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양석준,김진우,신승우,이희진,신승훈,유동수,장석원 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.6
본 논문은 고압 커패시터의 고장분석과 신뢰성 예측 결과를 다루고 있다. 부품의 수명과 고장률을 예측하기 위해서 두 가지 방법으로 고장 모드와 고장 메커니즘을 연구하였다. 에폭시 수지로 성형된 고압 커패시터가 절연내압 시험 하에서 저항이 제로로 되는 고장에 대하여, 근본원인 고장분석 체계를 효과적으로 수립함으로써 고장 메커니즘의 원인을 분석하였다. 특히 세라믹-에폭시 계면에서의 절연파괴 고장 현상이 강조되었으며, 본 연구에서 얻어진 결과의 타당성은 마그네트론에 장착된 고압 커패시터의 열사이클 시험 수행에 의한 가속시험 결과로부터 입증되었다. 시험 결과들은 결함이 있는 로트를 신속히 규명하고 B10수명을 결정하는데 유용하게 사용할 수 있다. 또한, 유전체의 절연파괴에 대해서 부하-강도 간섭모델을 이용하여 고장률을 예측하였다. This paper presents a result of failure analysis and reliability evaluation for high voltage ceramic capacitors. The failure modes and failure mechanisms were studied in two ways in order to estimate component life and failure rate. The causes of failure mechanisms for zero resistance phenomena under withstanding voltage test in high voltage ceramic capacitors molded by epoxy resin were studied y establishing an effective root cause failure analysis. Particular emphasis was placed on breakdown phenomena at the ceramic-epoxy interface. The validity of the results in this study was confirmed by the results of accelerated testing. Thermal cycling test for high voltage ceramic capacitor mounted on a magnetron were implemented. Delamination between ceramic and epoxy, which might cause electrical short in underlying circuitry, can occur during curing or thermal cycle. The results can be conveniently used to quickly identify defective lots, determine B10 life estimation each lot at the level of inspection, and detect major changes in the vendors processes. Also, thd condition for dielectric breakdown was investigated for the estimation of failure rate with load-strength interference model.
양훈모,민영기,김동진,송호연,송윤섭 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2
Control of blood pressure is affected by regulation of intrarenal blood flow. Renal sympathetic nerve simulation inhibits pressure-depressor mechanism of kidney. This antidepressor mechanism was known as happening to due to a decrease the blood supply of renal medulla. It is not known whether renal sympathetic nerve innervation of renal medulla is and it affects regulation of medullary blood flow. We tried to measure total renal blood flow(TRBF), cortical blood flow(CBF), papillary blood flow(PBF) by ultrasonic and laser Doppler techniques in Wistar rats during 3 kinds of renal sympathetic nerves stimulation. The simulation orders are tried randomly and each stimulation period is 15 minute. TRBF and CBF decreased at 1 Hz by 2 and 2%, 3Hz by 18 and 15%, 5Hz by 49 and 44%, respectively as similar to each other. But PBF increased by 1% at 1 Hz and 4% at 3 Hz, while it decreased by 4% at 5 Hz. Therefore, it seems superficial renocortical and total renal blood flows are closely regulated by renal sympathetic nerves with increasing vasoconstriction at 5 Hz, onthe other hand while medullary blood flow seems to be under strong local control, tending to offset neurogenic flows restrictions.
5일 보존용 채혈백에 따른 보존일자별 농축혈소판의 생화학 및 성상 분석
이동범,유태종,김태전,김승곤,신종관,양대형,고광임,박성훈 임상병리검사과학회 2002 임상병리검사과학회지 Vol.34 No.2
Biochemical changes and icon of platelets on platelet concentrates preserved for a 5day term in several plastic containers were investigated. The authors evaluated the TOTM-PVC second generation container produced by Green Cross Medical Corp. and Boin medica. Blood obtained from 40 persons was manufactured for platelet concentrates within 4 hours and each divided into 20 units of platelet concentrations. Samples were taken at 0, 3, and 5days and the platelet count, pH, pO_(2), pCO_(2), HCO_(3)-, glucose, LDH, lactate, electrolytes, and mineral element were tested The number and MPV, for platelets icon, were well preserved on two different platelet concentrates during storage. A test for biochemical function appeared to be effective data. pH was maintained above 6.8 on two different platelet concentrates during storage. The results suggest that the TOTM-PVC second generation platelets storage container produced by Green Cross Medical Corp. and Boin medica was able to preserve platelets for at least five days without lesion and was it concluded to have biochemical efficacy on patients with transfusions.
