• Journal of Advanced Marine Engineering and Technology
• /
• 제32권6호
• /
• pp.964-973
• /
• 2008

In this study, a short-wavelength coplanar-type transmission line employing periodic ground structure (PGS) was developed for application to miniaturized on-chip passive component on Si Radio Frequency Integrated Circuit (RFIC). The transmission line employing PGS showed shorter wavelength and lower characteristic impedance than conventional coplanar-type transmission line. The wavelength of the transmission line employing PGS structure was 57 % of the conventional coplanar-type transmission line on Si substrate. Using the theoretical analysis. basic characteristics of the transmission line employing PGS (e.g., bandwidth. loss, impedance, and resonance characteristics) were also investigated in order to evaluate its suitability for application to a development of miniaturized passive on-chip components on silicon RFIC. According to the results. the bandwidth of the transmission line employing PGS was more than 895 GHz as long as T is less than 20${\mu}m$, and the resonance characteristic was observed in 1239 GHz, which indicates that the PPGM structure is a promising candidate for application to a development of miniaturized on-chip passive components on Si RFIC.

• 센서학회지
• /
• 제20권3호
• /
• pp.178-186
• /
• 2011

Line tracking is a well defined method of mobile robot navigation. It is simple in concept, technically easy to implement, and already employed in many industrial sites. Among several different line tracking methods, magnetic sensing is widely used in practice. In comparison, vision-based tracking is less popular due mainly to its sensitivity to surrounding conditions such as brightness and floor characteristics although vision is the most powerful robotic sensing capability. In this paper, a vision-based robust path line detection technique is proposed for the navigation of a mobile robot assuming uncontrollable surrounding conditions. The technique proposed has four processing steps; color space transformation, pixel-level line sensing, block-level line sensing, and robot navigation control. This technique effectively uses hue and saturation color values in the line sensing so to be insensitive to the brightness variation. Line finding in block-level makes not only the technique immune from the error of line pixel detection but also the robot control easy. The proposed technique was tested with a real mobile robot and proved its effectiveness.

• 한국의류학회지
• /
• 제28권3_4호
• /
• pp.396-402
• /
• 2004

The purpose of this study was to investigate the difference of cotton fabric texture perceived between on-line(screening fabric) and off-line(real fabric), and to analyze fabric characteristics having an effect on the difference. The similarity of 55 various cotton fabrics perceived between on-line and on-line were measured showing simultaneously real fabrics and screening fabrics by 7-scale questionnaire. And the characteristics of cotton fabrics such as weave structure, thickness, weight, fabric density, stiffness, Hunter's L, a, b, and hue were measured. Cotton fabrics were classified into 3 groups by extent of similarity. There were no significant differences in weft density, stiffness, Hunter's L, a, b, and hue among 3 groups. But there were significant differences in weave structure, thickness, weight, warp density, and difference of warp ＆ weft density. The fabrics having large similarity were thick and heavy, had small warp density and difference of warp ＆ weft density, and distinct surface texture. The group having medium similarity included fabrics of medium thickness and weight, having weak surface texture, large warp density and difference of warp ＆ weft density. The group having small similarity, which the differences between on-line and off-line were large, included thin and light fabrics having smooth surface and large warp density and difference of warp ＆ weft density.

• 한국도로학회논문집
• /
• 제17권3호
• /
• pp.59-68
• /
• 2015

PURPOSES : This study suggests the application of glow line marking technology for reducing traffic accidents at nighttime. METHODS : In this study, using a statistical analysis, we analyzed the characteristics of traffic accidents occurring at nighttime. Next, the strength, weakness, opportunity, and threat (SWOT) factors were derived based on a current-status analysis of glow line marking technology and road environments. An SO strategy, ST strategy, WO strategy, and WT strategy were established in accordance with the four SWOT factors. RESULTS : This study suggests that the following strategies should be promoted to apply glow line marking technology to a road environment: 1) an activation strategy for the technological development of glow line markings for a new paradigm in reducing traffic accidents, 2) a benefit enhancement strategy applying glow line marking technology in places where nighttime traffic accidents frequently occur, 3) a strategy for the expansion of glow line marking by replacing streetlights, and 4) a strategy for enhancing road applications through the development of various line marking methods in consideration of both performance and costs. CONCLUSIONS : The application of glow line markings in a road environment can contribute to a reduction of traffic accidents at nighttime, and aid energy savings from the replacement of streetlights.

• 전기학회논문지
• /
• 제65권5호
• /
• pp.873-877
• /
• 2016

This paper proposed the structure that applied superconductors to the neutral line of a transformer and applied the normal conductors to the third line. The superconductor applied to the neutral line of a transformer limited the peak value of initial fault current, while the normal conductor finally limited the fault current. In order to secure the operating reliability of transformer type Superconducting Fault Current Limiter (SFCL) of previously proposed structure, we analyzed the operating characteristics according to the fault types. We tested a line-to-ground fault and a line-to-line fault. As a result of the experiment, all the faults showed that the superconductor stably limited the peak-value of initial fault current. Also, the normal conductor finally limited the fault current. Based on this research results, We thought that if the structure of inserting superconductor into the neutral line is applied to the real system, it could improve the reliability and stability of the power system.

