• Korean Journal of Mathematics
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• v.27 no.4
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• pp.1149-1157
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• 2019

We prove the Frenet type formulae for smooth one-parameter family of 2-planes or 3-planes in the Lorentz-Minkowski space 𝕃⁶. We consider two cases separately: the planes are spacelike or the planes are timelike.

• Journal of Korean Dental Science
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• v.14 no.1
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• pp.26-31
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• 2021

Purpose: This study aimed to find a correlation between the occlusal plane and two reference planes that are frequently used in semi-adjustable articulators. Materials and Methods: Sixty-two males and fifty females with normal articulation were recruited and the lateral cephalograms of these patients were taken. The angles between the Frankfort horizontal (FH) and the occlusal planes, the angles between the gnathologic and the occlusal planes, and the angles between the FH and gnathologic planes were measured on the lateral cephalograms. Result: The mean angles between the FH and the occlusal planes was 8.29°±3.62°, with 8.88°±3.09° and 7.63°±4.10° for male and female patients, respectively. The mean angles between the gnathologic and the occlusal planes was 2.77°±3.62°, and the angle between the FH and the gnathologic planes was 5.52°±3.62°. No significant differences were found in the measured angles between the male and female patients (P>0.05). Conclusion: Different guidance angles may be applied to articulators for prosthodontic restoration, depending on the reference planes that the articulators use.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.4
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• pp.836-845
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• 1998

In this ppaer, the confguration of multi-layers of the image planes surrounding the current trace of inite width has been considered, and the shielding performance of image planes is analyzed with the parameters of the width and conductivity of the planes, and the distance between the current trace and the planes. The induced current distributions on the image planes have bgeen calculated by solving a set of electric field integral equations by the method of moments. To cacluate the current distribution on the planes effectively, a new method for dividing integral intervals is proposed.

• Journal of Animal Science and Technology
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• v.56 no.6
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• pp.22.1-22.7
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• 2014

The present study was performed to investigate the effects of two groups of sires with 'medium' and 'high' weight gain potentials (M-sires and H-sires, respectively) on growth of their progenies on varying planes of nutrition during the growing-finishing period. The ADG of the M-sires' progeny was greater (P < 0.05) than that of the H-sires' progeny (0.51 vs. 0.47 kg) during a 26- to 29-d early grower phase beginning from 55 d of age, but the opposite was true (0.66 vs. 0.72 kg) during the latter grower phase. Overall grower-phase ADG was greatest on the high plane of nutrition (H plane) followed by the medium (M) and low (L) planes (0.65, 0.61, and 0.51 kg, respectively; P < 0.05) in the M-sires' progeny, whereas in the H-sires' progeny, ADG was greater on the H and M planes vs. L plane (0.63, 0.62, and 0.54 kg, respectively). The ADG of pigs on the M or H plane during the grower phase and switched to the H plane thereafter (M-to-H or H-to-H planes) was greater than that of pigs on the L-to-L planes (0.99 vs. 0.78 kg) during the early finisher phase in the M-sires' progeny (P < 0.01). However, in the H-sires' progeny, ADG of pigs on the L-to-L planes did not differ from that of pigs on the M-to-M or H-to-M planes (0.94 vs. 0.96 kg). Results suggest that the H-to-H or H-to-M planes and M-to-M or M-to-L planes are optimal for maximal growth of the M- and H-sires' progenies, respectively.

• The Journal of Korean Academy of Prosthodontics
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• v.33 no.4
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• pp.705-717
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• 1995

In clinical prosthetic dentistry the occlusal planes were represented to the dental arch form sagittally and composed of the occlusion morphologically. From now on the determinations of the occlusal planes were done through the facebow transfer and the cephalometric radiography, but they were not exact method for the diagnosis of the stomagnathic function. The purpose of this study is to examine the sagittal characteristics of occlusal planes using panoramic view between the normal subjects and the subjects with stomatognathic dysfunction. 60 normal subjects and 16 subjects with stomatognathic dysfunction were slectec for this investigation. We measured the inclination of occlusal planes to Frankfurt Horizontal plane. The occlusal planes were divided into 4 groups : 1) The plane between the midpoint of upper central incisor and the mesiobuccal cusp of upper 1st molar, 2) The plane between the midpoint of upper central incisor and the mesiobuccal cusp of upper 2nd molar, 3) The plane between the midpoint of upper central incisor and the distobuccal cusp of upper 2nd molar, 4) The plane between the mesiobuccal cusp of 1st molar and the distobuccal cusp of 2nd molar. The results were as follows : 1) The occlusal planes could be determined very easy by using panoramic view, 2) Among the angles between the occlusal planes and the FH plane, the angles related with the 2nd molar were more steep than those of the 1st molar. The angle between the 1st molar and the 2nd molar is the most steep in the other angles. 3) In the angles between occlusal planes and FH plane, the subjects with stomatognathic dysfunction were more significant steep(p<0.05) than the normal subjects.

