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Yoontae Kim,Chankyun Lee,Rhee, J-K K.,Sangyoum Lee IEEE 2012 Journal of Lightwave Technology Vol.30 No.13
<P>Energy consumption in a network is becoming the physical limit against the everlasting increase of network traffic in the near future. Current network equipment consumes energy inefficiently due to poor energy-load proportionality of network equipment which causes a vast amount of energy consumption even in an idle state. We investigate and model the energy consumption of packet optical transport networks. Employing integer linear programming, we model and optimize the energy consumption of IP/WDM (IP/WDM) networks with traffic-grooming cross layer designs. Our study shows that energy savings in IP/WDM networks with traffic grooming is not effective unless IP layer equipment is energy proportional. In addition, different network planning schemes are required with respect to energy proportionality of network equipment.</P>
The role of PACT in the RNA silencing pathway
Lee, Yoontae,Hur, Inha,Park, Seong-Yeon,Kim, Young-Kook,Suh, Mi Ra,Kim, V Narry Wiley (John WileySons) 2006 The EMBO journal Vol.25 No.3
<P>Small RNA-mediated gene silencing (RNA silencing) has emerged as a major regulatory pathway in eukaryotes. Identification of the key factors involved in this pathway has been a subject of rigorous investigation in recent years. In humans, small RNAs are generated by Dicer and assembled into the effector complex known as RNA-induced silencing complex (RISC) by multiple factors including hAgo2, the mRNA-targeting endonuclease, and TRBP (HIV-1 TAR RNA-binding protein), a dsRNA-binding protein that interacts with both Dicer and hAgo2. Here we describe an additional dsRNA-binding protein known as PACT, which is significant in RNA silencing. PACT is associated with an approximately 500 kDa complex that contains Dicer, hAgo2, and TRBP. The interaction with Dicer involves the third dsRNA-binding domain (dsRBD) of PACT and the N-terminal region of Dicer containing the helicase motif. Like TRBP, PACT is not required for the pre-microRNA (miRNA) cleavage reaction step. However, the depletion of PACT strongly affects the accumulation of mature miRNA in vivo and moderately reduces the efficiency of small interfering RNA-induced RNA interference. Our study indicates that, unlike other RNase III type proteins, human Dicer may employ two different dsRBD-containing proteins that facilitate RISC assembly.</P>
전력수요자원시장(지원금입찰제) 운영사례 고찰을 통한 개선방향
손윤태(Yoontae Sohn),심대섭(Daesup Shim),김두중(Doojung Kim),최정곤(Jeunggon Choi),이호승(Hoseung Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
전력거래소는 시장원리를 적용한 지원금 입찰제에 의한 수요시장을 설계하고 시장운영에 필요한 시스템을 구축하여 수요반응을 측정하기 위한 수요자원시장을 2008년도에 시범적으로 운영하였다. 본 논문에서는 작년도 수요자원시장 운영결과를 분석하여 개선점을 도출하고 수요반응에 입각한 전력수요 자원을 효율적으로 활용하기 위한 방안에 대하여 소개한다.
MicroRNA genes are transcribed by RNA polymerase II
Lee, Yoontae,Kim, Minju,Han, Jinju,Yeom, Kyu-Hyun,Lee, Sanghyuk,Baek, Sung Hee,Kim, V Narry Wiley (John WileySons) 2004 The EMBO journal Vol.23 No.20
<P>MicroRNAs (miRNAs) constitute a large family of noncoding RNAs that function as guide molecules in diverse gene silencing pathways. Current efforts are focused on the regulatory function of miRNAs, while little is known about how these unusual genes themselves are regulated. Here we present the first direct evidence that miRNA genes are transcribed by RNA polymerase II (pol II). The primary miRNA transcripts (pri-miRNAs) contain cap structures as well as poly(A) tails, which are the unique properties of class II gene transcripts. The treatment of human cells with alpha-amanitin decreased the level of pri-miRNAs at a concentration that selectively inhibits pol II activity. Furthermore, chromatin immunoprecipitation analyses show that pol II is physically associated with a miRNA promoter. We also describe, for the first time, the detailed structure of a miRNA gene by determining the promoter and the terminator of mir-23a approximately 27a approximately 24-2. These data indicate that pol II is the main, if not the only, RNA polymerase for miRNA gene transcription. Our study offers a basis for understanding the structure and regulation of miRNA genes.</P>