Korea has numerous astronomical resources, such as observational records, star maps, and a wealth of literature, covering the period from the Three Kingdoms (54 BC - 932 AD) to the Joseon Dynasty (1392 - 1910 AD). The research activities related to these resources have been limited to those by individual researchers. It is now necessary to conduct research by efficiently and systematically collecting and managing Korean astronomical records using an accessible Web environment. The purpose of this study is to complete a system that enables researchers systematically to collect and verify a large number of historical records related to astronomical phenomena in a Web environment. In 2017, a preliminary survey was conducted, and the requirements pertaining to an implementation target system were devised. In addition, a joint development plan was carried out by the developer, lasting three months in 2018. Although the system is relatively simple, it is the first system to be attempted in the historical astronomy field. In order to proceed with the systematic development, the software development methodology is applied to the entire process from deriving the requirements of researchers to completing the system. The completed system is verified through integrated function and performance tests. The functional test is repeated while modifying and testing the system based on various test scenarios. The performance test uses a performance measurement test tool that takes measurements by setting up a virtual operation environment. The developed system is now in normal operation after a one-year trial period. Researchers who become authorized to use the system can use it to verify the accuracy of data and to suggest improvements. The collected feedback will be reflected in future systems, and Korean astronomical records will be available for use internationally through a multilingual service.

We investigate the provenance and the changes in the timekeeping system focusing on official records such as almanacs and textbooks published by the government after the solar calendar was introduced. We found that the solar calendar and the 12-hour clock time first appeared in 1884 during Joseon dynasty, at that time the solar calendar was used at the open port in Busan to facilitate the exchanges with Japan. The 12-hour clock time first appeared in the『Hansung Sunbo』published by the government in 1884. We also found that the Joseon dynasty also used 12 diǎnzhōng or 12 diǎn. In addition, the term of the ‘Sigan’ first appeared in the first official academic textbook in August 1895, and the chapter related to time contained the information about 12-hour clock time instead of the 12 Shi. In 1908, the meaning of the solar time, the equation of time, and the differences in longitude with the adoption of Korean Standard Time were introduced. Meanwhile, the 24-hour clock time was first introduced in Joseon and applied to railway times in 1907. The 1946 almanac, the first issue after liberation, used the 12-hour clock time which uses ‘Sango’, ‘Hao’ and the 24-hour clock time started to be used from the following year and is still used to this day. Finally, the 12-hour clock time, which was introduced around 1884, was enacted as Article 44 of the law in 1900 and was revised again in 1905 and 1908. In Korea, the terms related to the time in the current astronomical calendar system were newly defined around 1884, 1896, and 1908, and gradually standardized through the establishment of laws.

We compared and analyzed the astronomy terms currently used by astronomers in the two Koreas to promote inter-Korean astronomy cooperation. We analyzed a total of 2716 pairs of terms common in both Koreas glossaries, using the astronomical terminology contained in the South Korean source, the ‘Terminology of Astronomy’, and the North Korean source, ‘Mirror 2.0’. For each pair of terms, their morphological features and meanings were compared. We categorized into 11 groups for comparison of astronomical terms. We found that most of the terms are used similarly in the two Koreas. About 47% of the total is similar in form. Although terms are different, meanings communicate about 37% of the total. As a result, similar terms used by the two Koreas correspond to about 85% of the total. However, 15% of terms are difficult to understand because they have different forms or meanings such as diffraction (회 절/에돌이), flare (플레어/요반) etc. Further research on terms that are used differently by the two Koreas, and the conversion of appropriate terms through mutual understanding should be made in the future.