• Economic and Environmental Geology
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• v.8 no.4
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• pp.203-210
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• 1975

The engineering properties of some Gyeongsang sedimentary rocks with respect to the grain size and the orientation of bedding planes were studied. The suitability of the rocks for civil and architectural construction was also investigated. The porosity of the rocks increases in proportion to the grain size. The ratio of the strain due to stress perpendicular to the bedding planes to the strain resulting from stress parallel to the bedding planes increases as the grain size decreases. The study indicates however, that the ratio of Young's modulus due to stress perpendicular to the bedding planes to Young's modulus resulting from stress parallel to the bedding planes increases in proportion to the grain size. The compressive strength of the sandstones studied is much greater than the strength of the conglomerate or shale. Only the coarse grained sandstone can be used for civil and architectural construction, regardless of the orientation of bedding planes. The relationships between compressive strength and density, elasticity and porosity, and compressive strength and mineral content were also studied.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.6 no.4
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• pp.28-36
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• 1995

The use of image planes can reduce effectively the radiated emissions from a printed circuit board. This work deals with the influence of image planes on radiation from current trace. The configu- rations of one and two layers of image planes on both sides of current trace are proposed. The radiated emissions of those configurations have been calculated by solving a set of electric field integral equations by the method of moments. The induced current distributions on image planes and the radiation patterns are analyzed for different configurations of image planes, the distance between current trace and image planes, and the frequency of signal current.

• Journal of electromagnetic engineering and science
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• v.13 no.1
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• pp.51-53
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• 2013

A MIMO antenna using the resonance of ground planes is proposed for 4G mobile application. A resonant mode is generated when the double ground planes (upper and lower) in the mobile terminal are excited as the radiator. By combining the resonant modes contributed from both the antenna element and the ground planes, the proposed MIMO antenna realizes a wideband property over LTE band 13. In addition, an inductive coil is employed to reduce the antenna volume. These approaches not only simplify antenna design but also effectively improve bandwidth and efficiency. The proposed MIMO antenna has an excellent ECC value of below 0.1 because of the nearly orthogonal radiation patterns of the two radiators. Moreover, an additional antenna is adopted to cover WiMAX, WLAN, and Bluetooth services simultaneously in frequency range from 2 GHz to 2.7 GHz.

• Ocean Systems Engineering
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• v.10 no.3
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• pp.289-316
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• 2020

In the present paper, the effect of the location of stern planes on the flow entering the submarine propeller is studied numerically. These planes are mounted on three longitudinal positions on the submarine stern. The results are presented considering the flow field characteristics such as non-dimensional pressure coefficient, effective drag and lift forces on the stern plane, and the wake flow formed at the rear of the submarine where the propeller is located. In the present study, the submarine is studied at fully immersed condition without considering the free surface effects. The numerical results are verified with the experimental data. It is concluded that as the number of planes installed at the end of the stern section along the submarine model increases, the average velocity, width of the wake flow and its turbulence intensity formed at the end of the submarine enhance. This leads to a reduction in the non-uniformity of the inlet flow to the propulsion system.

• Archives of Plastic Surgery
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• v.32 no.2
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• pp.194-198
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• 2005

In many reports on the reconstruction of an orbital blowout fracture, CT(computed tomography) imaging has been used for postoperative evaluation. However, in most cases, only one plane of the CT scan was presented, which may not be sufficient for accurate evaluation. This study reviewed the CT scans presented in the related 49 articles (56 cases), and investigated our patients (150 cases) to investigate where were the most frequent unfavorable reconstructions, and to determine which planes should be presented for accurate evaluation. One plane of the CT scan was presented in 70% of the cases. On the other hand, 30% of the cases presented two planes of the CT scans. In our cases, the most prevalent sites for an unfavorable reconstruction were the posterior portion of the inferior wall, and the posterior and the inferior portion of the medial wall. In order to accurately evaluate an orbital wall reconstruction, at least two planes of a CT scan are needed. For an inferior wall evaluation, both the middle and the posterior planes of the coronal section or both the coronal and the sagittal sections are necessary. In addition, for the medial wall evaluation, both the axial and the coronal sections or both the middle and the posterior planes of the coronal section are required.