• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2018.06a
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• pp.34-34
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• 2018

레이저를 통한 플라스틱 일체형 회로형성 기술은 레이저 직접 성형 (Laser Direct Structuring, LDS) 기술과 도금기술을 이용하여 기판 표면에 전도성 회로 패턴을 형성하고 소자를 집적하여 부품을 제작하는 기술이다. 종래에는 PCB 기반의 평면기판을 기반으로 하여 제작된 소자와 부품이 전자제품의 주를 이루었으나, 최근 소자의 집적화와 제품 디자인의 유연화(flexible)로 굽힘(bendable) 형태의 스마트 시계와 같은 웨어러블(wearable) 전자 제품이 출시되었으며, 레이저를 통한 플라스틱 일체형 회로형성 기술은 미래 사회의 주를 이룰 웨어러블 형태의 제품의 상용화를 가능하게 할 뿐만 아니라 회로 집적이 가능하여 제품 혁신을 주도할 기술로 주목 받고 있다. 본 연구에서는 LDS 부품의 미세 회로 구현을 위한 공정 기술 개발에 있어서 고생산성 무전해 동도금액 및 부품 실장을 위한 표면처리 기술 개발에 대한 결과를 보고한다. 미세 회로 패터닝 기술의 상용화를 위해서는 도금액의 안정성뿐만 아니라 고속 공정기술이 필요하다, 현재 국내 무전해 동 도금의 석출 속도는 시간 당 $4{\sim}5{\mu}m$ 내외이기 때문에, 생산성을 향상시키기 위해서는 시간 당 $10{\mu}m$ 정도의 고속 무전해 동 도금 공정 개발 필요하다.

• Journal of Convergence for Information Technology
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• v.10 no.2
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• pp.96-101
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• 2020

In micro-sized light emitting diodes, which are increasingly attentions as the light sources of displays and semiconductor lighting, increasing the amount of light and improving the luminous efficiency are very important and various development directions and methods have been proposed. In this study, the design of 3-dimensional nano structures through nano frame formation and the application of a nano pattern and a reactive etching method were proposed. And it will also be discussed that nano pillar arrays with nano cavities having improved verticality can be applied to semiconductor light sources through the development of nano frame structures.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.11 no.4
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• pp.80-85
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• 2012

In this paper, a new planar folded UHF band RFID reader antenna is suggested. For the antenna suggested in this paper, 4 PIFA (Planar Inverted F Antenna) micro-strip structures are adopted. The size is $50mm{\times}50mm{\times}6.2mm$. The gain of the antenna is 1.1 dBi, the VSWR is 1.2:1, and the efficiency is 63.3 %. The radiation pattern is designed as upper direction. Identification distance for the RFID tags is improved by minimizing hand effects with properly integrating 4 PIFAs.

• Journal of The Korean Association For Science Education
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• v.35 no.5
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• pp.919-929
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• 2015

This study aims to develop a modeling-based learning program about geologic structures and to reveal the relationship between the argumentation patterns and levels of students' mental models. Participants included 126 second grade high school students in four sessions of modeling-based learning regarding continental drift, oceanic ridges, transform faults, and characteristics of faults. A modeling-based learning program was implemented in two classes of the experimental group, and teacher-centered traditional classes were carried out for the other students in the comparison group. Science achievement scores and the distribution of students' mental models in experimental and comparison groups were quantitatively compared. The video-taped transcripts of five teams' argumentation were qualitatively analyzed based on the analytic framework developed in the study. The analytic framework for coding students' argumentation in the modeling-based learning was composed of five components of TAP and the corresponding components containing alternative concepts. The results suggest that the frequencies of causal two-dimensional model and cubic model were high in the experimental group, while the frequencies of simple two-dimensional model and simple cross sectional model were high in the comparison group. The higher the frequency of claims, an argumentation pattern was proven successful, and the level of mental model was higher. After the rebuttal was suggested, students observed the model again and claimed again according to new data. Therefore, the model could be confirmed as having a positive impact on students' argumentation process.

• The Research Journal of the Costume Culture
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• v.17 no.5
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• pp.849-865
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• 2009

This research is a study of fashion design that applied formative features of formal beauty of architecture into clothing design; we focused on Gaudi's architectural style as well as Art Nouveau style that became popular from the end of the 19th century to the beginning of the 20th century. We noted that in general the simple and flat features of cloth impose a limitation on the expression of formal features in clothing design, but a unique diversity of designs can be achieved, evoking a sense of freshness by an ideal combination of flat patterns and draping. The aim of this research is to present a possibility of extending the sphere of design expression by creating three-dimensional clothes with pattern-cutting skills and applications of three-dimensional patterns as well as flat patterns found in Gaudi's works of architecture that are distinguished in curvaceousness and formal beauty. As for the research method, we reviewed previous studies by making a close review of books, papers, the pictures and web sites related to this topic. We made our clothes on the basis of this theoretical consideration. We found the following points. First, by presenting a work of fashion inspired by architectural designs, we realized that formal beauty in architect can become a motive for clothing design in a broad scale by noting the formal images, decoration details, and formative features of architectural works. Second, the characteristic lines of Gaudi's architecture are suitable to be adapted for expressing the detailed lines of decoration in clothes. Third, we can express formative beauty in clothes by highlighting the variation of shapes and lines through various attempts of change in background pattern, even though there is a limitation in the availability of cloth material because we must choose pieces of cloth with right texture and thickness that can be cut and sewn appropriately to express formative beauty. Fourth, we confirmed that it was possible to create unique formative designs by a creative application of both flat and three-dimensional cutting.