Deutzia paniculata Nakai(Hydrangeaceae) is a Korean endemic species with very restricted distribution in Gyeongsang-do, Korea. The plants with limited range of distribution are highly affected by various natural and artificial environmental disturbances resulting habitat loss and decline in population. The purpose of this study was to investigate the growth characteristics of D. paniculata based on the degree of germination in different soil types and shading under green house condition in Korea National Arboretum in the preparation to conserve from future extinction. Altogether seven soil types: native(control), forest soil, bed soil, peat moss, peat moss + perlite(2:1), peat moss + perlite + vermiculite(2:1:1), peat moss + perlite(3:1) with three replica each were used for the experiment. In each soil types the germination rate, survival rate, growth amount, leaf area, LMA(Leaf Mass per Area), SPAD value, and the amount of chlorophyll with the shading conditions(non-shading, 25% shading, and 50% shading) were measured. The result indicated that the highest germination(88%) was found in the bed soil. The survival rate was more than 90% in the non-shading and 25% shading conditions; however, it lowered to 10% in the 50% shading condition. The observation of plant height, leaf number, leaf length and width of seedling in bed soil showed the highest growth was in non-shading treatment, and the lowest growth was in soil 50% shading treatment. The chlorophyll content of each treatment in bed soil with non-shading treatment was 1.64(a=0.77, b=0.87) whereas it was 1.54(a=0.69, b=0.84) in 25% shading treatment. The average LMA for each treatment was 0.45(mg/cm2). We found the strong negative correlation between the shading levels and the number of leaves, leaf width, leaf length, leaf area, plant height and SPAD. Overall result indicated that D. paniculata greatly favored bed soil and non-shading condition in the greenhouse. Through this study we have established a series of processes regarding the appropriate degree of soil and shading conditions for growth and germination of D. paniculata. Thus, these processes can be applied in various research fields for preservation and proliferation of the species.

We study the manufacturers of the astronomical instruments invented as part of the so-called Ganui-Dae (astronomical platform) project in the reign of King Sejong (1418-1450) of the Joseon dynasty. The main purpose of this project was to compile the Chiljeongsan-Naepyeon, a Korean calendar, that lasted for 5.5 years from 1432 to 1438. Through this project, a total of 17 astronomical instruments such as the armillary sphere, celestial globe, and auto-striking clepsydra were developed. It is generally known that most of them were manufactured by Lee Cheon (李蕆, 1376-1451) and Jang Yeong-Sil (蔣英實, fl. 1423-1442). In this study, we investigate the accounts of the Veritable Records of King Sejong, Munjong, and Sejo, focusing on the inscription written out to memorize the completion of the Ganui-Dae project. We found that at least 12 persons took part in manufacturing the astronomical instruments of the Ganui-Dae project. Lee Cheon was involved in the production of four instruments, while Jang Yeong-Sil was involved in two; therefore, it seems that the achievement of Jang Yeong-Sil was overestimated. We also found that Jeong Cho (鄭招, ?-1434) was a scientist and Lee Cheon was an engineer in the early phase of the Ganui-Dae project, while King Sejong and Yi Sun-Ji (李純之, 1406-1465) played major role in the late phase. According to our study, King Sejong and Yi Sun-Ji were involved in the production of at least seven and five instruments, respectively. In conclusion, we believe that this study will be helpful to understand the practical manufacturers of the astronomical instruments invented during the Ganui-Dae project in the Joseon dynasty.

본 논문은 이자이의 《무반주 바이올린 소나타》 제2번 1악장에 대한 분석이다. 바흐의 《파르티타》 제3번 ‘프렐류드’와 그레고리성가 ‘진노의 날’에서 인용한 선율을 특징으로 하는 이 곡은 과감한 화성과 혁신적인 연주 기법으로 인해 독창적이며 동시에 실험성 짙은 작품으로 평가된다. 그러나 이 악곡이 취하는 소나타 형식의 구조와 디자인은 전통적인 틀 안에서 실험적 요소를 성공적으로 녹여낸 이자이를 절충주의 작곡가로 평가하게 한다. 바흐의 E장조 프렐류드는 이자이에 의해 a단조의 딸림화음으로 재맥락화되어 제1주제로 기능하고 있으며, 선법성 짙은 그레고리성가 역시 그 명맥을 유지한 채 딸림조성인 e단조에서 제2주제로 기능한다. 바흐와 이자이 사이 나타나는 다층적 대조는 유려한 성부진행을 만들며 쉔커가 말하는 소나타 형식의 제시부 조건을 충족시킨다. 거시적 버금딸림화음을 연장하는 발전부는 쉔커가 말한대로, 딸림화음을 향해 진행하지만 46화음을 통한 이례적 접근은 작품이 갖는 독창성을 확보해준다. 으뜸화음의 복귀와 함께 이루어지는 ‘진노의 날’은 재현부의 시작을 알리며, ‘뒤바뀐 소나타 형식’의 디자인을 제안한다. 원조성인 a단조 위에서 펼쳐지는 주제 요소들의 재배열은 바흐와 이자이 사이의 첨예한 대조를 죽음을 향한 비극으로 승화시킨다.

