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Wyświetlanie 1-15 z 28
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:
Construction of the real dihedral number fields of degree 2p. Applications
Autorzy:
Louboutin, Stéphane
Park, Young-Ho
Lefeuvre, Yann
Powiązania:
https://bibliotekanauki.pl/articles/1390504.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
dihedral field
dihedral group
CM-field
Źródło:
Acta Arithmetica; 1999, 89, 3; 201-215
0065-1036
Pojawia się w:
Acta Arithmetica
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:
Principal Instructional Leadership and Teaching for Learner Autonomy: A Multilevel Analysis of the Case of South Korea
Autorzy:
Ham, Seung-Hwan
Ahn, Sung-Ho G.
Cha, Yun-Kyung
Ju, Mi-Kyung
Kim, Sunah
Ku, Hara
Lee, Sun-Kyung
Park, Young Serk
Powiązania:
https://bibliotekanauki.pl/articles/18104543.pdf
Data publikacji:
2013-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Opis:
This study aims to explore how teachers’ use of instructional strategies to foster learner autonomy varies depending on principal instructional leadership. Based on a nationally representative sample of approximately 2,200 teachers in 131 middle schools in South Korea, a series of hierarchical generalized linear modeling analyses has been conducted. The main findings from this study lend credence to the idea that teachers whose school principals provide greater instructional leadership are significantly more likely to integrate instructional strategies to advance learner autonomy into their classroom teaching. This result appears very robust even after a range of variables pertaining to school and teacher characteristics is simultaneously taken into account.
Źródło:
The New Educational Review; 2013, 33; 247-260
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economic Analysis of Charitable Donations
Autorzy:
Young Kang, Moon
Park, Byungho
Lee, Sanghak
Kim, Jaehwan
Allenby, Greg
Powiązania:
https://bibliotekanauki.pl/articles/540580.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
direct utility model
hierarchical Bayes
altruism
non-profit marketing
Opis:
This paper examines the effect of message characteristics on donation behavior using an economic model of giving. The utility of giving can come from one’s own contribution and possibly from the combined contributions of others. Donors are assumed to be constrained utility maximizers, and the message attributes affect the degree to which they react altruistically or egoistically. The model is estimated with data from an incentive-aligned study of South Korean consumers, and implications for message optimization and donor targeting are explored.
Źródło:
Journal of Marketing and Consumer Behaviour in Emerging Markets; 2016, 2(4); 40-57
2449-6634
Pojawia się w:
Journal of Marketing and Consumer Behaviour in Emerging Markets
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Incidentally diagnosed epithelioid trophoblastic tumor immediately after delivery: a case report
Przypadkowe rozpoznanie nowotworu nabłonkowatokomórkowego trofoblastu bezpośrednio po porodzie – opis przypadku
Autorzy:
Kwon, Hyun Young
Park, Jung-Woo
Powiązania:
https://bibliotekanauki.pl/articles/1030115.pdf
Data publikacji:
2016
Wydawca:
Medical Communications
Tematy:
epithelioid trophoblastic tumor
gestational trophoblastic disease
rare tumor
uterine neoplasm
Opis:
Epithelioid trophoblastic tumor is a rare malignant lesion of gestational trophoblastic disease, and constitutes an abnormal proliferation of placental trophoblasts. Patients with epithelioid trophoblastic tumor are usually of reproductive age, and have had previous gestations including full-term deliveries, molar pregnancies and abortions. The interval between antecedent gestational events and the diagnosis of epithelioid trophoblastic tumor usually ranges from 0 to 264 months (mean, 84 months). Herein, we report a 42-year-old Korean woman (gravida 2, para 2). At 38 weeks of gestation, she underwent a repeat cesarean section and then hysterectomy due to uterine atony. She was incidentally diagnosed with epithelioid trophoblastic tumor, and postoperatively no metastatic disease was observed. The patient presented no clinical evidence of tumor recurrence for 5 years after surgery. This case is remarkable because epithelioid trophoblastic tumor is a rare disease, and the diagnosis of epithelioid trophoblastic tumor followed immediately after delivery.
