Repository Collection: null
http://hdl.handle.net/20.500.11750/10144
2024-03-28T10:10:02Z
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Sensitivity map generation in electrical capacitance tomography using mixed normalization models
http://hdl.handle.net/20.500.11750/56506
Title: Sensitivity map generation in electrical capacitance tomography using mixed normalization models
Author(s): Kim, Yong Song; Lee, Seonghun; Ijaz, Umer Zeeshan; Kim, Kyung Youn; Choi, Bong Yeol
Abstract: This work is concerned with the generation of sensitivity maps in electrical capacitance tomography based on the concepts of electrical field centre lines. Electrical capacitance tomography systems are normalized at the upper and lower permittivity values for image reconstruction. Conventional normalization assumes the distribution of materials in parallel and results in normalized capacitance as a linear function of measured capacitance. A recent approach is the usage of a series sensor model which results in normalized capacitance as a nonlinear function of measured capacitance. In this study different forms of normalizations are combined with sensitivity maps based on electrical field centre lines and it is shown that a mix of two normalization models improves the reconstruction performance. © 2007 IOP Publishing Ltd.
2007-06-30T15:00:00Z
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Web based Management System of a Remote Mobile Device using Device Management Protocol
http://hdl.handle.net/20.500.11750/56503
Title: Web based Management System of a Remote Mobile Device using Device Management Protocol
Author(s): Ryu, Hyun Ki; Cho, Sung Rae; Piao, Shiquan; Son, Jong Wuk; Jung, Woo Young
Abstract: This paper is to propose and implement a remote phone management system based on the open mobile alliance (OMA) SyncML device management (DM) protocol. The proposed remote phone management system consists of DM Client module, DM Server module and remote phone device management (RPDM) server/client module. Implemented DM client module is suitable to an open platform like Symbian S60. In order to minimize the porting work, a platform adaptation layer (PAL) between basic software and DM engine is designed for DM client. The DM server is consisted of server part, data part and HTTP interface part. It mainly treats the DM protocol and the request of the web admin and the DM client. The RPDM server/client module is deigned to provide a remote management environment based on the web interface. The concerned module functions and interfaces are examined by the SyncML conformance test suite (SCTS) for DM protocol provided by OMA to evaluate whether a normal operation is performed or not. It also showed the controlling method of the mobile devices under the new mobile environment by utilizing the system of RPDM and applying the verified interface.
2007-12-31T15:00:00Z
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4 x 4 Plastic Optical Fiber Star Coupler Incorporated with a Common Polymer Waveguide Optical Power Distribution Region
http://hdl.handle.net/20.500.11750/56447
Title: 4 x 4 Plastic Optical Fiber Star Coupler Incorporated with a Common Polymer Waveguide Optical Power Distribution Region
Author(s): Kim, Kwang Taek; Han, Boo Jeon; Kim, Min Kuk; Kim, Young Ho; Lee, Byeong Ha; Cho, Kyung Jae; Kim, Jong Woo; Lee, Cherl-Hee; Lee, Jonghun
Abstract: Two types of 4×4 plastic optical fiber star couplers incorporated with a polymer waveguide as the optical power distributor are proposed, and their high performances are demonstrated. The characteristics of the proposed star coupler are investigated based on ray optics, and its power distribution performance is evaluated in terms of the flatness of the coupling ratio and the amount of the excess loss. Under the best conditions, the flatness of the coupling ratio and the excess loss of the fabricated device have been obtained as 2.0 dB and 2.5 dB, respectively. © 2011 Taylor & Francis Group, LLC.
2010-12-31T15:00:00Z
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Stereo vision-based vehicle detection using a road feature and disparity histogram
http://hdl.handle.net/20.500.11750/56433
Title: Stereo vision-based vehicle detection using a road feature and disparity histogram
Author(s): Lee, Chung-Hee; Lim, Young-Chul; Kwon, Soon; Lee, Jong-Hun
Abstract: This paper presents stereo vision-based vehicle detection approach on the road using a road feature and disparity histogram. It is not easy to detect only vehicles robustly on the road in various traffic situations, for example, a nonflat road or a multiple-obstacle situation. This paper focuses on the improvement of vehicle detection performance in various real traffic situations. The approach consists of three steps, namely obstacle localization, obstacle segmentation, and vehicle verification. First, we extract a road feature from v-disparity maps binarized using the most frequent values in each row and column, and adopt the extracted road feature as an obstacle criterion in column detection. However, many obstacles still coexist in each localized obstacle area. Thus, we divide the localized obstacle area into multiple obstacles using a disparity histogram and remerge the divided obstacles using four criteria parameters, namely the obstacle size, distance, and angle between the divided obstacles, and the difference of disparity values. Finally, we verify the vehicles using a depth map and gray image to improve the performance. We verify the performance of our proposed method by conducting experiments in various real traffic situations. The average recall rate of vehicle detection is 95.5%. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).
2011-01-31T15:00:00Z