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유리체절제술을 시행 또는 예측되는 당뇨망막병증 환자에서 하비측 섬유주절제술의 결과
정지원,조영욱,Ji Won Jeong,M,D,Young Wook Cho,M,D 대한안과학회 2006 대한안과학회지 Vol.47 No.10
Purposes: We evaluated the outcome of trabeculectomy using inferonasal bleb in diabetic retinopathy patients awaiting vitrectomy or on whom vitrectomy was performed. Methods: We retrospectively reviewed the medical records of patients who had undergone trabeculectomy with an inferonasal bleb from December 2002 to May 2005. Seven eyes had neovascular glaucoma secondary to the proliferative diabetic retinopathy, 6 eyes primary open angle glaucoma, and 4 eyes steroid induced glaucoma. We evaluated postoperative complication, intraocular pressure, the number of ocular hypotensive eye drops, and preoperative and postoperative best corrected visual acuity. Results: Mean follow-up period was 20.47±5.55 months. Most common complication was early ocular hypotony (4 eyes, 24%), but no blebitis and bleb associated endophthalmitis were observed. Mean intraocular pressure was reduced from 30.77±5.61 mm Hg preoperatively to 13.72±4.61 mm Hg at the most recent follow-up. The number of preoperative ocular hypotensive eye drops was 2.9±0.3 and that of postoperative eye dros was 1.4±1.0. The difference between these was statistically significant (p=0.000). Eleven eyes (61.11%) had a stable or improved visual acuity. Conclusions: Trabeculectomy using an inferonasal bleb appears to be a safe and effective surgical option that may be helpful in certain clinical situations, such as medically uncontrolled glaucomatous eyes with expected vitrectomy or vitrectomized eyes.
확장된 상악전치부 결손부위에 골이식을 동반한 임플란트 심미수복 증례
정지원,박상용,김윤영,박원희,이영수,Jeong, Ji-Won,Park, Sang-Yong,Kim, Yoon-Young,Park, Won-Hee,Lee, Young-Soo 대한치과보철학회 2016 대한치과보철학회지 Vol.54 No.3
The maxillary anteriors play an important role in esthetics. Therefore after extraction, it is crucial to preserve the hard tissue and soft tissue in order to promote esthetics of restoration. There are several challenges when restoring the maxillary anteriors via implant. Some of the challenges are be maintaining consistency with neighboring teeth in terms of shade, form, and texture : as well as having harmonious emergency with the gingival margin. In this case, a traumatized patient with crown-root fracture of the maxillary central and lateral incisors is presented. The cracked teeth were extracted, and implants were inserted with bone grafts to compensate the volume of damaged area of the maxillary anterior. Cantilever implant prosthetics were planned while precise adjustments to the gingival area were made using customized impression coping to perform the esthetic restorations. The final outcome of the treatment was satisfying in both esthetic and utilitarian perspective. 상악 전치부는 심미적으로 중요한 역할을 하는 치아이다. 그러므로 발치 후 심미적인 보철 수복을 위하여 경조직 및 연조직의 보존이 중요하다. 상악 전치부 상실을 임플란트를 이용하여 수복하는 경우 몇 가지 난관에 부딪히게 된다. 즉 수복물과 인접치와의 색상 및 형태, 인공치 표면의 조화 및 치은연과의 조화로운 연속성 등이다. 본 증례는 외상으로 인하여 상악 중절치와 측절치의 치관-치근 파절을 주소로 내원하였다. 예후가 불량한 파절 치아를 모두 발치 하였으며 상악 전치부 결손부위에 골이식을 동반한 임플란트를 식립하였다. 보다 나은 심미적 결과를 위하여 캔틸레버 임플란트 보철물을 계획하였고 인공치아 연하의 치조점막을 지속적으로 조정하였고 그것을 정확하게 인기해내는 맞춤형 인상코핑을 이용하여 임플란트 심미 보철 수복을 시행하였다. 최종치료 후 심미적, 기능적으로 만족스러운 결과를 얻었기에 이를 보고하고자 한다.
DVB-S2 기반 LDPC 복호기의 멀티레벨 변조 방식 적용을 위한 디맵핑 알고리즘
정지원,정진희,김민혁,Jung Ji-Won,Jeong Jin-Hee,Kim Min-Hyuk 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.7
DVB-S2 표준안에서는 다양한 부호화율과 그에 따른 다양한 변조 방식을 지원한다. 따라서 본 논문에서는 LDPC에 8 PSK 이상의 다치 변조 방식 적용을 위해 수신단에서 비트 분리 방법을 제시한다. 수신된 I, Q 심볼만을 이용하여 세 비트 이상의 비트를 분리하기 위한 LLR 방식에 기초를 하여 LLR 방식의 단점인 복잡도를 개선하기 위해 Euclidean, MAX, Sector 방식을 제시하였다. DVB-S2 offers various coding rate and modulation schemes. Therefore this paper proposes bit split methods to applying to multilevel modulation. Log-likelihood ratio method splits multilevel symbols to soft decision symbols using the received in-phase and quadrature component based on Gaussian approximation. However it is too complicate to calculate and to implement hardware due to exponential and logarithm calculation. Therefore this paper presents Euclidean, MAX and Sector method to reduce the high complexity of LLR method.
고성능 유연 투명전극용 SiO<sub>2</sub> 기반 비대칭 다층 박막의 특성
정지원,공헌,이현용,Jeong, Ji-Won,Kong, Heon,Lee, Hyun-Yong 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.1
Oxide (SiO<sub>2</sub>)/Metal(Ag)/Oxide(SiO<sub>2</sub>, ITO, ZnO) multilayer films were fabricated using a magnetron sputtering technique at room temperature on Si (p-type, 100) and a glass substrate. The electrical and optical properties of the asymmetric multilayer films depended on the thickness of the mid-layer film and the type of oxide in the bottom layer. As the metal layer becomes thicker, the sheet resistance decreases. However, the transmittance decreases when the metal layer exceeds a threshold thickness of approximately 10~12 nm. In addition, the sheet resistance and transmittance change according to the type of oxide in the bottom layer. If the oxide has a large resistivity, the overall sheet resistance increases. In addition, the anti-reflection effect changes according to the refractive index of the oxide material. The optical and electrical properties of multilayer films were investigated using an ultraviolet visible (UV-Vis) spectrophotometer and a 4-point probe, respectively. The optimum structure is SiO<sub>2</sub> (30 nm)/Ag (10 nm)/ZnO (30 nm) multilayer, with the highest FOM value of 7.7×10<sup>-3</sup> Ω<sup>-1</sup>.
CPS환경에서 산불 정찰을 위한 무인기 비행경로 생성 도구
정지원,배창희,최으뜸,이성진,Ji-Won Jeong,Chang-Hui Bae,EuTeum Choi,SeongJin Lee 대한임베디드공학회 2023 대한임베디드공학회논문지 Vol.18 No.6
Existing studies on the UAV (Unmanned Aerial Vehicle)-based CPS (Cyber Physical System) environment lack forest fire monitoring and forest fire reconnaissance using real-world UAVs. So, it is necessary to monitor forest fires early through CPS based on real-world UAVs with high reliability and resource management efficiency. In this paper presents an MFG (Misstion File Generater) that automatically generates a flight path of an UAV for forest fire monitoring in a CPS environment. MFG generates flight paths based on a hiking trail with a high fire probability due to a true story of an entrant. We have confirmed that the flight path generated by MFG can be applied to the UAV. Also, we have verified that the UAV flies according to the flight path generated by MFG in simulation, with a negligible error rate.