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박우상 ( Woo Sang Park ),김상훈 ( Sang Hun Kim ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.4
In this study, we conducted whole effluent toxicity (WET) proficiency testing based on the results which EC50 value of 3 types (A, B, C) unknown samples calculated from 32 water quality measurement agencies in Korea. WET proficiency testing was expected to their improve of analysis skill and ensure reliability of analysis results. Ultimately, it is intended to promote the reliable enforcement of WET. WET proficiency testing was evaluated using the z-score, robust z-score and the results showed that 30 participating agencies were “compliance”. In addition, EC50 values of “unknown sample A” were the normal distribution. Therefore, “unknown sample A” was considered as the most suitable standard toxicity substance.
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Weak Anchoring 에너지를 고려한 TN-LCD의 Simulation
정진택,박우상,Jung, Jin-Taek,Park, Woo-Sang 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.11
In this thesis, an anchoring energy in the upper and lower substrates of TFT-LCD cell has been modeled and applied in the numerical calculation of the molecular orientation of the TN-LCD. The molecular orientation of liquid crystals defined as tilt and twist angles was simulated using the Newton-Raphson method and the Gaussian integration method. From the results, the tilt and twist angles for the strong anchoring energy were proven to be coincide with those of the conventional results. on the other hand, for the weak anchoring energy, azimuth angles of the molecules were changed abruptly from $0^{\circ}\;to\;90^{\circ}$ near the middle area of the cell due to the balance of the anchoring energy and the elastic energy of the liquid crystals.
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TFT-LCD의 3차원 영상출력을 위한 렌티큘러 렌즈 최적설계
김일주,박우상,Kim, Il-Joo,Park, Woo-Sang 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.3
In this study, we have researched the optimum design method of the lenticular lens sheet for 3D displays on a TFT-LCD panel, to offer a more stable stereoscopic image, improved 3D quality, and a wider viewing zone. Especially, we have defined the viewing zone width (a parameter denoted as Z) to apply it to the optimum design. The results of this new design method have been compared with the existing design method. As a result, it is revealed that the proposed design method improves the stereoscopic image quality by reducing the black matrix zone width.
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김훈,박우상,Kim Hoon,Park Woo-Sang 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.3
In this paper, We coupled fluid balance and director balance equation from Ericksen-Leslie's continuum theory and observed the motion of Liquid Crystal molecular. We simulated flow velocity and director distribution in which flow effect is considered in switching on and switching off state. We interpreted the dynamic response characteristic caused by the flow. As the result of the simulation, We could see the flow effect. In the case of Twisted Nematic(TN) cell, this flow caused abnormal twist temporarily in switching off state. We could prove that this abnormal twist is a direct cause of optical bounce phenomenon known well until now with the result of simulation. In addition, We analyzed the mechanism of the fast response due to flow in the case of Optically Compensated Bend(OCB) cell.
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FFS모드의 투과율 향상을 위한 새로운 화소전극 구조제안
이원준,박우상,Lee, Won-Jun,Park, Woo-Sang 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.11
In this study, we propose a new pixel edge shape of the fringe field switching(FFS) mode which ensures more stable movement of liquid crystal molecules and higher transmittance at the edge part. the electro optical properties were calculated 3-dimensionally using by commercially available "Techwiz LCD". From the simulation results, we showed that the dynamic stability of liquid crystal molecules was obtained in a new pixel structure. We also revealed that the transmittance of the new pixel structure increased more than 6 % compared to that of the conventional pixel structure.
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