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Wyświetlanie 1-15 z 16
Tytuł:
Predicting housing sale prices in Germany by application of machine learning models and methods of data exploration
Przewidywanie cen mieszkań w Niemczech z wykorzystaniem modeli uczenia maszynowego i metod eksploracji danych
Autorzy:
Kim, Chong Dae
Bedorf, Nils
Powiązania:
https://bibliotekanauki.pl/articles/32041024.pdf
Data publikacji:
2024
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
uczenie maszynowe
Niemcy
ekonomia
zbiór danych o rynku nieruchomości
big data
prognozowanie cen
machine learning
Germany
economics
real estate dataset
sale price prediction
Opis:
The prediction of real estate prices is a popular problem in the field of machine learning and often demonstrated in literature. In contrast to other approaches, which regularly focus on the US market, this paper investigates the biggest, German real estate dataset, with more than 1.5 million unique samples and more than 20 features. In this paper we implement and compare different machine learning models in respect to performance and interpretability to give insight in the most important properties, which contribute to the sale price. Our experiments suggest that the prediction of sale prices in a realworld scenario is achievable yet limited by the quality of data rather than quantity. The results show promising prediction scores but are also heavily dependent on the location, which leaves room for further evaluation.
Przewidywanie cen nieruchomości jest popularnym problemem w dziedzinie uczenia maszynowego i często przedstawianym w literaturze. W przeciwieństwie do innych podejść, które koncentrują się na rynku amerykańskim, niniejszy artykuł bada największy niemiecki zbiór danych dotyczących nieruchomości, zawierający ponad 1,5 mln unikatowych próbek i ponad 20 cech. W tym artykule wdrażamy i porównujemy różne modele uczenia maszynowego pod względem wydajności i możliwości interpretacji, aby uzyskać wgląd w najważniejsze
Źródło:
Kwartalnik Nauk o Przedsiębiorstwie; 2024, 71, 1; 107-122
1896-656X
Pojawia się w:
Kwartalnik Nauk o Przedsiębiorstwie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on Recovery of Cerium by Leaching Solvents from NiMH Waste Battery
Autorzy:
Kim, Boram
Kim, Dae-Weon
Choi, Hee Lack
Powiązania:
https://bibliotekanauki.pl/articles/2203709.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
NiMH
cerium recovery
rare earth composite powder
Opis:
In this study, a rare earth composite precipitation (NaREE(SO4)2H2O, REE: Ce, La, Nd, Pr) powder was prepared from spent nickel hydride batteries, and cerium hydroxide was separated from its constituent rare earth elements. As Ce(OH)3 can be oxidized more easily than other rare earth elements (La, Nd, and Pr), Ce3+ was converted to Ce4+ by injecting air into the leachate at 80°C for 4 h. The oxidized powder was leached using sulfuric and hydrochloric acids. Because Ce(OH)4 has low solubility, it can be separated from other elements. Therefore, the pH of the leaching solution was adjusted for selective precipitation. To determine the crystalline phase, recovery, and grade of the recovered Ce(OH)4, the powders were analyzed using X-ray diffraction, scanning electron microscopy, and inductively coupled plasma optical emission spectroscopy. The grade and recovery rates of the Ce(OH)4 powder recovered from the rare earth composite precipitate using sulfuric acid as the solvent were 95% and 97%, respectively, whereas those of the powder recovered using hydrochloric acid were 96% and 95%, respectively.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 103--106
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of Analcime Zeolite Using Al and Si from Waste Resources for the Removal of Pb/Cd Ions from Aqueous Solution
Autorzy:
Kang, Yubin
Im, Byoungyong
Choi, Jin-Ju
Yoon, Jin-Ho
Kim, Dae-Guen
Powiązania:
https://bibliotekanauki.pl/articles/2048875.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zeolite
analcime
waste resources
recycling
heavy metal removal
Opis:
Zeolites, minerals with the formula Mx/n[AlO2]x(SiO2)y] zH2O, are environmentally friendly materials used as water treatment adsorbents, gas adsorbents, and petrochemical catalysts. This study used a mixture of aluminum black dross and waste glass to synthesize zeolites via a hydrothermal synthesis and analyzed the effects of varying reaction time on phase changes under different synthesis conditions. With increased reaction times, a phase change from zeolite Na-P1 to analcime was observed; on employing hydrothermal synthesis at 150°C for 96 h, the majority of the crystalline structures changed into analcime. Heavy metal cation adsorption was tested to assess the applicability of the synthesized analcime to water treatment. Zeolite adsorption of at least 95% was observed for both Pd and Cd ions. Although a higher level of adsorption was observed for Pb ion than Cd ion, Cd ion was demonstrated to undergo relatively faster adsorption when tested under optimal pulp density at the same level of adsorption (95%).