Nowotwór nabłonkowatokomórkowy trofoblastu (epithelioid trophoblastic tumor) to rzadka złośliwa postać ciążowej choroby trofoblastycznej. Charakteryzuje się nieprawidłowym rozrostem komórek trofoblastu. Zmiany tego typu rozpoznaje się u kobiet w wieku rozrodczym z ciążą w wywiadzie, zarówno donoszoną, jak i przedwcześnie zakończoną, również z zaśniadem groniastym. Czas między ciążą a rozpoznaniem nowotworu nabłonkowatokomórkowego trofoblastu wynosi od 0 do 264 miesięcy (średnio 84 miesiące). Przedstawiamy przypadek 42-letniej pacjentki z Korei (gravida 2, para 2), u której w 38. tygodniu ciąży wykonano cięcie cesarskie, a następnie histerektomię ze względu na atonię macicy. Przypadkowo rozpoznano nowotwór nabłonkowatokomórkowy trofoblastu, a po zabiegu nie zaobserwowano przerzutów. Pacjentka nie wykazywała cech nawrotu przez 5 lat po zabiegu. Prezentowany przypadek jest szczególny, ponieważ nowotwór nabłonkowatokomórkowy trofoblastu to rzadkość, a rozpoznano go bezpośrednio po porodzie.
Źródło:
Current Gynecologic Oncology; 2016, 14, 3; 174-177
2451-0750
Pojawia się w:
Current Gynecologic Oncology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In postmenopausal women, some uterine leiomyosarcomas mimic a cystic degeneration of uterine myoma: two case reports and a literature review
U kobiet w okresie pomenopauzalnym mięsak gładkokomórkowy macicy może imitować zwyrodnienie torbielowate mięśniaka macicy – opis dwóch przypadków i przegląd literatury
Autorzy:
Young Kwon, Hyun
Rha, Seo-Hee
Park, Jung-Woo
Powiązania:
https://bibliotekanauki.pl/articles/1029733.pdf
Data publikacji:
2017
Wydawca:
Medical Communications
Tematy:
degenerating cystic uterine leiomyoma
uterine leiomyosarcoma
uterine malignancies
Opis:
Uterine leiomyosarcoma is an uncommon malignancy accounting for approximately 1% of gynecologic oncology cases. Most uterine leiomyosarcomas occur in menopausal women and they are notorious for their aggressive character, early dissemination, and poor prognosis. It is difficult to accurately differentiate uterine leiomyosarcoma from leiomyomas, especially when leiomyomas undergo degenerative changes. We treated two menopausal women with a uterine mass showing cystic change. Clinical work-up included needle aspiration, sonography, computed tomography, and serum tumor markers to differentiate uterine leiomyosarcoma from leiomyoma. All results were negative for malignancy, but uterine leiomyosarcoma was ultimately diagnosed by pathological examination. Until an accurate preoperative diagnostic method is available, menopausal women diagnosed with a degenerating cystic uterine fibroid should be considered to have a malignancy intraoperatively in order to prevent tumor cells from intraperitoneal spreading.
Mięsak gładkokomórkowy macicy to rzadki nowotwór złośliwy odpowiadający za około 1% przypadków nowotworów narządów rodnych. Nowotwór ten występuje głównie u kobiet w okresie pomenopauzalnym i jest znany z agresywnego przebiegu, wczesnego rozsiewu oraz złego rokowania. Przeprowadzenie dokładnej diagnostyki różnicującej mięsaka gładkokomórkowego i mięśniaków jest trudne, zwłaszcza w przypadku zmian degeneracyjnych tych drugich. W pracy przedstawiono przypadki dwóch kobiet w okresie pomenopauzalnym, u których w macicy stwierdzono obecność masy wykazującej zmianę torbielowatą. W ramach diagnostyki klinicznej wykonano biopsję aspiracyjną, badanie ultrasonograficzne, tomografię komputerową oraz oznaczono stężenia markerów nowotworowych w surowicy krwi w celu zróżnicowania mięsaka gładkokomórkowego i mięśniaka. Chociaż wszystkie badania dały wynik ujemny dla nowotworu złośliwego, badanie histopatologiczne potwierdziło rozpoznanie mięsaka gładkokomórkowego macicy. Dopóki nie będzie dostępna dokładna metoda diagnozowania przedoperacyjnego, w przypadku kobiet w okresie pomenopauzalnym z rozpoznaniem zwyrodnienia torbielowatego mięśniaka macicy należy śródoperacyjne założyć obecność nowotworu złośliwego w celu uniknięcia dootrzewnowego rozsiewu komórek nowotworowych.
