• Annual Conference of KIPS
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• 2018.10a
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• pp.501-503
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• 2018

본 논문은 개인에 맞는 외출 시 필요한 정보를 문에 출력하여 외출 준비를 도와주는 스마트 도어 아이디오를 제안한다. 스마트 도어를 활성화 시켜 내장된 웹 카메라로 촬영된 사진을 이용하여 얼굴인식을 수행하고 수행한 결과로 개안 아이디를 통해 데이터베이스를 조작한다. 데이터베이스에 개인 준비물 데이터는 모바일 앱에서는 도어락을 제어하는 추가적인 기능도 수행한다. 개인 중비물외에도 개인 일정, 당일 날씨 및 교통 정보를 스마트 도어 LCD에 출력과 동시에 음성으로 알려준다. 본 논문에서 제시하는 스마트 도어는 LCD에 정보 출력뿐만 아니라 half-mirror와 함께 설계되어 전신 거울 기능도 포함된다. 스마트 도어는 어디에서 사용되는 문에 유용한 기능을 추가하여 공간 활용에 용이하고 필요한 소지품을 잊지 않고 챙길 수 있다.

• The Transactions of the Korea Information Processing Society
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• v.6 no.12
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• pp.3500-3513
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• 1999

It is recognized that object-oriented methods and formal methods are two different main streams that will influence on the future direction of software engineering. A merging effort on these two technologies, named "a formal approach on system specifications using object-oriented methods" emerges rapidly and produces remarkable research results LOTOS is well-suited to an object-based approach. However, to provide a full object-oriented approach, we need to model generalization (i.e. inheritance and polymorphism). Most authors who have examined this topic have proposed extensions to LOTOS. As an extension of such an effort, this paper proposes a method that generates LOTOS specification from static structure diagrams in UML.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.4
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• pp.870-879
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• 1997

At crypto'89 meeting, D. chaum suggested an undeniable signature scheme. Undeniable signatures are verified via a protocol between the signer and verifier, so the cooperation of the signer is necessary. So far, ther have been several variants of undeniable signatures to obtain a signature scheme, which can control the abous of ordinary digital signatures. In this paper we integrate these variants into a generalized undeniable-type signature scheme. Also, it will be pointed out, that undeniable signature schemes but its first realization are vulnerable in full view of eavesdropping third party. Moreover, to solve this problem, we propose a new type of digital signature, called "result-indisting-uishable undeniable signature" and construct a practical protocol that implements it.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.8 no.1
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• pp.232-248
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• 2014

A series of kernel regression (KR) algorithms, such as the classic kernel regression (CKR), the 2- and 3-D steering kernel regression (SKR), have been proposed for image and video super-resolution. In existing KR frameworks, a single algorithm is usually adopted and applied for a whole image/video, regardless of region characteristics. However, their performances and computational efficiencies can differ in regions of different characteristics. To take full advantage of the KR algorithms and avoid their disadvantage, this paper proposes a kernel regression framework for video super-resolution. In this framework, each video frame is first analyzed and divided into three types of regions: flat, non-flat-stationary, and non-flat-moving regions. Then different KR algorithm is selected according to the region type. The CKR and 2-D SKR algorithms are applied to flat and non-flat-stationary regions, respectively. For non-flat-moving regions, this paper proposes a similarity-assisted steering kernel regression (SASKR) algorithm, which can give better performance and higher computational efficiency than the 3-D SKR algorithm. Experimental results demonstrate that the computational efficiency of the proposed framework is greatly improved without apparent degradation in performance.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.5 no.2
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• pp.330-343
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• 2011

In this paper, we propose two schemes to reduce the complexity of fixed-complexity sphere decoder (FSD) algorithm in the ordering and tree-search stages, respectively, while achieving quasi-ML performance. In the ordering stage, we propose a QR-decomposition-based FSD signal ordering based on the zero-forcing criterion (FSD-ZF-SQRD) that requires only a few number of additional complex flops compared to the unsorted QRD. Also, the proposed ordering algorithm is extended using the minimum mean square error (MMSE) criterion to achieve better performance. In the tree-search stage, we introduce a threshold-based complexity reduction approach for the FSD depending on the reliability of the signal with the largest noise amplification. Numerical results show that in $8{\times}8$ MIMO system, the proposed FSD-ZF-SQRD and FSD-MMSE-SQRD only require 19.5% and 26.3% of the computational efforts required by Hassibi’s scheme, respectively. Moreover, a third threshold vector is outlined which can be used for high order modulation schemes. In $4{\times}4$ MIMO system using 16-QAM and 64-QAM, simulation results show that when the proposed threshold-based approach is employed, FSD requires only 62.86% and 53.67% of its full complexity, respectively.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.6 no.1
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• pp.426-445
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• 2012

