• Journal of Broadcast Engineering
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• v.22 no.6
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• pp.850-853
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• 2017

In this paper, we propose an image analysis system based on omnidirectional image and object tracking image display using super wide angle camera. In order to generate spherical images, the projection process of converting from two wide-angle images to the equirectangular panoramic image was performed and the spherical image was expressed by converting rectangular to spherical coordinate system. Object tracking was performed by selecting the desired object initially, and KCF(Kernelized Correlation Filter) algorithm was used so that robust object tracking can be performed even when the object's shape is changed. In the initial dialog, the file and mode are selected, and then the result is displayed in the new dialog. If the object tracking mode is selected, the ROI is set by dragging the desired area in the new window.

• The Transactions of the Korea Information Processing Society
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• v.7 no.9
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• pp.3037-3047
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• 2000

This paper describes a method of tracking a close leading vehicle by color image processing using the pairs of tail and brake lights. which emit red light and are housed on the rear of the vehicle in stop-and-go traffic condition. In the color image converted as an HSV color model. candidate regions of rear lights are identified using the color features of a pair of lights. Then. the pair of tailor brake lights are detected by means of the geometrical features and location features for the pattern of the tail and brake lights. The location of the leading vehicle can be estimated by the location of the detected lights and the vehicle can be tracked continuously. It is also possible to detect the braking status of the leading vehicle by measuring the change in HSV color components of the pair of lights detected. In the experiment. this method tracked a leading vehicle successfully from urban road images and was more useful at night than in the daylight. The KAV-Ill (Korea Autonomous Vehicle- Ill) equipped with a color vision system implementing this algorithm was able to follow a leading vehicle autonomously at speeds of up to 15km!h on a paved road at night. This method might be useful for developing an LSA (Low Speed Automation) system that can relieve driver's stress in the stop-and-go traffic conditions encountered on urban roads.

• 대한정형외과스포츠의학회:학술대회논문집
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• 2005.04a
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• pp.35-35
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• 2005

• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.100-102
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• 2005

유비쿼터스는 현재의 제한된 컴퓨팅 환경을 떠나서 시간과 장소에 구애받지 않는 자유로운 컴퓨팅 환경을 제공함으로서 각광받고 있다. 그 중 언제어디서나 정보를 주고받을 수 있으며 가격과 성능 면에서 단연 뛰어난 RFID(Radio Frequency Identification)의 중요성은 점점 증가되고 있는 추세이다. 그러나, 이와 같은 우수성에도 불구하고, 정보 유출의 위험성을 내포하고 있으며, 개인의 위치 추적이나, 비 접근 권한자의 위장행세 등의 사용자 프라이버시 보호에 대한 많은 문제점들을 수반한다. 현재까지 이와 관련된 연구들이 활발히 진행되고 있다. 특히 그 중, Ohkubo의 해시함수를 이용한 프로토콜은 프라이버시 보호 측면에서 위치추적 공격(location tracking), 전방위보안성(forward security)과 같은 문제들에 대한 해결책을 제시하고 있으나, 해시함수를 태그에 직접 구현하는 것은 현재까지는 불가능한 상태이다. 또한, Martin Feldhofer는 대칭키 암호 알고리즘인 AES(Advanced Encryption Standard)를 태그에 구현을 함으로서 암호학적인 강도를 높였으나, 위치추적 공격에 대한 문제정과 물리적 공격에 대한 가정을 하지 않은 단점을 가지고 있다. 본 논문에서는 기존연구에서의 문제점들을 보완하고자 현실적으로 구현 가능한 AES를 사용하고, 위치추적 공격, 비권한자 접근(unauthorized access) 공격과 물리적 공격으로부터 안전하며 전방위보안성을 제공하는 기법을 제안한다.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.467-470
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• 2004

잠수함 정숙화 추세와 복잡한 해양 환경으로 대잠수함전에서 미약한 표적신호를 지속적으로 탐지하기 매우 어려워지고 있어 소나 운용자가 장시간 지속적으로 전방위 표적 탐색하는 부담이 매우 크므로 표적 자동탐지 추적 기능이 필수적이다. 본 논문에서는 장거리 예인 수동소나에 적합한 표적의 자동 탐지 및 추적기법을 제안하고 시뮬레이션과 실제 해상 환경에서 수중 표적신호로 성능을 검증하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.25 no.7
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• pp.962-970
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• 2021

