• The Journal of the Korea Contents Association
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• v.8 no.10
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• pp.54-63
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• 2008

With the improvement of computer performance in Mobile Environments, the users demand for the multimedia player is getting higher, which will be the major force behind the wide distribution of the media player that allows several moving pictures to run simultaneously using multiple windows on the screen. Products that adopted the same method used for a single moving picture and yet support the several moving pictures simultaneously emerged; however, they are not immune from problems. In this paper, we propose method to solve the problems of blinking, play prioritization processor and semi-transparent processor that occur when appling several moving pictures to the method used for a single moving picture and suggested the possible solutions. Taking it one step further, it focused on design and implementation of the media player that allows several moving pictures using overlapping and overlay technique by recognizing the biggest problem, which is that the above media play is not supported when playing several moving pictures simultaneously.

• 한국HCI학회:학술대회논문집
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• 2008.02b
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• pp.298-303
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• 2008

Watching a program on IPTV among the numerous choices from the internet requires a burden of searching and browsing for a favorite one. This paper introduces a new concept called Mosaic Map and presents how it provides preview information of image map links to other programs. In Mosaic Map the pixels in the still image are used both as shading the background and as thumbnails which can link up with other programs. This kind of contextualized preview of choices can help IPTV users to associate the image with related programs without making visual saccades between watching IPTV and browsing many choices. The experiments showed that the Mosaic Map reduces the time to complete search and browsing, comparing to the legacy menu and web search.

• Journal of Dental Rehabilitation and Applied Science
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• v.27 no.3
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• pp.285-292
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• 2011

The purpose of thise study was to measure the thickness of the sinus lateral wall using computed tomography (CT), and to find the most suitable vertical position for lateral window opening prior to sinus elevation. Thirty patients requiring sinus elevation had CT images taken with Philips Brilliance iCT. The thickness of the sinus lateral wall was measured according to its vertical position against the sinus inferior border, and its mean was calculated through three repeated measurements. When measured 2 mm above the sinus inferior border (SIB+2), the thickness of the sinus lateral wall was observed to be more than 2 mm. When measured 3 mm above the sinus inferior border (SIB +3), the sinus lateral wall was less than 2 mm in thickness. It is recommended that the lateral wall window be made 3 mm above the sinus inferior border when performing sinus elevation using the lateral approach.

• Journal of Korea Multimedia Society
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• v.6 no.6
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• pp.1015-1024
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• 2003

With the improvement of the computer performance, the users demand for the multimedia player is getting higher, which will be the major force behind the wide distribution of the media player that allows several moving pictures to run simultaneously using multiple windows on the screen. Products that adopted the same method used for a single moving picture and yet support the several moving pictures simultaneously emerged; however, they are not immune from problems. In this paper, we propose method to solve the problems of blinking, play prioritization processor and semi-transparent Processor that occur when appling several moving pictures to the method used for a single moving picture and suggested the possible solutions. Taking it one step further, it focused on design and implementation of the media player that allows several moving pictures using overlapping and overlay technique by recognizing the biggest problem, which is that the above media play is not supported when playing several moving pictures simultaneously.

• Journal of KIISE:Software and Applications
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• v.31 no.10
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• pp.1320-1331
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• 2004

A video adaptation system translates the source video stream into appropriate video stream while satisfying the network and client constraints and maximizing the video quality as much as possible. This paper proposes a semi-dynamic video adaptation scheme, in which several intermediate video streams and the information for the measuring of video quality are generated statically. The intermediate video streams are generated by reducing the resolution of the video stream by a power of two several times, and they are stored as the intermediate video streams on the video server. The statically generated information for the input video stream consists of the degrees of smoothness for each frame rate and the degree of frame definition for each pixel bit rate. It helps to dynamically generate the target video stream according to the client's QoS at run-time as quickly as possible. Experimental result shows that the proposed adaptation scheme can generate the target video stream about thirty times faster while keeping the quality degradation as less than 2% comparing to the target video stream that is totally dynamically generated, although the extra storages for the intermediate video streams are required.

• Korean journal of communication and information
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• v.40
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• pp.45-79
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• 2007

This study explored three questions: (1) what are the motives of producing and using user-created contents (UCC, video clips which are produced and uploaded at various web sites by individuals), (2) what are the gratifications that users obtain from UCC, and (3) what are the differences of gratifications according to individual uses of UCC. A survey was conducted to 258 UCC users and data were factor-analyzed to find the dimensions of motives and gratifications. As for the motives of UCC uses, six factors were constructed: self-expression, private life, participation, information retrieval, rest, and entertainment, among which self-expression showed the largest variation. As for the gratifications, five factors were constructed: self-expression, rest, information retrieval, socializing, and entertainment.

