• 소성∙가공
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• 제16권1호
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• pp.42-47
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• 2007

LCD-BLU is one of kernel parts of LCD and it consists of several optical sheets: LGP, light source and mold frame. The LGP of LCD-BLU is usually manufactured by etching process and forming numerous dots with $50\sim300{\mu}m$ diameter on the surface. But the surface of the etched dots of LGP is very rough due to the characteristics of the etching process during the mold fabrication, so that its light loss is high along with the dispersion of light into the surface. Accordingly, there is a limit in raising the luminance of LCD-BLU. In order to overcome the limit of current etched dot patterned LGP, optical pattern with continuous microlens was designed using optical simulation CAE. Also, a mold with continuous micro-lens was fabricated by UV-LiGA reflow process and applied to 7 inch size of navigator LCD-BLU in the present study.

• 대한기계학회논문집A
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• 제33권8호
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• pp.720-725
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• 2009

Among many kinds of parts for Liquid Crystal Display (LCD), a Back Light Unit (BLU) that changes the path of the light from light source to screen is the most important part to improve optical performances such as uniformity and average value of brightness. Up to recently, design process of BLU has been carried out by depending on the experience of design engineer. Using this approach, however, is proven that it is hard to effectively deal with difficulties in a process of the LCD development such as frequent design modifications, various design requirements, and short-term development. To cope with this situation, we applied a Process Integration and Design Optimization (PIDO) based design environment. PIDO is a software package to integrate multiple simulation processes and find a better solution using various design techniques. In this research, we found a design solution satisfying all design requirements by using the PIDO.

• 한국의류산업학회지
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• 제10권6호
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• pp.1023-1035
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• 2008

This study conducted a survey to find out dermatitis patients' preferred garment performance and their sentiment in spring/summer knitwears. SPSS 12.0 program was used for factor analysis, frequency analysis, T-test, ANOVA, and Duncan test. The result was as follows; First, in garments, patients required 'health hygiene', 'practicality in use care', 'skin contact' and 'easy movement'. Especially, 'skin contact' is an important property to be considered in patients' clothes. Second, in garment sensitivity, patients importantly considered 'modesty', 'feminine', 'boldness', 'decency', 'easy movement', 'youth', and 'simplicity'. Third, patients preferred simple and modest plain knitwear in light color with thin and soft fabric such as plain knit. And especially, dot pattern in knitwears should be avoided. Fourth, the preferred style of patients was that 'appropriately fit with suitable ease.' They also preferred 'front closed,' ; 'boat neckline' and 'V neckline'; 'raglan sleeve' and 'set-in sleeve'. For hem trim, they preferred 'rib'. Male preferred simple and plain style with round collar of 'tubular trim' and 'rib trim', while female preferred sophisticated and characteristic style with setin sleeve.

• 한국의류학회지
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• 제43권6호
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• pp.891-909
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• 2019

This study uses a documentary survey, field survey and textile's characteristics to understand the history of the Punggi Viscose Rayon. Punggi's textile industry grew as people migrated from Pyeongan Province in the 1900s. Little is known regarding early production conditions, but documents show cottage industries in the 1940s made union cloth using silk and rayon. The Punggi weaving industry peaked after the Korean War and declined in the late 1950s. Punggi rayon at that time was mainly used for lingerie or lining, with miliary or polka dot patterns. The industry regained momentum when the power loom was introduced in the 1960s. Manufacturers also started weaving union cloth with synthetic fibers and rayon. In the 1990s, jacquard looms enabled the weaving of elaborately colored and patterned textiles for outer fabric that made Punggi rayon famous. Most Punggi rayon looms have developed in the order of manual handlooms, semiautomatic looms, Jokdapgi, to power looms. Looms equipped with dobbies or jacquard devices also changed from wooden dobby looms to wooden jacquard looms and then to iron jacquard looms. Punggi Rayon currently has its own trademark and tag, but lacks specific regulations on the blending of fibers.

• 반도체디스플레이기술학회지
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• 제11권4호
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• pp.43-48
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• 2012

The screen printing method is much used in the flat panel display field including the LCD, PDP, FED, organic EL, and etc. for forming the high precision micro-pattern. Also A number of studies of screen printing method has been conducted as the method for the cost down through the improvement of productivity. Because of being the dot printing method of the cylindrical shape not being the line printing method like the existing PDP barrier rib and phosphor, the pillar arrays using the screen printing method is deposited in the hemispherical type not being cylindrical shape in the existing printing process conditions. In this paper, the parameters were set on the screen printing device in order to deposit the cross-sectional shape with the cone or trapezoid shape of the pillar in depositing the pillars used the screen printing device for vacuum glazing. The cross-sectional shape slope of the pillar according to the parameters was measured. And analysis the effect of the screen printing process conditions on the cross-sectional shape slope of pillars based upon the result of being measured. The processing conditions were drawn to minimize the cross-sectional shape slope of pillar.

