• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.7
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• pp.1288-1293
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• 2007

In this paper, a compact triplexer has been implemented for Cellular/GPS/USPCS applications. In order to realize the proposed triplexer, we use a low-temperature co-fired ceramic (LTCC) substrate to enable a fully compact integrated module using a multi-layer high-density architecture, and conjugate-match the channels instead of the open matching technique. The three dimensional design capability of LTCC substrates can reduce the overall size of the triplexer, resulting in dimensions on the order of $3.2\;mm\;{\times}\;2.5\;mm\;{\times}\;1\;mm$. The measured result shows that the triplexer has, in Cellular/GPS/USPCS bands, the insertion loss of less than 0.5dB, less than 1.7dB, and less than 0.9dB in order. Also, the triplexer has an isolation of more than 15dB in the cellular and USPCS bands and an isolation of more than 20dB in the GPS band.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.06a
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• pp.173-175
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• 2013

In this paper, we propose a fast and low-complexity Motion Estimation (ME) algorithm for High Efficiency Video Coding (HEVC). Motion estimation occupies 77~81% of the amount of computation in HEVC. After all, the main key of codec implementation is to find a fast and low-complexity motion estimation algorithm and architecture. The proposed algorithm uses only 1% of the amount of operations compared to full search algorithm while maintaining compression performance with slight loss of 0.6% (BDBR).

• International Journal of Contents
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• v.14 no.3
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• pp.1-6
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• 2018

For 3D display applications, auto-stereoscopic display methods that can provide 3D images without glasses have been actively developed. This paper is concerned with developing a display system for elemental images of real space using integral imaging. Unlike the conventional method, which reduces a color image to the level as much as a generated depth image does, we have minimized original color image data loss by generating an enlarged depth image with interpolation methods. Our method was efficiently implemented by applying a GPU parallel processing technique with OpenCL to rapidly generate a large amount of elemental image data. We also obtained experimental results for displaying higher quality integral imaging rather than one generated by previous methods.

• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.1003-1007
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• 1987

The system start-up function of TDX-1A that should be executed during installation or emergency has been designed to meet requirements of the distributed real time control system. It is performed in a centralized manner by the dedicated processor according to the maintenance and administration mechanism of the system. Upon execution, it provides information on the system state for the ESS personal. In additions, it protects the loss the charging and statistics data, and minimizes the effect on the customer service. This paper describes the design concept of the system startup function and its implementation method and also calculates its the execution time.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39A no.9
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• pp.563-565
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• 2014

Beam forming techniques are used to increase the efficiency of using frequency. In this paper we design and implement Butler matrix to be used for ISM band. The implemented Butler matrix has the insertion loss of maximum 6.7dB and the maximum phase shift error of $-6.51^{\circ}{\sim}7.17^{\circ}$ over 2.4~2.485GHz.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39A no.9
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• pp.560-562
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• 2014

Broadband power divider operating over the frequency band assigned for all domestic mobile communications is designed and implemented. The implemented power divider with 20Watts power rating has the maximum insertion loss of 3.49dB, input reflection coefficient of below -18.48dB and output reflection coefficient of below -20.2dB, above 24.7dB isolation and -141.2dBc of 3rd PIMD over the operating frequency of 810 ~ 2620MHz.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.41 no.4
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• pp.39-44
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• 2004

The three-dimensional (3D) wavelet transform with motion compensation is suitable for very high quality video coding due to both spatial and temporal decorrelations. However, it still suffers from image degradation such as ringing artifact and afterimage because of the loss of high frequency components by quantization. This paper proposes an iterative regularized enhancement of the motion-compensated 3D wavelet coded video. We also propose the adaptive implementation of the constraints for the regularization. It selectively suppresses the high frequency component along only the corresponding edge direction.

• IEMEK Journal of Embedded Systems and Applications
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• v.8 no.3
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• pp.155-161
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• 2013

To reduce the personnel and material loss caused by fire, we propose the automatic fire extinguishing system based on the ignition point tracking using the flame detecter. This automatic fire extinguishing system is composed of the flame detecting system and the fire extinguishing system based on the water cannon. We study the method for the ignition point tracking and the automatic fire extinguishing using the water cannon and the flame detecter. The flame detecting system for the early fire detection and the ignition point tracking has to be satisfied the requirement of the detecting range and the flame detection time. So we study the signal process algorithm for an improvement of the flame detecting system.

• Journal of the Korea Institute of Military Science and Technology
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• v.12 no.3
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• pp.354-359
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• 2009

In this paper, the Autocoast algorithm is proposed for EOTS to overcome the target occlusion status. Coast mode, one of tracking modes, is to maintain the servo slew rate with the tracking rate right before the loss of track. The Autocoast algorithm makes decision of entering coast mode by the prediction of target occlusion and tries to refind target after the coast time. This algorithm composes of 3 steps, the first step is the prediction process of the occlusion by target-like background, the second one is the check process of the occlusion happened after background intensity variation, and the last one is the process of refinding target. The result of computer simulation, test under laboratory, and real test with EOTS shows the applicability for the automatic video tracking system.

• Journal of Communications and Networks
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• v.12 no.2
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• pp.181-190
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• 2010

A multitude of overlay network designs for resilient routing, multicasting, quality of service, content distribution, storage, and object location have been proposed. Overlay networks offer several attractive features, including ease of deployment, flexibility, adaptivity, and an infrastructure for collaboration among hosts. In this paper, we explore cooperation among co-existing, possibly heterogeneous, overlay networks. We discuss a spectrum of cooperative forwarding and information sharing services, and investigate the associated scalability, heterogeneity, and security problems. Motivated by these services, we design Synergy, a utility-based overlay internetworking architecture that fosters overlay cooperation. Our architecture promotes fair peering relationships to achieve synergism. Results from Internet experiments with cooperative forwarding overlays indicate that our Synergy prototype improves delay, throughput, and loss performance, while maintaining the autonomy and heterogeneity of individual overlay networks.