Źródło:
Current Gynecologic Oncology; 2017, 15, 2; 142-145
2451-0750
Pojawia się w:
Current Gynecologic Oncology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Study on the Electrical and Mechanical Characteristics of Ni-30wt%Co and Cu-2wt%Be Alloy for Development of Semiconductor Test Probe Pin
Autorzy:
Park, Jin-Young
Kim, Young-Choon
Kim, Jae-Gyun
Powiązania:
https://bibliotekanauki.pl/articles/353264.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
probe pin
Be-Cu Alloy
Ni-Co Alloy
test socket
mechanical properties
electrical properties
Opis:
Ultra-precision testing is a very important procedure to secure the reliability of the products as well as for the technology development in the areas of semiconductor and display. Accordingly, companies manufacturing equipment for testing of semiconductor and display have been continuously executing researches for the improvement of the performances of test sockets used in test equipment. Through this study, characteristics of the materials in accordance with the mechanical and electrical properties of Ni-30wt%Co alloy and newly developed Cu-2wt%Be alloy were analyzed in order to select the probe pin material of the socket, which is a key component used in the semiconductor testing equipment. In addition, finite element interpretation was executed by using Ansys Workbench 14.0 to comparatively analyze the finite element interpretation results and experimental results. Experiment was executed for the mechanical properties including tensile strength, elasticity modulus, specific heat, thermal expansion coefficient and Contact Force, for electrical properties, experiment on surface resistance, specific resistance and electrical conductivity was executed to measure the properties. It was confirmed that the results of finite element interpretation and experiment displayed similar trend and it is deemed that the Contact Force value was superior for Be-Co alloy. Through this study, it was confirmed that the newly developed Be-Co alloy is more appropriate as probe pin material used as the core component of test socket used in the semiconductor testing equipment than the existing Ni-Co alloy.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 943-947
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Process Variables on Friction Stirred Microstructure and Surface Hardness of AZ31 Magnesium Alloy
Autorzy:
Kim, Jae-Yeon
Hwang, Jung-Woo
Lee, Seung-Mi
Hyun, Chang-Young
Park, Ik-Keun
Byeon, Jai-Won
Powiązania:
https://bibliotekanauki.pl/articles/355106.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
friction stir process
AZ31 alloy
diamond particle
process variable
grain size
Opis:
Effects of various friction stir processing (FSP) variables on the microstructural evolution and microhardness of the AZ31 magnesium alloy were investigated. The processing variables include rotational and travelling speed of the tool, kind of secondphase (i.e., diamond, Al2 O3 , and ZrO2 ) and groove depth (i.e., volume fraction of second phase). Grain size, distribution of second phase particle, grain texture, and microhardness were analyzed as a function of the FSP process variables. The FSPed AZ31 com-posites fabricated with a high heat input condition showed the better dispersion of particle without macro defect. For all composite specimens, the grain size decreased and the microhardness increased regardless of the grooved depth compared with that of the FSPed AZ31 without strengthening particle, respectively. For the AZ31/diamond composite having a grain size of about 1 μm, microhardness (i.e., about 108 Hv) was about two times higher than that of the matrix alloy (i.e., about 52 Hv). The effect of second phase particle on retardation of grain growth and resulting hardness increase was discussed.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 907-911
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Milling Duration on the Thermoelectric Properties of n-Type Bi2Te2.7Se0.3
Autorzy:
Park, Min-Soo
Koo, Hye-Young
Park, Yonh-Ho
Ha, Gook-Hyun
Powiązania:
https://bibliotekanauki.pl/articles/354698.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermoelectric
bismuth telluride
powder
milling
Opis:
In this study, an oxide reduction process and a reduction-sintering process were employed to synthesize a thermoelectric alloy from three thermoelectric composite oxide powders, and the thermoelectric properties were investigated as a function of the milling duration. Fine grain sizes were analyzed by via X-ray diffraction and scanning electron microscopy, to investigate the influence of the milling duration on the synthesized samples. It was found that microstructural changes, the Seebeck coefficient, and the electrical resistivity of the compounds were highly dependent on the sample milling duration. Additionally, the carrier concentration considerably increased in the samples milled for 6 h; this was attributed to the formation of antisite defects introduced by the accumulated thermal energy. Moreover, the highest value of ZT (=1.05) was achieved at 373K by the 6-h milled samples. The temperature at which the ZT value maximized varied according to the milling duration, which implies that the milling duration of the three thermoelectric composite oxide powders should be carefully optimized for their effective application.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 591-595
