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A STUDY ON THE RELATIONSHIPS BETWEEN MAXIMUM OPENING AND MAXIMUM CAPACITY OPENING DISTANCE (최대개구와 최대용양개구에 관한 연구)

  • Chin, Yong-Whan;Lee, Cheol-Hoon;Kim, Yung-Soo;Koo, Ok-Kyung
    • The Journal of the Korean dental association
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    • v.10 no.2
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    • pp.109-113
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    • 1972
  • The measuring tests on the maximum opening distance and the maximum capacity opening distance were conducted on the one hundred normal dental college students and staffs o Seoul National University in order to study the relationships between the maximum opening distance and maximum capacity opening distance. The results were as follows: 1. The maximum opening distance and maximum capacity opening distance were not coincided. 2. The distance of the maximum opening was higher than that of the maximum capacity opening. 3. Physiologic reflex was caused by the water injected into the mouth. 4. The correlation between the maximum opening distance, and maximum capacity opening distance was hardly recognized. 5. Each correlation of the weight height and cheek thickness to maximum opening distance and maximum capacity opening distance was not recognized.

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New Method for MPPT Control of Photovoltaic System (태양광전시스템의 최대출력점추적제어를 위한 새로운 방식)

  • Chung, C.B.;Jho, J.H.;Jho, J.M.;Jeon, K.Y.;Lee, S.H.;Oh, B.H.;Kim, Y.J.;Han, K.H.
    • Proceedings of the KIEE Conference
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    • pp.1256-1258
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    • 2003
  • The solar cells should be operated at the maximum power point because its output characteristics are greatly fluctuate on the variations of insolation, temperature and loads. To obtain maximum power from solar cell, photovoltaic system cell power system usually requires maximum power point tracking controller. This paper propose Maximum power point tracking method using zero slope of differential value of maximum power. The power compare method traces to maximum power point rapidly but oscillate on the maximum power point largely, when quantity insolation variation is big. The power compare method is traces to maximum power point slowly but oscillate maximum point on the maximum power point smally, when quantity insolation variation is small. To solve two problem of the power compare method, designed zero slope of differential value of maximum power.

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A MPPT Control of Photovoltaic System for Current ripple reduce (전류리플 저감을 위한 태양광발전시스템의 최대출력점추적제어)

  • Chung, Choon-Byeong
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.496-499
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    • 2006
  • The solar cells should be operated at the maximum power point because its output characteristics are greatly fluctuate on the variations of insolation, temperature and loads. To obtain maximum power from solar cell, photovoltaic system cell power system usually requires maximum power point tracking controller. This paper propose Maximum power point tracking method using zero slope of differential value of maximum power. The power compare method traces to maximum power point rapidly but oscillate on the maximum power point largely, when quantity insolation variation is big. The power compare method is traces to maximum power point slowly but oscillate maximum point on the maximum power point smally, when quantity insolation variation is small. To solve two problem of the power compare method, designed zero slope of differential value of maximum power.

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THE RANGE OF r-MAXIMUM INDEX OF GRAPHS

  • Choi, Jeong-Ok
    • Bulletin of the Korean Mathematical Society
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    • v.55 no.5
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    • pp.1397-1404
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    • 2018
  • For a connected graph G, an r-maximum edge-coloring is an edge-coloring f defined on E(G) such that at every vertex v with $d_G(v){\geq}r$ exactly r incident edges to v receive the maximum color. The r-maximum index $x^{\prime}_r(G)$ is the least number of required colors to have an r-maximum edge coloring of G. In this paper, we show how the r-maximum index is affected by adding an edge or a vertex. As a main result, we show that for each $r{\geq}3$ the r-maximum index function over the graphs admitting an r-maximum edge-coloring is unbounded and the range is the set of natural numbers. In other words, for each $r{\geq}3$ and $k{\geq}1$ there is a family of graphs G(r, k) with $x^{\prime}_r(G(r,k))=k$. Also, we construct a family of graphs not admitting an r-maximum edge-coloring with arbitrary maximum degrees: for any fixed $r{\geq}3$, there is an infinite family of graphs ${\mathcal{F}}_r=\{G_k:k{\geq}r+1\}$, where for each $k{\geq}r+1$ there is no r-maximum edge-coloring of $G_k$ and ${\Delta}(G_k)=k$.

A METHOD FOR COMPUTING UPPER BOUNDS ON THE SIZE OF A MAXIMUM CLIQUE

  • Kim, Koon-Chan
    • Communications of the Korean Mathematical Society
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    • v.18 no.4
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    • pp.745-754
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    • 2003
  • Maximum clique problem is to find a maximum clique(largest in size) in an undirected graph G. We present a method that computes either a maximum clique or an upper bound for the size of a maximum clique in G. We show that this method performs well on certain class of graphs and discuss the application of this method in a branch and bound algorithm for solving maximum clique problem, whose efficiency is depended on the computation of good upper bounds.

