• Journal of the Korean Society of Costume
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• v.19
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• pp.41-51
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• 1992

• Journal of the Korean Society of Costume
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• v.54 no.2
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• pp.121-133
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• 2004

This study is about japanese national suit. women's standard dress, and mompe, which were used as a means of controlling people's life and simplifying people's clothing during the chinese-japanese war(1937) and the pacific war(1941-1945). National suit was a semi-military uniform for men and it was the western style suit composed of jacket, under shirt, and pants. National suit was not popular during the early war, but it became popular afterward. Women's standard dress had the two kinds of styles : the kimono and the western style. Women's standard dress was not popularly distributed. Instead, many japanese women wore mompe, the active wear of standard dress. Almost all of japanese women wore mompe by the end of war because of its practical use. The effects of national suit, standard dress, and mompe on the rapid westernization of postwar japanese clothing can be summarized as follows. First, national suit and standard dress contributed to the official acceptance of the western clothes as japanese daily clothes. Second, national suit, standard dress, and mompe changed the traditional view of japanese on clothing and caused the rapid westernization of japanese clothing with the high emphasis on the practical and functional use of clothing. Especially, as japanese women wore mompe as the outer garment, mompe affected the view of japanese on women's body and it served as an important stimulus to speed the westernization of japanese women's clothing.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.75-77
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• 2017

디지털 제어와 사물 인터넷을 통한 네트워크 기반 제어가 확산되면서 정밀 제어를 위한 양자화 오류에 대한 고려의 중요성이 증가하고 있다. 본 연구에서는 이산 시간 출력 궤환 제어 시스템에서 제어 신호 생성에 사용되는 시스템 출력 신호에 양자화 오류가 있을 때, 리아푸노프 시스템 안정성을 보장하는 조건을 선형 행렬 부등식을 통하여 제시한다.

• Proceedings of the Costume Culture Conference
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• 2004.04a
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• pp.144-146
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• 2004

설문지를 이용한 조사연구법에 의해 실행되었으며, 현재 생활한복 디자인 교복을 착용하는 2개 고등학교 학생과 양장교복을 착용하고 있는 2개 고등학교 학생 560명을 조사대상으로 하였으며, 표본은 2003년 10월 조사 당시 모든 조사대상자는 7개월 이상의 교복 착용경험기간을 가지고 있는 학생들로 구성되었다. 자료는 빈도분석, 요인분석, t-test때 의해 분석되었다. (중략)

• Proceedings of the Korea Information Processing Society Conference
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• 2018.05a
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• pp.592-593
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• 2018

사물 인터넷 환경에서 제어 시스템이 네트워크에 연결되면서 정밀 제어를 위한 양자화에 대한 고려가 중요해 지고 있다. 본 연구에서는 프로세스 잡음이 존재하는 이산 시불변 선형 시스템에서 실용적 관찰성을 달성하기 위해서 필요로 하는 데이터 양에 대한 조건을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.05a
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• pp.263-266
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• 2019

단어 임베딩 모델 중 현재 널리 사용되는 word2vec 모델은 언어의 의미론적 유사성을 잘 반영한다고 알려져 있다. 본 논문은 word2vec 모델로 학습된 단어 벡터가 실제로 의미론적 유사성을 얼마나 잘 반영하는지 확인하는 것을 목표로 한다. 즉, 유사한 범주의 단어들이 벡터 공간상에 가까이 임베딩되는지 그리고 서로 구별되는 범주의 단어들이 뚜렷이 구분되어 임베딩되는지를 확인하는 것이다. 간단한 군집화 알고리즘을 통한 검증의 결과, 상식적인 언어 지식과 달리 특정 범주의 단어들은 임베딩된 벡터 공간에서 뚜렷이 구분되지 않음을 확인했다. 결론적으로, 단어 벡터들의 유사도가 항상 해당 단어들의 의미론적 유사도를 의미하지는 않는다. Word2vec 모델의 결과를 응용하는 향후 연구에서는 이런 한계점에 고려가 요청된다.

• Journal of Advanced Navigation Technology
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• v.22 no.3
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• pp.228-232
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• 2018

Dealing with quntization error in a control system properly becomes much more important as many devices are connected through network and controlled. Thus, in this paper, we study a data rate condition on quantizer to achieve practical stability in a discrete time linear time invariant system with state feedback control. First, required data rate is shown to depend on eigenvalue of the closed loop system, the size of the initial state vector, the magnitude of initial quantization error, and control gain in the absence of process noise. It additionally depends on the maximum magnitude of process noise when noise is not zero. Asymptotic analysis shows that a new design method may be needed to reduce the date rate for a networked control in the presence of quantization error and noise.. We provide a simple numerical evaluation of uniform quantizer and logarithmic qunatizer to assess their characteristics of practical stability depending on data rate in the presence of noise.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.4C
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• pp.414-423
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• 2009

This paper considers a linear precoding scheme that achieves near optimal sum rate. While the minimum mean square error (MMSE) precoding provides the better MSE performance at all signal-to-noise ratio (SNR) than the zero forcing (ZF) precoding, its sum rate shows superior performance to ZF precoding at low SNR but inferior performance to ZF precoding at high SNR, From this observation, we first propose a near optimal linear precoding scheme in terms of sum rate. The resulting precoding scheme regularizes ZF precoding to maximize the sum rate, resulting in better sum rate performance than both ZF precoding and MMSE precoding at all SNR ranges. To find regularization parameters, we propose a simple algorithm such that locally maximal sum rate is achieved. As a low complexity alternative, we also propose a simple power re-allocation scheme in the conventional regularized channel inversion scheme. Finally, the proposed scheme is tested under the presence of channel estimation error. By simulation, we show that the proposed scheme can maintain the performance gain in the presence of channel estimation error and is robust to the channel estimation error.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37B no.10
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• pp.938-946
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• 2012

Interference alignment (IA) is a data transmission technique that achieves the maximum degrees-of-freedom (DoF) in the multiuser interference channel for high signal-to-noise ratios (SNRs). However, most prior works on IA are based on the unrealistic assumption that perfect and global channel-state information (CSI) is available at all transmitters and receivers. In this paper, we propose the efficient design of feedback framework for IA that substantially suppresses the feedback overhead. While the feedback overhead in the conventional IA quadratically increases with K, the proposed feedback scheme supports the sequential exchange of computed IA precoders between transmitters and receivers and reduces the feedback overhead that linearly scales with K. Moreover, we analyze the residual interference due to the quantization error in limited feedback and propose the ordered IA algorithm that selects IA pair to minimize the sum residual interference in given channel realizations.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.2
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• pp.273-284
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• 2015

The feasibility conditions of interference alignment (IA) are analyzed for reverse duplex systems, in which one cell operates as downlink (DL) while the other cell operates as uplink (UL) assuming one-sid base station (BS) cooperation. Under general multiple-input and multiple-output (MIMO) antenna configurations, a necessary condition and a sufficient condition for one-shot linear IA are established, i.e., linear IA without symbol or time extension. In several example networks, optimal sum degrees of freedom (DoF) is characterized by the derived necessary condition and sufficient condition. For some special class of networks, a sufficient condition is established in a more compact expression, which also yields the necessary and sufficient condition. Simulation results demonstrate that the proposed IA does not only achieve larger DoF but also significantly improves the sum rate in the practical signal-to-noise ratio (SNR) regime.