• Korean Journal of Construction Engineering and Management
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• v.11 no.6
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• pp.111-121
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• 2010

As the customer's interest for sidewalk block in the street or apartment complex is increasing, the materials of block which had been a concrete block exclusively are varied to clay paver, native rock and wood etc. Especially, the sales volume of clay paver which is environment-friendly and ergonomic is dramatically increasing every year with two digits growth rate, however, many problems like "Edge Cracking" "Freezing Breakage" "Bending Breakage" "Joint Gap" are happening frequently within a couple of hours after installation due to the durabilities. Because of the characteristics of Ceramic products, clay pavers are very easy to be broken when they are bumped against each other. In addition, they are relatively fragile by a freezing expansion breakage when exposed to water due to hydrophilic property as well as the intensity and absorptance of the products are varied with small difference from the production process such as production equipment and process control. Therefore, it costs a lot of money to repair the breakdown unless production and installation is carried out according to the strict criteria of the quality control. In this study, the symptoms of breakdown frequently happened in clay paver are classified by each type and finally the solution for this problem in the production of brick, installation and criteria of quality control through compressive strength and absorptance test is suggested.

• Journal of Mushroom
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• v.11 no.1
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• pp.21-23
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• 2013

We aim at providing consumers and farmers with various parts of mushrooms through development of new mushroom cultivation. For the mass artificial cultivation, we elucidated suitable environment conditions of Neolentinus lepideus. The results were summarized as follows. For the efficient cultivation of N. lepideus, temperature of mycelial growth and development of the fruit body were suitable $20{\sim}23^{\circ}C$ and $20^{\circ}C$, respectively.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.257-257
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• 2011

현재의 평판 디스플레이를 대체할 차세대 정보전달 매체로서 플랙서블 디스플레이가 부각되고 있다. 이러한 플렉서블 디스플레이의 발전과 함께 터치스크린 패널 또한 같은 방향으로 연구 개발이 필요하다. 플렉서블 터치 스크린 패널의 연구에서 가장 큰 문제는 ITO의 휨에 따른 깨짐 현상으로 인한 전기적 특성의 저하이다. 이 논문에서는 현재 터치 스크린 패널로 사용되는 ITO/PET 샘플과 ITO/PET 를 패터닝한 그 위에 PEDOT을 증착한 구조를 전기적, 기계적, 광학적 특성을 비교하였다. 실험진행은 샘플의 면저항 및 투과도, hall measurement 측정을 진행하였고, 추가적으로 샘플의 Bending test를 통해 bending 횟수에 따른 박막의 특성을 분석하였다. 측정 결과, ITO/PET 와 PEDOT/patterned ITO/PET 샘플의 면저항은 400${\Omega}/{\Box}$, 424${\Omega}/{\Box}$로 큰 변화가 없었으며, hall 측정결과 중에서 carrier concentration은 2.8${\times}$1,020/cm-3, 4.492${\times}$1,021/cm-3로 증가 하였다. 투과도를 측정한 결과 97.6%, 96% 정도로 큰 변화는 없었다. 하지만, bending 횟수에 따른 면저항 특성의 변화 측정 결과 PEDOT/patterned ITO/PET 샘플의 면저항 변화가 기존의 ITO/PET 샘플의 면저항 변화와 비교하여 거의 변화가 없어, 기계적 특성에서 우수한 특성을 확인 할 수 있었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.299-301
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• 2013

지속적인 정보기술의 발전은 사회를 성장시킴과 동시에 사용자에게 더 많은 정보와 요구사항을 발생시킨다. 이에 따라 최근 디지털 융합 기술에 대한 관심이 높아지고 있으며 학문 분야에서의 디지털 융합은 새로운 학문으로서 다양한 방안으로 활용될 수 있다. 전자문화지도는 전자지도상에 문화정보를 디지털화하여 표현한 것이다. 세부적으로 점, 선, 면의 공간데이타와 연계하여 문화정보를 나타낼 수 있으며 시간, 공간(지도), 주제(문화) 세 가지 축을 기반으로 문화정보를 다양하게 표현할 수 있다. 따라서 전자문화지도는 인문 지역 연구를 위한 방법으로 활용될 수 있으며 결과물을 전자문화지도를 통해 전시함으로써 연구결과를 확산시킬 수 있다. 기존의 전자문화지도는 2차원 형태의 이미지 지도를 기반으로 하는 것이 대부분이다. 그러나 이 방법은 지역이나 공간에 대한 입체적이고 사실적인 정보제공이 어렵고 지도 확대 시 이미지 깨짐 현상과 같은 문제점이 발생한다. 본 논문에서는 이러한 문제점 해결하기 위하여 3차원 지도 서비스인 구글어스(Google Earth)를 활용하여 지역연구를 위한 전자문화지도를 설계 및 구현한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.2B
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• pp.133-142
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• 2007

