• Smart Structures and Systems
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• 제24권5호
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• pp.649-657
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• 2019

Recently, an advanced video deflectometer based on the principle of off-axis digital image correlation was presented and advocated for remote and real-time deflection monitoring of large engineering structures. In engineering practice, measurement accuracy is one of the most important technical indicators of the video deflectometer. However, it has been observed in many outdoor experiments that data drift often presents in the measured deflection-time curves, which is caused by the instability of imaging system and the unavoidable influences of ambient interferences (e.g., ambient light changes, ambient temperature variations as well as ambient vibrations) in non-laboratory conditions. The non-ideal unstable imaging conditions seriously deteriorate the measurement accuracy of the video deflectometer. In this work, to perform high-accuracy deflection monitoring, potential sources for the drift error are analyzed, and a drift error model is established by considering these error sources. Based on this model, a simple, easy-to-implement yet effective reference point compensation method is proposed for real-time removal of the drift error in measured deflections. The practicality and effectiveness of the proposed method are demonstrated by in-situ deflection monitoring of railway and highway bridges.

• The Journal of Advanced Prosthodontics
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• 제14권6호
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• pp.388-398
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• 2022

PURPOSE. This in vitro study aimed to evaluate the accuracy of 14 different intraoral scanners for the All-on-4 treatment concept. MATERIALS AND METHODS. Four implants were placed in regions 13, 16, 23, and 26 of an edentulous maxillary model that was poured with scannable Type 4 gypsum to imitate the All-on-4 concept. The cast was scanned 10 times for each of 14 intraoral scanners (Primescan, iTero 2, iTero 5D, Virtuo Vivo, Trios 3, Trios 4, CS3600, CS3700, Emerald, Emerald S, Medit i500, BenQ BIS-I, Heron IOS, and Aadva IOS 100P) after the polyether ether ketone scanbody was placed. For the control group, the gypsum model was scanned 10 times with an industrial scanner. The first of the 10 virtual models obtained from the industrial model was chosen as the reference model. For trueness, the data of the 14 dental scanners were superimposed with the reference model; for precision, the data of all 14 scanners were superimposed within the groups. Statistical analyses were performed using the Kolmogorov-Smirnov, Shapiro-Wilks, and Dunn's tests. RESULTS. Primescan showed the highest trueness and precision values (P < .005), followed by the iTero 5D scanner (P < .005). CONCLUSION. Some of these digital scanners can be used to make impressions within the All-on-4 concept. However, the possibility of data loss due to artifacts, reflections, and the inability to combine the data should be considered.

• International journal of advanced smart convergence
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• 제11권2호
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• pp.118-127
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• 2022

Barrage language is a new media language based on Internet video. It is a representative expression of the Internet environment regardless of its format and content. As a unique movie viewing characteristic provided by the barrage function, the timeliness of feedback, entertainment, and interactivity of the content are excellent. Characteristic. Barrage language itself is closely related not only to the value of linguistic research, but also to the spread of the Internet in the Internet environment. Based on the current situation of Chinese video sites, this thesis explores how Barrage is an organic cycle of culture and consumption in a specific platform and group, and analyzes its propagation methods and effects. By analyzing the characteristics of content production patterns unique to the barrage culture, implications and reference values for production activities of other cultures, the effect of popularization on viewers and the production and consumption of the 'barrage' culture of the industry is studied, and furthermore, the 'barrage' culture is It was designed to be a reference for the development of the platform, internet culture, and animation industry culture.

