• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
• /
• 2004.11a
• /
• pp.291-294
• /
• 2004

최근 들어 위성영상의 사용성 증대와 더불어 고정밀한 공간지리정보의 획득에 대한 관심이 증대되고 있으며, 모델링의 정확도 수준은 수치표고모형, 정사영상 등에 영향을 미치므로 고정밀 모델링 기법을 수행하여야함. 또한 비접근 지역의 경우 많은 기준점을 획득하기 어려우므로 최소 기준점 즉, 2점 의 GPS관측성과와 수치지도를 이용하여 궤도모델링을 수행한 후 모델링(Bundle Adj.)을 수행

• Journal of the Korean Society for Nondestructive Testing
• /
• v.33 no.2
• /
• pp.154-159
• /
• 2013

In this paper, the effect of bolt clamping force and form accuray of contact surface between mirror and mount on mirror surface was studied. Normally, mirror used in reflecting optical system was assembled with mount by bolts or adhesive. In this case, the tension caused by bolt clamping force or adhesive force may distort the mirror surface. Also, form accuracy error of the contact surface have a negative impact on wrenched mirror surface which assembled by bolts or adhesive. In this study, stress and distorted displacements on mirror surface were analyzed according to the different contact surface form accuracies and bolt clamping forces by using the finite element analysis method.

• KIPE Magazine
• /
• v.10 no.5
• /
• pp.29-32
• /
• 2005

• STIMA Bulletin
• /
• s.6
• /
• pp.35-47
• /
• 2007

• 기계와재료
• /
• v.15 no.3 s.57
• /
• pp.21-28
• /
• 2003

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.30 no.4
• /
• pp.679-691
• /
• 2020

In the future, 5G technology will become the core infrastructure driving the 4th industrial era. For intelligent super-convergence service, it will be necessary to collect various personal information such as location data. If a person's high-precision location information is exposed by a malicious person, it can be a serious privacy risk. In the past, various approaches have been researched through encryption and obfuscation to protect location information privacy. In this paper, we proposed a new technique that enables statistical query and data analysis without exposing location information. The proposed method does not allow the original to be re-identified through polynomial-based transform processing. In addition, since the quality of the original data is not compromised, the usability of positioning big data can be maximized.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.28 no.12
• /
• pp.993-998
• /
• 2017

In this paper, a high-accuracy current sensing technique for three-phase current paths in an electrical switchboard is proposed. Conventional open-style current sensors using magnetic sensors show inaccurate sensing performance with more than 10% error due to undesired magnetic field interference from neighboring paths. To increase accuracy, large and expensive current transformers with large permeabilities have been used, which increased the cost and size. The proposed technique can improve the measured magnetic field by the calculation of magnetic interference effect from neighboring current paths. The relationship between neighboring magnetic fields and the desired magnetic field is theoretically analyzed in a general case. The proposed technique is verified using magnetic field simulations in a three-phase busbar environment.

• Journal of Advanced Navigation Technology
• /
• v.22 no.2
• /
• pp.64-69
• /
• 2018

Automatic test equipment for field maintenance of aircraft mounted equipment is effective for integrated design when operating a small number of aircraft for special purposes. The integrated automatic test equipment identifies commonly used interfaces and is used for branching or generating routes for each unit under test specific inspection. High-precision signals such as RTD, TC, and analog voltage can cause measurement errors due to conduction resistance during signal branching and connection when generating branches and paths. The measurement error caused by the resistance of the wire leads to a lot of restrictions in designing the equipment to be inspected. In this paper, we propose a method of calibrating highly accurate signals of an integrated automatic inspection equipment that minimizes measurement errors of analog voltage and high - precision signals.

• Bulletin of the Korean Space Science Society
• /
• 1996.05a
• /
• pp.10-10
• /
• 1996

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2014.04a
• /
• pp.601-602
• /
• 2014