• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
• /
• 2003.10a
• /
• pp.385-389
• /
• 2003

최근 고해상도의 인격탐사 위성영상을 이용한 국토공간정보의 환용은 국토계획, 자원조사, 농림업, 건설계획, 국방분야, 환경감시 및 방재, 관광조사 등 여러 분야에서 다양하게 적용되고 있다. 본 연구에서는 과거에 저해상도의 위성영상을 이용하여 수십년전의 지형공간의 조사와 분석을 위한 서로 다른 촬영 시기와 해상도가 다른 Corona 위성사진과 Landsat 위성영상을 합성하여 새로운 퓨젼영상을 생성하는 방법과 퓨젼영상 위에 DEM을 매칭하여 적용하기 위한 벡터데이터 매칭시에 발생할 수 있는 오차의 정도를 확인하기 위한 실험을 통하여 과거 영상복원에 적절한 중첩과 매치의 기법을 발견하여 좀더 정확한 공간정보의 활용 가능성을 제시하고자 하였다.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
• /
• 2003.04a
• /
• pp.139-144
• /
• 2003

수종, 영급, 밀도 등과 같은 산림의 특성을 나타내는 임상구분은 주로 항공사진 육안판독을 통하여 이루어져 왔다. 최근 항공사진과 유사한 공간해상도를 갖춘 고해상도 위성영상이 제공되면서 이를 이용한 임상구분의 가능성에 대한 관심이 높아지고 있다. 본 연구에서는 울산 인근 산림지역의 1m 공간해상도의 IKONOS 입체쌍 영상을 이용하여 임상 판독의 가능성을 분석하였다. IKONOS영상은 기존의 수치임상도와의 중첩을 위하여 수치고도자료(DEM)를 이용한 정사보정을 수행하였으며, 분광밴드의 조합을 통한 칼라영상을 이용하여 육안판독을 시도하였다. 육안판독결과 IKONOS 칼라합성영상에서 천연 소나무림과 활엽수림의 육안구분이 흑백항공사진에 비해 뚜렷하게 나타나는 것을 볼 수 있었으며, 임분의 밀도가 영상에서 나타나는 질감과 패턴의 차이로 구분이 가능하였다. 또한 기존의 임상도를 중첩하여 최근 산지개발, 산불 등으로 훼손된 지점에 대한 구분이 용이하기 때문에 기존의 수치임상도를 화연상에서 직접 갱신함으로써 최근의 산림현황정보의 유지를 하는데 적합한 것으로 나타났다.

• Korean Journal of Optics and Photonics
• /
• v.10 no.6
• /
• pp.473-481
• /
• 1999

We propose a new scheme of hologram multiplexing that can improve the crosstalk noise in the conventional phase-code multiplexing. Our method is based on the idea that the separate holograms to be stored in a certain region of the photorefractve material should have relative phase other than $180^{\circ}$. To demonstrate the new idea we fabricate a phase spatial light modulator using piezo-electric material. The experimental result shows that the crosstalk noise in the restored holograms is reduced much in our method. We also computer simulate the hologram multiplexing and compare the result with the experimental data.l data.

• Proceedings of the Korean Information Science Society Conference
• /
• 2001.10c
• /
• pp.28-30
• /
• 2001

동적 캐시 그룹 구성 정책으로 중첩된 그룹 캐시 구조가 제시되면서 중첩 캐시의 운영 방안에 대한 연구가 필요하게 되었다. 그 기반 연구로 계층 캐시의 효율적 캐시 분배 정책을 그대로 살리되 중첩 그룹 캐시를 이용하는 방안으로 그룹 내 멀티캐스팅 페이지 분배 정책이 제시되고 있다. 그러나 그룹내의 모든 캐시에 해당 페이지를 분배하는 방안은 불필요한 저장 공간 낭비를 가져올 뿐 아니라 그룹 내 통신량 증가라는 문제점을 내포하고 있다. 따라서 본 논문에서는 그룹 내 캐시의 역할을 두 개의 기능으로 나누어 보다 효율적 페이지 분배와 그룹 유지 운영 방안을 제시하려 한다. 또한 중첩 그룹 캐시에서 제기되는 요청 진행 방향 문제에 대한 해결 방안으로 그를 아이디를 활용한 진행 방향 테이블 운영 방안을 제시하려 한다.

