• Journal of Korea Water Resources Association
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• v.54 no.11
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• pp.903-913
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• 2021

In the flood season, the measurement of the river discharge has many restrictions due to reasons such as budget, manpower, safety, convenience in measurement and so on. In particular, when heavy rain events occur due to typhoons, etc., it is difficult to measure the amount of flood due to the above problems. In order to improve this problem, in this study, a method was developed that can measure the river discharge in a flood season simply and safely in a short time with minimal manpower by combining the functions of a drone and a surface velocity doppler radar. To overcome the mechanical limitations of drones caused by weather issues such as wind and rainfall derived from the measurement of the river discharge using the conventional drone, we developed a drone with P56 grade dustproof and waterproof performance, stable flight capability at a wind speed of up to 36 km/h, and a payload weight of up to 10 kg. Further, to eliminate vibration which is the most important constraint factor in the measurement with a surface velocity doppler radar, a damper plate was developed as a device that combines a drone and a surface velocity Doppler radar. The velocity meter DSVM (Dron and Surface Veloctity Meter using doppler radar) that combines the flight equipment with the velocity meter was produced. The error of ±3.5% occurred as a result of measuring the river discharge using DSVM at the point of Geumsan-gun (Hwangpunggyo) located at Bonghwang stream (the first tributary stream of the Geum River). In addition, when calculating the mean velocity from the measured surface velocity, the measurement was performed using ADCP simultaneously to improve accuracy, and the mean velocity conversion factor (0.92) was calculated by comparing the mean velocity. In this study, the discharge measured by combining a drone and a surface velocity meter was compared with the discharge measured using ADCP and floats, so that the application and utility of DSVM was confirmed.

• Journal of the Daesoon Academy of Sciences
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• v.27
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• pp.35-77
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• 2016

All humans are subject to death, and this creates a motivation to construct theories regarding divine immorality (神仙思想) in order to satisfy the human desire (慾望) for eternal life (長生) and the avoidance of death(不死). In the concept of Earthly immortality (地上神仙) from Daesoonjinrihoe (大巡眞理會), devotees do not carry out their work in a deep mountain ranges far removed from human society. Instead, they cultivate themselves in Dao from within the human society (自身修道), chant incantation to benefit others, aspire towards immortal status (神仙), and promote harmony between divine beings and humans (神人調和) all without ever leaving human society. In the Yeoju Headquarters of Daesoonjinrihoe, members created a new place called a "Dojang (道場 temple complex)" to live as immortal humans in the here and now while they chant incantations (呪文) as an act of participation in the Immortal Realm of the Later World (後天仙境). Some key religious and fengshui (geomancy) oriented symbols used within the Yeoju Headquarters of Daesoonjinrihoe appear as follows: first, Cheonggye Tower (靑溪塔) represents faith in traditional astrology (星宿神仰) and reverence for the God of the Nine Heavens (九天上帝). Second, Daesoonjinrihoe (大巡眞理會) emphasizes the Saturn associated earth element from five phases (五行土星) and this represent the Later World due to numerological associations. Third, the Fengshui of the Yeoju Headquarters of Daesoonjinrihoe is a highly propitious (吉地) and also accentuates the Saturn associated earth element from five phases. Fourth, Yeongdae (靈臺) in the Yeoju Headquarters of Daesoonjinrihoe faces west where Jeungsan will come accompanied by other gods (神命). Fifth, the Yeoju Headquarters of Daesoonjinrihoe is in charge of property and receives happiness and prosperity (福祿) through its Fengshui. The Yeoju Headquarters of Daesoonjinrihoe is an earthly paradise for immortals (地上天國) forged to achieve the ultimate purpose of transforming its members into the Dotong (道通, those enlightened in Dao and thereby successful in their every endeavor) of the Later World. In accordance with Daesoon thought, the Saturn associated earth element from five phases is positioned in the middle of incantations, and Yeongdae, other architecture, and landscaping has all been arranged to correspond with Daesoon geomancy and numerology (後天數理).