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김기훈(Kihoon Kim),김경호(Kyungho Kim),김형탁(Hyoungtak Kim),이주성(Jusung Lee),신민철(Mincheol Shin),김창원(Changwon Kim),윤진한(Jinhan Yun),이정규(Jungkyu Lee),홍원석(Wonseok Hong) 한국환경에너지공학회 2023 한국열환경공학회 학술대회지 Vol.2023 No.1
선택 적 비촉매 환원법 (Selective Non-Catalytic Reduction)은 소각로의 연소실 내부로 환원제를 주입하여 연소과정에서 발생하는 질소산화물을 제거하는 기술이다. 대부분의 소각시설에서는 환원제로 요소수를 사용하고 있으며, 이류체 노즐을 통하여 분사된 요소수는 연소가스 중 질소산화물을 질소와 수증기로 환원시킨다. 이러한 선택적 비촉매 환원법의 경우에 초기 투자비 및 유지비가 적다는 장점이 있으나 요소수가 액상으로 주입되기 때문에 질소산화물과의 반웅 효율이 낮아 일부 미반응된 요소수가 대기 중으로 배출되는 암모니아 슬립 발생에 대한 문제점이 있다. 또한 계속해서 강화되는 대기오염물질 배출허용기준과 미세먼지 관리 종합대책의 후속 조치로 질소산화물 배출 부과금제가 시행됨에 따라 기존의 소각시설들은 질소산화물의 관리를 강화할 수 있는 현실적인 대책이 필요한 실정이다. 따라서 본 연구에서는 요소수를 기화시킨 후 소각로 내부로 주입하여 암모니아 슬립 발생은 줄이면서 질소산화물의 저감 효율은 극대화하고자 하였으며, 추가적인 가열설비의 구축 없이 소각로에서 발생되는 폐열을 활용하여 이를 구현하고자 하였다. 요소수의 기화 및 주입을 위하여 소각로 잉여 열원의 현황을 파악하고 운영조건을 사전에 검토하였으며, 온도와 압력에 따른 요소수의 기화 특성을 실험적으로 확인하여 설비 제작을 위한 설계 인자를 도출하였다.
Kihoon Kim,Myeongjin Park,Ohmin Kwon 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
This paper considers a delay-dependent H∞ problem for linear systems with a constant time-delay and interval randomly varying disturbances. It is assumed that the variance probability of disturbances satisfies the Bernoulli distribution. By constructing a suitable Lyapunov-Krasovskii functional, an H∞ control criterion for the system is proposed in terms of linear matrix inequalities (LMIs) which can be easily solvable by effective optimization algorithms. One numerical example is included to demonstrate the effectiveness of the presented criterion with designed controller.
Synaptic removal of diacylglycerol by DGKzeta and PSD-95 regulates dendritic spine maintenance.
Kim, Karam,Yang, Jinhee,Zhong, Xiao-Ping,Kim, Myoung-Hwan,Kim, Yun Sook,Lee, Hyun Woo,Han, Seungnam,Choi, Jeonghoon,Han, Kihoon,Seo, Jinsoo,Prescott, Stephen M,Topham, Matthew K,Bae, Yong Chul,Koretzk Published for the European Molecular Biology Organ 2009 The EMBO journal Vol.28 No.8
<P>Diacylglycerol (DAG) is an important lipid signalling molecule that exerts an effect on various effector proteins including protein kinase C. A main mechanism for DAG removal is to convert it to phosphatidic acid (PA) by DAG kinases (DGKs). However, it is not well understood how DGKs are targeted to specific subcellular sites and tightly regulates DAG levels. The neuronal synapse is a prominent site of DAG production. Here, we show that DGKzeta is targeted to excitatory synapses through its direct interaction with the postsynaptic PDZ scaffold PSD-95. Overexpression of DGKzeta in cultured neurons increases the number of dendritic spines, which receive the majority of excitatory synaptic inputs, in a manner requiring its catalytic activity and PSD-95 binding. Conversely, DGKzeta knockdown reduces spine density. Mice deficient in DGKzeta expression show reduced spine density and excitatory synaptic transmission. Time-lapse imaging indicates that DGKzeta is required for spine maintenance but not formation. We propose that PSD-95 targets DGKzeta to synaptic DAG-producing receptors to tightly couple synaptic DAG production to its conversion to PA for the maintenance of spine density.</P>
Kim, Byung-Hyun,Kim, Gyubong,Park, Kihoon,Shin, Mincheol,Chung, Yong-Chae,Lee, Kwang-Ryeol American Institute of Physics 2013 JOURNAL OF APPLIED PHYSICS - Vol.113 No.7
<P>A multi-scale approach connecting the atomistic process simulations to the device-level simulations has been applied to the Si(100)/SiO2 interface system. The oxidation of Si(100) surface was simulated by the atomic level molecular dynamics, the electronic structure of the resultant Si/suboxide/SiO2 interface was then obtained by the first-principles calculations, and finally, the leakage currents through the SiO2 gate dielectric were evaluated, with the obtained interface model, by the non-equilibrium Green's function method. We have found that the suboxide layers play a significant role for the electronic properties of the interface system and hence the leakage currents through the gate dielectric. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4791706]</P>
Online Platform Competition with Asymmetric Revenue Structures
( Kihoon Kim ) 한국생산성학회 2018 生産性論集 Vol.32 No.1
A new online platform may only charge advertisers to compete with a leading incumbent one that collect fees from its users. When these two platforms compete with asymmetric revenue structures, the result of the competition can be different depending on several factors such as the degrees of users singlehoming, the potential market size, and the price-sensitivity of users charged by the incumbent. It is shown that unless all the users singlehome, the latecomer can overtake the incumbent when the potential market size is large or the price-sensitivity of the user group charged by the incumbent is high. This result is also consistent with the anecdotal evidences in China and the US to a degree. This study first shows that a potential market size can change the winner of the competition between an incumbent platform and a new one with asymmetric revenue structures. When one side tends to join the two platforms at a time, the latter can overtake the former if the market is not mature so that there is a room for its further growth. When Taobao started to compete with eBay China in 2003, the market itself was at an intial stage, so that Taobao could win over eBay China by not charging its sellers. On the other hand, Webstore, a free advertising-based online auction platform in the US, has been far behind eBay since its launch in 2008 was too late to change the winner of the competition. The users’ price-sensitivity also impacts the competition. Unless both buyers and sellers singlehome, if sellers are highly price-sensitive, the latecomer can win over the incumbent even when the potential market size is small. As Barnett et al. (2010) indicate, Chinese online auction sellers could have been unfamiliar with and averse to the idea of paying transaction fees. Unfortunately, eBay China adopted the policy of charging its sellers when it entered the market acquiring the leading local platform EachNet in 2003. Taobao, a small player at that time, did not impose any transaction fees on sellers and so could eventually attract more sellers than eBay China in a few years.