• 한국멀티미디어학회:학술대회논문집
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• 한국멀티미디어학회 2012년도 춘계학술발표대회논문집
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• pp.205-208
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• 2012

Nowadays GPU (Graphic Process Unit) is not only used to show and render some images, but also for another computation. In this paper, we tried to use GPU to do some morphology operations to remove skull from axial MRI images. This skull removing process is an important step in brain segmentation because we would like to work with the brain only, without any skull on it. The result shows that simple morphology operations to remove skull has been successfully applied on MRI images, but there are still many parts that can be develop to get better images.

• 한국환경생태학회지
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• 제30권1호
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• pp.39-47
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• 2016

한반도에 서식하는 노루의 계통분류학적 위치는 아직까지 명확하게 정리되어 있지 않으며, 최근까지 내륙과 제주도 지역에 서식하는 노루 간 외부형태와 유전학적 차이가 있다고 여러 차례 보고되고 있다. 따라서 본 연구는 외부형태와 유전적으로 차이가 나타나 두 아종으로 여겨지는 내륙과 제주도 노루의 머리뼈 특성에 있어서도 차이가 있을 것으로 생각하고, 그 차이를 비교 분석하여 한국노루의 분류학적 위치를 좀 더 명확하게 규명하고자 실시하였다. 총 50개체의 성체 노루 머리뼈를 비교 분석한 결과 머리뼈최대길이, 뒤통수뼈관절융기-치조점사이길이, 머리뼈바닥길이, 머리뼈최대폭, 광대뼈사이폭, 눈확사이폭, 얼굴길이, 위어금니열길이 등에서 유의한 차이가 나타나 제주노루가 내륙노루 보다 머리뼈의 크기 및 형태가 작은 것으로 나타났다. 두개골의 형태는 노루 아종 간 차이를 결정하는 중요한 요소이며, 위도, 경도, 고도에 직접적인 영향을 받지는 않지만 이 요소들이 1차 생산자에 영향을 미쳐 먹이식물에 변화를 가져오고 노루의 먹이 선택과 연관되어 순차적으로 두개골 형태에도 영향을 미친다. 따라서 한반도에 서식하는 노루 두개골의 계량형태학적 특성을 비교 분석한 결과 내륙 노루는 아종인 C. p. tianschanicus와 비슷한 반면, 제주 노루는 시베리아노루 3아종 및 유럽노루와 확연한 차이를 나타냈다. 이상의 결과를 종합해 볼 때 제주도 지역에 서식하는 노루의 경우 제주도에만 서식하는 고유종으로 아종 수준의 분류가 가능할 것으로 생각한다.

• Animal Systematics, Evolution and Diversity
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• 제6권1호
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• pp.1-16
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• 1990

모래무지아과에 대한 계통분류학적 연구의 일환으로 한국 고유종인 쉬리 Coreoleuciscus splendidus Mori의 두골 및 두부표면근육을 기재하고 잉어과에 해당하는 다른 어류들과 비교해부학적으로 검토하였다. 본 조사의 결과 본 종은 설이골의 측돌기와 미설골이 잉어과 어류들 중에서도 매우 특이하게 나타났다. 한편 사부의 형태, 두부측선감각관의 구조, 부설골과 익설골 및 전이골의 관계, 미설골의 형태, 기설골의 형태, 하새골의 형태 및 adductor mandiblulae complex의 조성 등에 있어서 모래무지아과의 진정 저루성 어류와는 뚜렷한 차이를 보였다. 본 연구에서는 이러한 형질들과 관련지어 본 종이 잉어과 내에서 차지하는 분류학적 위치에 대해 논의하였다.

• 한국환경과학회지
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• 제32권4호
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• pp.277-284
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• 2023

Seventy Pipistrellus abramus samples were caught to analyze their sexual dimorphism and mophological characteristics. The mean HB and FA were 50.86 mm and 34.93 mm, respectively, based on external measurements and skull shape. The length of the TL, Hfcu, and Tra were approximately 70%, 55.6%, and 38% of the HB, Tib, and E, respectively. Both the lambdoid crest and the sagittal crest were well developed and the H.BC was approximately 84% of the W.BC. P2 was inside the toothrow and metacone of canine was clearly visible. According to the analysis of sexual dimorphism, the following characteristics were different in between males and females: WS, C-M³, C-C, M³-M³, LOM, LUC, and i-m³. The WS, C-M³, C-C, M³-M³, LOM, and i-m³ were bigger in females than males, whereas the LUC was bigger in males.

• Journal of International Society for Simulation Surgery
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• 제3권1호
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• pp.22-27
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• 2016

Background Craniosynostosis management using distraction osteogensis represent a challenge for surgeons due to the great variability of the skull deformity even within the same etiology. The ability to apply the simulation surgery for improving the preoperative planning for distraction osteogensis could improve the results.Planning and Simulation 14 patients presented with craniosynostosis had been subjected to simulation surgery prior to real surgery. 3D CT scans was obtained upon patient admission. Adjustment of all skull position to Frankfort horizontal plane was done. 3 different distraction osteogensis plans were done for each patient according to the skull morphology. For each plane, movement for each bone segment was done according to the pre-planned distraction vectors. Also the distances of distractions were pre-determined according to the cephalic index as well as brain volume. Intraoperatively, we choose the most appropriate plan for the patient by the surgeon. At the end of distraction, 3D CT scan was obtained, and was compared to the simulation plan. Also the distance and the direction of distraction was compared to that of the plan. Accordingly, the distance was almost matching that of the simulation surgery, however the vector of distraction was not matched.Conclusion Preoperative stimulation planning for craniosynostosis patient is very valuable tool in the surgical management of craniosynostosis patients.

