• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.524-529
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• 2002

In this paper, we report the development of two DEM (digital elevation model) generation algorithms over urban areas from an IKONOS stereo pair. One ("EpiMatch") is originally developed for SPOT images and modified for IKONOS images. It uses epipolar geometry for accurate DEM generation. The other is based on graph-cut algorithm in 3D voxel space. This algorithm is believed to work better on height discontinuities than EpiMatch. An IKONOS image pair over Taejon city area was used for tests. Using ground control points obtained from differential GPS, camera model was set up and stereo matching applied. As a result, two DEMs over urban areas were produced. Within a DEM from EpiMatch small houses appear as small "cloudy" patches and large apartment and industrial buildings are visually identifiable. Within the DEM from graph-cut we could achieve better height information on building boundaries. The results show that both algorithms can generate DEMs from IKONOS images although more research is required on handling height discontinuities (for "EpiMatch") and on faster computation (for "Graph-cut").

• 디지털융복합연구
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• 제16권5호
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• pp.419-424
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• 2018

매치 컷(Match cut)은 영상미디어에서 활발히 사용되는 몽타주(montage) 기법이다. 이 기법은 활용의 범위가 넓고, 수용자에게 다양한 의미작용을 일으키는 기법이기도 하다. 본고에서는 쇼트와 쇼트 사이에 발생되는 의미작용에 바탕을 두고, 매치 컷 활용이 다양하게 표현되는 영화 <드라큘라>을 분석하였다. 매치 컷을 통한 오브젝트들의 결합방법과 도출되는 표현은 본문에서 살펴보았듯이 결합의 방법에 따라 발생되는 표현효과가 다르게 나타났고, 그 활용의 정도는 한정적이 않음을 알 수 있었다. 본고는 영화<드라큘라>에서 드러나는 매치 컷의 활용방법을 분석하고, 그 쓰임과 표현에 있어 매치 컷 표현의 역량을 제시하고자 하였다. 또, 앞의 과정에서 발생되는 생성역량을 중심으로 질 들뢰즈(Gilles Deleuze)의 철학적 쟁점에 바탕을 두었다. 그리고 이해를 돕기 위해 비슷한 의미작용이 드러나는 프란시스 베이컨(Francis Bacon)의 회화 작품 <회화(painting)>(1946)와 <자화상(self-portrait)>(1969)과 비교분석하였다. 이 두 미디어를 분석함으로써 쇼트와 쇼트사이에 유목(nomadism)적 방법으로 '오브젝트와 오브젝트', '색과 색'등을 통해, 결합 생성으로 발생되는 '되기(becoming)'의 의미작용이 다양하게 적용될 수 있음을 알았다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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• pp.1033-1037
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• 1997

In the end milling process, the information of axial and depths of cut plays an important role in adaptive control systems for precision machining and tool monitoring systems for unmanned machining. In general, it is not easy to know the depths of cut due to irregular shape of workpieces, inaccurate positioning of them on the table of machine tool and machining error in previous cutting. In addition to, even they are informed, it is difficult to match the individual position of the cutter on the varying shape of the work material. This work suggest an algorithm estimating the depths of cut based on cutting force sigal. The proposed algorithm can be applied in more extensive cutting situations, for example, presence of the tool wear, variation of work material hardness, etc.

• 디지털콘텐츠학회 논문지
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• 제18권1호
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• pp.55-62
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• 2017

본 연구의 배경은 고사양 스마트 기기를 기반으로 모바일 게임의 장르가 다양해지면서 컷신(cut-scene)의 활용도가 높아지고 있는데, 디지털 게임에서 컷신은 불필요한 존재로 인식되고 있어 이에 컷신의 기능과 활용 범위에 대한 제안을 하고자 한다. 본 연구의 범위는 상용화 되고 있는 모바일 게임의 장르별로 컷신의 활용범위를 분류하고 시각 표현에 대한 특징을 찾아 모바일 게임의 커뮤니케이션 양식의 틀을 만들기 위한 연구이다. 연구결과는 모바일 게임의 컷신의 활용은 기존 디지털 게임과 같이 게임의 장르에 따라 다르게 나타나고 있으며, 플랫폼의 형식에 맞게 진화하고 있지만 아직은 초기 디지털 게임의 컷신과 같이 다양한 시도가 이루어지지 못하고 있다. 향후 연구 과제는 모바일 게임 플랫폼의 특성에 맞는 커뮤니케이션 양식으로 새로운 플랫폼의 등장에 적용할 수 있는 모듈이 필요할 것이라 생각된다.

