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Wyszukujesz frazę "Lee, Young" wg kryterium: Autor


Tytuł:
The difference in under-expenditure of the social welfare budget in Korea
Autorzy:
Lee, Young
Powiązania:
https://bibliotekanauki.pl/articles/616454.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
social welfare budget
multi-variant ARIMA model
budżet pomocy społecznej
wielowariantowy model ARIMA
Opis:
Przedmiotem badania jest relacja między wydatkami niekwalifikowanym budżetu pomocy społecznej w ramach ograniczonego budżetu Korei w okresie 1965–2008. W artykule wskazano, że pomoc publiczna i wydatki na usługi społeczne są nie do porównania z wydatkami ubezpieczenia narodowego zgodnie z wielowariantowymi modelami ARIMA Box-Jenkins. Ich obecność poddana współmierności jest fałszywa ze względu na wpływ czynników polityczno-gospodarczych. Rezultaty badania w tym artykule mogą wnieść wkład w rozwój teorii budżetowej i polityk budżetowych. Jednak niektóre rezultaty badań powstałych w oparciu o modele ARIMA mogły być nieadekwatne do poddania interpretacji w ramach istniejących teorii i formułują przypuszczenia takie jak te z dziewięcioletnim opóźnieniem, etc. W związku z tym dalsze badania są konieczne.
This research investigates the relationship between under-expenditure of the social welfare budget within a limited budget and the determinants that have an effect on them. Relationships and determinants between under-expenditure of the social welfare budget have generally received relatively little attention from academics. The aim of this article is to examine the differences in the under-expenditures of the social welfare budget in the Korea between 1965 and 2008. It is shown that public assistance and social service expenditures are not comparable with national insurance expenditure according to the Box-Jenkins’ multi-variant ARIMA models. The appearance of them being commensurate is spurious because it is affected by political economic factors. The research findings in this paper can contribute to the development of budgetary theory and budgetary politics. However some findings within in the ARIMA models were incapable of being interpreted within existing theories and conjecture such as those with a 9 year time lag, etc. Further studies are therefore required.
Źródło:
Przegląd Politologiczny; 2015, 3; 21-39
1426-8876
Pojawia się w:
Przegląd Politologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Korean Avant-garde Performance Art from the 1960s to the 1980s in the Trajectory of the South Korean Democratization
Autorzy:
Lee, Ah-Young
Powiązania:
https://bibliotekanauki.pl/articles/1011604.pdf
Data publikacji:
2020
Wydawca:
Akademia Sztuk Pięknych w Gdańsku
Tematy:
performance art
art and politics
democracy
dissident art
art and political history
avant-garde
Opis:
The article describes the political and social conditions in South Korea from the mid-1960s and the period of the military dictatorship. It was also a time of industrialization and civilization development of the country, and along with the modernization trends, new forms of art appeared. They have been adapted to express social tensions related to the country's development. The new art took conceptual, action, happening forms. The history of the struggle and overcoming the military dictatorship and the non-democratic regime is related to the development of modern art. And what should be emphasized is its most progressive, artistically radical forms of expression.
Artykuł opisuje warunki polityczno-społeczne w Korei Południowej, począwszy od połowy lat sześćdziesiątych i okresu dyktatury militarnej. Był to zarazem czas industrializacji i cywilizacyjnego rozwoju kraju, a wraz z trendami modernizacyjnymi pojawiły się nowe formy sztuki. Zostały one zaadoptowane do wyrażania napięć społecznych związanych z rozwojem kraju. Nowa sztuka przyjmowała formy konceptualne i akcyjne, happeningowe. Historia walki i przezwyciężenia dyktatury wojskowej i nie-demokratycznego regime jest związana z rozwojem sztuki współczesnej. I to, co należy podkreślić, jej najbardziej progresywnych, radykalnych artystycznie form ekspresji.
