• International Journal of Advanced Culture Technology
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• 제9권4호
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• pp.295-301
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• 2021

Digital media technology is gradually developing with the development of convergence quaternary industrial technology and mobile devices. The combination of deep learning and augmented reality can provide more convenient and lively services through the interaction of 3D virtual images with the real world. We combine deep learning-based pose prediction with augmented reality technology. We predict the eight vertices of the bounding box of the object in the image. Using the predicted eight vertices(x,y), eight vertices(x,y,z) of 3D mesh, and the intrinsic parameter of the smartphone camera, we compute the external parameters of the camera through the PnP algorithm. We calculate the distance to the object and the degree of rotation of the object using the external parameter and apply to AR content. Our method provides services in a web environment, making it highly accessible to users and easy to maintain the system. As we provide augmented reality services using consumers' smartphone cameras, we can apply them to various business fields.

• 한국안광학회지
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• 제20권2호
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• pp.117-124
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• 2015

목적: 모노비전, 변형된 모노비전 및 비구면 멀티포컬 소프트콘택트렌즈로 교정 시 20대 성인에서 근거리 작업 후 조절기능의 변화를 비교하였다. 방법: 30명의 젊은 성인($23.53{\pm}2.37$세)을 대상으로 모노비전, 단초점 콘택트렌즈와 낮은 가입도의 중심부-근용 비구면 다초점 콘택트렌즈를 활용한 변형된 모노비전, 멀티포컬 콘택트렌즈의 교정방법을 사용하여 양안에 착용시키고, 일주일의 적응기간이 경과한 후 조절기능을 검사하였다. 조절기능 평가는 콘택트렌즈를 착용하고 1시간 동안 동영상을 시청하여 조절 부담을 유도한 후 원/근거리의 100%와 10% 대비시력, 조절반응, 근거리 조절용이성, 양성/음성상대조절력 등을 평가하였다. 모든 검사는 양안으로 실행하였다. 결과: 원거리 10% 대비시력은 모노비전에서 가장 낮았다(p<0.005). 조절반응량은 검사거리 1 m(1.00 D)에서 모노비전이 변형된 모노비전보다 작았고, 검사거리 40 cm(2.50 D)에서는 모노비전이 변형된 모노비전, 멀티포컬 콘택트렌즈보다 작았다(p<0.05). 근거리 조절용이성, 양성/음성상대조절력은 콘택트렌즈 교정법 사이에 차이가 없었다. 결론: 20대 성인에서 낮은 가입도의 모노비전 처방은 단초점렌즈보다 근거리 조절반응을 줄여주지만 중심부-근용 멀티포컬 콘택트렌즈를 이용한 '변형된 모노비전'과 멀티포컬 콘택트렌즈 처방은 조절이완에 영향을 주지 않는 것으로 생각된다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제39권2호
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• pp.71-76
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• 2013

Objectives: In three-dimensional computed tomography (3D-CT), the cant is evaluated by measuring the distance between the reference plane (or line) and the tooth. The purpose of this study was to determine the horizontal skeletal reference plane that showed the greatest correlation with clinical evaluation. Materials and Methods: The subjects were 15 patients who closed their eyes during the CT image taking process. The menton points of all patients deviated by more than 3 mm. In the first evaluation, clinical cant was measured. The distance from the inner canthus to the ipsilateral canine tip and the distance from the eyelid to the ipsilateral first molar were obtained. The distance between the left and right sides was also measured. In the second evaluation, skeletal cant was measured. Six reference planes and one line were used for the evaluation of occlusal cant: 1) FH plane R: Or.R - Or.L - Po.R; 2) FH plane L: Or.R - Or.L - Po.L; 3) F. Ovale plane R: Rt.F.Ovale - Lt.F.Ovale - Or.R; 4) F. Ovale plane L: Rt.F.Ovale - Lt.F.Ovale - Or.L; 5) FZS plane R: Rt.FZS - Lt.FZS - Po.R; 6) FZS plane R: Rt.FZS - Lt.FZS - Po.L, and; 7) FZS line: Rt.FZS - Lt.FZS. Results: The clinical and skeletal cants were compared using linear regression analysis. The FH plane R, FH plane L, and FZS line showed the highest correlation (P<0.05). Conclusion: The FH plane R and FH plane L are the most appropriate horizontal reference plane in evaluation of occlusal cant on 3D-CT.

