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비정질 Fe - Co - RE - B (RE=Nd, Sm, Gd, Tb) 합금의 자기적 성질
김경섭(K. S. Kim),유성초(S. C. Yu),김창식(C. S. Kim),김종오(J. O. Kim) 한국자기학회 1991 韓國磁氣學會誌 Vol.1 No.2
The temperature-dependent magnetization curves of amorphous Fe-Co-(Nd, Sm, Gd, Tb)-B alloys were measured using a vibrating sample magnetometer from 77 K up to 900 K. The spin wave stiffness constants and the range of the exchange interaction were calculated from the saturation magnetization values at 0 K, Curie temperatures and the Bloch coefficients estimated from the saturation magnetization curves. The low temperature dependence of magnetization is in good agreement with Bloch relation, Ms(T)=Ms(O) (1-BT^(3/2)-CT^(5/2)). The spin wave stiffness constant and the range of exchange interaction are decreased by substitution of heavy rare earth (Tb, Gd).
비정질합금 Fe80-xCoxB20 자화값의 T³/² 온도 의존성
유병두(B. D. You),김종오(C. O. Kim),김경섭(K. S. Kim),유성초(S. C. Yu) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.3
The temperature-dependent saturation magnetization curves of amorphous Fe_(80-x)Co_xB_(20) (8 ≤ x ≤ 40, the step of x is 8) alloys were measured using a vibrating sample magnetometer from 77 K up to 1000 K. Curie temperature and the Bloch coefficient were estimated from the saturation magnetization curves. The low temperature dependence of magnetization is in good agreement with Bloch relation, Ms(T)=Ms(0) (1-BT^(3/2)- ….). The spin wave stiffness constant, the range of the exchange interaction, and the probable atomic spin were calculated from the saturation magnetization values.
국립중앙도서관 소장 〈왕회도(王會圖)〉 병풍의 제작 시기 추정 - 정전(正殿) ~ 상월대를 향한 계단 위 인물들의 복식과 의물 도상 분석을 중심으로-
이민정(Lee Min-Jung),이경미(Lee Kyung-Mee) 한복문화학회 2021 韓服文化 Vol.24 No.1
Wanghoedo (Envoys Paying Tribute to the Court) is an illustration of envoys from various countries paying tribute to an emperor originated from an anecdotes of legendary Chinese emperors receiving foreign envoys. It is known to have first painted at the request of An Sa-Go under the auspices of Emperor Taejong of Tang. In China, Wanghoedo was continuously painted from Ming to Qing Dynasty. In Joseon, Wanghoedo was established as one of subjects for the royal folding screens during the era of King Jeongjo and Sunjo and had developed into various forms. Yet, the exact time of the production of the remaining individual screens has not been determined. The purpose of this paper is to estimate the timing of the production of Wanghoedo titled "Jinasashin Joseonguk Ahyun Hoedobyung" housed in the National Library of Korea (NLK Wanghoedo), which was estimated to have been produced during the Korean Empire but has not been proven clearly, by analyzing the costumes worn on the figures in the painting. To this end, it was compared and analyzed with other Wanghoedo screens that remain and paintings with significant link. In NLK Wanghoedo, unlike other Korean Wanghoedo, envoys from Wolsang family tributing a white pheasant was depicted as a Qing envoy, Western envoys arrived right in front of the emperor"s podium, a number of royal guards was increased in double, and ritual objects were exalted to the imperial level. The costumes worn on the figures reflected the rapidly changing diplomatic conditions during the Korean Empire. In addition, the presence of the red green-plum blossoms on the back of a pine tree and a bizarre rock, use of cobalt pigment, and reduced body proportions of the figures helped to assume the artifact dates from the time of the Korean Empire.
이상현(S. H. Lee),김경섭(K. S. Kim),주용규(Y. K. Ju),김종호(J. H. Kim) 한국소성가공학회 2015 금형가공 심포지엄 Vol.2015 No.8
Restriking is a kind of sizing process which is an additional operation for increasing the accuracy of the shape or dimension of a cup formed from the previous step. In this paper, Restriking is limited to make a corner sharp of a cup in the last step. A new stepped punch is designed for this experiment. Experiments were carried out to investigate which condition prevented the occurrence of concave defect on the bottom of cylindrical cups as well as which condition gave the minimum corner radius of a cylindrical cup in the restriking process.