Jo Jan 12, 2022
Many kinds of buoyant offshore structures such as wave energy converters (WECs) and weather buoys are being utilized to capture energy from the sea, protect coastal lines and study marine meteorology.
Since these structures often work for a long period of time, mooring systems are adopted to maintain their original positions, which is related to wave diffraction.
Rim Un Ryong, a researcher at Faculty of Shipbuilding and Ocean Engineering, has developed a novel DtN condition on a lateral cylindrical surface to solve three-dimensional wave diffraction by arbitrary-shaped floating bodies in water of finite depth.
First, he formulated wave diffraction with an artificial cylindrical boundary and derived a DtN condition on the artificial boundary.
Then, from the given boundary conditions, he solved wave problems numerically by implementing BEM and obtained the results for a chamfer box and their array.
The result showed that in the case of a single box, the plots for the amplitudes of heave and surge forces according to the incident wave direction have minimal values in the vicinity of the points in which the length of the box is integer times larger than the incident wavelength.
Besides, they witnessed more fluctuations for an array of the boxes than in the case of a single box, and the amplitude of surge force on the box became larger in the case of having other objects around it.
He presented his essay titled “Wave diffraction by floating bodies in water of finite depth using an exact DtN boundary condition” to SCI journals “Ocean Engineering”.
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Jo Jan 10, 2022
A research group with Sin Tong Ho, a researcher at Faculty of Mining Engineering, as a leader has developed and introduced a vertical shafting air classifier equipped with a rotor cage with high classification efficiency and an assistant air pipe that makes it possible to realize accurate classification as well as to control classification size in the processes of dry fine grinding or microfine grinding-classification of fireproof material, chemical material, abrasive material, etc.
They selected a reasonable structure and made a hydrodynamic analysis of the motion characters of mineral particles in the rotor cage. On this basis, they made an optimal design of structural and operational parameters and put them on a scientific basis so that they could ensure needed particle size distribution of powder products and high productivity.
The feed size of this classifier is less than 0.1mm and its classification size is 10~74㎛.
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Jo Jan 6, 2022
Recognizing the importance of cooperation between professional teaching designers and program experts in making high-standard teaching plans, Kim Jang Hak, a section head at Faculty of Distance Education, has solved theoretical and practical problems for intensifying their cooperation, thus making sure all lecturers produce high-standard teaching plans.
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