1,725,822 research outputs found
Seung-Hun Lee
No full text학위논문(석사)--아주대학교 일반대학원 :재료공학과,2011. 2In graphite and graphitized carbonaceous materials, it is known that they have different Li storage capacity and electrochemical properties depending on the structures. In particular, graphene which have outstanding physical, chemical and electrochemical properties was the most attention for alternative anode material of Li-ion batteries.Abstract 1
List of Tables 3
List of Figures 4
1. 서론 7
2. 연구 배경 11
2.1 흑연계 물질의 나노구조 18
2.2 그래핀 연구동향 23
3. 선행기술 조사 24
3.1 그래핀 제조방법 24
3.2 흑연막 전해박리에 의한 그래핀 제조 26
4. 실험 방법 27
4.1 그래핀 제조 27
4.1.1 전해박리에 의한 흑연막 표면 개질 27
4.1.2 전해박리에 의한 그래핀 나노시트 제조 31
4.1.3 전기화학적 물성 측정 방법 34
4.1.4 그래핀 나노시트의 물성 평가 35
5. 실험 결과 및 고찰 36
5.1 그래핀 나노시트에 의한 흑연막 표면 개질 36
5.2 그래핀 나노시트 물성 측정 46
6. 결론 61
Reference 62Maste
Multi-characteristics parameter design: A Desirability function approach based on process capability indices
No full textA PCI (Process Capability Index)-based desirability function approach for multi-characteristics parameter design problems is presented. Three types of PCIs, including the one newly developed for the-nominal-the-best characteristic, are employed depending on the type of performance characteristics, and a new desirability function (i.e. a logistic function) is proposed for the PCIs. The weighted geometric mean of the desirabilities for PCIs is then used as an aggregated performance measure for compromising the
con icts among the levels of a design parameter. Using PCIs and a logistic desirability function for solving a multi-characteristics parameter design problem is relatively simple and easy to implement. In addition, the proposed approach yields dispersion-sensitive results regardless of the type of performance characteristics. The developed approach is illustrated with an example from a drawing process of optical fiber, and compared with the existing desirability function approaches
A note on poly-Bernoulli polynomials arising from umbral calculus
No full textIn this paper, we give some recurrence formula and new and interesting 732 Dae San Kim, Taekyun Kim and Sang-Hun Lee identities for the poly-Bernoulli numbers and polynomials which are derived from umbral calculus
Electrodeposition of tin and tin chalcogenides from tin (II) methanesulfonate solution / Koay Hun Lee
Get PDFThere were many researches had been done by scientists on electro-deposition of tin and tin chalcogenide thin films. Most of them were using SnCl2, Sn(EDTA), Sn(OH)2, SnSO4 and so on. But, there are not many studies have been done on the tin sulfoselenide (SnSSe) which is the derivative of the tin thin films. Therefore, an alternative for the tin ion source is tin (II) methanesulfonate to fabricate the tin and tin chalcogenide thin films. The process of electrodeposition of tin and tin chalcogenide thin films on the copper substrate by using a solution of tin (II) methanesulfonate (CH3SO3)2Sn (50 wt. % in H2O), natrium thiosulfate (Na2S2O3), natrium selenite (Na2SeO3) and methane sulfonic acid (CH3SO3H) is described. The chemical bath contained 0.01M tin (II) methanesulfonate, 0.01M natrium thiosulfate, 0.01M natrium selenite (Na2SeO3), and 40ml of methane sulfonic acid (�99.5%) are prepared. Cyclic
voltammetry (CV) experiments are conducted using potentiostat and galvanostat to study the reduction and oxidation potential. The CV experiments are conducted under
different potential. The electrodeposition of Sn, SnS and SnSSe are observed and described. The characterization of the coated tin and tin chalcogenide thin films on the
copper substrate were studied by using EDAX, SEM, AFM, XRF and XRD. The results of the characterization are studied.
The electrodeposition of tin from tin (II) methanesulfonate solution with 1-butyl-1-methylpyrrolidinium trifluoro methanesulfonate (BMPOTF) ionic liquid at varying concentration was studied under the room temperature. Cyclic Voltammetry served to characterize the electrochemical behaviour of tin reduction and oxidation. The diffusion coefficient of stannous ions in the mixture of BMPOTF ionic liquid and MSA based electrolyte obtained via Randles-Sevcik was approximately 2.11 x 10-7cm2.
Electroplating on copper panel was conducted under different current densities to determine BMPOTF based tin plating solution current efficiency. Mixture of BMPOTF
and MSA based tin plating solution gave current efficiency as high as 99.9%. The deposit morphology of the mixture BMPOTF and MSA based tin coated substrates was observed by using EDX and SEM. A dense, fine and polygonal grain structure was obtained. Voltammetry and chronoamperometry for the electrodeposition of tin from tin (II) methanesulfonate mixed with ionic liquid and methane sulfonic acid at room temperature was studied. Cyclic voltammetry shows redox waves of tin (II), which proves that the electrodeposition of tin from tin (II) methanesulfonate is a diffusioncontrolled process. The diffusion coefficient of tin (II) ions in the solvent mixture showed good agreement from both voltammetry and chronoamperometry results. The diffusion coefficient of tin (II) in the mixture was much smaller than in aqueous solution, and it depends on the anion of the ionic liquid
Intracellular, in vitro somatic membrane potential recordings from whole cell patch clamped rodent hippocampal CA1 neurons
No full textThis data set contains the raw data files of current injection sweeps from somatic injections of the experimental cells (mouse and rat under standard “control” in vitro recording conditions) that were used to constrain the model cells of the model CA1 neural network published in: Marianne J. Bezaire, Ivan Raikov, Kelly Burk, Dhrumil Vyas, and Ivan Soltesz. Interneuronal mechanisms of hippocampal theta oscillations in full-scale models of the CA1 circuit. Under Review, 2016. Results from the experiments are described in:
Sang-Hun Lee, Ivan Marchionni, Marianne Bezaire, Csaba Varga, Nathan Danielson, Matthew Lovett-Barron, Attila Losonczy, and Ivan Soltesz. Parvalbumin-positive basket cells differentiate among hippocampal pyramidal cells. Neuron, 82(5):1129–1144, 2014. doi: 10.1016/j.neuron.2014.03.034.
Esther Krook-Magnuson, Lillian Luu, Sang-Hun Lee, Csaba Varga, and Ivan Soltesz. Ivy and neurogliaform interneurons are a major target of µ-opioid receptor modulation. The Journal of Neuroscience, 31(42):14861–14870, 2011. doi: 10.1523/JNEUROSCI.2269-11.2011.
Sang-Hun Lee, Csaba Foldy, and Ivan Soltesz. Distinct endocannabinoid control of GABA release at perisomatic and dendritic synapses in the hippocampus. J. Neurosci., 30:7993–8000, 2010. doi: 10.1523/JNEUROSCI.6238-09.2010
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Supplemental Material - Predicting Mortality Following Odontoid Fracture Fixation in Elderly Patients: CAADS-16 Score
No full textSupplemental Material for Predicting Mortality Following Odontoid Fracture Fixation in Elderly Patients: CAADS-16 Score by William ElNemer, Eric Solomon, Michael Raad, Amit Jain, and Sang Hun Lee in Global Spine Journal.</p
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