• Journal of the Korea Society of Computer and Information
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• v.11 no.5 s.43
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• pp.39-52
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• 2006

As accelerates the technical evolution of high-speed network and progresses the digitalization of broadcasting network, TV channel service through satellite/cable/terrestrial networks becomes more stable and mature. However, TV channel service using IP network such as IPTV is recently emerging. Especially, when it comes to current mosaic EPG(Electronic Program Guide) as a channel guide, the implementation of EPG via IP network is under developing. Furthermore, the personal target mosaic EPG is not provided at all in the IPTV. This paper proposes a construction method of mosaic system which can support fixed and personalized mosaic EPG using IP network for viewers. The fixed mosaic EPG is made several steps as follows ; First, H/E generates several mosaic A/V streams. Then, which are transmitted to the STB in terms of multicasting via IP network. Finally, mosaic EPG is displayed on TV through STB. In addition, this paper describes a construction model of the personalized A/V mosaic EPG that represents each person's favorite channels according to their tastes and interests. As for the contributions. The TV channel guide using IP network enable viewer to select channel more easily with practical adaptation of multi-channel expansibility and sufficient usability. In addition, through personal mosaic EPG, a number of viewers can compose their own mosaic EPG and enjoy a variety of channel easily in accordance with their preferences. Finally, the personal mosaic EPG can prohibit non-adult users from connecting adult-only contents more efficiently.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.466-466
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• 2016

최근 들어 보의 환경적인 측면을 고려한 저낙차형 구조물 설치가 요구되면서 고정보의 형태도 다양하게 제안되고 있다. 그러나 실무에 적용하기 위한 고정보의 설계 가이드라인은 매우 한정적이며 대부분 보 하류부에 대한 세굴이나 세굴 방지에 대한 연구가 주를 이루고 있다. 따라서 본 연구는 국내 중소하천에 설치된 고정보의 물리적 제원 변경에 의한 수리적 특성을 분석함으로써 환경적인 측면을 고려한 저낙차형 고정보 설계 시 반영할 수 있는 기초자료를 제공하는데 목적이 있다. 이를 위해 경사형 및 계단형 보에 대해 crest 변화에 따른 기본적인 유량계수를 도출하였으며 수위-유량 관계 곡선을 개발하였다. 또한 유량과 crest 등과 같은 수리학적 조건을 변화시켜 자유 흐름 조건 및 잠긴 흐름 조건의 흐름특성을 분석하였다. 실험은 crest 길이에 따라 총 4개의 case로 나누어 수행하였다. 각 case 별 총 8개 유량조건에 대해 각각 자유흐름과 잠긴 흐름에서의 수위를 측정하였으며 정확한 흐름 및 수위 계측을 위해 디지털 카메라와 캠코더를 활용하였다. 분석결과 같은 유량조건에서는 crest가 증가할수록 수위 값도 증가하였으며 유량별 수위의 범위는 경사형 보가 계단형 보 보다 넓은 것으로 나타났다. 향후 본 연구 결과는 현장에서 고정보에 대한 crest 설계 시 충분히 고려될 수 있는 자료가 될 것으로 판단된다.

• Journal of Dental Rehabilitation and Applied Science
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• v.37 no.3
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• pp.147-156
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• 2021

There are various treatment options such as conventional complete denture, hybrid prosthesis and implant-supported fixed prosthesis for fully edentulous patients. In case of implant-supported fixed prosthesis, compared to removable prosthesis, it is difficult to place the implant in the correct position considering the anatomical contours of the final prosthesis. In this case, a full mouth rehabilitation with implant-supported fixed prosthesis was performed for a patient who required extraction of all remaining teeth due to dental caries and chronic periodontitis. In the implant placement stage, the implant was placed in the desired position using a surgical guide fabricated considering the anatomical contours of the final prosthesis, and the function and esthetics were evaluated through correction and re-fabrication of the fixed provisional restoration. A final restoration of porcelain fused to gold prosthesis was delivered to the patient based on the provisional restoration. To cope with complications such as loosening of screws and fracture of porcelain, a screw-retained type prosthesis was fabricated for the posterior part and a screw-cement-retained type prosthesis for the anterior part. As a result, the patient showed an improved prognosis in terms of functional and esthetics after the final prosthesis was delivered.

