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RISS 인기검색어
- 검색키워드
- 저자 : Tolbert, Laren M. (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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Analysis and Design of Energy and Slew Aware Subthreshold Clock Systems
Tolbert, J. R.,Xin Zhao,Sung Kyu Lim,Mukhopadhyay, S. IEEE 2011 IEEE transactions on computer-aided design of inte Vol.30 No.9
<P>In this paper, we analyze the effect of clock slew in subthreshold circuits. Specifically, we address the issue that variations in clock slew at the register control can cause serious timing violations. We show that clock slew variations can cause frequency targets to deviate by as much as 28% from the design goals. Based on these observations, we recognize the importance of clock slew control in subthreshold circuits. We propose a systematic approach to design the clock tree for subthreshold circuits to reduce the clock slew variations while minimizing the energy dissipation in the tree. The combined approach, including the wire sizing and dynamic nodal capacitance control, can achieve better slew control (and better timing control) at lower energy in subthreshold circuits.</P>
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Choi J. D.,Engel B. A.,Tolbert V. R.,Bock B. R.,Thornton F. C.,Pettry D.,Schoenholts S. Korean National Committee on Irrigation and Draina 1999 한국관개배수논문집 Vol.6 No.1
화석연료의 고갈에 대비한 대체에너지 개발의 일환으로 미국의 에너지성과 TVA는 속성수인 Cottonwood를 재배하여 에너지화 하는 연구를 하고 있다. 미시시피주 Stoneville에 0.365ha 크기의 시험포 6개를 설치하고 Cottonwood와 Cotton을 재배하며 환경영향을 평가하기 위하여 유출량, 부유물질(TSS), 질산성 질소($NO_3-N$, 총인(T-P) 등의 수질인자를 모니터링하고 있다. 본 연구는 EPIC 모델이
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Reactive Power Operation Analysis of a Single-Phase EV/PHEV Bidirectional Battery Charger
Mithat C. Kisacikoglu,Burak Ozpineci,Leon M. Tolbert 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
More battery powered electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs) will be introduced to the market in 2011 and beyond. PHEVs/EVs potentially have the capability to fulfill the energy storage needs of the electric grid by supplying ancillary services such as reactive power compensation, voltage regulation, and peak shaving since they carry an on-board battery charger. However, to allow bidirectional power transfer, the PHEV battery charger should be designed to manage such reactive power capability. This study shows how bidirectional four-quadrant operation affects the design stage of a conventional unidirectional charger and the operation of the battery pack. Mainly, the subjects that are discussed are the following: required topology updates, dc link capacitor (voltage and current), ac inductor (current), rectifier (power loss), and battery pack (voltage and current).
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Choi, J. D.,Engel, B. A.,Tolbert, V. R.,Bock, B. R.,Thornton, F. C.,Pettry, D.,Schoenholts, S. 江原大學校 附設 環境硏究所 1999 環境硏究 Vol.16 No.-
화석연료의 고갈에 대비한 대체에너지 개발의 일환으로 미국의 에너지성과 TVA는 속성수인 Cottonwood를 재배하여 에너지화 하는 연구를 하고 있다. 미시시피주 Stoneville에 0.365㏊ 크기의 시험포 6개를 설치하고 Cottonwood와 Cotton을 재배하며 환경영향을 평가하기 위하여 유출량, 부유물질(TSS), 질산성 질소(NO₃-N), 총인(T-P) 등의 수질인자를 모니터링하고 있다. 본 연구는 EPIC 모델이 이들 수질인자들을 예측할 수 있는지를 평가하고 Cottonwood의 재배가 유출수의 수질에 미치는 장기적인 영향을 평가하기 위하여 수행되었다. EPIC 모델의 유출량 예측치는 실측치와 비교적 잘 일치하였으며, Cottonwood 시험포의 유출량은 장기적으로 Cotton 시험포의 유출량에 비하여 37% 작게 유출되는 것으로 나타났다. TSS의 예측은 재배 초기에는 잘 맞지 않았으나 Cottonwood가 성장하면서 실측치와 예측치는 비교적 잘 일치하는 것으로 나타났다. 질산성 질소와 총인의 예측치는 실측치와 잘 일치하지 않아 EPIC을 이용한 이들의 장기적인 영향의 예측에는 세심한 주의가 필요한 것으로 나타났다. EPIC 모델은 Cottonwood 시험포의 유출량과 TSS를 비교적 잘 예측하여 Cottonwood 재배가 장기적인 강우 및 TSS 유출에 미치는 영향을 평가할 수 있는 도구로 사용될 수 있다고 판단되었다.
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Lee, Jun-Seok,Baldridge, Anthony,Feng, Suihan,SiQiang, Yang,Kim, Yun Kyung,Tolbert, Laren M.,Chang, Young-Tae American Chemical Society 2011 ACS combinatorial science Vol.13 No.1
<P>Using a fluorescence response profile, a systematic examination was performed for synthetic chromophores of the green fluorescent protein (GFP) to discover new small molecule sensors. A group of 41 benzylideneimidazolinone compounds (<B>BDI</B>) was prepared and screened toward 94 biologically relevant analytes to generate fluorescence response profiles. From the response pattern, compounds containing aminobenzyl and heteroaromatic cyclic substructures revealed a pH dependent emission decrease effect, and unlike other fluorescence scaffolds, most <B>BDIs</B> showed fluorescence quenching when mixed with proteins. On the basis of the primary response profile, we obtained three selective fluorescence turn-on sensors for pH, human serum albumin (HSA), and total ribonucleic acid (RNA). Following analysis, a fluorescence response profile testing four nucleic acids revealed the alkyloxy (Ph−OR) functional group in the <I>para</I> position of benzyl analogues contributes to RNA selectivity. Among the primary hit compounds, <B>BDI 2</B> showed outstanding selectivity toward total RNA with 5-fold emission enhancement. Finally, <B>BDI 24</B> showed selective fluorescence increase to HSA (<I>K</I><SUB>d</SUB> = 3.57 μM) with a blue-shifted emission max wavelength (Δλ<SUB>em</SUB> = 15 nm). These examples of fluorescence sensor discovery by large-scale fluorescence response profiling demonstrate the general applicability of this approach and the usefulness of the response profiles.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/acsccc/2011/acsccc.2011.13.issue-1/co100012k/production/images/medium/co-2010-00012k_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/co100012k'>ACS Electronic Supporting Info</A></P>
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High Temperature Packaging of 50 ㎾ Three-Phase SiC Power Module
Fan Xu,Dong Jiang,Jing Wang,Fred Wang,Leon M. Tolbert,Timothy Junghee Han,Jim Nagashima,Sung Joon Kim 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Research on silicon carbide (SiC) power electronics has shown their advantages in high temperature and high efficiency applications. This paper presents a SiC JFET based, 200 ℃, 50 ㎾ three-phase inverter module and evaluates its electrical performance. With 1200 V, 100 A rating of the module, each switching element is composed of four paralleled SiC JFETs (1200 V/25 A each) and two anti-parallel SiC Shottky Barrier Diodes (SBDs). The substrate layout inside the module is designed to reduce package parasitics. Then, experimental static characteristics of the module are obtained over a wide range of temperature, and low on-state resistance is shown up to 200 ℃. A gate driver, with different turn-on, turn-off gate resistances and RCD network, is designed to optimize the switching performances. The module is verified to have low power loss, fast switching characteristics at 650 V dc bus voltage, 60 A drain current, in both simulation and experiments. Finally, switching time and losses, obtained from simulation and experiment, are compared.
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