The royal astronomical observatory compiled the Astronomical Almanac during the Joseon dynasty, though there were some changes of its organization. However, the observatory underwent sudden changes in the late period mainly due to the influence of historical events such as the Gabo (甲午) and The Eulmi (乙未) Reforms in 1894 and 1895, respectively, and the Japanese invasion in 1910. In this paper, we study the changes of the compilation institution of the Korean Astronomical Almanac and of its organization for the period of 1894 to 1912. During this period, the name of the observatory had been changed several times, from Gwansanggam (觀象監) to Gwansangguk (觀象局) in 1894 and to Gwansangso (觀象所) in 1895. In addition, the affair of the Astronomical Almanac compilation was transferred to the Editorial Bureau [編輯局] of the Ministry of Education [學部] and to the Editing Department [編輯課] of the Governor-General of Korea [朝鮮總督府]. In 1907, the Gwansangso was abolished. Moreover, the affair of timekeeping was separated and the official number of personnel was reduced to less than 5% compared to that of Gwansanggam. Consequently, the royal astronomical observatory was significantly reduced in terms of its functions and the organization through the process of those changes. Therefore, we believe that this period is important when seeking to understand the transition between the traditional Astronomical Almanac of the Joseon dynasty and its modern astronomical counterpart of the present day.

During the Joseon dynasty, the Gwansanggam (觀象監, The Royal Astronomical Observatory) was the royal administration in charge of Astronomy (天文), Geography (地理), Calendars (曆), Astronomical and meteorological observation (測候), and Timekeeping (刻漏). Of those affairs, the Astronomical Almanac compilation was most important. In this paper, we study the education and selection of astronomical officials in the 19th century during the Joseon dynasty, focusing on Astronomical Almanac officials. According to this study, their main area was calendar calculation, and they were involved in Astronomical Almanac compilation for nearly 40 years, until they resigned. In addition, they served as Samryeok-susulgwan (三曆 修述官, Official for calendar calculation by the Shíxiàn calendar), and Ilgwa-gamingwan (日課監印官, Official printing supervisor). To undertake these core duties, an official had to pass several examinations and courses. The Gwansanggam (after Gwansangso) carried out the educational function for the officials. In particular, reserved officials of the astronomy division had to be educated starting with a trainee course.

We study the correlation between distributions of astronomical records and historical events using historical meteor (shower) records. In Korean chronicles, planets and meteor (shower) records are the most abundant astronomical phenomena. And they represent a general tendency of the number distribution of whole astronomical observations. We examine the correlation for the number distribution between meteors (showers) and planets during A.D. 1200-1700 and find that both records have a similar distribution. We classify historical events into three grades according to the social impact, and investigate the correlation between distributions of meteor (shower) records with social events, such as, new king's accession to the throne, foreign invasions, and domestic turmoils. From the statistical analysis, we cannot find any correlation between the meteor (shower) records and the political events. Therefore, we conclude that Korean historical records have not been influenced by the political events. We also examine the correlation between Chinese and Japanese meteor (shower) records and political events for A.D. 1200-1700, respectively, but cannot find any correlations between them.

This study is about the meaning of wooden brackets that are distinctive elements of wooden architecture in Korea, Japan, and China. Existing studies about wooden brackets have been limited to the boundary of formalism, so the object of this study is to make a breakthrough in the field of those studies. The Wooden brackets in this study are considered to be decorative elements, and the principles of their design are examined. The specific subject of the study is wooden architecture with Jusimpo-styled brackets that have brackets only on pillars. The definition of Jusimpo is reexamined first, and ChulMok-Ikkong which has not been regarded as a Jusimpo-styled wooden bracket is interpreted as Jusimpo-styled one in this study. Categorized into three types, Jusimpo is examined how it is expressed according to the type of the roof in a building. In view of the results, the wooden bracket system is an effective technique to express the formality, and two designing principles can be seen in Jusimpo; one that wooden brackets observed externally are standardized and regarded as the same ones, and the other that the style of wooden brackets used in the most formal building is Yi-ChulMok. These designing principles mean that the carpenter who was in charge of building the architecture had certain principles when expressing wooden brackets as well as the roofs according to the class of the architecture. In addition, although the styles of wooden brackets that were used in the most formal architecture during the Chosun period were mostly Dapo, Jusimpo in the form of Yi-ChulMok was also adopted in some temples depending on their scale, and that means Jusimpo-styled wooden brackets were never considered to be inferior to Dapo-styled ones. And this point leaves the argument that the reexamination of Jusimpo-styled wooden brackets which have been regarded as the style used in the attached building or small structures since the Choun dynasty should be conducted.