• Journal of Korea Spatial Information System Society
• /
• v.6 no.2 s.12
• /
• pp.3-13
• /
• 2004

The TPR-tree exploits bounding rectangles based on the function of time in order to index moving objects. As time passes on, each edge of a BR expands with the fastest velocity vector. Since the expansion of the BR results in a serious overlaps between neighboring nodes, the performance of range query is getting worse. In this paper, we propose schemes to reorganize bounding rectangles of nodes. When inserting a moving object, we exploit a forced merging scheme to merge two overlapped nodes and re-split it. When deleting a moving object, we used forced reinsertion schemes to reinsert other objects of a node into a tree. The forced reinsertion schemes are classified into a deleted node reinsertion scheme and an overlapped nodes reinsertion scheme. The overlapped nodes reinsertion scheme outperforms the forced merging scheme and the deleted node reinsertion scheme in all experiments.

• Journal of Korean Society for Geospatial Information Science
• /
• v.19 no.3
• /
• pp.49-56
• /
• 2011

Because urban areas change rapidly, it is necessary to reflect urban changes in a digital map database in a timely manner. To address these issues, LiDAR data was used to detect changes in urban area buildings. The purpose of this study is to detect object-based building change using LiDAR data and existing digital maps, and classify change types. In the study, we classified change type using overlay and shape comparison with building layer of the digital maps and point-based extracted building outline from the LiDAR data. When applying the overlay method, we were able to increase the accuracy and objectivity of the change detection process throughout an adaptive threshold applied to each object. In the experiments, it was demonstrated that classifying and detecting changes in urban areas using the proposed method can provide superior classification accuracy compared with the existing methodology.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.24 no.8
• /
• pp.1015-1021
• /
• 2020

Mobile news users want news articles without advertising, meanwhile the news providers require advertisement displays in several types to attain advertising revenue. In this paper, we classified the types of advertisements on mobile news articles into fixed article type which is fixed on some areas of articles, fixed screen type which is fixed on mobile screens, and a combination type of them. In addition, we proposed a smart solution based on overlapping method which effectively organize advertisements to not distract the readers. The proposed method is similar to fixed article type and overlapping technique of advertisements on news article's photo or virtual area. The performance evaluation result shows that the proposed method provides more spaces for news articles effectively than the existing methods. Although only some areas of advertisements may be blocked according to the number or size of advertisements, the effect is not critical.

• The KIPS Transactions:PartB
• /
• v.17B no.5
• /
• pp.355-362
• /
• 2010

Face tracking is to estimate the motion of a non-rigid face together with a rigid head in 3D, and plays important roles in higher levels such as face/facial expression/emotion recognition. In this paper, we propose an AAM-based face tracking algorithm. AAM has been widely used to segment and track deformable objects, but there are still many difficulties. Particularly, it often tends to diverge or converge into local minima when a target object is self-occluded, partially or completely occluded. To address this problem, we utilize the scale invariant feature transform (SIFT). SIFT is an effective method for self and partial occlusion because it is able to find correspondence between feature points under partial loss. And it enables an AAM to continue to track without re-initialization in complete occlusions thanks to the good performance of global matching. We also register and use the SIFT features extracted from multi-view face images during tracking to effectively track a face across large pose changes. Our proposed algorithm is validated by comparing other algorithms under the above 3 kinds of occlusions.

• The Journal of the Acoustical Society of Korea
• /
• v.27 no.4
• /
• pp.163-170
• /
• 2008

Most of receiving rooms for the measurement of floor impact sound have rectangular shapes with couple of meters of dimension, with reflective finishing, no furniture, no curtains. Modal overlaps in those condition are the major reason for the low reproducibility, and as a matter of course, the low credibility. It is the major purpose of this study that searching for a better measurement method which mitigate the effect of modal overlap on measurement. Two ways of methods are tested. One is the way described in ISO standards which enables controlling the room modes of receiving rooms, the other is the way which enables to get more precise spatial averages in receiving rooms with room modes. It is not easy maintaining the reverberation time of low frequency bands in the range between 1s and 2s, though it is proven to be effective controlling the room modes with base traps. Space-time average SPL's through combinations of rotating microphones are easy to measure, and have good consistencies with average SPL of entire receiving room.

• Journal of Korea Game Society
• /
• v.17 no.5
• /
• pp.39-50
• /
• 2017

This paper explores the concept of mobile gaming platforms and changes in game play through mobile parameters, focusing on the role of role-playing mobile games through mobile parameters. As a move, the Player combines the mobile media with the game platform. The daily time of the mobile mid-dividualization is reconstructed with the principle of superposition, which affects play experience on the mobile gaming platform. The character of a mobile role-playing game plays a non-integrated play where the player is staying, rather than an avatar character, and exhibits a non-dwelling character as a residential space. Automatic battle also regenerates unused combat forces in the form of explicit integration. The experience of combat in overlapping hours serves as a visual spectacle, and the player inhabits the fighter jets.