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Mo¨ssbauer Spectrometer의 속도변환 장치의 제작
申榮男,朴成培,金在慶,裵錫喆 大邱大學校附設 基礎科學硏究所 1991 基礎科學硏究 Vol.8 No.-
A constant acceleration Mossbauer spectrometer is constructed and a reference signal of the desired waveform to drive the feedback system is produced by the multichannel scaling board and with the help of operational amplifier. The stability and the linearity of the system for a triangular velocity waveform is investigated in the measurement of Mossbauer spectra of standard sample(αFe, αFe₂O₃, stainless steel and Na₂[Fe(CN)_(5)NO]₂H₂O). The system is stabilized and the linearity of the system for triangular velocity waveform is better than ?0.01% for the half-period of 14mm/sec velocity.
터보 압축기 임펠러-디퓨저 유동장에 대한 정상상태 해석
남삼식(S. S. Nam),박일영(I. Y. Park),이성룡(S. R. Lee),주병수(B. S. Ju),황영수(Y. S. Hwang),인배석(B. S. In) 한국유체기계학회 2005 유체기계 연구개발 발표회 논문집 Vol.- No.-
Numerical and experimental investigations were conducted to assess the aerodynamic performance of several centrifugal compressors. In order to impose an appropriate physics at the interface between impeller and vaned diffuser numerically, two different techniques, frozen rotor and stage models, were applied and the simulation results were compared with the corresponding prototype test data. An equivalent sand-grain roughness height was utilized in the present computational study to consider a relative surface roughness effect on the stage performance simulated. From a series of investigations, it was found that the stage model is more suitable than the frozen rotor scheme for the steady interactions between impeller and diffuser in turbocompressor applications. It is supposed that the solution by frozen rotor scheme is inclined to overrate the non-uniformity of the flow fields. The predicted aerodynamic performance accounting for surface roughness effect shows favorable agreement with experimental data. Simulations based on the aerodynamically smooth surface assumption tend to overestimate the stage performance.
고위험 자궁경부암 제 I B , II A 및 II B기 환자에서 수술전 선행 항암요법의 효과
남궁성은(SE Namkoong),배석년(SN Bae),안웅식(WS An),박종섭(JS Park),김진우(JW Kim),한구택(GT Han),이준모(JM Lee),김승조(SJ Kim) 대한산부인과학회 1994 Obstetrics & Gynecology Science Vol.37 No.12
To evaluate the potential role of preoperative neoadjuvant Chemotherapy in Patients with cervical cancer, 92 patients with locally advanced cervical cancer stage IB, IIa and IIB who had completed 4years of follow-up(from January 1985 to December 1989) after treated with chemotherapy followed by radical hysterectomy and pelvic lymphnode dissection at the Division of Gynecologi Oncology, Catholic University Medical College Seuol, Korea were selected in this study. The treatmentregimen was consisted of cisplatin 80mg/m2, bleomycin 15mg/m2 and viblastin 4mg/m2 given as a course (3 weeks interval) of neoadjuvant chemotherapy. All patient were evaluated by clinical and histological response to chemotherapy. The overall clinical response rate was 82.6% (28.3% of complete response and 54.3% of partial response). The chemotherapeutic response was more favorable in squamous cell carcinomas (86.9%) than in adenocarcinomas(37.5% P=0.010) The response rate confirmed by surgical specimen was 15% including microscopic and no residual disease. Pelvic lymphnode metastasis were found in 17.4%(16/92) of the patients and all nodal metastasis were found among the patients who had a partial response or a stable disease, and olny one patient was found in those with a complete response (p=0.0001). All patients were passed 4 years follow-up and the 4 year tumor free survival rate in patients with complete response. partial response and stable disease were 96.2%(25/26), 88%(44/50), and 37.5%(6/16). The 4 year tumor free survival rate of high risk cervical cancer stage IB, IIA, and IIB were 87.9% (36/11), 83.4%(30/36) and 60%(9/15). This study suggest that preoperative adjuvant chemotherapy may be beneficial in reducing pelvic lymphnode metastasis, reducing recurrences and prolonging the survival of the patients with locally advanced high risk cervical cancer stage I and II.