Jo Sep 1, 2021
Jong Kwang Hyok, the head of Laboratory at Faculty of Applied Chemical Engineering and his research group succeeded in producing non-toxic low-cost nano micellar functional material that can be used as starch derivative for drug delivery, high purity refiner of the object material and environmental improvement material with our own raw material.
This functional polymer based on starch guarantees 15~80℃ of thermal response range, ±0.1℃ of response accuracy, 1~10.4 of pH response range, and 50~90mg/L of micelle critical concentration range.
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Jo Aug 18, 2021
Kim Jin Hyok, student at Faculty of Physics presented a paper “Joint Estimation of Self-mixing Interferometry Parameters and Displacement Reconstruction Based on Local Normalization” to SCI Journal “Applied Optics”.
During the research he found out that normalization methods used in processing self-mixing signals proved to be irrational in practical application because of the limitation in coverage and measurement accuracy due to the changes in some information of signals.
Therefore, he proposed a local normalization that enables high-speed accurate measurement of major constants of sensors by reducing the number of sample points, and a simple algorithm with which displacement information of the object can be accurately determined on the basis of it.
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Jo Aug 16, 2021
Researcher Hong Myong Son at Faculty of Materials Science and Technology and his research group succeeded in producing non-magnetic hard alloy which contains no cobalt with domestically available raw materials. This kind of alloy is used as the basic material of molding tools and is urgently needed in the various sectors of the national economy.
The hardness of this alloy is more than HRA 91, the bending strength more than 1.8GPa and the saturation magnetization strength less than 3Gs.
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Jo Aug 9, 2021
Pak Se Yang, a researcher at Science Engineering Institute, reported a paper “Data-driven Robust Controller Design by Geometric Constraints in Frequency-Domain” in SCI magazine "International Journal of Dynamics and Control".
In the paper, he found that the representation of the performance factor of the Robust controller with geometric limit in frequency domain has a drawback of disagreement between the control ability and design characteristics due to the strict assumption and large error, and proposed a new method to enhance the control ability by improving geometric limit.
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Jo Aug 4, 2021
The research team led by Kim Ryul, a researcher at the Faculty of Electrical Engineering, has developed metallic oxide lightning arrester for high voltage based on the domestic resources, thus contributing to the regular operation of electric equipment.
The non-interval metallic oxide lightning arrester is made by sintering the mixture of zinc oxide and other oxides such as arsenic oxide, aluminium oxide at over 1 150℃. The voltage degree of nonlinear resistance of the metallic oxide lightning arrester is over 318V/mm.
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Jo Jul 15, 2021
Pak Se Yang, a researcher at Science Engineering Institute, reported a paper “Senseless vector control of PMSM with parameter error compensation” in SCI magazine "International transactions on Electrical Energy System"31(5).
In the paper, he carefully analyzed the drawback of preceding studies that error compensation algorithm is rather complicated and inefficient.
Based on it, he proposed a new method for enhancing the estimation and control correctness by estimating the current value based on motor model and compensating the element made by parameter error separately in the error compared with measured value.
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