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Lee, Yebin,Yang, Ilseung,Lee, Jung Eun,Hwang, Sunjin,Lee, Jong Woo,Um, Seung-Soo,Nguyen, Thanh Luan,Yoo, Pil J.,Woo, Han Young,Park, Juhyun,Kim, Seong Keun American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.7
<P>We show that Förster resonance energy transfer (FRET) between a conjugated oligoelectrolyte based on distyrylstilbene (DSSN+) and Nile red can enhance photocurrent generation when the photoagents are assembled vertically on gold electrodes. DSSN+ and Nile red intercalated into phospholipid membranes of unilamellar vesicles were found to form a useful FRET system because of the solvatochromic properties of DSSN+, and the accompanying photophysical properties were suitable for FRET with Nile red. As a result, a FRET efficiency of 93–94% was achieved, as shown by steady-state and time-resolved spectra in vesicle solutions. When Nile red was tethered in a self-assembled monolayer of 11-mercaptoundecanoic acid (MUA) on gold electrodes and phospholipid-assembled DSSN+ was sequentially organized on the MUA layer, the anodic photocurrent increased notably, reaching about 815 nA/cm<SUP>2</SUP> by virtue of FRET between the vertically aligned dyes.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-7/jp3117193/production/images/medium/jp-2012-117193_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp3117193'>ACS Electronic Supporting Info</A></P>
Yebin D. Ahn,Dahyun Yi,Haejung Joung,Eun Hyun Seo,Young Hwa Lee,Min Soo Byun,이준호,So Yeon Jeon,Jun-Young Lee,Bo Kyung Sohn,Dong Young Lee,KBASE Research Group 대한신경정신의학회 2019 PSYCHIATRY INVESTIGATION Vol.16 No.11
Objective The purpose of this study is to identify the demographic variables that are affecting performances on the Logical Memory (LM) subtest included in the Korean version of the Wechsler Memory Scale (WMS)-IV and to provide normative data on the LM subtest for the middle-age and elderly Korean people. Methods The participants were 435 non-demented adults aging from 50 to 90 and with the educational level ranging from 0 to 21 years. Results Age and education were found to be significantly associated with performance on the LM subtest, while gender effect was not statistically significant. Therefore, we stratified the norm blocks by age and education. Age was divided into three groups: 50–59, 60–74, and 75–90 years. Education was stratified into three groups: 0–8 years, 9–12 years, and 13 years or more. Conclusion The normative data provided in the current study are expected to be useful in clinical and research settings to detect or define subtle changes in episodic memory in Korean adults and elderly, and can also be used for cross-cultural comparison of verbal episodic memory performance among elderly populations using different languages.
RAMS: DRAM Rank-Aware Memory Scheduling for Energy Saving
Yebin Lee,Soontae Kim IEEE 2016 IEEE Transactions on Computers Vol. No.
<P>DRAMs are one of the main players of the computer system energy consumption. Thus, reducing DRAM energy consumption has a big potential to save the entire system energy consumption. Because the standby power consumption of DRAM is significant, modern DRAMs provide low-power modes for reducing idle energy consumption. However, the use of low-power modes can degrade the performance because state transitions to/from low-power states involve a time penalty. To effectively utilize low-power modes, we propose DRAM rank-aware memory scheduling schemes. One scheme utilizes a prioritized cache block replacement method considering the power states of DRAM ranks to select victim blocks for the late level cache. Through this scheme, DRAM traffic and the number of state transitions of DRAM ranks can be reduced. The other scheme utilizes the memory controller by controlling write traffic to DRAM with the awareness of the DRAM rank states. DRAM rank idle times and state transitions can be reduced by this scheme. Our proposed schemes are shown to reduce DRAM energy consumption by 15.2 percent on average.</P>
CLAP: Clustered Look-Ahead Prefetching for Energy-Efficient DRAM System
Yebin Lee,Soontae Kim Institute of Electrical and Electronics Engineers 2016 IEEE transactions on very large scale integration Vol.24 No.5