• 치과방사선
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• 제21권2호
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• pp.297-306
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• 1991

The purpose of this study is to improve the availabilities of radiographic technics as diagnostic methods to evaluate maxillary sinus in dental clinic. For the morphologic study of maxillary sinus, 20 dry maxillas were used and intraoral standard views, orthopantomograms, and skull P-A views were taken. For measuring the vertical image magnification rates, 5 sites in maxillary molar regions of 5 dry mandibles were selected radndomly and 25 wires of the determined sizes for selected portions were attached to the sites, after then, intraoral radiograms with bisecting technic and orthopantomograms were taken. The acquired results were as follows: 1. The anterior extension of the maxillary sinus on orthopantomogram was the distal side of the canine in 45.45% of subjects, the mesial side of the canine in 27.27%, the lateral incisor in 9.09%, the mesial side of the 1st premolar in 9.09%, and the mesial side of the 2nd pre-molar in 9.09%. 2. The positional relationship between the floor of maxillary sinus and the apex of alveolar socket revealed superimposed type in 58.3% of subjects, approached type in 33.3%, and separated type in 8.4%. 3. The morphology of inferior border of maxillary sinus was simple V or U shape in edentulous stage and V or wide U shape in alveolar socket stage. 4. The vertical image length on intraoral film taken by bisecting technic was magnified by 27.23% on the average and the length on orthopantomogram by 12.35%. 5. The inferior borders of maxillary sinus coinciding with each of the areas bearing the anterior and the posterior teeth on skull P-A view were determined.

• 한국환경과학회지
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• 제26권4호
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• pp.529-533
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• 2017

Sightings of long-tailed bats have only been recorded twice in Korea, and their morphology and ecology are virtually unknown. We captured a female long-tailed bat in May 2016, in Gangwon Province, and to the best of our knowledge, this has been done for the first time in approximately 30 years. The captured bat had a very small craniofacial area and the length of its tibia was > 19 mm. The wing membrane penetrated the distal portion of the metatarsus of its first toe. The fur of the bat had a lusterless yellowish-brown color and its terminal tail vertebra was free beyond the posterior edge of the uropatagium. It had an obvious lambdoid crest on the lateral side. The anterior and central premolars were located inward with respect to the tooth row. In the mandible, the central premolar was located slightly inward and was nearly 80% of the anterior premolar in height.

• 한국결정성장학회지
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• 제31권5호
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• pp.228-232
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• 2021

페로브스카이트 구조를 가지는 Ca_1-xZrO₃:xPr 형광체를 스컬용융법으로 합성하였다. 합성한 형광체의 결정구조, 형태 및 광학적 특성은 XRD, SEM, 자외선 형광반응 및 광발광을 통해 분석하였다. XRD 측정에서는 CaZrO₃:Pr³⁺의 단결정이 페로브스카이트 구조의 사방정계로 분석되었다. 합성된 형광체는 254 nm의 UV 광에 의해 여기 될 수 있고 방출 스펙트럼 결과는 506, 536 및 548 nm에서 전하전이 ³P₀ → ³H₄, ³P₁ → ³H₅ 및 ³P₀ → ³H₅로 인해 CaZrO₃:Pr³⁺는 녹색 발광이 우세하였다.

• 한국결정성장학회지
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• 제27권1호
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• pp.42-46
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• 2017

스컬용융법으로 $SrAl_2O_4$ : $Eu^{2+}$,$Dy^{3+}$ 형광체 합성을 하였으며, 합성한 형광체의 산화물 몰비는 $SrCO_3$ : $Al(OH)_3$ : $Eu_2O_3$ : $Dy_2O_3$= 1 : 2 : 0.015 : 0.02였다. 결정구조 및 표면 형상은 X-선 회절분석과 주사전자현미경으로 규명하였다. 합성한 $SrAl_2O_4$ : $Eu^{2+}$,$Dy^{3+}$의 광학적 특성인 여기, 발광 및 장잔광 특성의 심도 있는 연구를 위해 PL(photoluminescence) 분광계로 측정하였다. PL 측정을 통해 360 nm 영역에서 여기(excitation)되고, 300~420 nm의 파장까지 여기가 일어남을 확인하였다. 발광(emission)스펙트럼은 450~600 nm의 파장에서 폭넓은 스펙트럼을 보였으며, 530 nm에서 최대 발광파장을 나타내었다. $SrAl_2O_4$ : $Eu^{2+}$,$Dy^{3+}$ 형광체는 오랜 시간 동안 발광하는 장잔광 특성을 나타내었다.

• 대한수의학회지
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• 제53권3호
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• pp.155-158
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• 2013

Paedomorphosis is the retention of juvenile morphology at maturity and is important in generating evolutionary change in domestic species and species in the wild. This preliminary study compared morphological characteristics of seven domestic cat pure breeds and felid species from around the world. An original procedure based on elliptical Fourier (EF) methods was applied to head lateral views of specimens and were assessed in order to analyse head profile. For comparative purposes three domestic kittens of different ages and three species of genus Lynx were also used. EF descriptors, allowed for the quantification of the head profile. Using the Fourier transform, reconstruction of the mean head profile revealed that there was a general shape difference between wild cats, domestic cats and kittens. Results suggested that variability in head profile differentiate quite well between adult cats and kittens, but domestic and wild cats appeared grouped into a similar cluster. The similarity between breeds can thus be attributed more to the general head profile than to flatness, i.e. to the general conformation rather than facial profile. Therefore, no effect of paedomorphism on the studied breeds can be undertaken. The present approach opens interesting ethnological perspectives for the aloidic characterisation for domestic breeds.