The cause of the majority of vehicle accidents is a safety issue due to the driver's inattention, such as drowsy driving. A forward collision warning system (FCWS) can significantly reduce the number and severity of accidents by detecting the risk of collision with vehicles in front and providing an advanced warning signal to the driver. This paper describes a low power embedded system based FCWS for safety. The algorithm computes time to collision (TTC) through detection, tracking, distance calculation for the vehicle ahead and current vehicle speed information with a single camera. Additionally, in order to operate in real time even in a low-performance embedded system, an optimization technique in the program with high and low levels will be introduced. The system has been tested through the driving video of the vehicle in the embedded system. As a result of using the optimization technique, the execution time was about 170 times faster than that when using the previous non-optimized process.

• Journal of the Korean Arthroscopy Society
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• v.14 no.1
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• pp.13-19
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• 2010

Purpose: To evaluate and compare the postoperative knee stability and functional scores between single- and double- bundle anterior cruciate ligament (ACL) reconstruction at a minimum 2 years follow-up. Materials and Methods: 56 patients (group T) with ACL injury in one knee were recruited with 27 allocated to the double bundle ACL reconstruction group (group D) and 29 to the single bundle ACL reconstruction group (group S). Clinical outcomes including Lysholm knee scores, Tegner activity scores, Lachman and pivot shift test results, and radiographic stabilities were also compared between two groups. Results: Clinical outcomes including Lysholm knee and Tegner activity scores were similar in the two groups at 2 years follow-up. Furthermore, stability results of Lachman test, pivot shift test, and radiological findings failed to reveal any significant inter-group differences. Conclusion: Double bundle ACL reconstruction does not produce better in clinical outcomes and postoperative stabilities.

• Journal of Korean Orthopaedic Sports Medicine
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• v.4 no.1
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• pp.29-35
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• 2005

Purpose: The anterior cruciate ligament(ACL) has a neuromuscular control function as evidenced by the presence within it of mechanoreceptor. Although these mechanoreceptors have been identified, the afferent somatosensory pathways from ACL to the cerebrum have yet to be demonstrated in their entirety. In order to trace these afferent pathway, we conducted a viral trans-synaptic tracing experiment using the neurotropic pseudorabies virus(PRV). Material and Methods: The PRV was injected into the ACL of rats and allowed to replicate and spread trans-synaptically for 6 to 7 days. The brain and spinal cord of each sacrificed rat was then removed and processed immunohistochemically to detect the presence of PRV. Results: PRV-immunoreactive neurons were found to be localized in several different regions from the spinal cord to the cerebrum. Four nuclei in the reticular formation of the brain stem demonstrated strong positive labeling: the mesencephalic reticular nucleus, magnocelluar reticular nucleus, paragigantocellular reticular nucleus, and gigantocellular reticular nucleus. Conclusions: This findings suggests that the nerve endings of the rat ACL project into the cerebrum and that the reticular formation may play an important role in the afferent pathway of those nerve endings.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.5
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• pp.161-168
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• 2011

In 2009, Jeon et al proposed the lightweight strong authentication and strong privacy protocol, where the tag requrires only simple bitwise operations and random number generator. JK-RFID authentication protocol provides strong security: eavesdropping, replay, spoofing, Location tracking, DoS attack and forward security. Nevertheless, this paper points out the vulnerability of the forward security and improve the process of key updating. As a result, proposes an enhanced JK-RFID authentication protocol providing forward security and verify its satisfaction. In addition, a security and an efficiency of the proposed scheme analyze. Since partial adjustments of the key updating operation in JK-RFID authentication protocol, our protocol improve the forward security.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.24 no.2
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• pp.217-226
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• 2006

Extraction and tracking objects are fundamental and important steps of the digital image processing and computer vision. Many algorithms about extracting and tracking objects have been developed. In this research, a method is suggested for tracking a moving object using a pair of CCD cameras and calculating the coordinate of the moving object. A 1/100 miniature of soccer field was made to apply the developed algorithms. After candidates were selected from the acquired images using the RGB value of a moving object (soccer ball), the object was extracted using its size (MBR size) among the candidates. And then, image coordinates of a moving object are obtained. The real-time position of a moving object is tracked in the boundary of the expected motion, which is determined by centering the moving object. The 3D position of a moving object can be obtained by conducting the relative orientation, absolute orientation, and space intersection of a pair of the CCD camera image.