신제품 개발을 위한 GAN 기반 생성모델 성능 비교

이동훈,이세훈,강재모,Lee, Dong-Hun,Lee, Se-Hun,Kang, Jae-Mo 국제문화기술진흥원 2022 The Journal of the Convergence on Culture Technolo Vol.8 No.6

Amid the recent rapid trend change, the change in design has a great impact on the sales of fashion companies, so it is inevitable to be careful in choosing new designs. With the recent development of the artificial intelligence field, various machine learning is being used a lot in the fashion market to increase consumers' preferences. To contribute to increasing reliability in the development of new products by quantifying abstract concepts such as preferences, we generate new images that do not exist through three adversarial generative neural networks (GANs) and numerically compare abstract concepts of preferences using pre-trained convolution neural networks (CNNs). Deep convolutional generative adversarial networks (DCGAN), Progressive growing adversarial networks (PGGAN), and Dual Discriminator generative adversarial networks (DANs), which were trained to produce comparative, high-level, and high-level images. The degree of similarity measured was considered as a preference, and the experimental results showed that D2GAN showed a relatively high similarity compared to DCGAN and PGGAN.

다공성 흑연 소재를 이용한 바나듐 도핑된 반절연 SiC 단결정 성장의 특성 연구

이동훈,김황주,김영곤,최수훈,박미선,장연숙,이원재,정광희,김태희,최이식,Lee, Dong-Hun,Kim, Hwang-Ju,Kim, Young-Gon,Choi, Su-Hun,Park, Mi-Seon,Jang, Yeon-Suk,Lee, Won-Jae,Jung, Kwang-Hee,Kim, Tae-Hee,Choi, Yi-Sik 한국결정성장학회 2016 한국결정성장학회지 Vol.26 No.6

본 연구에서는 다공성 흑연 캡슐에 Vanadium carbide(VC) 분말을 채워 성장시킨 방법과 SiC 분말과 VC 분말을 혼합하여 다공성 흑연판을 그 위에 덮은 후 성장시키는 방법으로 진행하였으며, 성장된 결정들은 여러 분석방법을 사용하여 각각의 특성들을 관찰하였다. 반절연 SiC 성장은 6H-SiC 종자 결정을 사용하여 PVT(Physical Vapor Transport)법으로 성장을 진행하였다. 반절연으로 성장된 SiC 결정은 XRD를 이용하여 6H-SiC인 것을 확인하였으며, SIMS 분석결과 바나듐 도핑 농도가 바나듐 용해의 한계값 보다 높을 경우 석출물이 발생되며, 결정 품질 저하의 원인이 됨을 확인할 수 있었다. Vanadium-doped SiC crystals have been grown by using a porous graphite inner crucible filled with vanadium carbide (VC) and by using a porous graphite plate and SiC + VC powders, respectively. Semi-insulating SiC crystals were grown onto the 6H-SiC seed crystals by PVT (Physical Vapor Transport) method. The grown crystals were indicated to be 6H-SiC polytype by XRD. As result of SIMS analysis, vanadium-rich precipitates were observed when the vanadium concentration was relatively higher than the maximum solubility of vanadium ($3-5{\times}10^{17}cm^{-3}$) in vanadium-doped SiC crystals, which resulted in degradation of crystal quality.

하악골 부분절제술 시행한 부분 무치악 환자에서 보철 수복 증례

이동훈,유동수,이종혁,Lee, Dong-Hun,Yoo, Dong-Soo,Lee, Jong-Hyuk 대한치과보철학회 2015 대한치과보철학회지 Vol.53 No.1

