• Imaging Science in Dentistry
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• v.45 no.2
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• pp.109-115
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• 2015

Central odontogenic fibroma (COF) is a rare benign tumor that accounts for 0.1% of all odontogenic tumors. A case of COF (simple type) of the mandible in a four-year-old boy is described in this report. The patient showed asymptomatic swelling in the right inferior border of the lower jaw for one week. A panoramic radiograph showed a poorly-defined destructive unilocular radiolucent area. Cone-beam computed tomography showed expansion and perforation of the adjacent cortical bone plates. A periosteal reaction with the Codman triangle pattern was clearly visible in the buccal cortex. Since the tumor had destroyed a considerable amount of bone, surgical resection was performed. No recurrence was noted.

• Journal of Information Processing Systems
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• v.13 no.2
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• pp.256-267
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• 2017

An active research area in computer vision, stereo matching is aimed at obtaining three-dimensional (3D) information from a stereo image pair captured by a stereo camera. To extract accurate 3D information, a number of studies have examined stereo matching algorithms that employ adaptive support weight. Among them, the adaptive census transform (ACT) algorithm has yielded a relatively strong matching capability. The drawbacks of the ACT, however, are that it produces low matching accuracy at the border of an object and is vulnerable to noise. To mitigate these drawbacks, this paper proposes and analyzes the features of an improved stereo matching algorithm that not only enhances matching accuracy but also is also robust to noise. The proposed algorithm, based on the ACT, adopts the truncated absolute difference and the multiple sparse windows method. The experimental results show that compared to the ACT, the proposed algorithm reduces the average error rate of depth maps on Middlebury dataset images by as much as 2% and that is has a strong robustness to noise.

• The Journal of Korean Academy of Prosthodontics
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• v.9 no.1
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• pp.79-83
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• 1969

1) 가능(可能)한한 조직(組織)이 변형(變形)되지 않아야 한다. 2) Atmospheric pressure를 이용(利用)하기 위(爲)하여 peripheral border 에 있어서의 조직변형(組織變形)이 필요(必要)한 경과(境過)는 그 정도(程度)가 eiastic force가 retentive force 보다 크지 않도록 최소한(最小限)으로 해야 한다. 3) Denture base와 조직(組織)의 원형간(原形間)에는 접촉(接觸)이 밀접(密接)해야 한다. 그래야 saliva의 film 균일(均一)하고 얇게 될 수 있다. 4) Atmospheric pressure는 denture의 retention과 중요(重要)한 연관성이 있으므로 physiologic seal area를 형성(形成)해 주는 것이 유리(有利)하다. 5) Ridge의 형태(形態)도 denture의 retention 대(對)한 하나의 중요(重要)한 인자(因子)이다. 6) Denture에 의(依)해서 피개(被蓋)되는 면적(面積)은 retention에 관계(關係)되는 한 인자(因子)로써 피개면적(被蓋面積)이 클수록 유지력(維持力)이 커진다. 7) Saliva의 viscosity도 retention의 한 인자(因子)가 된다. 8) Friction은 retention의 한 인자(因子)가 될수는 있으나 병인적(病因的)인 증상(症狀)을 유발(誘發)할수 있으므로 이용(利用)해서는 않된다.

• Journal of Oral Medicine and Pain
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• v.9 no.1
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• pp.51-64
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• 1984

In order to obtain the basic data of movements of the mandible for diagnosis and prgnosis determination of the TMJ dysfunction, the author measured the ranges and shapes of movements of the mandibule in the frontal, sagittal and horizontal trajectory with Saphon Visi-Trainer C-Ⅱ(Tokyo Shizaisha Inc.) in 61 men. The subjects who were undergraduate and graduate students of the School of Dentistry, Seoul Nationa University(SNU) had no pain or symptoms of dysfunction of the masticatory system. The obtained results were as follows: 1. The mean for maximal right and left laterotrusion in the frontal trajectory were 11.3 mm and 10.9mm, respectively and didn't differ significantly. Right and left larero-opening at 15mm, 25mm and 35mm mouth opening respectively didn't differ significantly. Area of border movement of the mandible was 770.33㎟. 2. The mean for maximal protrusion in the sagital trajectory was 10.2mm, antero-posterior deviation between ICP and RCP 1.2mm and angel of maximal protrusion and horizontal plane 20.5。. 3. The mean for right and left laterotrusion is 11.1mm &11.2mm,respectively, and didn't diffef significantly.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.33 no.3
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• pp.260-262
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• 2007

