• Proceedings of the Acoustical Society of Korea Conference
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• 1992.06a
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• pp.3-8
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• 1992

The theory of subjective preference with temporal and spatial factors which include sound signals arriving at both ears is described. Then, auditory evoked potentials which may relate to a primitive subjective response namely subjective preference are discussed. According to such fundamental phenomena, a workable model of human auditory-brain system is proposed. For eample, important subjective attributes, such as loudness, coloration, threshold of preception of a reflection and echo distrubance as well as subjective preference in relation to the initial time delay gap between the direct sound and the first reflection, and the subsequent reverberation time are well described by the autocorrelation function of source signals. Speech clarity, subjective diffuseness as well as subjective preference are related to the magnitude of inter-aural crosscorrelation function (IACC). Even the caktail party effects may be eplained by spatialization of human brain, i.e., independence of temporal and spatial factors.

• Journal of Ocean Engineering and Technology
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• v.30 no.3
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• pp.214-220
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• 2016

Imaging sonars such as side-scanning sonar or forward-looking sonar are becoming fundamental sensors in the underwater robotics field. However, using sonar images for underwater perception presents many challenges. Sonar images are usually low resolution with inherent speckled noise. To overcome the limited sensor information for underwater perception, we investigated preprocessing methods for sonar images and feature detection methods for a nonlinear scale space. In this paper, we focus on a comparative analysis of (1) preprocessing for sonar images and (2) the feature detection performance in relation to the scale space composition.

• Communications of the Korean Mathematical Society
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• v.35 no.1
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• pp.21-41
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• 2020

In this paper, we establish an explicit formula for r-Dowling numbers in terms of r-Whitney Lah and r-Whitney numbers of the second kind. This is a generalization of the Qi formula for Bell numbers in terms of Lah and Stirling numbers of the second kind. Moreover, we define the q, r-Dowling numbers, q, r-Whitney Lah numbers and q, r-Whitney numbers of the first kind and obtain several fundamental properties of these numbers such as orthogonality and inverse relations, recurrence relations, and generating functions. Hence, we derive an analogous Qi formula for q, r-Dowling numbers expressed in terms of q, r-Whitney Lah numbers and q, r-Whitney numbers of the second kind.

• Journal of Navigation and Port Research
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• v.27 no.6
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• pp.611-618
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• 2003

It can be said that the relationship between the maneuvering ability of operators and the navigational environment affects the safe degree of navigation in the collision avoidance situation. In order to reduce the occurrence probability of accident and to maintain the safety, it is necessary to clarify the relationship between human behavior and navigational environment. In this study, therefore, we analyzed and discussed the relationship between the maneuvering characteristics and the safety focused on human behavior as a fundamental factor of marine accidents using ship handling simulator and questionnaire. As a result, we concluded that navigational environment changes variously and the maneuvering ability of operators also varies with the navigational environment, and the ship handling characteristics strongly affect the occurrence probability of accident.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.52 no.3
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• pp.123-129
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• 2003

In this paper, a relationship between AC discharge progress and the radiated electromagnetic waves was investigated by measuring electromagnetic waves using a biconical antenna and a spectrum analyzer. The frequency spectrum of the radiated electromagnetic waves were measured at the atmospheric pressure in liquid nitrogen($LN_2$) during partial discharges progressed by AC high voltage in nonuniform electric field. Front the results of this study, a new method was introduced for measurement and analysis of the radiated electromagnetic waves with discharge progress in $LN_2$ Besides. according to the consideration of the mutual relation between frequency spectrum of the radiated electromagnetic waves and discharge progress, it was confirmed that detecting partial discharge and estimating discharge progress could be possible. It is considered that these results obtained from this investigation may be used as fundamental data for diagnosis and prediction of electric insulations about superconducting and cryogenic power equipments.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.280-281
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• 2006

This paper was analyzed fundamental about electrical characteristic of concrete to practical use base of building as Substitution Ground Electrode and Artificial Ground Electrode. 1) Gravel or Sand has a function that makes increase Resistivity of Concrete and Cement has a function that makes decrease Resistivity of Concrete. 2) Moisture Increase Work is so hard because of dry of Block but the Resistivity was decreased when the moisture of Concrete Block was gradually increased. 3) According to the measurement result of moltar and concrete block, ratio relation of Resistance and Resistivity of each block was thirty-fold difference.

• Honam Mathematical Journal
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• v.36 no.3
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• pp.531-542
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• 2014

Recently, Srivastava et al. [18] introduced the incomplete Pochhammer symbol and studied some fundamental properties and characteristics of a family of potentially useful incomplete hypergeometric functions. Here we introduce the incomplete Lauricella function ${\gamma}_D^{(n)}$ and ${\Gamma}_D^{(n)}$ of n variables, and investigate certain properties of the incomplete Lauricella functions, for example, their various integral representations, differential formula and recurrence relation, in a rather systematic manner. Some interesting special cases of our main results are also considered.

• The Bulletin of The Korean Astronomical Society
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• v.41 no.2
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• pp.55.2-55.2
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• 2016

In this talk, I will present a theoretical and numerical framework for self-regulation of the star formation rates (SFRs) in disk galaxies. The theory assumes (1) force balance between pressure support and the weight of the interstellar medum (ISM), (2) thermal balance between radiative cooling in the ISM and heating via FUV radiation from massive young stars, and (3) turbulent energy balance between dissipation in the ISM and driving by momentum injection of SNe. Numerical simulations show vigorous dynamics in the ISM at all times, but with proper temporal and spatial averages, all the expected balances hold. This leads to a scaling relation between mean SFRs and galactic gas and stellar properties, arising from the fundamental relationship between SFR surface density and the total midplane pressure.

• Proceedings of the KIEE Conference
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• 1989.11a
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• pp.94-97
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• 1989

It is shown that fundamental plasma characteristic, which are sheath voltage and ion concentration, can be derived from measuring RF impedence. Plasma characteristics from this simple method are verified by direct measuring, to be reasonable. Using these values a new relation between isotropy and the ratio of sheath voltage to ion concentration is derived. For etch in which $CF_4$ is used, anisotropic etch can be achieved in its order $10^{-12}Vcm^3$ and isotropic etch in $10^{-12}Vcm^3$. These results are useful in every asymetric diode type etch system.

• Child Health Nursing Research
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• v.4 no.2
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• pp.286-293
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• 1998

The purpose of this study was to investigate the level of anxiety for the mothers of leukemic children and to provide the fundamental data for the better performance of caring to them. The subjects were 292 mothers : 100 mothers whose children had a leukemia, 80 mothers whose children had taken a tonsillectomy, 112 mothers whose children with medical disease except cancer. The data were collected through The State-Trait Anxiety Inventory of Spilberger and analyzed by t-test, ANOVA Scheffe test. The results were as follows ; 1. The state anxiety mean score of mothers with leukemic children was 54.16. 2. The state anxiety of mothers with leukemic children was higher than that of the rest (F=8.00, P=0.0004). 3. There was no significant difference in anxiety of mothers with leukemic children in relation to leukemic children's and their mother's general characteristics.