• 대한치과보철학회지
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• 제43권4호
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• pp.453-465
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• 2005

Purpose: This study was performed to measure the accuracy of adjustable dental impression trays by a scanning laser three-dimensional digitizer. Materials and methods: The metal stock, individual, and adjustable stock trays were used for 60 stone casts(10 casts each) duplicated a resin master model of mandible and maxilla. The type IV dental stone was poured in a vinyl polysiloxane impressions and allowed to set for one hour. The master model and the duplicated casts were digitized using an optical digitizer. The distance between the reference points were measured and analyzed on the graphic image of 3-D graphic software(CATIA version 5.0). The statistical significance of the differences between the groups was determined by a two-way ANOVA. Results : There were no significant differences between the accuracies of the adjustable stock tray and the master model except only anterior arch width on the upper arch and the diagonal arch length and arch length on one side of the lower arch. Conclusion: The adjustable stock trays showed clinically acceptable accuracies of the study cast produced by them.

• 대한인간공학회지
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• 제28권4호
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• pp.125-137
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• 2009

Recently, the frequency in use of electric adjustable bed is going up by an increase in the elderly population. In bad ergonomic design for an electric adjustable bed causes some problems in the aspects of usability and safety. In particular, lots of accidents came from going up or going down an electric adjustable bed. In that case, the height of bed is very important factor for preventing an accident. This problem is related to its anthropometric factors. Therefore we carried out its anthropometric analysis and old people's standing action according the height of electric adjustable bed as an experimental study. As a result, we proposed some anthropometric design criteria and identified the effect of bed height when old people use it.

• Journal of Magnetics
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• 제12권1호
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• pp.7-11
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• 2007

We confirm the validity of the analytic expression for the temperature of the Joule heated nano-wire [C.-Y. You et al. Appl. Phys. Lett. 89, 222513 (2006)] with finite element method. The temperature of the Joule heated nano-wire is essential information for the research of the current induced domain wall movement. The analytic expression includes an adjustable parameter which must be determined. Since the physical origin of the adjustable parameter is simplification of the heat source profile, the validity of the analytic expression must be examined for wide range of the nano-wire structure. By comparison with this analytic expression with the results of full numerical finite element method, the adjustable parameter has been determined. The numerically confirmed adjustable parameter values are in the range of 0.60$\sim$0.69, which is well matched with the theoretically expected one. Furthermore, it is found that the adjustable parameter is a slow varying function of the nano-wire geometry. Based on this numerical confirmation, we can apply the analytic expression for the wide range of the nano-wire geometry with proper adjustable parameters.

• 플랜트 저널
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• 제5권1호
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• pp.45-50
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• 2009

In this study, the experimental study has carried out to select pitch angle on the backward flow in an axial fan that has adjustable pitch blades. With the change of pitch angle of axial fan with adjustable blade, air flow rate, pressure and air flow direction can be changed. Because of this merit, adjustable axial fan can be used in the backward flow. For the selection of the backward flow pitch angle, fan performance test method is selected by KS B 6311. Dynamic pressure, static pressure, electric current and voltage are measured in each pitch angles of axial fan that are $36^{\circ}$, $-16^{\circ}$, $-21^{\circ}$, $-26^{\circ}$, $-31^{\circ}$ and $-36^{\circ}$. In the result of test, fan performance curves at several pitch angle has been investigated. Finally, pitch angle of $-26^{\circ}$ has been selected to get largest flow rate at backward flow situation.

• 대한전자공학회논문지
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• 제12권1호
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• pp.18-26
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• 1975

본 논문에서는 4-path 여파기로 구성된 대역폭 조정 대역통과 여파기를 실현하였으며, 그 여파기의 통과대역의 대역폭은 주파수에 의하여 조정된다. 본 여파기의 주파수 통과대역 특성은 전자결합 복합주 증폭기와 같고 통과대역의 중심주파수는 연속적으로 시킬 수 있다. 대역폭 조정의 범위는 복동주의 쌍봉특성의 경우와 단봉특성의 경우로 나누어 고찰하였다. 이 system의 진폭응답을 실측하여 대역폭 조정 이론을 뒷받침 하였으며 그 측정결과는 이론치와 잘 일치하였다. In this paper, a frequency controlled bandwidth adjustable bandpass filter consisting of 4-path system is precented. It is shown that this system has characteristics similar to ihose of the magneticuly coupled double tuned amplifier and the center frequency of the passband is able to be shifted contineolisly. The adjustable range of the bartdwidth of the filter system is anslyzed for she case of the double and single tuned characteristics. The experiment has been conducted to verify the theory of this system and the experimental resulis are in good agreement with the theoretically calculated values.

