지나치게 선정적인 스포츠 신문

황영욱 한국언론학회 1993 저널리즘비평 Vol.11 No.1

Primary Mediastinal Leiomyoma Mimicking a Giant Mediastinal Cyst: A Case Report

황영욱,김수영,이병훈,황윤준,이지영,김유성,김한성 대한영상의학회 2016 대한영상의학회지 Vol.75 No.2

Primary mediastinal leiomyoma is an extremely rare benign tumor of smooth muscle. Most common radiographic appearance is a well circumscribed heterogeneous solid mass. We reported a case of giant cyst-like lesion at the middle mediastinum, which was pathologically confirmed as a primary mediastinal leiomyoma.

골스캔상 발견된 안와 병변의 임상적 의미

황영욱,차순주 대한영상의학회 2019 대한영상의학회지 Vol.80 No.1

목적 본 연구는 골스캔에서 발견된 안와 병변의 골스캔 소견을 분석하고 임상적 의미에 대해 알아보고자 하였다. 대상과 방법 2011년 1월부터 2013년 08월까지 본원에서 환자 3149명을 대상으로 시행된 골스캔을 분석하여 안와 주위에 섭취 이상 유무를 확인하였다. 안와 주위로 섭취 이상 소견이 보인 경우 안와 주위에서의 상대적인 위치와 크기를 분석하였다. 또한, 골스캔과 양전자방출단층촬영이나 전산화단층촬영과 비교하여 이상 소견이 있는지 확인하였다. 안와를 포함하는 다른 영상검사가 없는 경우 다른 골스캔에서 병변의 변화가 없는지를 비교하였다. 결과 총 13예의 안와 병변을 최종적으로 분석하였다. 안와 주위의 섭취 이상은 한쪽에서 국소적으로 나타났으며, 안와의 외상측에서 가장 많이 나타났다(46.2%). 특징적으로, 안와 주위의 내측, 하측에는 골흡수의 증가가 나타나지 않았다. 13예 중 10예(76.9%)에서 양전자단층촬영이나 전산화단층촬영과 비교하였으며, 그 결과 골스캔의 안와 병변과 대응되는 구조에 이상 소견은 관찰되지 않았다. 나머지 3예(23.1%)에서는 다른 골스캔과 비교하였으며, 골스캔 간에 안와 병변의 변화는 관찰되지 않았다. 결론 골스캔에서 안와 주위 골병변이 한쪽에서 작은 국소 병변으로 나타날 경우 비특이적인 양성 병변일 가능성이 높을 것으로 판단된다. Purpose This study is to evaluate orbital rim uptake on bone scan and to discuss their clinical significance. Materials and Methods From January 2011 to August 2013, 3149 cases of bone scans were analyzed to check for existence of uptake abnormalities in the orbital rim with relative size and position. The bone scans were compared with either positron emission tomography-computed tomography (PET/CT) or computed tomography (CT). For cases without other imaging examinations, comparisons were made with other bone scans. Results In total, 13 cases of the orbital rib uptake were ultimately evaluated. In 6 cases, the intake abnormalities of the orbital rim appeared in superior lateral aspect of the orbital rim to occupy the highest frequency (46.2%). Distinctively, bone scans showed no abnormal uptake in medial and inferior aspect of orbital rim. The 10 cases are compared with PET/CT or CT and as a result, there are no abnormalities that correspond to the orbital lesions of bone scans. The 3 cases were compared with other bone scans and no changes in the orbital lesions were confirmed between the bone scans. Conclusion There is an unilateral, small, focal orbital rim uptake on bone scans to be possibility of nonspecific benign lesions.

Numerical Analysis Using Finite Element Method On Phosphorescent Organic Light Emitting Diodes

황영욱,이형기,원태영 대한전자공학회 2014 Journal of semiconductor technology and science Vol.14 No.1

In this paper, we report our numerical simulation on the electronic-optical properties of the phosphorescent organic light emitting diodes (PHOLEDs) devices. In order to calculate the electrical and optical characteristics such as the transport behavior of carriers, recombination kinetics, and emission property, we undertake the finite element method (FEM). Our model includes Poisson’s equation, continuity equation to account for behavior of electrons and holes and the exciton continuity/ transfer equation. We demonstrate that the refractive indexes of each material affect the emission property and the barrier height of the interface influences the behavior of charges and the generation of exciton.

