• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.11
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• pp.1929-1935
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• 2010

This paper describes the operation effect of FACTS devices in the Korean power system. At the year of 2010, three FACTS devices is under commercial operation in the Seoul area. Among them, 345kV ${\pm}100MVA$ STATCOM at Mi-Geum substation and 345kV ${\pm}200MVA$ SVC at Dong-Seoul substation are very close at their electrical and geographical distance. Therefore, the additional analysis including interaction and mutual transient is necessary. Therefore, a detailed EMTDC/PSCAD simulation model was developed and steady-state/transient analysis was implemented.

• Proceedings of the KIEE Conference
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• summer
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• pp.926-928
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• 2004

For the permanent magnet synchronous motor(PMSM) drive to operate above the base speed in the constant horsepower region, field weakening control is applied. But field weakening control was not almost applied to sensorless control of the permanent magnet synchronous motor. In this paper, field weakening control is applied to the sensorless control of PMSM based on an instantaneos reactive power. And the effectiveness of the proposed system is verified by the experimental results.

• Proceedings of the Korea Contents Association Conference
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• 2018.05a
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• pp.123-124
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• 2018

본 연구는 건설 구조물의 재난방재를 위하여 사전에 시설물의 상태를 공간정보기반에서 확인하고 보다 구체체적인 상태를 계측하기 위하여 인공위성과 유비쿼터스 및 사물인터넷 및 무인항공기 등의 신기술을 적용하여 공간적으로 참조 가능한 모든 형태의 측위정보를 효과적으로 수집, 저장, 갱신, 조정, 분석, 표현할 수 있도록 하기 위한 것이다. 건설 구조물의 주요부분에 대한 미세한 측위와 분석을 하였고, 미세변위에 영향을 주는 환경인자를 USN/IoT 도구로 측정하여 그 상태를 확인하도록 하였다. 이를 통하여 건설구조물의 설계 및 시공 도면과 정밀한 공간정보를 유기적으로 결합할 수 있도록 하여 반영구적인 주요 시설물의 정밀한 미세변위의 변형을 추적하여 방재관리에 효율적으로 대처할 수 있는 적용기법을 제시하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.175-177
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• 2004

In this paper, we provide a mechanism to map topics between similar Topic Map ontologies, which enlarge the capacities of current Topic Maps. That is, there is no explicit way to map topics across multiple Topic Maps in current technology. Therefore, our approach provide semi-automatic or automatic mapping of topics between Topic Maps. In order to map the topics, we provide precise definitions of mapping properties and mapping rules.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.142-143
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• 2012

EBOP(Electrical Balance of Plant)는 연료전지 출력인 DC 전원을 전력변환기술을 이용하여 계통 전원에 연계하는 계통 연계형 PCU 시스템이다. EBOP는 연료전지의 DC 전압 특성을 고려하여 인버터를 설계하여야 안정적인 전력 제어가 가능하다.

• Journal of Preventive Medicine and Public Health
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• v.16 no.1
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• pp.157-162
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• 1983

In order to determine the factors affecting the length of stay by pay status, a total of 961 in-patients medical records with appendectomy. cholecystectomy and Cesarean section discharged from the January 1979 to December 1981 from the University hospital were reviewed. Average length of stay showed no statistically significant difference by year between the insured and the non-insured patients, however multiple diagnoses and surgical complication were significantly different from single diagnosis and non-complicated cases. Surgical complication explained the length of stay mostly, and physician in discharge, multiple diagnoses, and accommodation in order for insured patients. Surgical complication, admission route, physician in charge and age in order explained the length of stay for non-insured patients.

• Korean Journal of Head & Neck Oncology
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• v.24 no.1
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• pp.80-82
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• 2008

Epidermoid cysts can be found anywhere in the body, particularly in areas where embryonic elements fuse together. Most cases have been reported in the ovaries, the testicles, as well as the hand and feet. Epidermoid cysts in mouth are uncommon and account for less than 0.01% of all oral cysts. The treatment of choice is complete surgical excision and prognosis is excellent. The purpose of this article is to describe two cases of an epidermoid cyst in the oral cavity mucosa and a review of the literature.

• Journal of Korean Neurosurgical Society
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• v.39 no.4
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• pp.296-299
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• 2006

A 35-year-old woman, previously treated for systemic metastases from retroperitoneal yolk sac tumor, presented with progressive painful paraparesis. Preoperative images showed severe cord compression by the metastatic infiltration of the lumbar vertebrae and epidural mass as well as a huge retroperitoneal mass. While performing unremarkable surgery in prone position, the patient abruptly fell into hypoxic insults and circulatory arrest. Intraoperative pulmonary tumor embolism was deemed a cause of death. When planning operative procedure for this dangerous malignancy, scrupulous manipulation is mandated and the possibility of fatal pulmonary tumor embolism should also be addressed and fully discussed preoperatively.

• Journal of Korean Neurosurgical Society
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• v.39 no.6
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• pp.443-446
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• 2006

Intracranial arachnoid cyst is presumed to be a developmental anomaly and its natural history is not well defined. Often it is detected incidentally in a asymptomatic patient and hemorrhagic events of arachnoid cyst following head injury are rarely reported. We report hemorrhagic complications including two intracystic hemorrhages, two subdural hematomas, and an epidural hematoma in 5 patients with intracranial arachnoid cyst after minor head injury and review pertinent literatures.

• Journal of Korean Neurosurgical Society
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• v.29 no.3
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• pp.420-425
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• 2000

Epidural steroid injection(ESI) has been a commonly applied conservative therapy for the management of chronic low back pain and sciatica. However, there are many reports concerning various local, systemic and neurological complications related to ESI. We report two cases with fatal complications after ESI for low back pain and sciatica. In both patients, ventriculitis and meningitis were causative factors to be fatal. Aseptic procedures and careful post-procedure assessment are essential to avoid serious complications following ESI.