• ETRI Journal
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• 제25권2호
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• pp.73-80
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• 2003

This paper describes an effective method for forming silicon oxide on silica-on-silicon platforms, which results in excellent characteristics for hybrid integration. Among the many processes involved in fabricating silica-on-silicon platforms with planar lightwave circuits (PLCs), the process for forming silicon oxide on an etched silicon substrate is very important for obtaining transparent silica film because it determines the compatibility at the interface between the silicon and the silica film. To investigate the effects of the formation process of the silicon oxide on the characteristics of the silica PLC platform, we compared two silicon oxide formation processes: thermal oxidation and plasma-enhanced chemical vapor deposition (PECVD). Thermal oxidation in fabricating silica platforms generates defects and a cristobalite crystal phase, which results in deterioration of the optical waveguide characteristics. On the other hand, a silica platform with the silicon oxide layer deposited by PECVD has a transparent planar optical waveguide because the crystal growth of the silica has been suppressed. We confirm that the PECVD method is an effective process for silicon oxide formation for a silica platform with excellent characteristics.

• 한국IT서비스학회지
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• 제20권5호
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• pp.147-158
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• 2021

The digital transformation and COVID-19 are also causing major changes in teaching-learning methods. The biggest change is the spread of remote training and the emergence of various innovative learning platforms. Distance education has been criticized for not meeting technology trends and field demands..However, the problem of distance education is being solved through a system that supports various interactions and collaborations and supports customized learning paths. The researcher conducted a case study on domestic and foreign learning platforms that provide non-face-to-face ICT education. Based on the case study results, the researcher presented the functional characteristics of a learning platform that effectively supports non-face-to-face learning. In common, these sites faithfully supported the basic functions of the information system. In addition to learning progress check and learning guidance, some innovative learning platforms were providing differentiated functions in practice support, performance management, mentoring, learning data analysis, curation provision, and CDP support. Most learning platforms supported one-way, superficial interaction. If the platform effectively supports a variety of learning experiences and provides an integrated learning experience thanks to the development of IT technology, user satisfaction with the learning platform, intention to continue learning, and achievement will increase.

• Ocean Systems Engineering
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• 제14권1호
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• pp.1-16
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• 2024

This paper investigates the impact of local joint flexibility (LJF) on the fatigue life of jacket-type offshore platforms. Four sample platforms with varying geometric properties are modeled and analyzed using the Opensees software. The analysis considers the LJF of tubular joints through the equivalent element and flexible link approaches, and the results are compared to rigid modeling. Initially, modal analysis is conducted to examine the influence of LJF on the frequency content of the structure. Subsequently, fatigue analysis is performed to evaluate the fatigue life of the joints. The comparison of fatigue life reveals that incorporating LJF leads to reduced fatigue damage and a significant increase in the longevity of the joints in the studied platforms. Moreover, as the platform height increases, the effect of LJF on fatigue damage becomes more pronounced. In conclusion, considering LJF in fatigue analysis provides more accurate results compared to conventional methods. Therefore, it is essential to incorporate the effects of LJF in the analysis and design of offshore jacket platforms to ensure their structural integrity and longevity.

• 한국의류산업학회지
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• 제24권4호
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• pp.386-398
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• 2022

This study was conducted to corroborate the factors that influence consumer characteristics and technology acceptance on online luxury platforms, which are rapidly emerging as distribution channels for luxury brands. To this end, the relationship between the degree of technology acceptance and behavioral intention of fashion consumers on online luxury platforms and the effect on specific factors such as age and gender was investigated to see if there was a difference in behavior and use behavior. A survey was conducted on Korean consumers between the age of 20 and 40 who have used online luxury platforms and then, a statistical analysis was conducted. As a result of the study, performance expectancy and facilitating conditions, hedonic motivation, price value, and habit were found to have a significant effect on platform behavioral intention, but effort expectancy and social influence did not have a significant effect. Additionally, both facilitating conditions and habit were found to have a directly significant effect on the platform use behavior, and it was confirmed that the platform behavior intention also had a significant effect on the use behavior. As a result of confirming the moderating effect of gender and age, there was no difference based on gender, but only the relationship between price value and behavioral intention was found to have a moderating effect. It is hoped that domestic online luxury platforms will grow into channels with distinct characteristics and continue to develop in the luxury market by utilizing specific affect factors of this study.