Nearly 45% of all neurilemmoma occur in the head and neck area, but only 1% have an intraoral origin. The authors report two cases of uncommon neurilemmoma of the tongue. Both of them presented with a mass on the lateral border of the tongue, which was noted several days before. The lesions of tongue appeared as smooth-surfaced, well-circumscribed mass. They were excised under general anesthesia and diagnosed as neurilemmoma on histopathologic examination.

• Journal of Korea Multimedia Society
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• v.19 no.4
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• pp.774-779
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• 2016

The conventional methods using color signal for tracking the movement of the object require a lot of calculation and the performance is not accurate. In this paper, we propose a method to effectively track the moving objects using the depth information from a depth camera. First, it separates the background and the objects based on the depth difference in the depth of the screen. When an object is moved, the depth value of the object becomes blurred because of the phenomenon of Motion Blur. In order to solve the Motion Blur, we observe the changes in the characteristics of the object (the area of the object, the border length, the roundness, the actual size) by its velocity. The proposed algorithm was implemented in the simulation that was applied directly to the tracking of a golf ball. We can see that the estimated value of the proposed method is accurate enough to be very close to the actual measurement.

• Restorative Dentistry and Endodontics
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• v.25 no.4
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• pp.491-493
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• 2000

A case of a botryoid odontogenic cyst of the globulomaxillary area between the right upper lateral incisor and the canine presenting as an apical periodontal cyst was reported. The cyst showed an unilocular radiolucency with a well delineated hyperostotic border. Histologic examination revealed multiple cysts lined by one or two-cell layers, some areas demonstrated a bud-like thickening of the epithelium. Clear cells were also conspicuous, but devoid of inflammatory reaction in the cystic wall. Some considerations regarding differential diagnosis, histogenetic and biologic behaviour of the lesion were discussed.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.23 no.2
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• pp.379-384
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• 1993

The ameloblastic fibrosarcoma is the malignant counterpart of the ameloblastic fibrosarcoma in which the mesenchymal element has become malignant. Clinically it frequently occurs in the 3rd and 4th decades, and more frequent in the mandible than in the maxilla. Radiographic features are apparent multilocular radiolucency with ill-defined border. The authors experienced two cases of ameloblastic fibrosarcoma of the mandible in a 26-year-old male and a 48-year-old female patients who suffered from pain and swelling on the affected area. And we discussed the clinical, radiological and histopathological features of this disease with a brief review of the literatures.

• Imaging Science in Dentistry
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• v.42 no.4
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• pp.261-263
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• 2012

Developmental salivary gland defect is a bone depression on the lingual surface of the mandible containing salivary gland or fatty soft tissue. The most common location is within the submandibular gland fossa and often close to the inferior border of the mandible. This defect is asymptomatic and generally discovered only incidentally during radiographic examination of the area. This defect also appears as a well-defined, corticated, unilocular radiolucency below the mandibular canal. Although it is not uncommon for this defect to appear as a round or ovoid radiolucency, multilocular radiolucency of these defects is relatively rare. This report presents a case of a developmental salivary gland defect with multilocular radiolucency in a male patient.

• Journal of the Korean Institute of Educational Facilities
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• v.26 no.6
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• pp.51-58
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• 2019

This study embody the investigation of the winner projects of Young Architecture Program(YAP) taken place annually at front yard of MoMA PS1 since 1998. Every installation of project is experimental exhibition that have ambiguous border in the area between lightness and architecture. Thus the design have less limits as architectural space and talents can express the innovative idea strong. This paper aims to probe annual significant key words by analyzing the contemporary representative space types, materials, fabrication methods and innovative ideas, and to identify the changes of important concept of lightness and recent trend in architect design concept.