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Lee, Tae-Hee;Hwang, Bo-Hyun;Yun, Jong-Ho;Park, Byoung-Soo;Choi, Myung-Ryul
- Journal of Digital Convergence
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- v.12 no.1
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- pp.359-364
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- 2014
In this paper, we propose a method for extracting a road area by using the mean-shift method and connected-component method. Mean-shift method is very effective to divide the color image by the method of non-parametric statistics to find the center mode. Generally, the feature points of road are extracted by using the information located in the middle and bottom of the road image. And it is possible to extract a road region by using this feature-point and the partitioned color image. However, if a road region is extracted with only the color information and the position information of a road image, it is possible to detect not only noise but also off-road regions. This paper proposes the method to determine the road region by eliminating the noise with the closing / opening operation of the morphology, and by extracting only the portion of the largest area using a connected-components method. The proposed method is simulated and verified by applying the captured road images.
https://doi.org/10.14400/JDPM.2014.12.1.359 인용 PDF KSCI

Chun, H.W.;Koe, S.J.
- Electronics and Telecommunications Trends
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- v.30 no.5
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- pp.129-137
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- 2015
자율주행차는 운전자가 직접 조작하지 않아도 자동차가 주변 환경을 인식해 위험을 판단하고 주행경로를 계획하여 운전자 주행조작을 최소화하며, 스스로 안전운행이 가능한 인간 친화형 자동차이다. 각국은 프로젝트 등을 통해 기술개발을 지원하고 법제화로 후원하고 있는데, 사람이 운전하지 않는 자율주행차가 도로 위를 달릴 수 있는지 논란이 되고 있어 '운전자가 제어하는 차'를 기준으로 관련법을 제정하고 있다. 업체들은 공공도로에서 주행할 수 있는 임시허가를 받아 자율주행차를 시험주행하는 등 개발에 박차를 가하고 있다.
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Jung Il-dong;Yu Young-ho;Lee Jong-hwan;Kim Kyongsok
- Journal of KIISE:Databases
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- v.32 no.1
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- pp.56-70
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- 2005
The results of location-dependent queries(LDQ) generally depend on the current locations of query issuers. Many mechanisms, e.g. broadcast scheme, hoarding, or racking policy, have been developed to improve the system peformance and provide better services, which are specialized for LDQs. Considering geographical adjacency of data and characteristics oi target area, caching policy and broadcast scheme affect the overall performance in LDQ. For this reason, we propose both the caching policy and broadcast scheme, which these features are reflected in. Based on the adjacency of data in LDQ, our broadcast scheme use Hilbert curve to cluster data. Moreover, in order to develop the caching policy suitable for LDQ on urban area, we apply the moving distance of a MH(Mobile Host) to our caching policy We evaluate the performance of the caching policy measuring the workload of MHs and the correctness of LDQ results and the performance of the broadcast scheme measuring the average setup-time of MHs in our experiments. Finally, we expect that our caching policy Provides more correct answers when executing LDQ in focal cache and leads significant improvement of the performance of MHs. It also seems quite probable that our broadcast scheme leads improvement of battery life of the MH.
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