생쥐모델에서의 망막모세포종 안구 자기공명분광법과 병리소견 : 초기경험
김동훈,김일중,양재한,김정훈,유영석,이봉재 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.1
Purpose: To show various MR spectroscopy and correlated pathologic images of retinoblastoma in nude mouse with a new human retinoblastom cell line (SNUOT-Rbl) which innoculated into intravitreous cavity. Materials and Methods: The established cell line was innoculated into mtravitreous cavity of 14 eyeballs of 7 mice and a transplanted retinoblastoma was examed for 1 month. Tl-weighted image (T1WI), T2-weihgted image (T2WI), and MR spectroscopy were obtained with 1.5 Tesla MRI (Magnetom Vision, Siemens, Erlangen, Germany) and 4.7 Tesla MRI (Bruker, Medizintechnik GmbH, Karlsruhe-Ettlingen, Germany). After scanning, eyeballs were extracted and hematoxylin & eosin stained specimens were examined with the microscope. We compared MR spectroscopy with pathologic findings and evaluated characters of tumors. Results: Innoculated cells into eyeball of mice grew retinoblastoma (8/14, 57%). Eyeball with retinoblastoma protruded externally and showed focal hemorrhage. Tumors showed low (n=3), iso (n=4), high (n=1) signal intensity on TIWI, low (n=5), iso (n=1), high (n=2) signal intensity on T2WI, and well enhancement (n=8) with contrast, Involvement of optic nerve was suspected by MRI and confirmed by pathology (n=1). Conclusion: We could demonstrate MR spectroscopy of transplanted retinoblastoma by new tumor cell line in vivo. This imaging technique facilitate molecular imaging investigation of retinoblastoma.
Norepinephrine에 의한 신자율 조절 변화의 Prostaglandin의 역활
배원경,양훈모,심동원 순천향대학교 1994 논문집 Vol.17 No.2
We investigated whether indomethacin, a prostaglandin (PG) synthesis inhibitor, modulates the effect of norepinephrine on the autoregulation of the renal blood flow(RBF) in anesthetized dogs. A silastic inflatable occluder was placed around the aorta cephalad to the bifurcation of thee renal artery, and an electromagnetic flow probe was placed around the renal artery for the measurement of RBF. RBF autoregulatory curves were determined during intravenous infusion of NE(0.3 & 0.8 ㎍/㎏/min) before and after the blockade of PG synthesis with indomethacin(1-2 ㎎/㎏). During control, we observed a precise autoregulation of RBF until RAP decreased to 69±3mmHg. The higher dose(0.8 ㎍/㎏/min) of NE shifted the curve to the right increasing the lower limit of RBF autoregulation to 79±5 mmHg while the lower dose had no effect on the curve. Inhibition of PG synthesis with indomethacin decreased RBF 8-10% during basal condition. However, the autoregulatory curves determind after the inhibition of PG synthesis were not significantly different from those determined before the inhibition. These data indicate that PG does not modulate the effect of norepinephrine on the autoregulation of RBF.
Lithium‐Sulfur Batteries: An Advanced Lithium‐Sulfur Battery (Adv. Funct. Mater. 8/2013)
Kim, Junghoon,Lee, Dong‐,Ju,Jung, Hun‐,Gi,Sun, Yang‐,Kook,Hassoun, Jusef,Scrosati, Bruno WILEY‐VCH Verlag 2013 Advanced functional materials Vol.23 No.8
<P>On page 1076, Yang‐Kook Sun, Jusef Hassoun, Bruno Scrosati, and co‐workers report and characterize a hard carbon spherules‐sulfur electrode that is prepared by impregnation of crystalline sulfur into the carbon spheres through melting and thermal treatment. This material demonstrates very high capacity and rate capability, and is therefore proposed as a new generation cathode to drive electric vehicles over a long range. </P>