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Pohang, South Korea

Hansei University is a mid-sized University located in Gunpo City near Seoul, South Korea. It was established in 1953. The University originally started as the Full Gospel Theological College and changed its name to Soonshin University. In 1997, the name was finally changed to Hansei University. It has currently eight departments including Media and Communication Arts, Business Administration, Humanity and Social Science, Information Technology, Music, Design, and Nursing.The university is widely recognized especially for choral music. Regarded as one of the top choral music universities in Eastern Asia, Hansei University boasts a choral music faculty of six professor/conductors on top of its 40+ music faculty. The university is planning to open an international school for choral music in 2015/16. Wikipedia.

Kim H.,Hansei University
International Journal of Distributed Sensor Networks

An overview of supervisory control and data acquisition (SCADA) systems is presented and relevant security concerns are addressed. To secure IP-based SCADA systems, it is vital to implement secure architectures which prevent access to the SCADA from corporate IT, in addition to excellent management practices in managing IP-based networks. We give an overall explanation of SCADA systems along with their security concerns and vulnerability. In the case of legacy SCADA systems, the concerns regarding security were minimal since it used proprietary networks; however, since the move of SCADA systems to the Internet, security problems have become an imperative issue, especially problems regarding IP-based systems. We also discuss various forms of threats and vulnerabilities on future SCADA systems applied with IPv6 over low-power, wireless personal area networks (6LoWPANs) and suggest security management methods to overcome these concerns. In order to identify and remove various vulnerabilities and threats to SCADA systems over IP-based wireless sensor networks, especially for 6LoWPAN applications, we examine possible threats and propose proper and precise security management methods. © 2012 HyungJun Kim. Source

Ha J.-E.,Korea University | Lee W.-H.,Hansei University
Optical Engineering

In visual surveillance, robust foreground object detection is an essential step for further processing such as segmentation, tracking, and extraction of a scene's contextual information. Typical approaches continuously update background images and use then for detecting foreground objects. They involve many parameters that should be adjusted according to the situation where surveillance cameras are operating. We propose an algorithm for the robust detection of foreground objects using multiple difference images that requires only one parameter to adjust. We show that the proposed algorithm gives comparable results with less computation time through experimental results using test images with groundtruths. © 2010 Society of Photo-Optical Instrumentation Engineers. Source

Um K.,Hansei University | Yoo S.,Amotech Company
Electronic Materials Letters

Laser theodolite devices for detecting distance have been used in order to measure the distance of an object target from the location of an observer by transmitting ultra-short pulses toward a target and using a receiver to correlate the pulses returning from the target with corresponding reference pulses derived from the transmitted pulses. In order to replace analog devices, digital versions have been developed recently. In this paper, we propose the development of a digital laser theodolite for detecting distance using the phase difference of incident and reflected waves. Such a device can save expense and manufacturing time. Further, such a device can be realized in SOC (system on chip), an integrated circuit (IC) that integrates all components of a computer or other electronic system into a single chip, in order to utilize the device as a laser distance sensor as part of an overall sensor system. © 2013 The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht. Source

Um K.,Hansei University
Japanese Journal of Applied Physics

In this paper, we present a practical and quantitative method for theoretical determination of the complex transmission zero locations of lumped two-port power systems. We have derived several closed-forms of transmission zero characteristic equations in order to prove an important result-that the integer pairs of complex transmission zeros originate solely from the cross-coupled portion of the system. © 2013 The Japan Society of Applied Physics. Source

Kang D.-J.,Pusan National University | Lee W.-H.,Hansei University
International Journal of Precision Engineering and Manufacturing

A method to detect calibration patterns using fast adaptive binarization and plane homography for images having complicated backgrounds and taken under lighting condition of industrial fields is proposed. The preprocessing step of involving the calibration of a camera, as required to measure object dimensions, must be able to extract calibration points from a calibration pattern. However, proper lighting conditions for the camera calibration of a measurement system are rarely provided in industrial settings. In this paper, a plane homography of calibration points extracted by fast adaptive image binarization is used for the automatic detection of a local set of calibration points. The integral image method is used as a central part for the rapid processing of adaptive image binarization. The extracted point set provides a transformation matrix of the plane homography and guides the extraction of other calibration points for cluttered backgrounds with irregular lighting conditions. During the calibration of the camera, a calibration point filtering procedure by a data In/Out system iteratively selects more correct calibration points while rejecting outliers and noisy data. Experiments using actual images verify that the proposed method can be applied to camera calibration with poor quality images having cluttered backgrounds obtained under uneven illumination. © KSPE and Springer 2010. Source

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