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A Technology Diffusion Model Based on Technology Policy
진메이웨(Jin, Mei-Yue) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.6
기술정책은 신기술 확산에 영향을 주는 중요한 요인 중의 하나이다. 본 연구의 목적은 기존의 전염병 확산 모형을 기초로 정책변수를 추가한 신기술 확산모형을 구축하고, 미국에서의 이산화탄소 배출 감소에 응용되는 고체조 명(Solid-State Lighting) 기술을 사례로 실증연구를 진행하는 것이다. 실험결과, 정책변수는 정(+)의 영향을 미치는 것 으로 나타났으며, 기술정책은 신기술의 확산에 추진 작용을 하는 것으로 나타났다. 이는 정책적 역할에 대한 정량적 이해를 도모하는데 있어서 정량적 판단을 위한 자료를 제공하고, 정책변수와 신기술 확산의 정량적 관계를 파악하는 데 도움이 될 것이다. Technology policy has a substantial impact on the diffusion of a new technology. This paper uses technology policy as a variable in the general epidemic model to quantify the effects of the policy on technology diffusion. The results obtained in this study, using data on solid-state technology diffusion in the U.S. indicate that technology policy plays a positive role in technology diffusion and provide a firm basis for understanding the relationship between technology policy and technology diffusion through the use of quantitative data.
Nickel‑based N/S‑dual doped graphene/carbon nanotubes electrocatalyst for oxygen evolution
Jin‑Chi Jiang,Jiamin Liu,Yingai Piao,Mei‑Shan Zhang,Long‑Yue Meng 한국탄소학회 2023 Carbon Letters Vol.33 No.1
Hydrogen energy is a promising source of renewable and clean energy for various industries, such as chemical, automobile, and energy industries. Electrolysis of water is one of the basic methods for the production of hydrogen energy. However, the high overpotential of the oxygen evolution reaction (OER) in water electrolysis has hindered the effective production of hydrogen using this method. Thus, the development of high-efficiency non-precious metal-based electrocatalysts for OER is extremely significant. In this study, we adopted a one-step hydrothermal method to fabricate Ni-based catalysts with N/Sdual doped graphene oxide/carbon nanotube (GO/CNT) supports using thiourea ( CH4N2S) and urea as the S source and the N source. It was observed that the amount of thiourea utilized in the synthesis of the catalyst affected the morphology, composition, and the electrochemical properties of the catalyst. For a GO/CNT-to-thiourea mass ratio of 1:10, the catalyst exhibited the highest activity, where the OER overpotential was 320 mV at a current density of 10 mA/cm2. This was attributed to the high specific surface area, high conductivity, and fast electron transport channels of the N/S-dual doped GO/ CNT composite. Furthermore, sulfurization of the Ni particles to form nickel sulfide played a significant role in enhancing the catalytic performance.
Jin, Yong‐,Mei,Jung, Jinwook,Jeon, Hyesung,Won, So Youn,Feng, Yue,Kang, Jae‐,Sook,Lee, Sang Yeol,Cheong, Jong‐,Joo,Koiwa, Hisashi,Kim, Minkyun Blackwell Publishing Ltd 2011 The New phytologist Vol.190 No.1
<P><B>Summary</B></P><P><P>Arabidopsis RNA polymerase II (RNAPII) C‐terminal domain (CTD) phosphatases regulate stress‐responsive gene expression and plant development via the dephosphorylation of serine (Ser) residues of the CTD. Some of these phosphatases (CTD phosphatase‐like 1 (CPL1) to CPL3) negatively regulate ABA and stress responses. Here, we isolated <I>AtCPL5</I>, a cDNA encoding a protein containing two CTD phosphatase domains (CPDs).</P><P>To characterize AtCPL5, we analyzed the gene expression patterns and subcellular protein localization, investigated various phenotypes of <I>AtCPL5</I>‐overexpressors and knockout mutants involved in ABA and drought responses, performed microarray and RNA hybridization analyses using <I>AtCPL5</I>‐overexpressors, and assessed the CTD phosphatase activities of the purified AtCPL5 and each CPD of the protein.</P><P>Transcripts of the nucleus‐localized AtCPL5 were induced by ABA and drought. <I>AtCPL5</I>‐overexpressors exhibited ABA‐hypersensitive phenotypes (increased inhibition of seed germination, seedling growth, and stomatal aperture), lower transpiration rates upon dehydration, and enhanced drought tolerance, while the knockout mutants showed weak ABA hyposensitivity. <I>AtCPL5</I> overexpression changed the expression of numerous genes, including those involved in ABA‐mediated responses. In contrast to Ser‐5‐specific phosphatase activity of the negative stress response regulators, purified AtCPL5 and each CPD of the protein specifically dephosphorylated Ser‐2 in RNAPII CTD.</P><P>We conclude that AtCPL5 is a unique CPL family protein that positively regulates ABA‐mediated development and drought responses in Arabidopsis.</P></P>