Źródło:
Sztuka i Dokumentacja; 2020, 22; 63-77
2080-413X
Pojawia się w:
Sztuka i Dokumentacja
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Homogeneous Dispersion of Yttrium Oxide Particles in Nickel-Based Superalloy by High Pressure Homogenizing and Ball Milling Method
Autorzy:
Byun, Jongmin
Lee, Young-In
Oh, Sung-Tag
Powiązania:
https://bibliotekanauki.pl/articles/2049123.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ni-based superalloy
Y2O3 dispersion
high pressure homogenizer
spark plasma sintering
microstructure
Opis:
An optimum route to fabricate the Ni-based superalloy with homogeneous dispersion of Y2O3 particles is investigated. Ni-based ODS powder was prepared by high-energy ball milling of gas-atomized alloy powders and Y2O3 particles treated with a high-pressure homogenizer. Decrease in particle size and improvement of dispersion stability were observed by high-pressure homogenization of as-received Y2O3 particles, presumably by the powerful cavitation forces and by collisions of the particles. Microstructural analysis for the ball-milled powder mixtures reveal that Ni-based ODS powders prepared from high-pressure homogenization of Y2O3 particles exhibited more fine and uniform distribution of Ni and Y elements compared to the as-received powder. These results suggested that high-pressure homogenization process is useful for producing Ni-based superalloy with homogeneously dispersed oxide particles.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 1055-1058
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Pyrolysis Conditions on the Physicochemical Properties of Graphitic Carbon Nitride for Visible-Light-Driven Photocatalytic Degradation
Autorzy:
Kim, Jeong Hyun
Ji, Myeongjun
Ryu, Cheol-Hui
Lee, Young-In
Powiązania:
https://bibliotekanauki.pl/articles/351503.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
g-C3N4
pyrolysis
polymerization
synthesis condition
photocatalysis
Opis:
Graphitic carbon nitride (g-C3 N4 ) is an attractive photocatalyst, however, its practical photocatalytic applications are still faced with huge challenges. The aim of this research is to identify the correlation between synthetic conditions and properties of the g-C3 N4 and derive an optimum synthesis condition for improving photocatalytic activities of the g-C3 N4. In this study, novel and versatile g-C3 N4 nanosheets were synthesized by the simple thermal pyrolysis of urea. In the synthesis process, the pyrolysis temperature and the heating rate, which can have the most significant influence on the structures and properties of g-C3 N4, were set as variables, and the effects were systematically investigated. When synthesized at a relatively high temperature, the amount of material being synthesized is reduced, however it has been found to represent optical properties suitable for highly efficient photo-catalyst by the increase in the thickness and defects formed in the g-C3 N4nanosheets. The photocatalytic degradation experiment of MB dyes indicated that the highest degradation of 95.2% after the reaction for 120 min was achieved on the g-C3 N4 nanosheets synthesized at 650°C.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1111-1116
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of Y2O3-Dispersed W Powders Prepared by Ultrasonic Spray Pyrolysis and Polymer Solution Route
Autorzy:
Jo, Hyeonhui
Lee, Young-In
Suk, Myung-Jin
Jeong, Young-Keun
Oh, Sung-Tag
Powiązania:
https://bibliotekanauki.pl/articles/2049335.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tungsten
Y2O3 dispersion
ultrasonic spray pyrolysis
wet chemical route
Opis:
The nano-sized Y2O3 dispersed W composite powder is prepared by ultrasonic spray pyrolysis of a tungsten precursor using ammonium metatungstate hydrate and a polymer addition solution method using Y-nitrate. XRD analysis for calcined powder showed the formation of WO2 phase by partial oxidation of W powder during calcination in air. The TEM and phase analysis for further hydrogen reduction of calcined powder mixture exhibited that the W powder with a uniform distribution of Y2O3 nanoparticles can be successfully produced. These results indicate that the wet chemical method combined with spray pyrolysis and polymer solution is a promising way to synthesis the W-based composites with homogeneous dispersion of fine oxide particles.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 799-802
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphology Control of One-Dimensional Gallium Nitride Nanostructures by Modulating the Crystallinity of Sacrificial Gallium Oxide Templates
