• 디지털융복합연구
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• 제18권8호
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• pp.459-467
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• 2020

현대 장신구를 제작하는 작가의 입장에서 초연결시대속 현대장신구의 미래를 보고자 했다. 특히 그중 하나인 정보통신 기술, 그중에서도 nfc Tag을 응용한 기술융합의 실제적 방안을 찾고자 한다. 그 실제적인 접근을 위해 현재 nfc Tag기술이 활용된 상업적반지제품들의 실예를 살펴본 후 이후 공방에서 제작되는 현대장신구에도 적용가능한 실제적 방법을 찾고자 했다. 그 결과 비교적 융합이 자유롭지만 기술적 활용도가 제한되는 매몰법과 기술적 활용도는 높지만 디자인 기획 단계부터 융합을 고려해야하는 조립법의 현실적 대안을 도출하였으며 특히 그중 실제적용에 차이가 있을 수 있는 매몰법을 개념만이 아니라 샘플제작을 통해 기술적용에 있어 필요한 요소와 주의점등을 기술하였다.

• International journal of advanced smart convergence
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• 제8권1호
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• pp.65-74
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• 2019

3D file formats typically include OBJ (Wavefront file format), STL (STereoLithography), and FBX (Filmbox). Each format has limitations depending on its configuration and usage, and supported formats are different depending on the software application. glTF helps uniform integration of 3D file formats and allows for more efficient transmission of large 3D geometry files by organizing them in a binary format. This paper presents explanation on OBJ, FBX, and STL which are major examples of existing 3D file formats. It also explains the concept and characteristics of glTF and compares its performance with other 3D file formats on the web. The loading time and packets of each 3D file format are measured according to the web browser environment by means of Google Chrome, Firefox and Microsoft Edge. Experimental results show that glTF is the most efficient and that it exhibits the best performance. As to STL, relatively excessive traffic was observed. This study is expected to contribute to reducing rendering time on the web as 3D file formats are used.

• 한국정밀공학회지
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• 제28권4호
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• pp.513-520
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• 2011

The NIL processes have been studied to implement low cost, high throughput and high resolution application. A RNIL(roller NIL) is an alternative approach to flat nanoimprint lithography. RNIL process is necessary to transfer patterns on flexible substrates. Compared with flat NIL, RNIL has the advantages of better uniformity, less pressing force, and the ability to repeat the patterning process continuously on a large substrate. This paper studies the design, construction and verification of a thermal RNIL system. The proposed RNIL system can easily adopt the flat shaped hot plate which is one of the most important technologies for NIL. The NIL system can be used to transfer patterns from a flexible stamp to a flexible substrate, from a flexible stamp to a Si substrate, and from a roller stamp to a flexible substrate, etc. Patterning on flexible substrates is one of the key technologies to produce bendable displays, solar cells and other applications.

• 디지털융복합연구
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• 제10권6호
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• pp.213-218
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• 2012

현대문학은 사회적 배경에 따라 그 시대적 상황을 표현하여 왔다. 즉 시대가 변하면 문학작품도 변화를 가져왔다. 따라서 우리는 현대문학을 통해 그 시대를 이해할 수 있고, 그 시대의 사회적 요구를 습득할 수 있다. 이러한 문학작품들은 정보통신의 발달에 따라 미디어 매체로 제작됨으로서 사용자들에게 보다 가까이 접근하는 계기를 만들어 주고 있다. 최근, IT 융합, 디지털 융합이라는 새로운 학문의 기류는 서로 다른 학문분야를 접목하여 보다 많은 시너지 효과를 가져 오고 있다. 따라서 본 논문은 현대문학작품들을 디지털화 하는데 필요한 온톨로지를 설계하고자 한다. 이를 위하여 시대별 문학작품의 구조를 분석하고 각 요소들과의 관계를 명세한다. 명세의 방법은 토픽맵을 이용하였다. 또한 각 관계 모델은 토픽벡터를 통해 연결을 명세하였다.

• 한국컴퓨터정보학회논문지
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• 제22권1호
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• pp.57-62
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• 2017

Children need oral care according to their developmental stage and accordingly, the appropriate dental treatment is different, which requires parents to have an active attitude and the applicable oral knowledge. As there is so much unreliable oral care information and PR, it is hard to find accurate information and parents are in need of a preventative oral healthcare mobile application for healthy oral care. Also, pediatric adolescent care should be focused on prevention rather than treatment and children should be instructed and educated to eat cariogenic foods as little as possible as well as told to brush before going to bed. This study designed a smart application for oral health care education to provide information and knowledge regarding oral health care for infants, oral health education, and oral health care prevention for parents of young children.

