• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2008.11a
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• pp.102-103
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• 2008

EHD(Electrohydrodynamics, 전기수력학)를 기반으로 한 정전기장 유도 잉크젯(또는 EHD jet) 헤드는 적층, 식각 작업 등의 일련의 과정을 생략하게 해줌으로써 마이크로 단위의 패 터닝 작업을 용이하게 해주고, 대기압 플라즈마 발생장치를 이용한 표면의 개질은 친수성 특성을 갖는 표면을 소수성 특성을 갖도록 변형시켜 주어 접촉각을 높임으로써 패턴의 크기를 줄여주는 효과가 있다. 본 연구에서, 대기압 플라즈마 발생 장치를 이용하여 유리의 표면을 소수성 특성을 갖도록 개질하여 정전기장 유도 잉크젯 헤드 장치를 이용한 패터닝 작업시, 패턴의 크기를 대폭 감소시키는 효과를 얻을 수 있었다.

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 1995.03a
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• pp.27-40
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• 1995

한강하저의 지질은 수많은 대ㆍ소 단층들로 인해 심하게 교란되어 있어 지질상황의 변화가 매우 심하며, 터널을 굴착함에 있어 지하수의 유입을 차단하는 것이 안전시공을 위한 필수 과제로 직면한다. 본 고에서는 기 시공실적을 바탕으로 암반상태에 따른 차수그라우딩의 패턴을 비교ㆍ검토하였다. 본 구간에서는 암반상태에 따라 5가지 패턴이 적용되었으며, 경암 암반일 경우는 상부반단면만을 주입범위(주입범위 : 3.5m, 28공)로 하고 암반의 전단강도증진을 위해 강관보강을 시행하였다. 연암 암반 내지 파쇄대가 부분적으로 협재된 경우는 상부반단면만을 주입하되 주입범위 및 그라우팅 공수를 늘리는 방식(주입범위 : 5∼7, 42∼56공)으로 보강하였다. 풍화암 암반의 경우는 전단면을 주입범위로 하여 그라우팅 공수를 늘림(주입범위 : 7m, 81공)으로서 차수효과를 증진시켰다. 또한 본 공사구간 중 가장 난제였던 연약지반대(잔류토 내지 풍화토) 85m 구간은 자문회의 등을 거쳐 주입범위, 주입길이 및 주입공수, bulk head 구간을 늘려 시공하고, 굴착하면서 차수효과를 확인하는 방식을 취하였다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2012.05a
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• pp.157-158
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• 2012

최근 연잎의 표면과 같은 자기세정효과의 인공적인 제작을 위한 연구가 다방면으로 진행되고 있다. 이러한 자기세정효과는 초소수성 표면 제작 및 젖음 특성 분석을 통해 형성 및 해석이 가능하다. 본 연구에서는 나노임프린트 리소그래피 공정 및 수열합성법을 이용하여 주기적으로 배열된 계층구조의 $TiO_2$ 패턴을 형성 및 표면 개질을 통한 초소수성 구현하였다. 그 결과, 표면 개질된 계층구조의 $TiO_2$ 패턴은 deionized water에 대해 $160^{\circ}$ 이상의 정적 접촉각을 갖는 초소수성 표면을 형성하였다.

• The KIPS Transactions:PartD
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• v.9D no.5
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• pp.847-858
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• 2002

A purpose of the object-oriented programming is to promote reuse and development time, and to improve software quality. A way for this purpose is using a design information well-defined and tested in previous time when developing software. Such design information is called design patterns. The design patterns are descriptions of abstract solution to recurse software design problems In a systematic and general way. But because the design patterns are descriptions of abstract solution, the specification and application of patterns generally rely on manual implementation and is applied to various forms. As a result, we need to spend a lot of time to develop software program not only because of difficulty in analyzing and applying to patterns consistently, but also because of the frequent programing faults. And because the applied design patterns don't express inside application visually, it is difficult to analyze and test for this design patterns. In this paper, we propose automatic source code generating technique to be able to efficiently apply the element of design patterns when developing application. And we show a way to analyze and use the applied design patterns in application. As a result, the design patterns in application provide the consistent structure and efficiency, and make analysis and using effect increased.

• Science of Emotion and Sensibility
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• v.17 no.1
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• pp.71-78
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• 2014

We propose the sentiment pattern as a novel sentiment feature for more accurate text sentiment analysis, and introduce the rating inference of movie reviews using it. The text sentiment analysis is a task that recognizes and classifies sentiment of text whether it is positive or negative. For that purpose, the sentiment feature is used, which includes sentiment words and phrase pattern that have specific sentiment like positive or negative. The previous researches for the sentiment analysis, however, have a limit to understand accurately total sentiment of either a sentence or text because they consider the sentiment of sentiment words and phrase patterns independently. Therefore, we propose the sentiment pattern that is defined by arranging semantically all sentiment in a sentence, and use them as a new sentiment feature for the rating inference that is one of the detail subjects of the sentiment analysis. In order to verify the effect of proposed sentiment pattern, we conducted experiments of rating inference. Ratings of test reviews is inferred by using a probabilistic method with sentiment features including sentiment patterns extracted from training reviews. As a result, it is shown that the result of rating inference with sentiment patterns are more accurate than that without sentiment patterns.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.29 no.3
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• pp.139-146
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• 2017

In order to understand the efficacy of submerged breakwater constructed for the beach protection, laboratory experiments were carried out by observing the characteristics of flow around a single shore-parallel submerged breakwater. The velocity field near the shoreline was measured by utilizing the LSPIV (Large-Scale Particle Image Velocimetry) technique, and mean surface and wave height distributions were observed around the submerged breakwater, according to various combinations of incident waves and submerged breakwaters. In this experiment, it was found that the mean flow pattern behind the submerged breakwater was determined by the balance among the gradients of mean water surface and excess wave-momentum flux (i.e., radiation stress tensors) which interact with the wave-induced current developed by the gradients on the rear and the side of the submerged breakwater. The divergent and convergent flow patterns behind the submerged breakwater (i.e., accretion and erosion response) of the numerical study of Ranasinghe et al.(2010) were observed in the measured velocity distributions, and their empirical formula mostly agreed with the experimental results. However, for some cases in this experiment, it was difficult to say that the flow pattern was one of them and was agreed with the empirical formula.

• Journal of Internet Computing and Services
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• v.11 no.5
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• pp.27-35
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• 2010

In this paper, we propose a method that can compensate the geometric distortions of image caused from an arbitrary nonflat display surface(or wall) under the environment of portable overhead projector without a flat screen. In the proposed method, we first project a grid pattern to an arbitrary nonflat display surface and then derive an equation of straight line that represents the geometry relationship between the distorted grid pattern and the original grid pattern. Next, after determining the proper size of the original grid pattern according to the form of the display surface, we generate a compensation pattern from the derived equation of straight line, which can symmetrically compensate for the distorted image. Finally, we compensate for the geometric distortions of the projected image by segmenting the real image to be projected from portable overhead projector and prewarping it according to the compensation pattern. To evaluate the proposed method, we performed experiments of image compensation on inclined surface, bent surface and curved surface that are frequently occurred in the environment of portable overhead projector without a flat screen. From the experimental results, we found that the proposed method could be very effective in compensating for the general types of the geometric distortions of the projected images.

• Environmental and Resource Economics Review
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• v.3 no.2
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• pp.389-414
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• 1994

• Proceedings of the Materials Research Society of Korea Conference
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• 1999.05a
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• pp.29-29
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• 1999

• Proceedings of the Korean Institute of Landscape Architecture Conference
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• 2015.11a
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• pp.41-42
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• 2015