• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.12 no.6
• /
• pp.147-153
• /
• 2012

As IT circumstance is complicated and the scale of infra increase, a recognition of security information system and data availability are raised. At this point, a value of information assets regards important, a study of high performance backup system for disaster recovery countermeasure is a field to impact on business directly. Therefore, this study executes duplication of high performance backup system and data consistency verification. And, a performance of comparison to DB table recovery process, a transaction process speed of duplication according to network bandwidth, and performance evaluation were executed.

• Journal of KIISE:Computer Systems and Theory
• /
• v.31 no.3_4
• /
• pp.224-238
• /
• 2004

Multi-modality image registration is a widely used image processing technique to obtain composite information from two different kinds of image sources. This study proposes an image registration method based on moment information and surface distance, which improves the previous surface-based registration method. The proposed method ensures stable registration results with low registration error without being subject to the initial position and direction of the object. In the preprocessing step, the surface points of the object are extracted, and then moment information is computed based on the surface points. Moment information is matched prior to fine registration based on the surface distance, in order to ensure stable registration results even when the initial positions and directions of the objects are very different. Moreover, surface comer sampling algorithm has been used in extracting representative surface points of the image to overcome the limits of the existed random sampling or systematic sampling methods. The proposed method has been applied to brain MRI(Magnetic Resonance Imaging) and PET(Positron Emission Tomography), and its accuracy and stability were verified through registration error ratio and visual inspection of the 2D/3D registration result images.

• The KIPS Transactions:PartD
• /
• v.8D no.1
• /
• pp.62-70
• /
• 2001

Correct descriptions for software component functions become a strong requirement in developing critical software especially on the area of real-time applications. In this paper, we introduce both formalization of software design using patterns and verification methods in order for the components to increase their understandability. In particular, the paper investigates into a means of formal description techniques based on VDM++ for the software components, and provides adequacy proof steps for a given functional descriptions.

• Proceedings of the KIEE Conference
• /
• 1998.11b
• /
• pp.579-581
• /
• 1998

본 연구에서는 $11.7GHz{\sim}12.2GHz$ 주파수 대역의 무궁화 위성방송 송 수신기 정합표준 2.0과 디지털 위성방송 제한수신 정합 잠정표준을 만족하는 무궁화 위성방송 수신시스템 분야에 대한 연구를 수행하였다. 상위 표준에 의거하여 제한 수신모듈을 탑재한 디지털 위성방송 수신장치 개발에 따른 타당성과 신뢰성을 검증하고자 Subscribed and Per-Per-View 채널 디스크램블링 및 가입자 관리(Subscriber Management)에 필요한 데이터 ECM, EMM, RCM 등의 데이터 축출과 처리과정을 모델링하고 모의 실험 수신기(IRD : Integrated Receiver and Decoder)를 제작하여 한국 전자통신연구원에서 작성한 "제한 수신 시스템 신뢰성 검증시험절차서"에 따라 동작반응을 시험하였다.

• Journal of the Korea Computer Graphics Society
• /
• v.7 no.1
• /
• pp.37-49
• /
• 2001

We propose an optimization of mutual information for multiresolution image registration to represent useful information as integrated form obtaining from complementary information of multi modality images. The method applies mutual information as cost function to measure the statistical dependency or information redundancy between the image intensities of corresponding pixels in both images, which is assumed to be maximal if the images are geometrically aligned. As experimental results we validate visual inspection for accuracy, changning initial condition and addictive noise for robustness. Since our method uses the native image rather than prior feature extraction, few user interaction is required to perform the registration. In addition it leads to robust density estimation and convergence as applying non-parametric density estimation and stochastic multiresolution optimization.

