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정의환(Eui-Hwan Jung),허준(Jun Heo),윤재훈(Jae-Hun Yoon),임기조(Kee-Joe Lim),이홍규(Hyung-Kyu Lee) 대한전기학회 2009 전기학회논문지 Vol.58 No.11
In this paper, each specimen blended at weight proportions of 80% HDPE to 20% EVA, 70% HDPE to 30% EVA, 60% HDPE to 40% EVA, and 50% HDPE to 50% EVA was manufactured respectively. The insulation performances of the proposed insulator were compared with conventional XLPE, main insulating material of CV cable on the basis of the investigation results of DC insulation performances. From the space charge density, electric field and potential profiles with raising DC voltage and time variation in HE82, distortion of electric field distribution was improved. As EVA mixed into the bulks acts as nucleation in crystallization process of HDPE, the size of spherulites became decreased and finally formed continuous network structure. Ultimately, it resulted from extinction of space charge in the interfacial region of spherulites.
원발성 부갑상선 기능항진증의 종양 위치 선정을 위한 진단 검사법의 유용성 비교
이석인,이명철,조보연,이홍규,고창순,민헌기,박용수,이명식,오승근,김성연,박재형 대한내분비학회 1992 Endocrinology and metabolism Vol.7 No.1
To compare the preoperative localization procedures, a total of 30 parathyroid tumors were scanned preoperatively using 99Tc-201Tl subtraction scan, high-resolution ultrasonography and computerized tomography (CT). Twenty-three cases of radionuclide scintigraphy, 20 cases of ultrasonography and 29 cases of CT have been taken in 22 cases of parathyroid adenoma, 3 cases of parathyroid hyperplasia and a case of parathyroid cancer. 1) The sensitivities of parathyroid scintigraphy, sonography and CT in detecting parathyroid tumors were 869p, 609p and 7496, while the specificities of respective diagnostic modality were 92Zo, 92F and 9896. 2) Preoperative localization of parathyroid tumors appeared related not only to the volume of the tumor, but also to the position of the tumor. Ultrasonagraphy and CT were not as sensitive as parathyroid scintigraphy in detecting the tumor located in the left lower lobe of parathyroid gland. 3) Common errors in localizing the tumors were easily made in cases with the volume of tumor less than 1 cm', with the tumor surrounded by the normal architecture or the false tumor mimicking parathyroid gland, and with the abnormal thyroid gland nearby, Neck CT was a specific method for the preoperative localization especially in case of the tumors involving more than 2 parathyroid glands. 99Tc-201Tl parathyroid scintigraphy was useful for the localization of parathyroid adenomas and hyperplastic glands and the sensitivity of it exceeded that of either ultrasonography or CT. It will be necessary to evaluate the applicability of the preoperative localization modalities extensively in case of, at least, hyperparathyroidism of the primary or persistent types. (J Kor Soc Endocrino 17:52-60, 1992)