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LC 공진형 PWM 인버터를 이용한 X선 발생장치의 특성에 관한 연구
이성길,박수강,임홍우,조금배,백형래,임양수 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.1
The conventional types of X-ray generators were bulky in physical size and heavy in weight, and the control accuracies of the output voltages were not always satisfactory. The high frequency switching inverter and converter technology on power conversion and control systems have been greatly closed up introducing power semiconductor devices. In this paper, the newly developed converter to take the balance of the output voltage versus the ground are also presented in detail to decreasing the volume and the weight of high voltage transformer and to stabilize ripple. This converter consists of the two independent L-C series resonant circuits using the two capacitances and the two primary windings of high voltage transformer.
이우선,조금배,장순석 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.1
We have been fabricated the high voltage TFT(HVTFT) having output voltage of l00V. The hysteresis curves occurred in the HVTFT. Hysteresis charactristics measured in the range of drain voltage of l00V, gate voltage of 100V. Drain current Id showed negative current characteristic a t high gate voltage. We found that the according to the forward voltage Vg increase, the drain current Id decreased. And the reverse voltage Vg decreased exponentially with the drain current Id. The hysteresis region occurred mare larger at high voltage. According to the Vd increase, Id (on/off) ratio decreased exponentially.
Moving wall 형 LB막 정전용량의 주파수 의존성
이우선,오금곤,정용호 조선대학교 에너지.자원신기술연구소 1998 에너지·자원신기술연구소 논문지 Vol.20 No.2
LB layers of L-α-DLPC deposited by LB method were deposited onto n-type silicon wafer as Z-type film. Films made up of 8, 16 layers of lipid with long alkyl chain and the thickness of monolayer and multilayers was determined by ellipsometry. It was deposited Ag and Al onto LB layers and silicon wafer for electrode and exhibit high capacitance with low frequency. The MLS capacitor shows very high value of capacitance. The result indicated the lower leakage current and very high saturation value of capacitance was reached within 700-800 ㎊ when the thickness was 275Å.
李金洙,鄭鉉雨,康成溶 대한본초학회 2000 大韓本草學會誌 Vol.15 No.2
Acori Graminei Rhizoma(AGR) has been used in Korea for many centuries as a therapeutic agent for cerebral disease. The effect of AGR on the vascular system is not known. The purpose of this study was to determine the effect of AGR on the pial arterial diameter of male Sprague-Dawely rats. The changes in pial arterial diameter were determinated by video microscopy methods and video analyzer. The results were as follows ; 1. Pial arterial diameter was increased by AGR in a dose-dependent manner. 2. Pretreatment with 1H[1,2,4]oxadizolo[4,3-a]quinoxalin-1-one(ODQ, 3μM, i.v.) significantly inhibited AGR induced increased pial arterial diameter. 3. Pretreatment with N^G-nitro-L-argirinine(-NNA, 1㎎/㎏, iv) significantly inhibited AGR induced increased pial arterial diameter. These results suggest that AGR causes a diverse response of pial arterial diameter. The increased in pial arterial diameter is also mediated by nitric oxide synthase and cyclic GMP(guanylyl cyclase).
위내시경에서 육안적 이상 없이 진단된 저위도 점막연관림프조직형 위림프종 2예
이상협,송인성,정현채,김철우,김정룡,김주성,이진혁,우열근,예병덕,곽금연,이종열,이준규 대한소화기학회 2001 대한소화기학회지 Vol.37 No.1
Low-grade gastric mucosa associated lymphoid tissue (MALT) lymphoma has a broad spectrum of endoscopic presentations, which ranges from diffuse erosion to ulcerative mass. The bland appearance of this disease in some patients may reflect the early stage of the disease. We report 2 cases of low-grade gastric MALT lymphoma in which the endoscopic presentation consisted with normal appearing mucosa of the stomach. The patients were successfully treated with anti-Helicobacter pylori therapy. Endoscopy is useful to diagnose and follow up low-grade gastric MALT lymphoma. However, in the early stages of the disease, the histologic evaluation of biopsy specimens obtained from all gastric areas can be the more reliable diagnostic procedure to detect this neoplasm.
Anti-inflammatory and Anti-allergic Effects of Lycii Fructus Extract
Lee Young-Sun,Lee Geum-Hong,Kwon Young-Kyu,Lee In-Kyung,Xue Charlie-C.L.,Li Chun-G,Lee Se-Young,Shin Sang-Woo The Physiological Society of Korean Medicine 2005 동의생리병리학회지 Vol.19 No.5
Lycii Fructus (LF) has been reported to possess various biological activities. In this study, we investigated the anti-inflammatory and anti-allergic effects of LF extract in lipopolysaccharide (LPS)-stimulated RAW 264.7 macrophage cells and rat peritoneal mast cells(RPMC). LF extract inhibited NO production and the expressions of inducible NO synthase (iNOS) mRNA and enzyme protein, determined by Griess reactions, RT-PCR and Western blotting, respectively, in LPS-stimulated RAW 264.7 macrophages cells. LF extract significantly inhibited histamine release in compound48/80 stimulated rat peritoneal mast cells compared with the compound48/80 only treated cells. It is suggested that the LF extract can improve the inflammation status that involves the histamine release.