• 한국정밀공학회지
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• 제15권2호
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• pp.114-123
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• 1998

In the end milling process, the information of the surface errors plays an important role in adaptive control systems for precision machining. As the measuring accuracy of the surface errors directly matches the control's, it is an important factor for evaluating the performance of the system. In order to obtain the surface errors, the prediction using the cutting force, torque, motor power etc. is frequently practiced owing to the easiness in measurement. In the implementation of the prediction, the information on the cutting depths make it concrete and precise. Actually the axial depth of cut limits the range of the calculation. In general, it is not easy to know the cutting depths due to irregular shape of workpieces, inaccurate positioning of them on the table of machine tool, and machining error in the previous cutting. In addition to, even if cutting depths are informed, it is difficult to match the individual position of the cutter on the varying shape of the work material. This work suggests an algorithm estimating the cutting depths based on cutting force and makes it precise to predict the surface error. The proposed algorithm can be applied in more extensive cutting situations, such as presence of the tool wear, change of the work material hardness, etc.

• 한국기계가공학회지
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• 제20권5호
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• pp.55-60
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• 2021

We applied an artificial neural network (ANN) and evaluated surface roughness prediction in lateral milling using an endmill. The selected workpiece was AL6061-T4 to obtain data of surface roughness measurement based on the spindle speed, feed, and depth of cut. The Bayesian optimization algorithm was applied to the number of nodes and the learning rate of each hidden layer to optimize the neural network. Experimental results show that the neural network applied to optimize using the Expected Improvement(EI) algorithm showed the best performance. Additionally, the predicted values do not exactly match during the neural network evaluation; however, the predicted tendency does march. Moreover, it is found that the neural network can be used to predict the surface roughness in the milling of aluminum alloy.

• 복식
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• 제60권6호
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• pp.62-73
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• 2010

The purpose of this thesis is to make an effective Korean Hip Hop culture and suggest a new style direction in classifying the types of fashion styles of the Hip Hop musicians and studying their features. They are surveyed in stage costumes, hair styles, make-ups, accessaries, and total fashion styles, and then classified into Normal Hip Hop Style, Casual Hip Hop Style, Sporty Hip Hop Style, Mix & Match Hip Hop Style, and Classical Hip Hop Style. The results of the study are as follows: First, Normal Hip Hop Style is the most general and universal Hip Hop fashion type. They wear clothes in bigger sizes and exaggeratively. And also a cornrow hair style, a tattoo, and a piercing represent marked individualities. Second, Casual Hip Hop Style is more active and practical than Normal Hip Hop Style. Their blue jeans and T-shirts express more simple and polished style. And also they make variable fashion styles and hair styles such as a cornrow hair and a buzz cut. Third, Sporty Hip Hop Style is from B-boy's clothes when they do active and violent break dancing. As NBA basketball games are popular, they wear training clothes, breeches, big T-shirts, and jumpers & caps on embroidered sport team's names. Their hair style is short or natural and also they have caps or hoods to present active mood. Fourth, Mix & Match Hip Hop Style is existed variable elements in one style. The typical type of this style is jacket & blue jean. It is characterized by dress shirts, neck ties, blue jeans, sneakers, beards, and moustaches. Fifth, Classical Hip Hop Style is from African Americans. They try to express assimilated appearance of Anglo-Saxons. They wear black suits, shoes, hats, and sunglasses to represent formality and elegance. In the above results, there are variable fashion styles in one Hip Hop music genre and also fashion style is changed with musical inclination. This thesis is an important guide to produce variable and creative Hip Hop fashion styles in Korean Hip Hop culture.

• Journal of Preventive Medicine and Public Health
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• 제30권4호
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• pp.741-751
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• 1997

