 Vol.68 No.2
PV module protective film plays an important role in protecting the solar cell from external environment by anti-hydrolysis polyester, UV resistance and mechanical properties. The backsheet was manufactured by using Roll-to-Roll dry laminating process. Recently, various research and evaluations have been conducted in order to increase the generation power output of solar panel. In this study, we have experimented the basic properties of the coating type outer layer and inner layer materials for high tranparency for UV and visible light spectrum ranges in order for the bifacial solar panel. Long-term environment weatherability tests were conducted for confirming 25 year reliability in the field such as PCT, UV, and power efficiency degradations in case of application of bifacial solar module. As the evaluation result, high transparent coating type protection film can be available to bifacial solar panel by using UV-cut PVDF coating layer and high reliability primer layer.
Giant nonlinear response of terahertz nanoresonators on VO_2 thin film
Kyoung, Jisoo,Seo, Minah,Park, Hyeongryeol,Koo, Sukmo,Kim, Hyun-sun,Park, Youngmi,Kim, Bong-Jun,Ahn, Kwangjun,Park, Namkyoo,Kim, Hyun-Tak,Kim, Dai-Sik The Optical Society 2010 Optics express Vol.18 No.16
<P>We report on an order of magnitude enhanced nonlinear response of vanadium dioxide thin film patterned with nanoresonators - nano slot antennas fabricated on the gold film. Transmission of terahertz radiation, little affected by an optical pumping for the case of bulk thin film, can now be completely switched-off: DeltaT/T approximately -0.9999 by the same optical pumping power. This unprecedentedly large optical pump-terahertz probe nonlinearity originates from the insulator-to-metal phase transition drastically reducing the antenna cross sections of the nanoresonators. Our scheme enables nanoscale-thin film technology to be used for all-optical switching of long wavelength light.</P>
Active Terahertz Nanoantennas Based on VO<sub>2</sub> Phase Transition
Seo, Minah,Kyoung, Jisoo,Park, Hyeongryeol,Koo, Sukmo,Kim, Hyun-sun,Bernien, Hannes,Kim, Bong Jun,Choe, Jong Ho,Ahn, Yeong Hwan,Kim, Hyun-Tak,Park, Namkyoo,Park, Q-Han,Ahn, Kwangjun,Kim, Dai-sik American Chemical Society 2010 Nano letters Vol.10 No.6
<P>Unusual performances of metamaterials such as negative index of refraction, memory effect, and cloaking originate from the resonance features of the <I>metallic composite atom</I><SUP>1−6</SUP>. Indeed, control of metamaterial properties by changing dielectric environments of thin films below the metallic resonators has been demonstrated<SUP>7−11</SUP>. However, the dynamic control ranges are still limited to less than a factor of 10,<SUP>7−11</SUP> with the applicable bandwidth defined by the sharp resonance features. Here, we present ultra-broad-band metamaterial thin film with colossal dynamic control range, fulfilling present day research demands. Hybridized with thin VO<SUB>2</SUB> (vanadium dioxide)(12-18) films, nanoresonator supercell arrays designed for one decade of spectral width in terahertz frequency region show an unprecedented extinction ratio of over 10000 when the underlying thin film experiences a phase transition. Our nanoresonator approach realizes the full potential of the thin film technology for long wavelength applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2010/nalefd.2010.10.issue-6/nl1002153/production/images/medium/nl-2010-002153_0002.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl1002153'>ACS Electronic Supporting Info</A></P>
Kim, Ji-Yon,Woo, So-Youn,Hong, Young Bin,Choi, Heesun,Kim, Jisoo,Choi, Hyunjung,Mook-Jung, Inhee,Ha, Nina,Kyung, Jangbeen,Koo, Soo Kyung,Jung, Sung-Chul,Choi, Byung-Ok Hindawi Publishing Corporation 2016 Stem cells international Vol.2016 No.-
<P>The Charcot-Marie-Tooth disease 2F (CMT2F) and distal hereditary motor neuropathy 2B (dHMN2B) are caused by autosomal dominantly inherited mutations of the heat shock 27 kDa protein 1 (<I>HSPB1</I>) gene and there are no specific therapies available yet. Here, we assessed the potential therapeutic effect of HDAC6 inhibitors on peripheral neuropathy with<I> HSPB1</I> mutation using in vitro model of motor neurons derived from induced pluripotent stem cells (iPSCs) of CMT2F and dHMN2B patients. The absolute velocity of mitochondrial movements and the percentage of moving mitochondria in axons were lower both in CMT2F-motor neurons and in dHMN2B-motor neurons than those in controls, and the severity of the defective mitochondrial movement was different between the two disease models. CMT2F-motor neurons and dHMN2B-motor neurons also showed reduced <I>α</I>-tubulin acetylation compared with controls. The newly developed HDAC6 inhibitors, CHEMICAL X4 and CHEMICAL X9, increased acetylation of <I>α</I>-tubulin and reversed axonal movement defects of mitochondria in CMT2F-motor neurons and dHMN2B-motor neurons. Our results suggest that the neurons derived from patient-specific iPSCs can be used in drug screening including HDAC6 inhibitors targeting peripheral neuropathy.</P>