• 치과방사선
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• 제14권1호
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• pp.135-140
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• 1984

In spite of many projections of TMJ, there are rarely satisfactory projections of TMJ. The author traced and measured the P-A cephalograms, which number is 70 in each male and female, them finding the following results. 1. The long axis of the condyle is 19.80㎜ on the right, and 19.89㎜ on the left in male, and that of 18.65㎜ on the right and 18.10㎜ on the left in female. 2. The intercondylar distance is 119.02㎜ in male, and 108.20㎜ in female, resulting that the intercondylar distance in male is much longer than that in female. 3. The right and left deviation of the midline passing through the center of the intercondylar distance and prosthion is +0.37㎜ in male, +0.64㎜ in female, and its range is from -4.6 to +5.7㎜ in male, and from -3.2 to +6.1㎜ in female, resulting that prosthion nearly coincides with midline. 4. The angle of the intercondylar distance and the long axis (vertical angle) is +5.48' in male, and +6.02' in female, resulting that there is a little difference between male and female and the angle of the right is greater than that of the left in both male and female. 5. The typology of the condyle in sum of male and female is; Right: A type 55 (39.3%), B type 66 (47.1%), C type, 12 (8.6%), D type, 7 (5.0%), E type, 0 (0%) Left: A type, 60 (42.9%), B type, 58 (41.4%), C type, 14 (10.0%), D type, 8 (5.7%), E type, 0 (0%) 6. The distribution of the typology between the right and the left is; AA 26 (18.6%), AB 50 (35.7%), AC 10 (7.1%), AD 3 (2.1%) BB 26 (18.6%), BC 13 (9.3%), BD 9 (6.4%), CC 0 (0%), CD 3 (2.1%)

• 대한치과교정학회지
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• 제46권5호
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• pp.269-279
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• 2016

Objective: Rapid maxillary expansion (RME) is used to expand the maxilla and increase arch perimeter; yet, there are few reports on its effects on the sphenoid bone. With cone-beam computed topography (CBCT), it is possible to visualize sphenoid bone changes. The purpose of this study was to investigate sphenoid bone changes observed in conjunction with RME treatments, using CBCT. Methods: Sixty patients (34 women and 26 men, aged 11-17 years) underwent RME as part of their orthodontic treatment. Patients were randomly assigned to one of three groups: a tooth-anchored group, a bone-anchored group, or a control group. Initial CBCT scans were performed preceding the RME treatment ($T_1$) and again directly after the completion of expansion ($T_2$). Statistical analysis included ANOVA, descriptive statistics, and the intraclass correlation coefficient (ICC). Results: The reliability of the landmark location was at least 0.783, and the largest ICC mean measurement error was 2.32 mm. With regard to distances, the largest change was 0.78 mm, which was not statistically significant (p > 0.05). Statistical significance was established in patient groups of the same sex and treatment type for the following distance measurements: right anterior lateral pterygoid plate to the right edge of the hypophyseal fossa ($d_2$), anterior distance between the medial pterygoid plates ($d_4$), and anterior distance between the left medial and lateral plates ($d_8$). Conclusions: In this study, there were no clinically significant changes in the sphenoid bone due to RME treatments regardless of sex or treatment type.

• 생명과학회지
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• 제17권10호
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• pp.1400-1405
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• 2007

SD계 흰쥐를 사용하여 motor activity 실험에서 동물들의 자발적인 운동성을 측정한 결과, 주어진 시간 내 움직인 시간과 움직인 거리에는 n-3 지방산이 결핍된 식이군(Def group)과 DHA가 첨가된 식이군(Def +DHA group)간에 유의적 차이를 관찰할 수가 없었다. 학습효과 실험에서 n-3 지방산이 결핍된 식이군(Def group)의 경우 목적 플래트폼까지 걸리는 시간이 DHA 첨가 식이군(Def +DHA group)에 비하여 유의적으로 길었음을 관찰할 수가 있었다(p<0.05). 수영한 거리(swimming distance)와 수영 속도(swimming speed)의 경우 수영 속도에는 유의적 차이가 없었으나 n-3 지방산이 결핍된 식이군(Def group)의 경우, DHA 첨가 식이군(Def +DHA group)에 비해 수영 풀에서 움직인 거리가 유의적으로 길었다(p<0.05). 두 식이군의 흰쥐들이 수영한 시간(swimming time)과 쉬고 있는 시간(resting time)의 경우, 쉬는 시간에는 유의적 차이가 없었으나 수영 시간 또한 n-3 지방산이 결핍된 식이(Def group)로 사육된 쥐가 DHA가 첨가된 식이로 사육된 쥐(Def +DHA group)보다 수영한 시간이 유의적으로 길었다(p<0.05). 기억력 테스트에서 n-3 지방산이 결핍된 식이군(Def group)의 경우 원래 A 지역에 대한 기억이 낮아서 A 지역을 지나가는 횟수가 다른 지역 B, C, D를 지나는 횟수와 유의적 차이가 없었다. 반면, DHA가 첨가된 식이군(Def +DHA group)의 경우 목적 플래트폼이 있었던 A 지역에 대한 기억으로 다른 지역인 B, C, D보다 지나가는 횟수가 유의적으로 많았음을 관찰하였다(p<0.05). 이상의 결과로부터 임신에서부터 성인이 될 때까지 n-3 지방산이 결핍된 식이로 사육된 쥐와 비교할 때 DHA가 첨가된 식이로 사육된 흰쥐가 Morris water maze를 이용한 공간기억력 실험에서 우수한 기억 학습효과를 나타냄을 알 수가 있었고 이러한 결과는 n-3와 n-6 지방산의 균형적인 섭취의 중요성을 부각시키고 있다.

