• Journal of Periodontal and Implant Science
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• v.41 no.5
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• pp.211-217
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• 2011

Purpose: The marginal bone levels around implants following restoration are used as a reference for evaluating implant success and survival. Two design concepts that can reduce crestal bone resorption are the microthread and platform-switching concepts. The aims of this study were to analyze the placement of microthreaded and platform-switched implants and their short-term survival rate, as well as the level of bone around the implants. Methods: The subjects of this study were 27 patients (79 implants) undergoing treatment with microthreaded and platform-switched implants between October 2008 and July 2009 in the Dental Hospital of Yonsei University Department of Periodon-tology. The patients received follow-up care more than 6 months after the final setting of the prosthesis, at which time periapical radiographs were taken. The marginal bone level was measured from the reference point to the lowest observed point of contact between the marginal bone and the fixture. Comparisons were made between radiographs taken at the time of fixture installation and those taken at the follow-up visit. Results: During the study period (average of 11.8 months after fixture installation and 7.4 months after the prosthesis delivery), the short-term survival rate of microthreaded and platform-switched implants was 100% and the marginal bone loss around implants was $0.16{\pm}0.08$ mm, the latter of which is lower than the previously reported values. Conclusions: This short-term clinical study has demonstrated the successful survival rates of a microthread and platform-switched implant system, and that this system is associated with reduced marginal bone loss.

• Journal of Platform Technology
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• v.6 no.2
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• pp.3-9
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• 2018

Recently VR environment is used in many areas including mobile learning, smart factory. However HMD(head-mounted display) is required to a dedicated and expensive system with high-end specification. When designing a VR system, it is needed to handle performance, mobility and usability. Many VR applications need to handle diverse sensors and user inputs continuously in a streaming manner. In this paper we design a VR mobile platform and implement a low-cost mobile VR HMD running on the platform. The VR HMD supports 3D contents delivery in a mobile manner. It is used to detect the motion detection based on angle value of a VR player from accelerator and gyro sensor. The MPU-6050, 6-axis sensor, is used to get a sensory value and the sensory value is taken as an input to a VR rendering server on a Unity game engine that is generated 3D images.

• Journal of Information Technology Services
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• v.20 no.2
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• pp.127-146
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• 2021

Donation-based crowdfunding(DBC) is conducted from voluntary participation by project operators. It requires a different operational strategy than general crowdfunding. However, there is a limited amount of research on the operational strategy of DBC. This study explores the value co-creation(VCC) strategy of DBC and analyzes the operation of DonorsChoose.org. The research questions encompass the following: First, we identify the VCC activities of DBC. Second, we uncover activities of the platform operators that facilitate the participation of project operators in VCC activities. Third, we explore how VCC activities affect project operational performance and platform performance in DBC. By adopting a single case study method on DonorsChoose.org, this study provides meaningful insight and detailed understanding into the VCC in DBC. First, VCC processes of DBC are identified(Co-ideation, Co-design, Co-funding, Co-operation, and Co-evaluation). Also, interactions between platform operators and project operators were defined at each stage. Second, this study confirmed that standardization and simplification of platform operators, support for pre- and post-activity, and high-quality information delivery activities were critical. Third, we confirm that these VCC activities improve VCC operational performance and platform performance. The theoretical significance of this study is that the concept of VCC, previously concentrated on participants with economic drivers(consumers and investors), has been applied to the context of DBC, a form of participation by participants with non-economic drivers(supporters and donors). In addition, this study practically contributes to the practice of VCC strategy among various platform operating strategies in DBC.

• Electronics and Telecommunications Trends
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• v.35 no.1
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• pp.80-88
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• 2020

This paper describes the development trends and service provision examples of disaster occurrence and spread prediction technology for various disasters such as tsunamis, floods, and fires. In terms of fires, we introduce the WIFIRE system, which predicts the spread of large forest fires in the United States, and the Metro21: Smart Cities Institute project, which predicts the risk of building fires. This paper describes the development trends in tsunami prediction technology in the United States and Japan using artificial intelligence (AI) to predict the occurrence and size of tsunamis that cause great damage to coastal cities in Japan, Indonesia, and the United States. In addition, it introduces the NOAA big data platform built for natural disaster prediction, considering that the use of big data is very important for AI-based disaster prediction. In addition, Google's flood forecasting system, domestic and overseas earthquake early warning system development, and service delivery cases will be introduced.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.189-192
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• 2005

