Euler deconvolution (ED) has been one of the popularized interpretation techniques in magnetic prospecting, which is based on the well-known Euler’s equation and the concept of structural index (SI). It makes it flexible to implement calculation of parameters for typical types of geological bodies such as fault, magnetic boundary and dyke, and it has been widely applied to practical problems.

In the case of high-precision ground magnetic surveys, for several reasons such as topography, river flow, cliff, etc., raw field data are hardly given on a rectangular grid but collected along crooked profiles in general. Such data should be interpolated into a rectangular grid with availability of the ED technique; this may lead to a distortion of original data and erroneous analysis results.

Kim Il Hyok, a section head at the Faculty of Earth Science and Technology, proposed a new 2D & 3D Euler deconvolution scheme of magnetic data irregularly spaced on an uneven topographic surface.

The scheme first inverts the given irregular ground magnetic data to obtain subsurface equivalent sources, from which horizontal and vertical derivatives are calculated directly on the given data points. Then, it, based on the ED equation, simultaneously estimates the structural index (SI) and the window radius. Finally, the depth and position of a magnetic body are calculated based on the estimated structural index and the window radius.

He verified the validity of the proposed method via synthetic and field datasets. The method gives correct structural index and location even under moderate Gaussian noise, which demonstrated its accuracy and noise resistance.

You can find the details in his paper “Euler Deconvolution of Irregular Ground Magnetic Data” in “Proceedings of KUTIC-2025”.

Proper and effective exploitation and utilization of underground resources requires a good development design of deposits. What is of great importance and priority for it is to optimize the production capacity and production life of mines. The production capacity and lifetime are the basic conditions for mine design.

Economic evaluation of deposits is conducted in accordance with technical, economic and socio-political requirements. The accuracy of this evaluation depends on the validity of collected information. The economic evaluation of deposits is performed through geological, feasibility and economic study stages, and the information required for this process should be collected and processed. The production capacity and lifetime of mines are just preliminarily evaluated in the feasibility study stage.

In the literature, the preliminary evaluation of the production lifetime of a deposit (or mine) is presented. Here, the empirically obtained Taylor Formula is used.

Ri Kwang Su, a section head at the Faculty of Earth Science and Technology, further improved the empirically obtained Taylor Formula through mathematical modeling.

He applied a method of comparing the results by analyzing the regression with SPSS 20 with the data used in making an empirical formula for the preliminary assessment of the life of deposits.

The results showed that the new power equation is the most suitable and it also has smaller absolute and relative errors than the Taylor Formula.

You can find his paper “Improvement of the Taylor-Formula for Preliminary Assessment of the Optimal Lifetime of the Ore Deposits” in “Proceedings of KUTIC-2025”.

The microwave cavity filter, which is operated by coaxial resonators with high Q-factors above 4 000, has high power and high performance.

Coupling matrix synthesis is the most important step in the design of microwave filters. This is because coupling matrix is the most critical in mapping the theoretical filter characteristic polynomial to the parameters of a physical filter model.

The coupling matrix of a microwave cavity filter is not a feasible topology, so it must be reconstructed by performing a similarity transformation. The reconstruction of coupling matrix using the rotation matrix is not suitable for lossy filter design and there are several problems in reconstructing the coupling matrix, which necessitates different approaches.

Kim Chol Jin, a researcher at the Faculty of Communication, proposed using hyperbolic reflection matrix in the coupling matrix synthesis to design a microwave cavity filter for use in mobile station remote radio units.

First, he synthesized an orthogonal matrix that can simplify the complex coupling matrix obtained in the design of a microwave filter with loss considerations. Then, he solved the problem of code control of cross-coupling arising in reconstructing a general coupling matrix.

The experimental results show that a coupling matrix is reconstructed to have desired topology and that a hyperbolic reflection matrix can reconstruct a complex coupling matrix.