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Potassium-Titanyl-Phosphate 레이저를 이용하여 제거한 기관 육아종 1예
홍지송,이길준,Hong, Ji Song,Lee, GilJoon 대한후두음성언어의학회 2020 대한후두음성언어의학회지 Vol.31 No.2
Tracheal granuloma, the most commonly reported sequela of pediatric tracheotomy. A variety of techniques are available for the management of tracheal granuloma. Potassium-titanyl-phosphate (KTP) laser has been previously established as an acceptable technique for removal of laryngeal surgery, which emits a green light with a wave length of 532 nm, which is well-absorbed by hemoglobin and can coagulate and vaporize tissue. The ability to deliver laser energy through a flexible glass fiber makes the technique convenient for use with a rigid bronchoscope, overcoming problems with intraluminal access encountered with earlier attempts at CO2 laser therapy for this problem. Another advantage of KTP laser is the avoidance of the risks and morbidity associated with an open procedure. We report our surgical technique KTP laser in the management of tracheal granuloma removal into the tracheostomy site. KTP laser is good tool for management of tracheal granuloma with low incidence of complications.
LVDC 배전계통 한류형 컨버터를 이용한 Zone 보호협조 방안 개발
홍지송(Ji-Song Hong),김진수(Jin-Soo Kim),김혜은(Hye-Eun Kim),최희원(Hee-Won Choi),윤상윤(Sang-Yun Yun) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
본 논문에서는 한류형 전력변환장치 및 일반적인 DC 차단기를 이용한 LVDC 배전계통의 보호협조 방안을 제시하였다. 이를 위해 LVDC 배전계통을 그 구성 토폴로지에 의한 전형적인 보호영역으로 구분하였으며 이러한 보호영역 별 보호협조 방안을 제시하였다. 각 보호영역의 고장에 대한 보호협조 검토를 통해 각 보호기기의 역할을 구분하였으며 그 역할별로 순시 및 한시 동작 기준치를 설정하였다. 많은 LVDC 연구들이 사용하는 기기간 통신신호 전달 없이 개별 보호기기에 대한 역할구분 및 정정치 설정만으로 신뢰성있는 보호협조가 가능하도록 하였다. LVDC 시험 배전계통에 대해 Matlab Simulink를 이용한 사례연구를 통해 제안한 방식이 효과적임을 입증하였다.
마이크로그리드의 비상상황시 자율 대처 운전 방안에 관한 실증적 연구
홍지송(Ji-Song Hong),김현우(Hyun-Woo Kim),안선주(Seon-Ju Ahn),최준호(Joon-Ho Choi),윤상윤(Sang-Yun Yun) 대한전기학회 2018 전기학회논문지 Vol.67 No.12
The biggest obstacle to the commercialization of small and medium size microgrid (MG) is the reliability and economics of MG operation and maintenance. In this paper, we propose an autonomous operation method that is implemented as an application program installed in the MG operating system in emergency situations. The proposed algorithm consists of four steps of distinction, recognition, determination and control of emergency situations that can occur in MG. A fuzzy-based situation decision algorithm has been proposed to eliminate the barriers of autonomous operation in actual emergency situation such as occurrence of bad data and communication delay. In addition, countermeasures have been suggested for cases where multiple emergency situations have occurred in combination. The proposed algorithm was tested in a 500㎾ actual microgrid site of a university. Through the test, the validity of the proposed method and its applicability to practical MG operation are verified.
윤상윤(Sang-Yun Yun),홍지송(Ji-Song Hong) 대한전기학회 2020 전기의 세계 Vol.69 No.6
최근 배전계통의 계통 감시 및 실시간 운영의 정확도를 향상시키기 위해 PMU(Phasor measurment unit)의 필요성이 대두되고 있다. 본 고에서는 PMU의 정의 및 기본 원리와 배전계통에서의 그 활용 방안을 요약하였다. 또한, PMU와 같은 고정밀 단말장치 기반의 운영을 위한 고려사항들에 대해 언급하였다. To improve the accuracy of distribution system monitoring and realtime operation, the necessity for a PMU (phasor measurement unit) is emphasizing. In this article, we describe the definition and basic principle of a PMU and its technical applications in the distribution networks. Also, we discussed for the considerations of the operation using high-precision devices such as the PMU.
배전계통에서의 PV 인버터 제어 특성을 고려한 고장해석 방법
심기도(Gi-Do Sim),안선주(Seon-Ju Ahn),최준호(Joon-Ho Choi),홍지송(Ji-Song Hong),윤상윤(Sang-Yun Yun) 대한전기학회 2019 전기학회논문지 Vol.68 No.12
Photovoltaic(PV) generations in power distribution networks are dramatically increasing. As PV increases, there is a needs to consider the contribution of fault current. PV is connected to the grid through an inverter, and the control method has different current contributions from conventional generators. In this paper, we propose a fault analysis method considering the control characteristics of PV inverter for power distribution networks. The current and power of PV during a fault are determined by the terminal voltage and control methods of the inverter. To reflect the inverter control characteristics, 3 phase unbalanced power flow is used for the fault analysis. For this, we present the 3 phase models of distribution networks, such as line, transformer and PV. Admittance and impedance matrix representations were performed for the models. We use Implicit Zbus Method for the 3 phase unbalanced power flow. In the case studies for an example network, we compare the results between the proposed methods and MATLAB simulation. Through the case studies, we verify the accuracy of the proposed fault analysis method.