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 67-72
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Fe-Mn Solid Solution Precursor Addition on Modified AA 7075
Autorzy:
Kim, Min Sang
Kim, Dae Young
Kim, Young Do
Choi, Hyun Joo
Kim, Se Hoon
Powiązania:
https://bibliotekanauki.pl/articles/2049310.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Zn-Mg alloy
solid solution precursor
mechanical properties
Opis:
This study suggests a new way to modify the size and morphology of Al-Fe phases in modified AA 7075 by using an Fe-Mn solid solution powder as the precursor. When Fe and Mn are added in the form of a solid solution, the diffusion of Fe and Mn toward the Al is delayed, thus altering the chemical composition and morphology of the precipitates. The fine, spherical precipitates are found to provide a good balance between strength and ductility compared to the case where Fe and Mn are separately added.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 783-787
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Flux on the Recovery Behavior of Valuable Metals during the Melting Process of Aluminum Can Scrap
Autorzy:
Han, Chulwoong
Kim, Yong Hwan
Kim, Dae-Geun
Lee, Man Seung
Powiązania:
https://bibliotekanauki.pl/articles/2048886.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum
can scrap
flux
gas bubbling filtration
GBF
recycling
Opis:
This study investigated the effect of flux type and amounts on recovery behavior of aluminum alloy during the melting process of Al can scrap. The heat treatment was conducted to remove the coating layer on the surface of can scrap at 500°C for 30 min. The molten metal treatment of the scrap was performed at 750°C in a high-frequency induction furnace with different flux types and amounts. It was observed that the optimum condition for recovery of Al alloy was to add about 3 wt.% flux with a salt and MgCl2 mixing ratio of 70:30 during melting process. The mechanical properties of recovered Al alloy were about 254.8 mPa, which is similar to that of the virgin Al5083 alloy.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 1023-1027
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of the Nickel-Cobalt-Manganese Cathode Material Using Recycled Nickel as Precursors from Secondary Batteries
Autorzy:
Jung, Hang-Chul
Han, Deokhyun
Kim, Dae-Weon
Ahn, Byungmin
Powiązania:
https://bibliotekanauki.pl/articles/2049177.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
secondary battery
nickel
recycling
Taylor reaction
cathode materials
Opis:
As the amount of high-capacity secondary battery waste gradually increased, waste secondary batteries for industry (high-speed train & HEV) were recycled and materialization studies were carried out. The precipitation experiment was carried out with various conditions in the synthesis of LiNi0.6Co0.2Mn0.2O2 material using a Taylor reactor. The raw material used in this study was a leaching solution generated from waste nickel-based batteries. The nickel-cobalt-manganese (NCM) precursor was prepared by the Taylor reaction process. Material analysis indicated that spherical powder was formed, and the particle size of the precursor was decreased as the reaction speed was increased during the preparation of the NCM. The spherical NCM powder having a particle size of 10 μm was synthesized using reaction conditions, stirring speed of 1000 rpm for 24 hours. The NCM precursor prepared by the Taylor reaction was synthesized as a cathode material for the LIB, and then a coin-cell was manufactured to perform the capacity evaluation.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 987-990
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
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:
Application of Hollow Fiber Supported Liquid Membrane for Extraction of Cobalt by Cyanex 272
Autorzy:
Swain, Basudev
Lee, Jae-Chun
Kim, Dae-Guen
Lee, Chan Gi
Powiązania:
https://bibliotekanauki.pl/articles/354650.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cyanex 272
hollow fiber supported
cobalt recovery
Opis:
Considering the advantages of hollow fiber supported liquid membrane (HFSLM), it has been applied for extraction of Co(II) with a motivation to extract cobalt from various waste resources. Extraction efficiency and transport behavior of Co(II) through HFSLM containing Cyanex 272 diluted in kerosene were investigated. Experiments were performed as a function of aqueous feed solution velocity (1000 mL/min) for both feed and strip, pH of feed solution in the range of 4.00-6.75, the carrier concentration of 25-1000 mol/m3, and acid concentration in strip solution of 1-500 mol/m3 on. The mass transfer rate or flux J Co(II), which is a function of metal concentration, volume of solution, and membrane area were analyzed. The optimum condition for extraction of Co(II) was pH of 6.00, Cyanex 272 concentration of 500 mol/m3 and H2 SO4 concentration of 100 mol/m3.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 845-850
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of Nickel Nanoparticles Using Nickel Raffinate Separated by Solvent Extraction from The Spent FeCl3 Etching Solution
