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羅聲雄 충남대학교 공업교육연구소 1980 論文集 Vol.3 No.2
Charging mechanism in electrostatic printing was experimentally verified as a gas discharging. If the mechanism of the electrostatic charges deposited outo insulated printing paper is assumed to be the gas discharging, the relation between the breakdown voltage and the product of P and d follows the Paschen's law. This relation is obtained quantiratively by carrying out the experiment in a Bell jar, where two electrodes making a gap of sectoral shape are used in variable atmosphetic pressures. The results obtained from this experiment show that the charging occurs in the range where the interelectrode gap, d, has values of d_n & d_f. One may verify that the shorter distance d_n obtained from this experiment agrees very well with t hose of Paschen's law, but the larger distance d_f is rather hard to define because of the gradual change of the electrostatic charges. From this charging mechanism, one may conclude that a negative recording electrode is desirable to deposit a charge on the insulating paper because the secondary electrons from this electrode will accelerate the gas avalanche effect. Where a positive recording electrode is used, the insulating paper is found to have punctured holes(pin holes) due to the secondary electrons.
工業系 敎師 硏修敎育을 위한 電算敎育 프로그램의 改善에 관한 硏究
羅聲雄 충남대학교 공업교육연구소 1984 論文集 Vol.7 No.2
This study is intended to searching for improvements in the strategies and contents of computer education in In-Service Training Program for Technical Teachers. The responses of the computer education from the teachers who attended '84 sumner In-Service Training were carefully analized and the main conclusions are suggested as follwos ; 1) The computer education for technical teachers should be a education to get the capability to educate the students with computers and about computers. 2) It is desirable to educate teachers the contents of table 7 in the lecture of Computer Education and Computer Programming Ⅰ.Ⅱ.
최적 양자화를 위한 로이드-맥스 알고리즘의 초기값 설정에 관한 연구
나성웅 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.1
Lloyd-Max Algorihm is very simple to program into a digital computer, and it is adequate method for the design of 1-Dimensional minimum mean square error quantizer. But there are two problems associated with Max's scheme ; the initialization and the updating of the algorithm. These iteration schemes are extremely sensitive to initial conditions. In this paper, a straightforward approximation method of obtaining good initial conditions for 2 commom input density is presented.
나성웅,김선옥,황의창,오경진,정승일,강택원,권동득,박광성,류수방 대한비뇨의학회 2011 Investigative and Clinical Urology Vol.52 No.9
Purpose: We prospectively evaluated the surgical outcomes of single scrotal incision orchiopexy in children with a palpable undescended testis compared with the traditional two incision orchiopexy. Materials and Methods: A total of 398 orchiopexies (292 children) were included and randomly assigned to the single scrotal incision orchiopexy group (Group I, 147 children, 201 testes) or the traditional inguinal incision orchiopexy group (Group II, 145 children, 197 testes). The final number of patients enrolled (excluding those lost to follow-up) was 107 children (146 testes) in group I and 105 children (141 testes) in group II. Success was defined as no complications, postoperative intrascrotal location of the testis, and no conversion to the traditional inguinal approach. Surgical outcomes and complications were compared between the two groups. Testicular location, complications, and subjective satisfaction rate were assessed at the follow-up evaluation at least 12 months postoperatively. Results: The overall success rate in group I was 92.5% in 135 of 146 testes; the remaining 9 testes required conversion to traditional two incision orchiopexy. In group II, orchiopexy was successful in 136 of 141 testes (96.5%). The operation time and hospital stay were significantly shorter in group I (40.5±25.9 minutes, 2.1±0.8 days) than in group II (62.3±35.6 minutes, 2.5±0.7 days), respectively (p<0.001, p=0.03). Postoperative complications were found in two cases (hematoma, wound dehiscence) in group I and in one case (wound dehiscence) in group II; all cases with complications recovered with conservative care. The subjective rate of satisfaction with the cosmetic result was 96.6% in group I and 96.5% in group II (p=0.97). Conclusions: We conclude that single scrotal incision orchiopexy is a simple technique that is associated with a shorter operation time and hospital stay than the traditional method and that is more feasible cosmetically.
전립선 수술 술식에 따른 2세대 Cephalosporin계의 예방적 효과
나성웅,정승일,황의창,권동득,박광성,류수방 대한요로생식기감염학회 2011 Urogenital Tract Infection Vol.6 No.2
Purpose: There is no definitive standard concerning the use of prophylactic antibiotics for prostatic operations, except for transurethral resection of prostate (TUR-P). This study prospectively investigated the prophylactic effectiveness of a second generation cephalosporin according to prostatic operation method. Materials and Methods: From October 2010 to January 2011, prostatic operations were conducted for 67 patients: group I (radical prostatectomy, n=18), group II (TUR-P, n=38), group III (laser TUR-P, n=11) for 11: group III). Prophylactic antibiotics were intravenously administered beginning 1 hour preoperatively and orally with several days postoperatively. Prophylactic effectiveness was evaluated by comparison of urine analysis and presence of bacteriuria. Results: In group I, no patient had preoperative Foley catheter installation, and mean antibiotic prescription period pre- and post-operatively was 5.83 days and 6.94 days. Five group I patients (27.8%) displayed bacteriuria. In group II, 9 patients had preoperative Foley catheter installation and mean antibiotic prescription period was 3.76 days and 5.68 days, respectively. Five patients (13.2%) had postoperative bacteriuria; two in preoperative catheterized patients and three in preoperative non-catheterized patients. In group III, mean antibiotic prescription period was 1.73 days and 5.09 days, respectively. There was no postoperative bacteriuria. Conclusions: Prophylactic use of a second generation cephalosporin for prostatic operation, except laser TUR-P, was limited in preventing postoperative pyuria with bacteriuria. There was a tendency of higher occurrence of postoperative bacteriuria in patients with preoperative Foley catheter installation.