Measurement of blood lead (PbB) and blood zinc protoporphyrin (ZPP) are most common biological indices to identify the individual at risk for excess or the health sequences by lead exposure. Because PbB is known most important and reliable index of lead exposure, PbB is often regarded as a gold standard to detect lead exposure. But in Korea PbB is a secondary test item of detailed health check-up with positive finding of screening test in most occasion. Our lead standard requires all lead workers to take annual heath-check twice a year for investigation of their health effect due to lead exposure. Blood ZPP is one of most important index to detect high lead absorption in lead workers as a screening test. Measurement of blood ZPP is known ,well to correlate with PbB in steady state of exposure in most lead workers and is often used as a primary screening test to detect high lead absorption of lead workers with the advantage of simplicity, easiness, portability and low cost. The current cut-off criteria of blood ZPP for further detailed health check-up is $100{\mu}g/d\ell$ which is supposed to match the level of $40{\mu}g/d\ell$ of PbB according to our standard. Authors tried to investigate the validity of current criteria of cut-off level $(100{\mu}g/d\ell)$ of blood ZPP and possible another better cut-off level of it to detect the lead workers whose PbB level over $40{\mu}g/d\ell$. The subjects in our study were 212 male workers in three small scale storage battery industries. Blood ZPP, PbB and hemoglobin (Hb) were selected as the indices of lead exposure. The results were as follows. 1. The mean of blood ZPP, PbB and Hb in lead workers were $79.5{\pm}46.7{\mu}g/d\ell,\;38.7{\pm}15.1{\mu}g/d\ell,\;and\;14.8{\pm}1.2g/d\ell$, respectively. There were significant differences in blood ZPP, PbB and Hb by industry (P<0.01). 2. The percents of lead workers whose blood ZPP were above $100{\mu}g/d\ell$ in the group of work duration below 1, 1-4, 5-9 and above 10 years were 8.6%, 17.2%, 47.6%, and 50.0%, respectively. The percents of lead workers whose PbB were above $40{\mu}g/d\ell$ in those were 31.4%, 40.4%, 71.4%, and 86.4%, respectively. 3. The percents of lead workers whose PbB were below $40{\mu}g/d\ell$, $40-59{\mu}g/d\ell$ and above $60{\mu}g/d\ell$ were 54.7%, 34.9% and 10.4%, respectively. Those of lead workers whose blood ZPP were below $100{\mu}g/d\ell$, $100-149{\mu}g/d\ell$ and above $150{\mu}g/d\ell$ were 79.2%, 13.7% and 7.1%, respectively. 4. Simple linear regression of PbB on blood ZPP was statistically significant (P<0.01) and as PbB was $40{\mu}g/d\ell$, blood ZPP was $82.1{\mu}g/d\ell$. 5. While the highest sensitivity and specificity of blood ZPP test to detect lead workers with PbB eve. $40{\mu}g/d\ell$ were observed in the cut-off level of $50{\mu}g/d\ell$ and $100{\mu}g/d\ell$ of blood ZPP, respectively, the highest validity (sensitivity+specificity) of blood ZPP to detect lead workers with PbB over $40{\mu}g/d\ell$ was observed in the cut-off level of around $70{\mu}g/d\ell$ of blood ZPP. But even with optimal cut-off level of around $70{\mu}g/d\ell$ of blood ZPP, still 25.0% of false negative and 20.7% false positive lead workers were found. As the result of this study, it was suggested that reconsideration of current blood ZPP cut-off of our lead standard from $100{\mu}g/d\ell$ to somewhat lower level such as around $70{\mu}g/d\ell$ and the inclusion of PbB measurement as a primary screening test for lead workers was highly recommended for the effective prevention of lead workers.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 춘계학술대회논문집
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• pp.540-545
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• 2001

In case of small motors, coil bundle occupies a large portion of stator in view of mass and volume as well as dynamics. It is observed through modal test on the stator of an IPM BLDC (interior permanent magnet brushless direct current) motor that coil bundle wound on the stator core causes the first and second natural frequencies to decrease by about 20-30% compared with those of bare stator. Especially the third natural frequency is newly observed below 3 KHz, which is not observed on the bare stator. It is found that at the third mode the end-coil and the core vibrate out of phase in radial direction. In this paper, the stator is dynamically modeled in terms of the core and the coil bundle consisting of the end-coil and the slot coil based on the above observations for the prediction of dynamic properties. The core can easily be modeled using finite element method with its actual material properties and geometric shape. The concept of equivalent bending stiffness is used for modeling of the end-coil so that predictions may match with the measured natural frequencies for the end-coil cut out of the stator. Although the same concept can be applied to the slot coil, separation of the slot coil from the stator is impractical. Therefore, equivalent bending stiffness of the slot coil is determined through iterative comparisons with the measurements of natural frequencies of the stator with the slot coil in it.

• 한국의류산업학회지
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• 제8권4호
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• pp.413-419
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• 2006

This study was performed to analyze the wearing practice and the purchasing characteristics of jeans in order to offer basic data to produce superior jeans made of denim with small flexibility and to improve the wearing comfort. The questionnaire were 236 Korean women from the age of 10th to 50th. For data analysis, descriptive analysis and crosstabs were used. The results were as follows, in the purchasing characteristics, when the women of 10th to 30th decided to purchase jeans they considered fashion, design and price rather than wearing comfort. But the women of 40th to 50th considered that wearing comfort is the most important factor. The 10th is found the best preferred jean is wide straight style, the 20th is straight style, the 30th is boots cut style and the 40th to 50th is straight style. In wearing practice, there was a difference among age groups on the region that felt uncomfortable when wearing jeans. As the age increases, the abdomen size also increases. Most people answered that they mend jeans after purchase for length, without any relation with age. The reason why consumers prefer jeans with middle length between the crotch and waist and also purchase jeans with a short length is because they look refined and neat. This informs us that the short length between the crotch and waist does not match with ease and comfort, which are the images of jeans in the past. Recently premium jean brands are competing to show Low Rise Jeans, which seems like a Premium Jean=Low Rise Jean formula is created. Some manufacture companies are recklessly copying foreign designs that does not fit Korean's body shape. However, as mentioned in this study results, there is a clear difference between designs that they think consider as aesthetic and functional. Therefore, it is considered necessary for developing designs for jeans that can satisfy both aesthetic appreciation and functions for Korean consumer's body shape and each age group.