• 한국환경보건학회:학술대회논문집
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• 한국환경보건학회 2005년도 가을학술대회
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• pp.154-159
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• 2005

The markers for Environmental Tobacco Smoke(ETS) a.e necessary to obtain, to interpretate and to provide the data of quantitative exposure assessment. The purpose of this research is to evaluate Indoor environment using the concentration of ETS and the correlations between markers(RSP, nicotine, 3-EP) and environmental conditions(smoking density, ventilation rate). The mean ACH(air change per hour) in smoking rooms showed non-compliance with ASHRAE standard value. The concentrations of RSP, 3-EP, nicotine showed log-normal distributions, and became different statistically depending on smoking condition(p<0.01). The geometric mean concentration of RSP in smoking room was 441.7 ${\mu}g/m^3$ that is far exceeded environmental standard(150 ${\mu}g/m^3$). The correlation coefficients between RSP and SI, 3-EP and SI, and Nicotine and SI were 0.67, 0.84, 0.74 respectively. The correlation coefficient between nicotine and 3-EP, Nicotine and RSP, and RSP and 3-EP were 0.76, 0.78, 0.57 respectively.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 추계학술대회
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• pp.318-318
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• 2017

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제49권6호
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• pp.380-386
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• 2000

This paper presents the mathematical modelling analysis of Brushless Synchronous Motor(BLSM). The dynamic and the steady state characteristics of BLSM are simulated and analyzed : electromagnetic torque, speed, line voltage, and current. We used mathematical modelling to model of BLSM with sinusoidal back EMF, namely the shaft transformation referencing rotor frame from a, b, c three to produce constant torque like synchronous motor. The experiment result has already similar to compare with simulation result : torque error about 7%, speed error about 5%. The validity of proposed modelling and analysis was confirmed by the experimental result.

• 한국공간구조학회:학술대회논문집
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• 한국공간구조학회 2008년도 춘계 학술발표회 논문집
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• pp.151-154
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• 2008

본 연구는 고층 구조물의 횡변위를 정량적으로 제어할 수 있는 효율적인 횡변위 제어 최적화기술을 제시하고자한다. 이를 위해 최적화 알고리즘의 정식화 과정이 제안되며 이를 바탕으로 횡변위제어 최적화 프로그램이 개발된다. 본 연구에서 제시한 횡변위 제어기술의 효용성을 검토하기 위해 130층 전단벽 코어 모델을 고려하였다.

• 한국세라믹학회:학술대회논문집
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• 한국세라믹학회 2000년도 춘계총회,특별강연,심포지움,연구발표회
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• pp.35-35
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• 2000

• 연구논문집
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• 통권27호
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• pp.141-151
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• 1997

Recently, the importance of electro-multifunction control valve which is digital control valve is increasing day after day. This is due to the demand of that the current industrial world wants the valve having simpler control circuit and higher operation reliability. It is the PWM controlled high speed electronic valve that satisfies the damands of current industrial world. But, the PWM controlled high speed electronic valve has some non-linearity characteristics like as the delay time of switching and the pressure oscillation phenomenon. These characteristics are an obstacle for the control of high speed & high efficiency in control system. Therefore, in this study, we set the studying purpose on analysis of parameter characteristics in solenoid, and on establishment of optimum design technique in high speed solenoid.

• 식품산업과 영양
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• 제12권2호
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• pp.5-6
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• 2007

• 연구논문집
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• 통권26호
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• pp.85-94
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• 1996

The purpose of this study is to bring out the optimal design factors which effect on dynamic characteristics in the design of proportional flow control valve with high response characteristics, and to verify the validity of the design factors. In this study, force feedback type flow control valve with nozzle-flapper is studied. And, the influences which fixed orifice, nozzle diameter, and maximum displacement between nozzle and flapper effect on dynamic characteristics are analyzed. We have done simulations using the optimal design factors and simulink(Matlab) as a simulation tool, and verified the validity of our simulations by means of comparison our simulation results with an experimental results of another similar valve.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2006년도 학술대회
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• pp.49-52
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• 2006

본 논문은 다시점 카메라로부터 획득된 다시점 영상을 이용하여, 영상내의 모든 화소에 대한 정확한 변이 정보를 획득하는 알고리듬을 제안한다. 제안한 방법은 정합창(measurement window)을 사용하는 화소기반 정합방법을 통해 정확한 변이 추정과 비용 함수 계산시 반복적인 계산을 줄임으로써 전체적인 수행 속도를 향상시킬 수 있다. 정확한 변이 정보를 획득하는데 있어서 가려진 영역이 많은 영향을 미친다. 또한 가려진 영역의 판단 및 처리는 2대의 카메라로는 한계가 있다. 따라서 본 논문에서는 평행식으로 구성된 5대 이상의 다시점 카메라로부터 획득된 다시점 영상을 사용함으로써 변이 정보의 신뢰도를 높이고, 가려진 영역을 처리할 수 있다. 또한 비용 함수 계산의 반복성을 이용하여 계산량을 줄임으로써 전체적인 수행시간을 줄인다. 이렇게 획득된 변이 정보는 다시점 영상의 중간시점영상 생성을 위해 사용된다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2007년도 정기 학술대회 논문집
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• pp.571-576
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• 2007

This study presents stiffness-based optimal design to control quantitatively lateral drift of frame-shear wall structures subject to seismic loads. To this end, lateral drift constraints are established by introducing approximation concept that preserves the generality of the mathematical programming and can efficiently solve large scale problems. Also, the relationships of sectional properties are established to reduce the number of design variables and resizing technique of member is developed under the 'constant-shape' assumption. Specifically, the methodology of dynamic displacement sensitivity analysis is developed to formulate the approximated lateral displacement constraints. The 12 story frame-shear wall structural models is considered to illustrate the features of dynamic stiffness-based optimal design technique proposed in this study.