• Journal of Korea Water Resources Association
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• v.49 no.12
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• pp.961-969
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• 2016

Due to the recent requirement of installing low-head structures considering environmental aspects, various types of fixed weir have been suggested. However, the design guideline of transverse structures for practical application is very limited. The purpose of the present study is to analyze the hydraulic properties of the fixed weirs installed at the small and middle sized rivers of Korea depending on the physical specifications to provide fundamental data that may be reflected to the design of a low-head fixed weir considering the relevant environmental aspects. The basic discharge coefficient of slope-type and step-type weirs depending on change of crest was estimated, and a stage-discharge curve was developed. In addition, the flow properties under free flow and submerged flow conditions were analyzed by varying the hydraulic conditions such as discharge and crest.

• The Journal of Korean Academy of Prosthodontics
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• v.59 no.1
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• pp.79-87
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• 2021

The digital workflow of optical impressions by the intraoral scanner and CADCAM manufacture of dental prostheses is actively developing. The complex process of traditional impression taking, definite cast fabrication, wax pattern making, and casting has been shortened, and the number of patient's visits can also be reduced. Advances in intraoral scanner technology have increased the precision and accuracy of optical impression, and its indication is progressively widened toward the long span fixed dental prosthesis. This case report describes the long span implant case, and the operator fully utilized digital workflow such as computer-guided implant surgical template and CAD-CAM produced restoration after the digital impression. The provisional restoration and customized abutments were prepared with the optical impression taken on the same day of implant surgery. Moreover, the final prosthesis was fabricated with the digital scan while utilizing the same customized abutment from the provisional restoration. During the data acquisition step, stl data of customized abutments, previously scanned at the time of provisional restoration delivery, were imported and automatically aligned with digital impression data using an 'A.I. abutment matching algorithm' the intraoral scanner software. By using this algorithm, it was possible to obtain the subgingival margin without the gingival retraction or abutment removal. Using the digital intraoral scanner's advanced functions, the operator could shorten the total treatment time. So that both the patient and the clinician could experience convenient and effective treatment, and it was possible to manufacture a prosthesis with predictability.

• Journal of Dental Rehabilitation and Applied Science
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• v.30 no.2
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• pp.170-175
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• 2014

The growth disorder influences craniofacial development and early loss of permanent teeth. This case reports the importance of computerized tomography (CT) and surgical guide to identify horizontal bone loss, adjacent teeth and to guide drills when placing implants in a short stature patient. The patient has idiopathic short stature and the 3rd grade of intellectual disability. To recover posterior mandibular teeth, implant treatment was planned. CT images showed that the adjacent teeth were located markedly to the buccal side. A CT-based surgical guide was fabricated and implants was placed using flapless surgery. Bone dehiscence and fenestration may happen when the surgical guide was fabricated just based on adjacent clinical crowns. Thus, it is essential to analysis bone and teeth and to make surgical guide through CT, especially in atrophied bone on grow disorder patients. Furthermore, systematic researches are recommended to elucidate the relationship between growth disorder and tooth malposition.

• The Journal of Korean Academy of Prosthodontics
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• v.61 no.1
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• pp.73-81
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• 2023

There are various approaches to treatment for patients with fully edentulous jaw. In maxilla, it is easy to obtain sufficient stability, support, and retention with the traditional full denture method. In mandible, however, there are difficulties caused by anatomical limitations. In this case, treatment with implants can be considered. If it is difficult to place implants in posterior area, a fixed complete denture can be considered, using 4 - 5 implants anterior to mental foramen. This approach has changed in many ways, such as surgical methods and materials used, over the years. This case report compares two approaches and their changes over time, especially in the cases of mandibular fixed prostheses using implants, paired with maxillary complete denture.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.58-60
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• 2012