• 디지털융복합연구
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• 제18권9호
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• pp.363-371
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• 2020

패션산업의 디지털 혁신을 배경으로 한 본 연구는 소셜 미디어를 통해 이미 전 세계 많은 사용자들을 확보하며 패션산업에까지 영향을 미친 디지털 기반의 페이스디자인에 대하여 연구하였다. 이에 증강현실 기반의 디지털 페이스디자인의 대표적 사례들을 유형화하고 이를 관통하는 지향 가치를 도출함으로써 향후 패션산업의 전개 방향에 대한 미래 비전을 제시하고자 하는 목적을 갖는다. 인스타그램과 페이스북을 통해 대중에게 디지털 필터 기반의 페이스디자인을 제공하는 3D 디자이너 작품들을 연구대상으로 분석하였다. 사례 탐색을 통해 현대패션의 관점에서 디지털 페이스디자인의 지향 가치를 관찰한 결과 실험적 조형 지향, 유희적 경험 지향, 미래적 기술 지향 등의 세 가지 경향이 도출되었다. 본 연구는 디지털 기반의 페이스디자인으로 범위를 한정한 것이나, 이를 통해 나타난 결론들은 패션의 전 분야에 적용될 수 있는 사항들이다. 이에 앞으로 페이스디자인의 범위를 넘어선 디지털 증강현실 기반의 패션디자인과 패션커뮤니케이션 관련의 새로운 현상에 대한 연구를 기대할 수 있다.

• 실천공학교육논문지
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• 제15권3호
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• pp.597-603
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• 2023

본 연구는 교원의 AI디지털역량을 평가하고 연수에 활용할 수 있는 교원의 AI디지털 역량에 대한 단계별 프레임워크 개발에 대한 것이다. 이를 위해 AI디지털역량에 대해 활용과 소양의 관점을 테크놀로지컬교수내용지식(TPACK)의 관점과 연계하여 분석하였다. 그리고 단계별 교원의 AI디지털 역량 선행연구 사례로 영국교육훈련재단의 3단계 역량, 유네스코 ICT 교사 역량 프레임워크 등을 제시하였다. 그리고 본 연구에서는 선행연구와 국내의 여건을 고려하여 교원의 AI디지털 역량을 진입, 적응, 선도의 3단계로 구분하여 제시하였다. 최초 진입단계는 2차에 델파이 조사를 통과하였으며 그 외 2개 단계는 1차에서 통과하였다. 최종 진입단계는 AI디지털에 대해 이해는 하였지만, 실천에 어려움을 겪는 단계, 적응단계는 표준교육과정에 적용하는 수준, 선도단계는 심화과정에 AI디지털 적용과 타 교사에게 모델이 되는 수준으로 기술하였다. 본 연구에서 제시한 총괄 AI디지털 역량을 통하여 세부적인 역량 개발이 가능하며 평가문항개발의 참고자료로 이용할 수 있다.

• 한국IT서비스학회지
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• 제19권6호
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• pp.177-189
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• 2020

The OECD has assessed Korea as the third highest in trade facilitation worldwide. The paperless trade of Korea is world class based on uTradeHub : national e-trade service's infrastructure for trade community. Over 800 trade-related document standards provide interoperability of message exchange and trade process automation among exporters, importers, banks, customs, airlines, shippers, forwarders and trade authorities. Most one-to-one unit processes are perfectly paperless & online; however, from the perspective of process flow, there is a lack of streamlining end-to-end trade processes spread over many different parties. This situation causes the trade community to endure repetitive-redundant load for handling trade documents. The trade community has a strong demand for seamless trade flow. For streamlining the trade process, processes with data should flow seamlessly to multilateral parties. Flowing data with an optimized process is the critical success factor to accomplish seamless trade. This study proposes four critical digital trade infrastructures as a platform service : (1) data-centric Intelligent Document Recognition(IDR), (2) data-driven Digital Document Flow (DDF), (3) platform based Digital Collaboration & Communication(DCC), and (4) new digital Trade Facilitation Index (dTFI) for precise assessment of K-Trade Digital Trade Framework. The results of new dTFI analyses showed that redundant reentry load was reduced significantly over the whole trade and logistics process. This study leads to the belief that if put into real-world application can provide huge economic gains by building a new global value chain of the K-trade eco network. A new digital trade framework will be invaluable in promoting national soft power for enhancing global competitiveness of the trade community. It could become the advanced reference model of next trade facilitation infrastructure for developing countries.