Lonicera caerulea var. edulis is a rare species found in some alpine region of Korea. Genetic variation in L. caerulea var. edulis has been investigated by examining 161 individuals from six natural populations: Mt. Seorak 1, Mt. Seorak 2, Mt. Jeombong, Mt. Bangtae, Mt. Gyebang, Mt. Halla. The mean genetic diversity for all the six populations was 0.25 (S.I.). The highest genetic diversity was found in Mt. Seorak (S.I.=0.3158) and the lowest was in Mt. Gyebang (S.I.=0.1047). Comparatively low level of genetic diversity was observed (Ae=1.25, P= 64.6%, S.I.=0.25), which is a typical pattern for rare tree species. AMOVA showed exceptionally large proportion of genetic variations both for among populations (34.69%) and within populations (65.31%). Excluding Mt. Gyebang, the genetic variation among and within population was 18.71% and 81.29% respectively. The UPGMA dendrogram based on genetic distance is not suitable for geographic relationship. Genetic distance of Mt. Gyebang was most distant from the other populations. Excluding Mt. Gyebang, the genetic identities among the five populations were 0.95 to 0.97, which is very high similarity level of genetic identity. This low level of genetic variations and the lack of site in nature indicates that L. caerulea var. edulis demanded a serious conservation.

국내에 분포하는 윤노리나무의 형태적 특징과 변이를 조사 하기 위하여 6곳의 윤노리나무 집단을 대상으로 실험을 수행하 였다. 분산분석 수행결과 21가지 정량적 형질 중 18가지 형질에 서 집단 간에 유의한 차이를 나타내는 것으로 확인되었다. 주성 분 분석 결과, 6가지의 주성분이 전체 분산에 대하여 68.28%의 설명력을 갖는 것으로 확인되었다. 제1주성분은 ‘엽병의 길 이’(0.764), 제2주성분은 ‘잎의 형태’(0.834), 제3주성분은 ‘잎의 길이’(0.753), 제4주성분은 ‘수관의 폭’(0.663), 제5주성분은 ‘화 서의 폭’(0.492), 제6주성분은 ’엽저의 모양‘의 특성이 높은 기여도를 나타냈다. 군집분석을 수행한 결과 ‘괴산군 쌍곡계곡’ 집 단이 이질적인 집단으로 확인되었다. 나머지 집단들은 ‘남해군 미조리상록수림’ 집단과 ‘함양군 상림’ 집단이 가깝게 유집되었 으며, ‘남해군 금산’ 집단, ‘진도 첨찰산’ 집단, ‘제주시 바리메오 름’ 집단이 하나의 소그룹을 이루었다.

국내에 분포하는 느티나무의 표현형의 변이를 확인하기 위하여 자생지 6곳을 대상으로 35가지 형태적 특징을 조사하였다. 분산분석 수행결과 20가지 정량적형질 중 16가지 형질이 집단간에 유의한 차이를 나타내는 것으로 확인되었다. 특히, '청주시 것대산' 집단이 20가지 정량적형질 중 9가지에서 최대값을 나타내었다. 주성분 분석 결과 측정항목들이 집단 간 차이를 나타내는데 적절하지 못함이 확인되었다. 군집분석을 수행한 결과 '남해군 미조리상록수림' 집단과 '양평군 용문산' 집단이 가장 가까운 그룹을 이루었으며, '청주시 것대산' 집단, '보은군 속리산' 집단, '대구광역시 팔공산' 집단, '함양군 상림' 집단 순으로 군집되었다.