<P>DRAM is one of the main sources of energy consumption in computer systems. Thus, reducing the energy consumption of DRAM can prolong the lifetime of battery-operated embedded/mobile systems. To this end, we propose a DRAM energy-aware prefetching scheme to increase row buffer hits and idle periods of DRAM by clustering its accesses. Although prefetching schemes have traditionally been used to improve the system performance, utilizing them for the energy conservation of DRAM has yet to be investigated. For such energy conservation, our scheme accurately predicts and clusters potential future DRAM accesses. Clustered DRAM accesses exploit a popular first-ready first-come first-serve memory request scheduling and a power-down mode of DRAM more effectively; the probability of row buffer hits and idle periods is significantly increased by our clustering scheme. As a result, large amounts of row activation and idle energy consumption, which are major energy consumption factors in modern DRAM, can be saved. Our prefetching-based memory traffic-clustering scheme was shown to reduce the power and energy consumption of DRAM and improve its performance by an average of 0.2%, 28.9%, and 15.7%, respectively, for memory-intensive programs.</P>
Performance Analysis of GNSS Residual Error Bounding for QZSS CLAS
Yebin Lee,Cheolsoon Lim,Yunho Cha,Byungwoon Park,Sul-Gee Park,Sanghyun Park 사단법인 항법시스템학회 2023 Journal of Positioning, Navigation, and Timing Vol.12 No.3
The State Space Representation (SSR) method provides individual corrections for each Global Navigation Satellite System (GNSS) error components. This method can lead to less bandwidth for transmission and allows selective use of each correction. Precise Point Positioning (PPP) - Real-Time Kinematic (RTK) is one of the carrier-based precise positioning techniques using SSR correction. This technique enables high-precision positioning with a fast convergence time by providing atmospheric correction as well as satellite orbit and clock correction. Currently, the positioning service that supports PPPRTK technology is the Quazi-Zenith Satellite System Centimeter Level Augmentation System (QZSS CLAS) in Japan. A system that provides correction for each GNSS error component, such as QZSS CLAS, requires monitoring of each error component to provide reliable correction and integrity information to the user. In this study, we conducted an analysis of the performance of residual error bounding for each error component. To assess this performance, we utilized the correction and quality indicators provided by QZSS CLAS. Performance analyses included the range domain, dispersive part, non-dispersive part, and satellite orbit/clock part. The residual root mean square (RMS) of CLAS correction for the range domain approximated 0.0369 m, and the residual RMS for both dispersive and non-dispersive components is around 0.0363 m. It has also been confirmed that the residual errors are properly bounded by the integrity parameters. However, the satellite orbit and clock part have a larger residual of about 0.6508 m, and it was confirmed that this residual was not bounded by the integrity parameters. Users who rely solely on satellite orbit and clock correction, particularly maritime users, thus should exercise caution when utilizing QZSS CLAS.
( Yebin Kwon ),( Tae-ho Ham ),( Jeehye Kim ),( Gileung Lee ),( Yoonjung Lee ),( Joohyun Lee ) 한국육종학회 2021 Plant Breeding and Biotechnology Vol.9 No.2
At the reproductive development stage of rice (Oryza sativa L.), temperature stress can decrease spikelet fertility, ultimately resulting in a yield loss. In this study, a total of 98 rice varieties were used in genome-wide association study (GWAS) to understand spikelet fertility under a high temperature (SFHT). GWAS results revealed that two lead SNPs were significantly associated with SFHT. Candidate genes located within ± 250 kb of the corresponding SNP position were discovered, resulting in a total of 21 candidate genes on chromosome 10 and 18 candidate genes on chromosome 11. Based on previously reported function and haplotype analysis, Os10g0177200 (EF-HAND 2domain containing protein) as one candidate gene showed significant differences among groups of haplotypes. This candidate gene will be further evaluated for its function to determine whether it is useful for improving molecular breeding studies and developing new high temperature tolerant rice varieties.
고도화된 심사곡선법 기반 전원구성 분석 방안에 관한 연구
이예빈(Yebin Lee),허진(Jin Hur) 대한전기학회 2021 전기학회논문지 Vol.70 No.12
Mitigation strategies for climate change will require the reduced use of fossil fuels to generate electricity and replacement of these fuels with renewable generating resources. The screening curve and load duration curve were used to determine the optimal generation resource mix with renewable generating resources. In this paper, practical generation mix simulation was performed by applying screening curve method (SCM) including start-up effect to the National Renewable Energy Laboratory-118 (NREL-118). The applied SCM reflects the short-term operational impact of renewable energy and maintains its simplicity while increasing the accuracy of the optimal generation resource mix solution. In future, the elaborated SCM can be developed by considering other operational constraints such as ramp rate, minimum stable level, and heat rate.