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Electrical Conductivity of the Solid Solutions X $ZrO_2+ (1-X) Yb_2O_3; 0.01{\leq}X{\leq}0.09$
Choi Byoung Ki,Jang Joon Ho,Kim, Seong Han,Kim, Hong Seok,Park, Jong Sik,Kim Yoo Young,Kim, Don,Lee Sung Han,Yo Chul Hyun,Kim Keu Hong Korean Chemical Society 1992 Bulletin of the Korean Chemical Society Vol.13 No.3
$ZrO_2-dopedYb_2O_3solid$ solutions containing 1, 3, 5, 7 and 9 mol% $ZrO_2were$ synthesized from spectroscopically pure $Yb_2O_3$ and $ZrO_2$ powders and found to be rare earth C-type structure by XRD technique. Electrical conductivities were measured as a function of temperatures from 700 to $1050^{\circ}C$ and oxygen partial pressures from 1${\times}$$10^-5$ to 2${\times}$ $10^-1$atm. The electrical conductivities depend simply on temperature and the activation energies are determined to be 1.56-1.68 $_eV$. The oxygen partial pressure dependence of the electrical conductivity shows that the conductivity increases with increasing oxygen partial pressure, indicating p-type semiconductor. The $PO_2$ dependence of the system is nearly power of 1/4. It is suggested from the linearity of the temperature dependence of electrical conductivity and only one value of 1/n that the solid solutions of the system have single conduction mechanism. From these results, it is concluded that the main defects of the system are negatively doubly charged oxygen interstitial in low. $ZrO_2doping$ level and negatively triply charged cation vacancy in high doping level and the electrical conduction is due to the electronic hole formed by the defect structure.
김규한,박경찬,방형돈,김병국,황지훈 대한피부과학회 1996 Annals of Dermatology Vol.8 No.1
We report a case of malignant histiocytosis which began with intermittent fever and scaly skin lesions. A 3-year-old girl presented with erythematous scaly papules on the face and the trunk, and high fever for 3 months. The cutaneous lesions consisted of widespread coin-sized erythematous scaly papules with marginal brownish pigmentation. She was anemic and thrombocytopenic and had impairment of the liver function. Histopathologic study of the skin lesions showed non-specific findings except for hyperkeratosis. However, bone marrow examination revealed an increased number of histiocytes, mostly immature with active phagocytosis of erythroid cells, myeloid cells, and platelets. She was diagnosed as having malignant histiocytosis .and treated with cyclophosphamide and vincristine. She died the next day after the treatment had begun.
김규한,박경찬,방형돈,김병국,황지훈 대한피부과학회 1996 Annals of Dermatology Vol.8 No.1
We report a case of chronic myelogenous leukemia in a 2-year-old boy which was manifested as recurrent erythema nodosum-like lesions during his illness. He presented. with recurrent erythema nodosum-like lesions involving both legs, and some lesions were followed by cellulitis-like swelling. He had 3 episodes of leg swelling accompanied by high fever, and the erythema nodosum- and cellulitis-like lesions subsided with antibiotic therapies, but recurred. After his transfer to the pediatric department, he was initially diagnosed as having tuberculosis and was treated with anti-tuberculosis medication. However, subsequent peripheral blood examination showed an increase of immature granulocytic cells and monocytes, and bone marrow aspiration revealed increased myeloid blasts.
스테로이드 복용력이 없는 성인 여자에서 발생한 거대 간세포선종 1 예
김인철,한상원,김명훈,김병기,김동구,김부성,박두호,이창돈,김성수,윤승규,김선무,한혁준 대한내과학회 1996 대한내과학회지 Vol.51 No.5
Hepatocellular adenoma is a benign epithelial tumor of liver, occurring in non-cirrhotic liver, especially in women. And the most of them are associated with oral contraceptives. We experienced a case of hepatocellular adenoma in a 38 years old woman without a history of taking contraceptive steroid, and the mass was about 15㎝ in diameter. Hepatocellular adenoma containing suspicious cancerous lesion was confirmed by operation and histologic examination.