하악골 연속성의 상실은 하악 기능의 균형과 대칭에 영향을 주며, 하악의 움직임에 변화를 유발하고 절제된 부위로 잔존하악골을 편위시킨다. 또한 연하, 발음, 하악의 운동, 저작, 호흡과 같은 다른 부분에서도 기능이상을 나타낸다. 하악골의 일부가 결손된 환자의 경우, 일반적으로 외과적 재건에 이어 보철적 수복이 이루어진다. 하지만 BRONJ (Bisphosphonate related osteonecrosis of the Jaw)와 같은 전신적 질환을 가진 환자의 경우, 외과적 재건의 적용에 제한이 있게 되고 전적으로 보철적 수복에 의지하게 된다. 다양한 보철적 방법이 하악의 변위를 최소화하고 저작 효율과 기능 및 심미를 개선하기 위하여 제시되었다. 가철성 국소의치로 치료 시, 입술, 뺨, 혀의 운동에 의해 측방 및 수평력이 발생하며 기능 인상을 통해 이를 최대한 줄여 주어야 한다. 또한, Twin occlusion을 사용하면 적절한 구순 및 협측의 지지를 얻으면서 교합관계의 형성을 가능하게 할 수 있다. 이 증례보고에서는 하악골 결손 증례에서 중립대 인상 방법과 twin occlusion을 통하여 기능적 심미적으로 만족할 만한 결과를 얻었기에 이를 보고하고자 한다. Loss of continuity of the mandible destroys the balance and symmetry of mandibular function, leading to altered mandibular movements and deviation of the residual fragment towards the resected side. Apart from deviation, other dysfunctions include difficulty in swallowing, speech, mandibular movements, mastication, and respiration are accompanied. In general, surgical reconstruction is considered first then proceeds to the prosthetic restorations. However, patients with systemic disease such as BRONJ (Bisphosphonate related osteonecrosis of the Jaw), surgical reconstruction may be limited. Thus, the prosthetic restoration remains as the only resort. Numerous prosthetic methods are employed to minimize deviation and to improve masticatory efficiency, function and esthetics. If a removable partial denture is the selected treatment modality, maximum stability of the partial denture base may be accomplished with a functional impression procedure by means of eliminating lateral and horizontal forces caused by the functional movements of the lips, cheeks and tongue. Also, Twin occlusion is used to obtain a favorable occlusal relationship and check support for esthetics. The purpose of this case report is to demonstrate how neutral zone impression technique and twin occlusion scheme were applied to restore a hemi-mandiblectomy patient with BRONJ syndrome to achieve satisfactory results in functional and esthetic aspects.

게이트심장혈액풀 스캔에서 Half-Time 획득 인자 적용에 따른 임상적 유용성 평가

이동훈,유희재,이종훈,정우영,Lee, Dong-Hun,Yoo, Hee-Jae,Lee, Jong-Hun,Jung, Woo-Young 대한핵의학기술학회 2008 핵의학 기술 Vol.12 No.2

Purpose: The scan time reduction helps to yield more accurate results and induce the minimization of patient's motion. Also we can expect that satisfaction of examination will increase. Nowdays medical equipment companies have developed various programs to reduce scan time. We used Onco. Flash (Pixon method, SIEMENS) that is an image processing technique gated cardiac blood pool scan and going to evaluate its clinical usefullness. Materials and Method: We analyzed the 50 patients who were examined by gated blood pool scan in nuclear medicine department of Asan Mediacal Center from June $20^{th}$ 2008 to August $14^{th}$ 2008. We acquired the Full-time (6000 Kcounts) and Half-time (3000 Kcounts) LAO image in same position. And we acquired LVEF values ten times from Full-time, Half-time images acquired by the image processing technique and analyzed its mean and standard deviation values. To estimate LVEF in same conditions, we set automatic location of the LV ROI and background ROI based on same X and Y-axis. Also we performed blinding tests to physician. Results: After making a quantitative analysis of the 50 patients EF values, each mean${\pm}$standard deviation is shown at Full-time image $68.12{\pm}7.84%$, Half- time (acquired by imaging processing technique) $68.49{\pm}8.73%$. In the 95% confidence limit, there was no statistically significant difference (p>0.05). After blinding test with a physician for making a qualitative analysis, there was no difference between Full-time image and Half-time image acquired by the image processing technique for observing LV myocardial wall motion. Conclusion: Gated cardiac blood pool scan has been reported its relatively exact EF measured results than ultrasound or CT. But gated cardiac blood pool scan takes relatively longer time than other exams and now it needs to improve time competitive power. If we adapt Half-time technique to gated cardiac blood pool scintigraphy based on this study, we expect to reduce possible artifacts and improve accessibility as well as flexibility to exam. Also we expect patient's satisfaction.