• ETRI Journal
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• 제43권5호
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• pp.916-922
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• 2021

We calculated the correlation between the doping concentration of the charge layer and the multiplication layer for separate absorption, grading, charge, and multiplication InGaAs/InAlAs avalanche photodiodes (APDs). For this purpose, a predictable program was developed according to the concentration and thickness of the charge layer and the multiplication layer. We also optimized the design, fabrication, and characteristics of an APD for 20 Gbps application. The punch-through voltage and breakdown voltage of the fabricated device were 10 V and 33 V, respectively, and it was confirmed that these almost matched the designed values. The 3-dB bandwidth of the APD was 10.4 GHz, and the bit rate was approximately 20.8 Gbps.

• 한국멀티미디어학회논문지
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• 제13권6호
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• pp.865-874
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• 2010

Recently, Hao et al. proposed a privacy preservation protocol based on group signature scheme for secure vehicular communications to overcome a well-recognized problems of secure VANETs based on PKI. However, although efficient group signature schemes have been proposed in cryptographic literatures, group signature itself is still a rather much time consuming operation. In this paper, we propose a more efficient privacy preservation protocol than that of Hao et al. In order to design a more efficient anonymous authentication protocol, we consider a key-insulated signature scheme as our cryptographic building block. We demonstrate experimental results to confirm that the proposed protocol is more efficient than the previous scheme.

• 한국레이저가공학회지
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• 제18권3호
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• pp.6-8
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• 2015

Finishing process includes deburring, polishing and edge radiusing. It improves the surface profile of specimen and eliminates the alien substance on surface. Deburring is the elimination process for debris of edges. Polishing lubricates surfaces by rubbing or chemical treatment. There are two types for electron finishing. The one is using pulse beam. The other is using the convergent and scanning electron beam. Pulse type device appropriates the large area process. But it does not control the beam dosage. Scanning type device has advantages for dosage control and edge deburring. We design the convergence and scan type. It has magnetic lenses for convergence and scan device for scanning beam. Magnetic lenses consist of convergent and objective lens. The lenses are designed by the specification(beam size and working distance). In this paper, we evaluate the convergence performance by pattern process. Also, we analysis the results and important factors for process. The important factors for process are beam size, pressure, stage speed and vacuum. These results will be utilized into systematizing pattern shape and the factors.

• 디지털융복합연구
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• 제14권7호
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• pp.397-402
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• 2016

본 연구는 그라피티(Graffiti)를 동두천 구시가지에 적용하여 도시를 재생시키고, 더 나아가 그것을 도시의 정체성으로 연결시키는 도시 문화콘텐츠 융합 디자인 방안에 대해 논의하였다. 연구를 위해 세 가지 방법을 이용하였다. 먼저 동두천의 정체성 배경과 문화자산을 조사해보고 정체성이 잘 드러나는 장소를 분석하였으며 그리고 관내 대학을 다니는 대학생들을 대상으로 인터뷰를 실시하였다. 조사 결과, 도시 정체성 강화 방안으로서 그라피티 활용에 대한 긍정적 반응을 얻었다. 동두천에 미군이 주둔하면서 만들어진 이국적 이미지는 도시의 정체성을 결정짓는 중요한 요인으로 평가된다. 락 페스티벌은 미군 주둔에 따른 문화적 영향으로 자리를 잡게 된 동두천의 대표적인 문화자산으로서 도시 정체성을 결정짓는 요소 중 하나이다. 이러한 문화자산과 자연스럽게 어울리고 도시 정체성을 더욱 강화할 수 있는 요소로서 그라피티라는 시각문화가 제시되었다. 연구 결과에서는 동두천시의 정체성 변화와 도시재생 효과, 그리고 무공해 문화 창조의 도시 이미지 부각 효과를 기대하면서 그라피티를 활용하는 방안에 대해 제안하였다.

• 한국기계가공학회지
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• 제2권2호
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• pp.91-97
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• 2003

In rigid-plastic finite element method, there is a heavy computation time and convergence problem. In this study, revised rigid-plastic finite element method Will be introduced. This method is the way that restrict the convergence interval. In result, convergence problem and computation time due to large non-linearity in the existing numerical analysis method were no longer a critical problem. It is expected that various results from the numerical analysis will give very useful information for the design of tools in sheet metal forming process.