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    Wyświetlanie 1-7 z 7
    Tytuł:
    Effect of T6 Heat Treatment on the Scratch Wear Behavior of Extruded Al-12wt.%Si Alloy
    Autorzy:
    Kang, Yeon-Ji
    Kim, Jong-Ho
    Hwang, Jong-Il
    Lee, Kee-Ahn
    Powiązania:
    https://bibliotekanauki.pl/articles/356776.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-12wt.%Si alloy
    scratch test
    wear-resistance
    T6 heat treatment
    Opis:
    This study investigated the effect of T6 heat treatment on the microstructure and scratch wear behavior of hypoeutectic Al-12wt.%Si alloy manufactured by extrusion. Microstructural observation identified spherical eutectic Si phases before and after the heat treatment of alloys (F, T6). Phase analysis confirmed Al matrix and Si phase as well as Al2Cu and Al3Ni, Mg2Si in both alloys. In particular, Al2Cu was finer and more evenly distributed in T6 alloy. This resulted in Vickers hardness of T6 alloy that was 2.3 times greater compared to F alloy. The scratch wear test was conducted using constant load scratch test (CLST) mode and multi-pass scratch test (MPST) mode. The scratch coefficient and worn out volume obtained by such were used to evaluate wear properties before and after heat treatment. In the case of T6 alloy, its scratch coefficient was lower than F alloy in all load ranges. After 15 repeated tests to measure worn out volume, F alloy and T6 alloy measured 1.2×10-1 mm3 and 7.8×10-2 mm3, respectively. In other words, the wear resistance of T6 alloy were confirmed to be better than those of F alloy. In addition, this study attempted to identify the microstructural factors that contribute to the better scratch wear resistance of T6 alloy and wear mechanism from surface and cross-section observations after the wear tests.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 617-622
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Social science education offered by Chinese Departments in Korean universities
    Autorzy:
    Nam, Jong-ho
    Kim, Insik
    Kim, Yongdeog
    Powiązania:
    https://bibliotekanauki.pl/articles/2004959.pdf
    Data publikacji:
    2016-06-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    Chinese studies in Korea
    Chinese social sciences
    Chinese language and literature
    two-track curricula
    Opis:
    The current curricula of the departments of Chinese in Korea emphasize language and literature, although most students in these departments would prefer an emphasis on curricula in the Chinese social sciences, with less emphasis on language and literature. The research reported here include surveys that identified needs as perceived by students, and contrasted these with studies of existing Korean departments of Chinese. This research indicates that Korean universities currently lack the ability to meet students’ needs. For more effective education, Chinese departments should offer two-track curricula, consisting of a language track and a social science track.
    Źródło:
    The New Educational Review; 2016, 44; 17-29
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on Korean History Education Plans for Children from Mixed Marriages in Korea : Focus on Korean-Vietnamese, -Chinese, and -Japanese Children
    Autorzy:
    Moon, Hyoung-Jin
    Nam, Jong-ho
    Kim, Jong-suck
    Powiązania:
    https://bibliotekanauki.pl/articles/2140592.pdf
    Data publikacji:
    2022-09-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    Children from mixed marriages
    Korean history
    history education
    comparative-history teaching method
    audio-visual teaching method
    Opis:
    This study aims to prepare the most effective Korean history education plan for children from mixed marriages in Korea using a questionnaire survey and in-depth interviews. Before the survey, the children from mixed marriages between Korea and Vietnam, China, and Japan preferred the auto-visual teaching method (ATM). However, after learning Cramming Teaching Method (CTM), Audio-Visual Teaching Method (ATM), Comparative-History Teaching Method (CHTM), and Discussion Teaching Method (DTM) for one week, Chinese and Korean – Japanese children preferred CHTM, whereas Korean-Vietnamese children preferred ATM itself. Hence, CHTM was found to be the most effective method when educating Korean history to the children from mixed marriages between Korea and countries with many historical conflicts, similar to that of their mothers (first-generation immigrants).
    Źródło:
    The New Educational Review; 2022, 69; 39-50
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Measures to Improve Korean Culture Education for Chinese Students in South Korea: Focusing on Racial Differences
    Autorzy:
    Kim, Yongdeog
    Nam, Jong-ho
    Moon, Hyoung-Jin
    Powiązania:
    https://bibliotekanauki.pl/articles/1997568.pdf
    Data publikacji:
    2017-12-31
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    Chinese students
    culture knowledge
    culture teaching methods
    Korean culture
    Opis:
    To derive a more effective educational method, racial differences among Chinese students in learning Korean culture was invesigated using a survey method. The Han and Joseon racial groups in China were examined. Before the survey, the Han race students (Chinese students except Joseon race students, in this case) preferred a language and culture teaching method (LCTM), whereas the Joseon race students favored an audiovisual teaching method (AVTM). However, after experiencing four different teaching methods – comparative-cultural teaching method (CCTM), AVTM, LCTM, and rote memorization teaching method—for two weeks, the Han race students preferred the AVTM more, whereas the Joseon race students preferred the CCTM. Thus, students from the same country require different education methods.
