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Clinicopathological role of kidney injury molecule-1 in immunoglobulin A nephropathy
( Yu Ho Lee ),( Yang-gyun Kim ),( Sang-ho Lee ),( Ju-young Moon ),( Kyung-hwan Jeong ),( Tae-won Lee ),( Chun-gyoo Ihm ) 대한신장학회 2014 Kidney Research and Clinical Practice Vol.33 No.3
Background: Urinary kidney injury molecule-1 (KIM-1) is an early and sensitivebiomarker of acute kidney injury, but it is unclear if it is a biomarker of chronicglomerulonephritis. We evaluated whether urinary KIM-1 levels in patients withimmunoglobulin A (IgA) nephropathy can be a marker to reflect clinicopathologicalseverity and predict the prognosis. Methods: We measured urinary KIM-1 levels in 40 patients (15 males; mean age36.6712.9 years) with IgA nephropathy and 10 healthy people (5 males; mean age37.379.6 years) as controls. The correlation of urinary KIM-1 levels with patients’clinical parameters, histological grades, and follow-up data were analyzed using themodified H. S. Lee grading system and tubulointerstitial change scores. Results: Urinary KIM-1 levels were higher in patients with IgA nephropathy thanhealthy controls (P¼0.001). Univariate and multivariate regression analyses showedthat urinary KIM-1 levels had a direct correlation with H. S. Lee grade andtubulointerstitial inflammation (P¼0.004 and P¼0.011, respectively). Conclusion: In patients with IgA nephropathy, urinary KIM-1 has a significantcorrelation with histopathologic severity.
김영범,박종아,김진해,김권태,김정규,마대영,박기철 경상대학교 생산기술연구소 2001 工學硏究院論文集 Vol.1 No.-
The microsensors to detect NH3 gas were fabricated by continous deposition of In film by evaporation and ZnO film by rf magnetron sputtering onto the Si3N4 diaphragm that was prepared by MEMS technology. The sensors were heat-treated to dope In into the ZnO thin film. The electrical characteristics of sensitive films were studied as a function of heat-temperature by 4-point probing method and electrometer. The dependence of the sensitivity, selectivity and time response of sensor on heat-treatment temperature was investigated. The microsensor heat-treated at 400℃ that 3000 A ZnO:In film was chosen as gas sensitive film, showed the highest sensitivity 23% at 350ppm NH3 under 366mW heater power. The time response was 90sec. The sensitivity for CO and NOx was not observed.
김진해,유권규,전춘배,김정규,박기철 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
Amonia gas sensitive ZnO:In thin films were prepared by In(100 Å)/ZnO(3000 Å) double layer deposition onto the Si-wafer substrate thermally grown with 1000 A SiO_(2) and the subsequent heat treatment process. Dependence of the sensitivity and selectivity of them on heat treatment temperature was investigated. The thin film heat-treated at 400 ℃ showed the highest sensitivity at an operating temperature of 300 ℃. The selectivity towards CO, NO_(x) gases was observed in the same temperature.
신정호,장재영,김정규,박기철 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
LaCrO_(3) thick film sensors were fabricated on an alumina substrate by screen printing method. The sensitivities for gases were investigated by varying the heat treatment temperatures of the films. The sensitivities of LaCrO_(3) thick film for Gallo and NH_(3) gases were better than for CO and NO gases. The best condition of heat treatment was 450℃ and the optimal operating temperature of LaCrO_(3) thick film for the highest sensitivity was 400℃. Sensitivities of LaCrO_(3) thick films about at 3000ppm for C_(4)H_(10) and NH_(3) gases were 85% and 95%, respectively.
