26 research outputs found
Antioxidant and Anti-inflammatory Effects of Fractions from Angelica Keiskei
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Όλ¬Έ(μμ¬) --μμΈλνκ΅ λνμ :μνμμνκ³Ό,2008.2.Maste
(Le) heros et l`anti-heros dans Roberto Zucco de Bernard-Marie Koltes
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Όλ¬Έ(μμ¬) --μμΈλνκ΅ λνμ :λΆμ΄λΆλ¬Ένκ³Ό(λΆλ¬Ένμ 곡),2010.2.Maste
μ μ΄ κΈμ μ°νλ¬Ό νμ λλ Έκ²°μ μ ν©μ±κ³Ό λΆμ λ° μμ©
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Όλ¬Έ (λ°μ¬)-- μμΈλνκ΅ λνμ : ννμ물곡νλΆ, 2013. 8. ννν.μ΄μ°¨μ λλ
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νΉν μ±μ§λ€λ‘ μΈνμ¬ νκ³μμ κ΄μ¬ λ°κ³ μλ λ¬Όμ§μ΄λ€. κ·Έμ λ°λΌ, μ΅κ·Ό 2D μ μ΄κΈμ μ°νλ¬Ό ν©μ±μ κ΄ν λ€μν μ°κ΅¬κ° λ°νλκ³ μλ€. μ΄ νμ λ
Όλ¬Έμμλ μν₯μ μ κ·Όλ°©λ²μ ν΅ν΄ 2D κΈμ μ°νλ¬Ό λλ
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μλ₯Ό ν©μ±νκ³ μ΄λ₯Ό μμ©νλ ν λ°©λ²μ λνμ¬ κΈ°μ νμλ€.
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μμμ¦κ° ν¨κ³Όλ₯Όλ³΄μ¬μ£Όμλ€.
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Ένλ μ΄νΈμ ν¬κΈ°λ₯Όλ³νμμΌμ μ μ΄κ°λ₯νμμΌλ©°, κ·Έμκ²°μ ꡬ쑰λ μΈ΅μ κ±°λ¦¬κ° μ½ 0.56 λλ
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ΈμνΈ κ΅¬μ‘°λ₯Ό μ±κ³΅μ μΌλ‘ ν©μ±νμλ€. ν©μ±λ λλ
Έμ
μλ μ칼리 μ©μ‘κ³Όμ λ°μμ ν΅νμ¬ μμ½κ² μΈ΅μνκ΅¬μ‘°λ‘ μ‘°λ¦½ν μ μμμΌλ©°, μ΄ κ³Όμ μ ν΅νμ¬ λκ»λ λͺ¨μμ λ³ν μμ΄ μμμ±μ νλ©΄μ΄ μΉμμ±μΌλ‘ κ°μ§ λμλ€. μ΄λ κ² νλ©΄μ²λ¦¬λ λλ
ΈμνΈλ₯Ό λ¦¬ν¬ μ΄μ¨ λ°°ν°λ¦¬ μκ·Ήλ¬Όμ§λ‘ νμ©λμμΌλ©°, μμ 2Dꡬ쑰λ₯Ό νμ©νμ¬ μμ μ μ΄λ©° λΉ λ₯Έ μΆ©λ°©μ νΉμ±μ 보μ¬μ£Όμλ€.Two-dimensional (2D) nanocrystals have attracted tremendous attention from many researchers in various disciplines, because of their unique properties. Recently, several studies on the colloidal synthesis of 2D transition metal oxide nanostructures have been reported. This dissertation describes the synthesis and utilization of 2D metal oxide nanostructures via the bottom-up approach.
Firstly, lamellar-structured ultrathin manganese oxide nanoplates have been synthesized from the thermal decomposition of manganese(II) acetylacetonate in the presence of 2,3-dihydroxynaphthalene, which promoted 2D growth by acting not only as a strongly binding ligand but also as a structure-directing agent. The piβpi interactions between the 2,3-dihydroxynaphthalene promoted the synthesis of ultrathin manganese oxide nanoplates with thicknesses of ca. 1 nm. Additionally, the nanoplate widths could be controlled in the range 8β70 nm by controlling the piβpi interactions using various coordinating solvents. These hydrophobic manganese oxide nanoplates were ligand-exchanged with amine-terminated poly(ethyleneglycol) to generate water-dispersible nanoplates and applied to T1 contrast agents for magnetic resonance imaging (MRI). They exhibited very high longitudinal relaxivity value of up to 5.5 mMβ1 sβ1 due to the high concentration of manganese ions exposed on the surface.
Secondly, layered sodium manganese oxide nanomaterials were successfully synthesized using ultrathin manganese oxide nanoplates as precursors. The crystal structure of the nanostructured sodium manganese oxides was revealed to be a turbostratic structure. Further, the crystal structure of nanostructured sodium manganese oxide was successfully transformed to P2-Na0.7MnO2.05 by heat treatment. The prepared sodium manganese oxide materials were applied as cathode materials for sodium-ion batteries. The materials were shown to deliver high capacity with stable cycling performance.