• International Journal of Computer Science & Network Security
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• 제24권3호
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• pp.71-82
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• 2024

This paper proposes a new communication system for e-learning applications to mitigate the negative impacts of COVID-19 where the online massive demands impact the current commu-nications systems infrastructures and capabilities. The proposed system utilizes high-altitude platforms (HAPs) for fast and efficient connectivity provision to bridge the communication in-frastructure gap in the current pandemic. The system model is investigated, and its performance is analyzed using adaptive antenna arrays to achieve high quality and high transmission data rates at the student premises. In addition, the single beam and multibeam HAP radio coverage scenarios are examined using tapered uniform concentric circular arrays to achieve feasible communication link requirements.

• International Journal of Advanced Culture Technology
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• 제7권3호
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• pp.143-148
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• 2019

In order to solve the urban problems caused by the increase of the urban population, the construction of smart city applying the latest technology is being carried out all over the world. In particular, we will create a smart city platform that utilizes data generated in the city to collect and store and analyze, thereby enhancing the city's continuous competitiveness and resilience and enhancing the quality of life of citizens. However, existing smart city platforms are not enough to construct a platform for smart city as a platform for solution elements such as IoT platform, big data platform, and AI platform. To complement this, we will reanalyze the existing overseas smart city platform and IoT platform in a comprehensive manner, combine the technical elements applied to it, and apply it to the future Korean smart city platform. This paper aims to investigate the trends of smart city platforms used in domestic and foreign countries and analyze the technology applied to smart city to study smart city platforms that solve various problems of the city such as environment, energy, safety, traffic, environment.

• 실천공학교육논문지
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• 제15권2호
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• pp.357-364
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• 2023

인공지능 기술의 급속한 발전으로 인해 생성형 인공지능 플랫폼은 다양한 분야에서 혁신적인 활용이 이루어지고 있다. 본 논문에서는 인공지능을 교육에 활용한 연구사례, 생성형 인공지능 플랫폼이 컴퓨터그래픽 영역에 활용된 사례를 살펴보고, 생성형 인공지능 교육 방향성에 대해 논의하였다. 컴퓨터그래픽에서 이미지 생성과 편집, 영상편집에 활용 가능한 생성형 인공지능 플랫폼을 소개하고, 영상편집 제작과정에 적용할 수 있도록 활용방법을 제안하였다. 이러한 생성형 인공지능 플랫폼은 제작공정에서 창작자의 수고를 덜고, 시간을 단축시킨다는 효율성 측면에서도 장점뿐만 아니라 개인의 역량을 증진할 수 있다. 컴퓨터그래픽 제작에 있어 생성형 인공지능 플랫폼은 다양한 변화를 가져다 주었다. 그런 변화를 살펴보고 생성형 인공지능 플랫폼을 활용한 창작 교육에 방향성을 제시하고자 한다.

• 중소기업연구
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• 제43권2호
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• pp.59-86
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• 2021

