• 한국컴퓨터그래픽스학회논문지
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• 제23권3호
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• pp.47-54
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• 2017

본 논문은 향상된 곡률기반 GPU 등가면 레이캐스팅 기법을 제안한다. 제안한 방법은 등가면을 계산할 때 Sigg et al. [1]이 제안한 고속연산 기법을 사용하고 미분값을 계산할 때는 드 부어 알고리즘을 사용한다. 이렇게 함으로써 추가적인 텍스쳐 읽기연산의 수를 84번에서 27번으로 줄일 수 있어, 플랫폼에 따라 편차는 있으나 결과적으로 최고 약 30%가량 성능이 향상된다.

• 한국산업보건학회지
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• 제21권4호
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• pp.185-192
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• 2011

To predict contaminant concentrations within a multi-zone work environment, an air quality model in the work environment was developed. To do this, airflow equations on the basis of orifice equation were solved by using the Conte and De Boor scheme, and then equations for the conservation of mass on contaminant were solved by using the fourth-order Runge-Kutta algorithm. To validate the accuracy of simulated results, this model was applied to the controlled environment chamber that had been tested in 1998 by Chung KC. The comparison of predicted concentrations by this study with measured concentrations by the Chung KC indicated that the average deviations were 2.66, 3.35, and 3.15% for zone 1, zone 2, and zone 3, respectively. Also, this model was applied to a working plant with four zones. Thus, the results of contaminant concentration versus time were predicted according to the schedule of the openings operation, and case studies were done for four cases of the openings operation to investigate the interaction of airflow and contaminant concentration. The results indicated that opening operation schedules had a significant effect on contaminant removal efficiency. Therefore, this model might be able to apply for the design of ventilation schedules to control contaminants optimally.