Autorzy:
Ko, Yun Taek
Park, Mijeong
Park, Jingyeong
Moon, Jaeyun
Choa, Yong-Ho
Lee, Young-In
Powiązania:
https://bibliotekanauki.pl/articles/2049246.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
GaN
nanofiber
nanotube
electrospinning
chemical transformation
Opis:
In this study, we demonstrated a method of controllably synthesizing one-dimensional nanostructures having a dense or a hollow structure using fibrous sacrificial templates with tunable crystallinity. The fibrous Ga2O3 templates were prepared by calcining the polymer/gallium precursor nanofiber synthesized by an electrospinning process, and their crystallinity was varied by controlling the calcination temperature from 500°C to 900°C. GaN nanostructures were transformed by nitriding the Ga2O3 nanofibers using NH3 gas. All of the transformed GaN nanostructures maintained a one-dimensional structure well and exhibited a diameter of about 50 nm, but their morphology was clearly distinguished according to the crystallinity of the templates. When the templates having a relatively low crystallinity were used, the transformed GaN showed a hollow nanostructure, and as the crystallinity increased, GaN was converted into a denser nanostructure. This morphological difference can be explained as being caused by the difference in the diffusion rate of Ga depending on the crystallinity of Ga2O3 during the conversion from Ga2O3 to GaN. It is expected that this technique will make possible the tubular nanostructure synthesis of nitride functional nanomaterials.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 709-712
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dilatometric Analysis of the Sintering Behavior of Bi2Te3 Thermoelectric Powders
Autorzy:
Han, Ju-Yeon
Byun, Jong Min
Lee, Young-In
Choi, Byung Joon
Kim, Hogyoung
Oh, Sung-Tag
Powiązania:
https://bibliotekanauki.pl/articles/354899.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Bi2Te3
dilatometric analysis
sintering behavior
microstructure
Opis:
The sintering behavior of p-type bismuth telluride powder is investigated by means of dilatometric analysis. The alloy powders, prepared by ball milling of melt-spun ribbons, exhibit refined and flake shape. Differential thermal analysis reveals that the endothermic peak at about 280°C corresponds to the melting of bismuth, and peaks existing between 410°C and 510°C are presumably due to the oxidation and crystallization of the powder. The shrinkage behavior of ball-milled powders was strongly dependent of heating rate by the thermal effect exerted on specimens. In the case of 2°C/min, the peak temperature for the densification is measured at 406°C, while the peak temperature at a heating rate of 20°C/min is approximately 443°C. The relative density of specimen pressureless-sintered at 500°C exhibited relatively low value, and thus further study is required in order to increase the density of sintered body.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1117-1120
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of W Composite Powder with La2O3-Y2O3 Nano-Dispersoids by Ultrasonic Spray Pyrolysis
Autorzy:
Heo, Youn Ji
Lee, Eui Seon
Kim, Jeong Hyun
Lee, Young-In
Jeong, Young-Keun
Oh, Sung-Tag
Powiązania:
https://bibliotekanauki.pl/articles/2174558.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
W composite powder
La2O3-Y2O3 dispersion
ultrasonic spray pyrolysis
polymeric additive solution method
Opis:
An optimum route to synthesis the W-based composite powders with homogeneous dispersion of oxide nanoparticles was investigated. The La2O3 dispersed W powder was synthesized by ultrasonic spray pyrolysis using ammonium metatungstate hydrate and lanthanum nitrate. The dispersion of Y2O3 nanoparticles in W-La2O3 powder was carried out by a polymer addition solution method using yttrium nitrate. XPS and Tem analyses for the composite powder showed that the nano-sized La2O3 and Y2O3 particles were well distributed in W powder. This study suggests that the combination processing of ultrasonic spray pyrolysis and polymeric additive solution is a promising way to synthesis W-based composite powders.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1507--1510
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple synthesis of Black TiO2 Nanofibers Via Calcination in Inert Atmosphere
Autorzy:
Ji, Myeongjun
Kim, Eung Ryong
Park, Mi-Jeong
Jeon, Hee Yeon
Moon, Jaeyun
Byun, Jongmin
Lee, Young-In
Powiązania:
https://bibliotekanauki.pl/articles/2174573.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
black TiO2
nanofibers
