• Journal of Astronomy and Space Sciences
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• v.9 no.2
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• pp.154-164
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• 1992

The Mg II lines been extracted from the IUE archival spectra of 32 Cygni to investigate the effect of the atmospheric eclipse. The UV light curve has been reduced from the continuum flux at the center wavelength of 2807.5 ${\AA}$ in the IUE spectra. The equivalent width of the Mg II k absoption line has been measured for each spectra. The results of the light variation and flux tracing of the absorption line at the vicinity of the primary eclipse confirmed the atmospheric eclipse. The atmospheric effect lasted until the phase 0.06 in the absorptin line tracing, while it lasted until the phase 0.02 in the UV light curve, respectively.

• Journal of Astronomy and Space Sciences
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• v.7 no.1
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• pp.57-69
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• 1990

The eighteen ultraviolet light curves of Epsilon Aurigae have been plotted using the integrated fluxes reduced from the 233 IUE low dispersion spectra taken between 1978 and 1986. The times of contacts and depth of eclipse have been determined from the light curves at the wavelength from 2550 $AA$ to 3050 $AA$. The UV light curves show two brightenings during the totality, the downward slope of the variation from the second to the third contacts, and asymmetry of the eclipse light curve. The two selected spectra note that the energy density distribution is not changed between the totality of the eclipse and out-of-eclipse.

• The Bulletin of The Korean Astronomical Society
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• v.41 no.1
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• pp.63.1-63.1
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• 2016

일성정시의는 표준시보장치인 보루각루의 시각을 교정하는 천문시계로 알려져 있다. "세종실록"에 기록된 김돈(金墩,1385~1440)의 일성정시의(日星定時儀)의 서(序)와 명(銘)에는 기기의 상세한 구조와 치수, 그리고 사용법을 소개하고 있다. 우리는 실록의 기록을 분석하여 세 종류의 일성정시의로 구분하였다. 또한 Needham et al. (1986)의 연구와 비교하여 일구백각환, 성구백각환, 주천도분환, 계형 등의 사용법을 분석하였다. 우리는 이러한 분석을 통해 해시계와 별시계로써의 일성정시의의 시간 측정 정밀도를 제시하였다.

• Bulletin of the Korean Space Science Society
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• 2009.04a
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• pp.44.2-45
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• 2009

• Bulletin of the Korean Space Science Society
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• 2009.04a
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• pp.43.2-43.2
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• 2009

• Korean Journal of Heritage: History & Science
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• v.55 no.1
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• pp.223-242
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• 2022

The main purpose of this study is to find out the meaning of structural changes that appeared in the royal tombs of the Joseon Dynasty after the application of a compound lime-mortar(Sammulhoe三物灰: the mortar with lime, sand, ocher). In the early Joseon Dynasty, the royal tomb was constructed by following the system of the stone chamber tomb in the Goryeo Dynasty. However the system of the stone chamber tomb recorded in 『GukJo-OReYi(國朝五禮儀: The five category's formalities in the Joseon Dynasty)』 is very different from that in the Goryeo Dynasty. The biggest difference is that a compound lime-mortar was applied into the system of the stone chamber tomb in order to attempt structural reinforcement. This change reflects King Sejong's willingness to build a dense structure in which water does not permeate the stone chamber when Yeongneung(英陵) was built in 1446(the 28th year of King Sejong's reign). Yeongneung is a complex structure consisting of a stone chamber and compound lime-mortar wall. After constructing a stone chamber, the 1.2m(4尺) thick wall with a compound lime-mortar is additionally constructed outside the stone chamber structure. In 1468(the year of King Yejong's accession), according to the will of King Sejo, the stone chamber system was abolished and the Hyeongung(玄宮: the chamber enshrining a coffin of the deceased king or queen consort) was constructed only by the thick wall with a compound lime-mortar. This change become a primary cause for the royal tomb to be constructed as Hoekyukneung(灰隔陵: the royal tomb with chamber constructed only by the thick wall with compound lime-mortar) in the late Joseon Dynasty. The Hoekyukneung in the late Joseon Dynasty has been constructed with the method of structure and construction for the thick wall with a compound lime-mortar since the complex structure recorded in 『GukJo-OReYi(國朝五禮儀)』. The Hoekuykseoksilneung(灰隔石室陵: the complex structure consisting of a stone chamber and compound lime-mortar wall) is unique tomb style of Joseon Dynasty and become a motive of tomb system(Hoekuykneung) in the late Joseon Dynasty.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.2 no.1
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• pp.236-265
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• 1974