• Journal of Information Science Theory and Practice
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• 제10권1호
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• pp.1-17
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• 2022

The article reports the results of an investigation on the practice of providing digital scholarship services at Vietnam National University Ho Chi Minh City, Vietnam. This study is part of an ongoing research project entitled Developing a digital scholarship service framework for universities at Vietnam National University Ho Chi Minh City. It employed a qualitative research approach through in-depth interviews with 31 individuals who are university managers, library managers, lecturers, and postgraduate and undergraduate students from six member universities and Central Library of Vietnam National University Ho Chi Minh City. Research results show that some digital scholarship services have been provided at Vietnam National University Ho Chi Minh City. However, they have not been yet systematically implemented and have not met users' needs. Lack of needed resources such as space, technology infrastructure, human resources, finance, and stakeholder support are among major challenges in developing digital scholarship services. The management of existing digital scholarship services is fragmented without a clear policy for developing digital scholarship and supporting services. The study contributes to the existing knowledge by adding substantially to current understanding of the practice of providing digital scholarship services in Vietnam's universities in the transition period, from state control to autonomy, which has not been much addressed in previous research. Furthermore, this study can be a useful reference for higher education institutions in developing countries regarding implementation of digital scholarship services.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.976-979
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• 2002

A new controller for switching audio power amplifier with digital PWM input is proposed- Bi-directional Saw-tooth Error Correction (BSEC). This control method for high quality switching amplifier is based on a pulsed edge correction approach using PWM audio signal input as a reference of power switching digital to analog converter. The proposed controller has excellent features such as wide error correction range and no limitation on the modulation index. The controller is implemented in the half-bridge class D amplifier and the performance is verified through hardware experiments. It delivers 100W into 4${\Omega}$ load with less than 0.2% of total harmonic distortion (THD) all over operating range and an maximum efficiency of 82%.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2005년도 종합학술발표회 논문집 Vol.15 No.1
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• pp.39-44
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• 2005

A broadband DC to 40 GHz 5-bit MMIC digital attenuator has been developed. The ultra broadband attenuator has been achieved by newly inserted the transmission lines in conventional Switched-T attenuator and the optimization of the transmission line parameters. Momentum was employed in design for an accurate performance prediction at high frequencies and Monte Carlo analysis was applied to verify performance stability against the MMIC process variation. The attenuator has been fabricated with 0.15 $\mu$m GaAs pHEMT process. This attenuator has 1 dB resolution and 23 dB dynamic range. High attenuation accuracy has been achieved over all attenuation range and full 40 GHz bandwidth with the reference state insertion loss of less than 6 dB at 20 GHz. The input and output return losses of the attenuator are better than 14 dB over all attenuation states and frequencies.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2013년도 하계학술대회
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• pp.338-341
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• 2013

본 논문에서는 동일 주파수 대역 내 DRM(Digital Radio Mondiale) Plus 신호와 FM(Frequeny Modulation) 신호가 모두 서비스 되는 Hybrid 방송 모드에 적합한 DRM Plus 신호 검출 기법을 제안한다. OFDM(Orthogonal Frequency Division Multiplexing) 신호의 Guard-Interval 상관 기법을 그대로 적용할 경우 DRM Plus 신호 검출 성능은 우수하나, FM 신호 수신 시 False Alarm 발생 확률이 증가하는 문제점이 발생한다. 제안한 방법은 Guard-Interval 상관 방법에 Reference 블록을 포함하고 있어, 약한 DRM Plus 신호에서도 판별 확률이 높고, 아날로그 FM 신호 수신 시 False Alarm이 발생할 확률이 낮은 특징이 있다. 모의 실험을 통하여 제안한 기법의 성능을 확인한다.