• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2007.11a
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• pp.1280-1283
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• 2007

본 연구는 홀로그래픽 정보저장기기에서 트래킹 서보 제어를 통해 원하는 데이터를 정확하게 기록 및 재생하기 위한 LQG 제어기를 제안하고 검증하는 것을 목적으로 한다. 서보광이라는 추가적인 광을 사용할 것을 제안하여, 서보광과 참조광 간의 간섭에 의해 기록매체에 서보 신호를 얻을 수 있게 하는 홀로그램을 형성한다. 기록 및 재생과정에서 신호광이 기록, 재생됨과 동시에 서보광에 의한 서보 신호가 재생되고, 그 신호의 경로에 설치된 포토 다이오드로부터 디스크 형태에서 발생 할 수 있는 외란을 감지하게 된다. 감지된 외란 신호인 트래킹 에러 신호를 통해 참조광이 디스크의 정확한 위치에 조사되게 하기 위해 평판유리 액츄에이터를 사용한다. 이와 같은 서보 제어를 수행했을 경우 데이터 페이지가 정확하게 재생되며 SNR 과 BER 이 개선되는 것을 확인할 수 있다.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2017.11a
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• pp.109-110
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• 2017

전국적으로 도시재생에 대한 연구와 사업이 진행되고 있는 시점에서 창원시의 마을흔적보전사업은 지역 맞춤형 도시재생의 한 가지 사례가 될 수 있다. 마을흔적보전사업은 재개발, 재건축으로 사라지는 옛 마을의 흔적을 보전하여 주민들의 추억과 마을역사, 공동체 문화를 이어주는 도시재생사업의 일환이다. 마을흔적보전사업은 현대산업발전의 시대적 산물이며 주민들의 공통된 추억과 기억이 담긴 공간과 환경이 도시개발과정에서 멸실되는 것을 방지한다. 또 지역의 문화적 가치를 창출함으로서 '지역맞춤형 도시재생'을 실현하는 한 가지 실천적 방법이 될 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.921-924
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• 2014

본 논문에서는 다시점 파노라마 동영상의 효율적인 재생을 위해서 분할 및 선택적 재생 기법을 통해 데이터의 전송 및 재생을 제한하는 방법을 제안한다. 큐브 파노라마로 제작된 다시점 파노라마 동영상을 분할전송을 통해 사용자가 필요로 하는 부분만 전송하는 방법으로 콘텐츠 전송의 효율을 높일 수 있도록 하며, 데이터를 해상도 및 화질에 따라 다른 레이어로 구성하여 디바이스 및 전송속도에 따라 차등적으로 서비스 될 수 있도록 한다. 콘텐츠의 분할 재생 시 발생하는 동기화 문제를 해결하고 이러한 과정을 안드로이드 디바이스를 통해 직접 테스트를 진행해서, 원할한 서비스가 제공 될 수 있도록 하였다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.3 s.345
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• pp.10-17
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• 2006

For orthogonal frequency division multiplexing (OFDM), cyclic prefix (CP) should be longer than the length of channel impulse response, resulting in a loss of bandwidth efficiency. In this letter, the CP reconstruction (CPR) technique is first applied to a multi-input multi-output (MIMO)-OFDM system with insufficient CP. The intercarrier interference (ICI) from multiple transmit antennas is so large for MIMO system that it can not be sufficiently suppressed with the conventional CPR procedure used in single-input single-output (SISO) system. A new minimum mean-square error (MMSE) equalization and ordering process is proposed for MIMO system to suppress the ICI during the CPR procedure. By applying the proposed CPR algerian to MIMO-OFDM system, we can obtain both the benefits of multiplexing gai and spectral efficiency gain.

• Korean Journal of Construction Engineering and Management
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• v.13 no.4
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• pp.89-99
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• 2012

Urban regeneration projects tingeing the shape of mixed-use development, due to the nature of the business, involve risk factors such as protracted business conflict among participations, subjects, complex approval and permission procedure, frequent policy changes, etc. Therefore, systematic risk management is needed to effectively manage the numerous risk factors that may occur during the process course of project. However, risk management of large and complex development projects such as urban regeneration projects is in the introduction stage yet and somewhat one time risk management plan has been established. Therefore, in this study, in order to systematic risk management of urban regeneration projects inhered numerous risk factors, risk factors for urban regeneration projects through preceding studies and case studies were presented. Also risk factors are classified in accordance with business propulsion phase, by estimating the importance for these, step by step emphasis on managed subjects of risk management was proposed.

