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이경율 ( Lee Gyeong Yul ),신수 ( Sin Su ),정경호 ( Jeong Gyeong Ho ),윤태호 ( Yun Tae Ho ),강신영 ( Kang Sin Yeong ) 한국고무학회 2003 엘라스토머 및 콤포지트 Vol.38 No.3
본 연구에서는 분자량이 다른 순수 천연고무 용융체와 다양한 유형의 카본블랙을 혼합한 배합고무 융용체의 탄성반응을 조사하였다. 또한 카본블랙과 고무 분자와의 상호작용과 이들 탄성반응이 갖는 상관성을 규명키 위해 입자의 크기와 구조가 다른 카본블랙을 대상으로 결합 고무를 측정하였다. 카본블랙의 함량이 증가할수록 결합고무는 증가하였고 특히 카본블랙 입자의 크기가 작아 비표면적이 넓고 구조가 발달될수록 증가하였다. 카본블랙을 혼합한 배합고무 용융체의 탄성반응은 순수고무의 경우에 비해 크게 향상되었으며 특히 결합고무가 큰 경우에 보다 현저하였다. 순수고무 용융체의 분자량이 증가할수록, 그리고 고무에 혼합된 카본블랙 입자의 크기가 작을수록 응력이완 거동은 지연되었으며 복원거동은 보다 탄성적으로 변하였다. 영구변형 거동에 있어서는 고무 분자량이 감소하고 카본블랙 입자 크기가 증가할수록 그 변형정도가 커졌다. Elastic responses on both pure natural rubber melts with different molecular weights and the rubber compounds mixed with various types of carbon blacks were investigated in this study. Furthermore, the degree of bound rubber was measured for various carbon blacks with different sizes and structures in order to study the interaction between the rubber and carbon blacks, and to study the correlation between the interaction and the elastic responses. As a loading amount of carbon black increased, the degree of bound rubber became higher, particularly for carbon-black particles with smaller sizes and higher structures. The elastic responses of the rubber melt filled with carbon black remarkably improved, as compared with those of unfilled rubber melt, specially in carbon black showing higher contents of bound rubber. Stress relaxation was more delayed and recovery behavior became more elastic, as the molecular weight of the rubber melt increased and the size of carbon-black particles was decreased. Permanent set became higher, as the molecular weight of the rubber melts decreased and the size of carbon-black particles increased.
A Case of Erdheim-Chester Disease with Asymptomatic Renal Involvement
이현정,이경율,신동엽,이윤규,최세연,문경철,한일규,김태민 대한암학회 2012 Cancer Research and Treatment Vol.44 No.2
Erdheim-Chester disease is a rare non-Langerhans-cell histiocytosis involving bones and multiple organs. Its clinical course can vary, from an asymptomatic state to a fatal disease, with renal involvement being a common cause of death. A 41-year-old man presented with a 10-month history of bilateral lower limb pain. Left perirenal soft-tissue infiltration had been found incidentally two years earlier. No progression of the lesion or deterioration of renal function was observed for a period of two years. At admission, plain radiography and magnetic resonance imaging of the patient’s lower limbs showed patchy osteosclerosis. Biopsy of the tibia revealed histiocytic infiltration,which was found to be positive for CD68 and negative for CD1a. This report describes an unusual case of Erdheim-Chester disease involving a stationary course of disease with no specific treatment for a long period of time.
Primary Cavernous Hemangioma of the Thyroid Gland
김신우,이경율,진영주,유윤종 대한갑상선학회 2023 International Journal of Thyroidology Vol.16 No.2
Hemangiomas are benign vascular tumors that result from the abnormal proliferation of vascular tissue. Thyroid hemangiomas can develop as a result of procedures such as fine needle aspiration or other secondary trauma. Primary thyroid cavernous hemangioma is an extremely rare condition, with only a few reported cases. In this report, we present the case of an 83-year-old woman who complained of progressively worsening symptoms of right neck obstruction. She was undergoing levothyroxine treatment for hypothyroidism, and there was no specific family history of thyroid issues. The patient presented with a goiter and obstructive symptoms, and denied any history of trauma or invasive procedures. Thyroid sonography revealed a 6.21 cm heterogeneous dominant solid nodule in the right lobe. Additionally, a large mixed cystic and 6 cm solid mass was identified in the right lobe on CT scan. Due to the significant size of the mass and the presence of obstructive symptoms, the patient underwent a right thyroid lobectomy without further evaluations. Histologic examination of the specimen revealed a cavernous thyroid hemangioma. This case report presents our experience in diagnosing cavernous thyroid hemangioma.