• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2008년도 International Symposium on Remote Sensing
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• pp.365-367
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• 2008

A digital city model represents a 3D environment of a city with various city object information such as 3D building model, road, and land cover. Usually, at least two satellite images with some image overlap are necessary and a complex satellite-related computation needs to be carried out to create a city model. This is an expensive technique, because it requires many resources and excessive computational cost. The authors propose a methodology to create a digital city model including 3D building model and land cover information from a single high resolution satellite image. The approach consists of image pan-sharpening, shadow recovery, building occlusion restoration, building model extraction, and land cover classification. We create a digital city model using a single KOMPSAT-2 image and review the result.

• 대한치과보철학회지
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• 제61권4호
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• pp.328-343
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• 2023

최근 삼차원적 안면 스캔 (facial scan) 및 악운동 (jaw motion) 등의 데이터를 통합하여 동적 교합을 나타내는 가상 환자를 형성함으로써 심미적인 전치부 고정성 보철물을 제작하는 방법이 소개되고 있다. 이를 통해 진단과정에서 환자와의 원활한 소통이 가능하며, 심미적인 보철 치료의 예지성을 높일 수 있고, 교합조정의 가능성을 낮출 수 있다. 본 증례에서는 상악 전치부 심미 보철 수복이 필요한 환자에서 구강 스캔 데이터와 삼차원 (3D) 안면 스캔데이터, 환자의 악운동 기록을 computer-aided design (CAD) 소프트웨어 상에서 통합하여 동적 교합을 나타내는 가상 환자를 형성하였다. 이를 통해 치료의 결과를 시뮬레이션하고 심미적인 상악 전치부 고정성 보철물을 제작 및 수복하였다. 또한, 안정적인 교합관계를 회복하고 적절한 전방유도가 형성되었는지 확인하기 위하여 각각 치료 단계별로 환자의 교합을 비교 평가하였으며 심미적, 기능적으로 만족스러운 결과를 보였기에 이를 보고하는 바이다.

• 구강회복응용과학지
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• 제19권1호
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• pp.35-41
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• 2003

With the understanding of tooth crown biomechanics and the progress of dentin adhesives, bonded porcelain restorations including a porcelain laminate veneer present an extended spectrum of indications for anterior teeth. Porcelain laminate veneer as a restoration offers the conservative solution that balances the functional and esthetic needs of the anterior dentition. Porcelain's stiffness, its surface characteristics, and the biomechanical strength achieved through bonding to tooth surface enable the restoration of the tooth as a whole supporting occlusal force and masticatory function. Namely, the optical effects inherent in the tooth and the lifelike features of the porcelain make that this restoration approaches the ultimate in esthetic satisfaction for both the dentist and the patient. A 49-year-old female patient with the incisal discoloration of upper central incisors and black triangle between the central incisors was referred to correct her esthetic problems with prosthodontic approach. The patient was satisfied with two porcelain laminate veneers that were made according to prof. Magne and Belser's recommendation.

• 대한치과의사협회지
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• 제56권9호
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• pp.503-511
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• 2018

Outcome of esthetic ceramic restorations are affected by tooth size, gingival contour, occlusal relationship, etc. For this reason, demand of orthodontic treatment before esthetic ceramic restoration is increasing. If a Bolton ratio discrepancy, a problem of the maxillary incisor's vertical position, a problem of inclination of anterior teeth, a pathogenic occlusion is existed, a pre-prosthodontic orthodontics should be accomplished. These problems can be satisfactory only after the prosthetic treatment is performed after orthodontic treatment. When orthodontic treatment is given, it should be treated with the following principle. 1. Treat it in the direction of functioning occlusion. 2. Keep the patient's stable occlusal scheme. 3. Treat the teeth by considering the average tooth size and Bolton ratio. Ortho-Prostho combined treatment with optimal treatment plan can lead a patient's function, esthetics, and long-term stability.

• 대한치과보철학회지
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• 제59권1호
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• pp.107-115
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• 2021

전체 치열에 걸쳐 과도한 병적 마모가 발생하는 경우 저작기능의 저하 및 악관절, 근신경계의 병리적인 문제가 발생할 수 있다. 본 증례는 71세 남성 환자로 상악 좌측 제 1 대구치 부위 임플란트 수복 공간의 부족 및 전치부 절단교합 및 전방, 측방유도의 상실 및 전치아에 걸친 심화된 파절과 마모가 관찰된 환자에서 수직고경 증가를 동반한 전악구강회복술을 계획하였다. 환자의 적절한 수직고경을 결정하기 위하여 안모, 심미, 기능 및 보철 수복 공간을 평가하였으며, 거상된 수직고경의 임시수복물을 제작하였고 약 4개월 간의 관찰기간을 거친 후 임상증상 및 불편감 없음을 확인한 후 CAD-CAM을 이용한 단일구조 지르코니아 전장관전악수복을 완료하였다. 이상과 같은 과정을 통해 수직고경 거상을 동반한 전악구강회복술을 시행하였으며, 만족스러운 심미 및 기능적 결과를 얻었기에 이를 보고하고자 한다.