• Korean Journal of Remote Sensing
• /
• v.35 no.6_1
• /
• pp.907-917
• /
• 2019

Recently, the demand for high-resolution satellite images increases in many fields such as land monitoring and terrain analysis. Therefore, the need for geometric correction is increasing. As an automatic precision geometric correction method, there is a method of automatically extracting the GCP by matching between the GCP Chip and the satellite image. For automatic precision geometric correction, the success rate of matching GCP Chip and satellite image is important. Therefore, it is important to evaluate the matching performance of the manufactured GCP Chip. In order to evaluate the matching performance of GCP Chips, a total of 3,812 GCP Chips in South Korea were used as experimental data. The GCP Chip matching results of KOMPSAT-3A and Google Map showed similar matching results. Therefore, we determined that Google Map satellite imagery could replace high-resolution satellite imagery. Also, presented a method using center point and error radius of Google Map to reduce the time required to verify matching performance. As a result, it is best to set the optimum error radius to 8.5m. Evaluated the matching performance of GCP Chips in South Korea using Google Maps. And verified matching result using presented method. As a result, the GCP Chip s in South Korea had a matching success rate of about 94%. Also, the main matching failure factors were analyzed by matching failure GCP Chips. As a result, Except for GCP Chips that need to be remanufactured, the remaining GCP Chips can be used for the automatic geometric correction of satellite images.

• Journal of the Institute of Electronics Engineers of Korea SP
• /
• v.40 no.4
• /
• pp.256-265
• /
• 2003

To improve reliability and practicality, a fingerprint-based biometric system needs to be robust to rotations of an input fingerprint and the processing speed should be fast. Accordingly, this paper presents a new filterbank-based fingerprint feature extraction and matching method that is robust to diverse rotations and reasonably fast. The proposed method fast extracts fingerprint features using a directional filter bank, which effectively decomposes an image into several subband outputs Since matching is also performed rapidly based on the Euclidean distance between the corresponding feature vectors, the overall processing speed is so fast. To make the system robust to rotations, the proposed method generates a set of feature vectors considering various rotations of an input fingerprint and then matches these feature vectors with the enrolled single template feature vector. Experimental results demonstrated the high speed of the proposed method in feature extraction and matching, along with a comparable verification accuracy to that of other leading techniques.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2018.11a
• /
• pp.93-96
• /
• 2018

2017년 5월 31일 지상파 UHD 본 방송 서비스가 개시된 이후, 기존 HD 방송 대비 4배 이상 선명한 영상 제공을 통해 시청자는 현장감과 사실감을 체감할 수 있게 되었다. 또한, HD 방송과 차별화된 효과를 보다 더욱 극대화하기 위해 2018년 러시아 월드컵 기간 동안 고명암비와 광색역 기술을 적용한 지상파 UHD HDR 방송 서비스를 제공하였다. 이에 본 논문에서는 지상파 UHD HDR 방송 서비스 제공을 위한 관련 기술들을 연구하고 송출 시스템을 설계 및 구축하였다. 그리고 이를 검증하기 위해 2018 러시아 월드컵 기간 동안 UHD HDR 방송을 송출함으로써 수신단과의 정합성을 입증하였다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.17 no.10 s.113
• /
• pp.929-934
• /
• 2006

In the paper, we suggest a simpler synthesis technique for capacitively-coupled match circuit(CCMC) which have a function of DC block and impedance matching simultaneously, and introduce a stability margin analysis technique for designing microwave amplifier under conditionally stable state. Stability margin analysis is used to determine optimum match point that ensure maximum gain under the given stability margin. It can reduce time consuming work for selecting match points in the conditionally stable state. Also, suggested miniaturization scheme of matching network is distinguished from previous work with respect to reducing deterministic parameters for CCMC synthesis. To verify utility of suggested method, 24 GHz gain block is fabricated under conditionally stable state using an internal thin-film fabrication process, Measured results show a stable gain of 10 dB and flatness of 1 dB, which is well coincident with simulated one.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.15 no.8
• /
• pp.788-793
• /
• 2004

This paper proposes new configuration for the dual power amplifier that operates at 5.8 GHz for the wireless LAN and 1.8 GHz for the PCS. It dose not select the input signal but amplify the dual band signals simultaneously. Broadband diplexer is used at the input to separate the dual band signals. Output power of each amplifier is 1 W. The PBG is employed to improve the performance of power amplifier. Generally, the PBG is employed at the end of output matching network. But in this paper, the PBG is employed in the load pull output matching circuit of amplifer to maximize the output power.