• ETRI Journal
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• v.40 no.2
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• pp.237-245
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• 2018

The Distributed Modulated Wideband Converter (DMWC) is a networking system developed from the Modulated Wideband Converter, which converts all sampling channels into sensing nodes with number variables to implement signal undersampling. When the number of sparse subbands changes, the number of nodes can be adjusted flexibly to improve the reconstruction rate. Owing to the different attenuations of distributed nodes in different locations, it is worthwhile to find out how to select the optimal sensing node as the sampling channel. This paper proposes the spectrum sensing of DMWC based on a Markov random field (MRF) to select the ideal node, which is compared to the image edge segmentation. The attenuation of the candidate nodes is estimated based on the attenuation of the neighboring nodes that have participated in the DMWC system. Theoretical analysis and numerical simulations show that neighboring attenuation plays an important role in determining the node selection, and selecting the node using MRF can avoid serious transmission attenuation. Furthermore, DMWC can greatly improve recovery performance by using a Markov random field compared with random selection.

• ETRI Journal
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• v.40 no.3
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• pp.366-375
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• 2018

Recently, techniques involving head-mounted displays (HMDs) have attracted much attention from academia and industry owing to the increased demand for virtual reality and augmented reality applications. Because HMDs are positioned near to users' eyes, it is important to solve the accommodation-vergence conflict problem to prevent dizziness. Therefore, holography is considered ideal for implementing HMDs. However, within the Nyquist region, the accommodation effect is limited by the space-bandwidth-product of the signal, which is determined by the sampling number of spatial light modulators. In addition, information about the angular spectrum is duplicated over the Fourier domain, and it is necessary to filter out the redundancy. The size of the exit-pupil of the HMD is limited by the Nyquist sampling theory. We newly propose a holographic HMD with an expanded exit-pupil over the Nyquist region by using the time-multiplexing method, and the accommodation effect is enhanced. We realize time-multiplexing by synchronizing a high-speed digital micromirror device and a liquid-crystal shutter array. We also demonstrate the accommodation effect experimentally.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.9 no.3
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• pp.990-1013
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• 2015

Deploying sensors into a target region is a key issue to be solved in building a wireless sensor network. Various deployment algorithms have been proposed by the researchers, and most of them are evaluated under the ideal conditions. Therefore, they cannot reflect the real environment encountered during the deployment. Moreover, it is almost impossible to evaluate an algorithm through practical deployment. Because the deployment of sensor networks require a lot of nodes, and some deployment areas are dangerous for human. This paper proposes a deployment approach to solve the problems mentioned above. Our approach relies on the satellite images and the Virtual Force Algorithm (VFA). It first extracts the topography and elevation information of the deployment area from the high resolution satellite images, and then deploys nodes on them with an improved VFA. The simulation results show that the coverage rate of our method is approximately 15% higher than that of the classical VFA in complex environment.

• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.547-550
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• 2001

Through matched filtering synthetic aperture radar (SAR) produces high-resolution imagery from data collected by a relative small antenna. While the impulse response obtained by the matched filter approach produces the best achievable signal-to-noise ratio, large sidelobes must be reduced to obtain higher-resolution SAR images. So, many enhancement methods of SAR imagery have been proposed. As a deconvolution method, the phase-extension inverse filtering is based on the characteristics of the matched filtering used in SAR imaging. It improves spatial resolution as well as effectively suppresses the sidelobes with low computational complexity. In the phase-extension inverse filtering, the impulse response is obtained from simulation with a point target. But in a real SAR environment, for example ERS-1, the impulse response is distorted by many non-ideal factors. So, in the phase-extension inverse filtering for a real SAR processing, the magnitudes of the frequency transfer function have to be compensated to produce more desirable results. In this paper, an estimation method to obtain a more accurate impulse response from a real SAR image is studied. And a compensation scheme to produce better performance of the phase-extension inverse filtering is also introduced.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.4 no.3
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• pp.358-379
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• 2010

Multiple object association is an important capability in visual surveillance system with multiple cameras. In this paper, we introduce locally initiating line-based object association with the parallel projection camera model, which can be applicable to the situation without the common (ground) plane. The parallel projection camera model supports the camera movement (i.e. panning, tilting and zooming) by using the simple table based compensation for non-ideal camera parameters. We propose the threshold distance based homographic line generation algorithm. This takes account of uncertain parameters such as transformation error, height uncertainty of objects and synchronization issue between cameras. Thus, the proposed algorithm associates multiple objects on demand in the surveillance system where the camera movement dynamically changes. We verify the proposed method with actual image frames. Finally, we discuss the strategy to improve the association performance by using the temporal and spatial redundancy.

