• 반도체디스플레이기술학회지
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• 제18권3호
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• pp.100-104
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• 2019

We have investigated the feasibility of fabricating fine stripes using needle coating for potential applications in solution-processed organic light-emitting diodes (OLEDs). To this end, we have employed an aqueous poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) solution that has been widely used as a hole injection layer (HIL) of OLEDs and performed needle coatings by varying the process parameters such as the coating gap and coating speed. As expected, the stripe width is reduced with increasing coating speed. However, the central thickness of the stripe is rather increased as the coating speed increases, which is different from other coating processes such as slot-die and blade coatings. It is due to the fact that the meniscus formed between the needle tip and the substrate varies depending sensitively on the coating speed. It is also found that the stripe width and thickness are reduced with increasing coating gap. To demonstrate its applicability to OLEDs, we have fabricated a red OLED stripe and obtained light emission with the width of about 90㎛.

• 한국의상디자인학회지
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• 제16권2호
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• pp.71-80
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• 2014

The purpose of this study was to investigate consumer evaluation on visual sensibility of stripe pattern shirts for separation coloration. The experimental materials developed for this study were a set of clothing stimuli and response scales. The clothing stimuli were 27 color pictures, in which separation color(white: W, gray: G, black: B), separation width(small: S, medium: M, large: L), and combination color(magenta and yellow: MY, magenta and cyan: MC, yellow and cyan: YC) were manipulated. The subjects of this research were female in their 20s to 30s living in Seoul, Gwangju, Daegu, Busan, and Changwon. The investigation was carried out at December 2013. The data were analyzed by using SPSS program. Analysis methods were factor analysis, ANOVA, and Duncan-test. Results of this study were as follow.; The factors of visual sensibility according to separation color, separation width, and combination color consisted of four dimensions of attractiveness, appeal, individuality freshness, and grace. Separation color showed an independent effect on appeal and individuality freshness. Combination color showed an independent effect on individuality freshness. Interaction effects of separation color and separation width on appeal were found. Interaction effects of separation color and combination color on individuality freshness and grace were found. The study results are highly expected to be used as useful sources in a fashion product.

• 한국의류학회지
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• 제46권2호
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• pp.250-271
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• 2022

Traditional wedding dresses have had a high market demand in China in recent years. Traditional wedding dresses from the Tang dynasty occupy an important position among traditional Chinese dresses, and they are also favored by young women. This study was conducted to develop the rushan and qun patterns of traditional wedding dress styles from the Tang dynasty for women in their twenties in China. For this purpose, the rushan and qun patterns of Tang and Song dynasty dresses and modern traditional dresses were collected and analyzed. Additionally, the developed patterns were validated for suitability through appearance evaluations of virtual and real fittings. The following proportions of the developed patterns were proposed: H/3.3 for rushan length, H/33 for collar width, H/1.08 for total sleeve length, H/6 for sleeve width, H/8.5 for sleeve hem width, and H/1.55 for qun length. In addition, the developed patterns received high scores in the appearance evaluations of the virtual and real fittings. Therefore, the developed rushan and qun patterns are expected to have high utility in the current traditional wedding dress industry.

• 한국콘텐츠학회논문지
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• 제22권7호
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• pp.498-510
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• 2022

한글은 창제된 이후 다양한 글꼴과 만나면서 아름답고 풍부한 미감을 형성해 왔고, 문자의 형태가 주는 심리적인 기제는 정보 전달에 중요한 요인이 된다. 이에 글꼴을 형성하는 여러 요인 중에 속공간을 조사하면서 "속공간 넓이"라는 새로운 한글 글꼴 용어의 개념을 개발하고, 이를 적용한 글꼴의 변화가 가독성에 미치는 영향에 대하여 분석하였다. [실험1] 본문 중에서 한글꼴의 외부 속공간 넓이가 가독성에 어떤 영향을 미치는가에 대한 실증적 분석을 시도했다. 문단을 이루는 요인중 글자 크기, 글자의 장평, 글줄 사이, 글자 사이, 글자 모양에 의한 외부 속공간 넓이는 윤명조 110~160으로 구성되었고, 윤명조110의 속공간 넓이가 26.83%로 가장 넓게 나타났다. 이는 외부 속공간 넓이가 넓으면 가볍고, 밝고, 후퇴하는 느낌으로 나타나고 여백과 혼합되어 전체적으로 "밝은 회색 톤"을 형성하는 요인으로 작용했다. 외부 속공간 넓이가 좁으면 무겁고, 어둡고, 진출하는 느낌으로 나타나고 여백을 압도하여 전체적으로 '어두운 덩어리'를 형성하는 요인으로 작용했다. [실험2] 속공간을 구성하는 요인과 평가 지표를 도출하기 위하여 전문가 심층 인터뷰를 실시하였다. 이에 속공간 넓이는 선호도와 피로도에 영향을 주며, 이해도와 속도에 연관이 되는 복합적인 요소라고 평가했다. 본 연구는 한글꼴의 속공간에 대한 기존 연구가 부재한 현실에서 "속공간 넓이"의 개념을 이용한 가독성에 미치는 영향을 실증적으로 검토하였고, 향후 글꼴 개발에 적극적으로 활용되기를 기대한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1580-1581
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• 2011

The linear accelerator of Pohang Accelerator Laboratory(PAL) will drive a top-up mode operation in PLS-II(Pohang Light Source-II). Due to this kind of the operation mode, the electron gun is expected to have shorter life time of the cathode. Further in the PLS-II, two gate valves will be installed in front of the electron gun. The distance between the pre-bunching section and the electron gun will increase by 400 mm compared to the existing system due to the insertion of these gate valves. As a result the incident electron beam. One of the goals to improve the beam pulse width is by incorporating suitable biased voltage. In this paper, we will present test results of beam pulse width as a function of different biased voltage and focusing solenoid coil.

