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리들증후군으로 오인된 부신 선종에 의한 무증상 쿠싱증후군 1예
김규홍,김광현,유호열,남수민,이미영,고장현,신장열,정순희,정춘희 대한내분비학회 2006 Endocrinology and metabolism Vol.21 No.1
Subclinical Cushing's syndrome is defined as an autonomous cortisol hyperproduction without specific clinical signs of cortisol excess, but detectable biochemically as derangements of the hypothalamic -pituitary-adrenal axis function. We report a case of a 33-year-old woman with subclinical Cushing's syndrome caused by left adrenocortical adenoma, mistaken for Liddle's syndrome. The patient complained of fatigue. Laboratory findings showed metabolic alkalosis, hypokalemia, high TTKG (transtubular K concentration gradient), low plasma renin activity, and low serum aldosterone level, that findings implied as Liddle's syndrome. So we performed further study. Hormonal and radiologic studies revealed subclinical Cushing's syndrome with a left adrenal mass. The adrenal mass was resected and pathologically diagnosed as adrenocortical adenoma. After the resection of the left adrenal mass, patient's hormonal levels showed normal range (J Kor Soc Endocrinol 21:58~62, 2006). 저자들은 리들증후군의 양상을 보여 진행한 검사에서 내분비학적 검사, 방사선학적 및 병리학적으로 규명된 부신 선종에 의한 무증상 쿠싱증후군 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다.
Ni-doped and Reduced Ni-doped SrTiO_3 단결정의 전기전도도
김규홍,최재시,최찬유 연세대학교 자연과학연구소 1981 學術論文集 Vol.7 No.-
SrTiO_3: Ni와 "CO-reduced" SrTiO_3: Ni 단결정의 전기전도도를 700~1200℃ 및 10^-7~10^-1 atm 산소분압하에서 측정하였다. Log σ vs. 1/T의 도시에서 SrTiO_3: Ni dhk "CO-reduced SrTiO_3: Ni단결정에 대하여 σ∝ Po_2^-1/4와 σ∝ Po_2^-1/6을 각각 얻었으며 이론적으로 해석한 전기전도도의 산소분압의존성으로 부터 결함구조를 밝혀 전기전도도 메카니즘을 규명할 수 있었다. 전기전도도의 온도의존성으로부터 "CO-reduced" SrTiO_3: Ni의 polaron conduction이 제안되었다. The electrical conductivities of Ni-doped and "CO-reduced" Ni-doped SrTiO_3 single crystals were measured at temperatures from 700 to 1200℃ and oxygen partial pressures of 10^-7 to 10^-1 atm. Plots of log σ vs. 1/T at constant oxygen partial pressures were found to be linear, and the activation energies appeared to be 0.92 and 0.5 eV for Ni-doped SrTiO_3 and "CO-reduced" Ni-doped SrTiO_3 single crystals, respectively. The log σ vs. Po_2 at constant temperatures were found to be linear with an approximate slope of -1/4 for SrTiO_3: Ni and of -1/6 for "CO-reduced" SrTiO_3: Ni single crystals. The electrical conductivity dependences on Po_2 indicate that triply ionized titanium interstitial and an oxygen vacancy model are applicable to Ni-doped and "CO-reduced" Ni-doped SrTiO_3 single crystals. The polaron conduction was suggested on the "CO-reduced" Ni-doped SrTiO_3 from the temperature dependence of conductivity.
김규홍,김용록,김용배,이성한,최재시 연세대학교 자연과학연구소 1982 學術論文集 Vol.9 No.-
0.1, o.8 및 1.2mol% CdO-La_2O_3 계의 전기전도도를 500∼900℃ 및 10^-7∼10^-1atm의 산소분압하에서 측정하였다. 일정한 산소분압하에서 logσ vs. 1/T 도시는 직선관계를 보여 주었고 직선의 기울기에서 구한 활성화에너지는 0.96∼0.97eV이다. 500∼900℃ 영역에서 logσ vs. log Po_2 도시결과는 직선 관계를 나타내었으며 전기전도도의 산소분압 의존성은 σ∞Po_2^¼이다. CdO-La_2O_3계의 결함구조는 V_la^´´´과 Vo¨의 혼합형으로 사료되며, 전기전도도의 온도의존성과 산소분압의존성으로부터 혼합형의 결함구조 반응식을 규명하였다. CkO-La_2O_3계의 전기전도메카니즘을 결함구조 반응식으로부터 규명하였다. Electrical conductivity of CdO-La_2O_3 system containing 0.1, 0.8, and 1.2 mol% of CdO were measured from 500 to 900℃ at an oxygen partial pressures of 10^-7 to 10^-1 atm. Plots of log σ vs. 1/T at constant Po_2 are found to be linear and the activation energy appears to be 0.96-0.97eV. The log σ vs. log Po_2 are found to be linear at oxygen pressures (Po_2's) of 10^-7 to 10^-1 atm and at 500∼900℃. The conductivity dependence on Po_2 at the above temperature range is given by σ∞Po_2^¼. The defect structure in this system are believed to be complex, i.e., V_la^´´´ and Vo¨. The interpretations of conductivity dependence on temperature and Po_2 are presented and conduction mechanism is proposed to explain the data.
金奎弘 연세대학교 대학원 1978 延世論叢 Vol.15 No.-
The electrical conductivity measurements have been made on polycrystalline samples of various compositions in the MgO-TiO ₂system from 600 to 1100℃ under Po₂'s of 10^-1 to 10^-8 atm. Plots of log σ vs. 1/T at constant Po_2 are found to be linear with intersection, and the activation energies are 1.94 eV for the intrinsic range and 0.48 eV for the extrinsic range, respectively. The log σvs. log Po₂ curves are found to be linear at constant temperature, and the conductivity dependences of Po₂ are closely approximated by σαPo_2^-1/6 for the extrinsic and σαPo_2^-1/4 for the intrinsic range, respectively. The dominant defects in this system are believed to be oxygen vacancy for the extrinsic and Ti^3+ interstitial for the intrinsic range. The conduction mechanisms in both the extrinsic and the intrinsic range are proposed by the results of the electrical conductivity dependence on the electrical conductivity dependence on the oxygen partial pressure.
자발성 뇌지주막하 출혈후 임상적 뇌혈관 연축에 관련된 요인들ㄹ에 대한 연구
김규홍,허재택 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.11
Authors analysed a series of 175 pastients with aneurysmal subarachnoid hemorrhage(SAH) who have undergone the treatment for subarachnoid hemorrhage from July, 1990 to May, 1994 to assess the clinical factors related to clinical vasospasm. This investigation revealed following conclusions. 1) The severity of subarachnoid hemorrhage as seen on computed tomography seemed to be correlated with the appearance of clinical vasospasm. Patients with severe SAH on initial CT scan were at higher risk of clinical vasospasm. 2) Patients with history of hypertension had more significant clinical vasospasm than did normotensive patients after aneurysmal SAH. 3) Aneurysms of the anterior communicating artery were showen to have the highest incidence of clinical vasospasm. 4) Patients with moderate to severe diffuse vasospasm on cerebral angiography had more significant clinical vasospasm than patients with no or local vasospasm. These conclusions suggest that clinical vasospasm after aneurysmal SAH are related to the following predictable factors ; amount of blood on the initial CT scan ; angiographic vasospasm ; history of hypertension and location of aneurysm. Proper management of these factors may diminish the incidence and severity of clinical vasospasm and reduce the morbidity and mortality rate.