Finally, ultrathin titanate nanosheets with a thickness of 0.5 nm were successfully synthesized from the non-hydrolytic solβgel reaction of tetraoctadecyl orthotitanate via the heat-up method. The synthesized nanosheets were easily assembled into layered structures by reaction with hydroxide ion in basic solutions such as LiOH, NaOH, and KOH. The layer-structured nanosheets were employed as anode materials for lithium ion batteries. The nanosheet materials showed fast rapid charging and discharging rates as well as stable cycling due to mechanical stability of the 2D structure. Ultrathin morphology of 2D titanate electrodes affected not only the diffusion path of Li+ ions but also the reaction mechanism from the insertion reaction of the crystal interior to the surface reaction. Furthermore, electrodes composed of layer-structured nanosheets exhibited superior cycling and rate performances.Chapter 1 Review of Chemical Synthesis and Applications of Two-Dimensional Metal Oxide Nanoparticles 1
1.1 Introduction 1
1.2 Synthesis of 2D Metal Oxide Nanocrystals 8
1.2.1 Exfoliation of Inorganic Layered Compounds 8
1.2.2 Direct Synthesis of Nanosheets using Colloidal Chemistry 15
1.2.2.1 Elimination of High Energy Facet During Crystal Structure 17
1.2.2.2 Application of Structure-Directing Agents for the Formation of Soft Templates. 21
1.2.2.3 Use of Ligands That Selectively Adhere as Surfactants to Specific Facets 27
1.3 Application of 2D Metal Oxide Nanostructures 31
1.3.1 Assembly Methods of Exfoliated Nanosheets 32
1.3.2 2D Nanostructures for Energy Storage Electrode Materials 38
1.4 Dissertation Overview 39
1.5 References 42
Chapter 2 Large-scale Synthesis of Ultrathin Manganese Oxide Nanoplates and their Applications to Highly Efficient T1 MRI Contrast Agents 49
2.1 Introduction 49
2.2 Experimental Section 52
2.3 Results and Discussion 58
2.4 Conclusion 89
2.5 References 90
Chapter 3 Synthesis of Layered Sodium Manganese Oxide for Sodium-Ion Battery Cathodes 95
3.1 Introduction 95
3.2 Experimental Section 97
3.3 Results and Discussion 100
3.4 Conclusion 120
3.5 References 121
β
Chapter 4 Two-dimensional Assemblies of Ultrathin Titanate Nanosheets for Lithium Ion Battery Anodes 124
4.1 Introduction 124
4.2 Experimental Section 127
4.3 Results and Discussion 131
4.4 Conclusion 152
4.5 References 153
Bibliography 157
κ΅λ¬Έ μ΄λ‘ (Abstract in Korean) 163Docto
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[μλ¬Έ]
This study bas been performed to provide basic data for activating quality improvement by identifying QI coordinators' individual characteristics, job characteristics, job satisfaction, organizational commitment an other related factors, with the QI coordinators as the study subject.
For this purpose questionnaires were mail to 95 QI coordinators of general hospital with more than 400 beds across the country, of which 65 coordinators answered. Main results of the study are as follows.
1. Major population-social characteristics of the subject are as follows by gender- female occupy 72.3%; by age- people who are aged over 31 under 40 occupy 63.1%, by the period of service- people who have worked for more than 5 years occupy 66.2%, By occupation- nurses occupy 55.4% and by income level- people who
earn over one million under two million Won per month occupy the highest percentage.
2. Individual characteristics for job satisfaction and organizational commitment were compared. It was revealed that the sense of self-efficiency was in direct proportion to job satisfaction. For the item, Lous of control, job satisfaction and
organizational commitment showed no significant difference.
3. The comparison of job characteristics showed that the active participation of QI coordinators in QI planning was in direct proportion to job satisfaction. Smooth communication among hospital staffs was leading to a high degree of job
satisfaction.
4. The comparison of support system revealed that the job satisfaction and the organizational commitment of QI coordinators were in direct proportion to job authority and status. The positive support for QI activities offered by Chief Executive Officers, seniors, and other hospital staff will enhance the job
satisfaction and organizational commitment of QI coordinators.
5. In the aspect of the variable of organizational culture, QI
coordinators'individualautonomy for their job was in direct proportion to job satisfaction and organizational commitment. For the formalization item, the organization in which the work was systematically and consistently managed showed higher organizational commitment. For the supportive communication item,
cooperation and high team spirit were in direct proportion to organizational commitment. For the identity, the organization with clear objectives values and belief showed positive job satisfaction and organizational commitment. For the performance item, positive organization in which one shared the sense of fairness in assessment or promotion opportunity displayed higher job satisfaction and organizational commitment. For the creativity/risk acceptance item, the organization which tried to solve difficulties actively shows higher organizational commitment.
6. The comparison of job satisfaction and organizational commitment for QI job characterestics showed that QI coordinators' job satisfaction was high when there was a department which is exclusively in charge of QI and when they were exclusively in charge of QI.
7. The result of LISREL for job satisfaction and organizational commitment showed that the sense of self-efficiency and the supportive communication culture had positive influence upon supportive job characteristics and the latter also had
positive influence upon organizational commitment. on the other hand, the performance reward culture positively influenced organizational commitment, being indifferent to supportive job characteres. However, supportive job characteristics was proved not to have any significant influence upon job satisfaction or
organizational commitment.prohibitio
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Όλ¬Έ(μμ¬)--μμΈλνκ΅ νκ²½λνμ :νκ²½κ³ννκ³Ό νκ²½κ³νμ 곡,1995.Maste