The study is to trace the origin of the Hongmunkwan ana discuss its development and roles assigned in each succeeding stages of the history. The Hongmunkwan lived a long life through Koryo and Yi dynasties. It was a multi-functioned institution designed as a royal library, an educational institution, and a political reference center. Prior to the Hongmunkwan, there were some established institution with similar functions to its ones during the Three-Kingdom Era. One of such kind was the Sungmunkwan(崇文館), which was eventually renamed the Hongmunkwan by King Songjong(成宗) of Koryo in 995, and a distinguished scholar-minister was appointed at the position of directorship for management of the now status-raised institution where state documents and books were housed. The Hongmunkwan experienced some reforms during its long life. In 1420, King Sejong(世宗) of Yi Dynasty founded the Jipyonjon(集賢殿) within the royal palace in place of the Hongmunkwan. The Jipyonjon was an innovated Hongmunkwan where many scriptures were stored and distinguished scholars and officials studied on them, sometimes delivering lectures to the king. King Sejo(世祖) abolished the Jipyonjon in his second year(1456) and reestablished the Hongmunkwan designed as a royal library in place of the former in his ninth year. King Songjong(成宗) in his 10th year (1479) of the reign, reformed the Yemunkwan(藝文館), which existed from the beginning of the Yi dynasty, by extending its functions and afterwards absorbed it into the Hongmunkwan together with the functions of the former Jibhyonjon which were included in the Yemunkwan. He founded another Yemunkwan which had the roles of drafings and descriptions of royal decrees. In the 10th year (1504) of Yonsankun(燕山君), the Hongmunkwan was abolished and instead of it the Jindokchong(進讀廳) was founded with less authority and functions. But shortly after that, King Jungjong(中宗) refounded the Hongmunkwan with the same scale, same authority and same functions as the former, one. As the Hongmunkwan also had a function of the royal library it collected and kept numerous books and writings in it. Some books and writings of the Hongmunkwan were composed of those which had been transmitted from the Koryo Dynasty and the others were composed of those which had been collected in the country or purchased by the trade with China in the Yi dynasty. Also newly-compiled important books in the country were reprinted and one of them were send to the Hongmunkwan. In the 8th year (1784) of King Jongjo(正祖), the history of the Hongmunkwan, entitled the Hongmunkwanji(弘文館志), was written and editioned by the royal decree and it was reeditioned the 7th year (1870) of King Kojong(高宗). The Hongmunkwan was absorbed into the Kyujanggak(奎章閣) in 1907.

• Journal of the Korean Society of Earth Science Education
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• v.5 no.2
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• pp.139-147
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• 2012

The purpose of this study was to explain how extraordinary the scientific technology or our ancestor was from the modern perspective by remodeling the most unique astronomical instrument, So-ganui (小簡儀), developed in the Sejong Period (世宗時代) after being examined with contemporary and the principles of the science and observational technology would be properly understood and measured directly. When measuring the altitude of the sun and azimuth using So-ganui, it was adjusted with the horizontal coordinate system and measured using Jipyeonghwan (地平環), Ipeunhwan (立運環) and Guyhyeong (窺衡). Based such measuring principles, the measurement accuracy proposed using So-ganui are as follows. The remodeled So-ganui produced approximately ${\pm}0.29$ degrees error on average at high altitude while in measuring the azimuth degrees, there was difference of ${\pm}0.35$ degrees. Since the theoretically, the measurement error for So-ganui was ${\pm}0.5$ degrees, the remodeled So-ganui could accurately measure at the high altitude compared to So-ganui from the Sejong period. In the study, So-ganui, which has disappeared, has been remodeled in modern perspective to be used as the educational material to accurately understand the principles of science and measurement technology from the Sejong period. The findings could contribute to raising the reputation in the astronomical observations from the documents from the Sejong period. Furthermore, this study has materialized the celestial and sky our ancestors have viewed with the observational principles of their times, on the computer screen via a webcam, bringing out interest in the traditional science for the students.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.30 no.3
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• pp.12-20
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• 2012

This study was carried out to investigate the backgrounds and spatial characteristics of the sericulture in the rear garden of the palace in Joseon Dynasty. Joseon Dynasty made the various efforts not only to enhance the promotion of agriculture but also sericulture since the main industry of Joseon Dynasty was farming. At the very beginning, Joseon Dynasty planted mulberry trees and built a silkworm-raising room(蠶室) around the Donggung(東宮). Then, King Sungjong(成宗) made Chaesangdan(採桑壇) in Changgyeong Palace and performed Chinzamryae(親蠶禮). The location of Chaesangdan varied as time goes on until the king Gwanghaegun(光海君). Lastly, King Yeongjo(英祖) made Chaesangdan and Junghaechinzambi(丁亥親蠶碑) in Gyeongbok Palace. Yeongjo(英祖) showed a strong attachment to Gyeongbok Palace and actively encouraged the sericulture. Chaesangdan was built in the east side of the palace which was appropriate for planting mulberry trees. Furthermore, a silkworm-raising room was located in this place at the era of King Sejong(世宗).

• Journal of the Korean Society of Food Culture
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• v.38 no.1
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• pp.26-37
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• 2023

This study applied the text frequency method to analyze the crops prevalent during the Chosunwangjoshilrok dynasty, and categorized the results by each king. Contemporary perception of grains was observed by examining the staple crop types. Staple species were examined using the word cloud and semantic network analysis. Totally, 101,842 types of crop consumption were recorded during the Chosunwangjoshilrok period. Of these, 51,337 (50.4%) were grains, 50,407 (49.5%) were beans, and 98 (0.1%) were seeds. Rice was the most frequently consumed grain (37.1%), followed by pii (11.9%), millet (11.3%), barley (4.5%), proso (0.8%), wheat (0.6%), buckwheat (0.1%), and adlay (0.05%). Grain chronological frequency in the Choseon dynasty was determined to be 15,520 cases in the 15^th century (30.2%), 11,201 cases in the 18^th century (21.8%), 9,421 cases in the 17^th century (18.4%), 9,113 cases in the 16^th century (17.8%), and 6,082 cases in the 19^th century (11.8%). Interest in grain amongst the 27 kings of Choseon was evaluated based on the frequency of records. The 15^th century King Sejong recorded the maximum interest with 13,363 cases (13.1%), followed by King Jungjo (8,501 cases in the 18^th century; 8.4%), King Sungjong (7,776 cases in the 15^th century; 7.6%).