• 한국정보디스플레이학회:학술대회논문집
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• 2003.07a
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• pp.241-244
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• 2003

The world largest 21.3" LTPS LCD has been successfully developed using SLS crystallization technology. Successful integration of gate circuit, transmission gate and level shifter was performed in a large area uniformly. Uniformity and high performance from high quality grains of SLS technology make it possible to come true a uniform large size LTPS TFT-LCD with half number of data driver IC's used in typical a-Si LCD. High aperture ratio of 65% was obtained using an organic inter insulating method, which lead a high brightness of 500cd/cm2.

• Journal of Korea Water Resources Association
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• v.33 no.S1
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• pp.37-47
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• 2000

The method of delays is widely used for reconstruction chaotic attractors from experimental observations. Many studies have used a fixed delay time ${\tau}_d$ as the embedding dimension m is increased, but this is not necessarily the best choice for obtaining good convergence of the correlation dimension. Recently, some researchers have suggested that it is better to fix the delay time window ${\tau}_w$ instead. Unfortunately, ${\tau}_w$ cannot be estimated using either the autocorrelation function or the mutual information, and no standard procedure for estimating ${\tau}_w$ has yet emerged. However, a new technique, called the C-C method, can be used to estimate either ${\tau}_d\;or\;{\tau}_w$. Using this method, we show that, for small data sets, fixing ${\tau}_w$, rather than ${\tau}_d$, does indeed lead to a more rapid convergence of the correlation dimension as the embedding dimension m in increased.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.1049-1052
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• 2004

In general, contrary to the CRTs with impulsive emission, liquid crystal displays have motion artifacts such as blurring. ghost image, decrease of dynamic CR(contrast ratio), and stroboscopic motion due to hold type driving method. In this paper, to improve motion picture quality of LCDs. impulsive driving method of black data insertion was applied to the OCB mode which is well known for its fast LC response time and wide viewing angle properties. Subject evaluation was carried out with CRT, TN, SIPS(Super IPS). and impulsive driving OCB. Moving picture image quality near CRT was obtained in impulsive OCB driving mode

• Magazine of the Korean Society of Agricultural Engineers
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• v.26 no.2
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• pp.85-96
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• 1984

石膏(改良劑)處理 및 用水管理方法에 依한 鹽害土壤의 除鹽效果를 分析하기 爲하여 浸出法(leaching method), 水洗法(rinsing method), 湛水法(ponding method ; 石膏混合處理 및 石膏非混合處理)에 依해서 3處理 3反復 4回連續抽出實驗이 遂行되었다. 나트륨減少量과 總鹽分減少率은 浸出法이 水洗法이나 湛水法에 比하여 더욱 效果的이었다. 石膏處理區의 除鹽率이 石膏無處理區의 除鹽率보다 比較的 높았으며 石膏處理區(에이커當 2톤 石膏處理區 및 4톤 石膏處理區) 사이에는 別差異가 없었다. 除鹽實驗後 나트륨吸着度(SAR)는 浸出法과 水洗法을 使用한 石膏處理區에서 $10(meq/l)^{1/2}$以下로 減少되었다. 連續抽出의 境遇 SAR은 水洗法을 使用한 石膏處理法에서 單位土壤깊이當 供給用水깊이의 比率($D_w/D_s$)이 3.0以上으로 될때 $10(meq/l)^{1/2}$以下로 減少되었고 浸出法을 使用한 石膏處理區에서는 $D_w/D_s$가 1.5以上일때 $10(meq/l)^{1/2}$以下로 減少되었다. 除鹽實驗後 飽和抽出液의 電氣傳導度(EC)는 全實驗區에서 4mmhos/cm以下로 減少되었다. 連續抽出의 境遇 EC는 水洗法을 使用한 石膏處理區에서 $D_w/D_s$가 3.0以上일때 4mmhos/cm以下로 減少되었고浸出法을 使用한 石膏處理區에서는 $D_w/D_s$가 1.5以上으로 될때 4mmhos/cm以下로 減少되었다. 排水가 比較的 良好한 土壤의 置換性나트륨百分率(ESP)은 除鹽實驗後 浸出法과 水洗法을 使用한 石膏處理區에서 15%以下로 減少되었고 排水가 不良한 土壤의 ESP는 水洗法을 使用한 石膏處理區에서 15%以下로 減少되었다. 나트륨吸着度, 電氣傳導度, 置換性나트륨百分率 等을 勘案하여 볼때 本鹽害土壤은 石膏處理浸出法 또는 石膏處理水洗法에 依하여 比較的 쉽게 改良될 수 있다고 判斷된다. 除鹽效果 및 改良劑費用等을 考慮하여 보면 排水가 比較적 良好한 鹽害土壤의 境遇 에이커當 2톤 石膏處理 浸出法이 效果的인 方法으로 보이며 排水가 不良한 鹽害土壤의 境遇에는 에이커當 2톤 石膏處理 水洗法이 比較的 效率的인 除鹽 方法이라고 思科된다. 排水가 不良한 鹽害土壤의 浸透率을 增加시키고 除鹽을 促進시키기 爲해서는 石膏等과 같은 改良劑의 供給이 必要한 것으로 看做되며 現場條件下에서도 表土層土壤의 除鹽을 爲해서는 石膏處理浸出法과 石膏處理水洗法이 效率的인 方法으로 期待된다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.3
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• pp.397-403
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• 2016