• Bulletin of the Korean Chemical Society
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• 제34권3호
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• pp.773-776
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• 2013

We have prepared 1-D BiSI and 2-D BiOI nanostructures, and characterized them by scanning electron microscopy, transmission electron microscopy (TEM), X-ray diffraction crystallography, thermogravimetric analysis/differential scanning calorimetry, and UV-visible absorption. Here, we first report clear HR-TEM image of BiSI. In addition, we first found that the growth direction of BiSI is [12-1] plane, with the neighboring distance of 0.30 nm. The crystal structures of BiSI and BiOI are found to be orthorhombic (Pnam) and tetragonal (P4/nmm), respectively. The absorption band gaps of BiSI and BiOI are measured to be 1.55 and 1.92 eV, respectively. Our study could further highlight the applications of V-VI-VII compounds.

• Journal of Photoscience
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• 제4권2호
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• pp.61-67
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• 1997

The model based on the idea that the p$_y$-orbital of the carbonyl oxygen is responsible to receiving hydrogen was devised for simulation of intramolecular hydrogen transfer. A Monte Carlo method was applied to free rotation of a molecular chain performed by changing the dihedral angles, and a "hit" was defined as the case when the migrating hydrogen comes within the region defined as the p$_y$-orbital and satisfies all the geometrical requirements for abstraction. A set of parameters was employed for defining the region and the requirements; $\tau$ was defined as the angle formed between O...H vector and its projection on the mean plane of the carbonyl group (- 43$\circ$ < $\tau$ < + 43$\circ$), $\Delta$ as the C=O...H angle (90 -15$\circ$ < $\Delta$ < 90 + 15$\circ$), $\theta$ as the O...H - C angle ( 180 - 80$\circ$< 0 < 180 + 80$\circ$), d as the distance from the center of the lobe of the p$_y$-orbital to hydrogen (0 < d < 1.04 ${\AA}$). The minimum value for the distance between carbonyl oxygen (O$_1$) and the migrating hydrogen (H$_i$) and for that between non-bonded atoms except the pair of O$_1$ and H$_i$ were assumed to be 0.52 ${\AA}$ and 1.54 ${\AA}$, respectively. The apphcation of this model to intramolecular $\beta$-, $\gamma$-, $\delta$-, $\epsilon$-, and $\zeta$-hydrogen abstraction in ketones and $\eta$- and $\theta$- proton transfer in oxoesters gave good results reflecting their photochemical behavior. The model was also used for prediction of photoreactivities of 2-(N,N-dibenzylamino)ethyl 2-, 3- and 4-benzoylbenzoate (1a - c). (1a - c).

• 대한디지털의료영상학회논문지
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• 제13권1호
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• pp.39-48
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• 2011

Uses a Tomographic scan image and Table Object Distance(TOD) price after measuring, uses accuracy and usability of blood vessel diameter(Vessel Diameter) measurement under comparison evaluating boil TOD Calibration. The patient who enforces Prosecuting Attorney abdomen Tomographic scan in the object the superior mesentery artery uses PACS View from abdomen fault image and from blood vessel diameter and the table measures the height until of the blood vessel. Uses Angio Catheter from Angiography(5 Fr.) and enforces is measured from PACS View the height until of the table which and the blood vessel at TOD Calibration price and the size of the superior mesentery artery inputs measures an superior mesentery artery building skill. Catheter Calibration input Agnio Catheter where uses in Angiography the size of the superior mesentery artery at Catheter Calibration price and they measure. Produced an accuracy from monitoring data and comparison evaluated. The statistical program used SPSS. TOD Calibration accuracy was 96.53%, standard deviation is 0.03829. Catheter Calibration accuracy of 92.91%, standard deviation is 0.05085. Represents a statistically significant difference(p = 0). According to age and gender was not statistically significant(p > 0.05). TOD Calibration correlation coefficient R-squared of 88.8%, Catheter Calibration of the R-squared is 75.5%. High accuracy of both methods. Through this study, CT images using the measured distance between the table and the Object, TOD Calibration accuracy higher than two Catheter Calibration was measured. TOD and Catheter Calibration represents a statistically significant difference(p = 0).

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 추계학술대회논문집B
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• pp.87-92
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• 2000

This study is to investigate the heat transfer characteristics the for a round turbulent jet impinging on the flat plate with and without rib. Liquid crystal/transient method was used to determine the Nusselt number distributions along the surface. The temperature on the surface was measured using liquid crystal and a digital color image processing system. The experiments were made fur the jet Reynolds number (Re) 23,000, the dimensionless nozzle-to-surface distance (L/d) from 2 to 10, and the rib type [height ($d_1$) 2mm, pitch (p) from 12 to 36mm]. It was found that for $L/d{\ge}6$ the average Nusselt numbers on the flat plate with rib type C ($p/d_1=16$) are higher than those without rib, mainly due to an increase in the turbulent intensity caused by flow separation, recirculation and reattachment on the wall surface.