.png)
.png)
Find undersea relics with "3D frequency" at Myeongnyang Naval Battlefield Battlefield (2020.08.14)
Researchers in Korea have launched an exploration of "Uldolmok." Utilizing the 3D acoustic wave exploration system.
The EOS-wing constituting a part of the 3D acoustic wave exploration system (EOS3D). Provided by the Korea Institute of Geological Resources Development.
Henry V, king of England in the 15th century, is famous for his repeated victory after resuming the 100-year war against France, which had been in a ceasefire for a while. The first contributor to the victory in the battle against France is known as "the Grace Dieu." Buried in the intertidal sediment of the Hamble River in Hampshire, southern England, Grace Dewe has a very important archaeological value in identifying the maritime battles of Henry V.
However, the hull was buried in the sediment of the riverbed and the algae were strong, making it difficult to find relics as well as analyze the exact size and three-dimensional (3D) structure of the ship. Archaeologists at the University of Southampton in the UK have combined technology to obtain three-dimensional images by firing sound waves underwater with a satellite positioning system (GPS). As a result, it was confirmed that Grace Dew, buried in the riverbed, was 60m long and 16m wide.
In Korea, the challenge of finding undersea relics in this way begins. It was at Uldolmok, a battlefield of the Battle of Myeongnyang, where Admiral Yi Sun-sin defeated 133 Japanese fleets with more than 10 fronts in 1597.
○ Look more clearly and accurately at the shape of the marine relic
Uldolmok, a narrow sea route between Haenam and Jindo, Jeollanam-do, has limitations in diving investigations as most cultural properties are buried on deep floors with strong currents.
On the 12th, the Pohang Geological Resource Demonstration Research Center of the Korea Institute of Geological Resources launched a joint exploration using the "Yeongeun Sea Three-Dimensional Elastic Wave Exploration System (EOS3D)" in Jindo, Jeollanam-do, the stage of the Battle of Myeongnyang.
EOS3D is similar in principle to the "3D chirp" technology developed by researchers at Southampton University to explore Grace Dew. Modulating acoustic frequencies in the 2 kilohertz (kHz) and 8 kHz bands and shooting them underwater is called chirp. The principle is to record sound frequency signals reflected from the sea floor and analyze reflection characteristics to estimate the structure of objects buried in the sea floor and the sea floor.
The technology of producing images with signals reflected from the surface of objects after shooting sound waves has been used in the past. However, the story of the exploration of underwater cultural properties involving the divers' hard diving investigation is different. Highly precise 3D images are required because temporal and physical limitations of diving surveys must be considered. It took years to develop a technology that could accurately mark the exact exploration point by analyzing sound wave signals and precisely correcting location information.
Since 2010, researchers from the Korea Institute of Geology have developed EOS3D technology in partnership with a private company called "Geoview" to localize underwater archaeological exploration technology. In 2015, it succeeded in obtaining a three-dimensional image of the ship "Mado 4," which sank near Mado, Taean-gun, Chungcheongnam-do during the initial technology development stage of EOS3D. Through follow-up research, both sound wave generators and receivers were localized and applied to underwater exploration in the waters near Uldolmok.
On top of that, real-time location measurement (RTK)-GPS technology was also combined to accurately grasp the traces of acupuncture lines buried underwater and the location of cultural properties at several cm levels. This technology is a state-of-the-art system that corrects real-time location information errors while moving and is also applied to unmanned vehicles such as drones.
○Identify the cause of the undersea earthquake and use it to manage undersea cables.
Ha Ji-ho, a senior researcher at Pohang Geological Resource Demonstration Research Center, said, "EOS3D technology is a technology that represents three-dimensional submarine geological structures in coastal waters and objects buried in shallow sea bottoms in high-resolution images."
Through an exploration study scheduled for 2027, the researchers plan to discover traces of acupuncture ships buried in the waters near Uldolmok as well as ceramics and war relics of the Joseon Dynasty. In addition, the EOS3D system will be used for further investigation to find the cause of more than 70 concentrated earthquakes in Haenam, Jeollanam-do.
Senior researcher Ha said, "We also succeeded in obtaining three-dimensional images of submarine cables in the southwest sea wind development complex in April using EOS3D technology. We expect it to be of great help in investigating and protecting underwater cultural properties by exploring the size, condition, and type of marine relics."
Reporter Kim Minsoo of Dong-A Science, reborn@donga.com
Good Morning Korea Live Episode 34 / [Into the real scene] Going to the underwater cultural property exploration site (16 minutes)
![[Repo] When I went to "2023 Military Industry Development Exhibition"](https://static.wixstatic.com/media/582ab3_aacc57159468452a878c885e02fc57e3~mv2.png/v1/fill/w_74,h_55,fp_0.50_0.50,q_95,enc_auto/582ab3_aacc57159468452a878c885e02fc57e3~mv2.png)
!["Synerex" is targeting the drone market with "remote sensing" [Startup-ing]](https://static.wixstatic.com/media/582ab3_4d962599c0e448e89c46b4005a971d9e~mv2.png/v1/fill/w_74,h_56,fp_0.50_0.50,q_95,enc_auto/582ab3_4d962599c0e448e89c46b4005a971d9e~mv2.png)
