• ETRI Journal
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• 제42권1호
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• pp.138-149
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• 2020

In this paper, we describe a simultaneously transmitted jamming (ST-jamming) for bi-directional in-band full-duplex (IFD) system to improve information security at the physical layer. By exploiting ST-jamming, each legitimate user transmits data samples and jamming samples together in one orthogonal frequency division multiplexing symbol according to given traffic asymmetry. Regardless of the traffic difference in both directions in IFD communication, eavesdropping of confidential information is prevented in both directions simultaneously without the loss of data rate. We first propose an encoding scheme and the corresponding decoding scheme for ST-jamming to be used by the legitimate users. In addition, we study a transceiver structure of the legitimate users including a baseband modem uniquely designed for the use of ST-jamming. The leakage of confidential information at an eavesdropper is then quantified by studying the mutual information between the confidential transmit signals and the received signals of the eavesdropper. Simulation results show that the proposed ST-jamming significantly reduces the leakage of legitimate information at the eavesdropper.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.260-262
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• 2003

New Image registration techniques are developed for determining geometric distortions between two images of the same scene. First, the properties of the Fourier transform of a two dimensional function under the affine transformation are given. As a result, techniques for the estimation of the coefficients of the distortion model using the spectral frequency information are developed. Image registration can be achieved by applying the fast Fourier transform (FFT) technique for cross correlation of misregistered imagery to determine spatial distances. The correlation results may be rather broad, making detection of the peak difficult, what can be suppressed by enhancing cross-correlation technique. Yield greatly improves the delectability and high precision of image misregistration.

• 한국비블리아학회지
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• 제11권2호
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• pp.141-156
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• 2000

본 연구의 목적은 문헌정보학 연구동향 및 연구방법론에 관련된 국내 연구들을 분석함으로서 앞으로의 국내 문헌정보학 연구방향을 제언하고자 한다. 이를 위한 분석 자료로 90년대 이후 문헌정보학의 연구동향 및 연구방법론에 관련된 10편의 국내 연구들을 선정하여 세 그룹으로 나눈 후 조사.분석한다. 분석결과 정보학 분야에 연구의 관심이 집중되고 문헌연구와 조사연구 등이 많이 사용된다. 주 연구자는 교수 그룹이며 학제간의 연구 및 여러 계층의 공동연구가 부족하다. 연구결과 기존의 연구방법뿐만 아니라 새로운 연구방법에 관한 논의와 다각적인 연구의 필요성이 요구된다. 또한 이러한 논의는 계속적으로 이루어져야 하며 문헌정보학 전문가를 위한 연구기반 지식의 개발과 문헌정보학의 연구기준의 필요성이 강조된다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.994-997
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• 2006

We have fabricated white polymeric light-emitting devices (WPLEDs) from polyfluorene-based (PFO) blue and MEH-PPV polymer blending systems. A device structure of ITO / PEDOT:PSS / Blending polymer / Blue polymer / LiF / Al was employed. This structure of double emission layers results in the significant improvement of white color shift phenomenon. A current efficiency of 4.67 cd/A ($3,900cd/m^2$, 6.4V) and a brightness value of $17,600cd/m^2$ at 9.4 V with (0.34, 0.35) CIE coordinates at 5V and (0.29, 0.29) at 9V were obtained.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 춘계학술대회
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• pp.31-33
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• 2022

ScienceON, RISS, DBpia 등 연구자들이 R&D 과정 중에 이용하는 연구 정보 서비스는 포털 형식의 사용자 인터페이스와 함께 요구 대응 방식(Pull)의 검색 기능이 주를 이루고 있다. 그렇지만, 연구 과정과 결과를 자유롭게 공유·활용하고 협업 연구에 필요한 다양한 도구와 서비스를 제공하는 개방형 협업에 대한 요구가 점차 커지고 있어, 이러한 서비스 역할의 한계도 존재한다. 이에 우리는 R&D 전주기를 지원하기 위한 개인화된 연구 환경 인터페이스를 중심으로 선제 대응 방식(Push)의 목표 지향적 분석을 수행하는 WithON을 설계한다. 본 연구를 통해 제시하는 WithON이 개방형 협업을 위한 가상 공간을 제공함으로써 기존 연구 정보 서비스 방식을 근본적으로 바꿀 것으로 기대한다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.233-236
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• 2004

In this study, we analyzed the accuracy of the conversion from DLT parameters to physical camera parameters and optimized the use of DLT model for non-metric cameras in photogrammetric tasks. Using the simulated data, we computed two sets of physical camera parameters from DLT parameters and Bundle adjustment for various cases. Comparing two results based on the RMSE values of check points, we optimized the arrangement of GCPs for DLT.

• 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.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.1024-1027
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• 2006

The electrical and the optical properties of organic light-emitting devices (OLEDs), with and without various kinds of multiple heterostructures were investigated. The efficiency in green OLEDs were significantly enhanced by the structure of the multiple heterostructures acting as a hole transport layer (HTL) rather than by the number of periods. These results indicate that highly efficient green OLEDs utilizing multiple heterostructures acting as a HTL can be fabricated.

• 정보저장시스템학회논문집
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• 제3권2호
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• pp.86-93
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• 2007

In this paper we explain why future probe storage systems will use patterned media. As a model system, magnetic patterned media will be discussed, even though their data density is limited to about $7Tbit/in^2$. The first results on magnetic probe storage on patterned media are presented, and the problem of switching field distribution is discussed in detail. Finally we will present the first steps into two-dimensional coding for patterned media.

• Nuclear Engineering and Technology
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• 제34권6호
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• pp.610-618
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• 2002

A study of the conceptual data modeling to realize the decommissioning database on the HRR-1&2 was carried out. In this study, the current state of the abroad decommissioning database was investigated to make a reference of the database. A scope of the construction of decommissioning database has been set up based on user requirements. Then, a theory of the database construction was established and a scheme on the decommissioning information was classified . The facility information, work information, radioactive waste information, and radiological information dealing with the decommissioning database were extracted through interviews with an expert group and also decided upon the system configuration of the decommissioning database. A code which is composed of 17 bit was produced considering the construction, scheme and information. The results of the conceptual data modeling and the classification scheme will be used as basic data to create a prototype design of the decommissioning database.