• 전자공학회논문지CI
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• 제44권1호
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• pp.10-18
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• 2007

본 논문에서는, 가변의 감지 반경을 갖는 무선 센서 네트워크에서 감지범위가 중첩되는 영역을 최소화하기 위한 노드의 위치를 결정하는 방법에 관하여 기술하였다. 최적의 노드위치를 구하기 위하여, 이웃하는 노드들과의 감지영역이 중첩되는 면적과 각 노드의 감지 반경 및 이웃하는 노드와의 전개 각도를 이용하여 최적화 식을 유도하였다. 이를 기반으로 한 새로운 가변감지영역제어 (ASRC: Adjustable Sensing Ranges Control)에 의한 노드 위치방법을 제안하였다. 제안된 방법은 기존의 조건에 의한 방법과는 달리 수학적 식에 근거하여 유도된 모델로서, 다양한 시뮬레이션을 통하여 타당성을 확인하였다.

• Journal of Oral Medicine and Pain
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• 제37권4호
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• pp.213-219
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• 2012

구강내 장치 요법은 가벼운 혹은 중간 정도의 폐쇄성 수면 무호흡증의 일차 치료법이며 심한 폐쇄성 수면 무호흡증의 경우에도 CPAP 또는 수술요법에서 효과가 없을 때 좋은 대안적 치료법이 될 수 있다. 하지만 다양한 구강내 장치들마다 치료 효과가 다르며 또한 모든 환자들에서 효과를 기대하기 어려운 것도 사실이다. 본 연구는 목젖입천장인두절제술(uvulopalatopharyngoplasty, UPPP) 을 받았으나 증상의 개선이 없는 심한 폐쇄성 수면 무호흡증 (obstructive sleep apnea, OSA) 환자에서 단국대 치대 구강내과에서 개발한 구강내 조절성 하악전방이동형 코골이 방지장치 (Adjustable Anterior Positioner, AAP)를 사용하여 치료한 증례를 보고하고 그에 대한 고찰을 한다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 동계학술발표대회 논문집
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• pp.145-150
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• 2008

In this study, the experimental study has carried out to select pitch angle on the backward flow in an axial fan that has adjustable pitch blades. With the change of pitch angle of axial fan with adjustable blade, air flow rate, pressure and air flow direction can be changed. Because of this merit, adjustable axial fan can be used in the backward flow. For the selection of the backward flow pitch angle, fan performance test method is selected by KS B 6311. Dynamic pressure, static pressure, electric current and voltage are measured in each pitch angles of axial fan that are $36^{\circ}C$, $-16^{\circ}C$, $-21^{\circ}C$, $-26^{\circ}C$, $-31^{\circ}C$ and $-36^{\circ}C$. In the result of test, fan performance curves at several pitch angle has been investigated. Finally, pitch angle of $-26^{\circ}C$ has been selected to get largest flow rate at backward flow situation.

• 한국정보통신학회논문지
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• 제10권11호
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• pp.2099-2106
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• 2006

본 논문은 가변의 감지영역을 갖는 무선 센서 네트워크에서 센서노드의 감지에너지 소비를 최소화하기 위한 노드의 위치를 결정하는 방법에 관하여 기술하였다. 감지에너지의 소비를 최소화하기 위해서는 이웃하는 노드들과의 중첩되는 감지면적이 최소화되어야 한다. 중첩영역을 최소로 하는 노드의 위치를 결정하기 위하여, 이웃하는 노드 사이의 감지영역과 전개각 및 각 노드의 감지반경을 이용하여 최적화 식을 유도하였다. 이를 기반으로 한 ASRC(adjustable sensing ranges control)에 의한 새로운 노드 위치방법을 제안하였다. 제 안한 방법은 기존의 조건에 의한 방법과는 달리 수학적 식에 근거하여 유도한 모델로서, 시뮬레이션을 통하여 감지에너지 소모에 대한 유효성을 확인하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.101-104
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• 1997

In this paper, we deal with a quadratic stabilization by $H^{\infty}$ output feedback controllers with adjustable parameters. The designed controller contains a contractive time-varying gain which can be used to adjust the responses of the resulting closed-loop system. The free parameter expressed as time-varying gain is chosen so that a Lyapunov function of the closed-loop system descends as fast as possible. A numerical example is given to show the validity of proposed method..