Variations of Persistent Trigeminal Artery Terminating in the Anterior Inferior Cerebellar Artery: A Case Report

황영욱,김진우,이병훈,황윤준 대한영상의학회 2016 대한영상의학회지 Vol.75 No.4

vascuPersistent trigeminal artery (PTA) is a rare condition that represents a remnant fetal anastomosis between the carotid artery and basilar artery. PTA typically arises from precavernous portion of the internal carotid artery (ICA) to the basilar artery. Variations of PTA extending from the ICA and directly terminating as cerebellar arteries without jointing basilar artery are particularly rare. We presented the extremely rare case of the variations of PTA, which directly terminate in the ipsilateral anterior inferior cerebellar artery. In addition, we reviewed the embryogenesis and clinical implication of this anomaly.

Effect of Inserting a Hole Injection Layer in Organic Light-emitting Diodes: A Numerical Approach

이형기,황영욱,원태영 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.1

For investigating the effect of inserting a hole injection layer (HIL), we carried out a computationalstudy concerning organic light-emitting diodes (OLEDs) that had a thin CuPc layer as the holeinjection layer. We used S-TAD (2, 2’, 7, 7’-tetrakis-(N, Ndiphenylamino)-9, 9-spirobifluoren) forthe hole transfer layer, S-DPVBi (4, 4’-bis (2, 2’-diphenylvinyl)-1, 1’-spirobiphenyl) for the emissionlayer and Alq3 (Tris (8-hyroxyquinolinato) aluminium) for the electron transfer layer. This tri-layerdevice was compared with four-layer devices. To this tri-layer device, we added a thin CuPc layer,which had a 5.3 eV highest occupied molecular orbital (HOMO) level and a 3.8 eV lowest unoccupiedmolecular orbital (LUMO) level, as a hole injection layer, and we chose this device for Device A. Also, we varied the LUMO level or the HOMO level of the thin CuPc layer. These two devices wereidentified as Device C and Device D, respectively. In this paper, we simulated the carrier injection,transport and recombination in these four devices. Thereby, we showed the effect of the HIL, andwe demonstrated that the characteristics of these devices were improved by adding a thin layer ofCuPc between the anode and the HTL.

Finite Element Study on the Micro-cavity Effect in OLED Devices

이형기,황영욱,원태영 대한전자공학회 2014 Journal of semiconductor technology and science Vol.14 No.1

In this paper, we discuss on the optimal design scheme of the bilayer OLED (Organic Light Emitting Diodes) with micro-cavity structure. We carried out the optical simulation on the OLED device and calculated optimal scale of devices with taking the micro-cavity effect into account. Our emission model is based upon an ensemble of radiating dipole antennas. Consequently, we applied Maxwell’s equation to this sequence, followed by the analysis on the electrical behaviors of OLED device using Poisson’s equation. It contains carrier injection and transportation mechanism. In this process, we found out the thickness of each layer can affect the recombination rate at the emission layer. Therefore, we optimized the thickness of each layer to improve the efficiency of the device.

“우리도 한 마디 합시다”

송준희,한혜경,이상엽,황영욱 한국언론학회 1993 저널리즘비평 Vol.11 No.-

Expert-level segmentation using deep learning for volumetry of polycystic kidney and liver

신태영,김현숙,이중협,최종석,민현석,조형주,김경욱,강건,김정규,윤시은,박현규,황영욱,김효진,한미연,배은진,윤종우,나군호,이용성 대한비뇨의학회 2020 Investigative and Clinical Urology Vol.61 No.6

Purpose: Volumetry is used in polycystic kidney and liver diseases (PKLDs), including autosomal dominant polycystic kidney disease (ADPKD), to assess disease progression and drug efficiency. However, since no rapid and accurate method for volumetry has been developed, volumetry has not yet been established in clinical practice, hindering the development of therapies for PKLD. This study presents an artificial intelligence (AI)-based volumetry method for PKLD. Materials and Methods: The performance of AI was first evaluated in comparison with ground-truth (GT). We trained a V-net-based convolutional neural network on 175 ADPKD computed tomography (CT) segmentations, which served as the GT and were agreed upon by 3 experts using images from 214 patients analyzed with volumetry. The dice similarity coefficient (DSC), interobserver correlation coefficient (ICC), and Bland–Altman plots of 39 GT and AI segmentations in the validation set were compared. Next, the performance of AI on the segmentation of 50 random CT images was compared with that of 11 PKLD specialists based on the resulting DSC and ICC. Results: The DSC and ICC of the AI were 0.961 and 0.999729, respectively. The error rate was within 3% for approximately 95% of the CT scans (error<1%, 46.2%; 1%≤error<3%, 48.7%). Compared with the specialists, AI showed moderate performance. Furthermore, an outlier in our results confirmed that even PKLD specialists can make mistakes in volumetry. Conclusions: PKLD volumetry using AI was fast and accurate. AI performed comparably to human specialists, suggesting its use may be practical in clinical settings.