홈 네트워크 서비스의 활성화와 더불어 홈 네트워크 제어를 포함하는 다양한 서비스가 홈 게이트웨이를 중심으로 제공되고 있는데, 이러한 다양한 서비스의 지속적인 제공과 업그레이드 등을 위해서는 개방성 및 확장성을 갖춘 서비스 분배관리 플랫폼 (Service Delivery & Management Platform)이 필수 요소가 된다. 서비스 분배관리 플랫폼은 홈 게이트웨이를 관리하는 기능 뿐아니라. 홈 게이트웨이상에 다운로드된 서비스의 라이프 사이클을 관리하는 방법을 제공한다. 서비스 제공자는 개발한 서비스 응용을 서비스 플랫폼에 등록하고, 서비스 분배라는 행위를 거쳐 홈게이트웨이의 프레임워크상에 다운로드되며, 해당 서비스 응용은 설치와 동시에 구동되면서 서비스 사용자에게 서비스를 제공하게 된다. 본 고에서는 홈네트워크 서비스 분배관리를 제공하는데 있어서, 서비스 사용자의 요구에 의한 pull 방식의 서비스 제공 방법과 시스템 관리자에 의한 push 방식의 서비스 제공 방법을 지원하는 서비스 분배관리 시스템의 구조 및 시나리오에 대해 제시하고자 한다.

• Ceramist
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• v.22 no.3
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• pp.269-280
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• 2019

Ceramic layered double hydroxide (LDH) nanohybrids have attracted considerable interest in biomedical science due to their unique structural feature and characteristics in biological condition. Many studies on LDH nanoparticles have been reported in diagnosis applications including magnetic resonance imaging (MRI) contrast agents in order to not only provide better imaging performance through multimodal imaging strategy, but realize therapeutic function which treat cancers in one platform. This review highlights the recent progress in MRI T₁ contrast agent, dual modal imaging system, and MRI-guided drug delivery systems ranging from synthetic method and characterization to evaluation in vitro and in vivo based on the ceramic LDH nanohybrids. Future research directions are also suggested for next-generation bio-imaging contrast agent.

• ETRI Journal
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• v.35 no.4
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• pp.666-676
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• 2013

With the recent growth in smartphone services, the "mobile" environment has become a key factor to consider in the design of the future Internet. In this paper, we propose Mobile-Oriented Future Internet (MOFI), which is a new architecture for the future Internet for mobile-oriented environments. The MOFI architecture is designed with three functional features: global identifier and local locator in the identifier-locator separation, query-first data delivery for route optimization, and distributed control of identifier-locator mapping. The proposed architecture and functional operations are implemented and tested using the Linux platform. From the experiment results, we see that the MOFI architecture performs better than the existing identifier-locator separation schemes, such as Proxy Mobile IP and Host Identity Protocol, in terms of data throughout, mapping control overhead, and handover delay.

• Journal of Adhesion and Interface
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• v.23 no.3
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• pp.70-74
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• 2022

Tannic acid, one of plant-derived polyphenols, has been studied as a molecular adhesive, surface modification, energy storage and generating device, and biomedical application as it can interact with biopolymers. In this study, we synthesized porous silica nanoparticles that are widely used in biomedical engineering fields such as drug delivery and bioimaging, and then analyzed tannic acid mediated surface modification of mesoporous silica nanoparticles.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.01a
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• pp.81-83
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• 2021

현재 국내 많은 도서관과 여러 대여점 시설이 코로나로 인하여 운영에 제한이 있거나 중지되었다. 이에 기존 시설 이용자는 도서 대여에 불편함을 겪고 있으며, 민간 도서 대여점과 도서 대여업 산업 전반의 매출이 감소한 것을 확인하였다. 본 논문에서는 시설 사용자의 불편함과 민간 업체의 매출을 개선하기 위해 대여 서적 배달 서비스인 O2O(Offline to online) 플랫폼을 클라우드 서버에 구축하고자 한다. 플랫폼은 하이브리드 애플리케이션으로 구현하여 스마트 폰에 익숙한 신세대와 컴퓨터의 친숙한 기성세대 모두 쉽게 이용할 수 있게 구현하였으며, 이를 통해 대여점 이용자는 편리하고 안전하게 집에서 대여하고 대여점은 이용자 증가와 더불어 또 다른 홍보 수단으로 이용하여 대여점의 매출 개선을 기대할 수 있다.

• BMB Reports
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• v.49 no.11
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• pp.585-586
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• 2016

Extracellular vesicles (EVs) are natural carriers of biomolecules that play central roles in cell-to-cell communications. Based on this, there have been various attempts to use EVs as therapeutic drug carriers. From chemical reagents to nucleic acids, various macromolecules were successfully loaded into EVs; however, loading of proteins with high molecular weight has been huddled with several problems. Purification of recombinant proteins is expensive and time consuming, and easily results in modification of proteins due to physical or chemical forces. Also, the loading efficiency of conventional methods is too low for most proteins. We have recently proposed a new method, the so-called exosomes for protein loading via optically reversible protein-protein interaction (EXPLORs), to overcome the limitations. Since EXPLORs are produced by actively loading of intracellular proteins into EVs using blue light without protein purification steps, we demonstrated that the EXPLOR technique significantly improves the loading and delivery efficiency of therapeutic proteins. In further in vitro and in vivo experiments, we demonstrate the potential of EXPLOR technology as a novel platform for biopharmaceuticals, by successful delivery of several functional proteins such as Cre recombinase, into the target cells.