Conventional rate control (RC) schemes for H.264 video coding usually regulate output bit rate to match channel bandwidth by adjusting quantization parameter (QP) at fixed full frame rate, and the passive frame skipping to avoid buffer overflow usually occurs when scene changes or high motions exist in video sequences especially at low bit rate, which degrades spatial-temporal quality and causes jerky effect. In this paper, an active content adaptive frame skipping scheme is proposed instead of passive methods, which skips subjectively trivial frames by structural similarity (SSIM) measurement between the original frame and the interpolated frame via motion vector (MV) copy scheme. The saved bits from skipped frames are allocated to coded key ones to enhance their spatial quality, and the skipped frames are well recovered based on MV copy scheme from adjacent key ones at the decoder side to maintain constant frame rate. Experimental results show that the proposed active SSIM-based frameskip scheme acquires better and more consistent spatial-temporal quality both in objective (PSNR) and subjective (SSIM) sense with low complexity compared to classic fixed frame rate control method JVT-G012 and prior objective metric based frameskip method.

• Journal of the Korean Society for Library and Information Science
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• v.31 no.2
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• pp.139-175
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• 1997

This study attempts to assess university library organizational effectiveness and to develop an instrument to measure the construct. Major findings of the study are as follows. First, organizational effectiveness criteria can be reduced to fifteen factors. Second, four distinct clusters of libraries are identified, each showing a unique effectiveness profile. Third, there are significant differences in dimensions of organizational effectiveness according to the number of users, full-time staff, unit and position to which respondents belong. The investigation shows that organizational effectiveness of university libraries is, indeed, a multidimensional construct, implying that no single measure of effectiveness Is sufficient to describe an organization.

• Journal of Korea Society of Industrial Information Systems
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• v.13 no.1
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• pp.57-67
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• 2008

In this paper, we present an adaptive block matching motion estimation using optical flow. In the proposed algorithm, we calculate the temporal and spatial gradient value for each pixel value from tile differential filter, and estimate the optical flow which is used to decide the location and the size of the search region from the gradient values by least square optical flow algorithm. In particular, the proposed algorithm showed a excellent performance with fast and complex motion sequences. From the computer simulation for various motion characteristic sequences. The proposed algorithm shows a significant enhancement of PSNR over previous blocking matching algorithms.

• Journal of the Korean Society for Library and Information Science
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• v.43 no.3
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• pp.379-397
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• 2009

The purpose of this study is to analyze the development and features of the abridged DDC (Dewey Decimal Classification), one of the main factors for DDC's success. For the study, a comparison table including the publication years and the physical features has been presented based on the general relationship between the full edited DDC and the abridged DDC. In addition, the contents and features have been analyzed from the first to the latest (14th) edition. Lastly, the time of introduction of four supplementary tables used in the abridged DDC and its development have been investigated.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.8
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• pp.3623-3627
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• 2012

The modern society has become full-fledged entry into the information age since spread of Internet. In the information age, internet was developed from the wired access to the wireless Internet access. When a surge in demand for wireless Internet access, efficiency and performance of 2.4GHz band which leads to saturation of the communication was significantly fall. Accordingly, the communication of the 5GHz band came to be interested. In this paper, we studied the design and fabrication of u-slot microstrip patch antenna to be used in wireless communication systems operating at around 5GHz band. To obtain antenna parameters such as patch size, inter patch space, antenna was simulated by HFSS(High Frequency Structure Simulator). From these parameters, u-slot microstrip patch antenna is fabricated using FR-4 substrate of dielectric constant 4.4. The characteristics of fabricated antenna were analyzed by network analyzer.