electrospinning
calcination
atmosphere
Opis:
Black TiO2 nanofibers have recently emerged as a promising material that has both advantages of black metal oxide and one-dimensional nanostructure. However, current reduction-based synthesis approaches are not compatible with practical applications because these processes require high process costs, complicated processes, and sophisticated control. Therefore, it is still necessary to develop a simple and facile method that can easily introduce atomic defects during the synthesis process. This work suggests an electrospinning process with an antioxidant and subsequent calcination process for the facile synthesis of black TiO2 nanofibers. The synthesized black TiO2 nanofiber has an average diameter of 50.3 nm and a rutile structure. Moreover, this nanofiber represented a noticeable black color and a bandgap of 2.67 eV, clearly demonstrating the bandgap narrowing by the introduced atomic defects.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1481--1486
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of NF3 Gas on Stabilization of Alkaline Earth Metal-Cu Mordenite Catalysts During N2O Decomposition Reaction
Autorzy:
Seo, Minhye
Lee, Soo-Young
Cho, Sung-Su
Song, Hyoung Woon
Kim, Hyun-Kyung
Kim, Dong Soo
Lee, Sungkyu
Powiązania:
https://bibliotekanauki.pl/articles/947575.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nitrous oxide
N2O
nitrofluorine three
NF3
perfluorocompounds
PFCs
direct decomposition
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 695-700
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Ball on SPS Characteristics of Ti-Al-Nd Powders Prepared by High Energy Ball Milling
Autorzy:
Lee, Hyunseung
Rhee, Hoseong
Lee, Sangsoo
Chang, Si Young
Powiązania:
https://bibliotekanauki.pl/articles/2203712.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high energy ball milling
STS
zirconia ball
SPS
Ti-Al-Nd alloy
microhardness
Opis:
The effects of different types of balls on spark plasma sintering (SPS) characteristics of high energy ball milled Ti-48wt% Al-4wt% Nd powders were investigated. After ball milling with STS balls and zirconia balls at 800 rpm for 3 h in argon atmosphere, both powders showed shape factors of about 0.8, but their average powder sizes differed respectively at approximately 11 µm and 5 µm. From XRD results, only the peaks of pure Ti, Al and Nd were detected in both powders. The obtained Ti-Al-Nd powders were consolidated by SPS technique at 1373 K for 15 min under a pressure of 50 MPa in vacuum, resulting in high density over 99%. EDS and XRD analyses indicated the formation of binary phases such as TiAl3, TiAl, Ti3Al5, and NdAl3 after SPS in both cases of STS and zirconia balls, while the ternary Ti-Al-Nd phase was detected only in the case of zirconia balls. The size of second phases was slightly smaller in the case of zirconia balls. The microhardness of the sample was 790 Hv with zirconia balls and 540 Hv with STS balls.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 81--84
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrasound-Assisted Extractions for Improving the Recovery of Phenolics and Charantin from Bitter Melon and for Increasing the Antioxidant, Antidiabetic and Anti-Obesity Activities of Its Extracts
Autorzy:
Lee, Jin Ju
Yoon, Kyung Young
Powiązania:
https://bibliotekanauki.pl/articles/2051043.pdf
Data publikacji:
2022-06-02
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
bitter melon
ultrasound-assisted extraction
charantin
phenolic compounds
antioxidant activity
antidiabetic activity
Opis:
Bitter melon is rich in bioactive compounds and has a significant potential for commercial use as a functional food material. Its bioactive compound-rich extract was prepared using probe- or bath-type ultrasound-assisted extraction (UAE) with 60% (v/v) ethanol or distilled water. The composition and bioactivity of the extracts prepared using UAE was compared with those obtained by conventional extraction methods, such as autoclave extraction, ethanol extraction, and hot-water extraction. Although the yield of the autoclave extraction was the highest, the extracts obtained using UAE and aqueous ethanol exhibited a higher total phenolic content, antioxidant activity, antidiabetic activity (α-amylase and α-glucosidase inhibitory activities), and pancreatic lipase inhibitory activity than the conventional extracts. In particular, UAE with probe system and aqueous ethanol (UAE-P-E) was effective for extracting bioactive compounds, such as phenolics (total phenolic content of 18.73 mg GAE/g extract) and charantin (28.56 mg/g extract). Among all extracts, this prepared by UAE-P-E showed the highest DPPH radical scavenging activity (IC50 of 0.55 mg/mL), ferric reducing antioxidant power (250.5 μmol/g extract), and pancreatic lipase inhibitory activity (76.38% at a concentration of 3.0 mg/mL). These results suggest that bioactive compound-rich extracts from bitter melon obtained using UAE, especially UAE-P-E, are expected to have high application potential as a functional food material, and are also expected to be used as natural antioxidant, antidiabetic, and anti-obesity agents.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2022, 72, 2; 141-150