• 대한치과보철학회지
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• 제39권3호
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• pp.313-318
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• 2001

Masticatory function is more important than esthetics in posterior fixed restoration. The usual technique-mounting the casts on a semi-adjustable articulator, etc. -cannot make all patients satisfied with their restorations. For example, functionally generated path technique can be an easier and more satisfactory method in the restoration of group function. These clinical reports describe various approaches for occlusal restoration of relatively simple posterior fixed protheses according to patients occlusal patterns. The 3-unit bridge restoration is one of the most popular treatment options in prosthodontics. Because dentists have much experiences of it, they restore a missing span of one tooth mechanically, that is, without special consideration. While esthetics is important in making an anterior 3-unit fixed prostheses, mastication is more focused on in posterior 3-unit bridge restoration. Many dentists are concerned about various aspects in esthetics, such as morphology of the tooth, value, chroma, hue, translucency, surface texture, etc. But they do not usually consider various methods to restore occlusion. They treat one-tooth-missing area in a similar way in spite of patients having variety of occlusal patterns. Three cases are presented here in 3 or 4-unit bridge restoration. They show some methods to restore patients' occlusal patterns.

• 대한원격탐사학회지
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• 제38권1호
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• pp.33-43
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• 2022

This study presents a method to restore an optical satellite image with distortion and occlusion due to fog, haze, and clouds to one that minimizes degradation factors by referring to the same type of peripheral image. Specifically, the time and cost of re-photographing were reduced by partially occluding a region. To maintain the original image's pixel value as much as possible and to maintain restored and unrestored area continuity, a simulation restoration technique modified with the Cycle Generative Adversarial Network (CycleGAN) method was developed. The accuracy of the simulated image was analyzed by comparing CycleGAN and histogram matching, as well as the pixel value distribution, with the original image. The results show that for Site 1 (out of three sites), the root mean square error and R² of CycleGAN were 169.36 and 0.9917, respectively, showing lower errors than those for histogram matching (170.43 and 0.9896, respectively). Further, comparison of the mean and standard deviation values of images simulated by CycleGAN and histogram matching with the ground truth pixel values confirmed the CycleGAN methodology as being closer to the ground truth value. Even for the histogram distribution of the simulated images, CycleGAN was closer to the ground truth than histogram matching.

• 대한심미치과학회지
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• 제7권1호
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• pp.28-31
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• 1998

It is difficult to make an artificial central incisor similar to natural tooth. All ceramic porcelain of this patient is not esthetic, and there is gingival recession due to ill-fitted margin. She has class II division 1 occlusion, so upper central incisors is labioversed. Upper light central incisor is well-characterized but the yellowish brown color of dentin is appeared on the incisal third portion of the central incisor. At 1st trial, the shape and characterization of restoration is good but shade is little dark. At 2nd trial, the shape is better but patient complained on black triangle of mid interdental space, so mesiocervical portion of restoration is overcontoured to compromise the black triangle. Completed metal ceramic crown is in harmony with the adjacent central incisor in aspect of shape, shade, and characterization.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2008년도 International Symposium on Remote Sensing
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• pp.371-374
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• 2008

In very high-spatial resolution remote sensing imagery, it is difficult to extract the feature information of various objects because of occlusion and shadows. Moreover, various and feeble information within shadows can be of use in GIS-based applications and remote sensing analysis. In this paper, we developed a radiometric restoration method for shadow areas using KOMPSAT-2 satellite image. After detecting the shadow, non-shadow pixels nearby are extracted using a morphological filter. An iterative linear regression method is applied to calculate the relationship between shadow and non-shadow pixels. The shadows are restored by the parameters of the linear regression algorithm. Tests show that recovery of shadowed areas by our method leads to improved image quality.

• 대한치과의사협회지
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• 제51권11호
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• pp.604-609
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• 2013

Crown fractures are relatively common trauma to anterior teeth, and should be restored immediately in most cases. For those who suffer from unfortunate traumatic episode, the best treatment option should be minimally invasive approach. In the presence of fractured tooth fragment, reattachment procedure creates positive emotional response in the patient and simplifies the procedure and maintenance of the patient's original tooth anatomy and occlusion. Without fractured tooth fragment, next conservative option could be direct composite restoration which is based on minimal invasion concept. This article proposes simple and very conservative techniques that anyone can do in daily practice.