• Resources Recycling
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• v.28 no.3
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• pp.3-14
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• 2019

Copper is one of the first metals utilized by humankind about 11,500 years ago. But copper is not plentiful metallic element in the earth's crust. Copper has a high thermal and electric conductivity and is relatively corrosion resistant. In principle copper is virtually 100 % recyclable as an element without loss of quality. The recycling of copper scrap reduces the energy consumption and environmental burden, comparing to the primary metal production. Currently, approximately 30% of the global copper supply provides by recycling. Copper scrap is smelted in primary and secondary smelter. Type of furnace and process steps depend on the quality and grade of scrap. Depending on copper content of the secondary raw material, refining is required, which is usually done through electrorefining. This work provides an overview of the primary copper production and recycling process.

• Journal of Broadcast Engineering
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• v.27 no.4
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• pp.499-510
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• 2022

This paper introduces a video editing system for senior creator who is not familiar to video editing. Based on video analysis techniques, it provide various information and delete unwanted shot. The system detects shot boundaries based on RNN(Recurrent Neural Network), and it determines the deletion of video shots. The shots can be deleted using shot-level significance, which is computed by detecting focused area. It is possible to delete unfocused shots or motion-blurred shots using the significance. The system detects object and face, and extract the information of emotion, age, and gender from face image. Users can create video contents using the information. Decorating tools are also prepared, and in the tools, the preferred design, which is determined from user history, places in the front of the design element list. With the video editing system, senior creators can make their own video contents easily and quickly.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.06a
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• pp.109-110
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• 2017

파노라마 영상은 $360^{\circ}$ 방향의 모든 경치를 담는 기법을 말한다. 파노라마 영상은 전문적 기술자들이 여러 영상을 정합하여 제작되었지만, 기술이 점차 발전하여 현재는 일반 사용자들도 스마트 폰을 이용하여 손쉽게 파노라마 영상을 제작할 수 있다. 하지만 이는 파노라마 정지영상에 한해있으며 아직까지 파노라마 동영상은 제작에 있어서 기술적 어려움이 있다. 최근 들어서 파노라마 동영상 제작을 위한 여러 동영상 간의 시간축 동기화는 연구되었는데 연속되는 프레임들을 하나의 시퀀스로 묶어 시퀀스 단위로 키포인트 및 디스크립터를 추출 및 비교를 통해 동영상 간의 시간축을 동기화시키는 방향으로 나갔다. 하지만 동영상 시퀀스 간의 간격이 좁아 중복되는 데이터의 양이 많아 디스크립터 비교 연산 시간이 오래 걸리고, 동영상 간의 시퀀스 단위만으로 비교하기 인해 프레임 단위의 정확한 시간축 동기화에 어려움이 있었다. 본 논문에서는 이전 연구의 단점을 개선하여 여러 동영상 간의 시간축을 하나로 동기화시키는 기술을 최적화하는 방법을 제안한다.

• Explosives and Blasting
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• v.20 no.3
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• pp.39-48
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• 2002

우리나라는 지질특성상 각종 토공사를 시행할 때 암반 절취가 필수적이다. 그러나 소음진동 규제법의 강화, 각종 건설민원 발생 및 안전관리를 강화하기 위하여 종래에 해오던 일반발파(대발파)공법을 적용할 현장은 거의 없는 실정이므로, 미진동 발파공법과 진동제어 발파공법에 대한 기준품셈 및 시공기술에 대한 연구가 더욱 필요하다. 또한 종래의 미진동 발파공법의 품셈기준으로 되어있는 미진동 파쇄기(CCR, 상품명 Fine Cracker)를 사용한 발파공법은 기존의 암절취에 기술적 문제가 일부 대두되므로 이를 보완하기 위해 퇴적암 절취현장에서 미진동 파쇄기.정밀.에멀젼 화약을 사용하여 비교실험을 하였으며, 최근에 새로운 미진동 파쇄기(상품명 : Fine Cracker Plus)를 개발 시판하게 되어 이를 비교 검토하였다. 그 결과 일축 압축강도 $1623~2060kg/\textrm{cm}^2$의 경암 내지 극경암에서도 양호한 발파효과를 볼 수 있었다.