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gas Atomization Parametric Study on the VIGA-CC Based Synthesis of Titanium Powder
Autorzy:
Kim, Dae-Kyeom
Kim, Young-Il
Lee, Hwaseon
Kim, Young Do
Lee, Dongju
Lee, Bin
Kim, Taek-Soo
Powiązania:
https://bibliotekanauki.pl/articles/355636.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
powder production
gas atomization
titanium
orifice
Opis:
With the recent advancement in technology for titanium metal powder injection molding and additive manufacturing, high yield and good flowability powder production is needed. In this study, titanium powder was produced through vacuum induction melting gas atomization with a cold crucible, which can yield various alloy compositions without the need for material pretreatment. The gas behavior in the injection section was simulated according to the orifice protrusion length for effective powder production, and powder was prepared based on the simulation results. The gas distribution changes with the orifice protrusion length, which changes the location of the recirculation zone and production yield of the powder. The produced powders had a spherical morphology, and the content of impurities (N, O) changed with the injected-gas purity.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 997-1000
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Knots in $S^2 x S^1$ derived from Sym(2, ℝ)
Autorzy:
Lee, Sang
Lim, Yongdo
Park, Chan-Young
Powiązania:
https://bibliotekanauki.pl/articles/1205027.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
geodesic
symmetric matrix
Shilov boundary
2-periodic knot
Opis:
We realize closed geodesics on the real conformal compactification of the space V = Sym(2, ℝ) of all 2 × 2 real symmetric matrices as knots or 2-component links in $S^2 × S^1$ and show that these knots or links have certain types of symmetry of period 2.
Źródło:
Fundamenta Mathematicae; 2000, 164, 3; 241-252
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Temperature Oxidation Property of Ni Based Superalloy CM247LC Produced Via Selective Laser Melting Process
Autorzy:
Lee, Jung-Uk
Kim, Young-Kyun
Seo, Seong-Moon
Lee, Kee-Ahn
Powiązania:
https://bibliotekanauki.pl/articles/2203720.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ni-based superalloy
selective laser melting
directional solidification
microstructure
high temperature oxidation property
Opis:
CM247LC alloy was manufactured by using selective laser melting (SLM) process, one of the laser powder bed fusion (L-PBF) methods. The hot isostatic pressing (HIP) process was additionally conducted on the SLM-built CM247LC to control its microstructures and defects. The high temperature oxidation property was investigated, and it was compared with conventional DS247LC sample (reference) prepared via the directional solidification process. The L-PBF HIP sample showed blocky-type MC carbides generated along the grain boundary with average size of about 200 nm. A semi-spherical primary γ' phase of size 0.4-1.0 μm was also observed inside the grains. Moreover, the DS247LC sample displayed a coarse eutectic γ' phase and many script-type MC carbides. Furthermore, cuboidal-type γ' with an average size of about 0.5 μm was detected. High-temperature oxidation tests were conducted at 1000°C and 1100°C for 24 hours. The results at 1100°C oxidation temperature showed that the measured oxidation weight gains for HIP and DS247LC were 1.96 mg/cm2 and 2.26 mg/cm2, respectively, indicating the superior high-temperature oxidation resistance of the L-PBF HIP sample. Based on the above results, a high-temperature oxidation mechanism of the CM247LC alloys manufactured by the SLM process and the directional solidification process has been proposed.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 107--112
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł

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