• 공업화학
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• 제16권6호
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• pp.749-754
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• 2005

이성분 methanol/3-methyl-1-butanol계에 대하여 정온하 즉 50, 55 60, 65 및 $70^{\circ}C$에서의 기-액평형치를 측정하고, 그 측정치를 이용하여 기-액평형치를 추산하는 추산식을 이끌어 내었다. 측정치와 추산치를 비교 검토한 결과 기상조성의 몰분율은 ${\pm}0.0007$의 오차범위 내에서 잘 일치하고, methanol/3-methyl-1-butanol계에 대한 과잉 몰부피를 측정한 결과 전체 조성범위에서 양의 편차를 나타내며 최대치는 x= 0.683에서 $0.096cm^3/mol$로 나타났다.

• 태양에너지
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• 제11권1호
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• pp.3-15
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• 1991

본 연구에서는 자연채광 설계용 천공의 조건을 (1) clear sky (2) partly cloudy sky (3) cloudy sky로 나누어서 서울지역의 수평면에 대해서 전천공조도와 함께 반원형의 띠를 이용하여 확산조도를 측정한다. 천공 상태의 분류는 프랑스의 낭뜨 측정에서의 방법을 이용하였다. 본 연구에서 제시된 자연채광 설계용 기상자료는 (1) 태양고도에 따른 수평면 조도 (2) 조도의 월변화 (3) 조도의 누적표현율 (4) 하루중의 주광 강도의 변화 (5) 특정 조도 이상을 기록한 시간수이다.

• Wind and Structures
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• 제38권4호
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• pp.245-259
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• 2024

In a tornadic wind field, the vertical velocity component in certain regions of tornadoes can be significant, forming one of the major differences between tornadic wind fields and synoptic straight-line wind fields. To better understand the wind characteristics of tornadoes and properly estimate the action of tornadoes on civil structures, it is important to ensure that all the attributes of tornadoes are captured. Although Doppler radars have been used to measure tornadic wind fields, they can only directly provide information on quasi-horizontal velocity. Therefore, lots of numerical simulations and experimental tests in previous research ignored the vertical velocity at the boundary. However, the influence of vertical velocity in tornadic wind fields is not evaluated. To address this research gap, this study is to use an approach to derive the vertical velocity component based on the horizontal velocities extracted from the radar-measured data by mass continuity. This approach will be illustrated by using the radar-measured data of Spencer Tornado as an example. The vertical velocity component is included in the initial inflow condition in the CFD simulation to assess the influence of including vertical velocity in the initial inflow condition on the entire tornadic wind field.

• 비파괴검사학회지
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• 제31권3호
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• pp.233-245
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• 2011

A new BWIM(bridge weigh-in-motion) algorithm using both measured strain and acceleration data is proposed. To consider the effects of bridge vibration on the estimation of moving loads, the dynamic governing equation is applied with the known stiffness and mass properties but damping is ignored. Dynamic displacements are computed indirectly from the measured strains using the beam theory and accelerations are measured directly by accelerometers. To convert a unit moving load to its equivalent nodal force, a transformation matrix is determined. The incompleteness in the measured responses is considered in developing the algorithm. To examine the proposed BWIM algorithm, simulation studies, laboratory experiments and field tests were carried. In the simulation study, effects of measurement noise and estimation error in the vehicle speed on the results were investigated.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2000년도 THE THIRD INTERNATIONAL CONFERENCE ON AGRICULTURAL MACHINERY ENGINEERING. V.II
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• pp.344-353
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• 2000

Recent mechatronics technology is the most appropriate high technology in the agricultural application to save repetitious labor. Cow's body parameters were measured by traditional several measurer. Image processing technology was used to measure automatically their parameters to reduce lots of labor and time. The parameters were measured form a small model cow, which is easily measured, instead to a real cow. The image processing system designed and built for this project was composed of a Pentium PC, and TV frame card two cameras which were located on side and top of model cow. 11 parameters of cow's body were measured and the error between real data and the data by image processing was less than 10%. Based on the results of this research the parameters of a real cow could be measured in the future.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.718-722
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• 2014

