• 천문학회보
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• 제37권2호
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• pp.71.1-71.1
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• 2012

We have identified local analogs of strong $H{\alpha}$ Emitters (HAEs) that dominate the z~4 Lyman-break galaxy population using the Sloan Digital Sky Survey (SDSS). At z<0.4, only 0.04% of galaxies are classified as HAEs with $H{\alpha}$ equivalent width larger than $500{\AA}$, comparable to that of z~4 HAEs. The $H{\alpha}$-to-UV luminosity ratio of local HAEs is consistent with that of z~4 HAEs, indicating relatively large specific star formation rate in these galaxies compared to traditionally studied UV-selected Lyman break analogs. Local HAEs are young, less evolved galaxies with low metallicity. It is still difficult to constrain whether the star formation in local HAEs is powered by minor mergers or by cosmological cold gas accretion. However, the stacked optical spectrum of local HAEs shows several strong ionization lines, for example HeII 4686 emission line, which are shown in Wolf-Rayet galaxies. Thus it is highly likely that local HAEs are galaxies with an elevated ionization parameter, either due to a high electron density or large escape fraction of hydrogen ionizing photons.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 추계학술대회 논문집(I)
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• pp.484-489
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• 2002

Whenever the accidents occur in the railway areas, their prompt recovery is very important. The individual way has been used to resolve these accidents by direct visiting the site and reporting to others who cares for these cases. As a result, we are planning to operate the MTS (Moving picture Transmission System) for a timely information's transmission to the related peoples in the central control center by transforming the picture information on the accident-site to the digital information. The proposed system is not a transmission system using exclusive lines, but utilizing the existing railway computer network. We construct a network server device so that a dispatcher can easily connect with the server through the railway intranet. In some railway environments such as disturbed field situations and geographical condition(in tunnels and bridges, etc) building up the wired network is difficult. Solving this problem, we reviewed the wireless network. Finally we proposed the mixed wireless network that is able to cover the wired network. We then installed and tested the wired network and wireless network respectively in wayside of a railway field. Through the testing, we identified many detailed matters for some network construction approaches to the control room and many field device-connecting schemes. This research will contribute to minimize the number of staff dispatched to a disturbed field, decrease the accident recovery time and improve the quality of service to the passenger.

• 대한전기학회논문지:전력기술부문A
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• 제48권8호
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• pp.924-931
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• 1999

Most conventional protection relays are based on processing information in the spectrum that is close to or at power frequency. It is, however, widely known that faults on transmission lines produce frequency components of a wide range. High frequency signals caused by sudden changes in system voltage that occurs in the immediate post-fault period are generally outside the bandwidth of receptibility of most protection scheme. In this respect, a specially designed stack tuner is connected to the coupling capacitor of CVT, in order to capture the high frequency signals. Digital signal processing is then applied to the captured information to determine whether the fault is inside or outside the protected zone, and to discriminate the fault type. In this paper, modal transform is not applied to fault generated signals, because signals which are converted by modal transform are not have an information of each phase any longer. Instead, using peak voltage value of data windows is able to discriminate fault type. The paper concludes by presenting fault detection and discrimination of various faults on transmission line which are based on extensive simulation studies carried out on a typical 154kV Korean transmission line, using the EMTP software.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.1424-1426
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• 2003

It will be a real good news for the people who were lost their hometown by the construction of a large dam to be restored to the former state. Focused on Cheung-Pyung around where most part were flooded by the Chungju large Dam founded in early 1980s, we used Remote Sensing Technique in this study in order to restore topographical features before the flood with 3 dimensional effects. We gathered comparatively good satellite photos and remotely sensed digital images, then we made a new color image from these and the topographical map which had been made before the flood. This task was putting together two kinds of different timed images. And then, we generated DEM including the outskirts of that area as harmonizing current contour lines with the map. That could be a perfect 3D image of Cheung-Pyung around before when it had been flood by making perspective images from all directions, north, south, east and west, for showing there in three dimensions. Also, flying simulation we made for close visiting can bring us to experience their real space at that time.

• 대한원격탐사학회지
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• 제9권2호
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• pp.21-34
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• 1993

디지탈화된 지형 정보는 조망분석, 토목계획이나 설계, 또는 지리정보시스템등 여러 분야 에 필요한 요소가 된다. 또한 컴퓨터에 적절한 형식으로 입력된 지형정보는 모의 비행훈련이나 무인비행장치에서도 사용될 수 있다. 지형정보는 지도위에 등고선을 비롯한 여러가지 기호들로 표시되어 있어서 훈련된 요원에 의해 분석된다. 자동분석을 위해서는 컴퓨터에 입력되어야 하는 데 디지타이징 타블렛과 같은 장비를 사용하여 수동으로 입력하는 것은 많은 시간과 인력을 필요 로 한다. 본 논문에서는 이차원 지형도로부터 삼차원 지형정보를 자동적으로 추출하는 방법을 다 루고 있다. 등고선 조각연결 알고리즘을 포함하는 몇 가지 알고리즘들이 제안되었고 실제 지형도 를 사용하여 실험되었다.

