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 report the results of our study for ascertaining whether Ganui-dae built in the Josen Dynasty actually performed an astronomical role or not. The Ganui-dae was the first astronomical structure built as a part of the state astronomical undertakings by King Se-Jong. Our analysis was based on the Annals of the Joseon Dynasty. At first we extracted the records regarding Ganui-dae from the Annals of the Joseon Dynasty and then classified them under six heads according to their astronomical meaning and historical significance. From this analysis we found that the Ganui-dae performed the actual astronomical role. In addition, the provisional offices and peoples mentioned in the records show the astronomical correlation. Generally, when taking into account the functional side of the records, the Ganui-dae was related with the observation. Therefore, the Ganui-dae was the space for the astronomical activity. In conclusion, the Ganui-dae was built for the purpose of the astronomical activity.

국내･외 간접탄산화 연구는 기술의 경제성 확보를 위해 용제 재사용 방안에 초점을 맞추고 있으며, 효과적으로 재사용이 가능한 새로운 용제에 대한 연구를 필요로 하고 있다. 이에 본 연구에서는 킬레이트제인 trisodium citrate, malonic acid disodium salt, adipic acid disodium salt를 이용하여 알칼리 산업부산물인 제지슬러지 소각재(PSA)와 시멘트 킬른 더스트(CKD)로부터 칼슘을 용출하는 실험을 수행하였으며, 탄산화를 통해 고순도 탄산칼슘을 생성하고 용제를 재사용하는 방법을 알아보았다. 각 용제 별로 PSA와 CKD로부터 칼슘을 용출하고 탄산화하는 과정을 3회 반복하였고, 용제 재사용을 위한 칼슘용출 및 탄산화반응의 적정조건을 도출하였다. 실험결과, 모든 용제에 대해 칼슘용출효율은 CKD가 PSA보다 더 높았으나, 탄산화효율은 두 가지 산업부산물의 차이가 거의 없었다. 또한 3회의 용제 재사용 실험이 진행되는 동안 칼슘용출효율, 탄산화효율, 탄산칼슘 생성량 및 순도가 일정하게 유지되는 것을 확인하였다. 고액비 1:50 조건에서 PSA와 CKD로부터 칼슘을 용출하는 용제의 최적농도는 0.1~0.3 M이었으며, 탄산화효율은 70~90 %이었다. 용제를 3회 반복 사용하여 얻은 평균 이산화탄소 저장량은 용제별로 차이가 있었고, trisodium citrate, malonic acid disodium salt, adipic acid disodium salt 용제에 대해 각각 199, 125, 102 kg-CO2/ton-waste이었다. 탄산칼슘 생성량은 세 가지 용제에 대해 각각 452, 284, 232 kg-CaCO3/ton-waste이었다. 수득한 탄산칼슘은 XRD 분석을 통해 calcite임을 확인하였으며, 탄산칼슘의 순도는 최대 99.6 %이었다.