R.F. Magnetron Sputtering법으로 제조한 LaCoO₃박막의 가스감지 특성
신정호,김정규,박기철,전춘배,장재영 慶尙大學校 工科大學 自動化및컴퓨터應用技術硏究所 1998 自動化 및 컴퓨터應用技術 Vol.5 No.1
LaCoO₃(LCO) thin film sensors were fabricated on an alumina substrate by r.f. magnetron sputtering. By varying the annealing temperature of the LCO film from 600℃ to 1000℃, we investigated X-ray diffraction pattern, electrical properties, and gas sensing properties of the films. The crystallinity was improved and the activation energy was increased with increasing the annealing temperature. The sensitivities of the LCO films for NH₃ and CO gases were also increased with the annealing temperature. Sensing properties of LCO thin films were improved when the measuring temperature was 350℃ or more
임종도,김진해,박종아,김권태,김정규,마대영,박기철 경상대학교 생산기술연구소 2001 工學硏究院論文集 Vol.1 No.-
The Pd(palladium) doped SnO2(Tin Oxide) thin films sensitive to NH3 gas were prepared on alumina substrate by rf magnetron sputtering method. The gas sensing characteristics of Pd doped SnO2 thin films were studied as a function of film thickness and heat-treatment temperature. The dependence of the sensitivity, the selectivity and the time response of the thin films on heat-treatment temperature, film thickness and gas species were investigated. The thin films of Pd doped SnO2 which were the Pd content of 5 wt%, the film thickness of 5000 ? and the heat-treatment temperature of 600 ℃ showed the highest sensitivity of 68 % for 100 ppm NH3 gas concentration under an operating temperature of 400 ℃. The sensitivity towards NOx gas was not observed in the same condition.
16MDRAM급 NMOS 트랜지스터의 전원전압, 채널길이와 기판농도
이희국,김정규 慶尙大學校生産技術硏究所 1991 生産技術硏究所論文集 Vol.7 No.-
The power supply voltage and the channel length of an NMOS transistor used for 16MDRAM have been investigated. The maximum effective channel length which does not degrade operating speed of an inverter greatly, is calculated for power supply voltages and the life time of the NMOS transistor also estimated in terms of power supply voltages and channel lengths. As results, short channel length and low power supply voltage are effective in the operating speed and the life time. Short channel effects are optimized experimentally by varying substrate doping concentrations. Minimum channel length of the transistor is achieved to be 0.8㎛ from the results of punchthrough voltages and the optimum p-well does to be 4.5E12cm² from the results of DIBL and snap-back voltages.
열처리된 ZnO:Al 투명 도전막의 전기적 및 광학적 특성
유권규,김진해,전춘배,김정규,박기철 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
The heat treatment effects of the undoped ZnO and Al doped ZnO(ZnO:Al or AZO) transparent conductive films prepared by rf magnetron sputtering were investigated. The variations of the electrical and optical properties with heat treatment temperature and ambient gas or conditions were studied. The resistivity of the undoped ZnO films, heat-treated in air, vacuum and H_(2) plasma for 1 hour, increased rapidly above 200 ℃ , 300 ℃ ,400 ℃ and 400 ℃, respectively. And the resistivity of the ZnO:Al films heat-treated in air also increased rapidly above 300℃ . On the other hand the resistivity of the ZnO:Al films heat-treated in vacuum and H_(2) plasma were observed constant resistivity regardless of heat treatment temperature. The optical transmittance above 550nm is about 90% for all films regardless of impurity doping, the heat treatment temperature and ambient gas or conditions.
R.F. magnetron sputtering법으로 제조한 LaCoO₃박막의 가스감지 특성
장재영,신정호,김정규,박기철,전춘배 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
LaCoO_(3)(LCO) thin film sensors were fabricated on an alumina substrate by the r.f. magnetron sputtering. By varying the annealing temperature of the LCO films from 600℃ to 1000℃, we investigated X-ray diffraction pattern, electrical properties, and gas sensing properties of the films. The crystallinity was improved and the activation energy was increased with increasing the annealing temperature. The sensitivity of the LCO films for NH_(3) and CO gases was also increased with the annealing temperature. Sensing properties of LCO thin films were improved when the measuring temperature was 350℃ or more.