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Sam Kyu Noh,Jong Soo Kim,Jin Soo Kim,Jae Su Yu 한국진공학회(ASCT) 2014 Applied Science and Convergence Technology Vol.23 No.1
We have studied photovoltaic characteristics of single-junction GaAs solar cells with/without an MgF₂/ZnS anti-reflective coating (ARC) illuminated by low-density concentration (<10 suns). By the ARC deposition, the short-circuit current density (JSC) and the fill factor (FF)are increased by 5 mA/cm² and 5% at a standard illumination (1 sun), respectively, and the resulted conversion efficiency is enhanced by 45%. In contrast with the cell with no ARC showing a rapid degradation with increasing concentration power, the efficiency of ARC-deposited cell remains almost constant as (17.7±0.3)% regardless of the concentration. It informs that ARC treatment is very effective in GaAs concentrator solar cells.
Electrical Properties in Si-Doped GaN by Metal-Organic Chemical Vapor Deposition
Noh,Sam Kyu,Lee,Cheul Ro,Lee,In Hwan,Choi,In Hoon,Son,Sung Jin,Lim,Ki Young,Lee,Hyung Jae 대한전자공학회 1997 ICVC : International Conference on VLSI and CAD Vol.5 No.1
We have studied the doping efficiency and the Hall effect in undoped and Si-doped GaN epilayers grown on (0001) sapphire substrate by the low pressure metal-organic chmical vapor deposition technique. For undoped film, carrier concentration and Hall mobility are 4.2x10^(17) cm^(-3) and 1.2x10² ㎠/Vs, respectively. The doping efficiency is in the range of 0.4-0.8, and the empirical relation expressed as η=0.451og[Si]-8.1 has been obtained. The functional dependence may be due to a reduction of ionization energy resulted from the broadening of donor impurity band as the Si doping becomes heavier. An abrupt change in the mobility between undoped and Si-doped films has been observed. The mobility jump may be attributed to the mixed conduction by free electron with higher mobility and impurity band with lower mobility.
Noh, Sam Kyu,Kim, Jong Soo,Kim, Jin Soo,Yu, Jae Su The Korean Vacuum Society 2014 Applied Science and Convergence Technology Vol.23 No.1
We have studied photovoltaic characteristics of single-junction GaAs solar cells with/without an $MgF_2/ZnS$ anti-reflective coating (ARC) illuminated by low-density concentration (<10 suns). By the ARC deposition, the short-circuit current density ($J_{SC}$) and the fill factor (FF) are increased by $5mA/cm^2$ and 5% at a standard illumination (1 sun), respectively, and the resulted conversion efficiency is enhanced by 45%. In contrast with the cell with no ARC showing a rapid degradation with increasing concentration power, the efficiency of ARC-deposited cell remains almost constant as ($17.7{\pm}0.3$)% regardless of the concentration. It informs that ARC treatment is very effective in GaAs concentrator solar cells.
Divided Disk Cache and SSD FTL for Improving Performance in Storage
Jung Kyu Park,Jun-yong Lee,Sam H. Noh 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.1
Although there are many efficient techniques to minimize the speed gap between processor and the memory, it remains a bottleneck for various commercial implementations. Since secondary memory technologies are much slower than main memory, it is challenging to match memory speed to the processor. Usually, hard disk drives include semiconductor caches to improve their performance. A hit in the disk cache eliminates the mechanical seek time and rotational latency. To further improve performance a divided disk cache, subdivided between metadata and data, has been proposed previously. We propose a new algorithm to apply the SSD that is flash memory-based solid state drive by applying FTL. First, this paper evaluates the performance of such a disk cache via simulations using DiskSim. Then, we perform an experiment to evaluate the performance of the proposed algorithm.
Structural and Optical Characteristics of Laterally Self-Aligned InGaAs Quantum Dots
김준오,Sam Kyu Noh,J. W. Choe,S. J. Lee,S. M. Choi,Y. H. Ryu 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.3
The structural and the optical characteristics of laterally self-aligned InGaAs/GaAs quantum dots (QDs) have been analyzed through mutual comparisons among four samples with different parameters. An anisotropic arrangement develops with increasing number of stacks, and high-temperature capping allows isolated QDs to be spontaneously organized into a one-dimensionally-aligned chainlikeshape over a few μm. Moreover, the migration time allowed by growth interruption plays an additional important role in the chain arrangement of QDs. The QDs capped at high temperature exhibit blue shifts in the emission energy, which may be attributed to a slight outdiffusion of In from the InGaAs QDs. An estimate from the energy shift reveals that the compositional variation of In is 0.05.
A Practical Coverage Algorithm for Intelligent Robots with Deadline Situations
Jung Kyu Park,Heung Seok Jeon,Sam H. Noh,Jung Hwan Park,Ryumduck Oh 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
Coverage algorithm is one of the core technologies required for intelligent robots such as cleaning robots, harvesting robots, painting robots and lawn mowing robots. Although many smart coverage algorithms have been proposed, to the best of our knowledge, all of them make the same assumption that they have sufficient time to cover the entire target area. However, the time to completely cover the whole target area may not always be available. Therefore, in this paper, we propose another new coverage scheme, which we call the DmaxCoverage algorithm, that decides the coverage path by considering the deadline for coverage. This approach can be beneficial when the time for the coverage is not sufficient to cover the entire target area. Experimental results show that the DmaxCoverage algorithm outperforms previous algorithms for these situations.
기관내삽관시 전기 화상 환자에 대한 Vecuronium의 근이완 효과
김규삼,권은정,이혜정,배성진,노규정,정해정 대한마취과학회 1999 Korean Journal of Anesthesiology Vol.36 No.1
Background : In inducing anesthesia for burn patients, nondepolarizing muscle relaxant (NDMR) is usually used, because succinylcholine, a widely used muscle relaxant may cause hyperkalemia. It is well known that because burn patients show resistance to NDMR, a high dose of NDMR is needed for them. In this study, we wanted to know whether there is significant difference of the relaxation effect between 0.1 mg/Kg and 0.15 mg/Kg dose's of vecuronium, and between burn and unburn patients. Methods : Subjects are 40 male patients having 1 or 2 ASA physical status (20 are burn patients and the other 20 are unburn patients). We divided them into 4 groups; 1) Group BI (burn patients, vecuronium 0.1 mg/Kg) 2) Group BII (burn Pts, vecuronium 0.15 mg/Kg) 3) Group UBI (unburn Pts, vecuronium 0.1 mg/Kg) 4) Group UBII (unburn Pts, vecuronium 0.15 mg/Kg). Average onset times (time from injection of vecuronium to zero first twitch height (T1)) were measured and intubating condition were scored on 0 to 4 scale. Results : The onset time of vecuronium and distribution of intubation scores didn't show statistical differences among 4 groups. Conclusion : The onset time of vecuronium and intubating condition in burn patients dosen't show a difference from unburn patient. (Korean J Anesthesiol 1999; 36: 21∼26)