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이호균(Ho Gyun Lee),조광현(Kwang Hyun Cho),이유신(Yoo Shin Lee),김원석(Won Seok Kim),함의근(Eui Keun Ham),송계용(Kye Yong Song) 대한피부과학회 1990 대한피부과학회지 Vol.28 No.6
We reported a case of nevus sebaceus associated with trichilemmoma in a 19-year- old female patient. The lesion was a 2 x 2 cm sized yellowish verrucous plaque with two 0.3 x 0.3 cm sized dome-shaped papules. Histopathological examinat,ion revealed hyperkeratosis, papillomatosis and acanthosis, proliferation of sebaceus glands, presence of apocrine gland and mild inflammatory cellular infiltration around superficial vessels. In the epidermis of the lesion, there were two foci of lobulated mass consisted of clear cells with columnar basal cells and thick basement membrane. (Kor J Dermatol 28(6):818 821, 1990)
이호형(Ho Hyoung Lee),김종대(Jong Dae Kim),장은철(Eun Cheol Jang),손은식(Eun Sik Sohn),임희택(Hee Taek Lim),이춘보(Chun Bo Lee),신승권(Seung Kwan Shin) 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.9
Chorioangioma is the most common benign tumor of the placenta, which consists of a benign angioma arising from the primitive chorionic mesenchyme. The incidence is reported to be 1% in most large series where systemic section of placentas revealed small tumors. However, the incidence of large chorioangioma varies from 1 in 500 to 1 in 16,000 placentas examined.Most placental chorioangiomas have no clinical significance. However, the uncommon large tumors, particularly those greater than 5cm in diameter may be associated with maternal or fetal complications. For diagnosis of these lesions, the ultrasonography was used. If the chorioangioma is suspected, color doppler study is informative to confirm the presence of the vascular channels. We describe a recent case of chorioangioma and discuss the noxious effects of this benign tumor on the mother and the fetus.
이호종(Lee Ho-Jong),신명호(Shin Myoung-Ho) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
An electrical railway system uses high voltage system for train traction and low voltage system for train control. Railway systems are broadly distributed across mountains, sea sides and cities. Electrical accidents provoke the death and injury of a human being and the damage of the equipment by the overcurrent due to the catenary dropping and by the overvoltage due to lightning. Grounding systems are adopted for the protections of the system from the overcurrent and the overvoltage. Isolation grounding for each system can be easily installed. However, the closed circuits between grounding systems can be occurred. The currents flow through the closed circuits cause the abnormal operation of the system. To overcome the problem of the isolation grounding, the equipotential bonding is usually adopted. The equipotential bonding should have very small grounding resistance. In this paper, we showed the transition from the isolation grounding system to the common grounding system and presented the comparison and the analysis of two grounding systems by simulation. In addition, we proposed the direction for a new grounding system of electric railway.