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FERMENTED ORIENTAL MEDICINAL INSECT EXTRACT HAS A SYNERGISTIC EFFECT ON INHIBITING TGF-ß1- OR H2O2-INDUCED HEPATIC FIBROGENESIS IN LX-2 AND HEPG2 CELLS
Autorzy:
Choo, Young-Moo
Choi, Young-Ji
Park, In-Sun
Son, Yu-Kyog
You, Kang-Yeol
Kim, Jiyoung
Powiązania:
https://bibliotekanauki.pl/articles/895380.pdf
Data publikacji:
2019-06-28
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 3; 599-603
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of the impact of extensive and intensive reading approaches on the reading attitudes of secondary EFL learners
Autorzy:
Park, A Young
Powiązania:
https://bibliotekanauki.pl/articles/780769.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
extensive reading
intensive reading
reading attitudes
EFL learners
proficiency levels
Opis:
Extensive reading (ER) which encourages second or foreign (L2) learners to engage in a great deal of reading, has long been recognized as an efficient approach in L2 reading pedagogy. While many attempts have been made to understand the effect of ER on the cognitive domains of L2 learners, there has been insufficient investigation into how ER influences their affective domains. Particularly, reading attitudes, one of the key elements of affective factors involved in L2 reading, have received little attention. This classroom-based intervention study investigated the impact of ER on English as a foreign language (EFL) learners’ attitudes toward English reading compared to the influence of the traditional intensive reading (IR) approach. In addition, this study explored whether the impact of the ER approach on EFL learners’ reading attitudes is different depending on L2 proficiency. The study included two intact classes of EFL secondary learners (N = 72) who received either ER or IR instructional treatments for a 12-week period. For the results, ANCOVA showed that the ER approach fostered positive reading attitudes significantly more than the IR approach. In addition, the analysis indicated that the participants’ proficiency levels did not have a significant effect upon changes in their reading attitudes. That is, regardless of proficiency level, the ER approach demonstrated a significantly positive effect on participants’ reading attitudes in comparison with the IR approach.
Źródło:
Studies in Second Language Learning and Teaching; 2020, 10, 2; 337-358
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of a new respiratory syndrome associated with the use of a humidifier disinfectant: humidifier disinfectant-related respiratory syndrome (HDRS)
Autorzy:
Leem, Jong Han
Joh, Joon-Sung
Hong, Young-Seoub
Kim, Jungwon
Park, Soyoung
Lim, Soyeoun
Kim, Yangho
Powiązania:
https://bibliotekanauki.pl/articles/2116504.pdf
Data publikacji:
2020-10-20
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
pneumonitis
respiratory
lung
disinfection
injuries
humidifier
Opis:
ObjectivesThe purpose of this study was to characterize a new respiratory syndrome associated with exposure to a humidifier disinfectant (HD) in South Korea that is distinct from the well-known HD-related lung injury (HDLI). The authors identified this condition in 24 study subjects who were family members of patients with definite or probable HDLI (referred to as index cases), and were exposed to HD in the same room as the index cases.Material and MethodsThe authors reviewed medical records of 236 family members in 110 families who were exposed to HD in the same rooms and residences as the index cases.ResultsThey identified 24 family members who were exposed to HD in the same rooms and residences as the index cases, and who developed respiratory disorders that were distinct from HDLI. The clinical signs and symptoms of these individuals were in the upper respiratory tract, such as allergic rhinitis and croup, or in the lower respiratory tract, such as bronchitis and pneumonia. The diffusing capacity of the lung fordetermicarbon monoxide was reduced in 9 of 12 children (data not available for 1 child), and in 4 of 5 adults (data not available for 6 adults). The percent forced vital capacity and forced expiratory volume in one second/forced vital capacity ratios were within the normal ranges in most patients. The computed tomography findings, which mostly indicated non-specific inflammation, were inconsistent with the radiological diagnostic criteria for HDLI, but were abnormal in 8 of 11 adults, and in 2 of 13 children.ConclusionsThe authors propose a new condition, i.e., HD-related respiratory syndrome (HDRS), which is characterized by mild to moderate or atypical respiratory symptoms and signs, and is related to HD exposure, but is distinct from HDLI. The recognition of HDRS may provide a basis for understanding the natural history of HD-related respiratory problems, and for capturing the whole spectrum of HD-related clinical manifestations in the respiratory tract.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2020, 33, 6; 829-839
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
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