• Spatial Information Research
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• v.20 no.4
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• pp.1-16
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• 2012

There is no doubt that the urban heat island (UHI) is a mounting problem in built-up environments, due to energy retention by the surface materials of dense buildings, leading to increased temperatures, air pollution, and energy consumption. To investigate the UHI, three-dimensional (3-D) information is necessary to analyze complex sites, including dense building clusters. In this research, 3-D building geometry information is combined with two-dimensional (2-D) urban surface information to examine the relationship between urban characteristics and temperature. In addition, this research introduces spatial regression models to account for the spatial spillover effects of urban temperatures, and includes the following steps: (a) estimating urban temperatures, (b) developing a 3-D city model, (c) generating urban parameters, and (d) conducting statistical analyses using both Ordinary Least-Squares (OLS) and Spatial Regression Models. The results demonstrate that 3-D urban characteristics greatly affect temperatures and that neighborhood effects are critical in explaining temperature variations. Finally, the implications of the results are discussed, providing guidelines for policies to reduce the UHI.

• Journal of the Korean Home Economics Association
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• v.43 no.10 s.212
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• pp.179-190
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• 2005

The purpose of this study was to apply the three dimensional Replica method to the fabrication of dress forms of plus-sized women to attain proper ease through draping and based on the ease to develop good torso patterns with superior fit. The results were as follows. The physical characteristics of the dress forms of plus-sized women were divided into two: Types I and 11. The proper ease was calculated through draping using dummies of each somatotype and appropriate torso patterns were developed. The differences of the types for each pattern were as follows. The bust girth ease of Type II was 6cm as for Type I. As for the bust breadth 1.0cm was added to the anterior chest width, the armpit width was the actual measurement plus 0.5cm, and the back breadth was the posterior chest width plus 2.5cm. The bust breadth was smaller and the back breadth was bigger that those of Type I after improving the bust and back fit. The bust of Type I protrudes outwards relatively and so the shoulder dart of front-side of Type I was 1.2cm bigger than that of Type II which improved the bust region fit. Considering the characteristics of the protruding abdominal region the front- side waistline of type II was assigned W/4+3.5cm and the back-side waistline W/4cm, so that the sidelines divided the front and back properly. It was drafted so that the center-front became diagonal, thereby improving the middle-hip girth fit.

• Journal of Korean Society of Transportation
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• v.17 no.5
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• pp.79-86
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• 1999

Traffic jams of our country are due to the shortage of roadway as compared with the traffic, however. they are sometimes due to inconsistency of the roadway capacity. Inconsistency of the roadway capacity comes from the difference of cycle length, phase length and number of Phase between major intersection and minor intersection. Specialty increasing number of Phase due to left-turn movements bring out decrease of the arterial capacity, deterioration of the arterial offset. The Purpose of this research is to introduce and analyze the continuous flow intersection to solve the bottleneck of the major intersection. The major contents of this research introduce the concept and design consideration for the continuous flow intersection and also analyze delay, fuel consumption and emissions among multiphase intersection, grade separated intersection and continuous flow intersection. This research analyze the sensitivities according to change of the left-turn traffic volume and also evaluate the cost-effectiveness through the total cost analysis among three of them.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.1C
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• pp.36-45
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• 2006

In this paper, multiview calibration system for an effective 3D display is proposed. This system can be obtain 4-view image from multiview camera system. Also it can be rectify lens and camera distortion, error of bright and color, and it can be calibrate distortion of geometry. In this paper, we proposed the signal processing skill to calibrate the camera distortions which are able to take place from the acquisited multiview images. The discordance of the brightness and the colors are calibrated the color transform by extracting the feature point, correspondence point. And the difference of brightness is calibrated by using the differential map of brightness from each camera image. A spherical lens distortion is corrected by extracting the pattern of the multiview camera images. Finally the camera error and size among the multiview cameras is calibrated by removing the distortion. Accordingly, this proposed rectification & calibration system enable to effective 3D display and acquire natural multiview 3D image.

• Journal of the Korea Society of Computer and Information
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• v.19 no.7
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• pp.17-25
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• 2014

In the devices that leave video records, it is an important issue to distinguish whether the input image is a real object or a photo when securing an identifying image. Using a single image and sensor, which is a simple way to distinguish the target from distance measurement has many weaknesses. Thus, this paper proposes a way to distinguish a simple photo and a real object by using stereo images. It is not only measures the distance to the target, but also checks a three-dimensional effect by making the depth map of the face area. They take pictures of the photos and the real faces, and the measured value of the depth map is applied to the learning algorithm. Exactly through iterative learning to distinguish between the real faces and the photos looked for patterns. The usefulness of the proposed algorithm was verified experimentally.