동유럽 주요국의 과학기술현황 및 향후 협력방안: 폴란드, 헝가리, 체코를 중심으로

이동훈,Lee, Dong-Hun 과학기술정책연구원 1997 과학기술정책 Vol.- No.98

서울 도심 개발의 상징, 세운상가

이동훈,Lee, Dong-Hun 한국주택협회 2007 주택과 사람들 Vol.200 No.-

노후 건물과 번잡한 상점들로 인해 도심의 천덕꾸러기로 전락한 세운상가가 이제 40년 세월을 뒤로하고 새로운 서울의 상징으로 탈바꿈한다. 40년전 부터 컴퓨터.전자제품을 파는 상가 건물에 불과했던 세운상가는 앞으로 녹지와 어우러진 상업.업무용 빌딩이 들어서는 최첨단 비지니스의 중심지로 떠오를 채비를 하고 있다.

UHV-ICB 방법으로 Si(111) 기판위에 성장된 $Y_2O_3$ 박막의 구조적 특성에 관한 연구

이동훈,성태연,조만호,황정남,Lee, Dong-Hun,Seong, Tae-Yeon,Jo, Man-Ho,Hwang, Jeong-Nam 한국재료학회 1999 한국재료학회지 Vol.9 No.5

Y$_2$O$_3$films were grown on SiO$_2$-covered Si(111), and hydrogen-terminated Si(111), and hydrogen-terminated Si(111) substrates at 50$0^{\circ}C$ by ultrahigh vacuum ionized cluster beam deposition (UHV-ICB). The microstructures and growth behavior of these films have been investigated by transmission electron diffraction (TED) and high-resolution transmission electron microscopy(HREM). The TED results show that the $Y_2$O$_3$grown on the SiO$_2$-Si has the epitaxial relationship of (11-1)Y$_2$O$_3$∥(111)Si and [-110]Y$_2$O$_3$∥[-110]Si. The film on the H-Si substrate contains YS\ulcorner and amorphous YSi\ulcornerO\ulcorner layers at the interface, having the orientation relationship each other. For the YSi\ulcorner and the Si substrate, the relationship is (0001)YSi\ulcorner∥(111)Si and [1-210]YSi\ulcorner∥∥[-110]Si. For the $Y_2$O$_3$and the YSi\ulcorner ; the relationship is as follows: (11-1)Y$_2$O$_3$∥(0001)YSi\ulcorner and [-110]Y$_2$O$_3$∥[1-210]YSi\ulcorner(111)Y$_2$O$_3$∥(0001)YSi\ulcorner and [-110]Y$_2$O$_3$∥[1-210]YSi\ulcorner. Explanation is given to describe the formation mechanisms of the interfacial phases of SiO\ulcorner, YSi\ulcornerO\ulcorner and YSi\ulcorner. It is shown that the crystallinity of the $Y_2$O$_3$film on the SiO$_2$-Si(111) is better than that of $Y_2$O$_3$on H-Si(111).

해외탐방-중국에서 개최된 2004년 CJK Congress에 다녀 오면서

이동훈,Lee, Dong-Hun 한국동위원소협회 2004 동위원소회보 Vol.19 No.4

선천성 외이도 폐쇄증 및 협착증: 측두골 전산화단층촬영 소견

이동훈,김범수,정소령,김영주,천호종,최규호,Lee, Dong-Hun,Kim, Beom-Su,Jeong, So-Ryeong,Kim, Yeong-Ju,Cheon, Ho-Jong,Choe, Gyu-Ho 대한영상의학회 2002 대한영상의학회지 Vol.46 No.4