COMPARISON OF MAXIMUM OCCLUSAL FORCES ON OSSEOINTEGRATED IMPLANT SUPPORTED FIXED PROSTHESES AND NATURAL TEETH (골유착성 임플랜트 지지 고정성 보철물과 자연치의 최대교합력 비교)

  • Kwon Young-Sook;Hwang Sun-Hong;Han Dong-Hoo
    • The Journal of Korean Academy of Prosthodontics
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    • v.43 no.4
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    • pp.498-510
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    • 2005
  • Purpose: The purpose of this study was to compare the maximum occlusal force implant prostheses to natural teeth. Material and Method: Fifty nine patients treated either with $Br{\aa}anemark$ implants and ITI implants during the recent ten years were involved in this study. The maximum occlusal force were measured with unilateral bite force recorder and dental prescale system. Results: 1. The maximum occlusal forces of the implant prostheses and natural teeth were not significantly different where measured with unilateral bite force recorder and dental prescale system. 2. The maximum occlusal forces were not significantly different between $Br{\aa}nemark$ implant and ITI implant prostheses. 3. The maximum occlusal forces of the implant prostheses had lower when compared with natural teeth during 1-6 months functional periods when measured with the unilareral bite force recorder(P<0.05) and 1-12 months functional periods when measured with the dental prescale system(P<0.05). After these periods there was not statistical significant difference between the implant prostheses and natural teeth. 4. The maximum occlusal forces of the wide diameter implant prostheses were higher than the maximum occlusal forces of the regular diameter implant prostheses when measured with dental prescale system(P<0.05), but there was no significant difference between the wide diameter and the regular diameter implant prostheses when measured with unilateral bite force recorder. 5. The maximum occlusal forces of the single implant prostheses were not significantly different with the splinting implants prostheses. 6. The maximum occlusal forces of the implant prostheses were not significantly different by age and sex. 7. There was significantly different between maximum occlusal forces measured with unilateral bite force recorder and dental prescale system(P<0.0001) but there was positive correlation(r=0.52. P<0.05). Conclusion: The maximum occlusal forces of the implant prostheses were not significantly different to natural teeth during clenching and unilateral maximum biting.

Lateral long term behavior of Driven H-Piles in Embankment (성토지반에 타입된 H 말뚝의 횡방향 장기지지거동)

  • 박영호;정경자;김주경;김동인
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.575-582
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    • 2002
  • To find a lateral long term behavior of driven H-piles in embankment, inclinometer is installed at pile and measurement is done during a year. When behavior of measured slope angles is in accord with behavior of nonlinear p-y curves(Reese, Murchison and O'Neil, Matlock's p-y analysis), maximum displacement of pile head, maximum stresses and maximum bending of pile obtained from the numerical analysis are shown. As results, maximum lateral displacement at pile head, maximum stress and maximum bending moment of pile are shown linear behavior. And maximum lateral load, maximum lateral displacement, and maximum bending moment at pile head obtained from the numerical analysis are 8∼12.4tonf, 9∼10.1mm, and 10.39∼12.67tonf-m per pile according to the curves, respectively.

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Lateral long term behavior for web direction of Driven H-Piles in Embankment (성토지반에 타입된 H 말뚝의 약축방향에 대한 횡방향 장기지지거동)

  • 박영호;정경자;김낙영;황영철
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.43-56
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    • 2002
  • To find a lateral long term behavior of driven H-piles in embankment, inclinometer is installed at pile and measurement is done during a year. When behavior of measured slope angles is in accord with behavior of nonlinear p-y curves(Reese, Murchison and O'Neil, Matlock's p-y analysis), maximum displacement of pile head, maximum stress and maximum bending moment of pile obtained from the numerical analysis are shown. As results, maximum lateral displacement at pile head, maximum stress and maximum bending moment of pile are shown linear behavior, And maximum lateral load, maximum lateral displacement, and maximum bending moment at pile obtained from the numerical analysis are 8∼12.4tonf, 9∼10.1㎜, and 10.39∼12.67tonf-m per pile according to the curves, respectively.

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Structural Analysis of Synthetic Heat Transfer Fluid Boiler (열매체보일러의 구조해석)

  • Lee, Jong-Sun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.8
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    • pp.3352-3357
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    • 2012
  • In this paper, 3-dimensional designing program CATIA was used to design in order to investigate causes of a fire in a boiler using synthetic heat transfer fluid. And also structural analysis was conducted to the boiler by using 3-dimensional finite element code, ANSYS. Maximum temperature, maximum stress, and maximum strain were obtained at the normal condition and after fire.

Advanced Maximum Power Point Tracking Method for the Series Operation Strategy of Grid-Connected Small Wind Turbines (계통연계형 소형풍력발전 시스템의 직렬운전을 고려한 개선된 MPPT 방법)

  • Kim, Yong-Hyu;Heo, Hong-Jun;Kim, Jang-Mok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.6
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    • pp.497-505
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    • 2016
  • Operating wind turbine generators at maximum power point requires maximum power point tracking (MPPT) control methods. However, conventional methods cannot track the appropriate maximum power point in situations involving wind turbine systems based on a series operation strategy. These systems comprise one or more local maximum power points, and conventional methods can detect only one local maximum power point closed by a current operation point. This study proposes an advanced MPPT method for the series operation strategy of a small, grid-connected wind turbine system. In determining the appropriate maximum point, operations at certain local maximum power points are analyzed. The results show one appropriate point, which is tracked by the proposed MPPT method. The effectiveness of the proposed method is verified by the experimental results.