Generally, an electrical distribution configuration is a radial system with one-way current in a distribution management system (DMS). All feeders in a DMS have tie-switches to make radial system. Sometimes, DMS should change a tie-switch for operation. In that case, the tie-switch has to be closed first; then a switch is opened as another tie-switch in order to prevent blackout for customers. At the moment when the tie-switch is closed, distribution system is operated in a loop state, not radial. Before the loop operation, DMS operator has to check any expected events for stable distribution system operation; and the most important event is a mis-operation of a protection relay. In addition, DMS operator should check voltage profile violation but a calculation method of section voltages had not been used. Thus, this paper proposes a calculation method of section voltages at a loop operation in a DMS. The proposed calculation algorithm is verified by Matlap Simulink.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.1406-1411
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• 2005

The creep rupture data for type 316LN stainless steels were collected through literature survey or experimental data produced in KAERI. Using these data, polynomial equations for predicting creep life were obtained by Larson-Miller (L-M), Orr-Sherby-Dorn (O-S-D) and Manson-Haferd (M-H) etc. time-temperature parametric (TTP) methods. Standard error of estimate (SEE) values for the each parameter was obtained with different temperatures through the statistical process of the creep data. The results of L-M, O-S-D and M-H methods showed good creep-life prediction, but M-H method showed better agreement than L-M and O-S-D methods. Especially, it was found that SEE values of M-H method at $700^{\circ}C$ were lower than that of L-M and O-S-D methods.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.34S no.1
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• pp.65-71
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• 1997

In this paper, we propose a new .mu.-controller design method using an equivalent weighting function $W_{\mu}$(s). The proposed mehtod is not guaranteed to converge to the minimum as D-K and .mu.-K iteration method. However, the robust performance problem can be converted into an equivalent $H^{\infty}$ optimization problem of unstructured uncertainty by using an equivalent weightng function $W_{\mu}$(s). Also we can find a .mu.-optimal controller iteratively using an error index $d_{\epsilon}$ of differnce between maximum singular value and .mu.-norm. And under the condition of the same order of scaling functions, the proposed method provides the .mu.-optimal controller with the degree less than that obtained by D-K iteration..

• Proceedings of the SCSK Conference
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• 2003.09b
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• pp.407-416
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• 2003

In this study, we evaluate the correlation between in vitro and in vivo determination of SPF of sunscreen products containing various ingredients depending on emulsification system. For in vitro approach, we determined SPF by the method of Diffey and Robson using an TransporeTM tape(3M Health care, USA) and SPF 290-analyzer(Optometrics Co. USA). SPF values and standard deviations are calculated and displayed after completion of the run. In vivo SPF values are determined according to KFDA (the Korea Food and Drug Administration) method in panels of Fitzpatrick's skin type II or III. We investigated the difference in SPF data of sunscreen ingredient according to emulsification system. The in vivo SPF data is high in water-in oil(W/O) emulsion than in oil-in water(O/W) emulsion samples. The difference may be due to the particular behavior in each vehicles and its presence on skin surface may produce a different sunscreen film. We obtained the corrlation coefficient between in vitro and in vivo SPF data for O/W (R-squre=0.72 )and W/O emulsion(R-squre=0.77). From these results, we suggest the improvement of methodology using Transpore$^{TM}$ tape as substrate to increase the predictability of in vitro method.d.

• Journal of the Korean Society of Clothing and Textiles
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• v.29 no.7 s.144
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• pp.1008-1017
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• 2005

When we develop 2D pattern from replica of human body with small pieces, it is inevitable to have some replica pieces overlapped or departed. In this study, the optimized method of 2D pattern development from the 3D replica pieces was investigated using dress-form. Among six arrangement methods, anchoring two vertexes of a replica to neighboring vertexes of a next replica induces the optimized 2D pattern by evenly distributing stress across the 3D replica pieces. Anchoring neighboring vertexes resulted in automatic widening k overlapping (W & O) the interspaces among replicas of dress-form, thereby stress was distributed more evenly than any other method. W&O arrangement method was verified to be the best by examining the 3D space distribution images between body surface and twelve experimental garments.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.61-62
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• 2013