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Thesis on Nature Magazine's Stablemate
작성자 Department of External Cooperation 작성일 2014-03-27
조회수 1932
작성자,작성일,첨부파일,조회수로 작성된 표
Thesis on Nature Magazine's Stablemate
Department of External Cooperation 2014-03-27 1932

The thesis from PKNU posted on stablemate of Nature magazine <SCIENTIFIC REPORTS>.
- The thesis is about the success of sound emitting with acoustic metamaterial without any electronic device.
- Kim Je-Do, the professor of Pukyong National University, conducted joint research with Korea Institute of Machinery and Materials.

Kim Je-Do, who is a professor of mechanical engineering department in Pukyong National University, recently posted his thesis worked together with the doctor Song Gyung-Jun from Korea Institute of Machinery and Materials on a March number of SCIENTIFIC REPORTS (online version) which is a stablemate of Nature magazine what is famous as the one of top three science magazine.

The subject of thesis is 'Emission Enhancement of Sound Emitters using an Acoustic Metamaterial Cavity'.

The professor Kim and his coworker succeeded to realize amplification device sending new low frequency using acoustic metamaterial which is getting notable recently. This material is a repetitive zigzag-shaped structure made of aluminum.

This research is notable in the aspect of that it can amplify sound as ten times even though there are no electric devices for the amplification. By so far, the sound can be amplified through transferring sounds to electric device after changing it as electric signal.

This research is also meaningful because it succeeded to amplify long sound wave with subminiature acoustic metamaterial. In the case of 1060Hz frequency, they have a frequency of 32cm long, and they need a structure corresponding to the size to adjust it. However, this research succeeded to amplify the sound wave with subminiature acoustic metamaterial which is a structure what has 1cm of unit cell and 4cm of width.

The material can amplify very long sound wave without any helps of electric devices, so development of the material can be used remote control system in the future such as making micro speaker, improvement of underwater communication, and amplification of transmitting ultrasonic waves signal.

In the case of underwater communication, the material helps to send signals further, and it applies to ultrasonic waves in the same way. When ultrasonography is going on, the power of wave falls down rapidly as it is in human body. However, the material can amplify it, so it can improve the imaging range of ultrasonic waves. It also amplifies waves in the sea, so it can make wave-power generation possible even in the calm ocean.

Meanwhile, the professor Kim got his master's and doctor's degree in University of Michigan in USA after graduated mechanical engineering department of University of Toronto in Canada. His major is thermodynamics & fluid mechanics and acoustic metamaterial.

As he was appointed as professor of engineering colleges of Pukyong National University in September 2012, he is in charge of 4 subjects in the major: the practice of programming, the fluid mechanics, the applied fluid mechanics, and the numerical analysis. He gives lecture in English three of them.<Pukyong today>
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