플랫폼(platform) 개념은 제품 플랫폼, 거래 플랫폼에서 산업 플랫폼에 이르기까지 다양한 형태로 기업의 경영활동에 활용되어 왔다. 모든 플랫폼은 공통적으로 자주 재사용 되는 핵심과 재사용이 적고 자주 변경되는 주변부로 구성된다. 기업은 플랫폼을 사용하여 제품군, 거래, 그리고 혁신을 보다 효율적으로 개발 및 창출할 수 있다. 이러한 플랫폼은 제품을 중심으로 한 전통적 산업구조에 변화를 가져옴으로써 많은 중소기업에게 새로운 기회를 제공한다. 한국의 서비스용 로봇 산업은 협소한 시장 규모로 인해 주로 기술 중심의 중소기업으로 구성되어 있다. 이들 중소기업들은 기술개발에 성공하더라도 제품을 판매하기 위해 시장을 창출하고 확장하는데 어려움을 겪는다. 따라서 본 연구는 한국 서비스용 로봇 산업의 특성 및 문제점을 조명하고 중소기업인 로보프린트가 어떻게 서비스용 로봇 시장을 확장하고 지속적으로 성장하였는지를 플랫폼 이론을 적용하여 분석하였다. 분석결과, 로보프린트는 제품과 거래 플랫폼 개념을 적용한 것으로 나타났다. 첫째, 로보프린트는 초기에 개발한 아트봇의 핵심 기술을 기반으로 페인팅 로봇, 건물 외벽 청소 로봇 및 맞춤형 로봇을 개발하였다. 또한, 직접 로봇을 이용한 아파트 벽화 서비스를 제공하고 이를 방음벽, 지하통로, 옹벽 등 다양한 지역으로 확장하였다. 뿐만 아니라 가상현실 기술을 개발하는 등 새로운 서비스를 지속적으로 추가했다. 둘째, 로보프린트는 벽화 서비스 구매자와 벽화 디자이너를 매개하였다. 이는 벽화 서비스를 의뢰하는 구매자들이 디자이너를 탐색해야 하는 번거로움을 줄여주었고, 벽화 디자이너들에게는 벽화사업의 참여 기회를 열어주었다. 마지막으로 로보프린트는 플랫폼의 범위를 지속적으로 넓히고자 노력하였다. 내부에서만 재사용되던 로보프린트의 기술을 외부 기업과 공유하기 위해 대구광역시 '신기술 플랫폼 서비스'에 참여하였다. 뿐만 아니라 로봇을 외부 기업에 임대하여 서비스 플랫폼을 공유하고자 노력하고 있다. 본 연구는 중소기업이 다양한 플랫폼을 이용하여 시장을 창출하고 지속적으로 확장할 수 있음을 보여주어 기존 플랫폼 이론에 기여하며 실무자들에게도 유용한 시사점을 준다.

• 센서학회지
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• 제20권5호
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• pp.317-321
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• 2011

A Micro platform for micro gas sensor consisted of micro heater, insulator, and sensing electrode on 2 ${\mu}m$ thick $SiN_x$ membrane. Three types of micro platforms were designed and fabricated with membrane sizes. Total size of micro platform was 2.6 mm by 2.6 mm. Measured power consumptions were 28 mW, 28 mW, and 32.5 mW for Type 1, Type 2, and Type 3. At this moment, temperatures of membranes on the platforms were $295^{\circ}C$, $297^{\circ}C$, and $296^{\circ}C$, respectively. Fabricated micro platform considered appropriate to apply for low power consumption micro gas sensor. Micro gas sensors were prepared by the sequence that $SnO_2$ nanopowder pastes were dropped on membrane of Type 1 platforms, dried in oven, heat-treated with micro heaters in platforms. One of the micro gas sensors was tested for gas response to 1157 ppm, 578 ppm, and 231 ppm of methane and 1.68 ppm, 0.84 ppm, and 0.42 ppm of $NO_2$.

• Genomics & Informatics
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• 제21권2호
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• pp.24.1-24.7
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• 2023

Assays of clinical diagnosis and species identification using molecular markers are performed according to a quantitative method in consideration of sensitivity, cost, speed, convenience, and specificity. However, typical polymerase chain reaction (PCR) assay is difficult to quantify and have various limitations. In addition, to perform quantitative analysis with the quantitative real-time PCR (qRT-PCR) equipment, a standard curve or normalization using reference genes is essential. Within the last a decade, previous studies have reported that the digital PCR (dPCR) assay, a third-generation PCR, can be applied in various fields by overcoming the shortcomings of typical PCR and qRT-PCR assays. We selected Stilla Naica System (Stilla Technologies), Droplet Digital PCR Technology (Bio-Rad), and Lab on an Array Digital Real-Time PCR analyzer system (OPTOLANE) for comparative analysis among the various droplet digital PCR platforms currently in use commercially. Our previous study discovered a molecular marker that can distinguish Hanwoo species (Korean native cattle) using Hanwoo-specific genomic structural variation. Here, we report the pros and cons of the operation of each dPCR platform from various perspectives using this species identification marker. In conclusion, we hope that this study will help researchers to select suitable dPCR platforms according to their purpose and resources.