WPANs are formed in relatively small area and a PNC that serves as a central control device plays an important role in the operation and organization of a piconet. Typical applications of WPANs are security system and health monitoring system. In these type of systems, guaranteeing realtime service is very important, and communications cannot take place when the PNC malfunctions. Thus, in this situation, it is necessary to elect a new PNC as soon as possible. For this reason, we propose distributed PNC election scheme that considers not only QoS support but also network connectivity to avoid possible network partition. Simulation results show proposed mechanism can select PNC with guaranteeing QoS and connectivity for a limited period.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.72-74
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• 2021

Recently, the spread of deep learning environments has increased the importance of dataset generation. Therefore, data is being augmented using GAN for efficient data set generation. However, several problems have been found in data generated using GAN, such as problems that occur in the early stages of learning and pixel breakage occurring in the generated image. In this paper, we intend to implement an image data selection algorithm to solve various problems arising from the existing GAN. The broken image screening algorithm was implemented to analyze the histogram distribution in the image and determine whether to store the generated image according to whether the result value satisfies the specified threshold value.

• Journal of the Korean Society of Radiology
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• v.17 no.5
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• pp.651-662
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• 2023

In this study, we designed and fabricated an ultra-compact CT that automatically calibrates the detector's center axis and verified its performance. The three-dimensional reconstruction performance was evaluated using 3D CAD data and X-ray data acquired by manually calibrating the center axis of the CT detector. The results showed that tilting the center axis by more than 0.25° causes circle break phenomenon, which rapidly degrades the quality of the 3D reconstructed image. By applying the automatic calibration device of a detector center axis, the 3D reconstruction performance was enhanced by calibrating the detector center axis to match the specimen rotation axis.

• Journal of the Korea Computer Graphics Society
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• v.24 no.3
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• pp.101-109
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• 2018

Recently, the improvement of virtual reality and augmented reality technologies leverages many new technologies like the virtual study room, virtual architecture room. Such virtual worlds require free handed drawing technology such as writing descriptions of formula or drawing blue print of buildings. In nature, lots of view point modifications occur when we walk around inside the virtual world. Especially, we often look some objects from near to far distance in the virtual world. Traditional drawing methods like using fixed size image for drawing unit is not produce acceptable result because they generate blurred and jaggy result as view distance varying. We propose a novel method which robust to the environment that produce lots of magnifications and minimizations like the virtual reality world. We implemented our algorithm both two dimensional and three dimensional devices. Our algorithm does not produce any artifacts, jaggy or blurred result regardless of scaling factor.

• Journal of Mushroom
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• v.13 no.2
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• pp.135-138
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• 2015

'Daejang 3ho' is a new cultivar of oyster mushroom for high productivity than that of Chunchu 2ho. This cultivar was bred by Di-mon mating between monokaryotic strains isolated from 'Daejang 1ho' and dikaryotic strain 'Jangan 5ho'. The color of pileus and the shape of pileus of new cultivar were dark gray and deeply funnel shape, respectively. The length and thickness of stipe were longer and thicker than those of Chunchu 2ho. It took 4~5 days to formation of primordia, that was a similar to Chunchu 2ho. The optical temperature of fruit body was $14-17^{\circ}C$. Yield of 'Daejang 3ho' was 13.9% higher than that of Chunchu 2ho. Analysis of RAPD by URP-primer of #03, #08, #10 and #11 showed that different band pattern those of other strains. There were no significant differences between the texture properties of 'Daejang 3ho' and Chunchu 2ho.

• Journal of KIISE:Computer Systems and Theory
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• v.35 no.4
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• pp.166-171
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• 2008

We studied the variety and affinity between the successive words in the text document A number of groups were defined by the frequency of a following word in the whole text (corpus). In the previous studies, the Zipf's power law was explained by Chinese restaurant process and hub node was searched after by examining the edge number profile in scale free network. We have observed both a power law and a hub profile at the same time by studying the conditional frequency and degeneracy of a group. A symmetry between the affinity and the variety between words were found during the data analysis. And this phenomenon can be explained within a viewpoint of "exploitation and exploration." We also remark on a small symmetry breaking phenomenon in TIPSTER data.