• Journal of Fashion Business
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• v.13 no.5
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• pp.135-148
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• 2009

The purpose of this research is to examine changes in Japanese fashion design through analysis of the background and characteristics of 'Japanesque Modern'. With the advent of globalization and pressures to enhance international competitiveness, key players in both Japanese government and industry feel an urgent need to establish a distinctive brand for its products. 'Japanesque Modern' was launched in January 2006 as a nationwide campaign through the support of the Japanese Ministry of International Trade and Industry (MITI). 'Japanesque Modern' strives to be a national movement, enhancing Japan's brand image while promoting continuous industrial innovation. 'Japanesque Modern' unites Japanese culture, design, and aesthetics with advanced technology, bringing traditional concepts to enrich contemporary life styles. In order to exemplify the 'Japanesque Modern' ideal, existing market products and content that reflect the concept were selected for the 'Japanesque Modern Collection' by the Japanesque Modern Council. In making these selections, the Council emphasized criteria based on three Japanese spiritual values: Craftsmanship; Manner; and Hospitality. As a result, three designs concepts have emerged in the 'Japanesque Modern Collection': the 'convergent method'; the 'conversion method'; and the 'emphasis method'. This research will explore these design concepts and their relationship to 'Japanesque Modern'.

• Journal of the Korean Society of Fashion and Beauty
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• v.1 no.1 s.1
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• pp.143-151
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• 2003

As korean women despised to transform their appearance into totally different shape, and they regarded to enhance a inherent beauty ideal beauty, korean traditional make-up culture was natural. But in modern society, make-up has been developing as one of the beauty industry and it means make-up involves more meanings than primitive period and needs to study its multi-dimensional connotation to understand in the culture. The purposes of this study were to find out what was represented in make-up ad and how it has been changed. The data of this study were collected from make-up advertisement printed in 'Hyang Jang' which is a periodical of amole pacific cosmetic industry from 1972-2001, and qualitatively analysed. As a results of content analysis were: The characteristics of non-verbal expression in make-up advertisements were different by the time. Generally person-appeal advertisements were more than product-appeal advertisements. And in the 1970s and early 1980s, person-appeal advertisements were appeal to the lifestyle, but after that person itself was appealed. And also after early 1980s, image-appeal advertisements were increased.

• Korean Institute of Interior Design Journal
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• no.25
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• pp.184-190
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• 2000

If we take account of the Architectural Tradition which aims a construction of better environment, we can see that this tradition has ended historically toward Utopia. It is a continual trend from ancient to contemporary epoch especially in each transitional periods. Utopia is an ideal commonwealth in which inhabitants exist under perfect conditions, ideally perfect places or state of things. But, Dystopia implies skeptical perspective on the future which has emerged as a result of the increasing awareness about crisis concerning negative aspects highlighted by progress of science and technology since Modern era. Dystopia is the opposite of Utopia which was a propaganda used by Modern architecture and has characteristics of Post-Modernity. Utopias plans are complete projects of image, its goal is an improvement according to the eras. Its plans are characterized by rigid geometrical pattern as circle and square, which contain generally center·axis·enclosure·boundary·symmetry. Recent architectural circumstances no longer reflect utopian visions. Dystopias plans have described extreme mechanism, destructive offense, expression of fragmentation and differentiation in contemporary architecture. Therefore, as the Utopian architecture describes characteristics of the era unlike the continuity of its concept, the Dystopian architecture will find its expression differently while maintaining its basic concept and intention.

• Korean Institute of Interior Design Journal
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• no.19
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• pp.45-52
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• 1999

This study is on Buckminster Fuller, who is generally known as a structure engineering architect, and his influences. Fuller's radical and utopian ideas and designs were regarded as 'paper architecture'. But considering today's high cost of energy and the limited natural resources, Fuller's Dymaxion theory must be re-evaluated. Fuller's influences on the contemporary architecture are summarized as follows. 1) His idea of controlling the environment through the use of technology influenced today's 'High-Tech' architects. Architecture is no-longer designed purely by its formal character, but becomes a tool of investigating environmental significance of modern technology. 2) Through systemizing mechanical equipment, Dymaxion House prototype, and aggregation of high-tech mechanical equipments, influenced Archigram & Metabolist's capsule idea. It is expressed as a plug-in module equipment of 'High-Tech' architecture which has flexible interior with mechanical exterior image. 3) Megastructure. The Manhattan dome project gave an influence to many engineer/architects who tried to achieve an ideal artificial environment. This is in connection to 1960's utopian projects. Today's megastructures show new possibilities in urbanism and architecture. Fuller's comprehensive idea of humans living in harmony in the universe shows possibilities not only in structural engineering, but in solving various problems that confront today's architecture.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2006.05a
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• pp.55-58
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• 2006

There can be two definitions of modern ideal medical surroundings. One is medical services satisfied patients' with their desire and the other is places suited to remedy realized by rational operation. Particularly, in case of dental service, there is a need for an effective regard of moving lines and there are many rooms for a dental service belonged to a curer and not a curer. So a design has been developed by many concerns. flow do we proffer more familiar and comfortable places to both a curer and not a cuter. Nowadays, the design is making progress to the unprecedented and up-to-date direction. I would suggest a general plan used by a nature of an original art for this design. The design used by a nature between human beings and things is able to induce comforts and intimacies. So to speak, I would like to remove artificial design and keep up organic lines, shapes and forms of a nature like it is. This study grasps the organizational limitation of this design and the visual characteristic of organic forms used by harmonious image of a nature and a new way is applied to limited medical places, a dental service, based on the study. Also, I'm go to examine the meaning and worth of a new design and suggest the direction of it.