• 한국게임학회 논문지
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• 제6권4호
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• pp.79-87
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• 2006

본 논문은 기계학습 기법을 이용한 게임 캐릭터를 제어하는 엔진을 설계하고 구현하는 것을 제안한다. 제안된 엔진은 실제 게임에서 상황 데이터를 추출하여 지식 데이터로 사용하므로 지능 캐릭터의 행동 패턴을 게이머들이 쉽게 인식하지 못하는 장점이 있다. 이를 위하여 상황 데이터를 추출하여 학습하는 모듈과 임의의 상황 데이터에 대하여 최적의 상황 제어를 판단하는 시험 모듈을 개발하는 것을 제안하였다. 구현된 엔진은 FEAR에 이식되고 Quake2 게임에 적용되었다. 또한 개발된 엔진의 올바른 동작과 효율성을 위하여 다양한 실험을 하였다. 실험으로부터 개발된 엔진이 올바르게 동작할 뿐만 아니라 제한된 시간 내에 효율적으로 동작함을 알 수 있었다.

• 정보학연구
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• 제5권2호
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• pp.55-67
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• 2002

본 논문에서는 학습계수를 발생한 오차에 따라서 적응적으로 갱신할 수 있는 학습알고리즘에 은닉 노드의 수를 다양하게 변화시킬 수 있는 적응 역 전파(Back Propagation) 알고리즘을 제안하였다. 제안한 알고리즘은 국소점을 벗어날 수 있는 것으로 기대되고, 수렴환경에 알맞은 은닉 노드의 수를 설정할 수 있다. 모의실험에서는 두 가지의 학습패턴을 가지고 실험하였다. 하나는 X-OR 문제에 대한 학습과 또 다른 하나는 $7{\times}5$ 도트 영문자 폰트에 에 대한 학습이다. 두 모의실험에서 국소 점으로 안주할 확률은 감소하였다. 또한, 영문자 폰트 학습에서의 신경회로망은 기존의 역 전파 알고리즘과 HNAD 알고리즘에 비하여 약 41.56%~58.28%정도 학습효율이 향상됨을 고찰하였다.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2004년도 춘계학술발표대회 논문집
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• pp.18-21
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• 2004

A GFRP based composite blade was developed for a 750kW wind energy conversion system of type class I. The blade sectional geometry was designed to have a general shell-spar structure. The load cases specified in the IEC61400-1 international specification were considered. For withstanding all relevant extreme loads, the structural analysis for the complete blade was performed using a commercial FEM code. The static load carrying capacity, buckling stability, blade tip deflection and natural frequencies at various rotational speeds were evaluated to satisfy the strength requirements in accordance with the IEC61400-1 and GL Regulations. For designing a lightweight blade, the thickness and the lay-up pattern of the skin-foam sandwich structures were optimized iteratively using the DOT program T-bolts were used for joining the blade root and the hub, which were modeled using a 3D FE volume model. In order to confirm the safety of the root connection, the static stresses of the thick root laminate and the steel. bolts were predicted by taking account of the bolt pretension and the root bending moments. The calculated stresses were compared with the material strengths.

• 대한전자공학회논문지TE
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• 제39권2호
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• pp.66-75
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• 2002

본 논문에서는 역전파 신경회로망의 학습능률을 향상시키기 위한 방법으로 발생한 오차에 따라서 학습파라미터와 은닉층의 수를 적응적으로 변경시킬 수 있는 적응 역 전파 학습알고리즘을 제안하였다. 제안한 알고리즘은 역전파 신경회로망이 국소점으로 수렴하는 문제를 해결할 수 있고 최적의 수렴환경을 만들 수 있다. 제안된 알고리즘을 평가하기 위하여 배타적 논리합, 3-패리티 및 7${\times}$5 영문자 폰트의 학습을 이용하였다. 실험결과, 기존에 제안된 알고리즘들에 비하여 국소점에 빠지게 되는 경우가 감소하였고 약 17.6%~64.7%정도 학습능률이 향상하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 추계학술대회 논문집
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• pp.432-432
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• 2007

We studied optical simulation method for ultra slim backlight system. We designed 0.7mm thickness light guide plate and combined 48 white color LEDs for 12 inch wide size TFT-LCD. We designed flat shape PMMA light guide plate with both side patterned. It have vertical prism shape on upper side and ellipse dot pattern on the other side. We targeted 4500 nit brightness and uniform emission characteristic without hot spot or dark area. At first, we designed uniform emission area with more high brightness in center area and then, debugged light entering hot spot zone and direction of outgoing light flux. Although it was designing step, we obtained good result with reverse prism optical sheet and it had good repeatability because it was based on the stamper method in injection process without laser engraving or micro groove engraving method.