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Scientists of the Gwansang-gam, the Royal Observatory of Joseon Dynasty 1
Nha, Il-Seong,Nha, Sarah,Cho, Haman 한국우주과학회 2013 Journal of Astronomy and Space Sciences Vol.30 No.1
We have uncovered 14 Korean royal astronomers and one scientist who worked in the early and mid-18th century. In spite of their high positions in the government office, all of them but one were not recorded anywhere in the major histories, such as WangjoSillok (王朝實錄) and JeungboMunheonBigo (增補文獻備考). Our search of Bon'gwans for each person has been carried successfully for 13 scientists. Their family relations are also uncovered finding five eminent astronomy families.
ATMOSPHERIC ECLIPSING BINARY ZETA AURIGAE IN THE 1987-1988 ECLIPSE (II)
Nha, Il-Seong The Korean Space Science Society 1991 Journal of Astronomy and Space Sciences Vol.8 No.2
UBV observations at Yonsei University Observatory (500 and 537 observations each at Ilsan Station and at Campus Station) were made for the latest eclipse of $\zeta$ Aur in 1987-1988. Orbital period of Saijo and Saito has been confirmed and the light and color variations on the night JD 244730 are found.
UBV LIGHT CURVES OF $\zeta$ AUR STAR 32 CYGNI
Nha, Il-Seong,Kim, Yong-Gi,Lee, Yong-Sam The Korean Space Science Society 1992 Journal of Astronomy and Space Sciences Vol.9 No.2
UBV observations of $\zeta$ Aur star 32 Cyg have been made at the Yonsei University Observatory using the 60-cm Goto relflector for five years, 1988-1992. Observations made during these years cover outside of eclipse phase only. No significant light variation which would represent the secondary eclipse of red supergiant by a hot main sequence star is found. The light levels in three passbands do not show any evidence of the proximate effect of this binary system. Some strong light variations, particularly in U, are discussed with no successful explanation.
English as a Medium of Instruction : Challenges for Vietnamese Tertiary Lecturers
Nha T. T. Vu,Anne Burns 아시아영어교육학회 2014 The Journal of Asia TEFL Vol.11 No.3
The development of English as a medium of instruction (EMI) is of great interest to language and language policy researchers in an era of globalization and internationalization. Despite recognition of a number of implementational problems and constraints, EMI has been widely introduced into various non-native English-speaking (NNES) countries. The question of what challenges face stakeholders in the implementation of EMI was our major focus in a two-year project that investigated a new EMI undergraduate program in Vietnam. Selected findings from the study’s interview component reveal that lecturers were challenged by their own language abilities, students’ language competence and learning styles, pedagogical issues, and resource availability. Based on these findings, suggestions are made for enhancing the success of similar programs.
A Study on the Green Function for the Heisenberg Ferro- and Antiferro-magnets
Nha, Sang-Kyun,Cho, Hwa-Shuk 울산대학교 1975 연구논문집 Vol.6 No.1
Heisenberg의 强磁性 反强磁性에 대한 統一된 Green 函數理論을 수립하였다. Green 函數의 運動方程式을 Callen의 decoupling 近似方法으로 分離시켜서 解를 求하고 이 解를 利用하여 强磁性에 대한 Curie 溫度 및 그 上下에서 spin의 橫的相關函數를 計算하였다. 이 結果가 다른 硏究結果와 一致하였다. The unified Green function theory is developed for the Heisenberg ferro-and antiferro-magnets. The equation of motion for the Green function is decoupled by the Callen decoupling approximation. The Solution of the equation is used to find the transverse corrlation functions of spins at, above, and below the Curie temperature for the ferromagnets. The results are found to be consistent with the others.
A Study on the Electron Momentum Densities in Copper and Copper Alloy
Nha, Sang Kyun 울산대학교 1981 연구논문집 Vol.12 No.2
光子의 Compton profile을 計算하여 Cu 및 Cu?? Ni?? 合金의 電子運動量 密度를 硏究하였다. Hartree-Fock-Slater 電子波動函數를 利用하여 電子運動量函數와 동경密度分布를 計算하고 이들을 利用하여 Compton Profile을 計算하였다. 本 硏究는 Compton Frofile이 各電子軌道의 電子運動量密度에 따라 그 기울기가 變하고 있음을 보여 주었다. 또한 Compton Profile의 웃部分은 電子軌道의 最外각 軌道電子의 運動量密度에 크게 依存되고 있음을 보여 주었다. 따라서 이 Compton Profile의 웃部分이 適當한 分解能의 實驗으로서 測定될 때 化學 및 物理的으로 가장 關心이 많은 物質內 最外각電子의 運動狀態가 硏究될 수 있음을 暗示하여 주고 있다. The electron momentum densities of Cu and Cu?? Ni?? alloy have been studied through the calculation of the Compton profile of photon. The Hartree-Fock-Slater electronic wave functions were used to calculate the electron momentum wave functions, the radial density distributions, and then the Compton profiles. It was shown that the Compton profiles have some rather discontinuous changes in the slopes due to the contributions from momentum densities of the electronic shells. It was also shown that the top of the Compton profiles was mainly governed by the momentum densities of the outermost electrons. It was suggested here that the electron behaviour of the outermost electrons in matter, which is of most physical and chemical interest, can be studied, under proper experimental resolution, by measurement of the line shape of the top of peak of the Compton profile.
A Study of the 1668 Deungrok, Records of Celestial Phenomena from the Joseon Dynasty
Nha, Il-Seong,Hong, Yoon,Ahn, Na-Mi 한국우주과학회 2012 Journal of Astronomy and Space Sciences Vol.29 No.2
This paper will introduce and overview in general the Seongbyeon Deungrok issued by the Gwansang-gam, the Astronomical Board in the Joseon Dynasty of Korea. All the Chinese characters in the 1668 Seongbyeon Deungrok was deciphered at first and these were translated into Korean and English. With these translations and the word ‘white vapor’ in particular we discuss the nature of the main object in this Deungrok. Lastly, names of observers who engaged in the observations of this 1668 celestial, which are made as a by-product of this research, are introduced.
Period Variations of the Selected Eclipsing Variables in Perseus
Nha, Il Seong,Oh, Kyu Dong,Jeong, Jang Hae 연세대학교 대학원 1975 延世論叢 Vol.12 No.2
페르세우스 성좌내의 잘 알려져 있는 식변광성, AG Per와 Algol의 주기 변화에 대하여 연구하였다. AG Per에 대하여 Flower and Cook 천문대에서 관측한 BV 관측은 Semeniuk (1968)에 의하여 주어진 광도요소와 잘 일치하지만 궤도ㅈ기에 있어서는 +0d.00000010의 미소한 보정을 하였다. Popper (1974)가 최근에 얻은 이 별의 질량과 우리의 궤도주기를 가지고도 Semeniuk의 Apsidal constant를 보정할 수는 없었다. Algol에 대하여는 연세대학교 부속천문대의 6-cm 천체 사진의로 한개의 극심시각을 얻었다. 이 값과 Eggen(1948)이 관측한 이후에 알려진 14개의 값들을 여러 문헌에서 수집하여 새로운 광도요소로서 T0=JD 2440953.4552, P=2d8673285을 얻었다.