• 복식문화연구
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• 제26권6호
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• pp.888-898
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• 2018

The purpose of this study was to review and establish the two concepts of art film and artistic expression in Prada fashion films, through a literature review of domestic and international case studies, as a form of luxury branded content, Prada fashion films are considered to artistic film genre. For the study, aesthetic expression in art films as discussed in the previous research was divided into four types. The study method was to review fashion / art films from the founding of YouTube, specially, works that used digital images from Thunder Perfect Mind, which was introduced in Prada in 2005, to Nylon Farm in 2018, stylistic features were searched by film. In addition, for this study, fashion film was analyzed based on the typology of art films. The following conclusions regarding artistic expression were drawn from this study : First, the Prada fashion films represent a transition to advanced art through a conceptual approach. Second, the causal relationships personality psychology can be cited through the disturbed and fragmented narrative lines. Third, the films help people identity Prada's aesthetics by humanizing the luxury brand. Fourth, the films are a feature of serialization.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2018년도 학술발표회
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• pp.30-30
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• 2018

제방 매핑 연구는 제방 안전도 측정을 위해 중요하며, 드론 영상은 실시간 제방 지도를 만들기 위해 활용될 수 있다. 본 연구에서는 하천유역을 촬영한 드론 영상을 이용하여 제방 매핑 연구를 진행하였다. 우선 테스트 베드의 하천유역을 촬영한 드론 영상을 수집한다. 그리고 드론 영상을 이용하여 사진측량/영상처리 기법을 기반으로 3차원 디지털 표고모델(DEM)과 정사영상을 제작한다. 최종적으로 수동/자동화 기법을 이용하여 제방 표면에 존재하는 중요한 객체(둑마루, 제방법선, 비탈경사면, 침식지역 등)를 디지털 표고모델과 정사영상으로부터 탐지한다. 추후 연구에서는 드론 영상으로부터 중요한 객체를 탐지할 수 있는 자동화 기술 개발을 목표로 한다.

• Design & Manufacturing
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• 제18권2호
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• pp.35-40
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• 2024

Injection molding is a process widely used across various industries for molding plastics, and it is the most commonly applied process in root industries utilizing molds. Among the different types of injection molding, insert injection molding, where busbars are used as inserts, is increasingly being applied in the electric vehicle industry. However, currently, the insert injection molding process is manually performed, with workers placing insert components by hand before injection molding. This results in issues related to productivity, safety, and quality. Additionally, there is a growing demand for automation of such production lines due to hazardous working conditions, economic difficulties in the manufacturing industry, and the decline in the labor force caused by an aging population. This study focuses on the application of an automated system for the insert injection molding process used in electric vehicles. The development of an automated system for the transport and insertion of insert components, as well as the inspection and stacking processes after injection, has resulted in over a 25% improvement in productivity and more than a 27% reduction in defect rates.

• 한국지리정보학회지
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• 제21권2호
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• pp.34-43
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• 2018

수치표고모델(DEM, Digital Elevation Model)은 지형공간 영역의 기본 데이터로서, 다양한 데이터로부터 다양한 방법으로 만들어진다. 수치표고모델이 파생됨에 따라, 적용 분야에서의 그 정밀도 또한 다양하게 변화한다. 본 연구에서는, 대한민국 경상남도 연안의 섬 주변에서 광범위하게 사용되는 있는 두 가지 DEM, 즉 육역관측기술위성 월드 3D 30m(ALOS World 3D 30m) 및 셔틀레이더지형미션 글로벌 30m(SRTM Global 30m)를 비교하였다. 우선 DEM의 첫 번째 통계를 계산한 다음, 해발표고 0을 기준으로 높고 낮은 지역을 시각적으로 비교하기 위하여 Landsat 이미지에 중첩하였다. 연구 결과, DEM은 서로 높은 상관관계가 있으며, 유사한 통계를 가지고 있음을 알 수 있었다. 그리고 구릉지에서는 높은 차이가 거의 없었을 뿐만 아니라, 해안선을 나타낼 수 있었다. 또한 DEM은 많은 음의 값을 가지고 있다는 점이 확인되었으며, 싱크를 채운 후에도 표고가음으로 측정되는 것을 방지하기 위해, 해안 지역 전체를 포함하는 연구 지역을 신중하게 선택해야 할 것으로 보인다.

• 한국산학기술학회논문지
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• 제18권6호
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• pp.44-52
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• 2017

본 논문에서는 전자전장비에 사용할 수 있는 주파수 분석의 정확도가 높으면서 소형화된 디지털주파수판별기 설계방안을 제안하였다. 전자전 장비는 레이더 신호로부터 주파수, 펄스폭, 펄스도착시간, 신호세기, 도달 방위각, 펄스 내 신호변조 등의 정보를 분석할 수 있어야 한다. 전자전장비는 레이더의 매우 좁은 펄스(100ns 이하) 신호를 분석 할 수 있어야 한다. 따라서 전자전장비는 특별한 형태의 수신기 구조가 필요하며, 주파수 측정을 위하여 순시주파수측정방식 구조의 설계가 일반적으로 사용된다. 이 중 대표적으로 사용되는 방식이 디지털주파수판별기다. 기존 디지털주파수판별기는 회로 소자가 개별부품으로 구성되어 부피와 중량이 크며, 고가인 단점이 있다. 이러한 단점을 보완하기 위해, 기존의 디지털주파수판별기는 4개의 지연선($1{\lambda}$, $4{\lambda}$, $16{\lambda}$, $64{\lambda}$)을 사용하는 반면, 제안한 디지털주파수판별기는 3개의 지연선($1{\lambda}$, $4{\lambda}$, $16{\lambda}$)을 사용하였으며, 국내에서도 비약적인 발전을 하고 있는 마이크로 집적회로 기법으로 설계하였다. 주파수 정확도를 향상하기 위한 방법으로 신호세기 검출과 온도보정을 실시하였다. 제안한 디지털주파수판별기는 실험결과 1.5MHz 이하의 높은 주파수정확도를 가지는 것을 확인하였다. 이것은 국외 도입되는 디지털주파수판별기보다 우수한 성능을 가진다고 볼 수 있다.