• 정보보호학회논문지
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• 제28권6호
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• pp.1393-1399
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• 2018

다양한 소프트웨어를 사용하는 기업은 보안 업체에서 제공하는 패치관리시스템을 사용하여 소프트웨어의 취약점을 일괄적으로 관리해서 보안 수준을 높인다. 시스템 관리자는 최신 소프트웨어 버전을 유지하기 위해 신규 패치 정보를 제공하는 벤더 사이트를 모니터링 하지만 패치를 제공하는 주기가 불규칙적이고 웹 페이지 구조가 다르기 때문에 패치 정보를 검색하고 수집하는데 많은 비용과 모니터링 시간이 소요된다. 이를 줄이기 위해 키워드나 웹 서비스를 기반으로 패치 정보 수집을 자동화하는 연구가 진행되었으나 벤더 사이트에서 패치 정보를 제공하는 구조가 규격화되어 있지 않기 때문에 특정 벤더 사이트에서만 적용 가능했다. 본 논문에서는 패치 정보를 제공하는 벤더 사이트 구조와 특징을 분석하고 패치 정보 수집에 소모되는 비용과 모니터링 시간을 줄이기 위해서 웹 크롤러를 이용해 패치 정보 수집을 자동화하는 시스템을 제안한다.

• Journal of Information Processing Systems
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• 제13권6호
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• pp.1516-1526
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• 2017

Many organizations today use patch management systems to uniformly manage software vulnerabilities. However, the patch management system does not guarantee the integrity of the patch in the process of providing the patch to the client. In this paper, we propose a method to guarantee patch integrity through dual electronic signatures. The dual electronic signatures are performed by the primary distribution server with the first digital signature and the secondary distribution server with the second digital signature. The dual electronic signature ensures ensure that there is no forgery or falsification in the patch transmission process, so that the client can verify that the patch provided is a normal patch. The dual electronic signatures can enhance the security of the patch management system, providing a secure environment for clients.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권10호
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• pp.3642-3667
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• 2021

Texture synthesis technology has the advantages of repairing texture and structure at the same time. However, during the filling process, the size of the patch is fixed, and the content of the filling is not fully considered. In order to be able to adaptively change the patch size, we used the exemplar-based inpainting technique as the test algorithm, considering the image structure and texture, calculated the image structure patch size and texture patch size, and comprehensively determined the image patch size. This can adaptively change the patch size according to the filling content. In addition, we use multi-layer images to calculate the priority, so that the order of image repair was more stable. The proposed repair algorithm is compared with other image repair algorithms. The experimental results showed that the proposed adaptive image repair algorithm can better repair the texture and structure of the image, which proved the effectiveness of the proposed algorithm.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.1479-1481
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• 2003

The aim of this paper was mainly to interpret the real information-missing patch of image by using the kriging interpolation technology of spatial statistics. The TM Image of the Jingouling Forest Farm of Wangqing Forestry Bureau of Northeast China on 1 July 1997 was used as the tested material in this paper. Based on the classification for the TM image, the information pixel-missing patch of image was interpolated by the kriging interpolation technology of spatial statistics theory under the image treatment software-ERDAS and the geographic information system software-Arc/Info. The interpolation results were already passed precise examination. This paper would provide a method and means for interpreting the information-missing patch of image.

• 한국통신학회논문지
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• 제14권5호
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• pp.435-441
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• 1989

링 급전 선로를 이용해서 두 slot 사이 공진 길이를 lambda/2혹은 로 한 한 3개의 Rectangular Microstrip Patch Antenna를 배열하고 제작하여 방사 패턴 특성을 고찰 했다. 링 급전 선로를 이용한 공진길이 lambda/2인 3개의 Rectangular Microstrip Patch Antenna의 경우 각 Patch Antenna 소자 방향에서 방사 패턴이 고찰되고, 공진 길이 lambda/인 3개의 Rectangular Microstrip Patch Antenna의 경우 각 Antenna소자 사이에서 방사 패턴이 고찰 되었다.

• 전자공학회논문지
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• 제50권6호
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• pp.56-61
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• 2013

이 논문에서는 '0'에 가까운 굴절률을 갖는 단일층 메타물질 커버를 이용한 고 이득 패치 안테나를 제안하였다. 보통의 패치 안테나와 제안된 메타물질 패치 안테나를 전산모의를 통해 비교하였고, 제안된 메타물질 패치 안테나를 제작 및 측정하였다. 제안된 메타물질 패치 안테나는 보통의 패치 안테나에 비해 6.77dB 만큼 더 높은 이득을 가진다.

• 한국통신학회논문지
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• 제28권3A호
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• pp.166-170
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• 2003

In this paper, the characteristics of Koch island microstrip patch antenna are investigated by numerical and experimental methods. The Koch patch is fractal shaped antenna which can be characterized by two properties such as space-filling and self-similarity. Due to its space-filling property of fractal structure, the proposed Koch fractal patch antennas are smaller in size than that of conventional square patch antenna. From numerical and experimental results, it is found that as the iteration number and iteration factor of Koch patch increase, its resonance frequency becomes lower than that of conventional patch, thus contributes to antenna size reduction. In particular, when the fractal iteration factor is 1/4, the fractal antenna is 45% smaller in size than that of conventional patch, while maintaining radiation patterns comparable to those of rectangular antenna and cross polarization level is about -20~-14 dB.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(1)
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• pp.397-400
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• 2001

In this paper, to improve bandwidth of microstrip antenna, we discussed the patch structure using Aperture Stacked Patch. To provid PCS service and IMT-2000 service simultaneous, a microstrip patch antenna needs impedance bandwidth of 22%. But typical microstrip patch antennas have impedance bandwidth of 3∼6%. To analyze characteristics of microstrip pach antenna, we used Ensemble of commercial software. The microsrtip patch antenna was designed and fabricated, tuned. We get following results; 650MHz(33%) of impedance bandwidth for VSWR 1.5. The measured gain of ASP microstrip antenna is 6.94dBi.

• ETRI Journal
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• 제32권4호
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• pp.618-621
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• 2010

A low cross-polarization broadband stacked patch antenna is proposed. By means of the stacked patch configuration and probe-fed strip feed technique, the VSWR 1.2:1 bandwidth of the patch antenna is enhanced to 22% from 804 MHz to 1,002 MHz, which outperforms the other available patch antennas (<10%). Furthermore, the antenna has a cross-polarization level of less than -20 dB and a gain level of about 9 dBi across the operating bandwidth. Simulation results are compared with the measurements, and a good agreement is observed.

• Journal of information and communication convergence engineering
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• 제18권3호
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• pp.162-166
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• 2020

The present paper presents an array antenna of a microstrip patch for 5G applications. Four rectangular microstrip patch elements are arranged in parallel and series to form an array antenna. Two insets are made on both sides of each patch element to achieve a wide frequency bandwidth of 23.97-31.60 GHz. To attain a high gain and wider bandwidth, the microstrip patch antenna is fed using series and corporate feeding networks. Further, three director elements on top of the top-most patch elements, and one reflector element at the open end of each patch element, are added. The addition of the Yagi elements improved the overall gain and acquired a higher radiation efficiency throughout the operating frequency bandwidth, with the array antenna achieving a maximum peak gain of 8.7 dB. The proposed antenna is built on a low-loss and low-cost substrate of FR4-eproxy. The proposed antenna design with a simple structure is suitable for Internet of Things and 5G applications.