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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.
안병준 ( Byoung Jun Ahn ),한규성 ( Gyu Seoung Han ),최돈하 ( Don Ha Choi ),조성택 ( Sung Taig Cho ),이수민 ( Soo Min Lee ) 한국목재공학회 2014 목재공학 Vol.42 No.3
In this study, the potential of biomass, which is generated from oil palm cultivation and crude palm oil (CPO) production of Indonesia was assessed in the aspect of energy content. The types of oil palm biomass were classified on the basis of the cultivation stage and the CPO production stage. In the cultivation stage, biomass is considered to be produced from its` root, trunk and frond. Other possible biomass resources such as empty fruit bunch (EFB), palm kernel shell (PKS) and fiber were included in the CPO production stage. As results, total biomass from damaged plantation area of Indonesia was estimated to be annually from 3 million to 16 million tons in 2011. From CPO mills, approximately49 million tons/yr of biomass residues were estimated to be annually occurred. Their total energy content from each biomass source in cultivation stage was analyzed to be from 593,000 to 3,197,000 TOEs in terms of gross calorific value. In the case of CPO mills, around 22.7 million TOEs was estimated to be potential energy producible by biomass based on gross calorific value of dry basis. If moisture content considered, net calorific value was analyzed to be decreased to 16.3 million TOEs. Based on the results, the total energy contents of all oil palm biomass were estimated to be up to 25,919,000 TOE in terms of gross calorific value.
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.
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.
스테로이드 복용력이 없는 성인 여자에서 발생한 거대 간세포선종 1 예
한혁준(Hyeok Jun Han),윤승규(Seung Kew Yoon),김명훈(Myung Hoon Kim),김성수(Sung Soo Kim),한상원(Sang Won Han),이창돈(Chang Don Lee),박두호(Doo Ho Park),김부성(Boo Sung Kim),김병기(Byoung Kee Kim),김선무(Sun Moo Kim),김동구(Dong Goo K 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.