    Źródło:
    The New Educational Review; 2017, 50; 146-158
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Measures for the Improvement of History Education for Chinese Students in South Korea
    Autorzy:
    Hyoung-jin, Moon
    Jong-ho, Nam
    Yong-deog, Kim
    Powiązania:
    https://bibliotekanauki.pl/articles/2031731.pdf
    Data publikacji:
    2014-09-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    Chinese students
    history knowledge
    history teaching methods
    Korean history
    Opis:
    The objective of this research was to find a more effective method for the teaching of history to Chinese students studying in South Korean universities. Questionnaire surveys and interviews were conducted to investigate those students’ level of knowledge and perceptions of Korean history. Then, in history classes, four teaching methods (comparative-historical, audiovisual, history and language, and rote memorization) were applied over two weeks. Before the treatment, Chinese students said that they liked the audiovisual teaching method the most, but after taking the classes, they preferred the teaching method comparing Korean and Chinese histories. Besides the finding that the comparative method was the most popular, the responses also showed that it was the most effective one in teaching history to Chinese students.
    Źródło:
    The New Educational Review; 2014, 37; 54-65
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Aspect Ratio on Iron-Ore Briquettes During Twin-Roll Briquetting
    Autorzy:
    Kim, Kang-Min
    Bae, Jong-Ho
    Han, Jeong-Whan
    Powiązania:
    https://bibliotekanauki.pl/articles/355616.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    numerical analysis
    discrete element method
    roll briquetting
    Opis:
    In the ironmaking, sizes of raw materials such as iron ores and coke must be adjusted for subsequent process in the blast furnace. The depletion of high grade iron ore in recent years necessitates a technology that can utilize low-grade fine iron ores. Thus, steelmakers have been studying the sinter-briquette complex firing process that employs a method of charging the sinter feed together with briquettes made of fine iron ore. In this process, larger briquettes increase the briquette productivity per unit time but decrease the green strength of briquettes and they can break during transportation and charging. Thus, the briquette shape is very important. Therefore, in this study, we simulate a twin roll briquetting process using the DEM analysis and compared the compressive force distributions in the briquette for different aspect ratios. This study is a new attempt, because research cases by numerical methods on the same or similar systems are very rare. Consequently, the optimal aspect ratio is 0.5 at briquette height 20 mm, 2.0 at 30 mm, and 1.5 at 40 mm. Also, the average compressive force increased in proportion with the pocket height at the sameaspect ratio. Therefore, to increase the pocket depth for high productivity, the pocket height must also be increased for obtaining high strength briquettes.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1335-1339
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and performance of dual-band MWIR/LWIR focal plane arrays based on a type-II superlattice nBn structure
    Autorzy:
    Lee, Hyun-Jin
    Eom, Jun Ho
    Jung, Hyun Chul
    Kang, Ko-Ku
    Ryu, Seong Min
    Jang, Ahreum
    Kim, Jong Gi
    Kim, Young Ho
    Jung, Han
    Kim, Sun Ho
    Choi, Jong Hwa
    Powiązania:
    https://bibliotekanauki.pl/articles/2204217.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    InAs/GaSb type-II superlattice
    dualband detector
    dark current
    spectral quantum efficiency
    noise equivalent temperature difference
    Opis:
    Dual-band infrared detector, which acquires more image information than single-band detectors, has excellent detection, recognition, and identification capabilities. The dual-band detector can have two bumps to connect with each absorber layer, but it is difficult to implement small pitch focal plane arrays and its fabrication process is complicated. Therefore, the most effective way for a dual-band detector is to acquire each band by biasselectable with one bump. To aim this, a dual-band MWIR/LWIR detector based on an InAs/GaSb type-II superlattice nBn structure was designed and its performance was evaluated in this work. Since two absorber layers were separated by the barrier layer, each band can be detected by bias-selectable with one bump. The fabricated dual-band device exhibited the dark current and spectral response characteristics of MWIR and LWIR bands under negative and positive bias, respectively. Spectral crosstalk that is a major issue in dualband detectors was also improved. Finally, a 20 µm pitch 640 x 512 dual-band detector was fabricated, and both MWIR and LWIR images exhibited an average noise equivalent temperature difference of 30 mK or less at 80 K.
    Źródło:
    Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144560
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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