목적: 선천성 외이도 폐쇄증 및 협착증에서 측두골 및 주변 구조물에 동반되는 이상의 측두골전산화단층촬영(CT)소견을 기술하고자 하였다. 대상과 방법: 선천성 외이도 폐쇄증(일측성 11예, 양측성 1예) 및 협착증(일측성3예) 환자 15 명(남자 8명, 여자 7명, 평균연령은 15.8세), 16예에 대하여 시행한 관상면 및 축상면 측두골 CT를 후향적으로 분석하였다. 영상소견은 외이도, 고실 및 이소골, 유돌봉소, 유스타키오관 및안면신경 주행경로의 이상 여부, 하악과두 및 과상와, S상정맥동 및 경정맥구, 그리고 중두개와 기저부에 동반된 이상을 관찰하였다. 결과: 13예의 선천성 외이도 폐쇄증 중 골성 폐쇄는 12예, 막성 폐쇄는 1예에서 관찰되었고, 일측성인 경우 좌측보다 우측에(n=8, 73%)많이 발생하였다. 동반된 소견으로 고실(n=8, 62%), 유돌봉소(n=8, 62%), 하악 과두 및 과상와 (n=7, 54%),유스타키오관(n=7, 54%),중 두개와 기저부(n=8, 62%)등에 이상 소견을 보였다. 추골(n=12, 92%),침골(n=10, 77%)및 등골(n=6, 46%)의 이상이 동반되었고, 그밖에 안면신경 주행경로의 이상은 4예(31%),내이 도의 이상이 1예(8%)에서 관찰되었다. 골 외이도 협착증 3예 중 2예에서 이소골의 무형성 혹 은 하악과두 및 과상와의 위치 이상을 보였고 나머지 1예에서는 동반 기형이 없었다. 결론: 선천성 외이도 폐쇄증은 중이강 및 이소골에 이상 소견을 잘 동반하며, 상대적으로 내이구조물의 이상은 드물었다. 또한 주변의 유돌기, 유스타키오관, 하악과두, 과상와, 정맥동,안면신경 주행경로 등에도 이상이 동반되며, 측두골 CT는 이러한 소견을 평가하는데 유용하다. Purpose: To determine the computed tomographic (CT) findings of atresia and stenosis of the external auditory canal (EAC), and to describe associated abnormalities in surrounding structures. Materials and Methods: We retrospectively reviewed the axial and coronal CT images of the temporal bone in 15 patients (M:F=8:7; mean age, 15.8 years) with 16 cases of EAC atresia (unilateral n=11, bilateral n=1) and EAC stenosis (unilateral n=3). Associated abnormalities of the EAC, tympanic cavity, ossicles, mastoid air cells, eustachian tube, facial nerve course, mandibular condyle and condylar fossa, sigmoid sinus and jugular bulb, and the base of the middle cranial fossa were evaluated. Results: Thirteen cases of bony EAC atresia (one bilateral), with an atretic bony plate, were noted, and one case of unilateral membranous atresia, in which a soft tissue the EAC. A unilateral lesion occurred more frequently on the right temporal bone (n=8, 73%). Associated abnormalities included a small tympanic cavity (n=8, 62%), decreased mastoid pneumatization (n=8, 62%), displacement of the mandibular condyle and the posterior wall of the condylar fossa (n=7, 54%), dilatation of the Eustachian tube (n=7, 54%), and inferior displacement of the temporal fossa base (n=8, 62%). Abnormalities of ossicles were noted in the malleolus (n=12, 92%), incus (n=10, 77%) and stapes (n=6, 46%). The course of the facial nerve was abnormal in four cases, and abnormality of the auditory canal was noted in one. Among three cases of EAC stenosis, ossicular aplasia was observed in one, and in another the location of the mandibular condyle and condylar fossa was abnormal. In the remaining case there was no associated abnormality. Conclusion: Atresia of the EAC is frequently accompanied by abnormalities of the middle ear cavity, ossicles, and adjacent structures other than the inner ear. For patients with atresia and stenosis of this canal, CT of the temporal bone is essentially helpful in evaluating these associated abnormalities.

방사선 치료용 MM-22 의학용 마이크로트론 가속기

이동훈,박주식,Lee Dong-Hun,Bak Joo-Shik 대한방사선치료학회 1990 大韓放射線治療技術學會誌 Vol.4 No.1

The MM-22 medical microtron at Korea Cancer Center Hospital has been running for radiotherapy since it was installed in 1986. The microtron is a very flexible radiation therapy device with excellent radiation field for photon or electron therapy. The microtron accelerates elections from an energy of minimun 5.3MeV to an energy of maximum 22.5MeV. The electrons are led from the microtron to the treatment head via a beam transport system and are used for radiotherapy. Present paper describes the system structures and operating characteristics of the MM-22 microtron and its therapy unit.