Autorzy:
Park, Il-Jeong
Swain, Basudev
Kim, Dae-Weon
Kim, Geon-Hong
Han, Deok-Hyun
Jung, Hang-Chul
Powiązania:
https://bibliotekanauki.pl/articles/354453.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nickel
recycling
solvent extraction
chemical reduction
Opis:
FeCl3 bearing etching solution is mainly used for etching of metals used in shadow masks, PCBs and so on. Due course of Invar alloy etching process the FeCl3 bearing etching solution get contaminated with Ni2+ which affect adversely the etching efficiency. Hence, FeCl3 bearing etching solution discarded after several cycle of operation causes an environmental and economic problem. To address both the issues the etching solution was purified through solvent extraction and remained Ni2+ recovered by wet chemical reduction using hydrazine. For optimum Fe3+ extraction efficiency, various extraction parameter were optimized and size and morphology of the recovered pure Ni powder was analyzed. The reported process is a simple process to purify and recover Ni from industry etching solution.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 531-534
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linear operators preserving maximal column ranks of nonbinary boolean matrices
Autorzy:
Song, Seok-Zun
Yang, Sung-Dae
Hong, Sung-Min
Jun, Young-Bae
Kim, Seon-Jeong
Powiązania:
https://bibliotekanauki.pl/articles/728798.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
Boolean matrix
semiring
linear operator on matrices
congruence operator on matrices
maximal column rank of a matrix
Boolean rank of a matrix
Opis:
The maximal column rank of an m by n matrix is the maximal number of the columns of A which are linearly independent. We compare the maximal column rank with rank of matrices over a nonbinary Boolean algebra. We also characterize the linear operators which preserve the maximal column ranks of matrices over nonbinary Boolean algebra.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2000, 20, 2; 255-265
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exponential sums for symplectic groups and their applications
Autorzy:
Kim, Dae
Powiązania:
https://bibliotekanauki.pl/articles/1390545.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
exponential sum
additive character
symplectic group
Bruhat decomposition
maximal parabolic subgroup
Źródło:
Acta Arithmetica; 1999, 88, 2; 155-171
0065-1036
Pojawia się w:
Acta Arithmetica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gauss sums for O⁻(2n,q)
Autorzy:
Kim, Dae
Powiązania:
https://bibliotekanauki.pl/articles/1390898.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Gauss sum
multiplicative character
additive character
orthogonal group
Kloosterman sum
Bruhat decomposition
maximal parabolic subgroup
Źródło:
Acta Arithmetica; 1997, 80, 4; 343-365
0065-1036
Pojawia się w:
Acta Arithmetica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gauss sums for orthogonal groups over a finite field of characteristic two
Autorzy:
Kim, Dae
Park, Young
Powiązania:
https://bibliotekanauki.pl/articles/1390833.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Gauss sum
multiplicative character
additive character
orthogonal group
Kloosterman sum
Bruhat decomposition
maximal parabolic subgroup
Clifford algebra
Źródło:
Acta Arithmetica; 1997, 82, 4; 331-357
0065-1036
Pojawia się w:
Acta Arithmetica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Substrate Temperature on Magnetic and Structural Properties of RF Magnetron Sputtered Co-Cr Thin Films
Autorzy:
Baek, Jong-Sung
Kim, Yark-Yeon
Lim, Woo-Young
Kim, Yurng-Dae
Yu, Seong-Cho
Powiązania:
https://bibliotekanauki.pl/articles/1955470.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ss
Opis:
The present paper describes the substrate temperature T$\text{}_{s}$ dependence on magnetic and structural properties of Co-21 at.% Cr thin films deposited on the Corning glass substrate by RF magnetron sputtering. The properties of the samples, such as saturation magnetization M$\text{}_{s}$, in-plane squareness ratio S$\text{}_{∥}$, effective magnetic anisotropy field H'$\text{}_{k}$, spectroscopic splitting factor g, and hcp (002) peak intensity I$\text{}_{002}$, were examined by vibrating sample magnetometer, Q-band (≈ 33.9 GHz) ferromagnetic resonance measurements and X-ray diffractometry. Specially, the presence of the various ferromagnetic constituents in Co-Cr thin films are examined by the ferromagnetic resonance studies. With increasing T$\text{}_{s}$ from room temperature to 200°C, S$\text{}_{∥}$ increases from 0.08 to 0.56 but H'$\text{}_{k}$ decreases from 2530 Oe to -3900 Oe. Also I$\text{}_{002}$ decreases with increasing T$\text{}_{s}$. It is summarized that the perpendicular magnetic anisotropy and c-axis orientation of Co-Cr films are improved at lower substrate temperature.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 307-310
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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