• Korean Journal of Microbiology
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• v.30 no.3
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• pp.154-159
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• 1992

Forniation ancl ~regcncration oi' conitlial pro1oplast of Pc, ti~i.rlli~in~~~ c~rr~~culo.hryupmel.- - czllulolytic Ihngus. were examined. By using Novozyme 134(1'!/0 w/c) as a cell wall lytic enzyme. the highest yield of protopl;~sts exceeding 501%, war obtained from the qwollen conidiosporcs preincubatrd in the minimal medium containing 2-tleoxy-D-glucose(2-UC;. 75 pglml) for 10-11 11. No protoplast were obtained horn dormant spores. The regeneration frequency of the protoplasts was 49.2'!11. which was higher than that of mycclium originated protoplast (4.6-17.X1X, . in 0.6 M MgS04. pH 5.6). 'l'lie best osmotic stahilizcr ror the isoaltion and regcueration of thc protoplast was 0.6 M iimmonium sulfatc and 0.6 M magnesiuni sulfhte. respectively. 'I'lie process of the protoplast isolaiton l'ro~n swollen cnnirliospore ancl regeneration ha\, ing two pattcrns from protoplast were obsen'etl through light microscope.

• The Journal of the Korea Contents Association
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• v.17 no.3
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• pp.129-137
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• 2017

As the city continues to breed a variety of problems in the development process, in order to prevent the city's decline, the issue of urban regeneration is placed in the significant position among cities' problems. Based on the background of urban regeneration, this paper discussed the research status of urban regeneration in the current stage in various countries and obtained high value cases for analysis through the screening and evaluation. Through the analysis of the cases, outstanding measures had been acquired in developed countries on the urban regeneration. The essence and possibility of urban regeneration solutions had been explored from different angles. Finally, the key points of urban regeneration program solutions had been obtained to make the city keep a longer life and more vitality.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.11
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• pp.3269-3273
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• 2009

In this study, recycling methods of nano $TiO_2$-coated silica-bead were conducted in order to solve a deactivation problem of bead that had been invented for decomposition of pollutants in aqueous solution. Surface cleansing was selected as the recycling method for used beads. The surface cleansing was done with four different solutions such as distilled water, surfactant, acetone, and ethyl alcohol(ethanol). The recycling process consists of cleansing and calcination. After cleaning the used (deactivated) beads, calcination was done at $100^{\circ}C$, $200^{\circ}C$ and $300^{\circ}C$ for 30 minutes, respectively. This process was repeated three times. The activity of the recycled bead was measured by photo-degradation of methylene blue. The result shows that acetone cleansing and calcination at $100^{\circ}C$ for 30 minutes was the most efficient recycling method.

• The Journal of the Korea Contents Association
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• v.22 no.8
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• pp.367-376
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• 2022

In this study, changes in commercial areas in Yeongdo-gu urban regeneration region were analyzed in terms of regional revitalization. Urban decline can accelerate the decline of downtown commercial functions, and revitalization of stagnant areas can be evaluated as enhancing the vitality of commercial areas. To reach this objective, dynamic changes in the commercial area in urban regeneration region were confirmed through store density, industry diversity, and restaurant/cafe ratio. As a result of the study, it was found that the store density and industry diversity showed an increasing trend in Yeong-do urban regeneration region. Although it is difficult to find a substantial difference in the ratio of restaurant/cafe, it seems that Yeongseon 2-dong has undergone a relatively large commercial change. This research is significant in that it quantitatively evaluated and analyzed commercial changes in Yeongdo-gu urban regeneration region.

• Applied Microscopy
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• v.29 no.2
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• pp.201-209
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• 1999

Remodeling of epithelial cells during wound healing in the skin of the Korean fire-bellied toad, Bombina orientalis, were examined using the scanning and transmission electron microscopical analyses. Artificial wounds were induced on the dorsal surface of the skin by excision, and reared in special cages with normal diets for up to 31 days after injury. From 4 days after wounding, regenerated epithelial cells are more rapidly migrated to wounding area, and remodeling of tissue components are proceeded gradually. Especially, formation of basal lamina between regenerated epithelium and dermis, and reconstruction of cellular junctions such as desmosomes (among the regenerated epithelial cells) and hemidesmosomes (between basal epithelial cells and basal lamina) are detected through fine structural analysis from 10 days after injury. Parakeratosis of regenerated epithelial cells observed during 16 to 19 days after wounding.