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Complex object wave extraction using time-multiplexing in off-axis digital holography
Dashdavaa, Erkhembaatar,Erdenebat, Munkh-Uchral,Shin, Chang-Won,Kim, Nam OSA OPTICAL SOCIETY OF AMERICA 2018 Applied optics Vol.57 No.1
<P>In this paper, we present an algorithm for complex object wave extraction in off-axis digital holography using a time-multiplexing and frequency spectrum-shifting technique. The proposed approach utilizes the digital time-multiplexing technique, in which two 90-deg-rotated off-axis holograms are recorded in sequence, and corresponding spectra are subtracted in the computed Fourier domain to eliminate the DC term. Then, the two subtracted holograms are digitally multiplexed into one complex hologram in the same plane, and by shifting the spatial frequency spectra of the subtracted hologram in the spatial frequency domain, one of the two cross-correlations can be obtained in the center. This technique simply extracts the spectrum of the real image in the frequency domain than the spatial filtering method. (C) 2017 Optical Society of America</P>
Political Change and Human Rights Policy in South Korea and Mongolia
Dashdavaa Oyungerel(다시다와 어융게렐),Man-ho HEO(허만호) 충남대학교 사회과학연구소 2015 사회과학연구 Vol.26 No.3
This paper compares the shifts in human rights policy between South Korea and Mongolia based on the Five-Phase “Spiral” model, which explains how the introduction of international human rights norms in a repressive state can improve the human rights situation. According to the spiral model, continuous bilateral and multilateral network pressure, along with the mobilization and strengthening of domestic networks through transnational networks induce “regime change” and human rights policy change in the third phase, “Tactical Concession” and a transfer to the fourth phase, “Prescriptive Status”. South Korea and Mongolia transferred from a developmental dictatorship and socialist one-party dictatorship, respectively, into democratic regimes with outstanding changes in their human rights policies. Yet, when applying the spiral model, this study found a difference in the ‘transnational network pressure’ on each country, which also led to other differences in the ‘formation of the domestic actors’ and ‘sustained links to transnational networks’. As a result, the difference between the two countries which started with the change of human rights policy after the democratization and which is not mentioned in the spiral model, has meant that Mongolia still remains in the “Prescriptive Status” stage, whereas South Korea has moved on to the final phase, “Rule-consistent behavior.”
데.먀그마르(Dashdavaa Myagmar ) 단국대학교 몽골연구소 2023 몽골지역연구 Vol.8 No.1
The agricultural cooperation between Mongolia and South Korea lacks collaboration between the private sectors and is limited to only small-scale projects of governmental and non-governmental organizations at this time. Studying the agricultural cooperation between the two countries shows possible collaboration opportunities with potentially beneficial results for both Mongolia and South Korea. Therefore, for the benefit of the national economy, a collaboration between the private sectors of Mongolia and South Korea should be supported by the government. Assuming that the collaboration between the two countries on the production of highly demanded agricultural products in both the South Korean and the world market is potential, several versions of collaborating opportunities are demonstrated.
Munkh-Uchral Erdenebat,권기철,Erkhembaatar Dashdavaa,Yan-Ling Piao,유관희,Ganbat Baasantseren,김영민,김남 한국광학회 2014 Current Optics and Photonics Vol.18 No.6
An enhanced 360-degree integral-floating three-dimensional display system using a hexagonal lens array and a hidden point removal operator is proposed. Only the visible points of the chosen three-dimensional point cloud model are detected by the hidden point removal operator for each rotating step of the anamorphic optics system, and elemental image arrays are generated for the detected visible points from the corresponding viewpoint. Each elemental image of the elemental image array is generated by a hexagonal grid, due to being captured through a hexagonal lens array. The hidden point removal operator eliminates the overlap problem of points in front and behind, and the hexagonal lens array captures the elemental image arrays with more accurate approximation, so in the end the quality of the displayed image is improved. In an experiment, an anamorphic-optics-system-based 360-degree integral-floating display with improved image quality is demonstrated.