A method for estimating the cylindrical shape of a sound radiator is presented. It assumes that sound field can be measured by a linear array. A sound field, due to the radiator vibrating with uniform velocity, can be determined by its shape, size, and orientations. Measured data also can be varying from the array's position. To predict the shape of radiators from these measured data, mathematical relation between geometric parameter and measured information is needed. Assume that a radiator is cylinder, the magnitude and phase of measured pressure is related with the length and diameter of radiator, respectively. In this paper, the method for estimating length and shape of a finite cylinder by using its radiated pressure is proposed and verified through experiment.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.2015-2016
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• 2011

Detection of data cleaning bed of because method of communication uses AODV(Ad hoc On-demand Distance Vector) Zig-Bee communication though communication method is important being separated by several part structurally data monitor ring do it way to understand be. Although data that detect in transmitter will get into several kinds, data of each senses is detected by 4 - 20 mA conclusively and remainder data is consisted of temperature data. That is measured in transmitter in mast baud via conversion relation to do monitorring norm of data being decided to PC mistake of measured value so that can do control between enforcement compose. Speak that can manage equipment of cleaning bed by number of persons who write if detect data detection in wide cleaning bed through Zig-Bee communication and is easy because also administration of data consists of real time.

• Journal of Biosystems Engineering
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• 제37권2호
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• pp.122-129
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• 2012

Purpose: Recent mechatronics technology is the most appropriate high technology in agricultural applications to save repetitious labor. Method: Cow's body parameters were measured by several traditional measurers. Image processing technology was used to measure automatically their parameters to reduce labor and time. The parameters were measured form a small model cow which is easily measured, instead to a real cow. The image processing system designed and built for this project was composed of a PC, grabber card, and two cameras, which are located on the side and the top of the model cow. Tests of verification had measured 10 dairy cows. Result: Nine parameters of the model cow's body were measured, and the difference between the real data and the data by image processing was less than 16.7%. Based on the results of the research, the parameters of a real cow had measured of chest depth, withers height, Pelvic arch height, body length, slope body length, chest width, hip width, thurl width, and pin bone width were compared with image processing data. Conclusions: In the Demonstration test, Result had obtained similar data of cow model experiments, and the most of errors were shown less than 5% relatively good result.

• 한국방재학회 논문집
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• 제9권6호
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• pp.111-117
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• 2009

토사유출량 산정을 위하여 국내 실무에서는 RUSLE 공식이 대부분 사용되고 있다. 그러나 이 공식의 각 매개변수에 대한 국내의 검증은 거의 이루어지지 않았다. 본 연구에서는 RUSLE 공식의 매개변수 중 강우침식능 인자에 대한 특성을 분석하였다. 강우침식능 인자는 강우의 총에너지와 30분 최대 강우의 곱으로 표현된다. 본 연구에서는 먼저 강원지역 시험유역의 토사유출량 관측자료를 활용하여 10개의 강우에너지 산정식의 특성을 검토하였으며, 총강우량, 최대 강우강도, 총 에너지, 토사유출량과의 상관관계를 분석하여 각 공식의 국내 적용성을 검토하였다. 또한 9년 동안의 10분 단위의 강우자료를 이용하여 강릉지역 30분 강우강도와 60분 강우강도의 관계를 제시하였다.

• 한국수자원학회논문집
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• 제35권6호
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• pp.693-701
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• 2002

본 연구는 보청천 하도형태의 변화를 해석하기 위해 1차원 유사이동 모형인 HEC-6 모형과 준 2차원 유사이동 모형인 GSTARS 2.1 모형을 적용하였다. GSTARS 2.1 모형에 포함된 Ackers와 White공식, Engelund와 Hanson공식 그리고 Yang공식의 세 가지 유사이송공식이 1993년부터 2000년까지의 하상재료에 대해 모의되었으며, 그 결과 Ackers와 White공식이 실측치에 근사한 것으로 나타났다. 1차원 유사이동 모형인 HEC-6모형과 GSTARS 2.1 모형과의 장기 하상변동 분석에 있어서 두 모형 모두 하천변화에 대한 전반적인 경향이 실측치의 하상변동 경향의 결과와 유사했다. 실측치와의 횡단면 변화의 비교에서 GSTARS 2.1 모형이 HEC-6모형의 모의결과보다 양호한 결과를 나타내었다.