• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.47 no.5
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• pp.358-363
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• 2019

If the EOIR equipment mounted on an unmanned aircraft transmits images and receives commands through a data link, there may be delays in data transmission depending on the transmission path of the data and the conditions of the ground equipment or wireless network. This increases the possibility of initial target LOCK-ON failure due to the difference between the time when the received image is viewed and the time when the image is taken. Therefore, this paper proposed a way to use frame indexes to synchronize with images, and to increase the success of target tracking by adding frame indexes to commands from the ground station.

• Korean Journal of Construction Engineering and Management
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• v.11 no.2
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• pp.106-115
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• 2010

Recently, as the size of construction projects are getting bigger and higher, more effective managing methods are required in management areas such as duration reduction, cost reduction and quality management. In the current construction industry, conjunction with IT(Information Technology) is being noticed as a solution to support these needs. Various IT solutions such as Bar Code, Personal digital assistant(PDA), global positioning system(GPS), radio frequency identification(RFID) are being developed. In this research, among the various IT solutions, the Real Time Locating System(RTLS) which is acknowledged as a technology with high applicational potential is analyzed. Based on this analysis, a locating system to apply in construction sites is developed and validated. The locating system is developed to prevent construction disasters through real-time management of workers and equipment, which enables effective application in the area of construction safety management. Moreover, applications of the locating system in many different areas like construction material realtime monitoring, construction automation, construction quality management, maintenance management are expected.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.15 no.2
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• pp.96-104
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• 2004

무선 주파수 인식(RFID) 기술은 차세대 유비쿼터스 환경에서 중요한 기술적 위치를 차지할 것으로 예상되고 있으며, 다양한 분야에서 새로운 시장을 형성해 나갈 것으로 기대된다. 그러나 RFID 태그 내용의 노출 혹은 임의의 태그에 대한 위치 추적 가능성은 RFID의 실용화에 있어서 사용자의 프라이버시 위협이라는 심각한 문제를 야기할 수 있다. 따라서 본 고에서는 이러한 RFID 프라이버시 보호를 연구 동향들을 살펴보고 방식별 장단점을 비교한다.

• Journal of KIISE:Computing Practices and Letters
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• v.7 no.6
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• pp.703-714
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• 2001

In C language, a local buffer overflow in stack can destroy control information stored near the buffer. In case the buffer overflow is used maliciously to overwrite the stored return address, the system is exposed to serious security vulnerabilities. This paper analyzes the process of buffer overflow hacking and methodologies to avoid the attacks in details. And it proposes a device of static buffer overflow detection by using function summary and tracking information flow of buffer domain at assembly source code level(SASS, Static Assembly Source code Scanner) and then show the feasibility and validity of it by implementing a prototype in Pentium based Linux environment.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.20 no.5
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• pp.3-10
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• 2010

Unlinkability and traceability are basic security requirements of a group signature scheme. In this paper, we analyze two recent group signature schemes, Lee et al.'s scheme and Zhu et al.'s scheme. We show that Lee et al,'s scheme does not work correctly. Further, it fails to meet unlinkability, that is, anyone who intercepts or receives group signatures are able to check if they are from the same signer. We also show that Zhu et al.'s scheme is unable to satisfy traceability, that is, a malicious group member can generate valid group signatures that cannot be opened. Moreover, once becoming group member, the malicious group member will never be revoked from group. Besides, Zhu et al.'s scheme fails to satisfy forward security, a requirement claimed by authors.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.4B
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• pp.353-364
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• 2002

In this paper, a new onto-digital stereo object-tracking system using hierarchical digital algorithms and optical BPEJTC is proposed. This proposed system can adaptively track a moving target by controlling the convergence of stereo camera. firstly, the target is detected through the background matching of the sequential input images by using optical BPEJTC and then the target area is segmented by using the target projection mask which is composed by hierarchical digital processing of image subtraction, logical operation and morphological filtering. Secondly, the location's coordinate of the moving target object for each of the sequential input frames can be extracted through carrying out optical BPEJTC between the reference image of the target region mask and the stereo input image. Finally, the convergence and pan/tilt of stereo camera can be sequentially controlled by using these target coordinate values and the target can be kept in tracking. Also, a possibility of real-time implementation of the adaptive stereo object tracking system is suggested through optically implementing the proposed target extraction and convergence control algorithms.

