http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
정지원,박준우,공현희,정동일,곽미선,조영욱.Ji Won Jeong. M.D.. Joon Woo Park. M.D.. Hyun Hee Kong. M.D.. Dong Il Chung. M.D.. Mi Seon Kwak. M.D.. Young Wook Cho. M.D. 대한안과학회 2006 대한안과학회지 Vol.47 No.9
Purpose: We report a case of intraocular Thelazia callipaeda infestation in a patient with panuveitis who had a successful recovery after pars plana vitrectomy. Methods: A 73-year-old female patients complained of a floating sensation and gradually decreasing visual acuity in her right eye. On slit lamp examination, severe intraocular inflammatory reaction was observed. Fundus examination revealed severe vitreous haze with mobile linear structure. Three-port pars plana vitrectomy was performed and then the worm was removed. Results: The worm was confirmed to be Thelazia callipaeda. At postoperative 2 months, the patient’s visual acuity was 0.6 and intraocular pressure 14 mmHg. There was no evidence of intraocular inflammatory reaction. Conclusions: Thelazia callipaeda usually lie in the conjunctival sac or lacrimal apparatus, causing ocular surface disease, but intraocular infestation rarely occurs. If intraocular infestation does occur, early surgical removal should be performed.