• 대한산업공학회지
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• 제31권4호
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• pp.334-340
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• 2005

A mouse is an important input device that is used in most of all computer works. A mouse control time prediction model was proposed in this study. Especially, the model described the time of mouse control that made a cursor to move within path constraints. The model was developed by a laboratory experiment. Cursor movement times were measured in 36 task conditions; 3 levels of path length, 3 levels of path width and 4 levels of target's width. 12 subjects participated in all conditions. The time of cursor movement with path constraints could be better explained by the combination of Fitts' law with steering law($r^2=0.947$) than by the other models; Fitts' law($r^2=0.740$), Steering law($r^2=0.633$) and Crossman's model($r^2=0.897$). The proposed model is expected to be used in menu design or computer game design.

• 동력기계공학회지
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• 제3권2호
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• pp.70-78
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• 1999

The vector controlled induction motor(I.M) with speed sensor has been widely used for variable speed drive systems. In these application fileds, speed sensorless control are expected strongly to progress reliability, simplicity and cost performance of I.M and to expand its application part. This paper describes a novel speed sensorless control method of I.M based on feedforward quick torque response control technique. Especially, this paper aimed at the realization of sensorless control in the very low speed region, The proposed method can be formulated simply from a motor circuit equation and conducted easily by detecting primary motor currents and a voltage command at every sampling time. Throughout some results of numerical simulations with the assumption of using a pulse width modulation(PWM) voltage source inverter, the validity of the method was successfully confirmed.

• 터널과지하공간
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• 제1권
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• pp.66-74
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• 1991

The block theory with stereographic projection was applied and analyzed on the tunnel section of Samcheok Coal Mine. The results were as follows ; 1) Prevail orientations of discontinuity of sandstone around the main driftway of Samcheok Coal Mine were $(327^{\circ},\;44^{\circ}),\;(13^{\circ},\;24^{\circ}),\;(204^{\circ},\;65^{\circ})$ and $(225^{\circ},\;77^{\circ})$ in dip and dip direction, respectively. 2) Movable blocks of the site were 0110, 0111, 1110(roof), 0100, 0110, 1110(right wall) and 0001, 1001, 1011(left wall). Because of the direction of tunnel, blocks of the left wall was safe. thus key blocks were those of the roof and the right wall. Maximum height of key block was larger than the width of the tunnel but 2m of the yielded zone is expected in general for 5m width tunnel. 3) It is shown that block theory is applicable to large cavern in hard rock analysis.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1747-1751
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• 2008

Electrohydrodynamic jet printing (EHDP) technique is widely used for the direct writing. However, in the existing EHDP method, the printing characteristics are affected by the printing substrate used, and the line width of the printed is determined by the geometry of the nozzle. We propose an EHDP method which is capable of (1) removing the effect from the substrate, and (2) controlling the line width through the ON/OFF control of the each nozzle in the nozzle array. Printing characteristics of our EHDP system were examined and successful ON/OFF control of the nozzle array were demonstrated. By using the proposed EHDP, it is expected that stable meniscus regardless of the substrate and different line widths even using the same nozzle can be achieved.

• 한국재난정보학회 논문집
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• 제18권1호
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• pp.73-79
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• 2022

연구목적: 건축법에 따라 설치되는 피난계단 출입구의 최소 유효 폭(90cm) 기준이 해당 층을 사용하는 전체 재실자의 피난 시간과는 어떤 관계가 있는지 피난 관점에서 알아보고자 하였다. 연구방법: 출입구 폭의 변화에 따라 재실자의 피난 시간에 어떠한 영향을 미치는지를 피난 시뮬레이션(Pathfinder)을 통하여 알아보았다. 연구결과: 출입구의 유효 폭이 최소기준 90cm보다 커지면 커질수록 피난계단으로의 피난 시간이 단축되는 것을 알 수 있었고, 더불어 출입구의 너비가 일정 크기 이상 되면 피난 시간은 더는 단축되지 않는다는 사실도 알 수 있었다. 이는 해당 층 전체 재실자의 수에 따라 피난계단 출입구의 유효 너비를 적정하게 달리 적용할 수 있다는 방증(傍證)이기도 한 것이다. 결론: 앞으로는 재실자의 피난 안전성 확보를 위해 용도별 전체 수용인원을 고려한 피난 계단 출입구 유효 폭 기준이 필요할 것으로 판단된다. 더불어 연구 및 실험을 통해 용도별 수용인원에 따른 다양한 출입구 유효 폭 기준이 만들어진다면 재실자의 피난 효율성이 크게 증대될 수 있을 것으로 기대된다.