• 한국전기전자재료학회논문지
• /
• 제17권6호
• /
• pp.622-632
• /
• 2004

We have studied how liquid crystal's rubbing direction and voltage driving method affect generation of disclination line. At first, generation of disclination line in vertical alignment(VA) cell and VA-twisted nematic(TN) cell has been examined. When liquid crystal's rubbing direction of bottom substrate was 0$^{\circ}$, the degree of generated disclination line was the smallest value. Further, the generation of disclination line above the electrode is less in the frame inversion than in the line inversion. Secondly, we have examined a generation of disclination line in reflective fringe-field switching cell. When the distance between common electrodes is over 3 ${\mu}{\textrm}{m}$ with on-state of one pixel and off-state of neighboring pixels, the reflectance appears only on-state pixel without generating reflectance in adjacent pixels.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
• /
• 제8권3호
• /
• pp.295-302
• /
• 2002

이 논문에서는 전자화폐 시스템 사용의 기술적인 문제점에 관한 몇가지 해결방안을 제안한다. 그 해결책은 온/오프 라인 겸용 전자화폐, 원카드, 주문형 시스템, 카드 대 카드 이체 시스템 등이다. 이 대안들이 엔젤플러스 전자화폐 사례에서 소스코드로 기술되었다. 전자화폐는 IC형과 네트워크형으로 분류 한다. 그러나 그들은 통합되어야 한다 최종사용자는 편리성을 위하여 겸용으로 사용되기를 원한다. 이 논문에서는 사례연구에 의하여 온/오프 라인 겸용 전자화폐를 개발한다. 이 논문을 바탕으로 미래연구에서는 소비자지향의 다양한 기능을 소유한 전자화폐 개발이 진행되어야 할 것이다.

• 한국소음진동공학회논문집
• /
• 제22권10호
• /
• pp.925-931
• /
• 2012

The air-conditioner for railway vehicle should have vibration durability in order to operate normally in vehicle running situation. KS R 9144(vibration test methods for railway vehicle parts) is used to verify the vibration durability. The specifications of compressor, condenser and evaporator for air-conditioner in railway vehicle are standardized, but the shape and structure of pipe lines are not specified. Because the air-conditioner handler produces the pipe line arbitrarily, sometimes the pipe line is broken during the vibration durability test. In this research the cause identification and solution of pipe line breaking problem in during the vibration durability test were studied for air-conditioner of railway vehicle(diesel multiple unit). It was found that the natural frequency of pipe line is related to the pipe line breaking by experiment. A new pipe line shape was introduced by using FEA in order to avoid the resonance. The prototype new pipe line was applied to air-conditioner and the natural frequency was measured by experiment in order to verify the resonance avoidance. The vibration reduction of air-conditioner with new pipe line was reviewed by comparing to the air-conditioner with original one.

• Wind and Structures
• /
• 제34권4호
• /
• pp.335-353
• /
• 2022

The current work numerically investigates the transient force and dynamic response of an overhead transmission tower-line structure caused by the passage of a high-speed train (HST). Taking the CRH2C HST and an overhead transmission tower-line structure as the research objects, both an HST-transmission line fluid numerical model and a transmission tower-line structure finite element model are established and validated through comparison with experimental and theoretical data. The transient force and typical dynamic response of the overhead transmission tower-line structure due to HST-induced wind are analyzed. The results show that when the train passes through the overhead transmission tower-line structure, the extreme force on the transmission line is related to the train speed with a significant quadratic function relationship. Once the relative distance from the track is more than 15 m, the train-induced force is small enough to be ignored. The extreme value of the mid-span dynamic response of the transmission line is related to the train speed and span length with a significant linear functional relationship.

• 만화애니메이션 연구
• /
• 통권31호
• /
• pp.153-176
• /
• 2013

20세기 초 미래주의 화가 중 일부는 2차원 그림에 '속도감'과 '역동성'을 표현하고자 시도하였다. 그림 속 이미지가 움직이는 것처럼 보이도록 하기 위한 속도감과 역동성의 표현은 다양한 시각적 기호로 발전하였다. 이러한 움직임을 나타내는 시각적 기호는 만화에서 중요한 운동표현의 선으로 정착하였다. 세계적으로 인기를 얻은 토리야마 아키라의 <드래곤볼>은 속도감과 역동성이 강조되어 있는 액션장르의 만화로써, 운동표현에 관한 선을 연구하기에 좋은 작품이다. <한국만화영상진흥원>의 용어사전과 <만화 애니메이션 사전>에는 운동표현에 관한 선으로 속도선, 동작선, 효과선의 세 용어가 있지만 문맥적으로 의미가 유사해서 구분해 사용하기에는 쉽지 않은 면이 있다. 본 연구에서는 <드래곤볼>의 운동표현에 관한 선을 연구하기위해 기존의 운동표현에 관한 선의 의미상 문제점을 밝히고 새로운 대안을 제시하고자 하였다. 본 연구에서 운동표현에 관한 선을 기호적인 관점에서 분류하고 쓰임에 맞추어 새롭게 정의하고자 하였으며, 기존의 속도선, 동작선, 효과선에서 잔상선을 추가하여 네 가지 선으로 분류하였다. 첫 번째, 속도선은 '움직이는 대상의 운동표현을 속도성의 개념으로 표현한 선'으로 정의하였다. 표현함에 있어서 속도선이 대상의 형태와 결합했을 때는 직접속도선, 대상의 배경과 결합했을 때는 간접속도선으로 세분하였다. 두 번째, 동작선은 '움직이는 대상의 이동형태나 이동경로를 단순화시킨 선'으로 정의하였다. 세 번째, 효과선은 '움직이는 대상의 운동표현을 감각적 표현 혹은 감정적 표현으로 강조하는 선'으로 정의하였다. 네 번째, 잔상선은 '느리게 움직이거나 흔들리는 대상의 운동표현을 잔상효과로 표현한 선'으로 정의하였다. 본 연구에서 제시한 용어는 <드래곤볼>의 운동표현에 관한 선의 이해를 도울 수 있을 것이다.