• Korean Journal of Head & Neck Oncology
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• v.26 no.2
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• pp.178-182
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• 2010

서 론 : 두경부암의 예후에 가장 중요한 인자는 진단시 병기와 치료 후 재발의 유무이다. 따라서, 재발 병변을 조기에 발견하는 것이 매우 중요하다. 본 연구에서는 두경부암 환자의 추적 관찰에서 $^{18}F$-FDG PET/CT의 유용성에 대해 알아보고자 하였다. 대상 및 방법 : 2004년 4월부터 2008년 8월까지 고려대 안암병원에서 두경부암으로 치료를 완료한 후 추적관찰이 가능하였던 88 예의 환자를 대상으로 하였다. 환자는 본원의 두경부암 추적관찰 양식에 따라 술 후 6, 12개월째 $^{18}F$-FDG PET/CT를 시행하였으며, 원발부위 및 경부 재발, 원격전이와 중복암의 진단에 있어 $^{18}F$-FDG PET/CT의 민감도, 특이도, 양성예측율, 음성예측율을 평가하였고, 기존의 추적관찰 방법과 이를 비교하였다. 결 과 : 원발부위 재발의 진단에 있어 민감도, 특이도, 양성예측율, 음성예측율은 각각 95%, 97%, 90%, 98% 였다. 경부전이 재발의 진단에 있어서는 각각 94%, 98%, 83%, 99%였으며, 원격전이 및 이차암 진단에 있어서는 94%, 100%, 100%, 99%였다. 원발부위 재발은 고식적인 진단 방법, 원격전이와 이차암은 $^{18}F$-FDG PET/CT가 진단에 의미있게 유리하였다. 결 론 : $^{18}F$-FDG PET/CT는 두경부암의 추적관찰 과정에서 재발 여부를 판정하는데 있어 매우 유용하며, 특히 원격전이 및 이차암의 발견에 있어 유용하다. 그러나, 위양성 및 위음성의 가능성으로 고식적인 진단 방법과 병행해야 진단의 효과를 높힐 것으로 생각된다.

• Journal of the Korea Society of Computer and Information
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• v.25 no.7
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• pp.57-64
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• 2020

In this paper, we propose an scalable re-detection for correlation filter in visual tracking. In real world, there are lots of target disappearances and reappearances during tracking, thus failure detection and re-detection methods are needed. One of the important point for re-detection is that a searching area must be large enough to find the missing target. For robust visual tracking, we adopt kernelized correlation filter as a baseline. Correlation filters have been extensively studied for visual object tracking in recent years. However conventional correlation filters detect the target in the same size area with the trained filter which is only 2 to 3 times larger than the target. When the target is disappeared for a long time, we need to search a wide area to re-detect the target. Proposed algorithm can search the target in a scalable area, hence the searching area is expanded by 2% in every frame from the target loss. Four datasets are used for experiments and both qualitative and quantitative results are shown in this paper. Our algorithm succeed the target re-detection in challenging datasets while conventional correlation filter fails.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.4C
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• pp.514-523
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• 2004

In this paper, a new intelligent moving target tracking and surveillance system basing on the pan/tilt-embedded stereo camera system is suggested and implemented. In the proposed system, once the face area of a target is detected from the input stereo image by using a YCbCr color model and then, using this data as well as the geometric information of the tracking system, the distance and 3D information of the target are effectively extracted in real-time. Basing on these extracted data the pan/tilted-embedded stereo camera system is adaptively controlled and as a result, the proposed system can track the target adaptively under the various circumstance of the target. From some experiments using 80 frames of the test input stereo image, it is analyzed that standard deviation of the position displacement of the target in the horizontal and vertical directions after tracking is kept to be very low value of 1.82, 1.11, and error ratio between the measured and computed 3D coordinate values of the target is also kept to be very low value of 0.5% on average. From these good experimental results a possibility of implementing a new real-time intelligent stereo target tracking and surveillance system using the proposed scheme is finally suggested.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2006.06b
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• pp.227-232
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• 2006

In this paper, a Kalman filter application for GDSS(Group Digital Surveillance System) developed to protect an aquaculture farms is discussed GDSS is composed by a WIWAS(Watching, Identification, Warning, and Action System) and a FDS(Fishery Detection System) that will monitor incoming and outgoing vessels in the aquaculture farms. In the FDS, a tracking function to track vessels without F-AIS(Fishery Automatic Identification System) is needed and the Kalman filter is applied to track vessels around the aquaculture farms. Some simulation results for the multi-objects with white noise is presented and the adaptation possibility for tracking system is discussed.