스마트 TV 및 스마트 셋톱박스와 같은 가정내의 고정형 스마트 기기에 대한 관심이 증가하고 있으며, 이러한 기기는 가정의 미디어 서비스를 제어하는 콘텐츠 허브로 발전하고 있으며, 홈 플랫폼의 포괄적 개념으로 정의할 수 있다. 이러한 홈 플랫폼은 IPTV, 지상파, 케이블, 및 위성 등의 다양한 방송 콘텐츠를 수용할 수 있으며, 모바일 단말 등의 외부 기기와의 연동을 통해 다양한 형태의 콘텐츠에 대해서 접근이 가능하다. 이와 관련하여 실제 서비스 제공이 가능한 기술은 방송 콘텐츠와 시간적으로 연계된 부가정보를 사용자의 모바일 단말에서 제공해 주는 서비스 기술이다. 또, 가정내의 홈 플랫폼을 통해 접근 가능한 다양한 방송 및 콘텐츠 부가정보를 통합적으로 취합하여 하나의 콘텐츠 가이드를 생성하고, 이를 개인 모바일 단말로 전송하여 사용자의 콘텐츠 소비 만족도를 보다 향상할 수 있는 기술에 대한 관심 역시 증가하고 있다. 본 논문에서는 홈 플랫폼에서 방송 수신 정보, 로컬 콘텐츠 및 모바일 단말의 저장 콘텐츠 정보를 기반으로 부가정보를 정합하여 ECG를 생성하고, 이를 모바일 단말에 전송하여 콘텐츠 서비스를 제공하는 플랫폼을 설계하고, 구현하였다. 통합 ECG 생성을 위한 콘텐츠의 메타데이터는 TV-Anytime 표준을 기반으로 적용되어 플랫폼간 상호 연동성이 확보되도록 하였다.

• The Journal of Korean Academy of Prosthodontics
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• v.56 no.1
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• pp.8-16
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• 2018

Purpose: The purpose of this study is to evaluate the accuracy of surgical stent according to the supported type. Materials and methods: 5 sets of dental models which have tooth supported edentulous area and tooth-tissue supported edentulous area were made. Dental model were scanned with model scanner, and CBCT was taken. CT data and model scan data were overlapped using In2Guide software, implant were virtually planned in the software. Surgical stents are fabricated by 3D printing. The implant fixture were installed using the surgical stent, CBCT were retaken. CBCT before surgery and after surgery were overlapped, and the differences (angle difference, coronal difference, apical difference) were evaluated using statistical analysis. Results: In the assessment of the accuracy of surgical guides according to arch type, there are no statistically significant differences between maxilla and mandible. In the case of support type, tooth supported stents showed lower angle difference and length difference than tooth-tissue supported stents, which are statistically significant. Conclusion: Arch type does not affect the accuracy of surgical stents. But tooth support stents are more accurate than tooth-tissue support stents in the case of angle and length difference.

• 한국정보교육학회:학술대회논문집
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• 2009.08a
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• pp.269-274
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• 2009

차세대 기술과 접목된 교육용콘텐츠의 다양한 연구가 진행되고 있다. 현재 디지털교과서가 연구학교를 중심으로 실험 및 적용 단계에 있으나 학습내용이 고정적이고 제한된 콘텐츠만을 제공하기 때문에 학생들의 흥미와 몰입감 및 학습효과에서 부족한 부분이 많다. 이를 해결하기 위해서는 증감형 콘텐츠를 설계하여 학생들의 흥미와 몰입감 및 상호작용을 높여야 한다고 본다. 이에 본 논문에서는 증강현실 기술을 기반으로 하여 태블릿 기반의 디지털교과서 콘텐츠로 학습을 할 때 관찰하기 어려운 가상의 정보 제공 및 부가적인 정보를 활용하며 상황 인지를 통해 사용자의 상황에 적합한 가이드라인이나 부가 정보를 제공받을 수 있는 차세대 교육용 콘텐츠를 설계해 보고자 한다. 본 연구의 결과는 향후 디지털교과서 적용 시 효과적인 개발방안이 될 것이다.